Method for manufacturing a photovoltaic module and manufacturing device therefor, photovoltaic module

Abstract

The present disclosure relates to the field of photovoltaics, and provides a manufacturing method of a photovoltaic module, a manufacturing device thereof, and the photovoltaic module. The manufacturing method comprises: providing a cell string comprising a plurality of back contact cell pieces, the plurality of back contact cell pieces comprising a first cell piece at an end of the cell string and a solder strip on the first cell piece, the solder strip comprising a first part on the first cell piece and a second part connected to the first part; bending at least a part of the second part by a preset angle in a second direction, and controlling the second part to be inclined away from an extension direction of the first part; connecting a bus bar to the second part to form a bus part; providing an insulating part at least at an end of the second part connected to the first part; folding the bus part to a side of the insulating part away from the first cell piece, so that the second part forms an included angle with the first part, and a bending part is formed at the second part connected to the first part; and performing a pressing treatment at least on a connection between the first part and the second part, so as to at least improve the convenience of operation and the manufacturing yield in the manufacturing method.

Description

Technical Field

[0001] This disclosure relates to the photovoltaic field, and in particular to a method for manufacturing a photovoltaic module, an apparatus for manufacturing the same, and the photovoltaic module itself. Background Technology

[0002] A photovoltaic (PV) cell is a device that converts solar energy into electrical energy. PV cells utilize the photovoltaic principle to generate charge carriers, which are then extracted using electrodes, thus facilitating the efficient use of electrical energy. A PV module is the core component of a solar power generation system, and it comprises multiple electrically connected PV cells.

[0003] However, there are many challenges in using photovoltaic cells to build photovoltaic modules. For example, the arrangement of multiple photovoltaic cells, the connection of adjacent photovoltaic cells, and the convenience of operating photovoltaic cells need to be considered. Summary of the Invention

[0004] This disclosure provides a method and apparatus for manufacturing photovoltaic modules, as well as a photovoltaic module, which at least improves the ease of operation and manufacturing yield of the manufacturing method.

[0005] This disclosure provides a method for manufacturing a photovoltaic module, comprising: providing a battery string, the battery string including a plurality of back-contact cells arranged along a first direction, the plurality of back-contact cells including a first cell located at an end of the battery string and a solder strip located on the first cell, the solder strip including a first portion located on the first cell and a second portion connected to the first portion; bending at least a portion of the second portion towards a predetermined angle in a second direction, and controlling the second portion to tilt towards an extension direction deviating from the first portion, the second direction being the thickness direction of the back-contact cells; providing a busbar, connecting the busbar to the second portion after bending at the predetermined angle to form a busbar; providing an insulating portion at least at the end of the first portion connected to the second portion; folding the busbar to the side of the insulating portion away from the first cell, such that the second portion forms an angle with the extension direction of the first portion, a local area of ​​the second portion connected to the first portion forming a bent portion, the bent portion forming a bending angle; and applying pressure at least at the connection between the first portion and the second portion to reduce the size of the bending angle.

[0006] Optionally, one of the two first battery cells in a battery string is a second battery cell located near another battery string along the first direction, and the other is a third battery cell; the insulating portion is provided on one of two adjacent second battery cells; in the solder strips electrically connecting two adjacent second battery cells, the solder strip with the first portion located on the second battery cell with the insulating portion is a first solder strip, and the solder strip with the first portion located on another second battery cell is a second solder strip, and the first solder strip and the second solder strip are connected to the same busbar; in the step of bending at least a portion of the second portions toward the second direction at a preset angle, the preset angle of bending the second portion of the first solder strip is greater than or equal to 90°, and the preset angle of bending the second portion of the second solder strip is less than or equal to 90°; and / or, in the step of controlling the second portion to tilt toward the fourth direction, the tilt direction of the second portion of the first solder strip is different from the tilt direction of the second portion of the second solder strip.

[0007] Optionally, after the busbar is folded to the side of the insulating portion away from the first battery cell, the angle formed by the second portion of the first solder strip and the extension direction of the first portion is a first acute angle, and the angle formed by the second portion of the second solder strip and the extension direction of the first portion is a second acute angle, wherein the first acute angle is smaller than the second acute angle.

[0008] Optionally, a plurality of the welding strips are spaced apart on the first battery cell along a third direction, the third direction being the direction intersecting the first direction; a busbar is connected to a plurality of second parts bent at the preset angle to form the busbar; the step of providing the busbar includes: providing an initial busbar, and setting a plurality of spaced slots in the initial busbar to form the busbar; during the process of connecting the busbar to the second parts bent at the preset angle, the second parts are placed in the slots.

[0009] Optionally, after folding the busbar to the side of the insulating portion away from the first solar cell, a portion of the second portion connecting to the first portion constitutes a bent portion; the method of manufacturing the photovoltaic module further includes: providing a spacer strip at least on the side of the bent portion away from the first solar cell; providing a back adhesive film and a back glass on the surface formed by the spacer strip, the solder strip, and the first solar cell; and performing a lamination process to form the photovoltaic module.

[0010] Optionally, the second part has a first side close to the insulating part and a second side opposite to the first side; the step of constituting the busbar includes: connecting the busbar to the first side, or connecting the busbar to the second side.

[0011] Optionally, one of the two first cells in a battery string is a second cell close to another battery string along the first direction, and the other is a third cell; the insulating portion is provided on one of two adjacent second cells; in the solder strips electrically connecting the two adjacent second cells, the solder strip with the first portion located on the second cell with the insulating portion is a first solder strip, and the solder strip with the first portion located on another second cell is a second solder strip, the first solder strip and the second solder strip are connected to the same busbar, and the second portion of the first solder strip is bent at the preset angle in the second direction; the busbar is connected to the second portion of the first solder strip to form the busbar; after folding the busbar to the side of the insulating portion away from the first cell, the method of manufacturing the photovoltaic module further includes: connecting the second portion of the second solder strip to the side of the busbar away from the first cell.

[0012] Optionally, the preset angle is 30°~150°; and / or, when the angle formed by the extension direction of the second part and the first part is an acute angle, the size of the acute angle is 5°~85°.

[0013] This disclosure also provides a photovoltaic module manufacturing apparatus for implementing a photovoltaic module manufacturing method as described in any of the preceding claims, comprising: a conveying module for providing a battery string and a busbar, the battery string including a plurality of back-contact cells arranged along a first direction, the plurality of back-contact cells including a first cell located at an end of the battery string and a solder strip located on the first cell; the solder strip including a first portion located on the first cell and a second portion connected to the busbar; a bending module for bending at least a portion of the second portion toward a predetermined angle in a second direction, and controlling the second portion to tilt toward a fourth direction, the second direction being the thickness direction of the back-contact cells, and the fourth direction being a direction intersecting the second direction; a connecting module for connecting the busbar to the second portion after bending at the predetermined angle to form a busbar, the fourth direction being a direction intersecting the width direction of the busbar; a setting module for setting an insulating portion at least at the end of the first portion connected to the second portion; and a folding module for folding the busbar to the side of the insulating portion away from the first cell, such that the second portion forms an angle with the extension direction of the first portion.

[0014] This disclosure also provides a photovoltaic module, comprising: a battery string including a plurality of back-contact cells arranged along a first direction, the plurality of back-contact cells including a first cell located at an end of the battery string and a solder strip located on the first cell; wherein the solder strip includes a first portion located on the first cell and a second portion connected to the first portion and having a portion located on the side of the first portion away from the first cell, and the second portion being inclined in an extension direction offset from the first portion; an insulating portion at least covering the end of the first portion connected to the second portion; and a busbar connected to the second portion, located on the side of the insulating portion away from the first cell.

[0015] Optionally, when the angle formed by the extension direction of the second part and the first part is an acute angle, the size of the acute angle is 5°~85°.

[0016] Optionally, one of the two first battery cells in a battery string is a second battery cell close to another battery string along the first direction, and the other is a third battery cell; the insulating portion is located on one of the two adjacent second battery cells; in the solder strips electrically connecting the two adjacent second battery cells, the solder strip with the first portion located on the second battery cell where the insulating portion is provided is a first solder strip, and the solder strip with the first portion located on another second battery cell is a second solder strip, and the first solder strip and the second solder strip are connected to the same busbar; the inclination direction of the second portion of the first solder strip is different from the inclination direction of the second portion of the second solder strip.

[0017] Optionally, the angle formed by the second portion of the first solder strip and the extension direction of the first portion is a first acute angle, and the angle formed by the second portion of the second solder strip and the extension direction of the first portion is a second acute angle, wherein the first acute angle is smaller than the second acute angle.

[0018] Optionally, the size of the first acute angle is 5° to 45°, and the size of the second acute angle is 30° to 85°.

[0019] Optionally, multiple welding strips are spaced apart on the first battery cell along a third direction, the third direction being the direction intersecting the first direction; the busbar is provided with multiple slots arranged at intervals, and the second part is located in the slots.

[0020] Optionally, the partial area connecting the second part to the first part constitutes a bent portion, the bent portion forming a bending angle; wherein the size of the bending angle is not greater than 60°; and / or, the photovoltaic module further includes: a spacer strip, at least located on the side of the bent portion away from the first solar cell.

[0021] Optionally, the busbar is located between at least a portion of the second portion and the insulating portion, or the busbar is located on the side of at least a portion of the second portion away from the insulating portion.

[0022] Optionally, the battery string has two opposite edges along the first direction; the first battery cell also includes an edge solder joint, the solder strip is connected to the edge solder joint and is located on the side of the edge solder joint away from the first battery cell; along the first direction, the distance between the edge solder joint and the edge is a first distance, and the distance between the busbar and the edge is a second distance, the second distance being greater than the first distance.

[0023] Optionally, the photovoltaic module further includes: an adhesive dot connecting the first part and the first solar cell, wherein the distance between the adhesive dot and the edge is a third distance, and the first distance is greater than the third distance.

[0024] The technical solution provided in this disclosure has at least the following advantages: On the one hand, by bending at least a portion of the second part at a predetermined angle in the second direction, the second part is raised above the back contact cell, providing ample operating space on both sides of the second part along the first direction. Furthermore, the raised second part can be connected to the busbar above the back contact cell, providing operators with sufficient operating space to connect the second part to the busbar. This improves the ease of operation in the manufacturing process and ensures a good connection quality between the second part and the busbar. On the other hand, by bending at least a portion of the second part at a predetermined angle while further controlling the second part to tilt in the fourth direction, after the busbar is folded to the side of the insulating part away from the first cell, the extension directions of the second and first parts in the same solder strip form an angle. This avoids the second and first parts stacking along the second direction, thereby reducing the overall thickness at the connection between the solder strip and the busbar. This reduces the risk of microcracks or breakage under pressure in the photovoltaic module, thus improving the manufacturing yield of the photovoltaic module. Furthermore, simultaneously completing the operation of bending the second part at a preset angle and controlling the tilt of the second part helps to further simplify the manufacturing process of photovoltaic modules. Attached Figure Description

[0025] One or more embodiments are illustrated by way of example with corresponding pictures in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Unless otherwise stated, the pictures in the accompanying drawings do not constitute a limitation on scale. In order to more clearly illustrate the technical solutions in the embodiments of this disclosure or the conventional technology, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A process flow diagram of a method for manufacturing a photovoltaic module according to an embodiment of this disclosure; Figure 2 This is a partial top view of a battery string structure in a photovoltaic module manufacturing method provided in an embodiment of the present disclosure; Figure 3 This is a partial cross-sectional view of the structure of a photovoltaic module after it has been configured as a busbar in a method for manufacturing a photovoltaic module according to an embodiment of this disclosure. Figure 4 This is a partial top view of a photovoltaic module after the busbar is folded in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure. Figure 5 This is a partial top view of the structure of the solder strip after the busbar is folded in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure. Figure 6 A circuit diagram of a photovoltaic module in a method for manufacturing a photovoltaic module according to an embodiment of this disclosure; Figure 7 This is a first partial top view of the photovoltaic module in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure; Figure 8 This is a partial cross-sectional view of the busbar structure in a photovoltaic module manufacturing method according to an embodiment of the present disclosure. Figure 9 for Figure 7 A partial top view of the first and second solder strips in the photovoltaic module shown; Figure 10 This is a partial top view of the initial busbar structure in a photovoltaic module manufacturing method provided in an embodiment of the present disclosure; Figure 11 This is a partial top view of a busbar structure in a photovoltaic module manufacturing method provided in an embodiment of the present disclosure; Figure 12 for Figure 7 The diagram shows a sectional view of a photovoltaic module along the first cross-sectional direction AA1. Figure 13 for Figure 7 The diagram shows a sectional view of a photovoltaic module along the second cross-section direction BB1. Figure 14 This is a second partial top view of the photovoltaic module in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure; Figure 15 for Figure 14 The diagram shows a sectional view of a photovoltaic module along the second cross-section direction BB1. Figure 16 This is a third partial top view of the photovoltaic module in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure; Figure 17 for Figure 16 The diagram shows a sectional view of a photovoltaic module along the third section direction CC1. Figure 18 This is a fourth partial top view of the photovoltaic module in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure; Figure 19 for Figure 18 The diagram shows a sectional view of a photovoltaic module along the third section direction CC1. Figure 20 for Figure 7 The diagram shows another sectional view of the photovoltaic module along the first cross-section direction AA1. Figure 21 for Figure 9 The diagram shows a sectional view of a photovoltaic module along the fourth section direction EE1. Figure 22 for Figure 16 The diagram shows a sectional view of a photovoltaic module along the first cross-sectional direction AA1. Figure 23 for Figure 9 The diagram shows another inflection section of the photovoltaic module along the fourth section direction EE1. Figure 24 This is a schematic diagram of another partial cross-sectional structure of the busbar in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure; Figure 25 This is a partial cross-sectional view of the busbar structure in a photovoltaic module manufacturing method provided in an embodiment of the present disclosure. Figure 26 A schematic diagram of a functional module of a photovoltaic module manufacturing apparatus provided in another embodiment of this disclosure; Figure 27 A cross-sectional structural diagram of a bent portion in a photovoltaic module provided in yet another embodiment of this disclosure; Figure 28Another cross-sectional structural diagram of the bent portion in a photovoltaic module provided in yet another embodiment of this disclosure; Figure 29 This is a partial top view of a photovoltaic module provided in another embodiment of the present disclosure.

[0027] Explanation of reference numerals in the attached figures: 100. Battery string; 110. Edge; 101. Back contact cell; 111. First cell; 1111. Second cell; 1112. Third cell; 131. Fourth cell; 121. Edge solder joint; 102. Solder ribbon; 1021. First solder ribbon; 1022. Second solder ribbon; 1023. Third solder ribbon; 112. First part; 122. Second part; 1221. Bend; 122a. First side; 12 2b. Second side; 20. Connecting strip; 103. Busbar; 113. Initial busbar; 123. Slot; 104. Busbar section; 105. Insulation section; 106. Pad strip; 107. Back adhesive film; 117. Front adhesive film; 108. Back glass; 118. Front glass; 109. Conveying module; 119. Bending module; 129. Connecting module; 139. Setting module; 149. Folding module; 159. Adhesive dot. Detailed Implementation

[0028] As can be seen from the background technology, there are still many challenges in the process of constructing photovoltaic modules using photovoltaic cells.

[0029] This disclosure provides a method and apparatus for manufacturing a photovoltaic module, and the photovoltaic module itself. In the manufacturing method, on one hand, at least a portion of the second part is bent at a predetermined angle in a second direction, causing the second part to tilt upwards above the back contact cell, providing ample operating space on both sides of the second part along a first direction. Furthermore, the tilted second part can be connected to a busbar above the back contact cell, providing sufficient operating space for the operator to connect the second part to the busbar. This improves the ease of operation in the manufacturing method and ensures a good connection quality between the second part and the busbar. On the other hand, while bending at least a portion of the second part at the predetermined angle, the second part is also tilted in a fourth direction. After the busbar is folded to the side of the insulating part away from the first cell, the extension directions of the second and first parts in the same solder strip form an angle. This avoids the second and first parts stacking along the second direction, thereby reducing the overall thickness at the connection between the solder strip and the busbar, thus reducing the risk of microcracks or breakage under pressure in the photovoltaic module and improving the manufacturing yield of the photovoltaic module. Furthermore, simultaneously completing the operation of bending the second part at a preset angle and controlling the tilt of the second part helps to further simplify the manufacturing process of photovoltaic modules.

[0030] In the description of the embodiments of this disclosure, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary or secondary relationship of the indicated technical features. In the description of the embodiments of this disclosure, "multiple" means two or more (including two), unless otherwise explicitly defined. Similarly, "multiple sets" refers to two or more sets (including two sets), and "multiple pieces" refers to two or more pieces (including two pieces).

[0031] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this disclosure. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0032] In the description of the embodiments of this disclosure, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0033] In the description of the embodiments of this disclosure, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the embodiments of this disclosure and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of this disclosure. For example, if the device or element in the illustration is inverted, then the element described as "below," "under," "below," or "bottom" of other elements or features will be oriented "above" or "top" of said other elements or features. Therefore, the term "below" may, depending on the context in which the term is used, encompass both above and below orientations, which will be obvious to those skilled in the art. Materials may be oriented in other ways (e.g., rotated 90 degrees, inverted, flipped), and the spatial relative descriptive terms used herein may be interpreted accordingly.

[0034] In the description of the embodiments of this disclosure, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0035] In the description of the embodiments of this disclosure, electrical connection between one component and another means that both components are made of conductive materials, and the two components are in direct contact and connected or connected via other conductive materials. Therefore, when the photovoltaic module is generating electricity, current flows between the two components. Electrical contact between one component and another means that the two components are not only in contact, but also, because both components are made of conductive materials, current flows between the two components when the photovoltaic module is generating electricity.

[0036] In the description of embodiments of this disclosure, the terms "about," "approximately," "roughly," or "about" for a numerical value referring to a specific parameter include the numerical value, and those skilled in the art will understand that the deviation from the numerical value is within acceptable tolerances of the specific parameter. For example, "about" or "about" for a numerical value may include additional numerical values ​​that are in the range of 90.0% to 110.0% of the numerical value, such as in the range of 95.0% to 105.0%, 97.5% to 102.5%, 99.0% to 101.0%, 99.5% to 100.5%, or 99.9% to 100.1%.

[0037] In the accompanying drawings corresponding to the embodiments of this disclosure, the thickness and / or area of ​​layers, films, panels, regions, etc., are enlarged for better understanding and ease of description. Throughout the specification, the same reference numerals denote the same elements. Furthermore, when describing a component as being "generally" formed on another component, it means that the component is not formed on the entire surface (or front surface) of the other component, nor on a portion of the edge of the entire surface.

[0038] In the description of embodiments of this disclosure, when a component "includes" another component, other components are not excluded unless otherwise stated, and may be further included. When a component (such as a layer, film, region, or substrate) is described as being on or on the surface of another component, the component may be "directly" located on the surface of the other component, or there may be an intermediate component between the two components. Conversely, when a component is described as being on the surface of another component, or a component is "directly" on another component, or another component is formed or disposed on the surface of a component, it indicates that there is no intermediate component between the two components. For simplicity and clarity, various components may be drawn at any scale. In the drawings, some components may be omitted for simplicity.

[0039] The terminology used in the description of the various embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various embodiments and the appended claims, the term "the component" is also intended to include the plural form unless the context clearly indicates otherwise.

[0040] The “components” mentioned above can refer to layers, films, regions, parts, structures, etc.

[0041] The embodiments of this disclosure will now be described in detail with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the embodiments of this disclosure to facilitate a better understanding of the embodiments. However, the technical solutions claimed in the embodiments of this disclosure can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0042] This disclosure provides a method for manufacturing a photovoltaic module. The method for manufacturing a photovoltaic module according to an embodiment of this disclosure will be described in detail below with reference to the accompanying drawings.

[0043] Reference Figures 1 to 5 , Figure 1 A process flow diagram of a method for manufacturing a photovoltaic module according to an embodiment of this disclosure; Figure 2 This is a partial top view of a battery string structure in a photovoltaic module manufacturing method provided in an embodiment of the present disclosure; Figure 3 This is a partial cross-sectional view of the structure of a photovoltaic module after it has been configured as a busbar in a method for manufacturing a photovoltaic module according to an embodiment of this disclosure. Figure 4 This is a partial top view of a photovoltaic module after the busbar is folded in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure. Figure 5 This is a partial top view of the structure of the solder strip after the busbar is folded in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure.

[0044] The manufacturing method of photovoltaic modules includes at least the following steps: S1: Provide a battery string 100, the battery string 100 includes a plurality of back contact battery pieces 101 arranged along a first direction X, the plurality of back contact battery pieces 101 include a first battery piece 111 located at the end of the battery string 100 and a solder strip 102 located on the first battery piece 111, the solder strip 102 includes a first part 112 located on the first battery piece 111 and a second part 122 connected to the first part 112.

[0045] S2: Bend at least a portion of the second part 122 toward the second direction Y by a preset angle γ, and control the second part 122 to tilt toward the fourth direction, where the second direction Y is the thickness direction of the back contact battery sheet 101, and the fourth direction is the direction that intersects with the second direction Y.

[0046] S3: Provide a busbar 103 and connect the busbar 103 to the second part 122 after bending at a preset angle γ to form a busbar 104. The fourth direction is the direction that intersects with the width direction of the busbar 103.

[0047] S4: An insulating part 105 is provided at least at the end of the first part 112 that connects to the second part 122.

[0048] S5: Fold the bus section 104 to the side of the insulating section 105 away from the first battery cell 111, so that the extension direction of the second section 122 forms an angle β with the extension direction of the first section 112.

[0049] It is worth noting that the first direction X can be regarded as the extension direction of the first part 112. Before proceeding to step S2, refer to Figure 2 The solder ribbon 102 extends along the first direction X. In its initial state, the first portion 112 and the second portion 122 extend in almost the same direction, ideally overlapping. Furthermore, along the first direction X, the length of the solder ribbon 102 in its initial state is greater than the length of the back contact cell 101. Specifically, the first portion 112 is located on the back contact cell 101, but the second portion 122 protrudes beyond the back contact cell 101. Thus, when the solder ribbon 102 is in its initial state, and multiple back contact cells 101 are arranged along the first direction X, if the first portion 112 of a solder ribbon 102 is located on one back contact cell 101, the second portion 122 of that solder ribbon 102 will be located on another back contact cell 101.

[0050] Based on this, on the one hand, in step S2, refer to Figure 3By bending at least a portion of the second part 122 towards the second direction Y at a predetermined angle γ, the second part 122 can be prevented from adhering to the back contact battery sheet 101 along the first direction X. In other words, by making the second part 122 protrude above the back contact battery sheet 101, the two opposite sides of the second part 122 along the first direction X have a large operating space. Furthermore, in step S3, the connection between the protruding second part 122 and the busbar 103 can be performed above the back contact battery sheet 101, providing the operator with sufficient operating space to achieve the connection between the second part 122 and the busbar 103. This not only helps to improve the ease of operation in the manufacturing method, but also helps to ensure a good connection quality between the second part 122 and the busbar 103.

[0051] On the other hand, in conjunction with reference Figure 4 and Figure 5 In step S2, the second part 122 is simultaneously controlled to tilt in the fourth direction, which can also be understood as tilting away from the extension direction of the first part 112. Therefore, after step S5, in the same solder strip 102, the extension directions of the first part 112 and the folded second part 122 included in the busbar 104 are different, i.e., the extension directions of the second part 122 and the first part 112 form an angle β. This avoids the second part 122 and the first part 112 from stacking along the second direction Y, allowing the second part 122 to be positioned above the interval between two adjacent first parts 112. This reduces the overall thickness at the connection between the solder strip 102 and the busbar 103, thereby reducing the risk of microcracks or breakage under pressure in the subsequent photovoltaic module, and thus improving the manufacturing yield of the photovoltaic module. Furthermore, simultaneously performing the operation of bending the second part 122 at a preset angle γ and controlling the tilt of the second part 122 in step S2 further simplifies the manufacturing process of the photovoltaic module.

[0052] It should be noted that the operation of folding the second part 122 onto the back contact battery cell 101 is performed in two steps. The first step, in step S2, involves bending the second part 122 in the second direction Y at a preset angle γ. The second step, in step S5, involves folding the busbar 104 onto the side of the insulating part 105 away from the first battery cell 111. In other words, other steps are interspersed between the two bending operations to improve the portability of the operator or equipment in controlling the second part 122 to tilt in the fourth direction, and to improve the portability of the operator or equipment in connecting the busbar 103 and the second part 122. Furthermore, a detailed example of the fourth direction will be provided later.

[0053] Furthermore, the angle β formed by the extension directions of the second part 122 and the first part 112 can be: the angle formed by the orthogonal projections of the first part 112 and the second part 122 of the same solder strip 102 onto the back contact cell 101 after step S5.

[0054] In some cases, the method of connecting the busbar 103 to the second part 122 after bending at a preset angle γ to form the busbar 104 in step S3 may include: placing welding pads on opposite sides of the raised second part 122 along the first direction X, and then performing heating and pressure welding to achieve the connection between the busbar 103 and the second part 122.

[0055] In some cases, after step S2, the insulating portion 105 can be installed on the first part 112 after the connection between the busbar 103 and the second part 122 is established. In other cases, the installation of the insulating portion 105 can be advanced to before the connection between the busbar 103 and the second part 122 is established. For example, the insulating portion 105 can be installed on the first part 112 immediately after step S2, or it can be installed on the first part 112 before step S2. In other words, the installation of the insulating portion 105 can be performed before step S5.

[0056] The following will describe in more detail a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure, with reference to the accompanying drawings.

[0057] In some embodiments, reference Figure 3 The preset angle γ can be 30°~150°; for example, it can be 30°~60°, 60°~90°, 90°~120°, or 120°~150°. Optionally, the preset angle γ can be 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, or 150°, etc.

[0058] It is worth noting that if the preset angle γ of the second part 122 bending in the second direction Y is less than 30° or greater than 150°, the distance between the second part 122 and the back contact battery piece 101 along the second direction Y is relatively small. In other words, after bending at the preset angle γ, the second part 122 still fits relatively snugly against the back contact battery piece 101, thus limiting the operating space. Based on this, designing the preset angle γ to be 30°~150° is beneficial to increasing the degree of tilting of the second part 122 relative to the back contact battery piece 101, thereby ensuring that sufficient operating space is reserved on both sides of the second part 122 after bending at the preset angle γ.

[0059] In some embodiments, in conjunction with reference Figure 4 and Figure 5When the angle β formed by the extension directions of the second part 122 and the first part 112 is an acute angle, the size of the acute angle can be 5° to 85°, for example, it can be 5° to 15°, 15° to 25°, 25° to 35°, 35° to 45°, 45° to 55°, 55° to 65°, 65° to 75°, or 75° to 85°. Optionally, the size of the acute angle β can be 5°, 10°, 15°, 20°, 25°, 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, or 85°, etc.

[0060] It is worth noting that, depending on whether the first part 112 is located on the first battery cell 111 at the end of the entire assembly of at least two adjacent battery strings 100, or on the first battery cell 111 at the middle of the entire assembly of at least two adjacent battery strings 100, the angle β formed between the second part 122 and the solid first part 112 can be either an obtuse angle or an acute angle. Based on this, using a plane perpendicular to the second direction Y as the projection plane, to clearly show the intersection of the second part 122 and the first part 112 on this projection plane, the extension direction of the first part 112 is used as the reference direction. The angle formed between the second part 122 and this reference direction is a complementary obtuse angle and an acute angle. The acute angle formed between the second part 122 and this reference direction is uniformly used as the measurement standard; that is, when the angle β formed between the second part 122 and the extension direction of the first part 112 is an acute angle, the size of this acute angle is designed to be 5°~85°.

[0061] If the angle β formed by the extension directions of the second part 122 and the first part 112 is less than 5°, after folding the busbar 104 to the side of the insulating part 105 away from the first battery cell 111, the tilt angle of the second part 122 is small, increasing the risk of the connection between the first part 112 and the second part 122 stacking along the second direction Y. If the angle β formed by the extension directions of the second part 122 and the first part 112 is greater than 85°, after folding the busbar 104 to the side of the insulating part 105 away from the first battery cell 111, the tilt angle of the second part 122 is large, and the bending stress at the connection between the first part 112 and the second part 122 is large, increasing the risk of the first part 122 detaching from the first part 112. Therefore, designing the acute angle formed by the extension directions of the second part 122 and the first part 112 to be between 5° and 85° helps to ensure that the connection between the first part 112 and the second part 122 does not stack along the second direction Y, while also preventing the connection between the first part 112 and the second part 122 from breaking.

[0062] In some embodiments, in conjunction with reference Figures 6 to 8A battery string 100 includes two first battery cells 111, one of which is a second battery cell 1111 located near another battery string 100 along the first direction X, and the other is a third battery cell 1112; an insulating portion 105 is provided on one of the two adjacent second battery cells 1111; in the solder strips 102 that electrically connect the two adjacent second battery cells 1111, the solder strip 102 with the first portion 112 located on the second battery cell 1111 provided with the insulating portion 105 is the first solder strip 1021, and the solder strip 102 with the first portion 112 located on the other second battery cell 1111 is the second solder strip 1022, and the first solder strip 1021 and the second solder strip 1022 are connected to the same busbar 103.

[0063] It should be noted that, Figure 6 A circuit diagram of a photovoltaic module in a method for manufacturing a photovoltaic module according to an embodiment of this disclosure; Figure 7 This is a first partial top view of the photovoltaic module in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure; Figure 8 This is a partial cross-sectional view of the busbar structure in a photovoltaic module manufacturing method according to an embodiment of this disclosure. Furthermore, to distinguish the first solder strip 1021 and the second solder strip 1022, Figure 7 and Figure 8 The first solder strip 1021 is indicated by a thicker solid line, while the second solder strip 1022 is indicated by a thinner solid line.

[0064] Furthermore, the two first battery cells 111 located in a single battery string 100 are respectively the second battery cell 1111 and the third battery cell 1112. The difference between the second battery cell 1111 and the third battery cell 1112 is that, along the first direction X, the second battery cell 1111 of one battery string 100 is adjacent to another battery string 100, while the third battery cell 1112 of one battery string 100 is not adjacent to another battery string 100.

[0065] A single battery string 100 may further include at least one fourth battery cell 131 located between two first battery cells 111, that is, between the second battery cell 1111 and the third battery cell 1112. The first battery cells 111 can be considered as end battery cells of the single battery string 100. Based on the arrangement of the multiple battery strings 100, the two first battery cells 111 included in the single battery string 100 are of two types: second battery cell 1111 and third battery cell 1112. The fourth battery cell 131 can be considered as an intermediate battery cell of the single battery string 100.

[0066] Therefore, in some cases, in conjunction with references Figure 7 and Figure 8In the step of bending at least a portion of the second portion 122 toward the second direction Y by a predetermined angle γ, the predetermined angle γ of the bending of the second portion 122 of the first solder strip 1021 is greater than or equal to 90°, and the predetermined angle γ of the bending of the second portion 122 of the second solder strip 1022 is less than or equal to 90°.

[0067] The preset angle γ for bending the second part 122 of the first solder ribbon 1021 can be defined as the first preset angle γ1, and the preset angle γ for bending the second part 122 of the second solder ribbon 1022 can be defined as the second preset angle γ2. Since the insulating part 105 is disposed on the second battery cell 1111 where the first part 112 of the first solder ribbon 1021 is located, the second part 122 of the first solder ribbon 1021 needs to be bent at approximately 180°, that is, folded over the second battery cell 1111. However, the second part 122 of the second solder ribbon 1022 does not need to be folded over; it only needs to overlap the second battery cell 1111.

[0068] In other words, for the first solder strip 1021, taking the connection point between the second part 122 and the first part 112 as the base point, the second part 122 needs to be bent clockwise around the base point at a first preset angle γ1 in step S2. Further, in step S5, it continues to bend clockwise around the base point to the side of the insulating part 105 away from the first battery cell 111. In the two steps, the angle of the second part 122 bending clockwise around the base point is close to 180°. For the second solder strip 1022, taking the connection point between the second part 122 and the first part 112 as the base point, the second part 122 needs to be bent counterclockwise around the base point at a second preset angle γ2 in step S2. Subsequently, in step S5, the second part 122 reverses the direction, that is, it bends clockwise around the base point to a position close to the second preset angle γ2, so that the second part 122 is located on the side of the insulating part 105 away from the first battery cell 111. As can be seen, in the final photovoltaic module, compared to the second part 122 of the first solder ribbon 1021 which needs to be folded by about 180°, the second part 122 of the second solder ribbon 1022 hardly needs to be bent much, and only needs to be overlapped on the side of the insulating part 105 away from the first cell 111.

[0069] Based on the difference in the required bending angles of the second part 122 of the first solder strip 1021 and the second part 122 of the second solder strip 1022 in the final photovoltaic module, the first preset angle γ1 is designed to be greater than or equal to 90° and the second preset angle γ2 is designed to be less than or equal to 90°. This not only improves the ease of operation in step S3 to connect the busbar 103 and the second part 122, but also helps to minimize the bending angle of the second solder strip 1022 and improve the mechanical strength of the second solder strip 1022.

[0070] It should be noted that, ideally, the first preset angle γ1 and the second preset angle γ2 are complementary.

[0071] In some cases, refer to Figure 7 and Figure 9 , Figure 9 for Figure 7 The diagram shows a partial top view of the first and second solder strips in the photovoltaic module. In the step of controlling the second part 122 to tilt in the fourth direction, the tilt direction of the second part 122 of the first solder strip 1021 is different from the tilt direction of the second part 122 of the second solder strip 1022. Specifically, the tilt direction of the second part 122 of the first solder strip 1021 can be defined as a first tilt direction K1, and the tilt direction of the second part 122 of the second solder strip 1022 can be defined as a second tilt direction K2. Thus, the fourth direction is either the first tilt direction K1 or the second tilt direction K2.

[0072] If the first tilt direction K1 and the second tilt direction K2 are designed to be different, then in the final photovoltaic module, it is possible to control that the second part 122 of the first solder strip 1021 and the second solder strip 1022 connected to the same busbar 103 are located on different areas of the second cell 1111, which effectively avoids the second part 122 of the first solder strip 1021 and the second part 122 of the second solder strip 1022 being stacked along the second direction Y, thereby further reducing the risk of microcracks or cell breakage in the process of manufacturing photovoltaic modules.

[0073] In some examples, reference Figure 7 or Figure 9 With the first direction X as the reference, the first tilt direction K1 can deviate downward from the first direction X, and the second tilt direction K2 can deviate upward from the first direction X.

[0074] It is worth noting that, for the third battery cell 1112, only the solder ribbon 102 of the first part 112 located on the third battery cell 1112 needs to be connected to the busbar 103. In other words, the portion of the busbar 103 located on the third battery cell 1112 only needs to be connected to the solder ribbon 102 of the first part 112 located on the third battery cell 1112. However, for the second battery cell 1111, the portion of the busbar 103 located on one of the two adjacent second battery cells 1111 needs to be connected to both the solder ribbon 102 of the first part 112 located on one second battery cell 1111 and the solder ribbon 102 of the first part 112 located on the other second battery cell 1111.

[0075] In some examples, in conjunction with references Figures 7 to 9After the busbar 104 is folded to the side of the insulating part 105 away from the first battery cell 111, the angle β formed by the extension direction of the second part 122 of the first solder strip 1021 and the first part 112 is the first acute angle β1, and the angle β formed by the extension direction of the second part 122 of the second solder strip 1022 and the first part 112 is the second acute angle β2. The first acute angle β1 can be smaller than the second acute angle β2.

[0076] It is worth noting that in the final photovoltaic module, compared to the first solder ribbon 1021, which requires a 180° fold in its second portion 122, the second portion 122 of the second solder ribbon 1022 requires almost no significant folding; it simply overlaps the insulating portion 105 on the side away from the first solar cell 111. Thus, during the process of bending the second portion 122 towards the second direction Y at a predetermined angle γ, the bending internal stress experienced by the first solder ribbon 1021 during the bending process is greater than that experienced by the second solder ribbon 1022, considering the bending angle of the second portion 122.

[0077] Based on this, during the process of controlling the second part 122 to tilt in the fourth direction, the first acute angle β1 is designed to be smaller than the second acute angle β2 in terms of the tilt angle of the second part 122. This helps to reduce the bending internal stress experienced by the first solder strip 1021 during the tilting process compared to the bending internal stress experienced by the second solder strip 1022. This balances the bending internal stress experienced by the first solder strip 1021 and the second solder strip 1022 in step S2, thereby improving the manufacturing yield of the photovoltaic module. Step S2 includes two processes: bending and tilting.

[0078] In some embodiments, reference Figure 2 , Figure 4 or Figure 7 Multiple solder strips 102 are spaced apart along a third direction Z on the first battery cell 111, where the third direction Z is the direction intersecting with the first direction X; a busbar 103 is connected to multiple second parts 122 after being bent at a preset angle γ to form a busbar 104.

[0079] Reference Figure 10 and Figure 11 The steps for providing bus bar 103 may include: referring to Figure 10 Provides initial bus bar 113; in conjunction with reference Figure 10 and Figure 11 Multiple spaced slots 123 are provided in the initial busbar 113 to form the busbar 103; referring to the reference Figure 11 and Figure 8 During the process of connecting the busbar 103 to the second part 122 after bending at a preset angle γ, the second part 122 is placed in the slot 123.

[0080] in, Figure 10 This is a partial top view of the initial busbar structure in a photovoltaic module manufacturing method provided in an embodiment of the present disclosure; Figure 11 This is a partial top view of a busbar structure in a photovoltaic module manufacturing method provided in an embodiment of the present disclosure.

[0081] It is worth noting that in step S2, not only is the second part 122 bent, but it is also tilted, resulting in a significant degree of bending. Furthermore, the second part 122 is the end of the solder strip 102, and most of the area of ​​the solder strip 102, i.e., the first part 112, is located on the back contact cell 101. Thus, after step S2 and before step S3, the tilted second part 122 is prone to deformation or springback. Based on this, the busbar 103 is designed with a slot 123 for placing the second part 122. This slot 123 helps to limit the movement of the second part 122, ensuring that the angle β formed by the extension directions of the second part 122 and the first part 112 is within a preset range.

[0082] In some embodiments, reference Figure 12 , Figure 12 for Figure 7 The diagram shows a folded cross-sectional structure of a photovoltaic module along the first cross-sectional direction AA1. After the current-collecting part 104 is folded to the side of the insulating part 105 away from the first cell 111, a local area in the second part 122 that connects to the first part 112 forms a bending part 1221, and the bending part 1221 forms a bending angle α. The manufacturing method of the photovoltaic module may further include: at least pressurizing the connection between the first part 112 and the second part 122 to reduce the size of the bending angle α.

[0083] It is worth noting that, along the second direction Y, the second part 122 is bent at a preset angle γ (refer to...). Figure 8 If the bent portion 1221 arches away from the back contact cell 101 after the subsequent lamination process, the arched bent portion 1221 may intrude into other film layers, thereby damaging the structural stability of the photovoltaic module.

[0084] In some cases, continue to refer to Figure 12The manufacturing method of a photovoltaic module may further include: setting a back film 107 and a back glass 108 on the surface jointly formed by the solder ribbon 102 and the first solar cell 111; and performing a lamination process to form a photovoltaic module. During the lamination process, the back film 107 has a certain degree of fluidity, and the arched bends 1221 may penetrate into the back film 107, and even come into contact with the back glass 108, potentially increasing the risk of breakage of the back glass 108. Furthermore, the arched bends 1221 may squeeze the back film 107 at that location to other positions, such as to the edge of the back contact solar cell 101, increasing the risk of adhesive overflow.

[0085] Based on this, after bending the second part 122 at a preset angle γ, before laminating, at least the connection between the first part 112 and the second part 122 is pressurized to reduce the size of the bending angle α, for example, so that the size of the bending angle is not higher than 60°. In other words, by applying pressure to the bent portion 1221, the degree to which the bent portion 1221 arches away from the back contact cell 101 is significantly reduced, or the arching of the bent portion 1221 away from the back contact cell 101 is directly prevented. This reduces the size of the bending angle α formed by the bent portion 1221, thereby preventing the bent portion 1221 from intruding into the back adhesive film 107 and further preventing the bent portion 1221 from contacting the back glass 108, thus reducing the risk of the back glass 108 breaking. It also reduces the compression on the back adhesive film 107 located at the connection between the first part 112 and the second part 122, preventing the back adhesive film 107 at the connection between the first part 112 and the second part 122 from being too thin, thereby reducing the risk of adhesive overflow during the lamination process and improving the structural stability and yield of the final photovoltaic module.

[0086] In some cases, continue to refer to Figure 12 The method of pressurizing at least the connection between the first part 112 and the second part 122 may include: providing a pressurizing module (not shown in the figure) to pressurize at least the opposite sides of the back contact battery sheet 101 along the second direction Y, so as to pressurize the opposite sides of the connection between the first part 112 and the second part 122 along the second direction Y, thereby reducing the size of the bending angle α.

[0087] In some examples, the pressurization module may be a clamping component (not shown) that clamps the connection between the first part 112 and the second part 122 and the side of the back contact cell 101 away from the solder strip 102.

[0088] In some examples, continue to refer to Figure 12The step of providing the back contact solar cell 101 may include: providing a front glass 118; setting a front adhesive film 117 on the front glass 118; setting the back contact solar cell 101 on the side of the front adhesive film 117 away from the front glass 118, with the side of the back contact solar cell 101 away from the solder ribbon 102 connected to the front adhesive film 117. Based on this, when the pressure module is a clamping component, the connection between the first part 112 and the second part 122 and the side of the front glass 118 away from the front adhesive film 117 can be clamped respectively. It should be noted that after lamination, the completed photovoltaic module can be rotated 180° so that the front glass 118 faces upwards.

[0089] In some embodiments, reference Figure 12 After folding the current collector 104 to the side of the insulating portion 105 away from the first solar cell 111, a partial area in the second portion 122 connecting the first portion 112 forms a bending portion 1221. The method of manufacturing a photovoltaic module may further include: providing a spacer strip 106 at least on the side of the bending portion 1221 away from the first solar cell 111, in other words, providing a spacer strip 106 at least at the connection between the first portion 112 and the second portion 122; providing a back adhesive film 107 and a back glass 108 on the surface formed by the spacer strip 106, the solder ribbon 102 and the first solar cell 111; and performing a lamination process to form a photovoltaic module.

[0090] Thus, during the lamination process, a spacer strip 106 is also placed between the bent portion 1221 and the back adhesive film 107. The spacer strip 106 provides cushioning, reducing the pressure of the bent portion 1221 on the back adhesive film 107 and effectively preventing the bent portion 1221 from penetrating into the back adhesive film 107. This prevents the thickness of the back adhesive film 107 at the connection between the first portion 112 and the second portion 122 from being reduced, and also prevents the bent portion 1221 from contacting the back glass 108 at the connection between the first portion 112 and the second portion 122, thereby improving the structural stability and yield of the final photovoltaic module.

[0091] It should be noted that, during the lamination process, to effectively prevent the bent portion 1221 from intruding into the back adhesive film 107, either pressure can be applied to the connection between the first portion 112 and the second portion 122 before lamination, or a spacer strip 106 can be provided on the side of the bent portion 1221 away from the first solar cell 111 before lamination. In other words, either pressure application or the use of the spacer strip 106 can be chosen, or both can be present in a single photovoltaic module manufacturing method.

[0092] In some embodiments, in conjunction with reference Figure 15 and Figure 17The second part 122 may have a first side 122a near the insulating part 105 and a second side 122b opposite to the first side 122a. In other words, along the second direction Y, the second part 122 has an upper side and a lower side, wherein the first side 122a may be defined as the lower side and the second side 122b may be defined as the upper side.

[0093] In some cases, refer to Figure 17 The steps of constructing the busbar 104 may include connecting the busbar 103 to the first side 122a.

[0094] It should be noted that, in one cross-sectional structural diagram, along the direction away from the back contact cell 101, the first part 112, the insulating part 105, and the busbar 103 are stacked, and the second part 122 is not provided above the busbar 103 which is directly opposite the first part 112 in the second direction Y. The bent part 1221 is located on the side of the insulating part 105 and the busbar 103 near the edge of the back contact cell 101. In another cross-sectional structural diagram, the parts of the first part 112, the insulating part 105, and the second part 122, except for the bent part 1221, are stacked.

[0095] In other cases, refer to Figure 15 The steps of forming the busbar 104 include: connecting the busbar 103 to the second side 122b.

[0096] Thus, in one cross-sectional view along the direction away from the back contact cell 101, the insulating portion 105, the portion of the second portion 122 excluding the bending portion 1221, and the busbar 103 are stacked; in another cross-sectional view, the first portion 112, the insulating portion 105, and the busbar 103 are stacked, and the second portion 122 is not provided above the busbar 103 which is directly opposite the first portion 112 in the second direction Y. The bending portion 1221 is located on the side of the insulating portion 105 close to the back contact cell 101, and the busbar 103 is located above the bending portion 1221.

[0097] The following describes in detail the steps for forming the junction 104.

[0098] In some cases, refer to Figure 7 and Figures 13 to 19 A battery string 100 includes two first battery cells 111, one of which is a second battery cell 1111 located close to another battery string 100 along a first direction X, and the other is a third battery cell 1112; a single battery string 100 may also include at least one fourth battery cell 131 located between the two first battery cells 111, that is, between the second battery cell 1111 and the third battery cell 1112. The positional relationship between the third battery cell 1112 and the insulating portion 105, the solder ribbon 102 and the busbar 103 will be described in detail below.

[0099] In some examples, in conjunction with references Figure 7 and Figure 13 , Figure 13 for Figure 7 The diagram shows a sectional view of a photovoltaic module along the second cross-sectional direction BB1. The first part 112 is located on the solder strip 102 of the third cell 1112 as the third solder strip 1023, and the insulating part 105 is located on the edge of the third cell 1112 away from the fourth cell 131 along the first direction X. The step of forming the busbar 104 may include: connecting the busbar 103 to the first side 122a of the second part 122.

[0100] In other examples, in conjunction with references Figure 14 and Figure 15 The first part 112 is located on the solder strip 102 of the third battery cell 1112 as the third solder strip 1023, and the insulating part 105 is located on the edge of the third battery cell 1112 away from the fourth battery cell 131 along the first direction X; the step of constituting the busbar 104 may include: connecting the busbar 103 to the second side 122b of the second part 122.

[0101] in, Figure 14 This is a second partial top view of the photovoltaic module in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure; Figure 15 for Figure 14 The diagram shows a sectional view of a photovoltaic module along the second cross-section direction BB1.

[0102] In yet another example, in conjunction with the reference Figure 16 and Figure 17 The first part 112 is located on the solder strip 102 of the third battery cell 1112 as the third solder strip 1023, and the insulating part 105 is located on the edge of the third battery cell 1112 along the first direction X near the fourth battery cell 131; the step of constituting the busbar 104 may include: connecting the busbar 103 to the first side 122a of the second part 122.

[0103] in, Figure 16 This is a third partial top view of the photovoltaic module in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure; Figure 17 for Figure 16 The diagram shows a sectional view of a photovoltaic module along the third cross-section direction CC1.

[0104] In some other examples, in conjunction with the reference Figure 18 and Figure 19The first part 112 is located on the solder strip 102 of the third battery cell 1112 as the third solder strip 1023, and the insulating part 105 is located on the edge of the third battery cell 1112 along the first direction X near the fourth battery cell 131; the step of constituting the busbar 104 may include: connecting the busbar 103 to the second side 122b of the second part 122.

[0105] in, Figure 18 This is a fourth partial top view of the photovoltaic module in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure; Figure 19 for Figure 18 The diagram shows a sectional view of a photovoltaic module along the third cross-section direction CC1.

[0106] In other cases, in conjunction with references Figure 7 , Figure 14 , Figure 16 , Figure 18 and Figures 20 to 23 A battery string 100 includes two first battery cells 111, one of which is a second battery cell 1111 located closer to another battery string 100 along the first direction X, and the other is a third battery cell 1112. Among the solder strips 102 electrically connecting adjacent second battery cells 1111, the solder strip 102 with its first portion 112 located on the second battery cell 1111 having an insulating portion 105 is called the first solder strip 1021, and the solder strip 102 with its first portion 112 located on the other second battery cell 1111 is called the second solder strip 1022. The first solder strip 1021 and the second solder strip 1022 are connected to the same busbar 103. The positional relationship between the second battery cell 1111, the insulating portion 105, the solder strip 102, and the busbar 103 will be described in detail below.

[0107] In some examples, in conjunction with references Figure 7 , Figure 20 and Figure 21 The steps of constituting the busbar 104 may include: connecting the busbar 103 to the first side 122a of the second portion 122 of both the first solder strip 1021 and the second solder strip 1022. In other words, a portion of the second portion 122 of both the first solder strip 1021 and the second solder strip 1022 is located on the side of the busbar 103 away from the insulating portion 105.

[0108] in, Figure 20 for Figure 7 The diagram shows another sectional view of the photovoltaic module along the first cross-section direction AA1. Figure 21 for Figure 9 The diagram shows a sectional view of a photovoltaic module along the fourth section direction EE1, with a bend. Figure 21 It can also be regarded as Figure 7The diagram shows a sectional view of a photovoltaic module along the fourth cross-section.

[0109] In other examples, in conjunction with references Figure 16 , Figure 21 and Figure 22 The steps of constituting the busbar 104 may include: connecting the busbar 103 to the second side 122b of the second portion 122 of the first solder strip 1021, and connecting the busbar 103 to the first side 122a of the second portion 122 of the second solder strip 1022. Thus, the portion of the second portion 122 of the first solder strip 1021, excluding the bend 1221, is located between the insulating portion 105 and the busbar 103, and a portion of the second portion 122 of the second solder strip 1022 is located on the side of the busbar 103 away from the insulating portion 105.

[0110] in, Figure 22 for Figure 16 The diagram shows a schematic cross-sectional view of a photovoltaic module along the first cross-sectional direction AA1. Furthermore, Figure 22 It can also be regarded as Figure 14 The diagram shows a sectional view of a photovoltaic module along the first cross-sectional direction AA1. Figure 21 It can also be regarded as Figure 14 or Figure 16 The diagram shows a sectional view of a photovoltaic module along the fourth cross-section.

[0111] In yet another example, in conjunction with the reference Figure 18 , Figure 22 and Figure 23 The steps of constituting the busbar 104 may include: connecting the busbar 103 to the second side 122b of the second portion 122 of both the first solder strip 1021 and the second solder strip 1022. In other words, a portion of the second portion 122 of both the first solder strip 1021 and the second solder strip 1022 is located between the busbar 103 and the insulating portion 105.

[0112] in, Figure 23 for Figure 9 The diagram shows another inflection section of the photovoltaic module along the fourth section direction EE1. Figure 21 It can also be regarded as Figure 18 The diagram shows a sectional view of a photovoltaic module along the fourth cross-section.

[0113] It should be noted that in the above three examples, the orthographic projections of the second part 122 of the first solder ribbon 1021 and the second part 122 of the second solder ribbon 1022 on the back contact cell 101 do not overlap. In other words, the second part 122 of the first solder ribbon 1021 and the second part 122 of the second solder ribbon 1022 are not directly opposite each other along the second direction Y.

[0114] In some embodiments, in conjunction with reference Figure 7 and Figure 24 or in conjunction with references Figure 14 and Figure 25 A battery string 100 includes two first battery pieces 111, one of which is a second battery piece 1111 located close to another battery string 100 along the first direction X, and the other is a third battery piece 1112; an insulating portion 105 is provided on one of the two adjacent second battery pieces 1111; in the solder strips 102 that electrically connect the two adjacent second battery pieces 1111, the solder strip 102 with the first part 112 located on the second battery piece 1111 provided with the insulating portion 105 is the first solder strip 1021, and the solder strip 102 with the first part 112 located on the other second battery piece 1111 is the second solder strip 1022. The first solder strip 1021 and the second solder strip 1022 are connected to the same busbar 103, and the second part 122 of the first solder strip 1021 is bent at a preset angle γ in the second direction Y.

[0115] Based on this, the busbar 103 is connected to the second part 122 of the first solder strip 1021 to form a busbar 104; after folding the busbar 104 to the side of the insulating part 105 away from the first cell 111, the method of manufacturing the photovoltaic module further includes: connecting the second part 122 of the second solder strip 1022 to the side of the busbar 103 away from the first cell 111.

[0116] Thus, the connection steps of the first solder strip 1021 and the busbar 103 and the second solder strip 1022 and the busbar 103 are performed separately. In the connection step of the first solder strip 1021 and the busbar 103, a bus section 104 is formed. After the bus section 104 is folded over, the connection step of the second solder strip 1022 and the busbar 103 is performed.

[0117] in, Figure 24 This is a schematic diagram of another partial cross-sectional structure of the busbar in a method for manufacturing a photovoltaic module according to an embodiment of the present disclosure; Figure 25 This is a schematic diagram of another partial cross-sectional structure of the busbar in a photovoltaic module manufacturing method provided in an embodiment of the present disclosure.

[0118] In some cases, in conjunction with references Figure 7 and Figure 24 The steps of constructing the busbar 104 may include: connecting the busbar 103 to the first side 122a of the second portion 122 of the first solder strip 1021; and after folding the busbar 104, connecting the first side 122a of the second portion 122 of the second solder strip 1022 to the busbar 103. Thus, portions of the second portions 122 of both the first solder strip 1021 and the second solder strip 1022 are located on the side of the busbar 103 away from the insulating portion 105.

[0119] In other cases, in conjunction with references Figure 14 and Figure 25 The steps of constructing the busbar 104 may include: connecting the busbar 103 to the second side 122b of the second portion 122 of the first solder strip 1021; and after folding the busbar 104, connecting the first side 122a of the second portion 122 of the second solder strip 1022 to the busbar 103. Thus, portions of the second portions 122 of both the first solder strip 1021 and the second solder strip 1022 are located on opposite sides of the busbar 103, wherein a portion of the second portion 122 of the first solder strip 1021 is located on the side of the busbar 103 closer to the insulating portion 105, and a portion of the second portion 122 of the second solder strip 1022 is located on the side of the busbar 103 away from the insulating portion 105.

[0120] In some embodiments, reference Figure 4 The insulating part 105 can be a separator, and the material of the separator can include insulating materials such as silicon nitride, silicon oxynitride, or encapsulating film.

[0121] In some embodiments, reference Figure 4 Each cell string 100 may also include at least one fourth cell 131 located between two first cells 111. The photovoltaic module also includes a connecting strip 20, which electrically connects the first cells 111 and the fourth cells 131, or electrically connects two adjacent fourth cells 131. It should be noted that the materials of the solder ribbon 102 and the connecting strip 20 may be the same or different.

[0122] In summary, on the one hand, in step S2, bending at least a portion of the second parts 122 towards the second direction Y at a predetermined angle γ causes the second parts 122 to bend above the back contact battery cell 101, providing ample operating space on both sides of the second parts 122 along the first direction X. Furthermore, in step S3, connecting the raised second parts 122 to the busbar 103 can be performed above the back contact battery cell 101, providing operators with sufficient operating space to achieve the connection between the second parts 122 and the busbar 103. This not only improves the ease of operation in the manufacturing method but also helps ensure a good connection quality between the second parts 122 and the busbar 103. On the other hand, in step S2, the second part 122 is also simultaneously tilted in the fourth direction. Therefore, after step S5, in the same solder strip 102, the extension directions of the first part 112 and the folded second part 122 included in the busbar 104 are different. Even if the extension directions of the second part 122 and the first part 112 form an angle β, this avoids the second part 122 and the first part 112 from stacking along the second direction Y, thereby reducing the overall thickness at the connection between the solder strip 102 and the busbar 103. This reduces the risk of microcracks or breakage at this point in the subsequent photovoltaic module under pressure, thus improving the manufacturing yield of the photovoltaic module. Furthermore, simultaneously performing the operation of bending the second part 122 at a preset angle γ and controlling the tilt of the second part 122 in step S2 further simplifies the manufacturing process of the photovoltaic module.

[0123] Another embodiment of this disclosure provides a photovoltaic module manufacturing apparatus for implementing the photovoltaic module manufacturing method provided in the foregoing embodiments. The photovoltaic module manufacturing apparatus provided in another embodiment of this disclosure will be described in detail below with reference to the accompanying drawings. It should be noted that parts that are the same as or corresponding to those in the foregoing embodiments can be referred to the corresponding descriptions in the foregoing embodiments, and will not be repeated hereafter.

[0124] refer to Figure 26 , Figure 26 This is a functional block diagram of a photovoltaic module manufacturing apparatus according to another embodiment of the present disclosure. The photovoltaic module manufacturing apparatus for implementing the photovoltaic module manufacturing method as described in any of the above claims may include: The delivery module 109 is used to provide battery strings and busbars. The battery string 100 includes a plurality of back-contact battery cells arranged along a first direction. The plurality of back-contact battery cells 101 include a first battery cell located at the end of the battery string 100 and a solder strip located on the first battery cell 111. The solder strip 102 includes a first part located on the first battery cell 111 and a second part connected to the busbar 103.

[0125] The bending module 119 is used to bend at least a portion of the second parts 122 towards a preset angle in a second direction, and to control the second parts 122 to tilt towards a fourth direction, where the second direction Y is the thickness direction of the back contact battery sheet 101, and the fourth direction is the direction that intersects with the second direction Y.

[0126] The connecting module 129 is used to connect the busbar 103 to the second part 122 after bending at a preset angle γ to form a busbar section. The fourth direction is the direction that intersects with the width direction of the busbar 103.

[0127] The module 139 is configured to provide an insulating portion at least at the end of the first part 112 that connects to the second part 122.

[0128] The folding module 149 is used to fold the busbar 104 to the side of the insulating part 105 away from the first battery cell 111, so that the extension direction of the second part 122 forms an angle with the extension direction of the first part 112.

[0129] Thus, the bending module 119 can simultaneously perform the operation of bending the second part 122 at a preset angle γ and the operation of controlling the tilt of the second part 122, which helps to simplify the manufacturing process of photovoltaic modules. Moreover, the bending module 119 can provide sufficient operating space for the subsequent connection module 129 to connect the second part 122 and the busbar 103, which not only helps to improve the convenience of operation in the manufacturing process, but also helps to ensure a good connection quality between the second part 122 and the busbar 103. Furthermore, the operation of the bending module 119 to control the tilt of the second part 122 provides a basis for forming an angle in the subsequent folding module 149, and ultimately promotes the formation of an angle β between the extension direction of the second part 122 and the first part 112, thereby effectively avoiding the stacking of the second part 122 and the first part 112 along the second direction Y, thereby reducing the overall thickness at the connection between the solder strip 102 and the busbar 103, thereby reducing the risk of microcracks or breakage in the photovoltaic module after pressure, and thus improving the manufacturing yield of the photovoltaic module.

[0130] It should be noted that, Figure 26 This is only a schematic diagram of the modules and does not impose any restrictions on the equipment and instruments included in each module. You can flexibly select and adjust them according to the actual application.

[0131] Another embodiment of this disclosure provides a photovoltaic module, formed by the manufacturing method of the photovoltaic module provided in the foregoing embodiments, or formed by the manufacturing apparatus of the photovoltaic module provided in the foregoing embodiments. It should be noted that the parts that are the same as or corresponding to those in the foregoing embodiments can be referred to the corresponding descriptions in the foregoing embodiments, and will not be repeated hereafter.

[0132] Reference Figure 6 and Figure 7The photovoltaic module may include: a battery string 100, the battery string 100 including a plurality of back-contact battery cells 101 arranged along a first direction X, the plurality of back-contact battery cells 101 including a first battery cell 111 located at the end of the battery string 100 and a solder strip 102 located on the first battery cell 111; wherein, the solder strip 102 includes a first portion 112 located on the first battery cell 111, and a second portion 122 connected to the first portion 112 and having a portion located on the side of the first portion 112 away from the first battery cell 111, and the second portion 122 is inclined in a direction deviating from the extending direction of the first portion 112; an insulating portion 105, at least covering the end of the first portion 112 connected to the second portion 122; and a busbar 103 connected to the second portion 122, located on the side of the insulating portion 105 away from the first battery cell 111.

[0133] It is worth noting that the second part 122 is inclined in a direction that deviates from the extension direction of the first part 112. Without considering the connection between the second part 122 and the first part 112, the second part 122 and the first part 112 are not directly opposite each other along the second direction Y. In other words, the orthographic projections of the second part 122 and the first part 112 on the back contact cell 101 of the same solder ribbon 102 do not overlap. This effectively avoids the second part 122 and the first part 112 stacking along the second direction Y, thereby reducing the overall thickness at the connection between the solder ribbon 102 and the busbar 103. This reduces the risk of microcracks or cell breakage under pressure in subsequent photovoltaic modules, thus improving the manufacturing yield of the photovoltaic modules. Furthermore, since the insulating part 105 is located on the back contact cell 101, the busbar 103 located on the side of the insulating part 105 away from the first cell 111 is also located on the back contact cell 101, allowing adjacent back contact cells 101 to be arranged without gaps, which helps to reduce the overall size of the photovoltaic module. The extension direction that deviates from the first part 112 can be referred to by the aforementioned first tilt direction K1 and second tilt direction K2.

[0134] In some embodiments, reference Figure 7 Each cell string 100 may also include at least one fourth cell 131 located between two first cells 111. The photovoltaic module also includes a connecting strip 20, which electrically connects the first cells 111 and the fourth cells 131, or electrically connects two adjacent fourth cells 131. It should be noted that the materials of the solder ribbon 102 and the connecting strip 20 may be the same or different.

[0135] Based on this, the insulating part 105 also covers at least the end of the connecting strip 20 to achieve electrical insulation between the busbar 103 and the connecting strip 20.

[0136] In some cases, the insulating part 105 can be a long strip structure extending in the third direction Z, covering both the end of the first part 112 that connects to the second part 122 and the end of the connecting strip 20.

[0137] In some embodiments, in conjunction with reference Figure 5 and Figure 9 When the angle β formed by the extension directions of the second part 122 and the first part 112 is an acute angle, the size of the acute angle can be 5° to 85°. Therefore, designing the acute angle formed by the extension directions of the second part 122 and the first part 112 to be 5° to 85° helps to prevent the second part 122 and the first part 112 from stacking along the second direction Y, further ensuring that the connection between the first part 112 and the second part 122 does not stack along the second direction Y, and avoiding excessive tilt of the second part 122 relative to the first part 112, thus reducing the risk of breakage at the connection between the second part 122 and the first part 112.

[0138] In some embodiments, in conjunction with reference Figures 7 to 9 A battery string 100 may include two first battery pieces 111, one of which is a second battery piece 1111 located close to another battery string 100 along a first direction X, and the other is a third battery piece 1112; an insulating portion 105 is located on one of the two adjacent second battery pieces 1111; in the solder strips 102 that electrically connect the two adjacent second battery pieces 1111, the solder strip 102 with the first portion 112 located on the second battery piece 1111 provided with the insulating portion 105 is the first solder strip 1021, and the solder strip 102 with the first portion 112 located on the other second battery piece 1111 is the second solder strip 1022, and the first solder strip 1021 and the second solder strip 1022 are connected to the same busbar 103; the tilt direction of the second portion 122 of the first solder strip 1021 is different from the tilt direction of the second portion 122 of the second solder strip 1022.

[0139] The tilt direction of the second part 122 of the first solder strip 1021 can be defined as the first tilt direction K1, and the tilt direction of the second part 122 of the second solder strip 1022 can be defined as the second tilt direction K2. By designing the first tilt direction K1 and the second tilt direction K2 to be different, the second part 122 of the first solder strip 1021 and the second part 122 of the second solder strip 1022 connected to the same busbar 103 will be connected to different areas on the busbar 103. This effectively avoids the second part 122 of the first solder strip 1021 and the second part 122 of the second solder strip 1022 stacking along the second direction Y, thereby further reducing the risk of microcracks or breakage during the manufacturing process of photovoltaic modules.

[0140] In some cases, the angle β formed by the extension direction of the second part 122 of the first solder strip 1021 and the first part 112 is a first acute angle β1, and the angle β formed by the extension direction of the second part 122 of the second solder strip 1022 and the first part 112 is a second acute angle β2. The first acute angle β1 may be smaller than the second acute angle β2.

[0141] It is worth noting that, compared to the first solder ribbon 1021 where the second portion 122 is almost folded approximately 180° relative to the first portion 112, the second portion 122 of the second solder ribbon 1022 requires almost no significant folding; it simply overlaps the insulating portion 105 on the side away from the first solar cell 111. In other words, compared to the degree of curvature at the connection between the second portion 122 and the first portion 112 of the first solder ribbon 1021, the degree of curvature at the connection between the second portion 122 and the first portion 112 of the second solder ribbon 1022 is smaller. Furthermore, by designing the first acute angle β1 to be smaller than the second acute angle β2, the degree of curvature at the connection between the second portion 122 and the first portion 112 of the second solder ribbon 1022 is greater than the degree of inclination of the second portion 122 relative to the first portion 112 of the first solder ribbon 1021.

[0142] In particular, an increase in the degree of bending at the connection between the second part 122 and the first part 112, or an increase in the degree of inclination of the second part 122 relative to the first part 112, tends to result in greater bending internal stress at the connection between the second part 122 and the first part 112. Therefore, the bending internal stress at the connection between the second part 122 and the first part 112 of the first solder strip 1021 is defined as the first stress, and the bending internal stress at the connection between the second part 122 and the first part 112 of the second solder strip 1022 is defined as the second stress. The difference between the first stress and the second stress is used as a reference value. Designing the first acute angle β1 to be smaller than the second acute angle β2 helps to reduce the difference between the first stress and the second stress, that is, to reduce the reference value, thereby balancing the bending internal stress on the first solder strip 1021 and the second solder strip 1022, so as to improve the manufacturing yield of photovoltaic modules.

[0143] In some examples, the size of the first acute angle β1 can be 5°~45°, for example, it can be 5°~10°, 10°~15°, 15°~20°, 20°~25°, 25°~30°, 30°~35°, 35°~40° or 40°~45°. In this way, while ensuring that the connection between the first part 112 and the second part 122 does not overlap along the second direction Y, the tilt of the second part 122 of the first solder strip 1021 relative to the first part 112 is reduced, and the bending internal stress at the connection between the second part 122 of the first solder strip 1021 and the first part 112 is reduced.

[0144] Optionally, the size of the first acute angle β1 can be 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°, 16°, 17°, 18°, 19°, 20°, 21°, 22°, 23°, 24°, 25°, 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°, 35°, 36°, 37°, 38°, 39°, 40°, 41°, 42°, 43°, 44°, or 45°, etc.

[0145] The size of the second acute angle β2 can be 30°~85°, for example, it can be 30°~35°, 35°~40°, 40°~45°, 45°~50°, 50°~55°, 55°~60°, 60°~65°, 65°~70°, 70°~75°, 75°~80° or 80°~85°. Optionally, the size of the first acute angle β1 can be 30°, 31°, 32°, 33°, 34°, 35°, 36°, 37°, 38°, 39°, 40°, 41°, 42°, 43°, 44°, 45°, 46°, 47°, 48°, 49°, 50°, 51°, 52°, 53°, 54°, 55°, 56°, 57°, 58°, 59°, 60°, 61°, 62°, 63°, 64°, 65°, 66°, 67°, 68°, 69°, 70°, 71°, 72°, 73°, 74°, 75°, 76°, 77°, 78°, 79°, 80°, 81°, 82°, 83°, 84°, or 85°, etc. In this way, the tilt of the second part 122 of the second weld strip 1022 relative to the first part 112 is avoided to be too large. While ensuring that the first acute angle β1 is smaller than the second acute angle β2, the bending internal stress at the connection between the second part 122 and the first part 112 of the second weld strip 1022 is reduced as much as possible.

[0146] In some embodiments, in conjunction with reference Figure 7 and Figure 11 Multiple solder strips 102 can be spaced apart on the first solar cell 111 along a third direction Z, where Z intersects with the first direction X. Multiple spaced slots 123 are provided in the busbar 103, and the second part 122 is located in one of the slots 123. Thus, by limiting the second part 122 based on the slots 123, the angle β formed by the extension direction of the second part 122 and the first part 112 is ensured to be within a preset range, reducing the risk of the second part 122 detaching from the busbar 103, thereby improving the structural stability of the photovoltaic module.

[0147] In some cases, refer to Figure 7 A single cell string 100 may further include at least one fourth cell 131 located between two first cells 111. The photovoltaic module also includes a connecting strip 20, which electrically connects the first cells 111 and the fourth cells 131, or electrically connects two adjacent fourth cells 131. Furthermore, multiple connecting strips 20 may be spaced apart on the fourth cells 131 along a third direction Z. Moreover, on the fourth cells 131, a connecting strip 20 is spaced between two adjacent solder strips 102, and a solder strip 102 is spaced between two adjacent connecting strips 20. The connecting strips 20 and solder strips 102 are used to collect charge carriers of different conductivity types in the fourth cells 131.

[0148] In some cases, in conjunction with references Figure 7 and Figure 11 Along the second direction Y, the depth of the slot 123 can be less than or equal to the thickness of the solder strip 102. In other words, the second part 122 of the solder strip 102 may not completely fill the slot 123, which helps to reduce the thickness difference between the part of the busbar 103 where the second part 122 is provided and the part where the second part 122 is not provided, thereby improving the structural strength of the busbar 103 itself and balancing the carrier transmission capacity of each region of the busbar 103.

[0149] In some examples, the thickness of the solder strip 102 can be 0.04 mm to 0.16 mm, for example, 0.04 mm to 0.1 mm or 0.1 mm to 0.16 mm. Optionally, the thickness of the solder strip 102 can be 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm or 0.16 mm.

[0150] The thickness of the bottom of the busbar 103 forming the slot 123 can be 0.09mm to 0.21mm, for example, 0.09mm to 0.15mm or 0.15mm to 0.21mm. Optionally, the thickness of the solder strip 102 can be 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm or 0.21mm.

[0151] In some embodiments, reference Figure 12 In the second part 122, a local area connecting to the first part 112 constitutes a bent part 1221, which forms a bending angle α. The bending angle α can be no higher than 60°, for example, it can be 50°~60°, 40°~50°, or 30°~40°. This effectively prevents the bent part 1221 from arching away from the back contact cell 101, thus preventing it from intruding into the back adhesive film 107 and further preventing it from contacting the back glass 108. This reduces the risk of the back glass 108 breaking and improves the structural stability of the photovoltaic module.

[0152] Optionally, the bending angle α can be 60°, 59°, 58°, 57°, 56°, 55°, 54°, 53°, 52°, 51°, 50°, 49°, 48°, 47°, 46°, 45°, 44°, 43°, 42°, 41°, 40°, 39°, 38°, 37°, 36°, 35°, 34°, 33°, 32°, 31°, or 30°, etc.

[0153] It should be noted that, based on the irregular shape of the bent portion 1221, refer to... Figure 27 or Figure 28 The method for measuring the bending angle α can be as follows: Taking the vertex of the bending portion 1221 furthest from the busbar 103 as the reference point O, along the first direction X, take one point on each side of the bending portion 1221 at a preset distance D5 from the reference point O; wherein, the point on the upper side of the bending portion 1221 at a preset distance D5 from the reference point O is the first measurement point R1, and the point on the lower side of the bending portion 1221 at a preset distance D5 from the reference point O is the second measurement point R2. In some examples, refer to Figure 27 The angle formed by the tangent direction of the arc surface where the first measurement point R1 is located and the tangent direction of the arc surface where the second measurement point R2 is located is taken as the bending angle α; or, in other examples, refer to Figure 28 The angle formed by the line connecting the first measurement point R1 and the reference point O and the line connecting the second measurement point R2 and the reference point O is taken as the bending angle α.

[0154] in, Figure 27 A cross-sectional structural diagram of a bent portion in a photovoltaic module provided in yet another embodiment of this disclosure; Figure 28 This is a schematic diagram of another cross-sectional structure of the bent portion in a photovoltaic module according to yet another embodiment of this disclosure. Furthermore, to clearly illustrate the reference point O, the first measurement point R1, and the second measurement point R2, Figure 27 and Figure 28 The reference point O, the first measurement point R1, and the second measurement point R2 are indicated by small red dots. Figure 27 The red dashed lines in the diagram indicate the tangent directions of the arc surface where the first measurement point R1 is located and the arc surface where the second measurement point R2 is located. Figure 28 The line connecting the first measurement point R1 and the reference point O, as well as the line connecting the second measurement point R2 and the reference point O, are indicated by red dashed lines.

[0155] In some examples, reference Figure 27 or Figure 28The preset distance D5 can be 2mm~3mm, for example, 2mm~2.5mm or 2.5mm~3mm. Optionally, the preset distance D5 can be 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm or 3mm, etc.

[0156] In some cases, refer to Figure 12 and Figure 28 Along the first direction X, the distance D4 between the vertex of the bend 1221 away from the busbar 103, i.e., the reference point O, and the end face of the busbar 103 near the bend 1221 can be 0mm~10mm, for example, 0mm~2mm, 2mm~4mm, 4mm~6mm, 6mm~8mm, or 8mm~10mm. Optionally, the distance D4 between the vertex of the bend 1221 away from the busbar 103 and the end face of the busbar 103 near the bend can be 0mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, or 10mm, etc.

[0157] In some examples, the distance D4 between the vertex of the bend 1221 away from the busbar 103 and the end face of the busbar 103 near the bend is 0 mm, then the vertex of the bend 1221 away from the busbar 103 abuts against the end face of the busbar 103 near the bend.

[0158] In some embodiments, reference Figure 12 The photovoltaic module may further include a spacer strip 106, located at least on the side of the bend 1221 away from the first solar cell 111. Thus, by utilizing the cushioning effect of the spacer strip 106, the pressure exerted by the bend 1221 on the back adhesive film 107 is reduced, and the bend 1221 is effectively prevented from intruding into the back adhesive film 107, thereby preventing the thickness of the back adhesive film 107 at the junction of the first part 112 and the second part 122 from thinning, thereby improving the structural stability of the photovoltaic module.

[0159] In some cases, the material of the gasket 106 may include an adhesive film, and the basis weight of the gasket 106 may be 300 g / m². 2 ~600g / m 2 For example, it can be 300g / m 2 ~400g / m 2 400g / m 2 ~500g / m 2 Or 500g / m 2 ~600g / m 2Optionally, the weight of the 106 pad can be 300 g / m². 2 310g / m 2 320g / m 2 330g / m 2 340g / m 2 350g / m 2 360g / m 2 370g / m 2 380g / m 2 390g / m 2 400g / m 2 410g / m 2 420g / m 2 430g / m 2 440g / m 2 450g / m 2 460g / m 2 470g / m 2 480g / m 2 490g / m 2 500g / m 2 510g / m 2 520g / m 2 530g / m 2 540g / m 2 550g / m 2 560g / m 2 570g / m 2 580g / m 2 590g / m 2 Or 600g / m 2 wait.

[0160] In some embodiments, reference Figure 7 The busbar 103 is located between at least a portion of the second part 122 and the insulating part 105.

[0161] In some cases, refer to Figure 7 and Figure 13 or in conjunction with references Figure 16 and Figure 17 A battery string 100 includes two first battery pieces 111, one of which is a second battery piece 1111 located close to another battery string 100 along the first direction X, and the other is a third battery piece 1112; a single battery string 100 may also include at least one fourth battery piece 131 located between the two first battery pieces 111, that is, between the second battery piece 1111 and the third battery piece 1112.

[0162] In some examples, in conjunction with references Figure 7and Figure 13 The first part 112 is located on the solder strip 102 of the third battery cell 1112 as the third solder strip 1023, the insulating part 105 is located on the edge of the third battery cell 1112 away from the fourth battery cell 131 along the first direction X, and the bus bar 103 is located between the second part 122 of the third solder strip 1023 and the insulating part 105.

[0163] In other examples, in conjunction with references Figure 16 and Figure 17 The first part 112 is located on the solder strip 102 of the third battery cell 1112 as the third solder strip 1023, the insulating part 105 is located on the edge of the third battery cell 1112 near the fourth battery cell 131 along the first direction X, and the bus bar 103 is located between the second part 122 of the third solder strip 1023 and the insulating part 105.

[0164] In other cases, in conjunction with references Figure 7 , Figure 20 and Figure 21 A battery string 100 includes two first battery cells 111, one of which is a second battery cell 1111 located close to another battery string 100 along the first direction X, and the other is a third battery cell 1112; among the solder strips 102 that electrically connect two adjacent second battery cells 1111, the solder strip 102 with the first part 112 located on the second battery cell 1111 provided with the insulating part 105 is the first solder strip 1021, and the solder strip 102 with the first part 112 located on the other second battery cell 1111 is the second solder strip 1022. The first solder strip 1021 and the second solder strip 1022 are connected to the same busbar 103.

[0165] In some examples, in conjunction with references Figure 7 , Figure 20 and Figure 21 The busbar 103 is located between the second part 122 of the first solder strip 1021 and the second solder strip 1022 and the insulating part 105, and the orthogonal projections of the second part 122 of the first solder strip 1021 and the second solder strip 1022 on the back contact cell 101 do not coincide.

[0166] In other embodiments, reference is made to... Figure 14 The busbar 103 is located on the side of at least a portion of the second part 122 away from the insulating part 105.

[0167] In some cases, refer to Figure 14 and Figure 15 or in conjunction with references Figure 18 and Figure 19A battery string 100 includes two first battery pieces 111, one of which is a second battery piece 1111 located close to another battery string 100 along the first direction X, and the other is a third battery piece 1112; a single battery string 100 may also include at least one fourth battery piece 131 located between the two first battery pieces 111, that is, between the second battery piece 1111 and the third battery piece 1112.

[0168] In some examples, in conjunction with references Figure 14 and Figure 15 The first part 112 is located on the solder strip 102 of the third battery cell 1112 as the third solder strip 1023, the insulating part 105 is located on the edge of the third battery cell 1112 away from the fourth battery cell 131 along the first direction X, and the bus bar 103 is located on the side of the second part 122 of the third solder strip 1023 away from the insulating part 105.

[0169] In other examples, in conjunction with references Figure 18 and Figure 19 The first part 112 is located on the solder strip 102 of the third battery cell 1112 as the third solder strip 1023, the insulating part 105 is located on the edge of the third battery cell 1112 along the first direction X near the fourth battery cell 131, and the bus bar 103 is located on the side of the second part 122 of the third solder strip 1023 away from the insulating part 105.

[0170] In other cases, in conjunction with references Figure 18 , Figure 22 and Figure 23 A battery string 100 includes two first battery cells 111, one of which is a second battery cell 1111 located close to another battery string 100 along the first direction X, and the other is a third battery cell 1112; among the solder strips 102 that electrically connect two adjacent second battery cells 1111, the solder strip 102 with the first part 112 located on the second battery cell 1111 provided with the insulating part 105 is the first solder strip 1021, and the solder strip 102 with the first part 112 located on the other second battery cell 1111 is the second solder strip 1022. The first solder strip 1021 and the second solder strip 1022 are connected to the same busbar 103.

[0171] In some examples, in conjunction with references Figure 18 , Figure 22 and Figure 23 The busbar 103 is located on the side of the second part 122 of both the first solder strip 1021 and the second solder strip 1022 away from the insulating part 105, and the orthogonal projections of the second part 122 of both the first solder strip 1021 and the second solder strip 1022 on the back contact cell 101 do not coincide.

[0172] In yet other embodiments, in conjunction with reference to the reference Figure 16 , Figure 21 and Figure 22 The busbar 103 is located between a portion of the second portion 122 and the insulating portion 105, and on the side of the other portion of the second portion 122 away from the insulating portion 105.

[0173] In some cases, refer to Figure 16 , Figure 21 and Figure 22 A battery string 100 includes two first battery cells 111, one of which is a second battery cell 1111 located close to another battery string 100 along the first direction X, and the other is a third battery cell 1112; among the solder strips 102 that electrically connect two adjacent second battery cells 1111, the solder strip 102 with the first part 112 located on the second battery cell 1111 provided with the insulating part 105 is the first solder strip 1021, and the solder strip 102 with the first part 112 located on the other second battery cell 1111 is the second solder strip 1022. The first solder strip 1021 and the second solder strip 1022 are connected to the same busbar 103.

[0174] Based on this, the busbar 103 is located between the second portion 122 of the first solder strip 1021 and the insulating portion 105, and on the side of the second portion 122 of the second solder strip 1022 away from the insulating portion 105. In other words, the second portions 122 of both the first solder strip 1021 and the second solder strip 1022 are located on opposite sides of the busbar 103. Moreover, the orthographic projections of the second portions 122 of both the first solder strip 1021 and the second solder strip 1022 onto the back contact cell 101 do not coincide.

[0175] In some embodiments, reference Figure 29 , Figure 29 This is a partial top view of a photovoltaic module provided in another embodiment of the present disclosure. The battery string 100 has two opposite edges 110 along a first direction X. The first battery cell 111 may also include an edge solder joint 121. The solder strip 102 is connected to the edge solder joint 121 and is located on the side of the edge solder joint 121 away from the first battery cell 111.

[0176] In some cases, along the first direction X, the distance between the edge solder joint 121 and the edge 110 is a first distance D1, and the distance between the busbar 103 and the edge 110 is a second distance D2, where the second distance D2 can be greater than the first distance D1. Thus, along the second direction Y, this helps to stagger the edge solder joint 121 and the busbar 103, preventing the busbar 103 from stacking on the edge solder joint 121. This reduces the overall thickness at the connection between the solder strip 102 and the busbar 103, thereby reducing the risk of microcracks or breakage under pressure in the photovoltaic module, and ultimately improving the structural stability of the photovoltaic module.

[0177] In some examples, the second distance D2 can be greater than 10 mm, for example, it can be greater than 10 mm and less than 11 mm, 11 mm to 12 mm, or 12 mm to 13 mm, etc. Optionally, the second distance D2 can be 10.5 mm, 11 mm, 11.5 mm, 12 mm, 12.5 mm, or 13 mm, etc.

[0178] The first distance D1 can be 5mm to 10mm, for example, it can be 5mm to 6mm, 6mm to 7mm, 7mm to 8mm, 8mm to 9mm, or 9mm to 10mm, etc. Optionally, the first distance D1 can be 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, or 10mm, etc.

[0179] In some cases, refer to Figure 29 The photovoltaic module may also include: adhesive dots 159 connecting the first part 112 and the first solar cell 111. The distance between the adhesive dots 159 and the edge 110 is a third distance D3, and the first distance D1 may be greater than the third distance D3. Thus, along the first direction X, the adhesive dots 159 are designed to be closer to the edge 110 than the edge solder joints 121. While fixing the end of the first part 112 connected to the second part 122 with the adhesive dots 159, the busbars 103 are further prevented from stacking on the adhesive dots 159, thereby reducing the overall thickness at the connection between the solder strips 102 and the busbars 103. This reduces the risk of microcracks or cell breakage under pressure in the photovoltaic module, thereby improving the structural stability of the photovoltaic module.

[0180] In some embodiments, reference Figure 12 The photovoltaic module may also include: a back film 107 and a back glass 108; the back film 107 is located on the side of the back contact cell 101 having a busbar 103, and the back film 107 covers the busbar 103, the solder ribbon 102 and the insulation portion 105; the back glass 108 is located on the side of the back film 107 away from the back contact cell 101.

[0181] In some cases, the basis weight of the backing film 107 can be 400 g / m². 2 ~500g / m 2 For example, it can be 400g / m 2 ~450g / m 2 Or 450g / m 2 ~500g / m 2 Optionally, the backing film 107 can have a weight of 400g / m². 2 410g / m 2 420g / m 2 430g / m 2 440g / m2 450g / m 2 460g / m 2 470g / m 2 480g / m 2 490g / m 2 Or 500g / m 2 .

[0182] In some embodiments, reference Figure 12 The photovoltaic module may also include: a front encapsulating film 117 and a front glass 118; the front encapsulating film 117 is located on the side of the back contact cell 101 where the busbar 103 is not provided; the front glass 118 is located on the side of the front encapsulating film 117 away from the back contact cell 101.

[0183] In some cases, the basis weight of the front adhesive film 117 can be 340 g / m². 2 ~380g / m 2 For example, it can be 340g / m 2 ~360g / m 2 Or 360g / m 2 ~380g / m 2 Optionally, the backing film 107 can have a weight of 340 g / m². 2 345g / m 2 350g / m 2 355g / m 2 360g / m 2 365g / m 2 370g / m 2 375g / m 2 Or 380g / m 2 .

[0184] It is worth noting that in the back contact cell 101, the solder ribbon 102 is only set on the back side and not on the front side. Therefore, the weight of the front adhesive film 117 corresponding to the front side can be designed to be smaller than that of the back adhesive film 107. This can ensure the sealing effect of the photovoltaic module, reduce the amount of adhesive film used, and reduce the overall weight and thickness of the photovoltaic module, thereby improving the portability of the photovoltaic module.

[0185] In addition, the pad strip 106 is used to buffer the pressure of the bending part 1221 on the back adhesive film 107. Therefore, depending on the specific requirements, when the material of the pad strip 106 includes the adhesive film, the basis weight of the pad strip 106 can be less than or equal to the basis weight of the front adhesive film 117, or it can be greater than the basis weight of the front adhesive film 117 and less than the basis weight of the back adhesive film 107, or it can be greater than the basis weight of the back adhesive film 107.

[0186] In some embodiments, reference Figure 12Along the second direction Y, the thickness of the insulating portion 105 can be 0.1mm to 0.5mm, for example, it can be 0.1mm to 0.2mm, 0.2mm to 0.3mm, 0.3mm to 0.4mm, or 0.4mm to 0.5mm. Optionally, the thickness of the insulating portion 105 can be 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, or 0.29mm. m, 0.3mm, 0.3mm, 0.31mm, 0.32mm, 0.33mm, 0.34mm, 0.35mm, 0.36mm, 0.37mm, 0.38mm, 0.39mm , 0.4mm, 0.41mm, 0.42mm, 0.43mm, 0.44mm, 0.45mm, 0.46mm, 0.47mm, 0.48mm, 0.49mm or 0.5mm, etc.

[0187] In some embodiments, reference Figure 12 Along the second direction Y, the thickness of the back contact cell 101 excluding the solder ribbon 102 is 0.13 mm, the thickness of the solder ribbon 102 is 0.04 mm to 0.16 mm, the thickness of the insulating portion 105 can be 0.1 mm to 0.5 mm, and the thickness of the bottom of the busbar 103 forming the slot 123, or the thickness of the busbar 103 without the slot 123, can be 0.09 mm to 0.21 mm. Based on this, the thickness of both the front adhesive film 117 and the back adhesive film 107 is designed to be greater than 0.18 mm, which helps to ensure that the front adhesive film 117 and the back adhesive film 107 have sufficient thickness to avoid hard contact between the back contact cell 101 and the front glass 118 and the back glass 108. In addition, to optimize the overall thickness of the photovoltaic module, it is more appropriate to design the thickness between the front glass 118 and the back glass 108 to be between 1.2mm and 1.8mm. Based on this, the thickness of the solder strip 102 is taken as the minimum value of 0.04mm, the thickness of the insulation part 105 is taken as the minimum value of 0.1mm, the thickness of the busbar is taken as the minimum value of 0.09mm, and the maximum sum of the thicknesses of the front encapsulant film 117 and the back encapsulant film 107 can be 1.4mm, that is, 1.8mm-0.13mm-2*0.04mm-0.1mm-0.09mm.

[0188] In some embodiments, reference Figure 2The back contact cell 101 includes, but is not limited to, IBC (Interdigitated Back Contact), HBC (Heterojunction Back Contact), TBC (TOPCon Back Contact), HTBC (Heterojunction Tunnel Oxide Passivated Back Contact), or HPBC (Hybrid Passivated Back Contact).

[0189] In some embodiments, reference Figure 6 The back contact solar cells 101 are electrically connected in the form of a whole cell or multiple segments to form multiple battery strings 100, and the multiple battery strings 100 are electrically connected in series and / or parallel. The back contact solar cells 101 can be a whole cell or a sliced ​​cell. A sliced ​​cell refers to a cell formed by cutting a complete whole cell.

[0190] In some embodiments, reference Figure 12 At least one of the front adhesive film 117, the back adhesive film 107, and the spacer strip 106 can be an organic encapsulation film such as polyvinyl butyral (PVB), ethylene-vinyl acetate copolymer (EVA), polyolefin thermoplastic elastomer (POE), or polyethylene glycol terephthalate (PET); or, at least one of the front adhesive film 117, the back adhesive film 107, and the spacer strip 106 can also be an EP film, an EPE film, or a PVP film. Specifically, an EP film refers to a co-extruded film composed of stacked EVA and POE films; an EPE film refers to a co-extruded film formed by sequentially stacking EVA, POE, and EVA films; and a PVP film refers to a co-extruded film formed by stacking POE, EVA, and POE films. Co-extruded films can be prepared by sequentially extruding one or more raw materials onto another pre-made film during the film processing, or by bonding different types of pre-made films together.

[0191] In some cases, refer to Figure 12Before lamination, the front encapsulant film 117 and the back encapsulant film 107 have a dividing line. After lamination, the front encapsulant film 117 and the back encapsulant film 107 have formed an integral encapsulation film in the final photovoltaic module.

[0192] In some embodiments, reference Figure 12 At least one of the front glass 118 and the back glass 108 can be a cover plate with light transmission function, such as a glass cover plate or a plastic cover plate.

[0193] In some cases, the surface of the front glass 118 facing the front film 117 can be an uneven surface or a textured surface containing multiple raised structures, thereby increasing the utilization rate of incident light.

[0194] In some cases, the surface of the back glass 108 facing the back adhesive film 107 can be an uneven surface or a textured surface containing multiple raised structures, thereby causing more light to be reflected again into the back contact cell 101.

[0195] Those skilled in the art will understand that the above embodiments are specific examples of implementing this disclosure, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the embodiments of this disclosure. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the embodiments of this disclosure; therefore, the scope of protection of the embodiments of this disclosure should be determined by the scope defined in the claims.

Claims

1. A method for manufacturing a photovoltaic module, characterized in that, include: A battery string is provided, the battery string including a plurality of back contact battery cells arranged along a first direction, the plurality of back contact battery cells including a first battery cell located at an end of the battery string and a solder strip located on the first battery cell, the solder strip including a first portion located on the first battery cell and a second portion connected to the first portion; At least a portion of the second part is bent at a predetermined angle in a second direction, and the second part is controlled to tilt in a direction deviating from the extension direction of the first part, wherein the second direction is the thickness direction of the back contact battery sheet; A busbar is provided, and the busbar is connected to the second part after being bent at the preset angle to form a busbar section; An insulating portion is provided at least at the end of the first part that connects to the second part; The current-collecting part is folded to the side of the insulating part away from the first battery cell, so that the second part forms an angle with the extending direction of the first part. The local area of ​​the second part that connects to the first part constitutes a bent part, and the bent part forms a bending angle. At least the connection between the first and second parts is pressurized to reduce the size of the bending angle.

2. The method for manufacturing a photovoltaic module according to claim 1, characterized in that, One of the two first battery cells in one of the battery strings is a second battery cell that is close to another battery string along the first direction, and the other is a third battery cell; The insulating portion is provided on one of two adjacent second battery cells; In the solder strips that electrically connect two adjacent second battery cells, the solder strip with the first part located on the second battery cell provided with the insulating part is the first solder strip, and the solder strip with the first part located on another second battery cell is the second solder strip. The first solder strip and the second solder strip are connected to the same busbar. In the step of bending at least a portion of the second portion toward the second direction by a preset angle, the preset angle of bending the second portion of the first solder strip is greater than or equal to 90°, and the preset angle of bending the second portion of the second solder strip is less than or equal to 90°; and / or, in the step of controlling the second portion to tilt toward the fourth direction, the tilting direction of the second portion of the first solder strip is different from the tilting direction of the second portion of the second solder strip.

3. The method for manufacturing a photovoltaic module according to claim 2, characterized in that, After the busbar is folded to the side of the insulating part away from the first battery cell, the angle formed by the second part of the first solder strip and the extension direction of the first part is a first acute angle, and the angle formed by the second part of the second solder strip and the extension direction of the first part is a second acute angle, and the first acute angle is smaller than the second acute angle.

4. The method for manufacturing a photovoltaic module according to any one of claims 1 to 3, characterized in that, Multiple welding strips are spaced apart on the first battery cell along a third direction, wherein the third direction is the direction intersecting the first direction; One of the busbars is connected to a plurality of second parts that have been bent at the preset angle to form the busbar; The step of providing the busbar includes: providing an initial busbar, wherein a plurality of spaced slots are provided in the initial busbar to form the busbar; During the process of connecting the busbar to the second part after bending at the preset angle, the second part is placed in the slot.

5. The method for manufacturing a photovoltaic module according to any one of claims 1 to 3, characterized in that, After the busbar is folded to the side of the insulating part away from the first battery cell, the local area in the second part that connects to the first part forms a bent part; The method for manufacturing the photovoltaic module further includes: providing a pad strip at least on the side of the bent portion away from the first solar cell; A back adhesive film and a back glass are provided on the surface formed by the pad strip, the welding strip and the first battery cell; The photovoltaic module is formed by lamination.

6. The method for manufacturing a photovoltaic module according to any one of claims 1 to 3, characterized in that, The second part has a first side close to the insulating part and a second side opposite to the first side; the steps of constituting the busbar include: connecting the busbar to the first side, or connecting the busbar to the second side.

7. The method for manufacturing a photovoltaic module according to claim 1, characterized in that, One of the two first battery cells in one of the battery strings is a second battery cell that is close to another battery string along the first direction, and the other is a third battery cell; The insulating portion is provided on one of two adjacent second battery cells; In the solder strips that electrically connect two adjacent second battery cells, the solder strip with the first part located on the second battery cell provided with the insulating part is the first solder strip, and the solder strip with the first part located on another second battery cell is the second solder strip. The first solder strip and the second solder strip are connected to the same busbar, and the second part of the first solder strip is bent at the preset angle in the second direction. The busbar is connected to the second part of the first solder strip to form the bus section; After folding the busbar to the side of the insulating portion away from the first solar cell, the method of manufacturing the photovoltaic module further includes: connecting the second portion of the second solder strip to the side of the busbar away from the first solar cell.

8. The method for manufacturing a photovoltaic module according to claim 1, characterized in that, The preset angle is 30°~150°; and / or, when the angle formed by the extension direction of the second part and the first part is an acute angle, the size of the acute angle is 5°~85°.

9. A photovoltaic module manufacturing apparatus for implementing the photovoltaic module manufacturing method as described in any one of claims 1 to 8, characterized in that, include: A delivery module is used to provide a battery string and a busbar, the battery string including a plurality of back-contact battery cells arranged along a first direction, the plurality of back-contact battery cells including a first battery cell located at the end of the battery string and a solder strip located on the first battery cell; the solder strip includes a first portion located on the first battery cell and a second portion connected to the busbar; A bending module is used to bend at least a portion of the second part towards a preset angle in a second direction, and to control the second part to tilt towards a fourth direction, wherein the second direction is the thickness direction of the back contact battery sheet, and the fourth direction is the direction intersecting with the second direction; A connecting module is used to connect the busbar to the second part after it is bent at the preset angle to form a busbar, wherein the fourth direction is the direction that intersects with the width direction of the busbar; A module is provided for providing an insulating portion at least at the end of the first part that connects to the second part; A folding module is used to fold the busbar to the side of the insulating part away from the first battery cell, so that the extension direction of the second part forms an angle with that of the first part.

10. A photovoltaic module, characterized in that, include: A battery string, the battery string including a plurality of back contact battery cells arranged along a first direction, the plurality of back contact battery cells including a first battery cell located at the end of the battery string and a solder strip located on the first battery cell; The solder strip includes a first part located on the first battery cell, and a second part connected to the first part and having a portion located on the side of the first part away from the first battery cell, and the second part is inclined in an extension direction that is offset from the first part. An insulating portion, at least covering the end of the first portion that connects to the second portion; The busbar connected to the second part is located on the side of the insulating part away from the first battery cell.

11. The photovoltaic module according to claim 10, characterized in that, When the angle formed by the extension direction of the second part and the first part is an acute angle, the size of the acute angle is 5°~85°.

12. The photovoltaic module according to claim 10 or 11, characterized in that, One of the two first battery cells in one of the battery strings is a second battery cell that is close to another battery string along the first direction, and the other is a third battery cell; The insulating portion is located on one of two adjacent second battery cells; In the solder strips that electrically connect two adjacent second battery cells, the solder strip with the first part located on the second battery cell provided with the insulating part is the first solder strip, and the solder strip with the first part located on another second battery cell is the second solder strip. The first solder strip and the second solder strip are connected to the same busbar. The tilt direction of the second portion of the first solder strip is different from the tilt direction of the second portion of the second solder strip.

13. The photovoltaic module according to claim 12, characterized in that, The angle formed by the second part of the first solder strip and the extension direction of the first part is a first acute angle, and the angle formed by the second part of the second solder strip and the extension direction of the first part is a second acute angle, wherein the first acute angle is smaller than the second acute angle.

14. The photovoltaic module according to claim 13, characterized in that, The size of the first acute angle is 5° to 45°, and the size of the second acute angle is 30° to 85°.

15. The photovoltaic module according to claim 10, characterized in that, Multiple welding strips are spaced apart on the first battery cell along a third direction, which is the direction intersecting the first direction; the busbar is provided with multiple slots arranged at intervals, and the second part is located in the slots.

16. The photovoltaic module according to claim 10 or 15, characterized in that, The second part connects to a local area of ​​the first part to form a bent part, and the bent part forms a bending angle; Wherein, the bending angle is not greater than 60°; and / or, the photovoltaic module further includes: a spacer strip, located at least on the side of the bending portion away from the first solar cell.

17. The photovoltaic module according to claim 10, characterized in that, The busbar is located between at least a portion of the second portion and the insulating portion, or the busbar is located on the side of at least a portion of the second portion away from the insulating portion.

18. The photovoltaic module according to claim 10, characterized in that, The battery string has two opposite edges along the first direction; the first battery cell also includes an edge solder joint, and the solder strip is connected to the edge solder joint and located on the side of the edge solder joint away from the first battery cell; Along the first direction, the distance between the edge solder joint and the edge is a first distance, and the distance between the busbar and the edge is a second distance, the second distance being greater than the first distance.

19. The photovoltaic module according to claim 18, characterized in that, Also includes: An adhesive dot connects the first part and the first battery cell. The distance between the adhesive dot and the edge is a third distance, and the first distance is greater than the third distance.

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