Photovoltaic module

Abstract

The embodiment of the invention provides a photovoltaic module, and relates to the technical field of photovoltaic power generation. The photovoltaic module comprises a solar cell string, a welding strip and an insulating strip. The solar cell strings comprise a first solar cell string and a second solar cell string which are adjacent, the insulating strip comprises a first edge and a second edge which are oppositely arranged, the first edge is located on one side of the backlight surface of the first solar cell string, and the second edge is located on one side of the backlight surface of the second solar cell string. The welding strip comprises a first welding strip and a second welding strip, the first welding strip is connected with the first solar cell string, and the second welding strip is connected with the second solar cell string. In the first direction, the insulating strip is arranged between the first welding strip and the second welding strip, or the insulating strip covers the first welding strip and the second welding strip, in the first direction, the value range of the distance between the first welding strip and the first edge is 4-10 mm, and the value range of the distance between the second welding strip and the second edge is 4-10 mm. According to the embodiment of the invention, the risk of welding strip breakage can be reduced.

Description

Technical Field

[0001] The embodiments of this application relate to the technical field of photovoltaic power generation, and more particularly to a photovoltaic module. Background Technology

[0002] A photovoltaic module may include solar cells, solder ribbons, and insulating strips. There are multiple solar cells, with at least a portion of the solder ribbons disposed on the side of the solar cells facing away from the light source; multiple solar cells are connected in series via the solder ribbons. Insulating strips are disposed on the side of the solar cells facing away from the light source.

[0003] During the use of photovoltaic modules, the thermal expansion and contraction of the insulation strip can easily cause the solder strip to break, affecting the reliability of the photovoltaic modules. Summary of the Invention

[0004] The embodiments of this application provide a photovoltaic module that can reduce the risk of solder ribbon breakage and improve the reliability of photovoltaic modules.

[0005] On one hand, embodiments of this application provide a photovoltaic module. The photovoltaic module includes solar cell strings, solder ribbons, and insulating strips. Multiple solar cell strings are spaced apart along a first direction, each solar cell string including multiple solar cells. The multiple solar cells are arranged along a second direction, perpendicular to the first direction. Solder ribbons extend along the second direction, at least a portion of which is disposed on the side of the solar cell's backlight surface and connects two adjacent solar cells arranged along the second direction. Insulating strips extend along the second direction and are disposed on the side of the solar cell's backlight surface. The two adjacent solar cell strings along the first direction include a first solar cell string and a second solar cell string. The insulating strip includes a first edge and a second edge disposed opposite each other along the first direction. The first edge is located on the side of the solar cell in the first solar cell string where the backlight surface is located, and the second edge is located on the side of the solar cell in the second solar cell string where the backlight surface is located. The solder strip includes a first solder strip and a second solder strip. The first solder strip is connected to the solar cells in the first solar cell string, and the first solder strip is located on the edge region of the first solar cell string near the second solar cell string. The second solder strip is connected to the solar cells in the second solar cell string, and the second solder strip is located on the edge region of the second solar cell string near the first solar cell string. An insulating strip is disposed between the first solder strip and the second solder strip along a first direction, or the insulating strip covers the first solder strip and the second solder strip. Along the first direction, the distance between the side of the first solder strip near the first edge and the first edge is a first distance, with a value ranging from 4 mm to 10 mm. The distance between the side of the second solder strip near the second edge and the second edge is a second distance, with a value ranging from 4 mm to 10 mm.

[0006] In some possible implementations, when the insulating strip covers the first and second solder strips, there are multiple first solder strips, which are spaced apart along a first direction. The first distance is the distance between the side of the first solder strip adjacent to the first edge and the first edge. Similarly, there are multiple second solder strips, which are spaced apart along the first direction. The second distance is the distance between the side of the second solder strip adjacent to the second edge and the second edge.

[0007] In some possible implementations, when the insulating strip covers the first and second solder strips, the solder strips also include a third and a fourth solder strip. Along the first direction, the third solder strip is located on the side of the first edge away from the second edge, and the distance between the side of the third solder strip closest to the first edge and the first edge is a third distance, ranging from 1 mm to 10 mm. Along the first direction, the fourth solder strip is located on the side of the second edge away from the first edge, and the distance between the side of the fourth solder strip closest to the second edge and the second edge is a fourth distance, ranging from 1 mm to 10 mm.

[0008] In some possible implementations, when the insulating strip covers the first and second solder strips, the first distance ranges from 6 mm to 10 mm, and the second distance ranges from 6 mm to 10 mm.

[0009] In some possible implementations, when the insulating strip is disposed between the first and second solder strips, along the first direction, the distance between the side of the first solder strip closest to the first edge and the first edge is a fifth distance, the value of which ranges from 1 mm to 10 mm. Along the first direction, the distance between the side of the second solder strip closest to the second edge and the second edge is a sixth distance, the value of which ranges from 1 mm to 10 mm.

[0010] In some possible implementations, the width of the insulating strip along the first direction ranges from 10 mm to 35 mm.

[0011] In some possible implementations, the photovoltaic module also includes a first busbar disposed on the side of the insulating strip away from the solar cell, and the first busbar is connected to the solar cell.

[0012] In some possible implementations, the insulating strip includes an insulating layer, a first buffer layer, and a second buffer layer. The first buffer layer is stacked along the thickness direction of the insulating layer on the side of the insulating layer closest to the solar cell. The second buffer layer is stacked along the thickness direction of the insulating layer on the side of the insulating layer furthest from the first buffer layer.

[0013] In some possible implementations, the solar cell has a positive electrode pad on its light-receiving side and a negative electrode pad on its back side, or the solar cell has both a positive electrode pad and a negative electrode pad on its back side.

[0014] In some possible implementations, the plurality of solar cells includes a first solar cell and a second solar cell arranged adjacent to each other along a second direction. The first solar cell and the second solar cell are spaced apart, or, along the second direction, the light-receiving surface of the first solar cell and the back-lighting surface of the second solar cell partially overlap.

[0015] In summary, the embodiments of this application have at least the following beneficial effects: In the embodiments of this application, the insulating strip is located between the first welding strip and the second welding strip, which can reduce the mutual influence between the insulating strip and the welding strip (including the first welding strip and the second welding strip), thereby reducing the impact of thermal expansion and contraction of the insulating strip on the welding strip and reducing the risk of welding strip breakage caused by thermal expansion and contraction of the insulating strip.

[0016] In addition, the insulating strip is located between the first and second solder strips, which can reduce the impact of the solder strips on the insulating strip, increase the bonding area between the insulating strip and the backlight, reduce the deformation of the insulating strip due to thermal expansion and contraction, and reduce the risk of the grid lines on the backlight caused by thermal expansion and contraction of the insulating strip.

[0017] In addition, the insulating strip can cover both the first and second weld strips. In this case, the value range of the first distance is set to 4mm~10mm, which can avoid the distance between the side of the first weld strip close to the first edge and the first edge being too small (e.g., less than 4mm), which helps to reduce the shear force on the first weld strip when the insulating strip expands and contracts with temperature, and reduces the risk of damage to the first weld strip caused by the thermal expansion and contraction of the insulating strip.

[0018] In addition, setting the first distance to a range of 4mm to 10mm can also prevent the distance between the side of the first solder strip closest to the first edge and the first edge from being too large (e.g., greater than 10mm), which helps to reduce the shading caused by the insulating strip on the back surface of the solar cell.

[0019] Setting the value of the second distance to a range of 4mm to 10mm can prevent the distance between the side of the second welding strip closest to the second edge and the second edge from being too small (e.g., less than 4mm). This helps to reduce the shear force on the second welding strip when the insulating strip expands and contracts with heat, and reduces the risk of damage to the second welding strip caused by the thermal expansion and contraction of the insulating strip.

[0020] In addition, setting the value of the second distance to a range of 4mm to 10mm can also prevent the distance between the side of the second solder strip closest to the second edge and the second edge from being too large (e.g., greater than 10mm), which helps to reduce the shading caused by the insulating strip on the back surface of the solar cell. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in 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 This is a schematic diagram of the structure of a photovoltaic module provided in some embodiments of this application; Figure 2 A schematic diagram showing the positional relationship between the first solar cell and the second solar cell provided in some embodiments of this application; Figure 3 A schematic diagram showing the positional relationship between the first solar cell and the second solar cell provided in other embodiments of this application; Figure 4 A schematic diagram showing the positional relationship of insulating strips, solar cell strings, and solder strips provided in some embodiments of this application; Figure 5 A schematic diagram showing the positional relationship of the insulating strip, solar cell string, and solder strip provided for other embodiments of this application; Figure 6 A schematic diagram showing the positional relationship of the insulating strip, solar cell string, and solder strip provided in some embodiments of this application; Figure 7 This application provides schematic diagrams of the structure of insulating strips in some embodiments. Figure 8 Equivalent circuit diagrams of photovoltaic modules provided in some embodiments of this application; Figure 9 This is a schematic diagram showing the positional relationship of the solar cell, encapsulant film, glass cover, insulating strip, and first busbar provided in some embodiments of this application.

[0023] Explanation of reference numerals in the attached figures: 200 - Photovoltaic module, 210 - Solar cell string, 210a - First solar cell string group, 210b - Second solar cell string group, 211 - First solar cell string, 212 - Second solar cell string, 2101 - First sub-string, 2102 - Second sub-string, 2103 - Third sub-string, 2104 - Fourth sub-string, 213 - Connector string, 214 - Solar cell, 2141 - First solar cell, 2142 - Second solar cell, 220 - Solder ribbon, 221 - First solder ribbon, 222 - Second solder ribbon, 223 - Third solder ribbon, 224 - Fourth solder ribbon, 231 - Insulating strip, 2311 - First buffer layer, 2312 - Second buffer layer, 2313 - Insulating layer, 241 - First busbar, 241 1-First busbar, 2412-Second busbar, 242-Second busbar, 251-First glass cover, 252-Second glass cover, 261-First junction box, 262-Second junction box, 263-Third junction box, 271-First adhesive film, 272-Second adhesive film, Q1-Light-receiving surface, Q2-Backlight-receiving surface, L1-First edge, L2-Second edge, M1-First generator, M2-Second generator, M3-Third generator, D1-First diode, D2-Second diode, D3-Third diode, H1-First distance, H2-Second distance, H3-Third distance, H4-Fourth distance, H5-Fifth distance, H6-Sixth distance, X-First direction, Y-Second direction. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] In this application, the terms "upper," "left," "right," "front," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0026] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0027] Furthermore, the terms "installation," "setup," "equipped with," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or a link; they can refer to a direct connection or an indirect connection via an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0028] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0029] Photovoltaic modules can convert light energy (such as solar energy) into electrical energy, thereby realizing photovoltaic power generation. With the continuous development of the photovoltaic industry, the packaging form of photovoltaic modules is gradually upgrading from traditional whole-cell packaging to two-cell, three-cell, four-cell, and even any number of multi-cell packaging.

[0030] Taking a three-cell package as an example, after the solar cells are manufactured, they are cut into three independent small cells. Several independent small cells cut from multiple solar cells can be connected in series to form a cell string, and then multiple cell strings can be connected to form a cell string assembly. After subsequent processes such as lamination, they can be made into photovoltaic modules.

[0031] This segmented packaging design reduces thermal resistance loss, enabling photovoltaic modules to achieve higher power generation and better heat resistance.

[0032] Figure 1 The diagram shows the structure of a photovoltaic module provided in some embodiments of this application. Figure 1 As shown, an embodiment of this application provides a photovoltaic module 200, which can be a sectionally packaged photovoltaic module.

[0033] In some examples, such as Figure 1 As shown, the photovoltaic module 200 may include multiple solar cell strings 210, which are spaced apart along a first direction X.

[0034] For example, the number of solar cell strings 210 is an even number. For instance, the number of solar cell strings 210 can be four, six, or eight, etc. The embodiments of this application do not further limit the number of solar cell strings 210.

[0035] Continue to refer to Figure 1In some examples, any solar cell string 210 includes a plurality of solar cells 214 arranged along a second direction Y, which is perpendicular to the first direction X.

[0036] For example, a solar cell string 210 may include 10, 20, 30, or more solar cells 214, and the number of solar cells 214 in different solar cell strings 210 may be the same. The embodiments of this application do not further limit the number of solar cells 214 in the solar cell string 210.

[0037] The second direction Y and the first direction X can be perpendicular or approximately perpendicular. That is, the angle between the second direction Y and the first direction X can be 90°, 88°, or 89°, etc.

[0038] Figure 2 This is a schematic diagram showing the positional relationship between the first solar cell and the second solar cell, provided for some embodiments of this application. Figure 3 A schematic diagram showing the positional relationship between the first solar cell and the second solar cell provided for other embodiments of this application.

[0039] like Figure 2 and Figure 3 As shown, the solar cell 214 may include a light-receiving surface Q1 and a back-lighting surface Q2 disposed opposite to each other along the thickness direction Z of the solar cell 214. Understandably, the light-receiving surface Q1 is used to receive light, and the back-lighting surface Q2 is away from the light.

[0040] For example, both the light-receiving surface Q1 and the back-lighting surface Q2 of the solar cell 214 may be provided with grid lines, or the back-lighting surface Q2 of the solar cell 214 may be provided with grid lines. Understandably, the grid lines are used to collect current.

[0041] In some examples, the light-receiving surface Q1 of the solar cell 214 is provided with a positive electrode pad, and the back-lighting surface Q2 of the solar cell 214 is provided with a negative electrode pad, or the back-lighting surface Q2 of the solar cell 214 is provided with both a positive electrode pad and a negative electrode pad.

[0042] For example, a solar cell with a positive electrode pad on the light-receiving surface Q1 and a negative electrode pad on the back surface Q2 can be called a tunnel oxide passivating contact (TOPCON) solar cell, and a solar cell with both a positive electrode pad and a negative electrode pad on the back surface Q2 can be called a back contact solar cell.

[0043] The positive electrode pad is set on the light-receiving surface Q1 of the solar cell 214, and the negative electrode pad is set on the back surface Q2 of the solar cell 214. Alternatively, both the positive electrode pad and the negative electrode pad are set on the back surface Q2 of the solar cell 214, which can improve the flexibility of the pad setting and meet different needs.

[0044] Continue to refer to Figure 1 In some examples, the solder ribbon 220 extends along the second direction Y, at least a portion of the solder ribbon 220 is disposed on the side where the back surface Q2 of the solar cell 214 is located, and the solder ribbon 220 connects two solar cells 214 disposed adjacently along the second direction Y.

[0045] For example, the solder ribbon 220 can connect the positive pad of one solar cell 214 and the negative pad of another solar cell 214, so that two solar cells 214 arranged adjacent to each other along the second direction Y can be connected in series through the solder ribbon 220.

[0046] Understandably, there can be multiple solder ribbons 220. Multiple solder ribbons 220 can connect two solar cells 214 that are arbitrarily adjacent along the second direction Y, so that multiple solar cells 214 in the solar cell string 210 can be connected in series through multiple solder ribbons 220.

[0047] For example, such as Figure 1 As shown, two adjacent solar cells 214 arranged along the second direction Y can be connected by multiple solder strips 220, and the multiple solder strips 220 connecting the two adjacent solar cells 214 can be spaced apart along the first direction X.

[0048] In some examples, such as Figure 2 and Figure 3 As shown, the plurality of solar cells 214 include a first solar cell 2141 and a second solar cell 2142 arranged adjacent to each other along the second direction Y.

[0049] The first solar cell 2141 and the second solar cell 2142 are arranged at intervals, or, along the second direction Y, the light-receiving surface Q1 of the first solar cell 2141 and the back-lighting surface Q2 of the second solar cell 2142 partially overlap.

[0050] Understandably, the first solar cell 2141 and the second solar cell 2142 are spaced apart along the second direction Y, which can reduce the mutual influence between the first solar cell 2141 and the second solar cell 2142.

[0051] Alternatively, along the second direction Y, the light-receiving surface Q1 of the first solar cell 2141 and the back-lighting surface Q2 of the second solar cell 2142 partially overlap, which can reduce the space occupied by the first solar cell 2141 and the second solar cell 2142 along the second direction Y, that is, reduce the space occupied by the solar cell string 210 along the second direction Y, which is beneficial to increase the area occupied by the solar cell 214 in the photovoltaic module 200, thereby increasing the power generation of the photovoltaic module 200.

[0052] Refer again Figure 1 In some examples, the photovoltaic module 200 also includes an insulating strip 231. The insulating strip 231 extends along the second direction Y and is disposed on the side where the back surface Q2 of the solar cell 214 is located. Understandably, the insulating strip 231 serves an insulating function.

[0053] In some examples, such as Figure 1 As shown, the photovoltaic module also includes a first busbar 241, which is disposed on the side of the insulating strip 231 away from the solar cell 214, and the first busbar is connected to the solar cell 214.

[0054] Understandably, the first busbar 241 serves to conduct electricity. The material of the first busbar 241 may include at least one of copper, silver, and aluminum, and the embodiments of this application do not further limit the material of the first busbar 241.

[0055] For example, the first busbar 241 can be electrically connected to the solar cell 214 via a wire or solder strip 220.

[0056] Understandably, the insulating strip 231 is set on the back surface Q2 of the solar cell 214, and the solder ribbon 220 is also set on the back surface Q2 of the solar cell 214. During the use of the photovoltaic module 200, the insulating strip 231 will expand and contract with temperature changes. This expansion and contraction can easily cause the solder ribbon 220 to break, affecting the reliability of the photovoltaic module 200.

[0057] Based on this, in the embodiments of this application, the impact of thermal expansion and contraction of the insulating strip 231 on the welding strip 220 can be reduced by the relative arrangement positions of the insulating strip 231 and the welding strip 220, which is beneficial to improving the reliability of the photovoltaic module 200.

[0058] Figure 4 This is a schematic diagram showing the positional relationship of the insulating strip, solar cell string, and solder strip provided in some embodiments of this application. Figure 5 This is a schematic diagram showing the positional relationship of the insulating strip, solar cell string, and solder strip provided for other embodiments of this application. Figure 6 This is a schematic diagram showing the positional relationship of the insulating strip, solar cell string, and solder strip provided in some embodiments of this application.

[0059] The following reference Figure 4 , Figure 5 and Figure 6 The relative positions of the insulating strip 231 and the solder strip 220 in the embodiments of this application are illustrated by example. It is understood that, for the sake of simplifying the diagram, Figure 4 , Figure 5 and Figure 6 Only a portion of the solar cells 214 and a portion of the solder strips 220 in the photovoltaic module 200 are shown.

[0060] Continue to refer to Figure 1 In some examples, two solar cell strings 210 arranged adjacent to each other along the first direction X include a first solar cell string 211 and a second solar cell string 212, such as... Figure 4 , Figure 5 and Figure 6 As shown, the insulating strip 231 includes a first edge L1 and a second edge L2 disposed opposite to each other along the first direction X. The first edge L1 is located on the side where the back surface Q2 of the solar cell 214 in the first solar cell string 211 is located, and the second edge L2 is located on the side where the back surface Q2 of the solar cell 214 in the second solar cell string 212 is located.

[0061] The first edge L1 is located on the side where the back surface Q2 of the solar cell 214 in the first solar cell string 211 is located, and the second edge L2 is located on the side where the back surface Q2 of the solar cell 214 in the second solar cell string 212 is located. That is, along the first direction X, the insulating strip 231 can cover a part of the first solar cell string 211 and the second solar cell string 212.

[0062] like Figure 4 , Figure 5 and Figure 6 As shown, the solder ribbon 220 includes a first solder ribbon 221 and a second solder ribbon 222. The first solder ribbon 221 is connected to the solar cells 214 in the first solar cell string 211, and the first solder ribbon 221 is located in the edge region of the first solar cell string 211 near the second solar cell string 212. The second solder ribbon 222 is connected to the solar cells 214 in the second solar cell string 212, and the second solder ribbon 222 is located in the edge region of the second solar cell string 212 near the first solar cell string 211.

[0063] Understandably, the edge region of the first solar cell string 211 near the second solar cell string 212 is the region where multiple solar cells 214 in the first solar cell string 211 are close to the second solar cell string 212. Similarly, the edge region of the second solar cell string 212 near the first solar cell string 211 is the region where multiple solar cells 214 in the second solar cell string 212 are close to the first solar cell string 211.

[0064] In some examples, such as Figure 4 As shown, along the first direction X, the insulating strip 231 is located between the first solder strip 221 and the second solder strip 222.

[0065] The insulating strip 231 is located between the first welding strip 221 and the second welding strip 222, which can reduce the mutual influence between the insulating strip 231 and the welding strip 220 (including the first welding strip 221 and the second welding strip 222), thereby reducing the impact of thermal expansion and contraction of the insulating strip 231 on the welding strip 220 and reducing the risk of the welding strip 220 breaking due to thermal expansion and contraction of the insulating strip 231.

[0066] In addition, the insulating strip 231 is located between the first solder strip 221 and the second solder strip 222, which can reduce the impact of the solder strip 220 on the insulating strip 231, increase the bonding area between the insulating strip 231 and the backlight surface Q2, reduce the deformation of the insulating strip 231 due to thermal expansion and contraction, and reduce the risk of the grid lines set on the backlight surface Q2 breaking due to thermal expansion and contraction of the insulating strip 231.

[0067] In other examples, such as Figure 5 and Figure 6 As shown, the insulating strip 231 covers the first solder strip 221 and the second solder strip 222.

[0068] Understandably, Figure 5 and Figure 6 The first solder strip 221 and the second solder strip 222 are shown in dashed lines. Along the second direction Y, the insulating strip 231 may cover a portion of the first solder strip 221, or it may completely cover the first solder strip 221. Along the second direction Y, the insulating strip 231 may cover a portion of the second solder strip 222, or it may completely cover the second solder strip 222.

[0069] Along the first direction X, the distance between the side of the first weld strip 221 closest to the first edge L1 and the first edge L1 is a first distance H1, and the value of the first distance H1 ranges from 4 mm to 10 mm. The distance between the side of the second weld strip 222 closest to the second edge L2 and the second edge L2 is a second distance H2, and the value of the second distance H2 ranges from 4 mm to 10 mm.

[0070] For example, the value of the first distance H1 can be 5mm, 6mm, 7mm or 8mm, etc., and the value of the second distance H2 can be 5mm, 6mm, 7mm or 8mm, etc. The values ​​of the first distance H1 and the second distance H2 can be equal or unequal. The embodiments of this application do not further limit the values ​​of the first distance H1 and the second distance H2.

[0071] Understandably, the smaller the first distance H1, the greater the shear force exerted by the thermal expansion and contraction of the insulating strip 231 on the first solder strip 221. Conversely, the larger the first distance H1, the smaller the shear force exerted by the thermal expansion and contraction of the insulating strip 231 on the first solder strip 221.

[0072] Similarly, the smaller the second distance H2, the greater the shear force exerted by the thermal expansion and contraction of the insulating strip 231 on the second solder strip 222. Conversely, the larger the second distance H2, the smaller the shear force exerted by the thermal expansion and contraction of the insulating strip 231 on the second solder strip 222.

[0073] In the embodiments of this application, the value range of the first distance H1 is set to 4mm~10mm, which can avoid the distance between the side of the first solder strip 221 close to the first edge L1 and the first edge L1 being too small (for example, less than 4mm), which helps to reduce the shear force on the first solder strip 221 when the insulating strip 231 expands and contracts with heat, and reduce the risk of the first solder strip 221 being damaged due to the thermal expansion and contraction of the insulating strip 231.

[0074] In addition, setting the value of the first distance H1 to be in the range of 4mm to 10mm can also avoid the distance between the side of the first solder strip 221 close to the first edge L1 and the first edge L1 being too large (for example, greater than 10mm), which is conducive to reducing the shading of the insulating strip 231 on the back surface Q2 of the solar cell 214.

[0075] Setting the value of the second distance H2 to a range of 4mm to 10mm can prevent the distance between the side of the second welding strip 222 close to the second edge L2 and the second edge L2 from being too small (e.g., less than 4mm). This helps to reduce the shear force on the second welding strip 222 caused by the thermal expansion and contraction of the insulating strip 231, and reduces the risk of damage to the second welding strip 222 caused by the thermal expansion and contraction of the insulating strip 231.

[0076] In addition, setting the value of the second distance H2 to a range of 4mm to 10mm can also prevent the distance between the side of the second welding strip 222 close to the second edge L2 and the second edge L2 from being too large (e.g., greater than 10mm), which is beneficial to reduce the shading caused by the insulating strip 231 on the back surface Q2 of the solar cell 214.

[0077] In some examples, such as Figure 6As shown, when the insulating strip 231 covers the first solder strip 221 and the second solder strip 222, there are multiple first solder strips 221. The multiple first solder strips 221 are spaced apart along the first direction X. The first distance H1 is the distance between the side of the first solder strip 221 that is adjacent to the first edge L1 and the first edge L1.

[0078] There are multiple second solder strips 222, which are spaced apart along the first direction X. The second distance H2 is the distance between the side of the second solder strip 222 that is adjacent to the second edge L2 and the second edge L2.

[0079] This configuration can reduce the impact of thermal expansion and contraction of the insulating strip 231 on the first solder strip 221 adjacent to the first edge L1 and the second solder strip 222 adjacent to the second edge L2, thereby improving the reliability of the photovoltaic module 200.

[0080] In some examples, when the insulating strip 231 covers the first solder strip 221 and the second solder strip 222, the first distance H1 ranges from 6 mm to 10 mm, and the second distance H2 ranges from 6 mm to 10 mm.

[0081] For example, the first distance H1 can be 7mm, 8mm or 9mm, etc., and the second distance H2 can be 7mm, 8mm or 9mm, etc.

[0082] Setting the value of the first distance H1 to a range of 6mm to 10mm can prevent the distance between the side of the first welding strip 221 close to the first edge L1 and the first edge L1 from being too small (e.g., less than 6mm). This helps to reduce the shear force on the first welding strip 221 caused by the thermal expansion and contraction of the insulating strip 231, and reduces the risk of damage to the first welding strip 221 caused by the thermal expansion and contraction of the insulating strip 231.

[0083] In addition, setting the value of the first distance H1 to be in the range of 6mm to 10mm can also avoid the distance between the side of the first solder strip 221 close to the first edge L1 and the first edge L1 being too large (for example, greater than 10mm), which is conducive to reducing the shading of the insulating strip 231 on the back surface Q2 of the solar cell 214.

[0084] Setting the value of the second distance H2 to a range of 6mm to 10mm can prevent the distance between the side of the second welding strip 222 close to the second edge L2 and the second edge L2 from being too small (e.g., less than 6mm). This helps to reduce the shear force on the second welding strip 222 caused by the thermal expansion and contraction of the insulating strip 231, and reduces the risk of damage to the second welding strip 222 caused by the thermal expansion and contraction of the insulating strip 231.

[0085] In addition, setting the value of the second distance H2 to a range of 6mm to 10mm can also prevent the distance between the side of the second welding strip 222 close to the second edge L2 and the second edge L2 from being too large (for example, greater than 10mm), which is beneficial to reduce the shading caused by the insulating strip 231 on the back surface Q2 of the solar cell 214.

[0086] In some examples, such as Figure 5 and Figure 6 As shown, when the insulating strip 231 covers the first solder strip 221 and the second solder strip 222, the solder strip 220 also includes a third solder strip 223 and a fourth solder strip 224.

[0087] Along the first direction X, the third weld strip 223 is located on the side of the first edge L1 away from the second edge L2. The distance between the side of the third weld strip 223 close to the first edge L1 and the first edge L1 is the third distance H3. The value of the third distance H3 ranges from 1 mm to 10 mm.

[0088] Along the first direction X, the fourth weld strip 224 is located on the side of the second edge L2 away from the first edge L1. The distance between the side of the fourth weld strip 224 close to the second edge L2 and the second edge L2 is the fourth distance H4. The value of the fourth distance H4 ranges from 1 mm to 10 mm.

[0089] For example, the value of the third distance H3 can be 2mm, 5mm, or 8mm, etc., and the value of the fourth distance H4 can be 2mm, 5mm, or 8mm, etc. The values ​​of the third distance H3 and the fourth distance H4 can be equal or unequal. The embodiments of this application do not further limit the values ​​of the third distance H3 and the fourth distance H4.

[0090] Setting the value of the third distance H3 to a range of 1mm to 10mm can prevent the distance between the insulating strip 231 and the third welding strip 223 from being too small (e.g., less than 1mm), and can reduce the impact of thermal expansion and contraction of the insulating strip 231 on the third welding strip 223.

[0091] In addition, setting the value of the third distance H3 to a range of 1mm to 10mm can also prevent the distance between the insulating strip 231 and the third welding strip 223 from being too large (for example, greater than 10mm), ensuring the width of the insulating strip 231 along the first direction X, which is beneficial to improving the insulation effect of the insulating strip 231.

[0092] Setting the value of the fourth distance H4 to a range of 1mm to 10mm can prevent the distance between the insulating strip 231 and the fourth welding strip 224 from being too small (e.g., less than 1mm), and can reduce the impact of thermal expansion and contraction of the insulating strip 231 on the fourth welding strip 224.

[0093] In addition, setting the value of the fourth distance H4 to a range of 1mm to 10mm can also prevent the distance between the insulating strip 231 and the fourth welding strip 224 from being too large (for example, greater than 10mm), ensuring the width of the insulating strip 231 along the first direction X, which is beneficial to improving the insulation effect of the insulating strip 231.

[0094] In some examples, such as Figure 4 As shown, when the insulating strip 231 is disposed between the first solder strip 221 and the second solder strip 222, along the first direction X, the distance between the side of the first solder strip 221 near the first edge L1 and the first edge L1 is a fifth distance H5, and the value of the fifth distance H5 ranges from 1 mm to 10 mm. Along the first direction X, the distance between the side of the second solder strip 222 near the second edge L2 and the second edge L2 is a sixth distance H6, and the value of the sixth distance H6 ranges from 1 mm to 10 mm.

[0095] Setting the value of the fifth distance H5 to a range of 1mm to 10mm can prevent the distance between the insulating strip 231 and the first welding strip 221 from being too small (e.g., less than 1mm), and can reduce the impact of thermal expansion and contraction of the insulating strip 231 on the first welding strip 221.

[0096] In addition, setting the value of the fifth distance H5 to a range of 1mm to 10mm can also prevent the distance between the insulating strip 231 and the first welding strip 221 from being too large (for example, greater than 10mm), ensuring the width of the insulating strip 231 along the first direction X, which is beneficial to improving the insulation effect of the insulating strip 231.

[0097] Setting the value of the sixth distance H6 to a range of 1mm to 10mm can prevent the distance between the insulating strip 231 and the second welding strip 222 from being too small (e.g., less than 1mm), and can reduce the impact of thermal expansion and contraction of the insulating strip 231 on the second welding strip 222.

[0098] In addition, setting the value of the sixth distance H6 to a range of 1mm to 10mm can also prevent the distance between the insulating strip 231 and the second welding strip 222 from being too large (for example, greater than 10mm), ensuring the width of the insulating strip 231 along the first direction X, which is beneficial to improving the insulation effect of the insulating strip 231.

[0099] In some examples, the width of the insulating strip 231 along the first direction X ranges from 10 mm to 35 mm.

[0100] For example, the width of the insulating strip 231 along the first direction X can be 15mm, 20mm, 25mm or 30mm, etc. The embodiments of this application do not further limit the value of the insulating strip 231 along the first direction X.

[0101] Understandably, setting the width of the insulating strip 231 along the first direction X to a range of 10mm to 35mm avoids the insulating strip 231 being too small (e.g., less than 10mm), ensuring the insulating effect of the insulating strip 231 on the first busbar 241 and the solar cell 214. Furthermore, setting the width of the insulating strip 231 along the first direction X to a range of 10mm to 35mm also avoids the insulating strip 231 being too large (e.g., greater than 35mm), reducing the shading caused by the insulating strip 231 on the back surface Q2 of the solar cell 214.

[0102] In some examples, the insulating strip 231 includes a transparent material. See again... Figure 1 Along the first direction X, at least a portion of the first busbar 241 is located between the first solar cell string 211 and the second solar cell string 212.

[0103] This configuration allows light illuminating the space between the first solar cell string 211 and the second solar cell string 212 to be reflected by the first busbar 241 to the light-receiving surface Q1 of the solar cell 214, reducing the light leakage of the photovoltaic module 200 and improving the output power of the photovoltaic module 200.

[0104] For example, the first busbar 241 may include a busbar body and a reflective layer. The busbar body is used to conduct electricity, and the reflective layer is disposed on the surface of the busbar body to reflect light, so as to improve the intensity of the light reflected by the first busbar 241, thereby increasing the output power of the photovoltaic module 200.

[0105] Figure 7 This is a schematic diagram of the structure of an insulating strip provided in some embodiments of this application. In some examples, such as... Figure 7 As shown, the insulating strip 231 includes an insulating layer 2313, a first buffer layer 2311, and a second buffer layer 2312.

[0106] The first buffer layer 2311 is stacked along the thickness direction of the insulating layer 2313 on the side of the insulating layer 2313 closest to the solar cell 214. The second buffer layer 2312 is stacked along the thickness direction of the insulating layer 2313 on the side of the insulating layer 2313 away from the first buffer layer 2311.

[0107] Understandably, the insulating layer 2313 includes insulating material, enabling the insulating strip 231 to electrically isolate the first busbar 241 and the solar cell 214.

[0108] The material of the insulating layer 2313 may include polyethylene terephthalate (PET). Alternatively, the insulating layer 2313 may also include other insulating materials. The embodiments of this application do not further limit the material of the insulating layer 2313.

[0109] The material of the buffer layer (including the first buffer layer 2311 and the second buffer layer 2312) may include ethylene vinyl acetate (EVA), or the buffer layer may also include other materials. The embodiments of this application do not further limit the material of the first buffer layer 2311.

[0110] Understandably, the thickness direction of the insulating layer 2313 and the thickness direction Z of the solar cell 214 are in the same direction. The first buffer layer 2311 is stacked along the thickness direction of the insulating layer 2313 on the side of the insulating layer 2313 close to the solar cell 214, so that the first buffer layer 2311 can absorb the compressive force of the first busbar 241 and the insulating layer 2313 on the solar cell 214, play a buffering role, and reduce the risk of the solar cell 214 breaking.

[0111] The second buffer layer 2312 is stacked along the thickness direction of the insulating layer 2313 on the side of the insulating layer 2313 away from the first buffer layer 2311, so that the second buffer layer 2312 can absorb the squeezing force of the first busbar 241 and other components on the solar cell 214, play a buffering role, and reduce the risk of the solar cell 214 breaking.

[0112] For example, such as Figure 7 As shown, the thickness of the first buffer layer 2311 can be greater than the thickness of the second buffer layer 2312. Alternatively, the thickness of the first buffer layer 2311 and the thickness of the second buffer layer 2312 can be equal. The embodiments of this application do not further limit the relationship between the thicknesses of the first buffer layer 2311 and the second buffer layer 2312, nor the specific values ​​of the thicknesses of the first buffer layer 2311 and the second buffer layer 2312.

[0113] The connection relationship of the solar cells 214 in the photovoltaic module 200 is illustrated below.

[0114] Refer again Figure 1In some examples, multiple solar cell strings 210 can form a first solar cell string group 210a and a second solar cell string group 210b. The first solar cell string group 210a includes multiple solar cell strings 210, and the second solar cell string group 210b includes multiple solar cell strings 210. It is understood that both the first solar cell string group 210a and the second solar cell string group 210b can include a first solar cell string 211 and a second solar cell string 212.

[0115] Understandably, the number of solar cell strings 210 in the first solar cell string group 210a and the number of solar cell strings 210 in the second solar cell string group 210b may be equal or unequal. The embodiments of this application do not further limit the number of solar cell strings 210 in the first solar cell string group 210a and the second solar cell string group 210b.

[0116] In the first solar cell string group 210a, any solar cell string 210 includes a first substring 2101 and a second substring 2102 arranged along the second direction Y, and the first substring 2101 and the second substring 2102 are connected in series. In the second solar cell string group 210b, any solar cell string 210 includes a third substring 2103 and a fourth substring 2104 arranged along the second direction Y, and the third substring 2103 and the fourth substring 2104 are connected in series.

[0117] Understandably, the first substring 2101 includes multiple solar cells 214 connected in series, and the second substring 2102 includes multiple solar cells 214 connected in series. The number of solar cells 214 in the first substring 2101 and the number of solar cells 214 in the second substring 2102 may be equal or unequal.

[0118] The third substring 2103 includes multiple solar cells 214 connected in series, and the fourth substring 2104 includes multiple solar cells 214 connected in series. The number of solar cells 214 in the third substring 2103 and the number of solar cells 214 in the fourth substring 2104 may be equal or unequal.

[0119] The embodiments of this application do not further limit the number of solar cells 214 in the first substring 2101, the second substring 2102, the third substring 2103, and the fourth substring 2104.

[0120] Figure 8 Equivalent circuit diagrams of photovoltaic modules provided for some embodiments of this application.

[0121] In some examples, such as Figure 8As shown, multiple first substrings 2101 in the first solar cell string group 210a are connected in parallel to form a first power generation unit M1. Multiple third substrings 2103 in the second solar cell string group 210b are connected in parallel to form a second power generation unit M2. Second substrings 2102 and fourth substrings 2104 are connected in series to form a connecting string 213, and multiple connecting strings 213 are connected in series to form a third power generation unit M3.

[0122] The first power generation unit M1, the third power generation unit M3, and the second power generation unit M2 are connected in series, that is, as Figure 8 As shown, the positive terminal of the first power generation unit M1 is connected to the negative terminal of the third power generation unit M3, and the positive terminal of the third power generation unit M3 is connected to the negative terminal of the second power generation unit M2. Understandably, the negative terminal of the first power generation unit M1 is the positive terminal of the photovoltaic module 200, and the positive terminal of the second power generation unit M2 is the positive terminal of the photovoltaic module 200.

[0123] The first busbar 241 includes a first busbar 2411 and a second busbar 2412. The first busbar 2411 is connected to the positive terminal and the negative terminal of the first power generation unit M1, and the second busbar 2412 is connected to the positive terminal and the negative terminal of the second power generation unit M2.

[0124] There are two insulating strips 231. One of the two insulating strips 231 is disposed between the first first busbar 2411 and the solar cell 214, and the other is disposed between the second first busbar 2412 and the solar cell 214.

[0125] Understandably, the two insulating strips 231 can electrically isolate the first first busbar 2411 and the second first busbar 2412 from the solar cell 214, respectively.

[0126] The photovoltaic module 200 also includes a first diode D1 and a second diode D2. The anode of the first diode D1 is connected to the negative terminal of the first power generation unit M1 through the first first busbar 2411, and the cathode of the first diode D1 is connected to the positive terminal of the first power generation unit M1 through the first first busbar 2411.

[0127] The anode of the second diode D2 is connected to the negative terminal of the second first busbar 2412 and the second power generation unit M2, and the cathode of the second diode D2 is connected to the positive terminal of the second first busbar 2412 and the second power generation unit M2.

[0128] Continue to refer to Figure 8The photovoltaic module 200 may further include a second busbar 242 and a third diode D3. The second busbar 242 extends along a first direction X and is disposed on the side where the back surface Q2 of the solar cell 214 is located. The second busbar 242 connects the positive terminal and the negative terminal of the third power generation unit M3.

[0129] The anode of the third diode D3 is connected to the cathode of the third power generation unit M3 through the second busbar 242, and the cathode of the third diode D3 is connected to the cathode of the third power generation unit M3 through the second busbar 242.

[0130] Understandably, when the first power generation unit M1 malfunctions (e.g., when it is blocked by a foreign object), the first busbar 2411 and the first diode D1 can bypass the first power generation unit M1. When the second power generation unit M2 malfunctions (e.g., when it is blocked by a foreign object), the second busbar 2412 and the second diode D2 can bypass the second power generation unit M2. When the third power generation unit M3 malfunctions, the second busbar 242 and the third diode D3 can bypass the third power generation unit M3.

[0131] In this way, on the one hand, the risk of damage to the photovoltaic module 200 is reduced, which helps to improve the reliability of the photovoltaic module 200. On the other hand, the first busbar 241 and the second busbar 242 can bypass the abnormal part of the photovoltaic module 200, while the other parts can work normally, reducing the impact of the abnormality of some solar cells 214 in the photovoltaic module 200 on other solar cells 214.

[0132] For example, such as Figure 1 As shown, the photovoltaic module 200 also includes a first junction box 261, a second junction box 262, and a third junction box 263.

[0133] The location of the first junction box 261 can correspond to the location of the first busbar 2411, the location of the second junction box 262 can correspond to the location of the second busbar 2412, and the location of the third junction box 263 can correspond to the location of the second busbar 242.

[0134] The first diode D1 can be disposed in the first junction box 261 and connected to the first bus bar 2411; the second diode D2 can be disposed in the second junction box 262 and connected to the second bus bar 2412; and the third diode D3 can be disposed in the third junction box 263 and connected to the second bus bar 242.

[0135] It is understood that the solar cells 214 in the photovoltaic module 200 may also have other connection relationships besides those described above, and the embodiments of this application do not further limit this.

[0136] Figure 9 This is a schematic diagram showing the positional relationship of the solar cell, encapsulant film, glass cover, insulating strip, and first busbar according to some embodiments of this application. It is understood that, for the sake of simplifying the structure of the drawings, Figure 9 Solder strip 220 is not shown in the image.

[0137] For example, such as Figure 9 As shown, the photovoltaic module 200 may also include a first glass cover plate 251, a second glass cover plate 252, a first encapsulant film 271, and a second encapsulant film 272.

[0138] The first glass cover plate 251 can be bonded to the side of the solar cell 214 where the back surface Q2 is located through the first adhesive film 271, and the second glass cover plate 252 can be bonded to the side of the solar cell 214 where the light-receiving surface Q1 is located through the second adhesive film 272.

[0139] Understandably, the first glass cover 251 and the second glass cover 252 can protect the solar cell 214.

[0140] The material of the first adhesive film 271 may include at least one of ethylene vinyl acetate copolymer (EVA) and polyolefin elastomer (POE). The material of the second adhesive film 272 may include at least one of ethylene vinyl acetate copolymer (EVA) and polyolefin elastomer (POE).

[0141] Understandably, the materials of the first adhesive film 271 and the second adhesive film 272 may be the same or different. The embodiments of this application do not further limit the materials of the first adhesive film 271 and the second adhesive film 272.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A photovoltaic module, characterized in that, include: A solar cell string, wherein the number of solar cell strings is multiple, the multiple solar cell strings are spaced apart along a first direction, each solar cell string includes multiple solar cells, the multiple solar cells are arranged along a second direction, the second direction being perpendicular to the first direction; A solder strip extends along the second direction, at least a portion of which is disposed on one side of the back surface of the solar cell and connects two solar cells disposed adjacent to each other along the second direction. as well as, An insulating strip extends along the second direction and is disposed on the side where the back surface of the solar cell is located; Wherein, the two solar cell strings arranged adjacent to each other along the first direction include a first solar cell string and a second solar cell string, and the insulating strip includes a first edge and a second edge arranged opposite to each other along the first direction, the first edge being located on the side where the back surface of the solar cell in the first solar cell string is located, and the second edge being located on the side where the back surface of the solar cell in the second solar cell string is located. The welding strip includes a first welding strip and a second welding strip. The first welding strip is connected to the solar cells in the first solar cell string, and the first welding strip is disposed in the edge region of the first solar cell string near the second solar cell string. The second welding strip is connected to the solar cells in the second solar cell string, and the second welding strip is disposed in the edge region of the second solar cell string near the first solar cell string. Along the first direction, the insulating strip is disposed between the first solder strip and the second solder strip; or, The insulating strip covers the first solder strip and the second solder strip. Along the first direction, the distance between the side of the first solder strip near the first edge and the first edge is the first distance, and the value of the first distance is in the range of 4 mm to 10 mm. The distance between the side of the second solder strip near the second edge and the second edge is the second distance, and the value of the second distance is in the range of 4 mm to 10 mm.

2. The photovoltaic module according to claim 1, characterized in that, When the insulating strip covers the first solder strip and the second solder strip, there are multiple first solder strips, and the multiple first solder strips are spaced apart along the first direction. The first distance is the distance between the side of the first solder strip adjacent to the first edge and the first edge among the multiple first solder strips. The number of the second solder strips is multiple, and the multiple second solder strips are spaced apart along the first direction. The second distance is the distance between the side of the second solder strip adjacent to the second edge and the second edge.

3. The photovoltaic module according to claim 1, characterized in that, When the insulating strip covers the first solder strip and the second solder strip, the solder strip further includes: The third weld strip, along the first direction, is located on the side of the first edge away from the second edge. The distance between the side of the third weld strip close to the first edge and the first edge is the third distance, and the value of the third distance ranges from 1 mm to 10 mm. The fourth weld strip is located along the first direction on the side of the second edge away from the first edge. The distance between the side of the fourth weld strip close to the second edge and the second edge is the fourth distance, which ranges from 1 mm to 10 mm.

4. The photovoltaic module according to claim 1, characterized in that, When the insulating strip covers the first solder strip and the second solder strip, the first distance ranges from 6 mm to 10 mm, and the second distance ranges from 6 mm to 10 mm.

5. The photovoltaic module according to claim 1, characterized in that, When the insulating strip is disposed between the first solder strip and the second solder strip, along the first direction, the distance between the side of the first solder strip closest to the first edge and the first edge is the fifth distance, and the value of the fifth distance ranges from 1 mm to 10 mm. Along the first direction, the distance between the side of the second weld strip closest to the second edge and the second edge is the sixth distance, and the value of the sixth distance ranges from 1 mm to 10 mm.

6. The photovoltaic module according to claim 1, characterized in that, Along the first direction, the width of the insulating strip ranges from 10 mm to 35 mm.

7. The photovoltaic module according to claim 1, characterized in that, Also includes: A first busbar is disposed on the side of the insulating strip away from the solar cell, and the first busbar is connected to the solar cell.

8. The photovoltaic module according to claim 1, characterized in that, The insulating strip includes: Insulating layer; A first buffer layer is stacked along the thickness direction of the insulating layer on the side of the insulating layer closest to the solar cell; The second buffer layer is stacked along the thickness direction of the insulating layer on the side of the insulating layer away from the first buffer layer.

9. The photovoltaic module according to any one of claims 1 to 8, characterized in that, The solar cell has a positive electrode pad on its light-receiving surface and a negative electrode pad on its back surface; or, The back surface of the solar cell is provided with the positive electrode pad and the negative electrode pad.

10. The photovoltaic module according to any one of claims 1 to 8, characterized in that, The plurality of solar cells include a first solar cell and a second solar cell arranged adjacent to each other along the second direction; The first solar cell and the second solar cell are arranged at intervals; or, Along the second direction, the light-receiving surface of the first solar cell and the back-lighting surface of the second solar cell partially overlap.

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