Solar photovoltaic module

Abstract

The present application relates to the technical field of solar photovoltaic module manufacturing, and provides a solar photovoltaic module. The solar photovoltaic module comprises a plurality of cell strings; each cell string comprises a plurality of cell pieces of which edges are sequentially stacked and which are electrically connected; the cell pieces are obtained by cutting an entire cell; and in an extension direction of the cell string, for two adjacent cell pieces, a non-cutting edge of a preceding cell piece is located above a cutting edge of a subsequent cell piece, and the non-cutting edge of the preceding cell piece is located at a light receiving side of the photovoltaic module. The photovoltaic module having a specific structure can effectively improve the power generation efficiency of the photovoltaic module, and also has advantages such as a short research and development period and low research and development costs.

Description

A solar photovoltaic module

[0001] Cross-reference to Related Applications

[0002] The present application claims priority to the Chinese patent application No. 2024215755111, filed on July 04, 2024, and entitled "A solar photovoltaic module", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the technical field of solar photovoltaic module manufacturing, in particular to a solar photovoltaic module. BACKGROUND

[0004] In the prior art, the cell string in a solar photovoltaic module (for example, a shingle photovoltaic module) is usually obtained by sequentially stacking a plurality of cell pieces, wherein the cell pieces are usually obtained by cutting a whole cell sheet. At present, with the needs of technological development, people urgently hope to improve the power generation efficiency of photovoltaic modules. Common improvement measures are generally to optimize the circuit structure of the photovoltaic module (for example, to adjust the series-parallel relationship between cell strings) or to optimize the structure of the cell sheet. These improvement measures can improve the power generation efficiency of the photovoltaic module to a certain extent, but the improvement of the power generation efficiency is limited, and there are problems such as long research and development cycle and high research and development cost.

[0005] SUMMARY

[0006] The purpose of the present application is to provide a solar photovoltaic module that can effectively improve the power generation efficiency of the photovoltaic module, and has the advantages of short research and development cycle and low research and development cost.

[0007] Embodiments of the present application are implemented as follows:

[0008] The present application provides a solar photovoltaic module, which includes a plurality of cell strings, each cell string includes a plurality of cell pieces that are sequentially stacked and electrically connected in edge-to-edge manner, the cell pieces are obtained by cutting a whole cell sheet, and in the extension direction of the cell string, for two adjacent cell pieces, the non-cutting edge of the former cell piece is located above the cutting edge of the latter cell piece, and the non-cutting edge of the former cell piece is located on the light-receiving side of the photovoltaic module.

[0009] In the technical solution, for two adjacent battery pieces in the extension direction of the battery string, the non-cutting edge of the former battery piece is arranged above the cutting edge of the latter battery piece, and the non-cutting edge is arranged on the light-receiving side of the photovoltaic module. In this specific stacking mode, the cutting edge with low solar utilization rate can be hidden on the back of the photovoltaic module, thereby reducing the adverse effect of the cutting edge on the power generation efficiency of the photovoltaic module to a certain extent, and improving the power generation efficiency of the photovoltaic module. Meanwhile, the solar photovoltaic module has the advantages of short research and development period and low research and development cost, because the structure of the battery piece and the circuit structure of the photovoltaic module do not need to be adjusted.

[0010] In some optional embodiments, in a single battery string, each of the plurality of battery pieces has one cutting edge and one non-cutting edge. In the extension direction of the battery string, for any two adjacent battery pieces, the non-cutting edge of the former battery piece is above the cutting edge of the latter battery piece.

[0011] In the technical solution, each of the plurality of battery pieces in the same battery string has one cutting edge and one opposite non-cutting edge, that is, each of the plurality of battery pieces comes from a specific cutting mode of one of two. On this basis, for any two adjacent battery pieces, the non-cutting edge of the former battery piece is arranged above the cutting edge of the latter battery piece, so that the cutting edges of all battery pieces in the entire photovoltaic module (except the first piece) are located on the back of the photovoltaic module, that is, the non-cutting edges of all battery pieces participate in solar photovoltaic power generation, so that the photovoltaic module has high power generation efficiency.

[0012] In some optional embodiments, in a single battery string, each of the plurality of battery pieces has one cutting edge and one non-cutting edge. In the extension direction of the battery string, at least one of the first piece and the tail piece of the battery string has one cutting edge and one non-cutting edge.

[0013] In the technical solution, each of the plurality of battery pieces in the same battery string has one cutting edge and two cutting edges, that is, each of the plurality of battery pieces comes from a cutting mode of one of three, one of four or one of five. For these specific cutting modes, in the same battery piece, in addition to the battery piece cut from both ends of the whole piece having one cutting edge and one non-cutting edge, the battery piece cut from the remaining positions has two cutting edges and no non-cutting edge. On this basis, in the extension direction of the battery string, the first piece and the tail piece of the battery string are arranged to have at least one cutting edge and one non-cutting edge, which can reduce the number of cutting edges on the light-receiving side of the photovoltaic module, thereby effectively improving the power generation efficiency of the photovoltaic module.

[0014] In some alternative embodiments, the first piece and the tail piece of the battery string each have one cutting edge and one non-cutting edge in the extension direction of the battery string.

[0015] In the technical solution, based on the battery piece material obtained by the cutting method of every three, every four or every five, the first piece and the tail piece of the battery string are set to have one cutting edge and one non-cutting edge in the extension direction of the battery string, that is, the battery pieces with two cutting edges and no non-cutting edge are arranged in the internal region of the corresponding battery string, which can further reduce the number of cutting edges on the light-receiving side of the photovoltaic module, thereby more effectively improving the power generation efficiency of the photovoltaic module.

[0016] In some alternative embodiments, each battery string includes a plurality of battery piece units sequentially and layerwisely distributed and electrically connected edges, and each battery piece unit includes N battery pieces sequentially and layerwisely distributed and electrically connected edges, wherein N is a positive integer greater than or equal to 3, the first piece and the tail piece of at least part of the battery piece units each have one cutting edge and one non-cutting edge, and the N-2 battery pieces between the first piece and the tail piece each have two cutting edges.

[0017] In the technical solution, generally, when there is no battery piece cutting loss problem (that is, all battery pieces cut from a whole battery piece can be normally used), a plurality of battery pieces cut from a whole battery piece are combined to form a battery piece unit, and the number of battery pieces in each battery piece unit corresponds to the cutting method (for example, when the cutting method is every N, the number of battery pieces in each battery piece unit is N), and the battery string is obtained by sequentially and layerwisely arranging a plurality of battery piece units. On this basis, for the battery piece material with the cutting method of every N, part of the battery piece units are set to have the specific form that the first piece and the tail piece each have one cutting edge, and the N-2 battery pieces in the middle each have two cutting edges and no non-cutting edge, which can reduce the number of cutting edges on the light-receiving side of the photovoltaic module, thereby more effectively improving the power generation efficiency of the photovoltaic module.

[0018] In some alternative embodiments, each battery piece unit includes three battery pieces sequentially and layerwisely distributed and electrically connected edges, and the first piece and the tail piece of at least part of the battery piece units each have one cutting edge and one non-cutting edge, and the battery piece between the first piece and the tail piece has two cutting edges.

[0019] In the technical solution, the incoming material of the battery piece is cut into three pieces, and the first piece and the tail piece of each battery piece unit have one cutting edge and one non-cutting edge, and the battery piece between the first piece and the tail piece has two cutting edges and no non-cutting edge. The number of cutting edges on the light-receiving side of the photovoltaic module is reduced, thereby effectively improving the power generation efficiency of the photovoltaic module.

[0020] In some optional embodiments, in each battery piece unit, the first piece and the tail piece have one cutting edge and one non-cutting edge, and the battery piece between the first piece and the tail piece has two cutting edges.

[0021] In the technical solution, the incoming material of the battery piece is cut into three pieces, and the first piece and the tail piece of each battery piece unit have one cutting edge and one non-cutting edge, and the battery piece between the first piece and the tail piece has two cutting edges and no non-cutting edge. The number of cutting edges on the light-receiving side of the photovoltaic module is reduced, thereby effectively improving the power generation efficiency of the photovoltaic module.

[0022] In some optional embodiments, the type of the solar photovoltaic module is a single-glass module or a double-glass module.

[0023] In the technical solution, the specific applicable types of the solar photovoltaic module are more, which can provide more implementable solutions, thereby facilitating the popularization and application of the technical solutions provided by the embodiments of the application.

[0024] In some optional embodiments, in each battery string, in the extension direction of the battery string, the size of the overlapping area of any two adjacent battery pieces is 0.1-1 mm.

[0025] In the technical solution, the overlapping area of any two adjacent battery pieces is limited within a specific range, which can better balance the manufacturing cost and the power generation efficiency (generally, the smaller the overlapping area, the higher the manufacturing cost, but if the overlapping area is too large, the light-receiving area is reduced, which will lead to a decrease in power generation efficiency).

[0026] In some optional embodiments, in the extension direction of the battery string, any two adjacent battery pieces are electrically connected by a welding strip; in the extension direction of the battery string, the welding strip includes an overlapping area welding strip located in the overlapping area and a non-overlapping area welding strip located outside the overlapping area, the thickness of the overlapping area welding strip is less than that of the non-overlapping area welding strip, and the width of the overlapping area welding strip is greater than that of the non-overlapping area welding strip.

[0027] In the technical solution, any two adjacent battery pieces are electrically connected by the welding strip, which has the advantages of firm connection, good electrical conductivity and convenient industrial manufacturing. In addition, the thickness of the overlapping area welding strip is set to be less than the thickness of the non-overlapping area welding strip, and the width of the overlapping area welding strip is set to be greater than the width of the non-overlapping area welding strip, that is, the overlapping area welding strip is thinned and widened, which helps to improve the electrical conductivity and also improves the mechanical strength after connection. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the specific embodiments or prior art of the present application, the drawings needed in the description of the specific embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0029] Fig. 1 is a schematic diagram of the distribution of a plurality of battery strings in a solar photovoltaic module according to an embodiment of the present application;

[0030] Fig. 2 is a schematic diagram of a first structure of a single battery string according to an embodiment of the present application;

[0031] Fig. 3 is a partial enlarged view of A in Fig. 2;

[0032] Fig. 4 is a schematic diagram of a single-glass module according to an embodiment of the present application;

[0033] Fig. 5 is a schematic diagram of a second structure of a single battery string according to an embodiment of the present application;

[0034] Fig. 6 is a schematic diagram of a third structure of a single battery string according to an embodiment of the present application;

[0035] Fig. 7 is a schematic diagram of a fourth structure of a single battery string according to an embodiment of the present application;

[0036] Fig. 8 is a schematic diagram of a structure in which two adjacent battery pieces are connected by a welding strip according to an embodiment of the present application.

[0037] Fig. 1 is a schematic diagram of the distribution of a plurality of battery strings in a solar photovoltaic module according to an embodiment of the present application; DETAILED DESCRIPTION

[0038] 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 only some of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0039] 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 application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts fall within the scope of the present application.

[0040] It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0041] In the description of the present application, it should be noted that the terms "upper", "lower", "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 in which the product of the present application is usually placed, 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.

[0042] In the description of the present application, it should also be noted that, unless otherwise explicitly specified and limited, the terms "arranged", "mounted", "connected", "linked" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, or can be connected inside two elements. 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.

[0043] Since the existing improvement measures to improve the power generation efficiency of photovoltaic modules all have certain defects, the inventors have found that the cell pieces are usually obtained by cutting, and accordingly, each cell piece has at least one cutting edge, which makes a large number of cutting edges exist in the solar photovoltaic module at the same time. However, the cutting edges are difficult to effectively utilize solar energy for power generation due to damage, and if the adverse effects of the existence of the cutting edges on the power generation efficiency can be reduced as much as possible, the power generation efficiency of the photovoltaic module can be improved without adjusting the structure of the cell piece itself and the circuit structure of the photovoltaic module, and at the same time, has the advantages of short research and development period and low research and development cost.

[0044] The following will specifically describe a solar photovoltaic module of the present application.

[0045] Referring to FIGS. 1-3, the embodiment of the present application provides a solar photovoltaic module 10, which includes a plurality of cell strings 100, each of which includes a plurality of cell pieces 110 that are sequentially and electrically connected in edge-stacked distribution, the cell pieces 110 being obtained by cutting a cell sheet, and in the extension direction a of the cell string, for two adjacent cell pieces 110, the non-cutting edge 111 of the former cell piece 110 is located above the cutting edge 112 of the latter cell piece 110, and the non-cutting edge 111 of the former cell piece 110 is located on the light-receiving side of the photovoltaic module. At the same time, since the structure of the cell sheet and the circuit structure of the photovoltaic module do not need to be adjusted, the solar photovoltaic module 10 of this structure also has the advantages of short research and development cycle and low research and development cost.

[0046] In order to better understand the technical solutions, the meanings of the cutting edge and the non-cutting edge are supplemented here.

[0047] Taking lossless cutting as an example, the general process is as follows: a laser beam is irradiated on the cell sheet, so that the irradiated area is melted and rapidly cooled, achieving the effect of cutting, thereby obtaining a plurality of cut cell pieces 110. The cutting edge 112 refers to the side that is damaged after the cell sheet directly contacts the laser beam during the cutting of the cell sheet as a whole. Correspondingly, the non-cutting edge 111 refers to the side that does not directly contact the laser beam, which generally refers to the side edges corresponding to the two ends of the cell sheet as a whole.

[0048] In the present application, in the extension direction a of the cell string, for two adjacent cell pieces 110, the non-cutting edge 111 of the former cell piece 110 is arranged above the cutting edge 112 of the latter cell piece 110, and the non-cutting edge 111 is arranged on the light-receiving side of the photovoltaic module. According to this specific stacking mode, the cutting edge 112 with low solar utilization rate can be hidden on the back of the photovoltaic module, thereby reducing the adverse effects of the existence of the cutting edge 112 on the power generation efficiency of the photovoltaic module to some extent, and further improving the power generation efficiency of the photovoltaic module.

[0049] It should be noted that the specific type of the solar photovoltaic module 10 is not limited, for example, it can be a single-glass module, a double-glass module, or a flexible photovoltaic module. In other words, there are many specific applicable types of the solar photovoltaic module 10, which can provide many implementable schemes, thereby facilitating the popularization and application of the technical solutions provided by the embodiment of the present application. The embodiment of the present application takes the single-glass module as an example.

[0050] In order to better understand the technical solutions, the structure of the single-glass module is supplemented here.

[0051] Referring to FIG. 4, as an example, the solar photovoltaic module 10 includes a back plate 11, a back adhesive film 12, a power generation unit 13, a front adhesive film 14, and a glass 15 which are sequentially stacked and distributed, wherein the power generation unit 13 is formed by a plurality of cell strings 100 combined in series and / or in parallel, and the light receiving side of the solar photovoltaic module 10 is the glass 15 side.

[0052] It should be noted that the specific connection mode between the plurality of cell strings 100 is not limited and can be adaptively adjusted according to actual needs.

[0053] It should be noted that the type of cell sheet is not limited, for example, it can be TOPCon, HJT, BC or PERC.

[0054] It should be noted that since there are many slicing methods for cell sheets, such as all two, all three, all four, and all five, etc., the size and shape of the cell pieces 110 obtained by different slicing methods also differ slightly. Considering the power generation efficiency after lamination, the classification can be explained. Specifically, according to the number of cutting edges 112 and non-cutting edges 111 of the cell pieces 110 after slicing, it can be divided into all two and non-all two.

[0055] Referring to FIG. 5, as an example, in a single cell string 100, the plurality of cell pieces 110 each have one cutting edge 112 and one non-cutting edge 111. In the extension direction a of the cell string, for any two adjacent cell pieces 110, the non-cutting edge 111 of the former cell piece 110 is located above the cutting edge 112 of the latter cell piece 110.

[0056] In this embodiment, the plurality of cell pieces 110 in the same cell string 100 each have one cutting edge 112 and one opposite non-cutting edge 111, that is, the plurality of cell pieces 110 each come from a specific slicing method of all two. On this basis, for any two adjacent cell pieces 110, the non-cutting edge 111 of the former cell piece 110 is arranged above the cutting edge 112 of the latter cell piece 110, so that the cutting edges 112 of all cell pieces 110 in the entire photovoltaic module (except the first piece) are located on the back of the photovoltaic module, that is, all the non-cutting edges 111 of the cell pieces 110 participating in solar photovoltaic power generation, so that the corresponding photovoltaic module has a higher power generation efficiency.

[0057] Referring to FIG. 6, as an example, in a single cell string 100, the cell piece 110 has one cutting edge 112 and one non-cutting edge 111 or the cell piece 110 has two cutting edges 112. In the extension direction a of the cell string, at least one of the first piece and the tail piece of the cell string 100 has one cutting edge 112 and one non-cutting edge 111.

[0058] It should be noted that "the battery piece 110 has one cutting edge 112 and one non-cutting edge 111" and "the battery piece 110 has two cutting edges 112 and no non-cutting edge" represent two different forms of the battery piece 110 after cutting of the battery piece, and in more than two cutting forms, the battery piece 110 exists in both forms at the same time.

[0059] In this embodiment, the plurality of battery pieces 110 in the same battery string 100 have two different forms of one cutting edge 112 and two cutting edges 112, i.e. the corresponding plurality of battery pieces 110 come from a three-cut, a four-cut or a five-cut, etc. For these specific cutting methods, in the same whole battery piece, in addition to the battery piece 110 cut from both ends of the whole piece having one cutting edge 112 and one non-cutting edge 111, the battery piece 110 cut from the remaining positions has two cutting edges 112 and no non-cutting edge 111. On this basis, in the extension direction a of the battery string, at least one of the head piece and the tail piece of the battery string 100 is set to have one cutting edge 112 and one non-cutting edge 111, which can reduce the number of cutting edges 112 located on the light-receiving side of the photovoltaic module, thereby more effectively improving the power generation efficiency of the photovoltaic module.

[0060] Referring to FIG. 6, as an example, in the extension direction a of the battery string, the head piece and the tail piece of the battery string 100 both have one cutting edge 112 and one non-cutting edge 111.

[0061] In this embodiment, based on the battery piece 110 obtained from a three-cut, a four-cut or a five-cut, etc., in the extension direction a of the battery string, the head piece and the tail piece of the battery string 100 are both set to have one cutting edge 112 and one non-cutting edge 111, i.e. the battery piece 110 having two cutting edges 112 and no non-cutting edge 111 is arranged in the corresponding internal region of the battery string 100, which can further reduce the number of cutting edges 112 located on the light-receiving side of the photovoltaic module, thereby more effectively improving the power generation efficiency of the photovoltaic module.

[0062] It should be noted that, generally, when there is no problem of battery piece cutting (i.e. all battery pieces 110 cut from a whole battery piece can be normally used), N battery pieces 110 cut from the same whole battery piece will be combined into a battery piece unit, and the number of battery pieces 110 in each battery piece unit corresponds to the cutting method (for example, when the cutting method is cutting every N, the number of battery pieces 110 in each battery piece unit is N), and then the edges of multiple battery piece units are sequentially stacked to obtain the battery string 100, wherein the specific number of battery piece units is not limited and can be adjusted according to the length of the battery string 100.

[0063] As an example, each battery string 100 includes a plurality of battery piece units sequentially stacked and electrically connected at the edges, and each battery piece unit includes N battery pieces 110 sequentially stacked and electrically connected at the edges, wherein N is a positive integer greater than or equal to 3, and at least part of the battery piece units have a first piece and a tail piece each having one cutting edge 112 and one non-cutting edge 111, and N-2 battery pieces 110 between the first piece and the tail piece each have two cutting edges 112.

[0064] In this embodiment, the cutting method of the incoming battery piece 110 is cutting every N, and part of the battery piece units are set to have a first piece and a tail piece each having one cutting edge 112 and one non-cutting edge 111, and N-2 battery pieces 110 in the middle each have two cutting edges 112 without a non-cutting edge 111, which can reduce the number of cutting edges on the light-receiving side of the photovoltaic module, thereby effectively improving the power generation efficiency of the photovoltaic module.

[0065] Referring to FIG. 7, as an example, each battery piece unit (not shown in the figure) includes three battery pieces 110 sequentially stacked and electrically connected at the edges, and at least part of the battery piece units have a first piece and a tail piece each having one cutting edge 112 and one non-cutting edge 111, and the battery pieces 110 between the first piece and the tail piece each have two cutting edges 112.

[0066] It should be noted that, "at least part of the battery piece units have a first piece and a tail piece each having one cutting edge 112 and one non-cutting edge 111, and the battery pieces 110 between the first piece and the tail piece each have two cutting edges 112", which takes into account the extreme problem of battery piece cutting that may occur during cutting, so that it cannot be guaranteed that the three battery pieces 110 in each battery piece unit come from the same whole battery piece.

[0067] In this embodiment, the cutting mode of the battery piece 110 is every three, and the partial battery piece units are arranged in a specific form in which the first piece and the tail piece each have one cutting edge 112 and one non-cutting edge 111, and the battery piece 110 located in the middle has two cutting edges 112 and no non-cutting edge 111, so as to reduce the number of cutting edges 112 located on the light-receiving side of the photovoltaic module, thereby effectively improving the power generation efficiency of the photovoltaic module.

[0068] Referring to FIG. 7, as an example, in each battery piece unit, the first piece and the tail piece each have one cutting edge 112 and one non-cutting edge 111, and the battery piece 110 located between the first piece and the tail piece has two cutting edges 112.

[0069] It should be noted that, in the ideal state in which there is no battery piece cutting loss during cutting, the three battery pieces 110 in each battery piece unit are from the same battery piece, so that each battery piece unit has the first piece and the tail piece each having one cutting edge 112 and one non-cutting edge 111, and the battery piece 110 located between the first piece and the tail piece has two cutting edges 112.

[0070] In this embodiment, the cutting mode of the battery piece 110 is every three, and all the battery piece units are arranged in a specific form in which the first piece and the tail piece each have one cutting edge 112 and one non-cutting edge 111, and the battery piece 110 located in the middle has two cutting edges 112 and no non-cutting edge 111, so as to further reduce the number of cutting edges 112 located on the light-receiving side of the photovoltaic module, thereby more effectively improving the power generation efficiency of the photovoltaic module.

[0071] In the cutting mode of every four, compared with every three, the battery piece 110 located between the first piece and the tail piece in each battery piece unit has two cutting edges 112 and no non-cutting edge 111, and the number of the battery piece 110 is changed from one to two.

[0072] In the cutting mode of every five, compared with every three, the battery piece 110 located between the first piece and the tail piece in each battery piece unit has two cutting edges 112 and no non-cutting edge 111, and the number of the battery piece 110 is changed from one to three.

[0073] It should be noted that, in the extension direction a of the battery string, the size of the overlapping area between the adjacent two battery pieces 110 is not limited, and can be adjusted according to actual needs.

[0074] As an example, in each battery string 100, the size of the overlapping region of any two adjacent battery pieces 110 in the extension direction a of the battery string is 0.1-1 mm, for example but not limited to any one of 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm and 1 mm or a range value between any two of them.

[0075] In this embodiment, the overlapping region of any two adjacent battery pieces 110 is limited within a certain range, which can better balance the manufacturing cost and power generation efficiency (generally, the smaller the overlapping region, the higher the manufacturing cost, but if the overlapping region is too large, the light receiving area will decrease, which will lead to a decrease in power generation efficiency).

[0076] It should be noted that the electrical connection between the two adjacent battery pieces 110 in the extension direction a of the battery string is not limited, for example, it can be a solder strip 120 connection or a conductive adhesive connection.

[0077] Referring to FIG. 8, as an example, in the extension direction a of the battery string, any two adjacent battery pieces 110 are electrically connected by a solder strip 120.

[0078] In this embodiment, any two adjacent battery pieces 110 are electrically connected by a solder strip 120, which has the advantages of firm connection, good electrical conductivity and easy industrial manufacturing.

[0079] It should be noted that the solder strip 120 corresponding to the overlapping region and the solder strip 120 of the non-overlapping region can be integrally formed (for example, a complete round wire solder strip 120), or the solder strip 120 corresponding to the overlapping region can be adjusted according to specific needs.

[0080] Referring to FIG. 8, as an example, in the extension direction a of the battery string, the solder strip 120 includes an overlapping region solder strip 121 located in the overlapping region and a non-overlapping region solder strip 122 located outside the overlapping region, the thickness of the overlapping region solder strip 121 is less than the thickness of the non-overlapping region solder strip 122, and the width of the overlapping region solder strip 121 is greater than the width of the non-overlapping region solder strip 122.

[0081] In this embodiment, the thickness of the overlapping region solder strip 121 is set to be less than the thickness of the non-overlapping region solder strip 122, and the width of the overlapping region solder strip 121 is set to be greater than the width of the non-overlapping region solder strip 122, that is, the overlapping region solder strip 121 is thinned and widened, which helps to improve the electrical conductivity, and at the same time, the mechanical strength after connection is also improved.

[0082] It should be noted that the specific size, material and shape of the solder strip 120 corresponding to each region are not limited and can be adjusted according to actual needs.

[0083] As an example, the thickness of the overlap zone solder strip 121 is 70-110 μm, for example but not limited to any one of the point values of 70 μm, 80 μm, 90 μm, 100 μm and 110 μm or a range value between any two of them.

[0084] As an example, the non-overlap zone solder strip 122 is a round wire solder strip 120, and the diameter of the non-overlap zone solder strip 122 is 0.18-0.22 mm, for example but not limited to any one of the point values of 0.18 mm, 0.19 mm, 0.20 mm, 0.21 mm and 0.22 mm or a range value between any two of them.

[0085] It should be noted that the structure or function units not particularly mentioned or limited in the solar photovoltaic module 10 can be set according to the conventional selection in the art.

[0086] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application 。

Claims

1. A solar photovoltaic module, characterized by, The solar photovoltaic module comprises a plurality of battery strings, each of which comprises a plurality of battery pieces arranged in sequence and stacked by edges and electrically connected, the battery pieces being obtained by cutting a whole battery sheet, and in the extension direction of the battery string, for any two adjacent battery pieces, the non-cutting edge of the former battery piece is located above the cutting edge of the latter battery piece, and the non-cutting edge of the former battery piece is located on the light-receiving side of the photovoltaic module. In a single battery string, each of the plurality of battery pieces has one cutting edge and one non-cutting edge, and in the extension direction of the battery string, for any two adjacent battery pieces, the non-cutting edge of the former battery piece is located above the cutting edge of the latter battery piece.

2. The solar photovoltaic module of claim 1, wherein, In a single battery string, each of the plurality of battery pieces has one cutting edge and one non-cutting edge, and in the extension direction of the battery string, for any two adjacent battery pieces, the non-cutting edge of the former battery piece is located above the cutting edge of the latter battery piece.

3. The solar photovoltaic module of claim 1, wherein, In a single battery string, each of the plurality of battery pieces has one cutting edge and one non-cutting edge, and in the extension direction of the battery string, for any two adjacent battery pieces, the non-cutting edge of the former battery piece is located above the cutting edge of the latter battery piece.

4. The solar photovoltaic module of claim 3, wherein, In a single battery string, each of the plurality of battery pieces has one cutting edge and one non-cutting edge, and in the extension direction of the battery string, for any two adjacent battery pieces, the non-cutting edge of the former battery piece is located above the cutting edge of the latter battery piece.

5. The solar photovoltaic module of claim 4, wherein, In a single battery string, each of the plurality of battery pieces has one cutting edge and one non-cutting edge, and in the extension direction of the battery string, for any two adjacent battery pieces, the non-cutting edge of the former battery piece is located above the cutting edge of the latter battery piece.

6. The solar photovoltaic module of claim 5, wherein, In a single battery string, each of the plurality of battery pieces has one cutting edge and one non-cutting edge, and in the extension direction of the battery string, for any two adjacent battery pieces, the non-cutting edge of the former battery piece is located above the cutting edge of the latter battery piece.

7. The solar photovoltaic module of claim 6, wherein, The solar photovoltaic module is a single-glass module or a double-glass module.

8. The solar photovoltaic module according to any one of claims 1 to 7, characterized in that, In each battery string, the size of the overlapping area of any two adjacent battery pieces in the extension direction of the battery string is 0.1-1 mm.

9. The solar photovoltaic module according to any one of claims 1 to 7, characterized in that, In the extension direction of the battery string, any two adjacent battery pieces are electrically connected by a welding strip; and in the extension direction of the battery string, the welding strip comprises an overlapping area welding strip located in the overlapping area and a non-overlapping area welding strip located outside the overlapping area, the thickness of the overlapping area welding strip is smaller than that of the non-overlapping area welding strip, and the width of the overlapping area welding strip is greater than that of the non-overlapping area welding strip.

10. The solar photovoltaic module according to any one of claims 1 to 7, characterized in that, ​

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