A photovoltaic module

Abstract

The application relates to a photovoltaic module, which comprises a cell string, a busbar and at least one welding strip for connecting the busbar and a cell piece of the cell string. The busbar is located on the side where the cell piece back surface is located along the thickness direction of the photovoltaic module, and at least part of the projection of the busbar is located in the projection range of the cell string in the projection along the thickness direction of the photovoltaic module. The welding strip comprises a connecting section and a bending section, the connecting section is connected with the cell piece, the bending section is bent towards the cell piece back surface and connected with the busbar, and the extension direction of the bending section is not parallel to the extension direction of the connecting section. Through the design, the busbar can be arranged on the back side of the cell piece, the space occupied by the busbar in the length direction of the photovoltaic module is reduced, the area ratio of the cell piece is improved, and the efficiency of the photovoltaic module is improved.

Description

Technical Field

[0001] This application relates to the field of solar cell technology, and more specifically to a photovoltaic module. Background Technology

[0002] With technological advancements, the application of photovoltaic (PV) modules has become increasingly widespread. PV modules consist of busbars and solar cells. Typically, the busbars are arranged along the length of the PV module on opposite sides of the cell string. This design requires the busbars to occupy a certain amount of space along the length of the PV module, affecting the cell layout and resulting in a lower cell area ratio, thus impacting the efficiency of the PV cells. Summary of the Invention

[0003] In view of this, this application provides a photovoltaic module to help solve the problem of low area ratio of solar cells in the prior art.

[0004] In a first aspect, embodiments of this application provide a photovoltaic module, the photovoltaic module comprising:

[0005] A battery string, the battery string comprising battery cells;

[0006] Busbar;

[0007] At least one solder strip is provided for connecting the battery cell and the busbar;

[0008] Wherein, along the thickness direction of the photovoltaic module, the busbar is located on the side where the back of the solar cell is located, and in the projection along the thickness direction of the photovoltaic module, at least a portion of the projection of the busbar is located within the projection range of the solar cell string. The solder strip includes interconnected connecting segments and bent segments. The connecting segments are connected to the solar cell, and the bent segments are bent toward the side where the back of the solar cell is located and connected to the busbar. The extension direction of the bent segments is not parallel to the extension direction of the connecting segments.

[0009] In one possible implementation, there is an angle between the extending direction of the bent segment and the extending direction of the connecting segment, the angle ranging from 5° to 25°.

[0010] In one possible implementation, the solar cell includes multiple solder joints, and the solder joint closest to the busbar along the length of the photovoltaic module is the first solder joint, with the connecting section and the bending section located on opposite sides of the first solder joint;

[0011] The bending section includes a first bending section and a second bending section that are connected to each other. The first bending section is connected to the connecting section, and the second bending section is connected to the busbar.

[0012] In one possible implementation, the connecting segment and the second bending segment of the same solder strip are located on the same side of the battery string, or the connecting segment and the second bending segment of the same solder strip are located on different sides of the battery string.

[0013] In one possible implementation, along the thickness direction of the photovoltaic module, the second bending segment is located on the side of the busbar facing the battery string, or along the thickness direction of the photovoltaic module, the second bending segment is located on the side of the busbar away from the battery string.

[0014] In one possible implementation, at least a portion of the bent section extends beyond the edge of the battery string along the length of the photovoltaic module, and the extension distance is L1, which ranges from 0.1 mm to 2 mm.

[0015] In one possible implementation, the busbar does not extend beyond the edge of the battery string along the length of the photovoltaic module.

[0016] In one possible implementation, the photovoltaic module further includes an isolator located between the busbar and the solar cell along the thickness direction of the photovoltaic module.

[0017] In one possible implementation, the insulating member includes an insulating portion and a buffer portion, which are arranged sequentially along the thickness direction of the photovoltaic module.

[0018] In one possible implementation, along the thickness direction of the photovoltaic module, the insulating portion is located on the side of the buffer portion facing the busbar.

[0019] This application provides a photovoltaic module, which includes a cell string, a busbar, and at least one solder strip for connecting the busbar and the cell string. Along the thickness direction of the photovoltaic module, the busbar is located on the side containing the back of the cell, and at least a portion of the projection of the busbar along the thickness direction of the photovoltaic module lies within the projection range of the cell string. The solder strip includes a connecting section and a bent section. The connecting section connects to the cell, and the bent section bends towards the back of the cell and connects to the busbar, with the extension direction of the bent section not parallel to the extension direction of the connecting section. This design allows the busbar to be positioned on the back side of the cell, reducing the space occupied by the busbar along the length of the photovoltaic module, thereby increasing the area ratio of the cell and ultimately improving the efficiency of the photovoltaic module.

[0020] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the photovoltaic module provided in this application;

[0023] Figure 2 This is a schematic diagram showing the unfolded form of the first embodiment of the photovoltaic module provided in this application;

[0024] Figure 3 This is a schematic diagram showing the unfolded form of the second embodiment of the photovoltaic module provided in this application;

[0025] Figure 4 This is a cross-sectional schematic diagram of the second embodiment of the photovoltaic module provided in this application;

[0026] Figure 5 This is a cross-sectional schematic diagram of the first embodiment of the photovoltaic module provided in this application;

[0027] Figure 6 This is a partial schematic diagram of the third embodiment of the photovoltaic module provided in this application;

[0028] Figure 7 This is a partial schematic diagram of the fourth embodiment of the photovoltaic module provided in this application;

[0029] Figure 8 This is a partial schematic diagram of the fifth embodiment of the photovoltaic module provided in this application;

[0030] Figure 9 for Figure 1 A magnified view of the central position (I).

[0031] Figure label:

[0032] 1-Battery cell;

[0033] 2-Busbar;

[0034] 3-Welding strip;

[0035] 31-Connecting segment;

[0036] 32-bending section;

[0037] 321 - First bend;

[0038] 322 - Second bend section;

[0039] 4- Solder joint;

[0040] 41 - First solder joint;

[0041] 42 - Second solder joint;

[0042] 5-Isolation components;

[0043] 51-Insulation part;

[0044] 52-Buffer section. Detailed Implementation

[0045] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0046] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0047] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0048] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0049] like Figure 1 As shown in the figure, this application embodiment provides a photovoltaic module, wherein the photovoltaic module includes a cell string, a busbar 2, and at least one solder strip 3. The cell string includes cell 1, and the number of cell 1 can be selected according to the size of the photovoltaic module. Adjacent cell 1 can be connected by connectors such as solder wires. The cell 1 of the same cell string is arranged along the length direction X of the photovoltaic module, and each cell string can be arranged along the length direction X or the width direction of the photovoltaic module respectively. The busbar 2 is usually made of materials such as silver, aluminum, or copper, and is used for conductivity, current shunting, etc. The busbar 2 is connected to the cell 1 of the cell string through the solder strip 3. Along the thickness direction Z of the photovoltaic module, the busbar 2 is located on the side where the back of the cell 1 is located. At the same time, in the projection along the thickness direction Z of the photovoltaic module, at least a part of the projection of the busbar 2 is located within the projection range of the cell string. Figure 2As shown, the welding strip 3 includes a connecting section 31 and a bending section 32, which are connected to each other. The connecting section 31 is used to connect with the battery cell 1 of the battery string. The bending section 32 bends towards the side where the back of the battery cell 1 is located and connects with the busbar 2. The extending direction of the bending section 32 is not parallel to the extending direction of the connecting section 31.

[0050] By placing the busbar 2 on the back side of the solar cell 1, at least a portion of the busbar 2 overlaps with the solar cell string in the thickness direction Z of the photovoltaic module. When calculating the space occupied by the busbar 2 in the length direction X of the photovoltaic module, the overlapping portion of the busbar 2 with the solar cell string does not need to be calculated. Therefore, the space occupied by the busbar 2 in the length direction X of the photovoltaic module can be reduced. With the length dimension X of the photovoltaic module remaining unchanged, the size occupied by the busbar 2 in the length direction X is reduced, thus leaving more space for arranging the solar cell 1. This increases the area ratio of the solar cell 1 in the photovoltaic module, thereby improving the conversion efficiency of the photovoltaic module. At the same time, folding the busbar 2 towards the back of the solar cell 1 reduces the possibility of the busbar 2 shading the solar cell 1, further improving the efficiency of the photovoltaic module. The extension direction of the bending segment 32 is not parallel to the extension direction of the connecting segment 31, which can make the bending segment 32 misaligned with the connecting segment 31 after bending, reducing the possibility of the bending segment 32 and the connecting segment 31 overlapping in the thickness direction Z of the photovoltaic module, thereby reducing the possibility of microcracks in the photovoltaic module during the lamination process.

[0051] Busbar 2 can be folded to the side of the back of battery cell 1 after welding with the welding strip 3, or busbar 2 can be directly set on the side of the back of battery cell 1 and then welded with the welding strip 3. That is, the welding strip 3 and busbar 2 can be welded first and then folded, or the position of busbar 2 can be set first and then welded. The specific processing steps can be selected according to the actual situation.

[0052] like Figure 3 and Figure 4 As shown, in the scheme where the bending section 32 and the connecting section 31 are not misaligned, after the busbar 2 is folded to the back of the cell 1, along the thickness direction Z of the photovoltaic module, the bending section 32 and the connecting section 31 of the same solder strip 3 have an overlapping area. This method increases the distance between the busbar 2 and the cell 1, resulting in an increase in the thickness of the photovoltaic module at a local location. During lamination, the stress at the corresponding location increases, which can easily lead to the risk of microcracks and affect the quality of the photovoltaic module.

[0053] like Figure 2 and Figure 5 As shown, this is a scheme where the bent section 32 and the connecting section 31 are staggered. Figure 2 This is a schematic diagram of the unfolded state, i.e., before the solder strip 3 is bent. The state of the busbar 2 after folding is shown below. Figure 5 As shown, Figure 5 This is a schematic cross-sectional view of the photovoltaic module after the busbar is folded. The bent section 32 and the connecting section 31 of the solder strip 3 are staggered, so that after the busbar 2 is folded, the bent section 32 and the connecting section 31 of the solder strip 3 do not overlap. This helps to reduce the distance between the busbar 2 and the solar cell 1, reduce the thickness of the corresponding area, thereby reducing the stress on this area during lamination, reducing the risk of microcracks, reducing the possibility of damage to the photovoltaic module, and improving the quality of the photovoltaic module.

[0054] The solution provided in this application reduces the space occupied by the busbar 2 in the length direction X of the photovoltaic module by folding the busbar 2 to the back of the solar cell 1 and staggering the solder ribbon 3. This allows for more space to be arranged in the photovoltaic module to accommodate the solar cell 1, increasing the area ratio of the solar cell 1 and thus improving the efficiency of the photovoltaic module. Simultaneously, by staggering and bending the solder ribbon 3, the thickness of the photovoltaic module can be reduced, thereby reducing the height difference between the busbar 2 and the solar cell 1, reducing the possibility of stress concentration, and helping to reduce the possibility of microcracks in the photovoltaic module during lamination, improving the quality of the photovoltaic module and increasing the yield rate.

[0055] It should be noted that the busbar 2 involved in the solution provided in this application embodiment can be a busbar located at both ends of the photovoltaic module, i.e., the first and last busbars, or it can be an intermediate busbar located between the first and last busbars along the length direction X of the photovoltaic module.

[0056] like Figure 2 As shown, in one possible implementation, there is an angle α between the extending direction of the bent section 32 and the extending direction of the connecting section 31, and the angle α ranges from 5° to 25°. The size of the angle α can be 5°, 7°, 9°, 11°, 13°, 15°, 17°, 19°, 21°, 23°, 25°, etc. The angle α between the extending direction of the bent section 32 and the extending direction of the connecting section 31 can be selected from a suitable angle within the range of 5° to 25° depending on the circumstances. The angle α mentioned here usually refers to the angle between the extending direction of the bent section 32 and the extending direction of the connecting section 31 before the welding strip 3 is folded.

[0057] This design allows the solder strips 3 to be misaligned after folding, reducing the possibility of overlapping portions. When the included angle is less than 5°, the tilt angle of the bent section 32 relative to the connecting section 31 is small, and overlapping areas are likely to appear in the bent solder strips 3, affecting the misalignment effect and increasing the risk of microcracks in the photovoltaic module. When the included angle is greater than 25°, due to the large tilt angle of the bent section 32 relative to the connecting section 31, the bent section 32 is likely to intersect with the extension direction of the connecting section 31 of the adjacent solder strips 3. After folding, adjacent solder strips 3 are likely to come into contact, potentially leading to short circuits and affecting the quality of the photovoltaic module. Therefore, in the solution provided in this application embodiment, the included angle between the extension direction of the bent section 32 and the extension direction of the connecting section 31 is in the range of 5° to 25°, so that the solder strips 3 can be misaligned after folding while also reducing the possibility of contact between adjacent solder strips 3. This improves the quality of the photovoltaic module and better meets actual usage requirements.

[0058] In one possible implementation, since the bent section 32 is inclined relative to the connecting section 31 in the solution provided by this application embodiment, in order to facilitate the connection between the busbar 2 and the solder strip 3, the busbar 2 can be moved 0.2 mm to 5 mm in the inclined direction of the bent section 32 based on the original condition. Typically, the busbar 2 is used to connect two adjacent battery strings, and the center of the busbar 2 passes through the middle position of the two adjacent battery strings. For example, if the distance between two adjacent battery strings is m, and the straight line l is located between the two adjacent battery strings, and the distance from the straight line l to either of the two adjacent battery strings is 0.5 m, when the solder strip 3 is not misaligned, i.e., the bent section 32 is parallel to the connecting section 31 and is on the same straight line, the center of the busbar 2 used to connect the two battery strings is usually located on the straight line l. After the welding strip 3 is designed with a stagger, i.e., the extension direction of the bent section 32 and the extension direction of the connecting section 31 form an angle, the busbar 2 can be moved a certain distance in the inclined direction of the bent section 32. This distance can be 0.2 mm to 5 mm, that is, the distance between the center of the busbar 2 and the straight line l is 0.2 mm to 5 mm. Depending on the actual needs, this distance can be 0.2 mm, 0.6 mm, 1.0 mm, 1.4 mm, 1.8 mm, 2.2 mm, 2.6 mm, 3.0 mm, 3.4 mm, 3.8 mm, 4.2 mm, 4.6 mm, 5.0 mm, etc. Figure 2 As shown, in one possible implementation, before the folding, the distance between the end position of the bent section 32 of the welding strip 3 that is connected to the busbar 2 and the extension direction of the connecting section 31 is L3. The distance L3 can be the same as the distance between the center of the busbar and the straight line l, that is, 0.2 mm ≤ L3 ≤ 5 mm.

[0059] This design facilitates the connection between the solder strip 3 and the busbar 2, reducing the possibility that the solder strip 3 may fail to connect to the busbar 2 or the contact area may be reduced after the bent section 32 of the solder strip 3 located at the edge is tilted relative to the connecting section 31, thus affecting the connection stability between the solder strip 3 and the busbar 2.

[0060] like Figure 2 As shown, in one possible implementation, the solar cell 1 may include multiple solder points 4, including a first solder point 41 and a second solder point 42. The solder points 4 are arranged along the length X of the photovoltaic module. Along the length X of the photovoltaic module, the solder point 4 closest to the busbar 2 is the first solder point 41, and the remaining solder points 4 are the second solder points 42. Typically, the first solder point 41 is the solder point 4 of the solar cell 1 closest to the edge of the cell string along the length X of the photovoltaic module. The connecting segment 31 and the bending segment 32 are located on opposite sides of the first solder point 41, that is, the positions of the bending segment 32 and the connecting segment 31 can be divided by the first solder point 41. The solder strip 3 located on the side of the first solder point 41 facing the edge of the cell string is the bending segment 32, and the solder strip 3 located on the other side is the connecting segment 31. It should be noted that the solder strip 3 can be a single, complete solder strip 3 passing through the first solder point 41. The bending segment 32 and the connecting segment 31 are connected and do not break at the first solder point 41. The bending segment 32 may include a first bending segment 321 and a second bending segment 322 that are connected to each other. The first bending segment 321 is used to connect with the connecting segment 31, and the second bending segment 322 is used to connect with the busbar 2. When folding, the second bending segment 322 is bent toward the side where the back of the battery cell 1 is located. After folding, the second bending segment 322 is located on the side of the first bending segment 321 facing the busbar 2.

[0061] The first bending segment 321 can serve as a transition segment between the connecting segment 31 and the second bending segment 322. During folding, the bending position can be located between the first bending segment 321 and the second bending segment 322. This design allows the busbar 2 to be located on the back side of the solar cell 1 and connected to the solar cell 1 via the welding strip 3, thereby reducing the space occupied by the busbar 2 in the length direction X of the photovoltaic module, which is beneficial to increasing the area ratio of the solar cell 1 and improving the efficiency of the photovoltaic module.

[0062] like Figure 6 and Figure 7 As shown, in one possible implementation, the connecting segment 31 and the second bending segment 322 of the same welding strip 3 are located on the same side of the battery string, or the connecting segment 31 and the second bending segment 322 of the same welding strip 3 are located on different sides of the battery string. That is, the connecting segment 31 and the second bending segment 322 of the same welding strip 3 can be located on the same side of the battery string or on different sides.

[0063] In the solution provided in this application embodiment, the solder strip 3 for connecting the busbar 2 and the battery cell 1 can be led out from either the front or back of the battery cell 1. That is, the connecting segment 31 can be located on either the front or back of the battery cell 1. When the connecting segment 31 is located on the front of the battery cell 1, after folding, the second bent segment 322 and the connecting segment 31 are located on opposite sides of the battery cell 1. When the connecting segment 31 is located on the back of the battery cell 1, after folding, the second bent segment 322 and the connecting segment 31 are located on the same side of the battery cell 1.

[0064] The solution provided in this application embodiment can, according to the structure of the battery string and actual needs, place the solder ribbon 3 used to connect the busbar 2 on the front or back of the battery cell 1. This can help reduce the possibility of interference between the solder ribbon 3 and the battery string structure, and reduce the possibility of short circuits. When the solder ribbon 3 is led out from the front of the battery cell 1, the thickness of the battery cell 1 needs to be considered when bending the solder ribbon 3 towards the back of the battery cell 1. Therefore, under normal circumstances, the solder ribbon 3 led out from the front of the battery cell 1 can be 0.2 mm to 2 mm longer than the solder ribbon 3 led out from the back of the battery cell 1. The specific dimensions can be 0.2 mm, 0.4 mm, 0.6 mm, 0.8 mm, 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, etc.

[0065] like Figure 1 As shown, in one possible implementation, among the two battery strings connected to the same busbar 2, the two battery cells 1 used to connect to the busbar 2 can have their solder ribbons 3 drawn from the front and back of the battery cell 1, respectively, depending on the arrangement requirements of the photovoltaic module. The solution provided in this application embodiment can be applied to structures where the solder ribbon 3 is drawn from the front or back of the battery cell 1, offering greater flexibility in practical use and adapting to battery strings with different structures, thus better meeting actual usage requirements.

[0066] like Figure 6 As shown, in one possible implementation, along the thickness direction Z of the photovoltaic module, the second bending segment 322 is located on the side of the busbar 2 facing the cell string, or, as... Figure 8 As shown, along the thickness direction Z of the photovoltaic module, the second bending segment 322 is located on the side of the busbar 2 away from the battery string.

[0067] In practical use, the welding strip 3 can be connected to different sides of the busbar 2 as needed to reduce welding difficulty and facilitate folding. This design not only improves welding quality but also reduces processing difficulty, making it more suitable for actual use.

[0068] In one possible implementation, the second bent section 322 of the solder ribbon 3 connected to the same cell 1 is located on the side of the busbar 2 facing the cell string, or, along the thickness direction Z of the photovoltaic module, the second bent section 322 of the solder ribbon 3 connected to the same cell 1 is located on the side of the busbar 2 away from the cell string. That is, the connection structure of the solder ribbon 3 connecting the same cell 1 to the busbar 2 is the same.

[0069] In one possible implementation, the solder strip 3 extending from the front of the battery cell 1 can be connected to the side of the busbar 2 that is folded away from the battery string, and the solder strip 3 extending from the back of the battery cell 1 can be connected to the side of the busbar 2 that is folded towards the battery string.

[0070] When using a welding-then-folding method, this design allows for welding of the solder strip 3 to the side of the busbar 2 closest to each other, reducing welding difficulty. Simultaneously, this design facilitates subsequent processing and use by directly determining whether the solder strip 3 originates from the front or back of the battery cell 1 based on its connection position with the busbar 2, making it more convenient in practical applications. Furthermore, this design allows the second bending segments 322 to be distributed on opposite sides of the busbar 2, increasing the distance between adjacent second bending segments 322 and reducing the possibility of contact between them, which could lead to short circuits and better meet actual usage requirements.

[0071] In one possible implementation, the photovoltaic module can be a back-contact module (BC module), and the solar cell 1 is a back-contact solar cell. When the solar cell 1 is a back-contact solar cell, the connecting segment 31 of the solder ribbon 3 is located on the back side of the solar cell 1, while the bending segment 32 bends towards the back side of the solar cell 1. The connecting segment 31 and the bending segment 32 are located on the same side of the solar cell. When the photovoltaic module is a type other than a back-contact module, for example, the solar cell 1 can be a TOPCon cell. Each connecting segment 31 can be led out from the front side or the back side of the solar cell 1 according to actual needs. In one possible implementation, the solder ribbon 3 of adjacent solar cell strings have different lead-out directions. For example, adjacent solar cell strings are a first solar cell string and a second solar cell string. The solder ribbon 3 located in the first solar cell string is led out from the front side of the solar cell 1 and connected to the busbar 2, while the solder ribbon 3 located in the second solar cell string can be led out from the back side of the solar cell 1 and connected to the busbar 2.

[0072] like Figure 9As shown, in one possible implementation, at least a portion of the bent segment 32 extends beyond the edge of the cell string along the length direction X of the photovoltaic module, with an extension distance L1, where 0.1 mm ≤ L1 ≤ 2 mm. In the projection along the thickness direction Z of the photovoltaic module, the connection between the first bent segment 321 and the second bent segment 322 lies outside the projection range of the cell 1, and the extension distance L1 can be 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2.0 mm, etc.

[0073] This design facilitates the bending of the solder ribbon 3. When the excess distance is less than 0.1 mm, bending the solder ribbon 3 is difficult, which is not conducive to actual production and processing. When the excess distance is greater than 2 mm, the solder ribbon 3 will occupy a large space in the length direction X of the photovoltaic module due to its large excess distance, thus affecting the arrangement of the cells 1 and consequently the area ratio of the cells 1. Therefore, in the solution provided in this application embodiment, after folding, the distance L1 of the solder ribbon 3 exceeding the edge of the cell string is in the range of 0.1 mm to 2 mm. This not only reduces the difficulty of bending the solder ribbon 3, but also reduces the space occupied by the part of the solder ribbon 3 that exceeds the edge of the cell string. This is beneficial for optimizing the arrangement of the cells 1, increasing the area ratio of the cells 1, and allowing the photovoltaic module to have a larger area for absorbing light, which is conducive to improving the efficiency of the photovoltaic module.

[0074] like Figure 9 As shown, in one possible implementation, the busbar 2 does not extend beyond the edge of the battery string along the length direction X of the photovoltaic module.

[0075] This design allows all busbars 2 to be placed on the back side of the battery string. Therefore, when calculating the dimensions along the length X of the photovoltaic module, the dimensions of the busbars 2 can be ignored. As a result, more solar cells 1 and / or larger solar cells 1 can be arranged without changing the overall length of the photovoltaic module. This helps to increase the area ratio of solar cells 1, thereby improving the efficiency of the photovoltaic module and better meeting actual usage needs.

[0076] like Figure 6 As shown, in one possible implementation, the photovoltaic module further includes an insulating member 5, which is located between the busbar 2 and the cell 1 along the thickness direction Z of the photovoltaic module.

[0077] The spacer 5 serves as insulation and buffer. Placed between the busbar 2 and the solar cell 1, it reduces excessive contact between the busbar 2, solder ribbon 3, and solar cell 1, potentially leading to short circuits. The spacer 5 can be made of materials such as PET film or PI film. During the photovoltaic module lamination process, the spacer 5 also acts as a shock absorber and buffer, absorbing force and thus reducing the possibility of microcracks in the photovoltaic module, better meeting practical application requirements.

[0078] like Figure 6 As shown, in one possible implementation, the separator 5 may include an insulating portion 51 and a buffer portion 52. The insulating portion 51 mainly serves as insulation to reduce the possibility of unnecessary contact between the busbar 2, the solder ribbon 3, and the solar cell 1. The buffer portion 52 is mainly used for shock absorption and cushioning to reduce the possibility of microcracks appearing in the photovoltaic module during lamination. The insulating portion 51 and the buffer portion 52 can be an integral structure or separate structures. When the buffer portion 52 and the insulating portion 51 are separate structures, they can be connected by means of heat fusion or other methods. The buffer portion 52 may be made of an adhesive film with good shock absorption and cushioning properties, such as EVA film.

[0079] like Figure 6 As shown, in one possible implementation, the insulating portion 51 is located on the side of the buffer portion 52 facing the busbar 2.

[0080] This design helps improve the insulation effect of the isolator 5. Positioning the insulating part 51 closer to the busbar 2 on the side of the isolator 5 reduces the distance between the insulating part 51 and the busbar 2, allowing the insulating part 51 to better adhere to and contact the busbar 2. This improves the insulation effect of the isolator 5, reduces the possibility of unnecessary contact between other components and the busbar 2, and better meets actual usage requirements.

[0081] like Figure 9 As shown, in one possible implementation, the width of the isolator 5 is 'a', and the width of the busbar 2 is 'b', with the relationship between 'a' and 'b' satisfying ab ≥ 1 mm. By making the width of the isolator 5 at least 1 mm greater than the width of the busbar 2, the busbar 2 can be entirely located within the area of ​​the isolator 5 during installation. This achieves better insulation and buffering effects, reduces the possibility of unnecessary contact between the busbar 2 and other components, and thus reduces the likelihood of short circuits, improving the quality of the photovoltaic module and better meeting actual usage requirements.

[0082] In one possible implementation, the width of the isolator 5 is 4 mm to 20 mm, and the thickness is 0.05 mm to 5 mm. The width and thickness of the isolator 5 can be selected according to actual needs; the width of the isolator 5 can be 4 mm, 6 mm, 8 mm, 10 mm, 12 mm, 14 mm, 16 mm, 18 mm, 20 mm, etc. The thickness of the isolator 5 can be 0.05 mm, 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm, 4.5 mm, 5 mm, etc. The length of the isolator 5 can be set according to the length of the busbar 2; it can be the same as the length of the busbar 2, or slightly longer. Typically, it can be about 0.5 mm or more longer than the length of the busbar 2, for example, it can be 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, etc., longer than the busbar 2. This design reduces the relative positional accuracy requirements between the busbar 2 and the isolator 5, provides a certain margin of error, and makes it easier to place the busbar 2 within the range of the isolator 5, which is beneficial to improving the insulation and buffering effect of the isolator 5.

[0083] In one possible implementation, the busbar 2 has a width of 3 mm to 15 mm and a thickness of 0.1 mm to 0.4 mm. The width and thickness of the busbar 2 can be selected according to actual needs. The width of the busbar 2 can be 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, etc. The thickness of the busbar 2 can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, etc. The length of the busbar 2 is affected by factors such as the size of the battery cells 1 in the battery string and the distance between adjacent battery strings; a suitable length can be selected according to actual needs.

[0084] In one possible implementation, the projection of the busbar 2 is located within the projection range of the isolator 5 in the projection along the thickness direction Z of the photovoltaic module.

[0085] This design enhances the insulation and buffering effect of the insulating component 5.

[0086] like Figure 9As shown, in one possible implementation, along the length direction X of the photovoltaic module, there is a spacing L2 between the busbar 2 and the edge of the battery string, where 0.1 mm ≤ L2 ≤ 3 mm. Specifically, the spacing between the busbar 2 and the edge of the battery string can be 0.1 mm, 0.3 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2.1 mm, 2.3 mm, 2.5 mm, 2.7 mm, 2.9 mm, 3.0 mm, etc.

[0087] This design allows for a certain margin between the busbar 2 and the edge of the battery string, improving fault tolerance and reducing the relative positional accuracy requirements between them. When the distance between the busbar 2 and the edge of the battery string is less than 0.1 mm, errors can easily occur during production, causing the position of the busbar 2 and the battery string to shift. This can cause the busbar 2 to extend beyond the battery string's range, occupying space along the length (X) of the photovoltaic module and affecting the arrangement of the battery cells 1. When the distance between the busbar 2 and the edge of the battery string is greater than 3 mm, the distance between the busbar 2 and the center of the photovoltaic module is too large, requiring a larger solder strip 3. This not only increases costs but also increases the risk of unnecessary contact between the solder strip 3 and other components, increasing the risk of short circuits and affecting the quality of the battery cells 1.

[0088] This application provides a photovoltaic module, which includes a cell string, a busbar 2, and at least one solder strip 3 for connecting the busbar 2 and the cell string to the cell cells 1. Along the thickness direction Z of the photovoltaic module, the busbar 2 is located on the side where the back of the cell cells 1 is located, and at least a portion of the projection of the busbar 2 along the thickness direction Z of the photovoltaic module lies within the projection range of the cell string. The solder strip 3 includes a connecting section 31 and a bent section 32. The connecting section 31 is connected to the cell cells 1, and the bent section 32 bends towards the back of the cell cells 1 and connects to the busbar 2. The extending direction of the bent section 32 is not parallel to the extending direction of the connecting section 31. This design allows the busbar 2 to be positioned on the back side of the cell cells 1, reducing the space occupied by the busbar 2 in the length direction X of the photovoltaic module, thereby increasing the area ratio of the cell cells 1 and ultimately improving the efficiency of the photovoltaic module.

[0089] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A photovoltaic module, characterized in that, The photovoltaic module includes: A battery string, the battery string comprising battery cells (1); Busbar (2); At least one solder strip (3) is used to connect the battery cell (1) and the busbar (2); Wherein, along the thickness direction of the photovoltaic module, the busbar (2) is located on the side where the back of the cell (1) is located, and in the projection along the thickness direction of the photovoltaic module, at least part of the projection of the busbar (2) is located within the projection range of the cell string, the solder strip (3) includes a connecting section (31) and a bending section (32) connected to each other, the connecting section (31) is connected to the cell (1), the bending section (32) bends toward the side where the back of the cell (1) is located and connects to the busbar (2), and the extension direction of the bending section (32) is not parallel to the extension direction of the connecting section (31); The busbar (2) is the busbar (2) located at both ends of the photovoltaic module, that is, the head and tail busbar.

2. The photovoltaic module according to claim 1, characterized in that, The extension direction of the bent segment (32) and the extension direction of the connecting segment (31) have an angle between them, the angle ranging from 5° to 25°.

3. The photovoltaic module according to claim 1, characterized in that, The solar cell (1) includes multiple solder points (4). Along the length of the photovoltaic module, the solder point (4) closest to the busbar (2) is the first solder point (41). The connecting section (31) and the bending section (32) are located on opposite sides of the first solder point (41). The bending segment (32) includes a first bending segment (321) and a second bending segment (322) that are connected to each other. The first bending segment (321) is connected to the connecting segment (31), and the second bending segment (322) is connected to the busbar (2).

4. The photovoltaic module according to claim 3, characterized in that, The connecting segment (31) and the second bending segment (322) of the same welding strip (3) are located on the same side of the battery string, or the connecting segment (31) and the second bending segment (322) of the same welding strip (3) are located on different sides of the battery string.

5. The photovoltaic module according to claim 3, characterized in that, Along the thickness direction of the photovoltaic module, the second bending segment (322) is located on the side of the busbar (2) facing the battery string, or along the thickness direction of the photovoltaic module, the second bending segment (322) is located on the side of the busbar (2) away from the battery string.

6. The photovoltaic module according to claim 1, characterized in that, Along the length of the photovoltaic module, at least a portion of the bent section (32) extends beyond the edge of the battery string by a distance L1, which ranges from 0.1 mm to 2 mm.

7. The photovoltaic module according to any one of claims 1 to 6, characterized in that, Along the length of the photovoltaic module, the busbar (2) does not extend beyond the edge of the battery string.

8. The photovoltaic module according to any one of claims 1 to 6, characterized in that, The photovoltaic module also includes an isolation element (5), which is located between the busbar (2) and the solar cell (1) along the thickness direction of the photovoltaic module.

9. The photovoltaic module according to claim 8, characterized in that, The isolation component (5) includes an insulating part (51) and a buffer part (52), which are arranged sequentially along the thickness direction of the photovoltaic module.

10. The photovoltaic module according to claim 9, characterized in that, Along the thickness direction of the photovoltaic module, the insulating part (51) is located on the side of the buffer part (52) facing the busbar (2).

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