Solder strip fixing structure, back contact cell string and photovoltaic module

Abstract

The utility model relates to a solder strip fixing structure, a back contact cell string and a photovoltaic module. The welding strip fixing structure comprises a battery piece; the bonding piece comprises two bonding parts, and the two bonding parts are arranged on the battery piece side by side in the first direction; and the welding strip is arranged on the battery piece along the second direction and is arranged between the two bonding parts, so that the welding strip is bonded and fixed on the battery piece. Thus, the welding strip is wrapped by the two bonding parts on the two sides, the contact area between the welding strip and the bonding parts is effectively increased, and therefore the pulling force between the bonding parts and the welding strip is increased, reliable fixing of the welding strip is achieved, and deviation of the welding strip is avoided. Moreover, a large amount of single-point glue is adjusted into a micro double-bonding-part structural form, so that the height of the bonding parts can be effectively reduced, the solder strip is prevented from being lifted, the condition of pseudo soldering of the solder strip is further avoided, the welding quality of the solder strip is ensured, the product quality of the photovoltaic module is ensured, and the reliability of the photovoltaic module is ensured.

Description

Technical Field

[0001] This application relates to the field of solar cell technology, and in particular to a solder strip fixing structure, a back contact cell string, and a photovoltaic module. Background Technology

[0002] Currently, there are infrared welding and laser welding equipment for back-contact photovoltaic cells. Infrared welding uses thermal radiation heating, so a pressure mesh can be set above the welding strip to fix it. However, laser welding requires the laser beam to be directed onto the conductive fixing part. If a pressure mesh is used for fixing, the pressure mesh will block the laser beam and affect the welding quality. Therefore, laser welding requires other methods to fix the welding strip.

[0003] Currently, a common method is to apply adhesive to both ends of the solar cell, place the solder ribbon at the adhesive application point, use the adhesive to initially fix the solder ribbon, place the solar cell and solder ribbon between two layers of adhesive film, evacuate the two layers of adhesive film, and then use atmospheric pressure to fix the solder ribbon completely onto the solar cell, followed by laser welding.

[0004] When using adhesive dispensing for fixation, if the amount of adhesive dispensed is too small, the contact area between the solder ribbon and the adhesive will be small, resulting in low tensile strength and easy deviation of the solder ribbon. If the amount of adhesive dispensed is too large, the adhesive dots will be too high, lifting the solder ribbon and causing the solder ribbon to fail to make contact with the PAD point, resulting in a cold solder joint. Utility Model Content

[0005] Therefore, it is necessary to address the problem that insufficient or excessive adhesive application during solder ribbon fixing affects the fixation of the solder ribbon. A solder ribbon fixing structure, back contact cell string, and photovoltaic module should be provided to prevent solder ribbon misalignment and avoid incomplete soldering, thus ensuring the reliability of the photovoltaic module.

[0006] A welding strip fixing structure, comprising:

[0007] Battery cells;

[0008] An adhesive component includes two adhesive portions, which are arranged side-by-side on the battery cell along a first direction;

[0009] A solder ribbon is disposed on the battery cell along the second direction and placed between the two adhesive portions to bond and fix the solder ribbon to the battery cell.

[0010] In one embodiment of this application, the adhesive portion is a dispensing adhesive, and the solder ribbon is placed between two dispensing adhesive portions.

[0011] In one embodiment of this application, the diameter of the adhesive portion ranges from 0.2 mm to 4 mm;

[0012] And / or, the height of the adhesive portion ranges from 30μm to 200μm;

[0013] And / or, the distance between the centers of the two adhesive portions ranges from 0.2 mm to 4 mm.

[0014] In one embodiment of this application, the dimensional ratio of the adhesive portion along the first direction to the second direction ranges from 1.2 to 1.8:1;

[0015] And / or, the coverage of the two adhesive portions on the solder strip is greater than 80%.

[0016] In one embodiment of this application, the adhesive portion is an adhesive strip that extends along a second direction, and the welding strip is placed between two adhesive strips.

[0017] In one embodiment of this application, the dimension of the adhesive portion along the first direction is 0.2mm to 4mm;

[0018] And / or, the size of the adhesive portion along the second direction ranges from 0.2 mm to 6 mm;

[0019] And / or, the height of the adhesive portion ranges from 30μm to 200μm;

[0020] And / or, the distance between the centers of the two adhesive portions ranges from 0.2 mm to 4 mm.

[0021] In one embodiment of this application, the adhesive portion is an insulating adhesive or a conductive adhesive.

[0022] In one embodiment of this application, the welding strip fixing structure includes multiple welding strips and multiple adhesive members, the multiple adhesive members being spaced apart along a first direction, and each welding strip being bonded and fixed to the battery cell by a corresponding adhesive member;

[0023] And / or, each of the solder strips corresponds to two adhesive pieces, and the two adhesive pieces are spaced apart along the second direction.

[0024] A back-contact battery string, comprising at least two solder strip fixing structures as described in any of the above technical features;

[0025] The battery cells in at least two of the said welding strip fixing structures are spaced apart along a second direction, and the welding strip in the welding strip fixing structure connects the battery cells in the previous welding strip fixing structure to the battery cells in the next welding strip fixing structure.

[0026] A photovoltaic module includes at least a cover plate, a back sheet, and a plurality of back contact cell strings as described in the above technical features;

[0027] Multiple back-contact battery strings are connected in parallel and / or in series. The cover plate and the back plate are disposed on both sides of the multiple back-contact battery strings, and the cover plate, the multiple back-contact battery strings and the back plate are encapsulated to form the photovoltaic module.

[0028] By adopting the above technical solution, this application has at least the following technical effects:

[0029] The present application discloses a ribbon fixing structure, a back-contact battery string, and a photovoltaic module. In the ribbon fixing structure, two adhesive portions of the adhesive member are arranged side-by-side along a first direction on the surface of the battery cell, and the ribbon is arranged along a second direction on the surface of the battery cell. The ribbon is positioned between the two adhesive portions and contacts both adhesive portions. The two adhesive portions can bond and fix the ribbon to the surface of the battery cell.

[0030] This solder ribbon fixing structure employs two adhesive portions to secure the solder ribbon, which is positioned between the two adhesive portions to bond and fix the ribbon to the surface of the solar cell. In this way, the solder ribbon is covered by the two adhesive portions on both sides, effectively increasing the contact area between the solder ribbon and the adhesive portions, thereby increasing the tensile strength between the adhesive portions and the solder ribbon, achieving reliable fixing of the solder ribbon and preventing its displacement. Furthermore, adjusting the single-point large-volume adhesive to a micro-volume double-adhesive structure effectively reduces the height of the adhesive portions, preventing the solder ribbon from being raised, thus avoiding incomplete soldering, ensuring the welding quality of the solder ribbon, and ultimately guaranteeing the product quality and reliability of the photovoltaic module. Attached Figure Description

[0031] Figure 1 This is a top view of the welding strip fixing structure in the first embodiment of this application.

[0032] Figure 2 for Figure 1 The side view of the welding strip fixing structure shown.

[0033] Figure 3 for Figure 2 The front view of the welding strip fixing structure shown.

[0034] Figure 4 for Figure 1 Top view of the two adhesive portions in the weld strip fixing structure shown.

[0035] Figure 5 for Figure 2 A schematic diagram of the two adhesive portions in the shown welding strip fixing structure.

[0036] Figure 6 for Figure 2 The diagram shows a weld strip fixing structure in which two adhesive portions are covered with the weld strip.

[0037] Figure 7This is a top view of the welding strip fixing structure in the second embodiment of this application.

[0038] Figure 8 for Figure 7 The side view of the welding strip fixing structure shown.

[0039] Figure 9 for Figure 7 The front view of the welding strip fixing structure shown.

[0040] Figure 10 This is a top view of the welding strip fixing structure in the third embodiment of this application.

[0041] Figure 11 for Figure 10 The front view of the welding strip fixing structure shown.

[0042] Wherein: 100, welding strip fixing structure; 110, battery cell; 111, conductive fixing part; 112, main bus line; 120, adhesive part; 121, adhesive part; 130, welding strip. Detailed Implementation

[0043] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0044] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and 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 of this application.

[0045] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0046] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0047] In this application, unless otherwise expressly specified and limited, the use of descriptions such as "above" or "below" the second feature indicates that the first and second features are in direct contact, or indirect contact via an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. Similarly, "below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0048] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0049] Understandably, current stringing equipment for back-contact photovoltaic cells includes infrared welding and laser welding. Infrared welding uses thermal radiation heating, so a pressure mesh can be placed above the welding strip to fix it. However, laser welding requires the laser beam to be directed onto the conductive fixing part. If a pressure mesh is used for fixing, the pressure mesh will block the laser beam and affect the welding quality. Therefore, laser welding requires other methods to fix the welding strip.

[0050] Currently, a common method is to apply adhesive to both ends of the battery cell, place the solder ribbon at the adhesive application point, and then use the adhesive to initially fix the solder ribbon. Next, the battery cell and solder ribbon are placed between two layers of adhesive film, the two layers of adhesive film are vacuumed, and atmospheric pressure is used to completely fix the solder ribbon onto the battery cell, followed by laser welding. When using adhesive for fixation, if the amount of adhesive applied is too small, the contact area between the solder ribbon and the adhesive will be small, resulting in low tensile strength and easy solder ribbon misalignment. If the amount of adhesive applied is too large, the adhesive dots will be too high, lifting the solder ribbon and preventing it from making contact with the pad, resulting in a poor solder joint.

[0051] For this purpose, please refer to Figure 1 , Figure 7 and Figure 10 This application provides a novel welding strip fixing structure 100. Figure 1 This is a top view of the solder strip fixing structure 100 in the first embodiment of this application. Figure 7 This is a top view of the solder strip fixing structure 100 in the second embodiment of this application. Figure 10 This is a top view of the welding strip fixing structure 100 in the third embodiment of this application.

[0052] The welding ribbon fixing structure 100 is applied to the back contact cell string (not shown) of a photovoltaic module (not shown). The welding ribbon fixing structure 100 can achieve the bonding and fixing of the welding ribbon 130, thereby facilitating the series welding of two adjacent welding ribbon fixing structures 100, so as to avoid the position of the welding ribbon 130 shifting during series welding, thereby ensuring the product quality of the photovoltaic module.

[0053] The solder ribbon fixing structure 100 of this application can prevent the amount of adhesive in the bonding part 121 from being too much or too little, thereby increasing the contact area between the solder ribbon 130 and the bonding part 121, thus increasing the tension between the bonding part 121 and the solder ribbon 130, preventing the solder ribbon 130 from shifting. At the same time, it can also effectively reduce the height of the bonding part 121, preventing the solder ribbon 130 from being raised, thereby preventing the solder ribbon 130 from having a poor solder joint, ensuring the welding quality of the solder ribbon 130, and thus ensuring the product quality and reliability of the photovoltaic module.

[0054] The following describes the specific structure of the welding strip fixing structure 100 in some embodiments.

[0055] See Figure 1 , Figure 7 and Figure 10 In one embodiment, the solder ribbon fixing structure 100 includes a battery cell 110, an adhesive member 120, and a solder ribbon 130. The adhesive member 120 includes two adhesive portions 121, which are arranged side-by-side on the battery cell 110 along a first direction. The solder ribbon 130 is disposed on the battery cell 110 along a second direction and positioned between the two adhesive portions 121 to bond and fix the solder ribbon 130 to the battery cell 110.

[0056] The solar cell 110 is made of silicon wafer and is used to absorb sunlight and convert it into electric current. The specific structure and principle of the solar cell 110 are existing technologies and will not be described in detail here. The solar cell 110 extends along a first direction and a second direction. In this embodiment, the solar cell 110 is a back-contact solar cell 110. Of course, in other embodiments of this application, the solar cell 110 may be other types of solar cells 110.

[0057] The first direction and the second direction are as follows Figure 1 , Figure 7 and Figure 10 As shown, the first direction is perpendicular to the second direction. The first direction is the width direction of the battery cell 110, and the second direction is the length direction of the battery cell 110. The battery cell 110 has a certain width dimension along the first direction and a certain length dimension along the second direction.

[0058] The surface of the solar cell 110 has multiple conductive fixing portions 111, which are spaced apart along a second direction. A solder ribbon 130 is connected to the conductive fixing portions 111 by soldering, so that the solder ribbon 130 is electrically connected to the solar cell 110 through the conductive fixing portions 111. In this way, charge carriers in the solar cell 110 are output through the solder ribbon 130, thereby realizing current output. Optionally, the conductive fixing portions 111 are components such as solder pads or solder paste that facilitate soldering and fixing the solder ribbon 130 to the solar cell 110.

[0059] Furthermore, when two adjacent welding strip fixing structures 100 are connected in series, the welding equipment can use welding strips 130 to weld the battery cells 110 in the two adjacent welding strip fixing structures 100 in series, thereby forming a back contact battery string.

[0060] To facilitate the welding connection between the solder ribbon 130 and the conductive fixing part 111 of the battery cell 110, an adhesive 120 is typically used to initially fix the solder ribbon 130 to the surface of the battery cell 110. The adhesive 120 is disposed on the surface of the battery cell 110 and spaced apart from the conductive fixing part 111 along the second direction. The adhesive 120 can bond and fix the solder ribbon 130 to the surface of the battery cell 110, preventing the position of the solder ribbon 130 from shifting relative to the conductive fixing part 111.

[0061] Furthermore, the adhesive component 120 includes two adhesive portions 121, which are arranged side by side along a first direction. For example... Figure 1 , Figure 7 and Figure 10As shown, the two adhesive portions 121 are arranged adjacent to each other along the first direction. The solder ribbon 130 is located between the two adhesive portions 121, that is, the solder ribbon 130 is bonded and fixed to the surface of the battery cell 110 through the two adhesive portions 121.

[0062] Understandably, compared to a single adhesive application for fixing the solder ribbon, the solder ribbon fixing structure 100 of this application uses two adhesive portions 121 to fix the solder ribbon 130. After the solder ribbon 130 is positioned between the two adhesive portions 121, the two adhesive portions 121 are located on both sides of the solder ribbon 130, and both adhesive portions 121 can contact the solder ribbon 130. Before the adhesive portions 121 cure, the solder ribbon 130 is positioned between the two adhesive portions 121, which prevents the position of the solder ribbon 130 from shifting.

[0063] In this way, the solder ribbon 130 can be fixed to the surface of the battery cell 110 with sufficient adhesive, which greatly increases the contact area between the adhesive part 121 and the solder ribbon 130, thereby increasing the tension between the solder ribbon 130 and the adhesive part 121, achieving reliable fixation of the solder ribbon 130, preventing the position of the solder ribbon 130 relative to the conductive fixing part 111 from shifting, and enabling the solder ribbon 130 to be aligned with the conductive fixing part 111, which facilitates the subsequent welding connection between the solder ribbon 130 and the conductive fixing part 111.

[0064] Meanwhile, by using two adhesive portions 121 to fix the solder ribbon 130, the problem of excessive adhesive in one application can be avoided, thus preventing the adhesive portion 121 from being too high. This reduces the distance between the solder ribbon 130 and the battery cell 110, preventing the solder ribbon 130 from being raised excessively, and thus preventing the solder ribbon 130 from not being able to contact the conductive fixing portion 111 and causing a false weld, ensuring that the solder ribbon 130 and the conductive fixing portion 111 can be accurately welded together.

[0065] The ribbon fixing structure 100 of this application, when fixing the ribbon 130 with two adhesive portions 121 on the solar cell 110, can avoid the problem of insufficient adhesive leading to insufficient tension on the ribbon 130, increase the contact area between the ribbon 130 and the adhesive portion 121, thereby increasing the tension on the ribbon 130 to prevent the ribbon 130 from shifting. At the same time, it can also avoid the problem of excessive adhesive leading to excessive lifting of the ribbon 130, so that the ribbon 130 can accurately contact the conductive fixing portion 111, avoid incomplete soldering, ensure the welding quality of the ribbon 130, thereby ensuring the product quality and reliability of the photovoltaic module.

[0066] See Figure 1 , Figure 2 , Figure 7 and Figure 8 In one embodiment, the adhesive portion 121 is hemispherical in shape. Figure 2 for Figure 1The side view of the welding strip fixing structure 100 shown is shown. Figure 8 for Figure 7 The side view of the solder strip fixing structure 100 shown. Figure 2 and Figure 8 As can be seen, the adhesive portion 121 is hemispherical in shape, and its longitudinal cross-section is semi-circular. The two adhesive portions 121 are arranged adjacent to each other, and their edges are connected to form an integral structure.

[0067] The solder ribbon 130 is disposed between the two adhesive portions 121, with the outer surface of the solder ribbon 130 contacting each of the two adhesive portions 121 to increase the contact area between the solder ribbon 130 and the adhesive portions 121, effectively improving the tensile strength between the adhesive portions 121 and the solder ribbon 130. Furthermore, the solder ribbon 130's placement between the two adhesive portions 121 also prevents the solder ribbon 130 from sliding relative to the conductive fixing portion 111 in the first direction before the adhesive portions 121 have cured, ensuring reliable fixation of the solder ribbon 130.

[0068] Meanwhile, since the adhesive portion 121 is hemispherical, the solder ribbon 130 is positioned at the gap between the two adhesive portions 121, and is a certain distance from the highest point of the adhesive portion 121. This reduces the height of the solder ribbon 130, thereby decreasing the distance between the solder ribbon 130 and the battery cell 110, preventing the solder ribbon 130 from being raised, ensuring accurate contact between the solder ribbon 130 and the conductive fixing portion 111, and thus ensuring accurate welding connection between the solder ribbon 130 and the conductive fixing portion 111.

[0069] Furthermore, the ribbon fixing structure 100 of this application adopts a double adhesive part 121 structure, which can increase the contact area between the adhesive part 121 and the cell 110 without increasing the height of the adhesive part 121. This can effectively improve the adhesion of the adhesive part 121 on the cell 110, further improve the fixing effect of the ribbon 130, and avoid the ribbon 130 from shifting during the string welding process, thereby ensuring the product quality of the photovoltaic module.

[0070] See Figures 1 to 3 In the first embodiment of this application, the adhesive portion 121 is a dispensing adhesive, and the solder ribbon 130 is placed between two dispensing adhesive portions. Figure 3 for Figure 2 The diagram shows a front view of the solder strip fixing structure 100. In this embodiment, the adhesive portion 121 is a dotted adhesive, meaning that the adhesive portion 121 is circular in the top view and consists of circular adhesive dots. Two dots are arranged adjacent to each other, and the edges of the two dots are connected to form an integral structure.

[0071] The solder ribbon 130 is positioned between two adhesive dots, which fix the solder ribbon 130 to the surface of the battery cell 110, increasing the contact area between the solder ribbon 130 and the adhesive part 121 and ensuring the fixation effect of the solder ribbon 130. At the same time, after the solder ribbon 130 is placed between the two adhesive dots, it can be better fixed before the adhesive dots cure, preventing the solder ribbon 130 from shifting.

[0072] See Figure 2 and Figure 4 In one embodiment, the diameter D of the adhesive portion 121 ranges from 0.2 mm to 4 mm. Figure 4 for Figure 1 The diagram shows a top view of the two adhesive portions 121 in the solder ribbon fixing structure 100. Specifically, the diameter D of the adhesive portion 121 for which adhesive is applied is within the range of 0.2mm to 4mm. This ensures that the adhesive portion 121 has sufficient adhesive to bond and fix the solder ribbon 130, while also preventing excessive adhesive from being applied, thus allowing the solder ribbon 130 to accurately contact the conductive fixing portion 111.

[0073] See Figure 2 and Figure 4 In one embodiment, the distance between the centers of the two adhesive portions 121 ranges from 0.2 mm to 4 mm. That is, the distance between the center of the left adhesive portion 121 and the center of the right adhesive portion 121 is within the range of 0.2 mm to 4 mm. When the solder ribbon 130 is located between the two adhesive portions 121, both adhesive portions 121 can contact the solder ribbon 130 to increase the contact area between the solder ribbon 130 and the adhesive portions 121, so as to reliably fix the solder ribbon 130 to the battery cell 110 and prevent the position of the solder ribbon 130 relative to the conductive fixing portion 111 from shifting.

[0074] See Figure 5 In one embodiment, the height dimension H of the adhesive portion 121 ranges from 30 μm to 200 μm. Figure 5 for Figure 2 The diagram shows two adhesive portions 121 in the solder strip fixing structure 100. The height direction of the adhesive portion 121 is the same as the thickness direction of the adhesive portion 121, and the height direction of the adhesive portion 121 is perpendicular to the first direction and the second direction of the battery cell 110.

[0075] When the height dimension H of the adhesive part 121 for dispensing is in the range of 30μm to 200μm, it can ensure that the adhesive part 121 has sufficient amount of adhesive to bond and fix the solder ribbon 130. At the same time, it can also avoid the situation where there is too much adhesive in the adhesive part 121, thereby avoiding excessive lifting of the solder ribbon 130, so that the solder ribbon 130 can accurately contact the conductive fixing part 111.

[0076] See Figure 4 In one embodiment, the dimensional ratio L1:L2 of the adhesive portion 121 along the first direction to the second direction ranges from 1.2 to 1.8:1. That is, the ratio of the dimension L1 of the adhesive portion 121 along the first direction to the dimension L2 of the adhesive portion 121 along the second direction is within the range of 1.2 to 1.8:1. This ensures that the adhesive portion 121 has sufficient adhesive to bond and fix the solder ribbon 130, while also preventing excessive adhesive from being present, thus allowing the solder ribbon 130 to accurately contact the conductive fixing portion 111.

[0077] See Figure 2 and Figure 6 In one embodiment, the two adhesive portions 121 cover the welding strip 130 by more than 80%. Figure 6 for Figure 2 The diagram shows a solder ribbon fixing structure 100 in which two adhesive portions 121 cover the solder ribbon 130. That is, after the solder ribbon 130 is placed between the two adhesive portions 121, the solder ribbon 130 is wrapped by the two adhesive portions 121, so that the two adhesive portions 121 cover the outer surface of the solder ribbon 130 at the corresponding position, and the coverage rate is limited to more than 80%.

[0078] In this way, the two adhesive portions 121 can cover the larger outer surface of the corresponding solder ribbon 130 to ensure sufficient adhesive to bond and fix the solder ribbon 130. At the same time, it can also avoid excessive adhesive in the adhesive portions 121, so that the solder ribbon 130 can accurately contact the conductive fixing portion 111.

[0079] See Figures 7 to 9 In the second embodiment of this application, the adhesive part 121 is an adhesive strip that extends along the second direction, and the welding strip 130 is placed between the two adhesive strips. Figure 9 for Figure 7 The diagram shows a front view of the welding strip fixing structure 100. In this embodiment, the adhesive portion 121 is an adhesive strip.

[0080] That is, the adhesive part 121 is arranged in a strip shape in the top view, and is a long strip of adhesive dot. The adhesive part 121 has a certain length along the second direction, and the two adhesive strips are arranged adjacent to each other in the first direction, and the edges of the two adhesive strips are connected to form an integral structure.

[0081] The solder ribbon 130 is positioned between two adhesive strips, which secure the solder ribbon 130 to the surface of the battery cell 110, increasing the contact area between the solder ribbon 130 and the adhesive portion 121 and ensuring the effective fixation of the solder ribbon 130. Furthermore, placing the solder ribbon 130 between the two adhesive strips allows for better fixation of the solder ribbon 130 before the adhesive strips cure, preventing it from shifting.

[0082] See Figure 7 and Figure 8 In one embodiment, the dimension of the adhesive portion 121 along the first direction is 0.2mm to 4mm. That is, the dimension of the adhesive portion 121 along the first direction is within the range of 0.2mm to 4mm. This ensures that the adhesive portion 121 has sufficient adhesive to bond and fix the solder ribbon 130, while also preventing excessive adhesive from being present in the adhesive portion 121, so that the solder ribbon 130 can accurately contact the conductive fixing portion 111.

[0083] See Figure 7 and Figure 9 In one embodiment, the dimension of the adhesive portion 121 along the second direction ranges from 0.2mm to 6mm. That is, the dimension of the adhesive portion 121 along the second direction is within the range of 0.2mm to 6mm. This increases the contact length between the adhesive portion 121 and the solder ribbon 130, and increases the contact area between the adhesive portion 121 and the solder, so as to bond and fix the solder ribbon 130. At the same time, it can also prevent the height of the adhesive portion 121 from being too high, so that the solder ribbon 130 can accurately contact the conductive fixing portion 111.

[0084] See Figure 8 and Figure 9 In one embodiment, the height of the adhesive portion 121 ranges from 30 μm to 200 μm. The height direction of the adhesive portion 121 is the same as the thickness direction of the adhesive portion 121, and the height direction of the adhesive portion 121 is perpendicular to the first direction and the second direction of the battery cell 110.

[0085] When the height of the adhesive portion 121 of the adhesive strip is within the range of 30μm to 200μm, it can ensure that the adhesive portion 121 has sufficient adhesive to bond and fix the solder ribbon 130. At the same time, it can also avoid the situation where there is too much adhesive in the adhesive portion 121, thereby avoiding excessive lifting of the solder ribbon 130, so that the solder ribbon 130 can accurately contact the conductive fixing portion 111.

[0086] See Figure 7 and Figure 8 In one embodiment, the distance between the centers of the two adhesive portions 121 ranges from 0.2 mm to 4 mm. That is, the distance between the center of the left adhesive portion 121 and the center of the right adhesive portion 121 is within the range of 0.2 mm to 4 mm. When the solder ribbon 130 is located between the two adhesive portions 121, both adhesive portions 121 can contact the solder ribbon 130 to increase the contact area between the solder ribbon 130 and the adhesive portions 121, so as to reliably fix the solder ribbon 130 to the battery cell 110 and prevent the position of the solder ribbon 130 relative to the conductive fixing portion 111 from shifting.

[0087] In the first and second embodiments of this application, the adhesive portion 121 is an insulating adhesive. That is, the adhesive portion 121 in the first and second embodiments only serves to bond and fix the solder ribbon 130 to the surface of the battery cell 110.

[0088] See Figure 10 and Figure 11 In the third embodiment of this application, the adhesive portion 121 is a conductive adhesive. Figure 11 for Figure 10 The diagram shows a front view of the solder ribbon fixing structure 100. Specifically, in this embodiment, conductive adhesive is used to fix the solder ribbon 130. (As shown...) Figure 10 and Figure 11 As shown, the surface of the battery cell 110 has a main grid line 112 extending in a second direction, and a conductive fixing part 111 is disposed on the main grid line 112 and electrically connected to the main grid line 112.

[0089] The conductive adhesive bonding portion 121 is provided on the main grid line 112. On the one hand, the bonding portion 121 can fix the solder ribbon 130. On the other hand, the conductive adhesive bonding portion 121 can directly connect the main grid line 112 and the solder ribbon 130, so that the current of the cell 110 can be directly transmitted to the solder ribbon 130 through the main grid line 112 and the bonding portion 121, without having to pass through the conductive fixing portion 111 to transmit it to the solder ribbon 130, thereby improving the current collection efficiency and thus improving the power of the photovoltaic module.

[0090] In this embodiment, the adhesive portion 121 for conductive adhesive is a dispensing part, and its dimensional parameters are substantially the same as those of the dispensing adhesive portion 121 in the first embodiment, which will not be described again here. Of course, in other embodiments of this application, the adhesive portion 121 for conductive adhesive may also be arranged in a strip shape, that is, the adhesive strip in the second embodiment.

[0091] In one embodiment, the adhesive portion 121 includes, but is not limited to, UV-curable adhesive or thermosetting adhesive, and may also be other types of curing adhesive. Before the adhesive portion 121 is cured, the solder ribbon 130 is placed between the two adhesive portions 121, and the two uncured adhesive portions 121 can cover the solder ribbon 130 to prevent the solder ribbon 130 from shifting relative to the conductive fixing portion 111.

[0092] See Figure 1 , Figure 7 and Figure 10 In one embodiment, the welding strip fixing structure 100 includes multiple welding strips 130 and multiple adhesive members 120. The multiple adhesive members 120 are spaced apart along a first direction, and each welding strip 130 is bonded and fixed to the battery cell 110 by a corresponding adhesive member 120.

[0093] There are multiple solder ribbons 130, each extending along a second direction, and the multiple solder ribbons 130 are spaced apart along a first direction. In this way, by using multiple solder ribbons 130 to connect two adjacent solar cells 110, the current collection path can be increased, thereby improving the efficiency of the photovoltaic module.

[0094] Furthermore, there are multiple adhesive members 120, which are spaced apart along the first direction and corresponding to the solder ribbons 130. In this way, each solder ribbon 130 can be fixed to the battery cell 110 by two adhesive portions 121 in the corresponding adhesive member 120, so as to avoid the position of the solder ribbon 130 being misaligned, and at the same time, it can also ensure that the solder ribbon 130 accurately contacts the conductive fixing portion 111.

[0095] See Figure 1 , Figure 7 and Figure 10 In one embodiment, each solder strip 130 corresponds to two adhesive members 120, and the two adhesive members 120 are spaced apart along the second direction. That is, each solder strip 130 is fixed by two adhesive members 120, i.e., four adhesive portions 121.

[0096] Two adhesive members 120 are spaced apart along the second direction and located at both ends of the plurality of conductive fixing portions 111. That is, the two adhesive members 120 are located at the beginning and end of the plurality of conductive fixing portions 111 along the second direction. In this way, the two adhesive members 120 can fix the solder ribbon 130 at the beginning and end, aligning the solder ribbon 130 with the conductive fixing portion 111 and preventing the solder ribbon 130 from shifting relative to the conductive fixing portion 111.

[0097] The solder ribbon fixing structure 100 of this application improves upon the current single-point large-volume adhesive method by replacing it with two micro-volume adhesive portions 121. This effectively reduces the adhesive buildup height, allowing the solder ribbon 130 to be placed between the two adhesive portions 121, thus covering the solder ribbon 130 on both sides. This effectively increases the contact area between the solder ribbon 130 and the adhesive portions 121, thereby increasing the tensile strength between the adhesive portions 121 and the solder ribbon 130. Furthermore, the location of the solder ribbon 130 between the two adhesive portions 121 prevents the solder ribbon 130 from shifting position before the adhesive portions 121 have cured.

[0098] Meanwhile, by configuring the adhesive component 120 into two adhesive portions 121, the height of the adhesive portions 121 can be reduced, avoiding excessive elevation of the solder ribbon 130. This prevents the solder ribbon 130 from not contacting the conductive fixing portion 111, thus avoiding incomplete soldering and ensuring the welding quality of the solder ribbon 130. Consequently, the product quality and reliability of the photovoltaic module are guaranteed. Furthermore, the two adhesive portions 121 can increase their contact area with the solar cell 110, improving the adhesion of the adhesive portion 121 to the solar cell 110. Ultimately, this effectively improves the fixing effect of the solder ribbon 130 and prevents the solder ribbon 130 from shifting during the welding process.

[0099] This application also provides a back-contact battery string, including at least two solder ribbon fixing structures 100 as described in any of the above embodiments. Battery cells 110 in the at least two solder ribbon fixing structures 100 are spaced apart along a second direction, and solder ribbons 130 in the solder ribbon fixing structures 100 connect battery cells 110 in the preceding solder ribbon fixing structure 100 to battery cells 110 in the following solder ribbon fixing structure 100.

[0100] After adopting the above-mentioned solder ribbon fixing structure 100, the back contact battery string of this application can ensure the welding effect between the solder ribbon 130 and the battery cell 110, avoid the position of the solder ribbon 130 shifting during the stringing process, and at the same time, avoid the situation of poor soldering between the solder ribbon 130 and the conductive fixing part 111 of the battery cell 110, thus ensuring the product quality of the back contact battery string.

[0101] This application also provides a photovoltaic module, which includes at least a cover plate, a back sheet, and a plurality of back contact cell strings as described in the above embodiments. The plurality of back contact cell strings are connected in parallel and / or in series, and the cover plate and the back sheet are disposed on both sides of the plurality of back contact cell strings, thereby encapsulating the cover plate, the plurality of back contact cell strings, and the back sheet to form a photovoltaic module.

[0102] The back contact batteries in the above embodiments are connected in series and / or in parallel and placed between the cover plate and the back plate. The cover plate, the multiple back contact battery strings and the back plate are encapsulated using an encapsulation process to form the photovoltaic module of this application.

[0103] The photovoltaic module of this application uses a solder ribbon fixing structure 100 to prepare the back contact cell string, which can ensure accurate welding connection between the solder ribbon 130 and the cell 110, avoid the solder ribbon 130 from shifting, and at the same time, ensure accurate welding connection between the solder ribbon 130 and the conductive fixing part 111, avoid the solder ribbon 130 from having a poor weld, and ensure the welding quality of the solder ribbon 130, thereby ensuring the product quality and reliability of the photovoltaic module.

[0104] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0105] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A welding strip fixing structure, characterized in that, include: Battery cell (110); The adhesive component (120) includes two adhesive portions (121), which are arranged side by side on the battery cell (110) along a first direction. A solder ribbon (130) is disposed on the battery cell (110) along the second direction and placed between the two adhesive portions (121) to bond and fix the solder ribbon (130) to the battery cell (110).

2. The welding strip fixing structure according to claim 1, characterized in that, The adhesive portion (121) is a dispensing adhesive, and the solder ribbon (130) is placed between the two dispensing adhesive portions.

3. The welding strip fixing structure according to claim 2, characterized in that, The diameter of the adhesive portion (121) ranges from 0.2 mm to 4 mm; And / or, the height dimension of the adhesive portion (121) ranges from 30μm to 200μm; And / or, the distance between the centers of the two adhesive portions (121) is in the range of 0.2 mm to 4 mm.

4. The welding strip fixing structure according to claim 2, characterized in that, The dimensional ratio of the adhesive portion (121) along the first direction to the second direction is in the range of 1.2 to 1.8:1; And / or, the two adhesive portions (121) cover the solder strip (130) by more than 80%.

5. The welding strip fixing structure according to claim 1, characterized in that, The adhesive part (121) is an adhesive strip that extends in a second direction, and the welding strip (130) is placed between two adhesive strips.

6. The welding strip fixing structure according to claim 5, characterized in that, The adhesive portion (121) has a dimension of 0.2 mm to 4 mm along the first direction; And / or, the size of the adhesive portion (121) along the second direction ranges from 0.2 mm to 6 mm; And / or, the height dimension of the adhesive portion (121) ranges from 30μm to 200μm; And / or, the distance between the centers of the two adhesive portions (121) is in the range of 0.2 mm to 4 mm.

7. The welding strip fixing structure according to any one of claims 1 to 6, characterized in that, The adhesive part (121) is an insulating adhesive or a conductive adhesive.

8. The welding strip fixing structure according to any one of claims 1 to 6, characterized in that, The welding strip fixing structure (100) includes multiple welding strips (130) and multiple adhesive members (120). The multiple adhesive members (120) are spaced apart along a first direction, and each welding strip (130) is bonded and fixed to the battery cell (110) by the corresponding adhesive member (120). And / or, each of the solder strips (130) corresponds to two adhesive pieces (120), and the two adhesive pieces (120) are spaced apart along the second direction.

9. A back-contact battery string, characterized in that, Includes at least two welding strip fixing structures (100) as described in any one of claims 1 to 8; At least two of the solder strip fixing structures (100) have their battery cells (110) spaced apart along a second direction, and the solder strip (130) in the solder strip fixing structure (100) connects the battery cell (110) in the previous solder strip fixing structure (100) to the battery cell (110) in the next solder strip fixing structure (100).

10. A photovoltaic module, characterized in that, It includes at least a cover plate, a back plate, and a plurality of back contact battery strings as described in claim 9; Multiple back-contact battery strings are connected in parallel and / or in series. The cover plate and the back plate are disposed on both sides of the multiple back-contact battery strings, and the cover plate, the multiple back-contact battery strings and the back plate are encapsulated to form the photovoltaic module.

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