Back contact photovoltaic module, production device and manufacturing method of back contact photovoltaic module

Abstract

The invention relates to a back contact photovoltaic module, a production device and a manufacturing method of the back contact photovoltaic module. A back contact photovoltaic module includes a first back contact cell, a second back contact cell and a solder strip. In the first direction, the first back contact battery comprises a first front surface and a first back surface which are arranged oppositely; in the first direction, the second back contact battery comprises a second front face and a second back face which are arranged oppositely, the first back contact battery and the second back contact battery are arranged in a stacked mode in the first direction, and the first back face and the second back face are arranged oppositely in the first direction. The welding strip is arranged between the first back contact cell and the second back contact cell along the first direction, and the welding strip is electrically connected with the first back surface of the first back contact cell and the second back surface of the second back contact cell. Under the condition that the occupied size of the back contact photovoltaic module is roughly kept unchanged, the photoelectric conversion efficiency of the back contact photovoltaic module is relatively high.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a back-contact photovoltaic module, a production device, and a method for manufacturing a back-contact photovoltaic module. Background Art

[0002] Photovoltaic modules are components that convert solar energy into electrical energy and are the most important part of a solar power generation system.

[0003] However, the photovoltaic conversion efficiency of the photovoltaic modules in the related art is low. Summary of the Invention

[0004] Based on this, it is necessary to provide a back-contact photovoltaic module, a production device and a manufacturing method of a back-contact photovoltaic module to address the above technical problems, which can improve the photoelectric conversion efficiency of the back-contact photovoltaic module.

[0005] According to the first aspect of the present application, a back-contact photovoltaic module is provided, comprising a first back-contact cell, a second back-contact cell, and a welding ribbon. Along the first direction, the first back-contact cell comprises a first front surface and a first back surface disposed opposite to each other; along the first direction, the second back-contact cell comprises a second front surface and a second back surface disposed opposite to each other; along the first direction, the first back-contact cell and the second back surface are stacked and disposed opposite to each other; and along the first direction, the first back surface and the second back surface are disposed opposite to each other. A welding ribbon is disposed between the first back-contact cell and the second back-contact cell along the first direction, and the welding ribbon is electrically connected to the first back surface of the first back-contact cell and the second back surface of the second back-contact cell, respectively; wherein the first direction is parallel to the thickness direction of the first back-contact cell and parallel to the thickness direction of the second back-contact cell.

[0006] In one embodiment, the first back contact battery further includes a first electrode and a second electrode with opposite polarities provided on the first back side; the second back contact battery further includes a third electrode and a fourth electrode with opposite polarities provided on the second back side; the third electrode has the same polarity as the first electrode; a plurality of welding strips are provided; the plurality of welding strips include a first welding strip electrically connected to the first electrode, and a second welding strip electrically connected to the second electrode; wherein, the side of the first welding strip facing away from the first electrode is electrically connected to the third electrode of the second back contact battery; the side of the second welding strip facing away from the second electrode is electrically connected to the fourth electrode of the second back contact battery; or, the side of the first welding strip facing away from the first electrode is electrically connected to the fourth electrode of the second back contact battery; or, the side of the second welding strip facing away from the second electrode is electrically connected to the third electrode of the second back contact battery.

[0007] In one embodiment, the back-contact photovoltaic module further includes an electrical isolator; along the first direction, the electrical isolator is arranged between the side of the welding strip close to the second back-contact cell and the second back-contact cell; the electrical isolator is provided with a hollow hole for exposing the welding strip; the second back-contact cell includes a plurality of welding pads arranged on the second back side; at least part of the welding pad is arranged in the adjacent hollow hole to be electrically connected to the adjacent welding strip.

[0008] In one embodiment, the orthographic projection of the first back-contact battery on the target plane is located within the range of the orthographic projection of the electrical isolator on the target plane; and / or, the orthographic projection of the second back-contact battery on the target plane is located within the range of the orthographic projection of the electrical isolator on the target plane; and / or, the electrical isolator includes an adhesive film; the hollow hole is formed on the adhesive film; wherein, the target plane is perpendicular to the first direction.

[0009] In one embodiment, the back-contact photovoltaic module includes a first battery group and a second battery group; the first battery group includes a plurality of the first back-contact batteries arranged along a second direction; the second battery group includes a plurality of the second back-contact batteries arranged along the second direction; along the first direction, the first back-contact batteries are stacked one-to-one with the second back-contact batteries, and along the first direction, the first back side and the corresponding second back side are arranged opposite to each other; at least one stacked first back-contact battery and the second back-contact battery are electrically connected by at least one welding strip; the first direction and the second direction are perpendicular to each other.

[0010] In one embodiment, the plurality of back-contact cells in the first battery group and the second battery group are electrically connected in series, in parallel or in a mixed manner; wherein the back-contact cell is the first back-contact cell or the second back-contact cell; and the mixed manner is a combination of series and parallel.

[0011] In one embodiment, the back-contact photovoltaic module further includes a plurality of third welding ribbons and a plurality of fourth welding ribbons; in the first battery group, two adjacent first back-contact batteries are connected in series through the third welding ribbon; in the second battery group, two adjacent second back-contact batteries are electrically connected in series through the fourth welding ribbon; in the first battery group and the second battery group, the first back-contact battery and the second back-contact battery on one side along the second direction are connected in series with each other through the welding ribbon located between the first back-contact battery and the second back-contact battery.

[0012] In one embodiment, the back-contact photovoltaic module includes a plurality of the welding ribbons; the welding ribbons are arranged corresponding to the first back-contact cells; and the welding ribbons are electrically connected between the corresponding first back-contact cells and the corresponding second back-contact cells.

[0013] In one embodiment, the back-contact photovoltaic module further includes an electrical isolator; along the first direction, the electrical isolator is arranged between the side of the corresponding welding strip close to the adjacent second back-contact battery and the second back-contact battery; the electrical isolator is provided with a plurality of hollow holes, the hollow holes are arranged corresponding to the welding strips, and the hollow holes are used to expose the corresponding welding strips.

[0014] In one embodiment, the first back contact cell and the adjacent second back contact cell are connected in parallel through the corresponding welding strips to form a parallel battery group, and multiple parallel battery groups are connected in series with each other; or, the first back contact cell and the adjacent second back contact cell are connected in parallel through the corresponding welding strips to form a parallel battery group, and multiple parallel battery groups are connected in parallel with each other.

[0015] According to a second aspect of the present application, a production device is provided, including a providing mechanism, a first welding mechanism, and a second welding mechanism.

[0016] The providing mechanism is used to provide a first back-contact cell, a second back-contact cell, and a soldering ribbon. Along a first direction, the first back-contact cell includes a first front side and a first back side disposed opposite each other, and the second back-contact cell includes a second front side and a second back side disposed opposite each other. The first direction is parallel to the thickness direction of the first back-contact cell and the thickness direction of the second back-contact cell. A first welding mechanism is used to weld the soldering ribbon to the first back side of the first back-contact cell. A second welding mechanism is used to weld the soldering ribbon to the second back side of the second back-contact cell.

[0017] In one embodiment, the providing mechanism includes a positioning seat, which is provided with a groove for positioning the welding ribbon, and along the first direction, the side of the welding ribbon facing away from the bottom wall of the groove protrudes from the groove; and or, the first welding mechanism includes a heating mechanism for heating the positioning seat; and or, the production device also includes a flipping mechanism, which is used to flip the first back side of the first back contact battery upward after the welding ribbon is welded to the first back side of the first back contact battery; and or, the second welding mechanism includes an infrared heater for heating the welding ribbon; and or, the production device also includes a suction mechanism, which is used to suck the electrical isolator after the welding ribbon is welded to the first back side of the first back contact battery, so as to arrange the electrical isolator along the first direction between the side of the welding ribbon close to the second back contact battery and the second back contact battery; wherein, the electrical isolator is provided with a hollow hole for exposing the welding ribbon.

[0018] According to a third aspect of the present application, a method for manufacturing a back-contact photovoltaic module is provided, comprising: providing a first back-contact cell, a second back-contact cell and a welding ribbon; along a first direction, the first back-contact cell comprises a first front side and a first back side arranged opposite to each other, and the second back-contact cell comprises a second front side and a second back side arranged opposite to each other; wherein, the first direction is parallel to the thickness direction of the first back-contact cell, and is parallel to the thickness direction of the second back-contact cell; the welding ribbon is welded to the first back side of the first back-contact cell, and the welding ribbon is welded to the second back side of the second back-contact cell.

[0019] In the technical solution of the present application, compared with the arrangement of two back contact cells in the plane where the back contact cells are located, in the present application, the first back contact cell and the second back contact cell are stacked and arranged, and the first back side and the second back side are arranged opposite to each other along the first direction. In this way, the first front side of the first back contact cell is arranged downward, and the second front side of the second back contact cell is arranged upward, so that the first front side of the first back contact cell and the second front side of the second back contact cell can both receive external light. In this way, the occupied size of the back contact photovoltaic module can be reduced while the occupied size of the back contact photovoltaic module remains roughly unchanged. In other words, the photoelectric conversion efficiency of the back contact photovoltaic module of the present application is higher while the occupied size of the back contact photovoltaic module remains roughly unchanged. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of multiple first back-contact cells and multiple second back-contact cells in one embodiment of the present application is shown.

[0021] Figure 2A schematic structural diagram of a first back contact cell and a second back contact cell electrically connected via a welding ribbon according to an embodiment of the present application is shown.

[0022] Figure 3 A schematic structural diagram showing another embodiment of the present application showing a first back contact cell and a second back contact cell electrically connected via a welding ribbon.

[0023] Figure 4 A schematic structural diagram of a first battery pack according to an embodiment of the present application is shown.

[0024] Figure 5 A schematic structural diagram of a second battery pack according to an embodiment of the present application is shown.

[0025] Figure 6 A schematic structural diagram of a back-contact photovoltaic module according to an embodiment of the present application is shown.

[0026] Figure 7 A circuit block diagram of a first battery pack and a second battery pack according to an embodiment of the present application is shown.

[0027] Figure 8 A schematic structural diagram of a back-contact photovoltaic module according to another embodiment of the present application is shown.

[0028] Figure 9 A circuit block diagram of a first battery pack and a second battery pack according to another embodiment of the present application is shown.

[0029] Figure 10 A circuit block diagram of a first battery pack and a second battery pack according to another embodiment of the present application is shown.

[0030] Figure 11 A schematic diagram of the welding process of the first back contact cell and the welding ribbon according to an embodiment of the present application is shown.

[0031] Figure markings: 10, back-contact photovoltaic module; 100, first battery group; 110, first back-contact cell; 111, first front side; 112, first back side; 200, second battery group; 210, second back-contact cell; 211, second front side; 212, second back side; 213, first soldering pad; 214, second soldering pad; 300, soldering strip; 310, first soldering strip; 320, second soldering strip; 400, electrical isolation member; 401, hollow hole; 500, third soldering strip; 600, fourth soldering strip; 20, positioning seat; 21, groove. DETAILED DESCRIPTION

[0032] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0033] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0034] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0035] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0036] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0037] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0038] Figure 1 A schematic structural diagram of a plurality of first back-contact cells (ie, the first cell group described below) and a plurality of second back-contact cells (ie, the second cell group described below) in one embodiment of the present application is shown. Figure 2 A schematic diagram showing a structure in which a first back contact cell and a second back contact cell are electrically connected via a welding ribbon in an embodiment of the present application is shown. Figure 3 A schematic structural diagram showing another embodiment of the present application showing a first back contact cell and a second back contact cell electrically connected via a welding ribbon.

[0039] Please refer to Figure 1-Figure 3 An embodiment of the present application provides a back-contact photovoltaic module 10 , including a first back-contact cell 110 , a second back-contact cell 210 and a welding ribbon 300 .

[0040] Along the first direction F1, the first back contact cell 110 includes a first front side 111 and a first back side 112 disposed opposite to each other, and the second back contact cell 210 includes a second front side 211 and a second back side 212 disposed opposite to each other. Along the first direction F1, the first back contact cell 110 and the second back contact cell 210 are stacked, and along the first direction F1, the first back side 112 and the second back side 212 are disposed opposite to each other.

[0041] Alternatively, along the first direction F1, the first back-contact cell 110 may be positioned below the second back-contact cell 210, with the first back side 112 of the first back-contact cell 110 flipped upward. Alternatively, along the first direction F1, the second back-contact cell 210 may be positioned below the first back-contact cell 110, with the second back side 212 of the second back-contact cell 210 flipped upward. This is not a specific limitation.

[0042] The soldering ribbon 300 is disposed between the first back contact cell 110 and the second back contact cell 210 along the first direction F1 and is electrically connected to the first back side 112 of the first back contact cell 110 and the second back side 212 of the second back contact cell 210 .

[0043] The first direction F1 is parallel to the thickness direction of the first back contact cell 110 and parallel to the thickness direction of the second back contact cell 210 .

[0044] Taking the example of the first back contact cell 110 being located below the second back contact cell 210 along the first direction F1, compared to the arrangement of two back contact cells in the plane where the back contact cells are located, in the present application, the first back contact cell 110 and the second back contact cell 210 are stacked, and along the first direction F1, the first back side 112 and the second back side 212 are arranged opposite to each other, so that the first front side 111 of the first back contact cell 110 is arranged downward, and the second front side 211 of the second back contact cell 210 is arranged upward, so that the first front side 111 of the first back contact cell 110 and the second front side 211 of the second back contact cell 210 can both receive external light. In this way, the occupied size of the back contact photovoltaic component 10 can be reduced while the photoelectric efficiency of the back contact photovoltaic component 10 remains roughly unchanged. In other words, the photoelectric conversion efficiency of the back contact photovoltaic component 10 of the present application is higher while the occupied size of the back contact photovoltaic component 10 remains roughly unchanged.

[0045] The first back-contact cell 110 further includes a first electrode (not shown) and a second electrode (not shown) disposed on the first back surface 112 and having opposite polarities. The second back-contact cell 210 further includes a third electrode (not shown) and a fourth electrode (not shown) disposed on the second back surface 212 and having opposite polarities. The third electrode has the same polarity as the first electrode. It is understood that the fourth electrode has the same polarity as the second electrode.

[0046] A plurality of welding ribbons 300 are provided, and the plurality of welding ribbons 300 include a first welding ribbon 310 electrically connected to the first electrode, and a second welding ribbon 320 electrically connected to the second electrode.

[0047] Alternatively, the side of the first soldering ribbon 310 facing away from the first electrode may be electrically connected to the fourth electrode of the second back contact cell 210 ; or the side of the second soldering ribbon 320 facing away from the second electrode may be electrically connected to the third electrode of the second back contact cell 210 .

[0048] In this way, electrodes with opposite polarities are electrically connected, and the first back contact cell 110 and the second back contact cell 210 can be connected in series.

[0049] Alternatively, the side of the first solder ribbon 310 facing away from the first electrode is electrically connected to the third electrode of the second back-contact cell 210, and the side of the second solder ribbon 320 facing away from the second electrode is electrically connected to the fourth electrode of the second back-contact cell 210. In this way, the first back-contact cell 110 and the second back-contact cell 210 can be connected in parallel.

[0050] In some embodiments, the back-contact photovoltaic module 10 further includes an electrical isolator 400, which is disposed along the first direction F1 between the side of the soldering ribbon 300 proximal to the second back-contact cell 210 and the second back-contact cell 210. The electrical isolator 400 is provided with a hollow hole 401 for exposing the soldering ribbon 300. The second back-contact cell 210 includes a plurality of solder pads disposed on the second back surface 212. At least a portion of the solder pads is disposed within adjacent hollow holes 401 to electrically connect to adjacent soldering ribbons 300.

[0051] Specifically, the plurality of soldering ribbons 300 include a first soldering ribbon 310 electrically connected to the first electrode and a second soldering ribbon 320 electrically connected to the second electrode. The plurality of soldering pads include a first soldering pad 213 corresponding to the third electrode and a second soldering pad 214 corresponding to the fourth electrode.

[0052] It can be that at least a portion of the first solder pad 213 is disposed in the adjacent hollow hole 401 to be electrically connected to the adjacent second solder strip 320. It can also be that Figure 2 As shown, at least a portion of the second solder pad 214 is disposed in the adjacent hollow hole 401 to be electrically connected to the adjacent first solder strip 310. In this way, the first back contact cell 110 and the second back contact cell 210 can be connected in series. Figure 2 In the illustrated embodiment, the thickness of the first pad 213 is relatively small, which is not shown in the figure.

[0053] Alternatively, at least a portion of the first solder pad 213 may be disposed within an adjacent hollow hole 401 to electrically connect to the adjacent first solder ribbon 310, and at least a portion of the second solder pad 214 may be disposed within an adjacent hollow hole 401 to electrically connect to the adjacent second solder ribbon 320. In this manner, a parallel connection between the first back-contact cell 110 and the second back-contact cell 210 may be achieved.

[0054] It should be noted that the pads corresponding to the first back contact cell 110 are thinner than the first pads 213 and the second pads 214 corresponding to the second back contact cell 210 . Therefore, the pads corresponding to the first back contact cell 110 are not shown in the figure.

[0055] In this way, the corresponding welding strip 300 can be used to realize the electrical connection between the stacked first back contact cell 110 and the second back contact cell 210, and the electrical isolation member 400 can be used to improve the reliability of the electrical connection between the first back contact cell 110 and the second back contact cell 210.

[0056] In some embodiments, an orthographic projection of the first back-contact cell 110 on the target plane is within the range of an orthographic projection of the electrical isolator 400 on the target plane, and the target plane is perpendicular to the first direction F1 .

[0057] In this way, the electrical isolation member 400 can completely cover the first back contact cell 110 , thereby improving the reliability of the electrical connection between the first back contact cell 110 and the second back contact cell 210 .

[0058] In some embodiments, an orthographic projection of the second back-contact cell 210 on the target plane is located within the range of an orthographic projection of the electrical isolator 400 on the target plane, and the target plane is perpendicular to the first direction F1 .

[0059] In a direction parallel to the target plane, the peripheral wall of the electrical isolator 400 can be located outside the peripheral wall of the second back contact cell 210 , thereby further improving the reliability of the electrical connection between the first back contact cell 110 and the second back contact cell 210 .

[0060] In some embodiments, the electrical isolator 400 includes an adhesive film; and the hollow hole 401 is formed on the adhesive film.

[0061] The provision of the adhesive film can reduce the risk of hidden cracks during the process of welding the welding ribbon 300 to the first back contact battery 110 and the second back contact battery 210, thereby improving welding reliability.

[0062] In some embodiments, please refer to Figure 1 、 Figure 4 and Figure 5 The back-contact photovoltaic module 10 includes a first battery group 100 and a second battery group 200. The first battery group 100 includes a plurality of first back-contact batteries 110 arranged along the second direction F2, and the second battery group 200 includes a plurality of second back-contact batteries 210 arranged along the second direction F2.

[0063] Along the first direction F1, first back-contact cells 110 are stacked one-to-one with second back-contact cells 210. Also, along the first direction F1, first back surfaces 112 and corresponding second back surfaces 212 are positioned opposite each other. At least one stacked first back-contact cell 110 and second back-contact cell 210 are electrically connected via at least one solder ribbon 300. The first direction F1 and the second direction F2 are perpendicular to each other.

[0064] Alternatively, the stacked first back contact cells 110 and the second back contact cells 210 may be electrically connected via at least one welding ribbon 300. The stacked first back contact cells 110 and the second back contact cells 210 may be connected in series or in parallel.

[0065] Alternatively, a plurality of stacked first back contact cells 110 and second back contact cells 210 may be electrically connected via at least one welding ribbon 300. A plurality of stacked first back contact cells 110 and second back contact cells 210 may be connected in series or in parallel.

[0066] Alternatively, in all stacked first back contact cells 110 and second back contact cells 210 , the first back contact cells 110 and the second back contact cells 210 are electrically connected via at least one welding ribbon 300 .

[0067] In this way, the first battery group 100 and the second battery group 200 include multiple groups of stacked first back contact batteries 110 and second back contact batteries 210, which is more conducive to improving the photoelectric conversion efficiency of the back contact photovoltaic component 10 while keeping the occupied size of the back contact photovoltaic component 10 unchanged.

[0068] In some embodiments, the plurality of back-contact cells in the first battery pack 100 and the second battery pack 200 are electrically connected in series, parallel, or hybrid mode, and the back-contact cells are the first back-contact cells 110 or the second back-contact cells 210. Hybrid mode is a combination of series and parallel mode.

[0069] In this way, the electrical connection mode of the plurality of back-contact cells in the first battery group 100 and the second battery group 200 can be set as needed to meet the power supply requirements of the back-contact photovoltaic module 10 in different scenarios.

[0070] In some embodiments, as Figure 6 and Figure 7As shown, the back-contact photovoltaic module 10 further includes a plurality of third welding ribbons 500 and a plurality of fourth welding ribbons 600. In the first cell group 100, two adjacent first back-contact cells 110 are connected in series via the third welding ribbons 500. In the second cell group 200, two adjacent second back-contact cells 210 are connected in series via the fourth welding ribbons 600. In the first cell group 100 and the second cell group 200, the first back-contact cells 110 and the second back-contact cells 210 on one side along the second direction F2 are connected in series via the welding ribbon 300 located between the first back-contact cells 110 and the second back-contact cells 210.

[0071] It can be understood that, in the first back contact cell 110 and the second back contact cell 210, the side of the first welding strip 310 facing away from the first electrode can be electrically connected to the fourth electrode of the second back contact cell 210; or the side of the second welding strip 320 facing away from the second electrode can be electrically connected to the third electrode of the second back contact cell 210.

[0072] In this way, the first battery group 100 and the second battery group 200 can be connected in series with each other, and in the first battery group 100, two adjacent first back contact batteries 210 are connected in series through the third welding strip 500, and in the second battery group 200, two adjacent second back contact batteries 210 are connected in series through the fourth welding strip 600. In this way, the series connection of all back contact batteries can be achieved, thereby meeting the power supply requirements of the back contact photovoltaic module 10 at a higher voltage.

[0073] In some embodiments, the back-contact photovoltaic module 10 includes a plurality of welding ribbons 300. The welding ribbons 300 are arranged corresponding to the first back-contact cells 110. Typically, one first back-contact cell 110 corresponds to multiple welding ribbons 300. The welding ribbons 300 are electrically connected between the corresponding first back-contact cell 110 and the corresponding second back-contact cell 210.

[0074] It can be that in each stacked first back contact cell 110 and second back contact cell 210, the first back contact cell 110 and the second back contact cell 210 are connected in parallel through the corresponding welding strip 300. In this way, the first back contact cell 110 and the second back contact cell 210 in each stacked layer can be connected in parallel, which can significantly improve the total capacity of the back contact photovoltaic module 10, and thus make the back contact photovoltaic module 10 suitable for application scenarios with high energy requirements and safety considerations.

[0075] In some embodiments, please refer to Figure 8 and Figure 9 The first back contact cell 110 and the adjacent second back contact cell 210 are connected in parallel via corresponding welding strips 300 to form a parallel cell group, and the plurality of parallel cell groups are connected in series.

[0076] Specifically, in the stacked first back contact cell 110 and the second back contact cell 210, the side of the first welding strip 310 facing away from the first electrode is electrically connected to the third electrode of the second back contact cell 210; the side of the second welding strip 320 facing away from the second electrode is electrically connected to the fourth electrode of the second back contact cell 210.

[0077] In this way, the plurality of back-contact cells of the first battery group 100 and the second battery group 200 can be connected in series, thereby making the back-contact photovoltaic module 10 suitable for application scenarios that take both capacity and voltage into consideration.

[0078] In other embodiments, please refer to Figure 8 and Figure 10 The first back contact cell 110 and the adjacent second back contact cell 210 are connected in parallel via corresponding welding strips 300 to form a parallel cell group, and multiple parallel cell groups are connected in parallel with each other.

[0079] Specifically, in the stacked first back contact cell 110 and the second back contact cell 210, the side of the first solder strip 310 facing away from the first electrode is electrically connected to the first solder pad 213 on the second back contact cell 210 (the first solder pad 213 is electrically connected to the corresponding third electrode); the side of the second solder strip 320 facing away from the second electrode is electrically connected to the second solder pad 214 on the second back contact cell 210 (the second solder pad 214 is electrically connected to the corresponding fourth electrode).

[0080] In this way, the stacked first back contact cell 110 and the second back contact cell 210 are connected in parallel to each other, and multiple parallel cell groups are connected in parallel to each other, which can significantly improve the total capacity of the back contact photovoltaic module 10, thereby making the back contact photovoltaic module 10 suitable for application scenarios with high energy requirements and safety considerations.

[0081] In some embodiments, the back-contact photovoltaic module 10 further includes an electrical isolator 400. Along the first direction F1, the electrical isolator 400 is disposed between a side of the corresponding welding ribbon 300 close to the adjacent second back-contact cell 210 and the second back-contact cell 210;

[0082] The electrical isolator 400 is provided with a plurality of hollow holes 401 . The hollow holes 401 are provided corresponding to the soldering strips 300 , and the hollow holes 401 are used to expose the corresponding soldering strips 300 .

[0083] It is possible that the second battery pack 200 includes m second back contact batteries 210, and one second back contact battery 210 corresponds to n welding strips 300. In this way, an electrical isolator 400 can be set, and the number of hollow holes 401 set on an electrical isolator 400 can be the product of m and n.

[0084] In this way, the hollow holes 401 can be used to expose the corresponding soldering ribbons 300 , so as to facilitate the electrical connection of the stacked first back contact cells 110 and the second back contact cells 210 via the soldering ribbons.

[0085] The present application also provides a production device, including a providing mechanism, a first welding mechanism, and a second welding mechanism. The providing mechanism is used to provide a first back-contact cell 110, a second back-contact cell 210, and a welding ribbon 300. The first welding mechanism is used to weld the welding ribbon 300 to the first back side 112 of the first back-contact cell 110, and the second welding mechanism is used to weld the welding ribbon 300 to the second back side 212 of the second back-contact cell 210.

[0086] In this way, the first back contact cell 110 and the second back contact cell 210 can be stacked, and the welding strip 300 can be electrically connected between the first back contact cell 110 and the second back contact cell 210. Therefore, when the occupied size of the back contact photovoltaic component 10 remains roughly unchanged, the photoelectric conversion efficiency of the back contact photovoltaic component 10 manufactured using the production device of the present application is higher.

[0087] In some embodiments, the providing mechanism includes a positioning seat 20 , which is provided with a groove 21 for positioning the welding ribbon 300 . Along the first direction F1 , the side of the welding ribbon 300 facing away from the bottom wall of the groove 21 protrudes from the groove 21 .

[0088] In this way, the positioning base 20 is used to facilitate positioning of the soldering ribbon 300 so as to electrically connect the soldering ribbon 300 to the first back contact cell 110 .

[0089] In some embodiments, the first welding mechanism includes a heating mechanism for heating the positioning seat 20 .

[0090] The heating mechanism may be an electric heating method or an infrared heating method, which is not specifically limited here.

[0091] The heating mechanism of the first welding mechanism can be used to heat the positioning seat 20, and then heat the welding ribbon 300, so as to facilitate the temperature on the welding ribbon 300 to be transferred to the welding pad on the first back contact battery 110, so that the welding pad on the first back contact battery 110 is electrically connected to the corresponding welding ribbon 300.

[0092] The production apparatus further includes a flipping mechanism for flipping the first back side 112 of the first back contact cell 110 upward after the soldering ribbon 300 is soldered to the first back side 112 of the first back contact cell 110 .

[0093] The flipping mechanism may include a rotating cylinder or a motor, and may further include a clamping claw for clamping the first back contact battery 110 .

[0094] After completing the welding of the first back contact cell 110 and the soldering ribbon 300, the first back contact cell 110 can be clamped by a clamp, and then the clamp is driven by a cylinder or a motor to drive the first back contact cell 110 and the soldering ribbon 300 to flip upward, so that the soldering ribbon 300 can be electrically connected to the second back contact cell 210.

[0095] In some embodiments, the second welding mechanism includes an infrared heater for heating the welding ribbon 300 .

[0096] In this way, after the first back contact cell 110 and the soldering ribbon 300 are flipped upward, the soldering ribbon 300 can be remotely infrared heated using an infrared heater, and the second back side 212 of the second back contact cell 210 can be turned toward the soldering ribbon 300 so that the temperature of the soldering ribbon 300 is transferred to the soldering pad of the second back contact cell 210, causing the soldering pad to melt, thereby electrically connecting the soldering ribbon 300 to the soldering pad of the second back contact cell 210.

[0097] In some embodiments, the production device also includes a suction mechanism, which is used to suck the electrical isolator 400 after the welding ribbon 300 is welded to the first back side 112 of the first back contact battery 110, so as to arrange the electrical isolator 400 along the first direction F1 between the side of the welding ribbon 300 close to the second back contact battery 210 and the second back contact battery 210; wherein, the electrical isolator 400 is provided with a hollow hole 401 for exposing the welding ribbon 300.

[0098] In this way, the corresponding welding strip 300 can be used to realize the electrical connection between the stacked first back contact cell 110 and the second back contact cell 210, and the electrical isolation member 400 can be used to improve the reliability of the electrical connection between the first back contact cell 110 and the second back contact cell 210.

[0099] The present application also provides a method for manufacturing a back-contact photovoltaic module 10, comprising:

[0100] S10, providing a first back contact cell, a second back contact cell and a welding ribbon.

[0101] Along the first direction, the first back contact cell includes a first front side and a first back side arranged opposite to each other, and the second back contact cell includes a second front side and a second back side arranged opposite to each other; wherein the first direction is parallel to the thickness direction of the first back contact cell and parallel to the thickness direction of the second back contact cell.

[0102] S20, welding the welding ribbon to the first back side of the first back contact cell, and welding the welding ribbon to the second back side of the second back contact cell.

[0103] In this way, when the occupied size of the back-contact photovoltaic module 10 remains substantially unchanged, the back-contact photovoltaic module 10 manufactured using the manufacturing method of the back-contact photovoltaic module 10 of the present application has a higher photoelectric conversion efficiency.

[0104] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A back contact photovoltaic module, characterized in that: include: a first back-contact cell, wherein the first back-contact cell comprises a first front side and a first back side disposed opposite to each other along a first direction; a second back-contact cell, wherein the second back-contact cell comprises a second front side and a second back side disposed opposite to each other along the first direction, the first back-contact cell and the second back-contact cell are stacked along the first direction, and the first back side and the second back side are disposed opposite to each other along the first direction; and a soldering ribbon, disposed between the first back-contact cell and the second back-contact cell along the first direction, and electrically connected to the first back side of the first back-contact cell and the second back side of the second back-contact cell, respectively; The first direction is parallel to the thickness direction of the first back contact cell and parallel to the thickness direction of the second back contact cell.

2. The back contact photovoltaic module according to claim 1, characterized in that: The first back contact cell further includes a first electrode and a second electrode disposed on the first back surface and having opposite polarities; The second back contact cell further includes a third electrode and a fourth electrode disposed on the second back surface and having opposite polarities; the third electrode has the same polarity as the first electrode; There are multiple welding strips; the multiple welding strips include a first welding strip electrically connected to the first electrode, and a second welding strip electrically connected to the second electrode; wherein the side of the first welding ribbon facing away from the first electrode is electrically connected to the third electrode of the second back contact battery; the side of the second welding ribbon facing away from the second electrode is electrically connected to the fourth electrode of the second back contact battery; or, The side of the first welding ribbon facing away from the first electrode is electrically connected to the fourth electrode of the second back contact cell; or, A side of the second soldering ribbon facing away from the second electrode is electrically connected to the third electrode of the second back contact cell.

3. The back contact photovoltaic module according to claim 1, characterized in that: The back-contact photovoltaic module further includes an electrical isolator; Along the first direction, the electrical isolation member is provided between a side of the welding ribbon close to the second back contact cell and the second back contact cell; The electrical isolator is provided with a hollow hole for exposing the welding strip; The second back contact cell includes a plurality of solder pads provided on the second back surface; At least a portion of the soldering pad is disposed in the adjacent hollow hole to be electrically connected to the adjacent soldering strip.

4. The back contact photovoltaic module according to claim 3, characterized in that: The orthographic projection of the first back contact cell on the target plane is within the range of the orthographic projection of the electrical spacer on the target plane; and / or The orthographic projection of the second back contact cell on the target plane is located within the range of the orthographic projection of the electrical spacer on the target plane; and / or The electrical isolation member includes a film; the hollow hole is formed on the film; Wherein, the target plane is perpendicular to the first direction.

5. The back contact photovoltaic module according to any one of claims 1 to 4, characterized in that: The back-contact photovoltaic module includes a first battery group and a second battery group; The first battery group includes a plurality of the first back-contact batteries arranged along a second direction; The second battery group includes a plurality of second back-contact batteries arranged along the second direction; Along the first direction, the first back-contact cells are stacked one-to-one with the second back-contact cells, and along the first direction, the first back surface and the corresponding second back surface are arranged opposite to each other; At least one stacked first back contact cell and second back contact cell are electrically connected via at least one welding ribbon; The first direction and the second direction are perpendicular to each other.

6. The back contact photovoltaic module according to claim 5, characterized in that: The plurality of back-contact cells in the first battery group and the second battery group are electrically connected in series, parallel or mixed; Wherein, the back contact cell is the first back contact cell or the second back contact cell; The series connection is a combination of series connection and parallel connection.

7. The back contact photovoltaic module according to claim 6, characterized in that: The back contact photovoltaic module further includes a plurality of third welding ribbons and a plurality of fourth welding ribbons; In the first battery pack, two adjacent first back contact batteries are connected in series via the third welding ribbon; In the second battery pack, two adjacent second back contact batteries are electrically connected in series via the fourth welding ribbon; In the first battery group and the second battery group, the first back contact battery and the second back contact battery on one side along the second direction are connected in series via the welding ribbon located between the first back contact battery and the second back contact battery.

8. The back contact photovoltaic module according to claim 6, characterized in that: The back contact photovoltaic module includes a plurality of the welding ribbons; The welding strip is arranged corresponding to the first back contact cell; The welding ribbon is electrically connected between the corresponding first back contact cell and the corresponding second back contact cell.

9. The back contact photovoltaic module according to claim 8, characterized in that: The back-contact photovoltaic module further includes an electrical isolator; Along the first direction, the electrical isolation member is provided between a side of the corresponding welding ribbon close to the adjacent second back contact battery and the second back contact battery; The electrical isolator is provided with a plurality of hollow holes, the hollow holes are arranged corresponding to the welding strips, and the hollow holes are used to expose the corresponding welding strips.

10. The back contact photovoltaic module according to claim 8, characterized in that: The first back-contact cell and the adjacent second back-contact cell are connected in parallel via the corresponding welding ribbons to form a parallel cell group, and a plurality of the parallel cell groups are connected in series; or The first back-contact cell and the adjacent second back-contact cell are connected in parallel via the corresponding welding strips to form a parallel cell group, and a plurality of the parallel cell groups are connected in parallel with each other.

11. A production device, characterized in that: include: providing a mechanism for providing a first back contact cell, a second back contact cell, and a solder ribbon; Along a first direction, the first back-contact cell includes a first front side and a first back side disposed opposite to each other, and the second back-contact cell includes a second front side and a second back side disposed opposite to each other; wherein the first direction is parallel to a thickness direction of the first back-contact cell and parallel to a thickness direction of the second back-contact cell; a first welding mechanism, configured to weld the welding ribbon to the first back surface of the first back contact cell; and The second welding mechanism is used to weld the welding ribbon to the second back surface of the second back contact cell.

12. The production device according to claim 11, characterized in that The providing mechanism includes a positioning seat, the positioning seat is provided with a groove for positioning the welding strip, and along the first direction, the side of the welding strip away from the bottom wall of the groove protrudes from the groove; and or The first welding mechanism includes a heating mechanism for heating the positioning seat; and or The production device further includes a flipping mechanism, wherein the flipping mechanism is used to flip the first back side of the first back contact battery upward after the welding ribbon is welded to the first back side of the first back contact battery; and or The second welding mechanism includes an infrared heater for heating the welding ribbon; and or The production device also includes a suction mechanism, which is used to suck the electrical isolator after the welding ribbon is welded to the first back side of the first back contact battery, so as to arrange the electrical isolator along the first direction between the side of the welding ribbon close to the second back contact battery and the second back contact battery; wherein, the electrical isolator is provided with a hollow hole for exposing the welding ribbon.

13. A method for manufacturing a back-contact photovoltaic module, characterized in that: include: providing a first back contact cell, a second back contact cell, and a solder ribbon; Along a first direction, the first back-contact cell includes a first front side and a first back side disposed opposite to each other, and the second back-contact cell includes a second front side and a second back side disposed opposite to each other; wherein the first direction is parallel to a thickness direction of the first back-contact cell and parallel to a thickness direction of the second back-contact cell; The soldering ribbon is welded to the first back surface of the first back-contact cell, and the soldering ribbon is welded to the second back surface of the second back-contact cell.

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