A photovoltaic module and a preparation method thereof

Abstract

The present invention discloses a photovoltaic module and a preparation method thereof. The photovoltaic module includes: a backsheet, a plurality of cell strings arranged side by side on the backsheet, a first conductive sheet disposed at the first end of each cell string, and multiple electrode lead-out structures, wherein each cell string includes a plurality of electrically connected cell wafers, and the cell wafers located at the first end and the second end of the cell string are a first cell wafer and a second cell wafer respectively; the first conductive sheet is disposed on the front side of the first cell wafer of the cell string where it is located; the back side of the first conductive sheet has conductivity, and the front appearance of the first conductive sheet is the same as the front appearance of the cell wafer or the front appearance of the backsheet, and the back side of the first conductive sheet is electrically connected to the front electrode of the first cell wafer; the back sides of the multiple first conductive sheets and the multiple second cell wafers are electrically connected through the multiple electrode lead-out structures to achieve series connection and / or parallel connection of the multiple cell strings. The photovoltaic module has aesthetics.

Description

Technical Field

[0001] The present invention relates to a photovoltaic module and a method for manufacturing the same. Background Art

[0002] With the increasingly wide application of photovoltaics, the requirements for photovoltaic modules are not only to improve the power generation capacity, but also to have an attractive appearance. For example, building integrated photovoltaic (BIPV) modules are typical products that represent the improvement of the appearance of photovoltaic modules. In a photovoltaic module, the connection between the cells in the same string of cells is achieved through interconnection bars, and the connection between adjacent cell strings is achieved through a bus bar connected to the tails of the interconnection bars disposed on the cells at the head and tail ends of the cell string. At this time, the tails of the interconnection bars disposed on the cells at the head and tail ends of the cell string and the bus bar are exposed outside the cell string area, resulting in an unattractive appearance of the module. Therefore, hiding the interconnection bars and bus bars exposed outside the cell string area helps to improve the appearance of the photovoltaic module.

[0003] Currently, the conventional method for hiding the bus bar is to bend the tails of the interconnection bars disposed on the head / tail cells of the cell string, so as to bend the tails of the interconnection bars and the connected interconnection bars to the back of the cell, that is, to hide the interconnection bars and the bus bar at the tail of the cell string.

[0004] In the process of implementing the present invention, the inventors found that there are at least the following problems in the prior art:

[0005] In the process of bending the interconnection bars, the cells are easily damaged. In addition, the bending treatment of the tails of the interconnection bars causes the bent interconnection bars to form protrusions on the back of the cell. Then, after the photovoltaic module is laminated, the protrusions formed by the interconnection bars on the back of the cell are likely to cause the backsheet to bulge, resulting in a low mass production yield. Summary of the Invention

[0006] In view of this, the technical problem to be solved by the present invention is to provide a photovoltaic module and a method for manufacturing the same, which can maintain the beautiful appearance of the photovoltaic module while having a high industrial production efficiency and a high production yield due to the simple structure of the photovoltaic module.

[0007] To solve the above technical problems, the present invention provides the following technical solutions:

[0008] In a first aspect, the present invention provides a photovoltaic module, comprising:

[0009] A backsheet;

[0010] A plurality of battery strings arranged side by side on the backplane, each battery string including a plurality of battery cells electrically connected to each other, wherein the battery cells located at the first end and the second end of the battery string are a first battery cell and a second battery cell respectively;

[0011] A first conductive sheet disposed on the front surface of the first battery cell of each battery string; and,

[0012] Multiple electrode lead-out structures;

[0013] Wherein,

[0014] The back surface of the first conductive sheet has conductivity, and the front appearance of the first conductive sheet is the same as the front appearance of the battery cell or the front appearance of the backplane, and the back surface of the first conductive sheet is electrically connected to the front electrode of the first battery cell;

[0015] The back surfaces of the plurality of first conductive sheets and the plurality of second battery cells are electrically connected through the plurality of electrode lead-out structures.

[0016] In a second aspect, the present invention provides a method for manufacturing a photovoltaic module, including:

[0017] Steps of manufacturing battery strings;

[0018] Electrically connecting the back surface of the first conductive sheet to the front electrode of the first battery cell at the first end of one battery string, wherein the back surface of the first conductive sheet has conductivity, and the front appearance of the first conductive sheet is the same as the front appearance of the battery cells included in the battery string or the front appearance of the backplane included in the photovoltaic module;

[0019] Electrically connecting the back surfaces of the plurality of first conductive sheets and the back surfaces of the second battery cells at the second ends of the plurality of battery strings through the plurality of electrode lead-out structures to achieve series connection and / or parallel connection of the plurality of battery strings.

[0020] The technical solution of the first aspect of the above invention has the following advantages or beneficial effects: Since the back surface of the first conductive sheet electrically connected to the front surface of the first solar cell at the first end of multiple battery strings and the back surfaces of the second solar cells at the second ends of multiple battery strings are electrically connected through a multi-segment electrode lead-out structure, wherein the back surface of each first conductive sheet has conductivity, the multiple battery strings included in the photovoltaic module can be connected in series or in parallel. Additionally, since the back surfaces of multiple first conductive sheets and the back surfaces of the second solar cells at the second ends of multiple battery strings are electrically connected through a multi-segment electrode lead-out structure, the multi-segment electrode lead-out structure for electrical connection is hidden on the back surfaces of multiple first conductive sheets and the back surfaces of the second ends of multiple battery strings. At the same time, the front appearance of the first conductive sheet is consistent with the front appearance of the solar cells included in the battery string or the front appearance of the backsheet included in the photovoltaic module, making the appearance on the front of the photovoltaic module consistent and ensuring the aesthetics of the photovoltaic module.

[0021] In addition, since the battery strings included in the photovoltaic module provided in this application can include only one type of solar cell, compared with the battery strings composed of two types of solar cells, the production efficiency and yield of the battery strings composed of one type of solar cell are significantly improved. Therefore, the production efficiency and yield of the photovoltaic module provided in this application can also be significantly improved. Description of the Drawings

[0022] Figure 1 is a schematic cross-sectional structure diagram of a battery string according to an embodiment of the present invention;

[0023] Figure 2 is a schematic cross-sectional structure diagram of a battery string according to the prior art;

[0024] Figure 3 is a schematic diagram of the relative positions of the front electrode and the back electrode in a solar cell according to an embodiment of the present invention;

[0025] Figure 4 is a top view of a photovoltaic module according to the prior art;

[0026] Figure 5 is a front view of a photovoltaic module according to an embodiment of the present invention;

[0027] Figure 6 is a front view of a photovoltaic module according to another embodiment of the present invention;

[0028] Figure 7 is a front view of a photovoltaic module according to still another embodiment of the present invention;

[0029] Figure 8 is a front view of a photovoltaic module according to another embodiment of the present invention;

[0030] Figure 9 Schematic diagram of the back side of a photovoltaic module according to an embodiment of the present invention;

[0031] Figure 10 Schematic diagram of the back side of a photovoltaic module according to another embodiment of the present invention;

[0032] Figure 11 Schematic diagram of a cross-section of a photovoltaic module according to an embodiment of the present invention;

[0033] Figure 12 Schematic diagram of a cross-section of a photovoltaic module according to another embodiment of the present invention;

[0034] Figure 13 Schematic diagram of a cross-section of the ends of two adjacent overlapping string cells according to an embodiment of the present invention;

[0035] Figure 14 Schematic diagram of a cross-section of the ends of two adjacent overlapping string cells according to another embodiment of the present invention;

[0036] Figure 15 Schematic diagram of a cross-section of the ends of two adjacent overlapping string cells according to yet another embodiment of the present invention;

[0037] Figure 16 Schematic diagram of a cross-section of the ends of two adjacent overlapping string cells according to another embodiment of the present invention;

[0038] Figure 17 Schematic diagram of a cross-section of the ends of two adjacent overlapping string cells according to yet another embodiment of the present invention;

[0039] Figure 18 Schematic diagram of the back side structure of a first conductive sheet according to an embodiment of the present invention;

[0040] Figure 19 Schematic diagram of the back side structure of a first conductive sheet according to another embodiment of the present invention;

[0041] Figure 20 Front view of a second conductive sheet according to an embodiment of the present invention;

[0042] Figure 21 Back side structure of a second conductive sheet according to an embodiment of the present invention;

[0043] Figure 22 Schematic diagram of a photovoltaic module according to an embodiment of the present invention;

[0044] Figure 23 Schematic diagram of the main process of a method for manufacturing a photovoltaic module according to an embodiment of the present invention;

[0045] Figure 24 The front view of the overlapping - tile battery string connected with the first conductive sheet according to an embodiment of the present invention;

[0046] Figure 25 The schematic cross - sectional view of the overlapping - tile battery string connected with the first conductive sheet according to an embodiment of the present invention;

[0047] Figure 26 The schematic view of the back of the overlapping - tile battery string connected with the first conductive sheet according to an embodiment of the present invention;

[0048] Figure 27 The schematic view of the connection relationship between battery strings according to an embodiment of the present invention;

[0049] Figure 28 The schematic view of the circuit formed by the connection between battery strings according to an embodiment of the present invention;

[0050] Figure 29 The schematic view of the connection relationship between battery strings according to another embodiment of the present invention;

[0051] Figure 30 The schematic view of the connection relationship between battery strings according to yet another embodiment of the present invention;

[0052] Figure 31 The schematic view of the circuit formed by the connection between battery strings according to an embodiment of the present invention;

[0053] Figure 32 The schematic view of the connection relationship between battery strings according to another embodiment of the present invention.

[0054] The reference numerals are as follows:

[0055] 10 Battery string

[0056] 101 Battery cells included in the battery string

[0057] 101′ The first battery cell at the end of the first end of the battery string

[0058] 101″ The battery cell adjacent to the first battery cell / the second battery cell

[0059] 101″′ The second battery cell at the end of the second end of the battery string

[0060] 20 The first conductive sheet 201 Silicon wafer

[0061] 202 The first conductive structure

[0062] 30 Electrode lead - out structure

[0063] 40 The second conductive sheet

[0064] 401 third conductive structure 402 fourth conductive structure

[0065] 50 Cover

[0066] 60 Packaging film

[0067] 70 Back Panel DETAILED DESCRIPTION

[0068] The photovoltaic assembly involved in the embodiment of the present invention includes the front side of each component (such as Figure 1 The front side of the conductive sheet, the front side of the battery cell, the front side of the battery string, etc. shown in the figure all refer to the side of each component facing the sunlight when the photovoltaic module is working normally. Correspondingly, the front side of the photovoltaic module refers to the side of the photovoltaic module facing the sunlight when the photovoltaic module is working normally. Figure 1 The back side of the conductive sheet, the back side of the battery cell, the back side of the battery string, etc. shown in the figure all refer to the side opposite to the front side of the module and facing away from the sunlight when the photovoltaic module is working normally. Correspondingly, the back side of the photovoltaic module refers to the side opposite to the front side of the photovoltaic module and facing away from the sunlight when the photovoltaic module is working normally. It is worth noting that in the following description and the attached claims, "electrical connection" between one feature and another feature not only includes one feature directly contacting another feature to form an electric energy transmission or current transmission channel, but also includes an intermediate feature between one feature and another feature, and the one feature, the other feature and the intermediate feature therebetween form an electric energy transmission channel or a current transmission channel to achieve electric energy transmission or transmission.

[0069] The battery string may be any existing battery string structure, such as a common battery string (in which the front electrode of a battery cell is electrically connected to the back electrode of an adjacent battery cell through an interconnection strip), a shingled battery string (such as Figure 1 and Figure 2 As shown, a shingled cell string refers to a cell string in which the front electrode of one cell in every two adjacent cell sheets is electrically connected to the back electrode of the other cell sheet, and the front electrode of one cell sheet is only electrically connected to the back electrode of one cell sheet, and the back electrode of one cell sheet is only electrically connected to the front electrode of one cell sheet, and the edges of adjacent cell sheets overlap, and adjacent cell sheets are connected by conductive glue), a stacked cell string (the cell sheets in a stacked cell string are connected by welding strips, but there is no gap between the cell sheets or the edges of adjacent cell sheets overlap).

[0070] Among them, the front electrode of the battery cell refers to the electrode arranged on the front of the battery cell, which can be a positive electrode or a negative electrode. The back electrode of the battery cell refers to the electrode arranged on the back of the battery cell, which can be a positive electrode or a negative electrode. It is worth noting that the front electrode and the back electrode of the battery cell are electrodes with opposite polarities. For example, the front electrode of the battery cell is a positive electrode, and correspondingly, the back electrode of the battery cell is a negative electrode. For another example, the front electrode of the battery cell is a negative electrode, and correspondingly, the back electrode of the battery cell is a positive electrode. In addition, the front electrode of the battery cell and the back electrode of the battery cell can be one of a main grid structure electrode, a line segment electrode and a point contact electrode. In a preferred embodiment, as Figure 3 In the cross-sectional view corresponding to the wide side of the battery cell shown, the front electrode of the battery cell and the back electrode of the battery cell are respectively arranged on the front and back sides of the long sides of the battery cell, wherein the long side close to the front electrode of the battery cell and the long side close to the back electrode of the battery cell are opposite to each other, so as to facilitate the shingled operation.

[0071] The battery cell may be a conventional substantially square battery cell, or may be a small battery cell cut from a whole battery cell.

[0072] For existing photovoltaic modules including multiple battery strings, when the battery string consists of only one type of battery cell, Figure 2 and Figure 4 Taking the shingled battery string shown as an example, in order to hide the busbar that affects the surface aesthetics and light absorption rate of the photovoltaic module as much as possible, the busbar is set on the back of the battery cell, wherein one end of the welding tape is electrically connected to the front electrode of the battery cell at one end of the shingled battery string, and the other end of the welding tape is electrically connected to the busbar on the back of the battery cell after being folded. Since the back of the battery cell has a back electrode, in order to avoid the busbar from contacting the back electrode, an insulating sheet needs to be set between the busbar and the battery cell. There are bulges at the folded part of the welding tape, which can easily cause the back plate of the photovoltaic module to bulge and the battery cell to rupture after lamination. At the same time, the folding action of the welding tape can easily damage the battery cell. At the same time, the welding tape, busbar and insulating sheet need to be used together, which greatly increases the difficulty of industrialization and production. In addition, after the front electrode and busbar of the battery cell are connected by the welding tape, the welding tape will still be exposed on the front of the photovoltaic module, which will still affect the aesthetics of the photovoltaic module.

[0073] To solve the above problems, an embodiment of the present invention provides a photovoltaic module, which may include a backsheet; a plurality of cell strings arranged side by side on the backsheet (each cell string includes a plurality of electrically connected solar cells, wherein the solar cells located at the first end and the second end of the cell string are the first solar cell and the second solar cell respectively); a first conductive sheet disposed on the front surface of the first solar cell of each cell string; and multiple electrode lead-out structures. The relationship among the plurality of cell strings arranged side by side, the first conductive sheet disposed on the front surface of the first solar cell of each cell string, and the multiple electrode lead-out structures is as Figures 5 to 10 shown. Among them, Figures 5 to 8 FIG. Figures 5 to 8 shows a front top view of a photovoltaic module according to an embodiment of the present invention, Figure 9 shows Figure 5 FIG. Figure 5 shows a back bottom view of the photovoltaic module shown, Figure 10 shows Figure 8 FIG. Figure 8 shows a back bottom view of the photovoltaic module shown. According to Figures 5 to 10 shown, the relationship among the plurality of cell strings arranged side by side, the first conductive sheet of the first solar cell of each cell string, and the multiple electrode lead-out structures may include:

[0074] Each cell string 10 includes a plurality of electrically connected solar cells. Among them, the solar cells located at the first end and the second end of the cell string 10 are the first solar cell 101' and the second solar cell 101''', respectively. In the embodiment of the present invention, the current of the cell string 10 outputs from the front electrode of the first solar cell 101' and the back electrode of the second solar cell 101''', that is, the front electrode of the first solar cell 101' is no longer connected to the back electrodes of other solar cells, and the back electrode of the second solar cell 101''' is no longer connected to the front electrodes of other solar cells.

[0075] The first conductive sheet 20 is disposed on the front surface of the first solar cell 101' of the cell string 10 where it is located;

[0076] The back surface of the first conductive sheet 20 has conductivity, and the front appearance of the first conductive sheet 20 is the same as the front appearance of the solar cell or the front appearance of the backsheet 70. The back surface of the first conductive sheet 20 is electrically connected to the front electrode of the first solar cell 101';

[0077] The back surfaces of the multiple first conductive sheets 20 and the multiple second solar cells 101''' are electrically connected through multiple electrode lead-out structures 30 to achieve series connection and / or parallel connection of the multiple cell strings 10.

[0078] It should be noted that in Figures 5 to 10In order to clearly show the relationship between the various components in the photovoltaic module, taking the overlapping shingle cell string as an example, the relative positional relationship between the overlapping shingle cell string 10, the first conductive sheet 20, the second conductive sheet 40, and the electrode lead-out structure 30 is shown in the figure. Only the main components included in the overlapping shingle cell string 10, the first conductive sheet 20, the second conductive sheet 40, and the electrode lead-out structure 30 are shown, while other components are omitted.

[0079] It should be noted that in the cell string, the front electrode of the first cell 101' is electrically connected to the first conductive sheet 20, and the back electrode of the first cell 101' is electrically connected to the front electrode of the adjacent cell 101". The front electrode of the second cell 101″′ is electrically connected to the back electrode of the adjacent cell 101".

[0080] Among them, the front appearance of the first conductive sheet 20 refers to the color, pattern, structure, etc. on the front of the first conductive sheet 20; the front appearance of the cell 101 refers to the color, pattern, structure, etc. on the front of the cell 101; the front appearance of the backsheet 70 included in the photovoltaic module refers to the color, pattern, structure, etc. on the front of the backsheet 70. Correspondingly, the front appearance of the first conductive sheet 20 being consistent with the front appearance of the cell 101 included in the cell string 10 or the front appearance of the backsheet 70 included in the photovoltaic module can be: the front color of the first conductive sheet 20 being consistent with the front color of the cell 101 included in the cell string 10 or the front color of the first conductive sheet 20 being consistent with the front color of the backsheet 70 included in the photovoltaic module; it can also be: the front color and front pattern of the first conductive sheet 20 being consistent with the front color and front pattern of the cell 101 included in the cell string 10 or the front color of the first conductive sheet 20 being consistent with the front color and front pattern of the backsheet 70 included in the photovoltaic module.

[0081] In the photovoltaic module provided in the above embodiment, since the backs of multiple first conductive sheets and the backs of the second cells at the second ends of multiple cell strings are electrically connected through multiple electrode lead-out structures, where each back of the first conductive sheet has conductivity and each back of the first conductive sheet is electrically connected to the front electrode of the first cell at the first end of a cell string, the multiple cell strings included in the photovoltaic module, such as overlapping shingle cell strings, can be connected in series and / or in parallel. In addition, since the backs of multiple first conductive sheets and the backs of multiple cell strings, such as overlapping shingle cell strings, at the second ends are electrically connected through multiple electrode lead-out structures, the multiple electrode lead-out structures for electrical connection are hidden on the backs of multiple first conductive sheets and the backs of the second ends of multiple cell strings. At the same time, the appearance of the front of the first conductive sheet is consistent with the appearance of the front of the cells included in the cell string, making the appearance of the front of the photovoltaic module consistent and ensuring the aesthetics of the photovoltaic module.

[0082] In addition, since the shingled battery string included in the photovoltaic module provided in this application may include only one type of cell, compared with the battery string composed of two types of cells, the production efficiency and yield rate of the battery string composed of one type of cell are significantly improved. Therefore, the production efficiency and yield rate of the photovoltaic module provided in this application can also be significantly improved. Among them, the yield rate refers to the percentage of qualified photovoltaic modules among a certain number of photovoltaic modules produced during the production process of the photovoltaic module.

[0083] In addition, in the photovoltaic module provided in this application, adjacent two battery strings such as shingled battery strings are electrically connected through a multi-segment electrode lead-out structure, and the multi-segment electrode lead-out structure is directly on the back of the battery string, such as the back of the shingled battery string, without folding or bending, as much as possible to ensure the flatness of multiple series-connected or parallel-connected battery strings such as shingled battery strings, and ensure the flatness of the lamination of the photovoltaic module.

[0084] Among them, the back surfaces of multiple first conductive sheets 20 and the back surfaces of the second cells at the second ends of multiple battery strings 10 are electrically connected through a multi-segment electrode lead-out structure 30. The implementation manners for realizing the series connection or parallel connection of multiple battery strings 10 can be as follows.

[0085] As Figure 6 、 Figure 8 and Figure 10 shown, taking the shingled battery string as an example, there are two ways to connect two adjacent battery strings in series.

[0086] The first series connection method, as Figure 6As shown in the figure, for two adjacent overlapping cell strings 10, the first conductive sheet 20 of one overlapping cell string 10 is correspondingly arranged with the second cell sheet 101″′ at the second end of the other overlapping cell string 10; the back of the first conductive sheet 20 of one overlapping cell string 10 and the back of the second cell sheet 101″′ of the other cell string 10 are electrically connected through at least one electrode lead-out structure 30 to realize the series connection of two adjacent overlapping cell strings 10. Among them, the corresponding arrangement of the first conductive sheet 20 electrically connected to one end of one overlapping cell string 10 and the second cell sheet 101″′ at the second end of the other overlapping cell string 10 means that the first conductive sheet 20 electrically connected to the first cell sheet 101′ at the first end of one overlapping cell string 10 and the second cell sheet 101″′ at the second end of the other overlapping cell string 10 are located on the same side of the photovoltaic module, and one side of the first conductive sheet 20 electrically connected to the first cell sheet 101′ at the first end of one overlapping cell string 10 is opposite to one side of the second cell sheet 101″′ at the second end of the other overlapping cell string 10. One side of the first conductive sheet 20 refers to the plane formed by two parallel wide sides in the first conductive sheet 20 and the side in the thickness direction of the first conductive sheet 20; one side of the second cell sheet 101″′ refers to the plane formed by two parallel wide sides in the second cell sheet 101″′ and the side in the thickness direction of the second cell sheet 101″′. Among them, the thickness direction refers to the direction perpendicular to the surface (front or back) of the photovoltaic module when the photovoltaic module is working properly.

[0087] The second series connection method is as Figure 8 and Figure 10 shown. The series connection is realized through the second conductive sheet 40 arranged on the back of the second cell sheet. Specifically, in two adjacent cell strings 10, the first conductive sheet 20 of one cell string 10 is correspondingly arranged with the second conductive sheet 40 arranged at the second end of the other cell string 10; the back of the first conductive sheet 20 of one cell string 10 and the back of the second conductive sheet of the other cell string 10 are electrically connected through the electrode lead-out structure 30 to realize the series connection of two adjacent cell strings 10. Among them, the conductivity of the second conductive sheet 40 extends from the front to the back; the front appearance of the second conductive sheet 40 is the same as the front appearance of the cell sheet 101 or the front appearance of the backplane 70; the front of the second conductive sheet 40 is electrically connected to the back electrode of the second cell sheet 101″′ of the cell string 10 where it is located, so that the second cell sheet 101″′ is electrically connected to the electrode lead-out structure 30 through the second conductive sheet 40.

[0088] As Figure 5 , Figure 7 and Figure 9 shown, taking the overlapping cell string as an example, there are two ways to connect two adjacent cell strings in parallel.

[0089] As Figure 5 shown in the first parallel connection method. For two adjacent overlapping tile - type battery strings 10, the first conductive sheets 20 of one battery string 10 and the first conductive sheets 20 of the other battery string 10 are correspondingly arranged; the back surfaces of the first conductive sheets 20 of one battery string 10 and the back surfaces of the first conductive sheets 20 of the other battery string 10 are electrically connected through at least one section of electrode lead - out structure 30; the back surfaces of the second battery sheets 101″′ of one battery string 10 and the back surfaces of the second battery sheets 101″′ of the other battery string 10 are electrically connected through at least one section of electrode lead - out structure 30, so as to realize the parallel connection of two adjacent battery strings 10.

[0090] Among them, the corresponding arrangement of the first conductive sheet 20 of one battery string 10 and the first conductive sheet 20 of the other battery string 10 means that the first conductive sheet 20 electrically connected to the first end of one battery string 10 and the first conductive sheet 20 electrically connected to the first end of the other battery string 10 are located on the same side of the photovoltaic module, and one side surface of the first conductive sheet 20 electrically connected to the first end of one battery string 10 is opposite to one side surface of the first conductive sheet 20 electrically connected to the first end of the other battery string 10. The corresponding arrangement of the second battery sheet 101″′ of one battery string 10 and the second battery sheet 101″′ of the other battery string 10 means that the second battery sheet 101″′ at the second end of one battery string 10 and the second battery sheet 101″′ at the second end of the other overlapping tile - type battery string 10 are located on the same side of the photovoltaic module, and one side surface of the second battery sheet 101″′ at the second end of one overlapping tile - type battery string 10 is opposite to one side surface of the second battery sheet 101″′ at the second end of the other overlapping tile - type battery string 10.

[0091] As Figure 7 and Figure 9 shown in the second parallel connection method is realized by adding a second conductive sheet 40 electrically connected to the second battery sheet. Specifically, for two adjacent battery strings 10, the first conductive sheet 20 of one battery string 10 and the first conductive sheet 20 of the other battery string 10 are correspondingly arranged; the second conductive sheet 40 of one battery string 10 and the second conductive sheet 40 of the other battery string 10 are correspondingly arranged; the back surface of the first conductive sheet 20 of one battery string 10 and the back surface of the first conductive sheet 20 of the other battery string 10 are electrically connected through the electrode lead - out structure 30; the back surface of the second conductive sheet 40 of one battery string 10 and the back surface of the second conductive sheet 40 of the other battery string 10 are electrically connected through the electrode lead - out structure 30, so as to realize the parallel connection of two adjacent battery strings 10.

[0092] Wherein, the front appearance of the first conductive sheet 20 being consistent with the front appearance of the cell 101 included in the overlapping shingle type battery string 10 or the front appearance of the backsheet 70 included in the photovoltaic module means that the color of the front of the first conductive sheet 20 is consistent with the color of the front of the cell 101 or the front color of the backsheet 70 included in the photovoltaic module. The implementation method can be: on the front of the first conductive sheet 20, a coating with the same color as the front of the cell 101 is provided, or, on the front of the first conductive sheet 20, a coating with the same color as the front of the backsheet 70 included in the photovoltaic module is provided. In a preferred embodiment, the front of the first conductive sheet 20 has the same pattern as the front of the cell 101, or, the front of the first conductive sheet 20 has the same pattern as the front of the backsheet 70 included in the photovoltaic module, so as to further maintain the consistency between the front of the first conductive sheet 20 and the front of the cell 101 or maintain the consistency between the front of the backsheet 70 and the front of the cell 101, and better maintain the aesthetics of the photovoltaic module.

[0093] The above implementation methods for connecting two adjacent overlapping shingle type battery strings 10 in series or in parallel are not only simple to operate and easy for industrial production, but also can hide the electrode lead-out structure on the back of the overlapping shingle type battery string, meeting the aesthetic requirements of the photovoltaic module.

[0094] It should be noted that multiple first conductive sheets 20 and / or multiple second cells (or second conductive sheets) on the same side of the photovoltaic module can be electrically connected through the same electrode lead-out structure to realize the series connection and / or parallel connection of multiple battery strings in the photovoltaic module. For example, in the case of multiple battery strings connected in parallel, multiple first conductive sheets 20 on one side of the photovoltaic module can be electrically connected through one electrode lead-out structure, and multiple conductive components on the other side of the photovoltaic module can be electrically connected through another electrode lead-out structure. Another example is the case of multiple battery strings connected in series. Multiple first conductive sheets 20 and multiple second cells (or second conductive sheets) arranged side by side on one side of the photovoltaic module can be electrically connected through one electrode lead-out structure, and multiple first conductive sheets 20 and multiple second cells (or second conductive sheets) on the other side of the photovoltaic module can be electrically connected through another electrode lead-out structure.

[0095] In an embodiment of the present invention, a specific implementation structure in which the back of the above-mentioned multiple first conductive sheets 20 and the back of the second cells at the second ends of multiple battery strings 10 are electrically connected through multiple electrode lead-out structures 30 is as Figure 11 and Figure 12 shown in the cross-sectional view of the overlapping shingle type battery string 10. From Figure 11 and Figure 12 it can be seen that each section of the electrode lead-out structure 30 is electrically connected to the back of a first conductive sheet 20 or the back of a second cell or a second conductive sheet connected to the second cell; as Figures 13 to 17Cross-sectional view of the ends of two adjacent overlapping tile-type battery strings 10 shown, with every two adjacent electrode lead-out structures 30 electrically connected.

[0096] Among them, the electrical connection of every two adjacent electrode lead-out structures 30 can refer to, as Figure 13 shown, the electrode lead-out structure 30 disposed on the back of the first conductive sheet 20 corresponding to one overlapping tile-type battery string 10 is electrically connected to the electrode lead-out structure 30 disposed on the back of the first conductive sheet 20 corresponding to another adjacent overlapping tile-type battery string 10; as Figure 14 and Figure 15 shown, the electrode lead-out structure 30 disposed on the back of the conductive component in one overlapping tile-type battery string 10 is connected to the electrode lead-out structure 30 disposed on the back of the conductive component in another adjacent overlapping tile-type battery string 10. Figure 13 Connected with Figure 14 or Figure 15 Combined to achieve parallel connection of two adjacent overlapping tile-type battery strings 10.

[0097] The electrical connection of every two adjacent electrode lead-out structures 30 can also refer to, as Figure 16 and Figure 17 shown, at the first end and the second end of two adjacent battery strings (the first end is the end where the first conductive sheet is located, and the second end is the end where the second battery sheet or the second conductive sheet is located), there are respectively: the electrode lead-out structure 30 disposed on the back of the first conductive sheet 20 in one battery string 10 and the electrode lead-out structure 30 disposed on the back of the second battery sheet or the second conductive sheet in another adjacent battery string 10. The electrode lead-out structure 30 disposed on the back of the second battery sheet or the second conductive sheet in one battery string 10 is electrically connected to the electrode lead-out structure 30 disposed on the back of the first conductive sheet 20 in another adjacent battery string 10 to achieve parallel connection of two adjacent overlapping tile-type battery strings 10.

[0098] Among them, the electrical connection of every two adjacent electrode lead-out structures 30 can be achieved by welding, conductive glue, conductive tape, etc. to connect the two adjacent electrode lead-out structures 30, realizing the electrical connection of the two adjacent electrode lead-out structures 30. Connecting the two adjacent electrode lead-out structures 30 is relatively easy to operate and implement, which is beneficial to industrial production. In addition, since connecting the two adjacent electrode lead-out structures 30 does not directly contact the battery cells in the overlapping tile-type battery string 10, the risk of battery cell microcracks can be reduced, effectively improving the production yield of the photovoltaic module.

[0099] In summary, the second end of the battery string can have the following two structures.

[0100] As Figure 12 shown by the cross-sectional view of the overlapping tile-type battery string 10, the first structure of the second end of the overlapping tile-type battery string 10:

[0101] As shown Figure 12 in the figure, the second cell 101″′ is disposed at the second end of the shingled cell string 10; a back electrode is provided on the back surface of the second cell 101″′ at the second end of the shingled cell string 10.

[0102] As Figure 11 can be seen from the cross-sectional view of the shingled cell string 10 shown in the figure, the second structure at the second end of the cell string 10:

[0103] The second end of the cell string 10 further includes a second conductive sheet 40 electrically connected to the second cell 101″′. Among them, the conductivity of the second conductive sheet 40 extends from the front surface to the back surface; the appearance of the front surface of the second conductive sheet 40 is the same as the appearance of the front surface of the cell 101 or the appearance of the front surface of the backsheet 70 included in the photovoltaic module; the front surface of the second conductive sheet 40 is electrically connected to the back electrode of the second cell 101″′ of the cell string 10 where it is located. Among them, the back electrode electrically connected to the second conductive sheet 40 is not electrically connected to the adjacent cell 101″.

[0104] Among them, the appearance of the front surface of the second conductive sheet 40 is the same as the appearance of the front surface of the cell 101 or the appearance of the front surface of the backsheet 70 included in the photovoltaic module. Specifically, the color of the front surface of the second conductive sheet 40 is the same as the color of the front surface of the cell 101 or the color of the front surface of the backsheet 70 included in the photovoltaic module. The implementation method can be: a coating with the same color as the front surface of the cell 101 is provided on the front surface of the second conductive sheet 40, or a coating with the same color as the front surface of the backsheet 70 included in the photovoltaic module is provided on the front surface of the second conductive sheet 40. In a preferred embodiment, the front surface of the second conductive sheet 40 has the same pattern as the front surface of the cell 101, or the front surface of the second conductive sheet 40 has the same pattern as the front surface of the backsheet 70 included in the photovoltaic module, so as to further maintain the consistency between the front surface of the second conductive sheet 40 and the front surface of the cell 101 or the consistency between the front surface of the second conductive sheet 40 and the front surface of the backsheet 70 included in the photovoltaic module, and better maintain the aesthetics of the photovoltaic module.

[0105] Among them, the front surface of the second conductive sheet 40 is electrically connected to the back electrode of the cell 101″′ at the second end of the shingled cell string 10 where it is located through a conductive medium. The conductive medium can be conductive glue, conductive tape, etc.

[0106] It should be noted that the electrode lead-out structure 30 in each of the above embodiments may include any one or a combination of a solder strip, a bus bar, and a conductive structure made of the main grid material of the cell. The main grid material of the cell refers to the material used to make the main grid of the cell, such as conductive metal materials such as silver and gold.

[0107] In addition, the electrode lead-out structure can be of any shape, as long as it can achieve the conduction of the battery string, and no limitation is made here. For example, a strip structure, or an "H"-shaped conductive structure made of the main grid material of the battery cell, a "square" structure, etc. (wherein, the two sides of the "H"-shaped conductive structure or the "square" structure are respectively arranged on the back of the first conductive sheet or the second conductive sheet close to the two long sides, and the middle connecting section connecting the two sides of the "H"-shaped conductive structure or the two connecting sections connecting the two sides up and down of the "square" structure can be a welding tape, a bus bar or made of the main grid material of the battery cell), and also, Figure 26 the hollow structure shown, etc.

[0108] In addition, the structure of the first conductive sheet or the second conductive sheet can also be similar to the structure of the battery cells used in the battery string, but its width is smaller than that of other battery cells in the battery string. At the same time, the back of the conductive sheet has a conductive structure made of the main grid materials of two battery cells with the same polarity, and the two main grids are connected (that is, the aforementioned "H"-shaped conductive structure or "square" structure). Then, one main grid is used to connect adjacent overlapping battery cells, and the other main grid is used to connect the welding tape. Such a first conductive sheet or a second conductive sheet is formed by simply processing an ordinary battery cell (that is, cutting and narrowing, and there is an additional main grid on the back). Although it has the ability to generate electricity, as a conductive sheet, its power generation function is discarded. This type of conductive sheet has the advantages of simple production and no need for special production.

[0109] In the embodiment provided by the present invention, the first conductive sheet 20 and / or the second conductive sheet 40 are conductive sheets prepared from conductive materials, such as metal foils such as iron sheets, copper sheets, and aluminum sheets.

[0110] In the embodiment of the present invention, as Figure 18 and Figure 19 shown in the back structure of the first conductive sheet 20, the first conductive sheet 20 may include: a silicon wafer 201 and a first conductive structure 202 arranged on the back of the silicon wafer. Among them, the silicon wafer 201 can also be replaced with a plastic sheet with a lower price. That is, the first conductive sheet 20 includes: a plastic sheet and a second conductive structure arranged on the back of the plastic sheet. The second conductive structure can be similar to Figure 18 and Figure 19 the first conductive structure shown.

[0111] Among them, the first conductive structure can be integrally formed from one material, or can be combined by multiple materials. For example, Figure 19 the electrode lead-out structure connection area and the battery cell front electrode connection area included in the first conductive structure shown can be integrally formed and adhered to the back of the first conductive sheet by a metallized conductive material or a bus bar, etc. And for another example, Figure 18The first conductive structure shown includes a connection area for the electrode lead-out structure and a front electrode connection area of the cell, which are made of two materials. Among them, the front electrode connection area of the cell is made of a metallized conductive material, and the connection area for the electrode lead-out structure is obtained by pasting a bus bar or a welding tape, etc. on the back of the first conductive sheet. Figure 18 The connection area for the electrode lead-out structure shown can be set during the process of electrically connecting the electrode lead-out structure to the back of the first conductive sheet to facilitate electrical connection with the electrode lead-out structure.

[0112] In the embodiment of the present invention, as Figure 20 and Figure 21 respectively shown in the front view and the back structure of the second conductive sheet 40, the second conductive sheet 40 includes: a silicon wafer 201, a third conductive structure 401 provided on the front of the silicon wafer 201, and a fourth conductive structure 402 provided on the back of the silicon wafer 201. Among them, the third conductive structure 401 and the fourth conductive structure 402 are connected. Among them, the silicon wafer 201 can be replaced by a plastic sheet. That is, the back structure of the second conductive sheet 40, the second conductive sheet 40 includes: a plastic sheet, a fifth conductive structure provided on the front of the plastic sheet, and a sixth conductive structure provided on the back of the plastic sheet. Among them, the fifth conductive structure and the sixth conductive structure are connected. Among them, the fifth conductive structure can be similar to the third conductive structure, and the sixth conductive structure can be similar to the fourth conductive structure.

[0113] Through the above-mentioned second conductive sheet, electrode lead-out structures such as bus bars and welding tapes can cover the back of the second conductive sheet without covering the back electrode and the back light-absorbing area of the battery string. For a double-glass photovoltaic module, the second conductive sheet can effectively improve the photoelectric conversion performance of the double-glass photovoltaic module.

[0114] In the embodiment of the present invention, the length of the first conductive sheet 20 is equal to the length of the cell 101, and the width of the first conductive sheet 20 is not greater than the width of the cell 101.

[0115] In the embodiment of the present invention, the length of the second conductive sheet 40 is equal to the length of the cell 101, and the width of the second conductive sheet 40 is not greater than the width of the cell 101.

[0116] Through the above limitations on the lengths and widths of the first conductive sheet and / or the second conductive sheet, while maintaining the aesthetics of the photovoltaic module, the area occupied by the non-photoelectric conversion regions (the first conductive sheet and the second conductive sheet) in the photovoltaic module can be reduced as much as possible.

[0117] For a single-glass photovoltaic module, if the battery string is a shingled battery string, a first conductive sheet may be provided only on the shingled battery string. For a double-glass photovoltaic module, if the battery string is a shingled battery string, a first conductive sheet and a second conductive sheet may be separately provided at both ends of the shingled battery string. By separately providing the first conductive sheet and the second conductive sheet at both ends, it is possible to avoid the electrode lead-out structure from covering the solar cells included in the battery string, so as to ensure the optoelectronic performance of the photovoltaic module.

[0118] As Figure 22 shown, the photovoltaic module provided by the embodiment of the present invention may further include: a cover plate 50 and an encapsulation adhesive film 60, wherein,

[0119] The encapsulation adhesive film 60 is used to encapsulate a plurality of series-connected or parallel-connected battery strings 10, a plurality of first conductive sheets 20, and multiple electrode lead-out structures 30 between the cover plate 50 and the back plate 70. It can be understood that when both the cover plate 50 and the back plate 70 are made of glass, the photovoltaic module is a double-glass photovoltaic module.

[0120] It should be noted that adjacent solar cells 101 included in the battery string 10 in each of the above embodiments are electrically connected through a conductive medium. The back surface of the first conductive sheet 20 is electrically connected to the front electrode of a solar cell 101' at one end of a battery string 10 through a conductive medium. The conductive medium may be conductive glue, conductive tape, etc.

[0121] As Figure 23 shown, the embodiment of the present invention provides a preparation method using the photovoltaic module provided by the above embodiment, which may include the following steps:

[0122] Step S2301: A step of preparing a battery string;

[0123] This step S2301 can be realized by existing technologies. For example, for a shingled battery string, the back electrode of one solar cell is superimposed on the front electrode of another solar cell, and by applying conductive glue or providing a conductive tape in the overlapping area of the two solar cells, etc., while fixing the two solar cells, a series connection is established between the back electrode of one solar cell and the front electrode of another solar cell.

[0124] Step S2302: Electrically connect the back surface of the first conductive sheet to the front electrode of the first solar cell at the first end of a battery string, wherein the back surface of the first conductive sheet has conductivity, and the appearance of the front surface of the first conductive sheet is the same as the appearance of the front surface of the back plate included in the photovoltaic module;

[0125] The implementation process of this step S2302 is the same as the process of overlapping shingled solar cells in the above step S2301, which further shows that the solution provided by the embodiment of the present invention is simple and easy to implement, and is conducive to industrial production.

[0126] Step S2303: Electrically connect the back surfaces of multiple first conductive sheets and the back surfaces of the second solar cells at the second ends of multiple solar cell strings through a multi-segment electrode lead-out structure.

[0127] Through the above steps, the series connection and / or parallel connection of multiple overlapping tile solar cell strings can be achieved.

[0128] In addition, the specific implementation manner of step S2303 can be: in a group of solar cell strings, for each end of two adjacent solar cell strings, electrically connect the back surface of the first conductive sheet of one solar cell string and the back surface of the second solar cell (or the second conductive sheet electrically connected to the second solar cell) of the other solar cell string through at least one segment of electrode lead-out structure to achieve the series connection of adjacent solar cell strings; the specific implementation manner of step S2303 can also be: in a group of solar cell strings, for one end of two adjacent solar cell strings, electrically connect the back surface of the first conductive sheet of one solar cell string and the back surface of the first conductive sheet of the other solar cell string through at least one segment of electrode lead-out structure, and electrically connect the back surface of the second solar cell (or the second conductive sheet electrically connected to the second solar cell) of one solar cell string and the back surface of the second solar cell (or the second conductive sheet electrically connected to the second solar cell) of the other solar cell string through at least one segment of electrode lead-out structure to achieve the parallel connection of adjacent solar cell strings.

[0129] Several specific embodiments are given below to further illustrate the photovoltaic module obtained by the above preparation method.

[0130] Embodiment 1:

[0131] As Figure 24 shown, the front view of the overlapping tile solar cell string 10 of this embodiment made of solar cells 101 and a first conductive sheet 20 and Figure 25 shown, the cross-sectional view of the overlapping tile solar cell string 10 of this embodiment made of solar cells 101 and a first conductive sheet 20. The first conductive sheet 20 can be produced simultaneously during the production process of conventional solar cells, but according to requirements, the front surface of the first conductive sheet 20 can be a non-metallized coating sheet, so the front surface of the first conductive sheet 20 has the same appearance color as that of a conventional solar cell. The shape of the first conductive sheet 20 is similar to that of the solar cell 101, specifically referring to that the length of the first conductive sheet 20 is the same as the length of the solar cell 101, the width of the first conductive sheet 20 is smaller than the width of the solar cell 101, and the front surface of the first conductive sheet 20 has the same pattern as the front surface of the solar cell 101. A conductive structure is provided in the overlapping area between the back surface of the first conductive sheet 20 and the connected solar cell 101, and this conductive structure extends out of the overlapping area to the other end in the width direction of the first conductive sheet. The electrode lead-out structures at the head and tail of the solar cell string are completely hidden on the back surface of the solar cell string, and the front appearance of the solar cell string is consistent.

[0132] Figure 26 is with Figure 24 The schematic diagram of the back side of the corresponding battery string shows that the electrode lead-out structures 30 at both ends of the battery string are arranged on the back side. The electrode lead-out structure 30 is arranged at the back side electrode of the battery cell at one end of the battery string, and a conductive medium such as conductive glue is used to form a conductive contact; in addition, the electrode lead-out structure 30 is arranged at the other end of the back side width direction of the first conductive sheet 20, and a conductive medium or soldering is used to form a conductive contact with the electrode lead-out structure of other battery strings. For example, the electrode lead-out structure 30 is formed by a solder strip, and the shape of the electrode lead-out structure 30 is a solder strip of 158mm*20mm*0.12mm (length*width*thickness), and then several rectangular holes are punched out on it to form a hollow shape.

[0133] In addition, if Figure 25 The schematic cross-sectional view of the stack of battery strings shown in the figure includes a plurality of battery cells 101 and a first conductive sheet 20. A front electrode is arranged on one side of the front long side of the battery cell 101, and a back electrode is arranged on the other side of the back long side. The front electrode and the back electrode are located at the edges of both sides respectively. The front side of the first conductive sheet 20 is arranged with a pattern similar to the front side of the battery cell 101, and the back side is arranged with a conductive structure extending to both sides of the long side. The plurality of battery cells 101 are arranged as shown in FIG. Figure 25 The first conductive sheet 20 overlaps with the edge of the adjacent battery cell, and the overlapping part is also provided with conductive glue to form a conductive connection. This design disguises the front lead-out electrode at one end of the battery string and moves it to the back of the battery string. Then the electrode lead-out structure 30 is conductively connected with the electrode lead-out structure of other battery strings by welding, conductive glue, etc., and the battery string group is completed. At least one such battery string group is made into a component through layout, laying of adhesive film, glass, backplane, pressing and other processes.

[0134] Embodiment 2:

[0135] The difference between this embodiment and Embodiment 1 lies in the different design of the first conductive sheet.

[0136] In this embodiment, if Figure 19 The electrode lead-out structure on the back side of the first conductive sheet 20 is shown, and the width of the first conductive sheet 20 is also smaller than the width of the battery sheet 101. There is no pattern on the front side of the first conductive sheet 20, only a black coating. In the solution provided in this embodiment, during the process of connecting adjacent battery strings in series or in parallel, the electrode lead-out structures of two battery strings can be directly connected electrically by welding or by connecting the electrode lead-out structures of two battery strings by conductive glue, etc., to achieve electrical connection between the battery strings, and after forming a battery string array, it is stacked, laminated, etc. to form a component.

[0137] Example 3:

[0138] The difference between this embodiment and Embodiment 1 and Embodiment 2 is that a first conductive sheet and a second conductive sheet are respectively arranged at both ends of the battery string.

[0139] In this embodiment, in this embodiment, the electrode lead-out structure on the back of the first conductive sheet 20 as shown in Figure 19 is still selected, and the structure of the second conductive sheet as shown in Figure 20 and Figure 21 . The widths of the first conductive sheet and the second conductive sheet are also smaller than the width of the battery cell 101. The front surfaces of the first conductive sheet and the second conductive sheet 40 are provided with the same patterns as the front surface of the battery cell 101 and are provided with a black coating. In the solution provided by this embodiment, during the series or parallel connection of adjacent battery strings, the electrode lead-out structures of the two battery strings can be directly electrically connected by welding or by connecting the electrode lead-out structures of the two battery strings with conductive glue, etc., to realize the electrical connection between the battery strings. After forming a battery string array and undergoing lamination, pressing, etc. to make a component, the Figure 7 or Figure 8 shown photovoltaic module can be obtained.

[0140] Example 4:

[0141] Five strings of battery strings with a first conductive sheet (the back of the first conductive sheet is electrically connected to the front electrode at one end of the battery string) are connected in parallel to obtain a first battery string group A, and five other strings of battery strings with a first conductive sheet are connected in parallel to obtain a second battery string group B; the electrode lead-out structure included in the back of one end A' with the first conductive sheet in the first battery string group A and the electrode lead-out structure included in the back of one end B" with the battery cell in the second battery string group B are electrically connected by welding or connecting with conductive glue, etc.; the electrode lead-out structure included in the back of one end A" with the battery cell in the first battery string group A and the electrode lead-out structure included in the back of one end B' with the first conductive sheet in the second battery string group B are electrically connected by welding or connecting with conductive glue, etc., to form the Figure 27 shown battery string connection relationship, and then a photovoltaic module is made through lamination, pressing, etc. Among them, Figure 27 shows a schematic structural diagram of the battery string connection relationship formed by this embodiment, and its corresponding partial connection circuit is as shown in Figure 28 .

[0142] Example 5:

[0143] Five strings of battery strings each having a first conductive sheet and a second conductive sheet (the back surface of the first conductive sheet is electrically connected to the front electrode at one end of the battery string, and the front surface of the second conductive sheet is electrically connected to the back electrode at the other end of the battery string) are connected in parallel to obtain a third battery string group C, and another five strings of battery strings each having a first conductive sheet and a second conductive sheet are connected in parallel to obtain a fourth battery string group D; the electrode lead-out structure included in the back surface of one end C' having the first conductive sheet in the third battery string group C and the electrode lead-out structure included in the back surface of one end D" having the second conductive sheet in the fourth battery string group D are electrically connected by means such as welding or conductive glue connection; the electrode lead-out structure included in the back surface of one end C" having the second conductive sheet in the third battery string group C and the electrode lead-out structure included in the back surface of one end D' having the first conductive sheet in the fourth battery string group D are respectively led out as photovoltaic module electrodes, forming Figure 29 the battery string connection relationship shown, and then made into a photovoltaic module through lamination, lamination, etc. The cover plate and the back plate of this photovoltaic module are both glass, that is, a double-glass module with the battery string connection relationship can be obtained in this embodiment. Among them, Figure 29 shows a schematic structural diagram of the battery string connection relationship formed in this embodiment, and its corresponding partial connection circuit is also as Figure 28 shown.

[0144] Embodiment 6:

[0145] Five strings of the first battery strings each having a first conductive sheet (the back surface of the first conductive sheet is electrically connected to the front electrode at one end of the battery string) are connected in parallel to obtain a fifth battery string group E, and five strings of the second battery strings each having a first conductive sheet are connected in parallel to obtain a sixth battery string group F; five strings of the third battery strings each having a first conductive sheet are connected in parallel to obtain a seventh battery string group G; five strings of the fourth battery strings each having a first conductive sheet are connected in parallel to obtain an eighth battery string group H.

[0146] The front surface of the metal foil of one end E' having the first conductive sheet (the first conductive sheet of each battery string in the fifth battery string group E is a metal foil) in the fifth battery string group E is electrically connected to the back electrode of the battery cell of one end F" having the battery cell in the sixth battery string group F by means such as welding or conductive glue connection, so as to realize the series connection of the fifth battery string group E and the sixth battery string group F.

[0147] The electrode lead-out structure included in the back surface of the first conductive sheet of one end F' having the first conductive sheet in the sixth battery string group F and the back electrode of the battery cell of one end G" having the battery cell in the seventh battery string group G are electrically connected by means such as welding; realizing the series connection of the fifth battery string group E, the sixth battery string group F, and the seventh battery string group G.

[0148] One end G' of the first conductive sheet (the first conductive sheet of each battery string in the seventh battery string group G is a metal foil) of the seventh battery string group G is electrically connected to the back electrode of the battery sheet at one end H" of the eighth battery string group H having battery sheets through welding or conductive glue connection, etc. The back electrodes of the battery sheets at one end E" of the fifth battery string group E having battery sheets and the back electrode lead-out structures of the first conductive pads at one end H' of the eighth battery string group H having the first conductive sheet are respectively led out to the photovoltaic module electrode lead-out ends (photovoltaic module negative electrode lead-out end, photovoltaic module positive electrode lead-out end), so as to realize the series connection of the fifth battery string group E, the sixth battery string group F, the seventh battery string group G and the eighth battery string group H, forming Figure 30 the battery string connection relationship shown, and then made into a photovoltaic module through lamination, pressing, etc. Among them, Figure 30 FIG. shows a schematic structural diagram of the battery string connection relationship formed in this embodiment, and its corresponding partial connection circuit is as Figure 31 shown.

[0149] Embodiment 7:

[0150] The first five battery strings having the first conductive sheet (the back of the first conductive sheet is electrically connected to the front electrode at one end of the battery string) are connected in parallel to obtain the ninth battery string group I, and the second five battery strings having the first conductive sheet are connected in parallel to obtain the tenth battery string group J; the third five battery strings having the first conductive sheet are connected in parallel to obtain the eleventh battery string group K; the fourth five battery strings having the first conductive sheet are connected in parallel to obtain the twelfth battery string group L.

[0151] One end I' of the first conductive sheet (the first conductive sheet of each battery string in the ninth battery string group I is a metal foil) of the ninth battery string group I is electrically connected to the back electrode of the battery sheet at one end J" of the tenth battery string group J having battery sheets through welding or conductive glue connection, etc., so as to realize the series connection of the ninth battery string group I and the tenth battery string group J.

[0152] The electrode lead-out structure included in the back of the first conductive sheet at one end J' of the tenth battery string group J and the back electrode lead-out structure of the second conductive sheet at one end K" of the eleventh battery string group K having the second conductive sheet are electrically connected through welding, etc.; realizing the series connection of the ninth battery string group I, the tenth battery string group J and the eleventh battery string group K.

[0153] One end K' of the eleventh cell string group K has a metal foil on the front side of the first conductive sheet (the first conductive sheet of each cell string in the eleventh cell string group K is a metal foil), and the front side of the metal foil is electrically connected to the back electrode of the cell sheet at one end L" of the twelfth cell string group L having cell sheets by means of welding or conductive glue connection, etc. The back electrode lead-out structure of the second conductive sheet at one end I" of the ninth cell string group I having a second conductive sheet and the back electrode lead-out structure of the first conductive sheet at one end H' of the twelfth cell string group H having a first conductive sheet are respectively led out to the electrode lead-out ends of the photovoltaic module (the negative electrode lead-out end and the positive electrode lead-out end of the photovoltaic module), so as to realize the series connection of the ninth cell string group I, the tenth cell string group J, the eleventh cell string group K and the twelfth cell string group L, forming Figure 32 the cell string connection relationship shown, and then through lamination, pressing, etc. to make a photovoltaic module. Among them, Figure 32 FIG. shows a schematic structural diagram of the cell string connection relationship formed by this embodiment, and its corresponding partial connection circuit is also as Figure 31 shown.

[0154] The present application provides the following technical solutions:

[0155] Technical solution 1. A photovoltaic module, comprising:

[0156] a backplane;

[0157] a plurality of cell strings arranged side by side on the backplane, each cell string comprising a plurality of cell sheets electrically connected to each other, wherein the cell sheets at the first end and the second end of the cell string are the first cell sheet and the second cell sheet respectively;

[0158] a first conductive sheet disposed on the front side of the first cell sheet of each cell string; and,

[0159] multiple electrode lead-out structures;

[0160] Wherein,

[0161] the back side of the first conductive sheet has conductivity, and the front appearance of the first conductive sheet is the same as the front appearance of the cell sheet or the front appearance of the backplane, and the back side of the first conductive sheet is electrically connected to the front electrode of the first cell sheet;

[0162] the back sides of the multiple first conductive sheets and the multiple second cell sheets are electrically connected through the multiple electrode lead-out structures.

[0163] Technical solution 2. The photovoltaic module according to Technical solution 1, among adjacent two of the

[0164] The first conductive sheet of one of the battery strings is correspondingly arranged with the second cell of the other battery string;

[0165] The back of the first conductive sheet of one of the battery strings and the back of the second cell of the other battery string are electrically connected through the electrode lead-out structure, so as to realize the series connection of two adjacent battery strings.

[0166] Technical solution 3. The photovoltaic module according to technical solution 1, in two adjacent overlapping tile-type battery strings, the first conductive sheet of one of the battery strings is correspondingly arranged with the first conductive sheet of the other battery string;

[0167] The back of the first conductive sheet of one of the battery strings and the back of the first conductive sheet of the other battery string are electrically connected through at least one section of the electrode lead-out structure;

[0168] The back of the second cell of one of the battery strings and the back of the second cell of the other battery string are electrically connected through at least one section of the electrode lead-out structure, so as to realize the parallel connection of two adjacent battery strings (10).

[0169] Technical solution 4. The photovoltaic module according to technical solution 1, each section of the electrode lead-out structure is electrically connected to the back of one of the second cells;

[0170] Every two adjacent sections of the electrode lead-out structure are electrically connected.

[0171] Technical solution 5. The photovoltaic module according to technical solution 1, further comprising: a second conductive sheet arranged on the back of the second cell, wherein,

[0172] The conductivity of the second conductive sheet extends from the front to the back;

[0173] The front appearance of the second conductive sheet is the same as the front appearance of the cell or the front appearance of the backplane;

[0174] The front of the second conductive sheet is electrically connected to the back electrode of the second cell of the battery string where it is located, so that the second cell is electrically connected to the electrode lead-out structure through the second conductive sheet. A back electrode is arranged on the back of the cell at the other end of the overlapping tile-type battery string.

[0175] Technical solution 6. The photovoltaic module according to technical solution 5, in two adjacent battery strings,

[0176] The first conductive sheet of one of the battery strings is correspondingly arranged with the second conductive sheet of the other battery string;

[0177] The back surface of the first conductive sheet of one of the battery strings and the back surface of the second conductive sheet of the other battery string are electrically connected through the electrode lead-out structure, so as to realize the series connection of two adjacent battery strings.

[0178] Technical solution 7. For the photovoltaic module according to technical solution 5, among two adjacent battery strings,

[0179] the first conductive sheet of one of the battery strings is correspondingly arranged with the first conductive sheet of the other battery string;

[0180] the second conductive sheet of one of the battery strings is correspondingly arranged with the second conductive sheet of the other battery string;

[0181] the back surface of the first conductive sheet of one of the battery strings and the back surface of the first conductive sheet of the other battery string are electrically connected through the electrode lead-out structure;

[0182] the back surface of the second conductive sheet of one of the battery strings and the back surface of the second conductive sheet of the other battery string are electrically connected through the electrode lead-out structure, so as to realize the parallel connection of two adjacent battery strings.

[0183] Technical solution 8. For the photovoltaic module according to technical solution 1,

[0184] the first conductive sheet is prepared from a conductive material;

[0185] Or,

[0186] the first conductive sheet includes: a silicon wafer and a first conductive structure arranged on the back surface of the silicon wafer;

[0187] Or,

[0188] the first conductive sheet includes: a plastic sheet and a second conductive structure arranged on the back surface of the plastic sheet.

[0189] Technical solution 9. For the photovoltaic module according to technical solution 5,

[0190] the second conductive sheet is prepared from a conductive material;

[0191] Or,

[0192] the second conductive sheet includes: a silicon wafer, a third conductive structure arranged on the front surface of the silicon wafer, and a fourth conductive structure arranged on the back surface of the silicon wafer, wherein the third conductive structure and the fourth conductive structure are connected;

[0193] Or,

[0194] The second conductive sheet includes: a plastic sheet, a fifth conductive structure disposed on the front surface of the plastic sheet, and a sixth conductive structure disposed on the back surface of the plastic sheet, wherein the fifth conductive structure and the sixth conductive structure are connected.

[0195] Technical solution 10. The photovoltaic module according to any one of technical solutions 1 to 9, wherein the length of the first conductive sheet is equal to the length of the battery cell, and the width of the first conductive sheet is not greater than the width of the battery cell.

[0196] Technical solution 11. The photovoltaic module according to any one of technical solutions 5 to 7 and 9, wherein the length of the second conductive sheet is equal to the length of the battery cell, and the width of the second conductive sheet is not greater than the width of the battery cell.

[0197] Technical solution 12. The photovoltaic module according to any one of technical solutions 1 to 7, wherein the electrode lead-out structure includes: a solder ribbon and / or a bus bar.

[0198] Technical solution 13. The photovoltaic module according to technical solution 1, wherein a coating having the same color as the front surface of the battery cell is provided on the front surface of the first conductive sheet.

[0199] Technical solution 14. The photovoltaic module according to technical solution 1, wherein adjacent battery cells included in the overlapping tile type battery string are electrically connected through a conductive medium.

[0200] Technical solution 15. The photovoltaic module according to technical solution 1, wherein the back surface of the first conductive sheet and the front electrode of the first battery cell in the battery string where the first conductive sheet is located are electrically connected through a conductive medium.

[0201] Technical solution 16. The photovoltaic module according to technical solution 5, wherein the front surface of the second conductive sheet and the back electrode of the second battery cell in the battery string where the second conductive sheet is located are electrically connected through a conductive medium.

[0202] Technical solution 17. The photovoltaic module according to any one of technical solutions 1 to 9, 13 to 16, further includes: a cover plate and an encapsulation adhesive film, wherein

[0203] The encapsulation adhesive film is used to encapsulate a plurality of the overlapping tile type battery strings connected in series or in parallel, a plurality of first conductive sheets, and a plurality of electrode lead-out structures between the cover plate and the back plate.

[0204] Technical solution 18. The photovoltaic module according to any one of technical solutions 1 to 9, 13 to 16, wherein the battery string is an overlapping tile type battery string.

[0205] Technical solution 19. A method for manufacturing a photovoltaic module provided by any one of the above technical solutions, including:

[0206] Steps for preparing a battery string;

[0207] Electrically connect the back surface of the first conductive sheet to the front electrode of the first cell of the first end of one of the battery strings. Wherein, the back surface of the first conductive sheet has conductivity, and the front appearance of the first conductive sheet is the same as the front appearance of the cells included in the battery string or the front appearance of the backplane included in the photovoltaic module;

[0208] Electrically connect the back surfaces of a plurality of the first conductive sheets and the back surfaces of the second cells at the second ends of the plurality of battery strings through a multi-segment electrode lead-out structure.

[0209] The introduction provided in the above steps is only used to help understand the structure, method and core idea of the present invention. For those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A photovoltaic module, characterized in that, it comprises: a backsheet (70); a plurality of cell strings (10) arranged side by side on the backsheet (70), each cell string (10) comprising a plurality of electrically connected cells, wherein the cells at the first end and the second end of the cell string (10) are a first cell (101′) and a second cell (101″′) respectively; a first conductive sheet (20) disposed on the front surface of the first cell (101′) of each cell string (10); and, a plurality of electrode lead-out structures (30); wherein, the back surface of the first conductive sheet (20) is conductive, and the front appearance of the first conductive sheet (20) is the same as the front appearance of the cell or the front appearance of the backsheet (70), and the back surface of the first conductive sheet (20) is electrically connected to the front electrode of the first cell (101′); the back surfaces of the plurality of first conductive sheets (20) and the plurality of second cells (101″′) are electrically connected through the plurality of electrode lead-out structures (30); the first conductive sheet (20) is formed by processing a cell, and a "mouth" - shaped or "H" - shaped conductive structure is provided on the back surface of the first conductive sheet (20), and the "mouth" - shaped or "H" - shaped conductive structure includes two main grids that are connected and communicate with each other, the two main grids have the same polarity and the materials of the two main grids are the same as the main grid material of the cell, wherein the power generation function of the first conductive sheet (20) is discarded; the electrode lead - out structure (30) electrically connected to the back surface of the first conductive sheet (20) is disposed on the back surface of the first conductive sheet (20).

2. The photovoltaic module according to claim 1, characterized in that, in two adjacent cell strings (10), the first conductive sheet (20) of one cell string (10) is correspondingly arranged with the second cell (101″′) of the other cell string (10); the back surface of the first conductive sheet (20) of one cell string (10) and the back surface of the second cell (101″′) of the other cell string (10) are electrically connected through the electrode lead - out structure (30) to realize the series connection of two adjacent cell strings (10).

3. The photovoltaic module according to claim 1, characterized in that, in two adjacent cell strings (10), the first conductive sheet (20) of one cell string (10) is correspondingly arranged with the first conductive sheet (20) of the other cell string (10); the back surface of the first conductive sheet (20) of one cell string (10) and the back surface of the first conductive sheet (20) of the other cell string (10) are electrically connected through at least one section of the electrode lead - out structure (30); the back surface of the second cell (101″′) of one cell string (10) and the back surface of the second cell (101″′) of the other cell string (10) are electrically connected through at least one section of the electrode lead - out structure (30) to realize the parallel connection of two adjacent cell strings (10).

4. The photovoltaic module according to claim 1, characterized in that, Each of the electrode lead-out structures (30) is electrically connected to the back surface of one of the first conductive sheets (20) or the back surface of one of the second solar cells (101″′). Every two adjacent electrode lead-out structures (30) are electrically connected to each other.

5. The photovoltaic module according to claim 1, characterized in that, it further comprises: a second conductive sheet (40) disposed on the back surface of the second solar cell, wherein, the conductivity of the second conductive sheet (40) extends from the front surface to the back surface of the second conductive sheet (40); the front appearance of the second conductive sheet (40) is the same as the front appearance of the solar cell (101) or the front appearance of the backsheet (70); the front surface of the second conductive sheet (40) is electrically connected to the back electrode of the second solar cell (101″′) of the battery string (10) where it is located, so that the second solar cell (101″′) is electrically connected to the electrode lead-out structure (30) through the second conductive sheet (40).

6. The photovoltaic module according to claim 5, characterized in that, in two adjacent battery strings (10), the first conductive sheet (20) of one battery string (10) and the second conductive sheet (40) of the other battery string (10) are arranged corresponding to each other; the back surface of the first conductive sheet (20) of one battery string (10) and the back surface of the second conductive sheet of the other battery string (10) are electrically connected through the electrode lead-out structure (30) to realize the series connection of two adjacent battery strings (10).

7. The photovoltaic module according to claim 5, characterized in that, in two adjacent battery strings (10), the first conductive sheet (20) of one battery string (10) and the first conductive sheet (20) of the other battery string (10) are arranged corresponding to each other; the second conductive sheet (40) of one battery string (10) and the second conductive sheet (40) of the other battery string (10) are arranged corresponding to each other; the back surface of the first conductive sheet (20) of one battery string (10) and the back surface of the first conductive sheet (20) of the other battery string (10) are electrically connected through the electrode lead-out structure (30); the back surface of the second conductive sheet (40) of one battery string (10) and the back surface of the second conductive sheet (40) of the other battery string (10) are electrically connected through the electrode lead-out structure (30) to realize the parallel connection of two adjacent battery strings (10).

8. The photovoltaic module according to claim 5, characterized in that, the second conductive sheet (40) is a conductive sheet prepared from a conductive material; or, the second conductive sheet (40) comprises: a silicon wafer (201), a third conductive structure (401) disposed on the front surface of the silicon wafer (201), and a fourth conductive structure (402) disposed on the back surface of the silicon wafer (201), wherein the third conductive structure (401) and the fourth conductive structure (402) are connected; or, The second conductive sheet (40) includes: a plastic sheet, a fifth conductive structure disposed on the front surface of the plastic sheet, and a sixth conductive structure disposed on the back surface of the plastic sheet, wherein the fifth conductive structure and the sixth conductive structure are in communication.

9. The photovoltaic module according to any one of claims 1 to 8, wherein, the length of the first conductive sheet (20) is equal to the length of the cell (101), and the width of the first conductive sheet (20) is not greater than the width of the cell (101).

10. The photovoltaic module according to any one of claims 5 to 7 and 8, wherein, the length of the second conductive sheet (40) is equal to the length of the cell (101), and the width of the second conductive sheet (40) is not greater than the width of the cell (101).

11. The photovoltaic module according to any one of claims 1 to 7, wherein, the electrode lead-out structure (30) includes: any one or a combination of a solder strip, a bus bar, and a conductive structure made of the main grid material of the cell.

12. The photovoltaic module according to claim 1, wherein, a coating having the same color as the front surface of the cell (101) is provided on the front surface of the first conductive sheet (20); or, a coating having the same color as the front surface of the backsheet (70) included in the photovoltaic module is provided on the front surface of the first conductive sheet (20).

13. The photovoltaic module according to claim 1, wherein, adjacent cells (101) included in the cell string (10) are electrically connected through a conductive medium.

14. The photovoltaic module according to claim 1, wherein, the back surface of the first conductive sheet (20) is electrically connected to the front electrode of the first cell (101') of the cell string (10) where it is located through a conductive medium.

15. The photovoltaic module according to claim 5, wherein, the front surface of the second conductive sheet (40) is electrically connected to the back electrode of the second cell (101″′) of the cell string (10) where it is located through a conductive medium.

16. The photovoltaic module according to any one of claims 1 to 8, 12 to 15, wherein, further comprising: a cover plate (50) and an encapsulation film (60), wherein, the encapsulation film (60) is used to encapsulate a plurality of the cell strings (10), a plurality of the first conductive sheets (20), and a plurality of electrode lead-out structures (30) connected in series or in parallel between the cover plate (50) and the backsheet (70).

17. The photovoltaic module according to any one of claims 1 to 8, 12 to 15, wherein, the cell string (10) is a shingled cell string.

18. A method for manufacturing a photovoltaic module according to any one of claims 1 to 17, wherein, comprising: a step of manufacturing a cell string (10); Electrically connect the back surface of the first conductive sheet (20) to the front electrode of the first cell (101') at the first end of one of the cell strings (10). Herein, the back surface of the first conductive sheet (20) has conductivity, and the front appearance of the first conductive sheet (20) is consistent with the front appearance of the cells (101) included in the cell string (10) or the front appearance of the backsheet (70) included in the photovoltaic module. Electrically connect the back surfaces of multiple first conductive sheets (20) and the back surfaces of second cells (101″′) at the second ends of multiple cell strings (10) through a multi-segment electrode lead-out structure (30).

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