Connecting structure, photovoltaic module and photovoltaic system

Abstract

The invention provides a connecting structure, a photovoltaic module and a photovoltaic system. The photovoltaic module comprises a battery string, a first welding strip, a second welding strip and a bus bar, the first welding strip and the second welding strip are arranged on a battery piece, the connecting structure is arranged on one side, deviating from the battery piece, of the first welding strip and the second welding strip, and the bus bar is arranged on one side, deviating from the first welding strip and the second welding strip, of the connecting structure; the connecting structure comprises a plurality of insulating parts and a plurality of conductive parts, the insulating parts separate two adjacent conductive parts, the conductive parts are arranged corresponding to the first welding strip, the insulating parts are arranged corresponding to the second welding strip, the conductive parts are used for electrically conducting the first welding strip and the bus bar, and the insulating parts are used for insulating the second welding strip and the bus bar. Therefore, the bus bar can be conductively connected with the first welding strip through the connecting structure, and the bus bar can be insulated from the second welding strip through the connecting structure at the same time, so that an isolating strip with a relatively large thickness does not need to be additionally arranged between the bus bar and the welding strip, and the risks of hidden breakage and cracking of a battery piece in the lamination process are reduced.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to a connection structure, a photovoltaic component and a photovoltaic system. Background Art

[0002] In the production process of photovoltaic modules, with the application of back-contact battery technology, in order to improve the power generation efficiency and aesthetics of a single module, the busbars are hidden on the backlight side of the cell. When setting the busbars, the related technology needs to set a spacer between the busbars and the cell, but the thickness of the spacer is relatively thick, which makes the thickness of the photovoltaic module thicker, increasing the risk of hidden breakage and cracking of the back-contact battery during the lamination process.

[0003] Based on this, how to reduce the thickness of photovoltaic modules has become an urgent problem to be solved. Summary of the invention

[0004] The present invention provides a connection structure, a photovoltaic module and a photovoltaic system to solve the technical problem of how to reduce the thickness of the photovoltaic module.

[0005] The embodiment of the present invention is implemented as follows: the present invention provides a connection structure, a photovoltaic module and a photovoltaic system. The photovoltaic module includes a battery string, a first welding strip, a second welding strip and a bus bar, the battery string includes a plurality of battery cells, the first welding strip and the second welding strip are alternately arranged on the backlight surface of the battery cell, the connection structure is arranged on the side of the first welding strip and the second welding strip away from the battery cell, and the bus bar is arranged on the side of the connection structure away from the welding strip; the connection structure includes a plurality of insulating parts and a plurality of conductive parts, the insulating part separates two adjacent conductive parts, the conductive part is used to be arranged corresponding to the first welding strip, the insulating part is used to be arranged corresponding to the second welding strip, the conductive part is used to electrically connect the first welding strip with the bus bar, and the insulating part is used to insulate the second welding strip from the bus bar.

[0006] Furthermore, the conductive part includes a conductive substrate and conductive blocks disposed at both ends of the conductive substrate; the insulating part includes an insulating substrate and insulating blocks disposed at both ends of the insulating substrate.

[0007] Furthermore, the conductive block comprises a viscous conductive block; and the insulating block comprises a viscous insulating block.

[0008] Further, in the length direction of the connection structure, the size of the conductive block is smaller than the size of the insulating block.

[0009] Furthermore, in the length direction of the connection structure, the size of the conductive substrate is smaller than the size of the insulating substrate.

[0010] Further, the conductive block comprises a pyramid-like conductive block; and / or the insulating block comprises a pyramid-like insulating block.

[0011] Furthermore, the conductive block provided at one end of the conductive substrate is a conductive groove, and the groove structure of the conductive groove corresponds to the structure of the first welding strip; the insulating block provided at one end of the insulating substrate is an insulating groove, and the groove structure of the insulating groove corresponds to the structure of the second welding strip.

[0012] Furthermore, the connection structure includes a filling module and a connection module, the connection module includes a plurality of the conductive parts and a plurality of the insulating parts, the filling module is located at at least one end of the connection module; in the thickness direction of the connection structure, the size of the filling module is larger than the size of the connection module.

[0013] Furthermore, the filling module is used to be arranged between two adjacent battery strings; in the length direction of the connection structure, the size of the filling module is less than or equal to the distance between the two adjacent battery strings.

[0014] Furthermore, there are multiple insulating parts, and the multiple insulating parts include an edge insulating part, the edge insulating part abuts against the filling module, and the edge insulating part includes a protruding section protruding toward the thickness direction of the busbar, and the protruding section wraps one end of the busbar.

[0015] Furthermore, the conductive substrate includes a copper foil conductive substrate, an aluminum foil conductive substrate and / or a composite conductive substrate.

[0016] Furthermore, the insulating matrix includes a polyethylene terephthalate insulating matrix, a polycarbonate insulating matrix, a polylactic acid insulating matrix, a nylon insulating matrix or a composite insulating matrix.

[0017] Furthermore, the conductive block includes a silicone resin conductive block, a polyimide resin conductive block, a phenolic resin conductive block, a polyurethane conductive block or a metal conductive block.

[0018] Furthermore, the insulating block includes an ethylene-vinyl acetate copolymer insulating block, a polyethylene insulating block, a polypropylene insulating block or a polyvinyl chloride insulating block.

[0019] An embodiment of the present invention further provides a photovoltaic module, which includes a battery string, a first welding strip, a second welding strip and a bus bar, the battery string includes a plurality of battery cells, the first welding strip and the second welding strip are alternately arranged on the backlight surface of the battery cells, the connecting structure is arranged on the side of the first welding strip and the second welding strip away from the battery cells, and the bus bar is arranged on the side of the connecting structure away from the first welding strip and the second welding strip; the connecting structure includes a plurality of insulating parts and a plurality of conductive parts, the insulating part separates two adjacent conductive parts, the conductive part is used to be arranged corresponding to the first welding strip, the insulating part is used to be arranged corresponding to the second welding strip, the conductive part is used to electrically conduct the first welding strip with the bus bar, and the insulating part is used to insulate the second welding strip from the bus bar.

[0020] An embodiment of the present invention further provides a photovoltaic system, which includes any photovoltaic assembly as described above.

[0021] Thus, in the connection structure of the present invention, since the busbar in the photovoltaic module is arranged on the connection structure, and the welding strip is located on the side of the connection structure away from the busbar, the conductive part in the connection structure is arranged corresponding to the first welding strip, and the insulating part in the connection structure is arranged corresponding to the second welding strip. This allows the busbar to be conductively connected to the first welding strip through the connection structure, and the busbar can also be insulated from the second welding strip through the connection structure at the same time, and there is no need to add a thick isolation strip between the busbar and the welding strip, and there is no need to open holes in the isolation strip, thereby reducing the risk of hidden breakage and cracking of the battery cell during the lamination process. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 is a schematic diagram of a module of a photovoltaic system provided by an embodiment of the present invention;

[0024] Figure 2 is a partial structural schematic diagram of a connection structure provided by an embodiment of the present invention;

[0025] Figure 3 is another partial structural schematic diagram of a connection structure provided by an embodiment of the present invention;

[0026] Figure 4 It is a schematic diagram of another part of the structure of the connection structure provided by an embodiment of the present invention;

[0027] Figure 5 is a partial structural schematic diagram of a battery assembly provided by an embodiment of the present invention;

[0028] Figure 6 It is another partial structural schematic diagram of a battery assembly provided by an embodiment of the present invention;

[0029] Figure 7 It is another partial structural schematic diagram of a battery assembly provided by an embodiment of the present invention.

[0030] Explanation of main component symbols: 1000, photovoltaic system; 1001, photovoltaic module; 100, battery string; 200, front panel; 300, connection structure; 400, first welding strip; 500, second welding strip; 600, bus bar; 11, conductive part; 12, insulating part; 10, connecting module; 20, filling module; 111, conductive substrate; 112, conductive block; 1121, conductive groove; 121, insulating substrate; 122, insulating block; 1221, insulating groove; 120, edge insulating part; 1201, protrusion section. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. In addition, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0032] In the description of the present invention, it is necessary to understand that the terms "length", "width", "up", "down", "top", "bottom", "lateral", "longitudinal" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0033] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art may be aware of the application of other processes and / or the use scenarios of other materials.

[0036] See also Figure 1 The photovoltaic system 1000 in the embodiment of the present invention may include the photovoltaic module 1001 in the embodiment of the present invention. The photovoltaic module 1001 in the embodiment of the present invention may include a battery string 100, a first welding strip 400, a second welding strip 500 and a bus bar 600. The battery string 100 includes a plurality of battery cells, and the plurality of battery cells are sequentially connected in series through welding strips to form the battery string 100. The battery strings 100 in the photovoltaic module 1001 may be connected in series, in parallel, or in series-parallel combination to realize the current bus output. For example, the connection between the battery strings 100 may be realized through the bus bar 600.

[0037] The accompanying drawings provided by the present invention are schematic diagrams, and some elements are not shown in the drawings. The purpose is to clearly describe the technical solution and highlight the key points of the invention. It is not intended to limit the technical solution to not include these unshown elements. In other words, the accompanying drawings are only examples and do not represent a limitation on the specific form of the photovoltaic module 1001.

[0038] like Figures 2 to 7As shown, the present invention provides a connection structure 300 for a photovoltaic module 1001, and the photovoltaic module 1001 includes a battery cell, a first welding strip 400, a second welding strip 500 and a bus bar 600. The first welding strip 400 and the second welding strip 500 are alternately arranged on the backlight surface of the battery cell, the connection structure 300 is arranged on the side of the first welding strip 400 and the second welding strip 500 away from the battery cell, and the bus bar 600 is arranged on the side of the connection structure 300 away from the welding strip; the connection structure 300 includes a plurality of insulating parts 12 and a plurality of conductive parts 11, the insulating part 12 separates two adjacent conductive parts 11, the conductive part 11 is used to be arranged corresponding to the first welding strip 400, the insulating part 12 is used to be arranged corresponding to the second welding strip 500, the conductive part 11 is used to electrically connect the first welding strip 400 with the bus bar 600, and the insulating part 12 is used to insulate the second welding strip 500 from the bus bar 600.

[0039] Thus, in the connection structure 300 of the present invention, since the busbar 600 in the photovoltaic module 1001 is arranged on the connection structure 300, and the welding strip is located on the side of the connection structure 300 away from the busbar 600, the conductive part 11 in the connection structure 300 is arranged corresponding to the first welding strip 400, and the insulating part 12 in the connection structure 300 is arranged corresponding to the second welding strip 500. This allows the busbar 600 to be conductively connected to the first welding strip 400 through the connection structure 300, and the busbar 600 can also be insulated from the second welding strip 500 through the connection structure 300, and there is no need to add a thick isolation strip between the busbar 600 and the welding strip, and there is no need to open holes in the isolation strip, thereby reducing the risk of hidden breakage and cracking of the battery cell during the lamination process. Specifically, the battery cell in the present invention can be a back contact solar cell.

[0040] Specifically, further, the cell comprises a front side and a back side facing each other, the front side faces the sun and mainly receives direct sunlight, and the back side is the side of the cell with electrodes. The electrodes of the cell can be main grids and / or fine grids.

[0041] There are two types of electrode polarities of a battery cell, namely, a first electrode and a second electrode. The polarities of the first electrode and the second electrode are opposite. Furthermore, one of the first electrode and the second electrode is a positive electrode, and the other of the first electrode and the second electrode is a negative electrode. For example, the first electrode is a positive electrode, and the second electrode is a negative electrode; or, the second electrode is a positive electrode, and the first electrode is a negative electrode.

[0042] Furthermore, the first welding ribbon 400 of the photovoltaic component 1001 is electrically connected to the first electrode, and the second welding ribbon 500 of the photovoltaic component 1001 is electrically connected to the second electrode.

[0043] Specifically, the connection structure 300 is disposed on a side of the first welding ribbon 400 and the second welding ribbon 500 away from the battery cell, and the bus bar 600 is disposed on a side of the connection structure 300 away from the first welding ribbon 400 and the second welding ribbon 500. The bus bar 600 is conductively connected to the first welding ribbon 400 through the connection structure 300, and the bus bar 600 is insulated from the second welding ribbon 500 through the connection structure 300.

[0044] Specifically, the connection structure 300 includes a plurality of insulating portions 12 and a plurality of conductive portions 11, wherein the insulating portion 12 separates two adjacent conductive portions 11. The insulating portions 12 and the conductive portions 11 in the connection structure 300 are staggered. In other words, one insulating portion 12 is formed between two adjacent conductive portions 11, and one conductive portion 11 is formed between two adjacent insulating portions 12. The conductive portion 11 is disposed correspondingly to the first soldering strip 400, and the insulating portion 12 is disposed correspondingly to the second soldering strip 500.

[0045] It can be understood that “the conductive portion 11 is disposed correspondingly to the first soldering strip 400” means that the positions of the conductive portion 11 and the first soldering strip 400 match in the length direction of the connection structure 300. “The insulating portion 12 is disposed correspondingly to the second soldering strip 500” means that the positions of the insulating portion 12 and the second soldering strip 500 match in the length direction of the connection structure 300.

[0046] Furthermore, the conductive portion 11 is located between the first welding strip 400 and the bus bar 600, electrically connecting the first welding strip 400 and the bus bar 600; the insulating portion 12 is located between the second welding strip 500 and the bus bar 600, electrically connecting the second welding strip 500 and the bus bar 600. In this way, when the bus bar 600 is set, the insulation or electrical connection between the bus bar 600 and the welding strip can be achieved simultaneously through the connection structure 300. Furthermore, when the bus bar 600 is set in the photovoltaic module 1001, it is avoided to set a thick isolation strip between the bus bar 600 and the welding strip, thereby reducing the overall thickness of the photovoltaic module 1001, thereby reducing the risk of hidden breakage and cracking of the battery cell during the lamination process.

[0047] In a possible implementation, Figures 2 to 7 As shown. The connection structure 300 includes a filling module 20 and a connection module 10. The connection structure 300 includes a plurality of conductive parts 11 and a plurality of insulating parts 12. The filling module 20 is located at at least one end of the connection structure 300. In the thickness direction of the connection structure 300, the dimension D5 of the filling module 20 is greater than the dimension D6 of the connection module 10. In this way, the connection structure 300 can fill the gap between adjacent battery strings 100 through the filling module 20. When installing the connection structure 300, the connection structure 300 can be accurately positioned, which facilitates the installation of the connection structure 300 and avoids unstable connection or poor contact caused by deviation during the installation process.

[0048] Specifically, the filling module 20 is used to be arranged between two adjacent battery strings 100; in the length direction of the connection structure 300, the size of the filling module 20 is less than or equal to the spacing between two adjacent battery strings 100. In this way, the connection structure 300 can fill the spacing between two adjacent battery strings 100 through the filling module 20. At the same time, during the assembly process of the photovoltaic module 1001, the filling module 20 can further help to accurately align the battery string 100, so that the battery string 100 maintains a stable position during the lamination process, avoiding poor contact or electrical connection problems caused by position deviation.

[0049] In a possible implementation, the conductive part 11 includes a conductive substrate 111 and conductive blocks 112 disposed at both ends of the conductive substrate 111; the insulating part 12 includes an insulating substrate 121 and insulating blocks 122 disposed at both ends of the insulating substrate 121. In this way, the conductive substrate 111 in the conductive part 11 and the conductive blocks 112 at both ends thereof can form a stable conductive structure, which can effectively conduct the first welding strip 400 and the bus bar 600 to ensure stable current transmission. At the same time, the insulating substrate 121 in the insulating part 12 and the insulating blocks 121 at both ends thereof can form a stable insulating structure, thereby preventing the second welding strip 500 from making electrical contact with the bus bar 600. In addition, the clear partitioning and block structure settings in the conductive part 11 and the insulating part 12 can simplify the assembly process of the conductive part 11 and the insulating part 12, facilitate the manufacture and mass production of the conductive part 11 and the insulating part 12, and improve the production efficiency of the conductive part 11 and the insulating part 12, thereby improving the production efficiency of the connecting structure 300 and the photovoltaic module 1001.

[0050] Specifically, the conductive substrate 111 is the main body of the conductive part 11. The conductive substrate 111 may specifically include a copper foil conductive substrate 111, an aluminum foil conductive substrate 111, or a composite conductive substrate 111. Further, the composite conductive substrate 111 may be made by a surface conductive film formation method, a conductive filler dispersion method, a conductive material lamination composite method, etc. Conductive blocks 112 are provided at both ends of the conductive substrate 111.

[0051] Specifically, the insulating substrate 121 is the main body of the insulating part 12. The insulating substrate 121 may include a polyethylene terephthalate insulating substrate 121, a polycarbonate insulating substrate 121, a polylactic acid insulating substrate 121, a nylon insulating substrate 121 or a composite insulating substrate 121. Insulating blocks 122 are provided at both ends of the insulating substrate 121.

[0052] In a possible implementation, the conductive block 112 includes a sticky conductive block 112; the insulating block 122 includes a sticky insulating block 122. Specifically, the conductive block 112 and the insulating block 122 may be adhesive. In this way, the connection structure 300 may be adhesively connected to the bus bar 600 and the welding strip, thereby enhancing the reliability of the connection. Optionally, when manufacturing the bus bar 600, there is no need to set a solder layer in the bus bar 600, thereby reducing the consumption of solder and further reducing the thickness of the bus bar 600, thereby reducing the thickness of the photovoltaic module 1001. At the same time, when setting the welding strip, there is no need to set solder to achieve the connection of the welding strip, thereby further reducing the consumption of solder.

[0053] Specifically, the conductive blocks 112 on both sides of the conductive substrate 111 may be adhesive conductive blocks 112, and the insulating blocks 122 on both sides of the conductive substrate 111 may be adhesive insulating blocks 122. In this way, double-sided bonding of the connection structure 300 may be achieved.

[0054] Specifically, the conductive block 112 may include a silicone resin conductive block 112 , a polyimide resin conductive block 112 , a phenolic resin conductive block 112 , a polyurethane conductive block 112 or a metal conductive block 112 .

[0055] Further, the insulating block 122 may specifically be an insulating block 122 including an ethylene-vinyl acetate copolymer insulating block 122, a polyethylene insulating block 122, a polypropylene insulating block 122 or a polyvinyl chloride insulating block 122. Preferably, the insulating block 122 may include a weather-resistant layer coated on the surface of the insulating block 122 to improve the stability and weather resistance of the insulating substrate 121.

[0056] Furthermore, if Figure 2 As shown, in the length direction of the connection structure 300, the size D1 of the conductive block 112 is smaller than the size D2 of the insulating block 122. It can be understood that the manufacturing cost of the conductive block 112 is higher than the manufacturing cost of the insulating block 122. Setting the size D1 of the conductive block 112 smaller than the size D2 of the insulating block 122 can reduce the amount of the conductive block 112, thereby reducing the overall manufacturing cost of the photovoltaic module 1001.

[0057] Furthermore, if Figure 2 As shown, in the length direction of the connection structure 300, the size D3 of the conductive substrate 111 is smaller than the size D4 of the insulating substrate 121. It can be understood that the manufacturing cost of the conductive substrate 111 is higher than the manufacturing cost of the insulating substrate 121. Setting the size D3 of the conductive substrate 111 smaller than the size D4 of the insulating substrate 121 can reduce the amount of the conductive block 112, thereby reducing the overall manufacturing cost of the photovoltaic module 1001.

[0058] In a possible implementation, Figure 3 and Figure 5 As shown, the conductive block 112 is a pyramid-like conductive block 112; and / or the insulating block 122 is a pyramid-like insulating block 122. Thus, when setting the connection structure 300, the conductive part 11 and / or the insulating part 12 can be set by plugging, which can reduce the difficulty of setting the connection structure 300.

[0059] Specifically, when the conductive block 112 is a pyramid-like conductive block 112, each insulating portion 12 can be integrally formed. Two adjacent insulating portions 12 are spaced apart, and the conductive portion 11 can be inserted into the gap between the two adjacent insulating portions 12 to form a connection structure 300, thereby improving the manufacturing efficiency of the photovoltaic module 1001.

[0060] Specifically, when the insulating block 122 is a pyramid-like insulating block 122, each conductive part 11 can be integrally formed. Two adjacent insulating parts 12 are spaced apart, and the insulating part 12 can be inserted into the gap between the two adjacent conductive parts 11 to form a connection structure 300, thereby improving the stability of the connection structure 300 and the manufacturing efficiency of the photovoltaic module 1001.

[0061] In a possible implementation, Figure 4 and Figure 7 As shown, the conductive block 112 disposed at one end of the conductive substrate 111 is a conductive groove 1121, and the groove structure of the conductive groove 1121 corresponds to the structure of the first welding strip 400; the insulating block 122 disposed at one end of the insulating substrate 121 is an insulating groove 1221, and the groove structure of the insulating groove 1221 corresponds to the structure of the second welding strip 500. In this way, a stable connection with the welding strip can be achieved through the conductive groove 1121 and the insulating groove 1221, thereby improving the connection stability of the welding strip.

[0062] Specifically, the conductive groove 1121 is disposed at one end of the conductive substrate 111 facing the first welding strip 400 . The groove structure of the conductive groove 1121 corresponds to the structure of the first welding strip 400 , and a stable conductive connection can be achieved between the conductive part 11 and the connection structure 300 .

[0063] Specifically, the insulation groove 1221 is disposed at one end of the insulation substrate 121 facing the first welding strip 400 , and the groove structure of the insulation groove 1221 corresponds to the structure of the second welding strip 500 , so as to achieve stable insulation between the insulation groove 1221 and the connection structure 300 .

[0064] In addition, the groove structure of the conductive groove 1121 can be set according to the outer contour of the first welding strip 400 , and the groove structure of the insulating groove 1221 can be set according to the outer contour of the second welding strip 500 .

[0065] In a possible implementation, there are multiple insulating parts 12, and the multiple insulating parts 12 include an edge insulating part 120, the edge insulating part 120 abuts against the filling module 20, and the edge insulating part 120 includes a protruding section 1201 protruding toward the thickness direction of the busbar 600, and the protruding section 1201 wraps one end of the busbar 600. In this way, the busbar 600 can be fixed by the protruding section 1201. Since the edge insulating part 120 directly contacts the filling module 20, and its protruding section 1201 wraps one end of the busbar 600, this can not only ensure that the busbar 600 is stably and accurately installed in the photovoltaic module 1001, but also play a role in fixing the busbar 600, reducing the position change caused by vibration or external force.

[0066] At the same time, by providing a protruding section 1201 on the edge insulating portion 120 , one end of the busbar 600 can be effectively wrapped to avoid contact with other conductive parts 11 or the battery string 100 , thereby improving the insulation performance of the connection structure 300 .

[0067] The photovoltaic module 1001 in the embodiment of the present invention includes a battery cell, a first welding strip 400, a second welding strip 500, a bus bar 600 and the above-mentioned connection structure 300; the first welding strip 400 and the second welding strip 500 are alternately arranged on the back light surface of the battery cell, the connection structure 300 is arranged on the side of the first welding strip 400 and the second welding strip 500 away from the battery cell, and the bus bar 600 is arranged on the side of the connection structure 300 away from the welding strip; the conductive part 11 is used to be arranged corresponding to the first welding strip 400, and the insulating part 12 is used to be arranged corresponding to the second welding strip 500, the conductive part 11 is used to electrically conduct the first welding strip 400 and the bus bar 600, and the insulating part 12 is used to insulate the second welding strip 500 from the bus bar 600.

[0068] Thus, in the photovoltaic module 1001 of the present invention, since the busbar 600 in the photovoltaic module 1001 is arranged on the connection structure 300, and the welding strip is located on the side of the connection structure 300 away from the busbar 600, the conductive part 11 in the connection structure 300 is arranged corresponding to the first welding strip 400, and the conductive part 11 and the insulating part 12 in the connection structure 300 are arranged corresponding to the second welding strip 500. This allows the busbar 600 to be conductively connected to the first welding strip 400 through the connection structure 300, and the busbar 600 can also be insulated from the second welding strip 500 through the connection structure 300, and there is no need to add a thick isolation strip between the busbar 600 and the welding strip, and there is no need to open holes in the isolation strip, thereby reducing the risk of hidden breakage and cracking of the battery cell during the lamination process.

[0069] In a possible implementation, the busbar 600 and the connection structure 300 are disposed on the backlight side of the cell, so that the busbar 600 and the connection structure 300 can be hidden, thereby effectively making the front side of the cell smoother and simpler, thereby improving the overall aesthetics of the photovoltaic module 1001.

[0070] It is understandable that the photovoltaic module 1001 may also include a frame, a back plate, photovoltaic glass and an adhesive film. The adhesive film may be filled between the front and back surfaces of the cell and between the photovoltaic glass and adjacent cells, etc. As a filler, it may be a transparent colloid with good light transmission and aging resistance, for example, the adhesive film may be an EVA adhesive film or a POE adhesive film, which may be selected according to actual conditions and is not limited here.

[0071] Photovoltaic glass can cover the adhesive film on the front of the cell. Photovoltaic glass can be ultra-white glass, which has high light transmittance, high transparency, and excellent physical, mechanical and optical properties. For example, the light transmittance of ultra-white glass can reach more than 92%, which can protect the cell without affecting the efficiency of the cell as much as possible. At the same time, the adhesive film can bond the photovoltaic glass and the cell together. The presence of the adhesive film can seal and insulate the cell and make it waterproof and moisture-proof.

[0072] The backplane can be attached to the film on the backlight side of the cell. The backplane can protect and support the cell and has reliable insulation, water resistance and aging resistance. There are multiple options for the backplane, which can usually be tempered glass, organic glass, aluminum alloy composite film, etc. It can be set according to the specific situation and is not limited here. The whole composed of the backplane, cell, film and photovoltaic glass can be set on the frame. The frame serves as the main external support structure of the entire photovoltaic module 1001 and can stably support and install the photovoltaic module 1001. For example, the photovoltaic module 1001 can be installed at the required location through the frame.

[0073] In the description of this specification, the description with reference to the terms "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0074] In addition, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A connection structure for a photovoltaic module, characterized in that: The photovoltaic module comprises a battery string, a first welding strip, a second welding strip and a bus bar, the battery string comprises a plurality of battery cells, the first welding strip and the second welding strip are alternately arranged on the backlight surface of the battery cells, the connecting structure is arranged on a side of the first welding strip and the second welding strip away from the battery cells, and the bus bar is arranged on a side of the connecting structure away from the first welding strip and the second welding strip; The connection structure includes a plurality of insulating parts and a plurality of conductive parts, the insulating part separates two adjacent conductive parts, the conductive part is used to be arranged corresponding to the first welding strip, the insulating part is used to be arranged corresponding to the second welding strip, the conductive part is used to electrically connect the first welding strip with the bus bar, and the insulating part is used to insulate the second welding strip from the bus bar.

2. The connection structure according to claim 1, characterized in that: The conductive part includes a conductive substrate and conductive blocks arranged at both ends of the conductive substrate; The insulating part includes an insulating base and insulating blocks arranged at two ends of the insulating base.

3. The connection structure according to claim 2, characterized in that: The conductive block includes a viscous conductive block; The insulating block includes a viscous insulating block.

4. The connection structure according to claim 3, characterized in that: In the length direction of the connection structure, the size of the conductive block is smaller than the size of the insulating block.

5. The connection structure according to claim 2, characterized in that: In the length direction of the connection structure, the size of the conductive substrate is smaller than the size of the insulating substrate.

6. The connection structure according to claim 2, characterized in that: The conductive block comprises a pyramid-like conductive block; And / or, the insulating block comprises a pyramid-like insulating block.

7. The connection structure according to claim 2, characterized in that: The conductive block provided at one end of the conductive substrate is a conductive slot, and the groove structure of the conductive slot corresponds to the structure of the first welding strip; The insulating block disposed at one end of the insulating substrate is an insulating groove, and a groove structure of the insulating groove corresponds to a structure of the second welding strip.

8. The connection structure according to claim 2, characterized in that: The connection structure comprises a filling module and a connection module, the connection module comprises a plurality of the conductive parts and a plurality of the insulating parts, and the filling module is located at at least one end of the connection module; In the thickness direction of the connection structure, the size of the filling module is larger than the size of the connection module.

9. The connection structure according to claim 8, characterized in that: The filling module is used to be arranged between two adjacent battery strings; in the length direction of the connection structure, the size of the filling module is less than or equal to the distance between the two adjacent battery strings.

10. The connection structure according to claim 8, characterized in that: There are multiple insulating parts, which include an edge insulating part that abuts against a filling module and includes a protruding section that protrudes toward a thickness direction of the busbar, and the protruding section wraps one end of the busbar.

11. The connection structure according to claim 2, characterized in that: The conductive substrate includes a copper foil conductive substrate, an aluminum foil conductive substrate and / or a composite conductive substrate.

12. The connection structure according to claim 2, characterized in that: The insulating matrix includes a polyethylene terephthalate insulating matrix, a polycarbonate insulating matrix, a polylactic acid insulating matrix, a nylon insulating matrix or a composite insulating matrix.

13. The connection structure according to claim 2, characterized in that: The conductive blocks include silicone resin conductive blocks, polyimide resin conductive blocks, phenolic resin conductive blocks, polyurethane conductive blocks or metal conductive blocks.

14. The connection structure according to claim 2, characterized in that: The insulating block includes an ethylene-vinyl acetate copolymer insulating block, a polyethylene insulating block, a polypropylene insulating block or a polyvinyl chloride insulating block.

15. A photovoltaic module, characterized in that: include: The photovoltaic module comprises a battery cell, a first welding ribbon, a second welding ribbon, a bus bar and a connection structure according to any one of claims 1 to 14; The first welding strips and the second welding strips are alternately arranged on the backlight surface of the battery cell, the connecting structure is arranged on the side of the first welding strips and the second welding strips away from the battery cell, and the bus bar is arranged on the side of the connecting structure away from the welding strips; The conductive portion is used to be arranged corresponding to the first welding strip, and the insulating portion is used to be arranged corresponding to the second welding strip. The conductive portion is used to electrically connect the first welding strip and the bus bar, and the insulating portion is used to insulate the second welding strip from the bus bar.

16. The photovoltaic module according to claim 15, characterized in that: The bus bar and the connection structure are arranged on the backlight surface of the battery cell.

17. A photovoltaic system, characterized in that: The photovoltaic module comprises the photovoltaic module as claimed in any one of claims 15 to 16.

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