Battery piece interconnection structure and photovoltaic module

Abstract

The utility model provides a battery piece interconnection structure and a photovoltaic module, the battery piece interconnection structure comprises at least two adjacent battery pieces, a first insulating layer, a second insulating layer, a first conducting strip and a second conducting strip, each battery piece comprises a front electrode and a back electrode which are oppositely arranged, and the polarities of the front electrode and the back electrode are opposite; the battery piece further comprises a first side face and a second side face which are oppositely arranged. The first insulating layer is arranged on the first side surface; the second insulating layer is arranged on the second side surface; the first conducting strip is electrically connected with the back electrode, and the first conducting strip is in insulated connection with the first side surface through the first insulating layer; the second conducting strip is electrically connected with the front electrode, and the second conducting strip is in insulated connection with the second side surface through the second insulating layer; and the battery piece is electrically connected with the second conducting strip of another adjacent battery piece through the first conducting strip. According to the invention, the arrangement density of the cells is improved, and the generation power of the photovoltaic module is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the solar photovoltaic technology, and particularly to a cell interconnection structure and a photovoltaic module. BACKGROUND

[0002] The photovoltaic module is also called a solar panel, which is a device for converting sunlight into electrical energy by using the photovoltaic effect. The cell is the core of the photovoltaic module, which can be made of semiconductor materials and is responsible for photoelectric conversion. The smaller the gap between two adjacent cells in the photovoltaic module, the more compact the arrangement of the cells, and the more cells can be placed in the same area, so that the power generation of the photovoltaic module is higher.

[0003] In the related art, the connection between the cells in the photovoltaic module is mainly to connect the front electrodes and the back electrodes of the adjacent cells by using a solder strip, which is generally in the shape of "Z". In the lamination process of the photovoltaic module using the above-mentioned method, the solder strip will generate pressure on the edge of the cell, causing the cell to be broken or cracked. In order to avoid this problem, a certain gap can be provided between two adjacent cells in the photovoltaic module, which can provide a buffer space for the cell and the solder strip to avoid the cell being broken or cracked during the lamination process. However, the existence of the above-mentioned gap reduces the arrangement density of the cell and affects the power generation of the photovoltaic module. UTILITY MODEL CONTENT

[0004] In order to overcome the above-mentioned defects in the related art, the purpose of the present application is to provide a cell interconnection structure and a photovoltaic module.

[0005] In one aspect, the present application provides a cell interconnection structure, comprising:

[0006] at least two adjacent cells, the cell comprising a front electrode and a back electrode oppositely arranged along a first direction, the polarity of the front electrode being opposite to that of the back electrode; the cell further comprising a first side and a second side oppositely arranged along a second direction;

[0007] a first insulating layer provided on the first side;

[0008] a second insulating layer provided on the second side;

[0009] a first conductive sheet electrically connected with the back electrode, and the first conductive sheet is insulatedly connected with the first side through the first insulating layer;

[0010] a second conductive sheet electrically connected with the front electrode, and the second conductive sheet is insulatedly connected with the second side through the second insulating layer;

[0011] The battery piece is electrically connected to the second conductive piece of another adjacent battery piece through the first conductive piece.

[0012] In a possible implementation, the first conductive piece comprises a first segment and a second segment connected to each other, the first segment is located on the first insulating layer, and the second segment is electrically connected to the back electrode;

[0013] The second conductive piece comprises a third segment and a fourth segment connected to each other, the third segment is located on the second insulating layer, and the fourth segment is electrically connected to the front electrode;

[0014] The battery piece is electrically connected to the third segment of another adjacent battery piece through the first segment.

[0015] In a possible implementation, along the second direction, the battery piece is electrically connected to the third segment of another adjacent battery piece through a side of the first segment away from the first insulating layer and a side of the third segment away from the second insulating layer.

[0016] In a possible implementation, in a plane perpendicular to the second direction, a projection of the first segment and a projection of the third segment at least partially coincide.

[0017] In a possible implementation, along the first direction, the battery piece is electrically connected to the third segment of another adjacent battery piece through an end of the first segment away from the second segment and an end of the third segment away from the fourth segment.

[0018] In a possible implementation, in a plane perpendicular to the first direction, a projection of the first segment and a projection of the third segment at least partially coincide.

[0019] In a possible implementation, along the third direction, the battery piece is electrically connected to the third segment of another adjacent battery piece through the first segment.

[0020] In a possible implementation, along the third direction, the first segment and the third segment are staggered; and in a plane perpendicular to the third direction, a projection of the first segment and a projection of the third segment at least partially coincide.

[0021] In a possible implementation, the first conductive piece and the second conductive piece are each independently a tin-coated copper piece, a lead-containing tin-coated copper piece, or a silver-containing tin-coated copper piece.

[0022] In a possible implementation, the first conductive piece has a thickness of 50-500 μm.

[0023] And / or, the thickness of the second conductive sheet is 50-500 μm.

[0024] In a possible implementation, the first insulating layer and the second insulating layer are each independently a polyethylene terephthalate layer, an ethylene-tetrafluoroethylene copolymer layer, an ethylene-chlorotrifluoroethylene copolymer layer, a polymethylpentene layer, a cyclic olefin copolymer layer, a polybutylene terephthalate layer, a polypropylene layer, or a polycarbonate layer.

[0025] In a possible implementation, the thickness of the first insulating layer is 50-400 μm.

[0026] And / or, the thickness of the second insulating layer is 50-400 μm.

[0027] In a possible implementation, the front electrode includes a plurality of positive electrode ribbons extending along the second direction, the plurality of positive electrode ribbons being spaced apart along a third direction; the fourth section is provided with a plurality of positive electrode pads, the plurality of positive electrode pads corresponding to the plurality of positive electrode ribbons one by one and being electrically connected to the plurality of positive electrode ribbons.

[0028] The back electrode includes a plurality of negative electrode ribbons extending along the second direction, the plurality of negative electrode ribbons being spaced apart along the third direction; the second section is provided with a plurality of negative electrode pads, the plurality of negative electrode pads corresponding to the plurality of negative electrode ribbons one by one and being electrically connected to the plurality of negative electrode ribbons.

[0029] In another aspect, the application provides a photovoltaic module, including a front plate, a front encapsulation adhesive film, a cell piece interconnection structure as any of the above, a back encapsulation adhesive film, and a back plate.

[0030] The present application provides a cell interconnect structure and a photovoltaic module. The cell interconnect structure includes at least two adjacent cells, a first insulating layer, a second insulating layer, a first conductive sheet, and a second conductive sheet. The cell includes a front electrode and a back electrode disposed oppositely along a first direction, the front electrode and the back electrode having opposite polarities. The cell also includes a first side surface and a second side surface disposed oppositely along a second direction. The first insulating layer is disposed on the first side surface; the second insulating layer is disposed on the second side surface. The first conductive sheet is electrically connected to the back electrode and insulated from the first side surface by the first insulating layer. The second conductive sheet is electrically connected to the front electrode and insulated from the second side surface by the second insulating layer. The cell is electrically connected to the second conductive sheet of another adjacent cell via the first conductive sheet. The present application provides first and second conductive sheets on either side of the cell to replace the "Z"-shaped welding strips used in related art. Two adjacent cells are electrically connected via the first and second conductive sheets. This ensures that the first and second conductive sheets do not generate mechanical stress on the cells during the lamination process of the photovoltaic module, and reduces the gaps between the cells, thereby increasing the cell arrangement density and the power generation efficiency of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 A simplified structural diagram of a battery cell, a first insulating layer, a first conductive sheet, a second insulating layer, and a second conductive sheet provided in one embodiment of the present application;

[0033] Figure 2 A simplified structural diagram of a cell interconnection structure provided in one embodiment of the present application;

[0034] Figure 3 for Figure 2 Current flow diagram;

[0035] Figure 4 A simplified structural diagram of a battery cell, a first insulating layer, a first conductive sheet, a second insulating layer, and a second conductive sheet provided in another embodiment of the present application;

[0036] Figure 5 A simplified structural diagram of a cell interconnection structure provided in another embodiment of the present application;

[0037] Figure 6 for Figure 5 Current flow diagram;

[0038] Figure 7 The axial view of the battery piece, the first insulating layer, the first conductive piece, the second insulating layer and the second conductive piece provided by an embodiment of the present application is shown.

[0039] Reference signs:

[0040] 100 - battery piece; 110 - front electrode; 111 - positive electrode ribbon; 120 - back electrode;

[0041] 200 - first insulating layer;

[0042] 300 - second insulating layer;

[0043] 400 - first conductive piece; 410 - first section; 420 - second section;

[0044] 500 - second conductive piece; 510 - third section; 520 - fourth section; 521 - positive electrode pad;

[0045] X - first direction; Y - second direction; Z - third direction. DETAILED DESCRIPTION

[0046] In order to make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application.

[0047] Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present application. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0048] As described in the background, the photovoltaic module in the related art is provided with a certain gap between adjacent battery pieces, thereby reducing the arrangement density of the battery pieces and affecting the power generation of the photovoltaic module.

[0049] Therefore, the embodiments of the present application aim to provide a battery piece interconnection structure and a photovoltaic module. The first conductive piece and the second conductive piece are respectively arranged on two sides of the battery piece to replace the "Z" type ribbon in the related art. The first conductive piece and the second conductive piece are welded to the adjacent two battery pieces, so as to ensure that the first conductive piece and the second conductive piece do not generate mechanical stress on the battery piece during the lamination process, reduce the gap between the battery pieces, and be conducive to improving the arrangement density of the battery pieces and improving the power generation of the photovoltaic module.

[0050] The content of the embodiments of the present application will be described in detail below with reference to the drawings, so that those skilled in the art can understand the content of the present application more specifically. It should be noted that in the description of the embodiments of the present application, the first direction X, the second direction Y and the third direction Z are three different directions in a three-dimensional space; for example, the first direction X, the second direction Y and the third direction Z can be perpendicular to each other, and the first direction X can be the direction of sunlight.

[0051] Please refer to Figures 1-7 The present embodiment provides a battery piece interconnection structure, comprising:

[0052] At least two adjacent battery pieces 100, the battery piece 100 is generally cuboid, and the battery piece 100 can be a crystalline silicon battery piece or a laminated battery piece. The projection of the battery piece 100 in the plane perpendicular to the first direction X can be a square, and the side length of the square can be 156mm-240mm; the size of the battery piece 100 in the first direction X can be 80μm-150μm. The battery piece 100 comprises a front electrode 110 and a back electrode 120 oppositely arranged along the first direction X, and the polarity of the front electrode 110 and the back electrode 120 is opposite. Exemplarily, the front electrode 110 can be the side of the battery piece 100 facing the sunlight when in use, and the back electrode 120 can be the side of the battery piece 100 facing away from the sunlight when in use; the front electrode 110 can be the positive electrode of the battery piece 100, and the back electrode 120 can be the negative electrode of the battery piece 100. When a plurality of battery pieces 100 are connected to each other, the front electrodes 110 of the battery pieces 100 are all located on the same side, and the back electrodes 120 are all located on the same side. The battery piece 100 further comprises a first side and a second side oppositely arranged along the second direction Y.

[0053] A first insulating layer 200 is arranged on the first side. Exemplarily, the first insulating layer 200 can be arranged on the first side by adhesion or the like.

[0054] A second insulating layer 300 is arranged on the second side. Exemplarily, the second insulating layer 300 can be arranged on the second side by adhesion or the like.

[0055] A first conductive sheet 400 is electrically connected with the back electrode 120, and the first conductive sheet 400 is insulatedly connected with the first side through the first insulating layer 200.

[0056] A second conductive sheet 500 is electrically connected with the front electrode 110, and the second conductive sheet 500 is insulatedly connected with the second side through the second insulating layer 300.

[0057] In the embodiment, the battery piece 100 is electrically connected with the second conductive piece 500 of another adjacent battery piece 100 through the first conductive piece 400, so as to electrically connect the two adjacent battery pieces 100.

[0058] It can be understood that, in the embodiment, the first conductive piece 400 and the second conductive piece 500 replace the "Z"-shaped welding strip in the related art, so as to ensure that the conductive piece does not generate mechanical stress on the battery piece 100 during the lamination process of the photovoltaic module. Compared with the scheme in the related art, the gap between the two adjacent battery pieces 100 is greatly reduced, which is conducive to improving the arrangement density of the battery piece 100 and improving the power generation power of the photovoltaic module.

[0059] The battery piece interconnection structure in the embodiment can realize seamless connection of the adjacent battery pieces 100, and greatly improves the light utilization rate at the gap between the battery pieces in the photovoltaic module.

[0060] Since the light utilization rate at the gap between the battery pieces is improved, the area required for packaging the same number of battery pieces in the photovoltaic module is greatly reduced, and thus the power generation efficiency of the photovoltaic module is improved.

[0061] Specifically, the first conductive piece 400 in the embodiment includes a first segment 410 and a second segment 420 connected with each other, the first segment 410 and the second segment 420 are perpendicular to each other, and together form a shape substantially in the form of "L". The first segment 410 is located on the first insulating layer 200; for example, the first segment 410 and the first insulating layer 200 can be bonded. The second segment 420 is electrically connected with the back electrode 120; for example, the second segment 420 and the back electrode 120 can be electrically connected through abutting, welding or the like. It should be noted that, along the first direction X, one end of the first segment 410 can be flush with the back electrode 120 of the battery piece 100; the second segment 420 extends to one end of the first segment 410 and is connected with the first segment 410. The first segment 410 and the second segment 420 can be integrally formed, and can be formed by bending the same plate.

[0062] The second conductive sheet 500 includes a third segment 510 and a fourth segment 520 connected to each other, and the third segment 510 and the fourth segment 520 are perpendicular to each other and together form a substantially L-shaped structure. The third segment 510 is located on the second insulating layer 300; and the third segment 510 and the second insulating layer 300 are connected by, for example, adhesion. The fourth segment 520 is electrically connected to the front electrode 110; and the fourth segment 520 and the front electrode 110 are electrically connected by, for example, abutting or welding. It should be noted that, along the first direction X, one end of the third segment 510 can be flush with the front electrode 110 of the battery sheet 100; the fourth segment 520 extends to the one end of the third segment 510 and is connected to the third segment 510. The third segment 510 and the fourth segment 520 can be integrally formed, and the third segment 510 and the fourth segment 520 can be formed by bending a same sheet.

[0063] The battery sheet 100 is electrically connected to the third segment 510 of another adjacent battery sheet 100 through the first segment 410, so as to electrically connect the two adjacent battery sheets 100. The first segment 410 and the third segment 510 are electrically connected by, for example, abutting or welding.

[0064] Since only the first insulating layer 200, the first segment 410 of the first conductive sheet 400, the third segment 510 of the second conductive sheet 500 and the second insulating layer 300 exist between the two adjacent battery sheets 100, compared with the related art, the gap between the two adjacent battery sheets 100 is greatly reduced, which is conducive to improving the arrangement density of the battery sheet 100 and improving the power generation of the photovoltaic module.

[0065] The L-shaped first conductive sheet 400 and the L-shaped second conductive sheet 500 can replace the Z-shaped solder strip in the related art, and the length of the conductive sheet can be reduced, thereby reducing the cost.

[0066] The battery sheet interconnection structure of the embodiment can be further combined with silver-coated copper technology / electroplated copper technology, and the amount of silver paste and the light shielding area can be further reduced, thereby reducing the cost and increasing the efficiency.

[0067] The battery sheet interconnection structure of the embodiment is suitable for seamless interconnection of various modules such as a Passivated Emitter and Rear Cell (PERC) module, a Heterojunction Solar Cell (HJT) module, a Tunnel Oxide Passivating Contacts (TOPCon) module and a laminated module, and is also suitable for seamless interconnection of full-sheet / half-sheet modules, single-glass / double-glass modules and modules with / without main grids.

[0068] The battery piece interconnection structure of the embodiment makes the arrangement of the battery pieces 100 more compact, and the whole appearance more magnificent and beautiful.

[0069] The battery piece interconnection structure of the embodiment simplifies the complicated operation process of the traditional battery piece connection process, reduces the risk of causing hidden cracks or fragments of the battery pieces, is simple and efficient, practical, and has great application value.

[0070] Please continue to refer to Figures 1-3 In one possible implementation, along the second direction Y, the battery piece 100 is electrically connected with the third segment 510 of the adjacent another battery piece 100 through the first segment 410 away from the side of the first insulating layer 200. At this time, the structure of the first conductive piece 400 and the structure of the second conductive piece 500 on the adjacent two battery pieces 100 can be the same or different, as long as the projection of the first segment 410 and the projection of the third segment 510 at least partially overlap in the plane perpendicular to the second direction Y.

[0071] The size of the first segment 410 and the size of the third segment 510 in the embodiment can be set as needed. Exemplarily, along the first direction X, the length of the first segment 410 can be equal to two-thirds of the length of the first side, and the length of the third segment 510 can be equal to half of the length of the first side; or, the length of the first segment 410 and the length of the third segment 510 can be equal, both of which can be equal to the length of the first side, thereby increasing the electrical connection area of the adjacent two battery pieces 100. Along the third direction Z, the length of the first segment 410 can be equal to half of the length of the first side, and the length of the third segment 510 can be equal to two-thirds of the length of the first side; or, the length of the first segment 410 and the length of the third segment 510 can be equal, both of which can be equal to the length of the first side, thereby increasing the electrical connection area of the adjacent two battery pieces 100.

[0072] Further, the first conductive piece 400 and the second conductive piece 500 on the same battery piece 100 can adopt exactly the same structure, and the first conductive piece 400 and the second conductive piece 500 are centrally symmetric with respect to the center of the plane composed of the first direction X and the second direction Y of the battery piece 100, so that only one kind of conductive piece needs to be set to meet the needs of the first conductive piece 400 and the second conductive piece 500, which is conducive to reducing the required types of parts.

[0073] As Figure 3 shown, the battery piece interconnection structure adopting the above-mentioned implementation has the internal current flowing from Figure 3The back electrode 120 of the middle left battery piece 100 flows into the front electrode 110 of the battery piece 100, then the current flows into the first segment 410 of the middle battery piece 100 through the third segment 510 of the left battery piece 100, and further flows into the back electrode 120 of the middle battery piece 100; then, the current flows from the back electrode 120 of the middle battery piece 100 into the front electrode 110 of the battery piece 100, the current flows into the first segment 410 of the right battery piece 100 through the third segment 510 of the middle battery piece 100, and further flows into the back electrode 120 of the right battery piece 100, and then flows into the front electrode 110 of the right battery piece 100 through the back electrode 120 of the right battery piece 100. The above-mentioned rule is followed to flow into the next connected battery piece 100 one by one.

[0074] Please continue to refer to Figures 4-6 In another possible embodiment, along the first direction X, the battery piece 100 is electrically connected to the third segment 510 of the adjacent another battery piece 100 through the first segment 410 of the battery piece 100 away from the second segment 420. At this time, the structure of the first conductive sheet 400 and the structure of the second conductive sheet 500 on the adjacent two battery pieces 100 can be the same or different, as long as the projection of the first segment 410 and the projection of the third segment 510 at least partially overlap in the plane perpendicular to the first direction X.

[0075] The size of the first segment 410 and the size of the third segment 510 in the embodiment can be set as needed. Exemplarily, along the first direction X, the length of the first segment 410 can be equal to two-thirds of the length of the first side, and the length of the third segment 510 can be equal to one-third of the length of the first side; or, the length of the first segment 410 and the length of the third segment 510 can be equal, both of which can be equal to half of the length of the first side. Along the second direction Y, the length of the first segment 410 can be equal to the length of the third segment 510; or, the length of the first segment 410 can be greater than the length of the third segment 510; or, the length of the first segment 410 can be less than the length of the third segment 510. Along the third direction Z, the length of the first segment 410 can be equal to half of the length of the first side, and the length of the third segment 510 can be equal to two-thirds of the length of the first side; or, the length of the first segment 410 and the length of the third segment 510 can be equal, both of which can be equal to the length of the first side, thereby increasing the electrical connection area of the adjacent two battery pieces 100.

[0076] Compared with Figures 1-3In the embodiment, this embodiment not only reduces the materials required for the first conductive sheet 400 and the second conductive sheet 500, thereby reducing the material cost; it also further reduces the gap between two adjacent battery cells 100 (reducing the thickness of one conductive sheet), thereby facilitating further increasing the arrangement density of the battery cells 100 and improving the power generation capacity of the photovoltaic module.

[0077] Furthermore, the first conductive sheet 400 and the second conductive sheet 500 on the same battery cell 100 can adopt exactly the same structure. The first conductive sheet 400 and the second conductive sheet 500 are symmetrical with respect to the center of the plane formed by the battery cell 100 in the first direction X and the second direction Y. In this way, only one conductive sheet is required to meet the requirements of the first conductive sheet 400 and the second conductive sheet 500 at the same time, which is conducive to reducing the number of required components.

[0078] like Figure 6 As shown, the battery cell interconnection structure of the above embodiment is adopted, and the internal current is from Figure 6 The back electrode 120 of the left battery cell 100 flows into the front electrode 110 of that battery cell 100, and then the current flows into the first segment 410 of the middle battery cell 100 through the third segment 510 of the left battery cell 100, and further flows into the back electrode 120 of the middle battery cell 100; then, the current flows from the back electrode 120 of the middle battery cell 100 into the front electrode 110 of that battery cell 100, and then flows into the first segment 410 of the right battery cell 100 through the third segment 510 of the middle battery cell 100, and further flows into the back electrode 120 of the right battery cell 100, and then flows into the front electrode 110 of the right battery cell 100 through the back electrode 120 of the right battery cell 100. The current flows into the next connected battery cell 100 one by one according to the above rules.

[0079] In other possible implementations, the battery cell 100 may be electrically connected to the third segment 510 of another adjacent battery cell 100 via the first segment 410 along the third direction Z. In this case, the structures of the first conductive sheet 400 and the second conductive sheet 500 on the two adjacent battery cells 100 may be the same or different, as long as the projection of the first segment 410 and the projection of the third segment 510 at least partially overlap in a plane perpendicular to the third direction Z.

[0080] The size of the first segment 410 and the size of the third segment 510 in the first embodiment can be set as required. Exemplarily, in the first direction X, the length of the first segment 410 can be equal to two-thirds of the length of the first side, and the length of the third segment 510 can be equal to half of the length of the first side; or the length of the first segment 410 can be equal to one-third of the length of the first side, and the length of the third segment 510 can be equal to three-fourths of the length of the first side, as long as the sum of the length of the first segment 410 and the length of the third segment 510 is greater than the length of the first side. In the second direction Y, the length of the first segment 410 can be equal to the length of the third segment 510; or the length of the first segment 410 can be greater than the length of the third segment 510; or the length of the first segment 410 can be less than the length of the third segment 510. In the third direction Z, the length of the first segment 410 can be equal to one-third of the length of the first side, and the length of the third segment 510 can be equal to two-thirds of the length of the first side; or the length of the first segment 410 and the length of the third segment 510 can be equal, both of which can be equal to half of the length of the first side, thereby increasing the electrical connection area of the two adjacent battery pieces 100.

[0081] Compared with the implementation in the first aspect, the implementation in the second aspect not only reduces the material required by the first conductive piece 400 and the second conductive piece 500 and reduces the material cost, but also further reduces the gap between the two adjacent battery pieces 100 (reduces the thickness of one conductive piece), thereby facilitating further improvement of the arrangement density of the battery pieces 100 and improvement of the power generation of the photovoltaic module. Figures 1-3

[0082] Further, the first conductive piece 400 and the second conductive piece 500 on the same battery piece 100 can adopt the same structure, and the first segment 410 and the third segment 510 can be staggered in the third direction Z. The first conductive piece 400 and the second conductive piece 500 are centrally symmetric with respect to the plane composed of the first direction X and the second direction Y of the battery piece 100, so that only one kind of conductive piece needs to be set to meet the requirements of the first conductive piece 400 and the second conductive piece 500, thereby facilitating reduction of the required types of parts.

[0083] In the embodiment, the battery piece 100 is welded with the third segment 510 of the adjacent another battery piece 100 through the first segment 410 to realize electrical connection, and the welding manner can ensure the stability of the electrical connection between the adjacent battery pieces 100.

[0084] ​In this embodiment, the first conductive sheet 400 and the second conductive sheet 500 are each independently a tin-coated copper sheet, a lead-containing tin-coated copper sheet, or a silver-containing tin-coated copper sheet. The tin-coated copper sheet is a copper sheet coated with a tin layer on the surface of the copper sheet, so as to facilitate the soldering connection of the first conductive sheet 400 and the second conductive sheet 500. The lead-containing tin-coated copper sheet is a copper sheet coated with a tin-lead alloy coating on the surface of the copper sheet, thereby providing good solderability and corrosion resistance. The silver-containing tin-coated copper sheet is a copper sheet coated with a tin-silver alloy coating on the surface of the copper sheet, thereby providing good electrical conductivity, corrosion resistance, and solderability.

[0085] In this embodiment, the thickness of the first conductive sheet 400 can be 50-500 μm; and / or, the thickness of the second conductive sheet 500 can be 50-500 μm. Preferably, the first conductive sheet 400 and the second conductive sheet 500 adopt the same structure, and thus the thicknesses of the two can be the same.

[0086] In this embodiment, the first insulating layer 200 and the second insulating layer 300 are each independently a polyethylene terephthalate (PET) layer, an ethylene-tetrafluoroethylene (ETFE) layer, an ethylene-chlorotrifluoroethylene copolymer (ECTFE) layer, a polymethylpentene (TPX) layer, a cyclic olefin copolymer (COC) layer, a polybutylene terephthalate (PBT) layer, a polypropylene (PP) layer, or a polycarbonate (PC) layer. Preferably, the first insulating layer 200 and the second insulating layer 300 can be made of the same material, thereby facilitating the reduction of the amount of material required.

[0087] In this embodiment, the thickness of the first insulating layer 200 can be 50-400 μm; and / or, the thickness of the second insulating layer 300 can be 50-400 μm. Preferably, the thicknesses of the first insulating layer 200 and the second insulating layer 300 can be the same.

[0088] Please continue to refer to Figure 7In the embodiment, the front electrode 110 includes a plurality of positive electrode ribbons 111 extending along the second direction Y, and the plurality of positive electrode ribbons 111 are arranged at intervals along the third direction Z. The fourth section 520 is provided with a plurality of positive electrode pads 521, and the plurality of positive electrode pads 521 correspond to the plurality of positive electrode ribbons 111 one by one and are electrically connected, for example, by welding. The plurality of positive electrode ribbons 111 can guide current from one end of the front electrode 110 to the fourth section 520 of the second conductive sheet 500.

[0089] Correspondingly, the back electrode 120 includes a plurality of negative electrode ribbons extending along the second direction Y, and the plurality of negative electrode ribbons are arranged at intervals along the third direction Z. The second section 420 is provided with a plurality of negative electrode pads, and the plurality of negative electrode pads correspond to the plurality of negative electrode ribbons one by one and are electrically connected, for example, by welding. The plurality of negative electrode ribbons can guide current from one end of the back electrode 120 to the second section 420 of the first conductive sheet 400.

[0090] For example, the number of the positive electrode ribbons 111 and the negative electrode ribbons of the embodiment can be less than or equal to 20. The projections of the positive electrode pads and the negative electrode pads in the plane perpendicular to the first direction X can each be a square, and the side length of the square can be 50-1000 μm. The size of the positive electrode pads and the negative electrode pads in the first direction X can be 10-200 μm.

[0091] The embodiment also provides a photovoltaic module including a front plate, a front encapsulation adhesive film, the above-mentioned cell interconnection structure, a back encapsulation adhesive film, and a back plate arranged in layers.

[0092] Specifically, after the front plate, the front encapsulation adhesive film, the cell interconnection structure, the back encapsulation adhesive film, and the back plate are sequentially arranged in layers, the components can be integrated by a laminating process, and then a photovoltaic module can be formed by connecting a junction box, edge cutting, and frame mounting. It can be understood that the photovoltaic module of the embodiment has a high arrangement density of the cells due to the use of the cell interconnection structure of the above-mentioned embodiment, which is beneficial to improve the power generation of the photovoltaic module.

[0093] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, 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 devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0094] In the present application, unless specifically defined otherwise, the terms "mounting", "connection", "connecting", "fixed", and like terms should be construed in a broad sense and, for example, can be fixed connection, detachable connection, or integral; can be direct connection, or indirect connection through an intermediate medium; can be internal connection of two elements, or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0095] It should be noted that in the description of the present application, the terms "first", "second" are only used for the convenience of describing different parts, and cannot be understood as indicating or implying the order relationship, relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features.

[0096] The embodiments or implementations in the present application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other.

[0097] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0098] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery cell interconnection structure, characterized by, The application relates to a battery piece (100) comprising: at least two adjacent battery pieces (100), the battery piece (100) comprising a front electrode (110) and a back electrode (120) oppositely arranged along a first direction, the front electrode (110) and the back electrode (120) being opposite in polarity; the battery piece (100) further comprising a first side and a second side oppositely arranged along a second direction; a first insulating layer (200) arranged on the first side; a second insulating layer (300) arranged on the second side; a first conductive piece (400) electrically connected with the back electrode (120), and the first conductive piece (400) is insulatedly connected with the first side through the first insulating layer (200); a second conductive piece (500) electrically connected with the front electrode (110), and the second conductive piece (500) is insulatedly connected with the second side through the second insulating layer (300); wherein the battery piece (100) is electrically connected with the second conductive piece (500) of another adjacent battery piece (100) through the first conductive piece (400).

2. The cell interconnection structure according to claim 1, wherein, The first conductive piece (400) comprises a first segment (410) and a second segment (420) connected with each other, the first segment (410) is located on the first insulating layer (200), and the second segment (420) is electrically connected with the back electrode (120); The second conductive piece (500) comprises a third segment (510) and a fourth segment (520) connected with each other, the third segment (510) is located on the second insulating layer (300), and the fourth segment (520) is electrically connected with the front electrode (110); The battery piece (100) is electrically connected with the third segment (510) of another adjacent battery piece (100) through the first segment (410).

3. The cell interconnection structure according to claim 2, wherein Along the second direction, the battery piece (100) is electrically connected with the third segment (510) of another adjacent battery piece (100) through the side of the first segment (410) away from the first insulating layer (200).

4. The cell interconnection structure according to claim 3, wherein In a plane perpendicular to the second direction, the projection of the first segment (410) and the projection of the third segment (510) at least partially coincide.

5. The cell interconnection structure of claim 2, wherein, Along the first direction, the battery piece (100) is electrically connected with the third segment (510) of another adjacent battery piece (100) through the end of the first segment (410) away from the second segment (420).

6. The cell interconnection structure according to claim 5, wherein In a plane perpendicular to the first direction, the projection of the first segment (410) and the projection of the third segment (510) at least partially coincide.

7. The cell interconnection structure of claim 2, wherein Along a third direction, the battery piece (100) is electrically connected with the third segment (510) of another adjacent battery piece (100) through the first segment (410).

8. The cell interconnection structure according to claim 7, wherein, In the third direction, the first segments (410) are staggered with the third segments (510); and in a plane perpendicular to the third direction, a projection of the first segments (410) at least partially coincides with a projection of the third segments (510).

9. The cell interconnection structure according to any one of claims 1-8, wherein, The first conductive tab (400) and the second conductive tab (500) are each independently a tin-coated copper tab, a lead-containing tin-coated copper tab, or a silver-containing tin-coated copper tab.

10. The cell interconnection structure according to any one of claims 1-8, wherein, The first conductive tab (400) has a thickness of 50-500 μm. The second conductive tab (500) has a thickness of 50-500 μm.

11. The cell interconnection structure according to any one of claims 1-8, wherein, The first insulating layer (200) and the second insulating layer (300) are each independently a polyethylene terephthalate layer, an ethylene-tetrafluoroethylene copolymer layer, an ethylene-chlorotrifluoroethylene copolymer layer, a polymethylpentene layer, a cyclic olefin copolymer layer, a polybutylene terephthalate layer, a polypropylene layer, or a polycarbonate layer.

12. The cell interconnection structure according to any one of claims 1-8, wherein, The first insulating layer (200) has a thickness of 50-400 μm. The second insulating layer (300) has a thickness of 50-400 μm.

13. The cell interconnection structure according to any one of claims 2-8, wherein, The front electrode (110) includes a plurality of positive electrode solder strips (111) extending in the second direction, and the plurality of positive electrode solder strips (111) are spaced apart in the third direction; the fourth segment (520) is provided with a plurality of positive electrode pads (521), and the plurality of positive electrode pads (521) correspond one-to-one to the plurality of positive electrode solder strips (111) and are electrically connected thereto. The back electrode (120) includes a plurality of negative electrode solder strips extending in the second direction, and the plurality of negative electrode solder strips are spaced apart in the third direction; the second segment (420) is provided with a plurality of negative electrode pads, and the plurality of negative electrode pads correspond one-to-one to the plurality of negative electrode solder strips and are electrically connected thereto.

14. A photovoltaic module, characterized by, The battery cell includes a front plate, a front encapsulation adhesive film, a battery cell interconnection structure as claimed in any one of claims 1-13, a back encapsulation adhesive film, and a back plate.

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