Solar cell module

Abstract

The invention provides a solar cell module. The solar cell module comprises an adhesive film and a back plate, a plurality of battery strings, wherein adjacent battery strings are spaced by a first gap; the plurality of adhesive components are suitable for fixing adjacent battery strings, each adhesive component comprises a first part and a second part, the first part is located in the first gap and extends along the thickness direction of the battery string, the extending direction of the second part is parallel to the battery string, one end of the first part in the first direction is connected with the second part, and the other end of the first part in the second direction is connected with the adhesive component; the other end of the first part in the first direction is contacted with the adhesive film, and the second part is positioned between the back plate and the battery string. According to the solar cell module provided by the invention, the heat conduction efficiency of the solar cell module can be improved, the stability and reliability of the module are improved, and the power generation efficiency of the solar cell module is further improved.

Description

Technical Field

[0001] This application mainly relates to the field of battery technology, and particularly relates to a solar cell module. Background Art

[0002] With the increasing shortage of energy and the continuous rise of energy prices, the development and utilization of new energy have become a hot topic in current research. Photovoltaic technology, as a technology that can directly convert solar energy into electrical energy, is widely used due to its characteristics such as pollution-free and inexhaustible. The structural design of photovoltaic modules directly affects the power generation efficiency of photovoltaic modules. In the application of existing photovoltaic modules, they are generally divided into conventional modules and high-density modules. Conventional modules are the traditional row-string method. Conventional photovoltaic modules are relatively mature in design and manufacturing, with lower costs, and are suitable for solar power generation systems of various scales; high-density photovoltaic modules are a new type of photovoltaic module developed in recent years, aiming to improve power generation efficiency and power generation amount by optimizing the module structure and increasing the number of solar cells 41 per unit area. Representative technologies of high-density photovoltaic modules include shingling technology, string welding technology, and chip-splicing technology, etc.

[0003] Whether it is a conventional module or a high-density module, there is still a problem of relatively large gaps between battery strings, and the blank area of the module is relatively large. This increases the width of the entire module. On the one hand, it increases the installation space of the module system; on the other hand, the space utilization rate of the module is relatively low, resulting in a relatively low power generation efficiency per unit area. In addition, in a harsh environment, due to hot spots, the temperature of the solar cells 41 will increase. However, since the gaps between adjacent battery strings are relatively large, it is difficult for the hot-spot battery cells to transfer heat to adjacent battery strings, so that the hot-spot battery cells are always in a high-temperature state, and the module is prone to failure. Summary of the Invention

[0004] The technical problem to be solved by this application is to provide a solar cell module that can improve the heat conduction efficiency of the solar cell module, provide the stability and reliability of the module, and further improve the power generation efficiency of the solar cell module.

[0005] To solve the above technical problem, this application provides a solar cell module, including: an encapsulant and a backsheet; a plurality of battery strings, with a first gap between adjacent battery strings; a plurality of bonding members, suitable for fixing adjacent battery strings. The bonding member includes a first part and a second part. Among them, the first part is located in the first gap, the first part extends along the thickness direction of the battery string, the extending direction of the second part is parallel to the battery string, one end of the first part in a first direction is connected to the second part, the other end of the first part in the first direction is in contact with the encapsulant, and the second part is located between the backsheet and the battery string.

[0006] Optionally, the width of the first gap is greater than 0.1 mm and less than 2 mm.

[0007] Optionally, the curing temperature of the adhesive member is greater than 150 °C.

[0008] Optionally, each of the battery strings includes a plurality of main grid lines, and the second part further includes a plurality of contact parts in a second direction, and an edge of the contact part contacts the main grid line closest to the contact part.

[0009] Optionally, the adhesive member includes an intermediate adhesive member and an edge adhesive member, the intermediate adhesive member is disposed in a middle area of the battery string, and the edge adhesive member is disposed in an edge area of the battery string

[0010] Optionally, a first contact area exists between a contact part of the intermediate adhesive member and the battery string, and a second contact area exists between a contact part of the edge adhesive member and the battery string, and the second contact area is greater than the first contact area.

[0011] Optionally, the number of the intermediate adhesive members is less than the number of the edge adhesive members.

[0012] Optionally, the second part of the adhesive member includes an arc surface and / or a flat surface.

[0013] Optionally, the adhesive member further includes a light-reflecting filler and a heat-conducting material, the light-reflecting filler includes any one of titanium dioxide, talcum powder, lead white, mica, calcium sulfate, calcium carbonate, zinc oxide, magnesium oxide, iron oxide, etc., and the heat-conducting material includes any one of silicon carbide, aluminum nitride, silicon dioxide, diamond, etc.

[0014] Optionally, the heat conductivity coefficient of the adhesive member is greater than 1 W / (m·K).

[0015] Compared with the prior art, through the structure and heat-conducting performance setting of the adhesive member, the present application enables the adhesive member to have heat-conducting ability, which can reduce the high temperature caused by the hot spot effect, transfer the temperature to adjacent battery strings or other component materials through the adhesive member, prevent the battery chip 41 from overheating and being damaged, and thus improve the power generation efficiency of the component. Further, the adhesive member can fix the battery strings, and by setting the width of the first gap between the battery strings to be between 0.1 mm and 2 mm, the distance between the battery strings can be effectively reduced, thereby effectively reducing the ineffective blank area of the solar cell module, enabling the battery strings to be closely arranged, and improving the light-receiving area and power generation efficiency of the solar cell module. Further, the battery strings are adhesively fixed through the adhesive member, which can effectively fix the battery strings during the lamination process, thereby avoiding the risks of short circuit and fragmentation. Description of the Drawings

[0016] The accompanying drawings are provided to further understand the present application. They are incorporated and constitute a part of the present application. The drawings illustrate embodiments of the present application and, together with this specification, serve to explain the principles of the present application. In the drawings:

[0017] Figure 1 is a front view of a solar cell module in an embodiment of the present application;

[0018] Figure 2 is as in Figure 1 a partial front view of a solar cell module in the illustrated embodiment of the present application;

[0019] Figure 3 is a partial front view of a solar cell module in an embodiment of the present application;

[0020] Figure 4 is a partial front view of a solar cell module in another embodiment of the present application;

[0021] Figure 5 is a partial cross-sectional view of a solar cell module in an embodiment of the present application;

[0022] Figure 6 is a partial cross-sectional view of a solar cell module in another embodiment of the present application;

[0023] Figures 7 to 9 is a hot spot temperature distribution diagram of a solar cell module in an embodiment of the present application;

[0024] Figure 10 is a line graph showing the relationship between the number of bypass diodes connected in parallel to the cells and the hot spot temperature in a solar cell module in an embodiment of the present application;

[0025] Figure 11 is a line graph showing the relationship between the contact area and the tensile force between the bonding member and the cell 41 in a solar cell module in an embodiment of the present application. Detailed Description of the Embodiments

[0026] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some examples or embodiments of the present application. For those of ordinary skill in the art, without creative efforts, the present application can also be applied to other similar scenarios based on these drawings. Unless obvious from the language context or otherwise stated, the same reference numerals in the drawings represent the same structures or operations.

[0027] As shown in this application and the claims, unless the context clearly indicates otherwise, words such as "a", "an", "one", and / or "the" are not specifically singular and may also include the plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0028] Unless otherwise specifically stated, the relative arrangements of the components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of this application. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, such technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, further discussion thereof is not required in subsequent drawings.

[0029] In the description of this application, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom" are usually based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing this application and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of this application; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0030] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper", etc. may be used herein to describe the spatial positional relationship of a device or feature shown in the figures with respect to other devices or features. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations of the spatial relative descriptions used herein will be made.

[0031] In addition, it should be noted that the use of terms such as "first", "second", etc. to limit components is merely for the convenience of distinguishing the corresponding components. Without further statement, the above terms have no special meaning, and thus should not be construed as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some of the terms mentioned in the specification of this application may be selected by the applicant according to his or her judgment, and their detailed meanings are described in the relevant parts of the description herein. In addition, it is required to understand this application not only through the actual terms used, but also through the meaning implied by each term.

[0032] This application refers to Figures 1 to 3 and Figure 5 which shows a solar cell module 10 (hereinafter referred to as "cell module 10"). Figure 1 which shows a front view of the cell module 10. Figure 2 which shows a front view of a partial area of the cell module 10. Figure 3 which shows a partial front view of the cell module 10. Figure 5 which shows a partial cross-sectional view of the cell module 10.

[0033] Specifically, referring to Figures 1 to 3 and Figure 5 , the cell module 10 mainly includes an encapsulant 11, a backsheet 12, a plurality of cell strings 13, and a plurality of bonding members 14. Among them, the cell string 13 includes a plurality of cells 41, and there is a first gap S1 between adjacent cell strings 13. The bonding member 14 is suitable for fixing adjacent cell strings 13, and the bonding member 14 includes a first part 141 and a second part 142. Among them, more specifically referring to Figure 5, the first part 141 is located within the first gap S1. The first part 141 extends along the thickness direction of the battery string 13. The extending direction of the second part 142 is parallel to the battery string 13. One end of the first part 141 in the first direction Y is connected to the second part 142, and the other end of the first part 141 in the first direction Y is in contact with the encapsulant film 11. The second part 142 is located between the backsheet 12 and the battery string 13. As Figure 5 shown, the battery module 10 further includes a glass 15.

[0034] In this embodiment, through the structural arrangement of the first part 141 and the second part 142, a heat transfer channel can be provided for the battery string 13. Further, each battery string 13 includes a plurality of main grid lines 131. The second part 142 further includes a plurality of contact parts 21 in the second direction X. The edge of the contact part 21 is in contact with the main grid line 131 closest to the contact part 21. Through this structural arrangement, the heat conduction rate can be improved.

[0035] Further, the bonding member 14 can contact the first main grid line 131 located at the edge of the battery. By setting the bonding member 14 to be a structure that can contact the main grid line 131, there can be three heat transfer channels for the heat of the cell 41 at this time:

[0036] The first one: cell 41 → bonding member 14 → cell 41;

[0037] The second one: cell 41 → bonding member 14 → main grid line 131 (bus bar + silver paste) → cell 41;

[0038] The third one: cell 41 → bonding member 14 → main grid line 131 (bus bar + silver paste) → the current cell 41 + the front and rear adjacent cells 41.

[0039] Therefore, by the structural arrangement that the bonding member 14 contacts the first main grid line 131 at the edge of the battery, the heat transfer speed and the number of channels can be greatly increased, and the temperature region of the entire module can be made uniform in a short time. In this embodiment, the bonding member 14 only contacts the first main grid line 131 at the edge of the battery, and the length of the contact part 21 in the second direction X does not exceed the main grid line 131.

[0040] For a clearer reference Figure 2 , the width w of the first gap S1 is greater than 0.1 mm and less than 2 mm. By setting the width of the first gap between the battery strings to be between 0.1 mm and 2 mm, the distance between the battery strings can be effectively reduced, thereby effectively reducing the ineffective blank area of the solar cell module. Further, the battery module 10 can include more cells 41, and the power generation efficiency per unit area can be improved. The close arrangement of the battery strings can be achieved, and the light-receiving area and power generation efficiency of the solar cell module can be improved.

[0041] Furthermore, since the first gap S1 between the battery strings 13 is smaller than the conventionally set gap, during the lamination process, the flow of EVA and the change in air pressure are more likely to cause the battery strings to move, resulting in easy extrusion and fragmentation or short - circuit between the batteries. The provision of the bonding member 14 can effectively fix the battery strings during the lamination process, thus avoiding the risks of short - circuit and fragmentation.

[0042] Preferably, in this embodiment, the curing temperature of the bonding member 14 is greater than 150 °C. The bonding member 14 further includes a heat - conducting material, and the heat - conducting material includes any one of silicon carbide, aluminum nitride, silicon dioxide, and diamond. At the same time, the heat - conducting material can also be a single - component or multi - component silicone, epoxy resin, acrylic acid, polyurethane, etc. that combines heat conduction, bonding, and insulation functions. The thermal conductivity of the bonding member 14 is greater than 1 W / (m﹒K).

[0043] Now, the specific process of preparing the bonding member 14 will be introduced. After the battery welding is completed, the bonding member 14 is applied between the battery strings 13, and the bonding member 14 is cured, and finally the lamination is completed. Since the curing temperature of the bonding member 14 in this embodiment is greater than 150 °C, it is ensured that during the lamination process, the bonding member remains in a stable cured state. Since this is not the focus of this application, no more details will be elaborated here.

[0044] Through the provision of the bonding member 14, on the one hand, adjacent battery strings 13 can be fixed to ensure that the battery strings 13 do not move. On the other hand, since the bonding member 14 has certain thermal conductivity and insulation properties, when a local hot spot appears in the battery module 10, causing a local temperature rise, the applied bonding member 14 can quickly conduct the high temperature of the hot - spot battery string 13 to the adjacent battery strings 13, further reducing the temperature of the hot - spot battery cells 41 and balancing the overall temperature of the photovoltaic module, thereby improving the stability and reliability of the module.

[0045] In addition, during outdoor operation, usually only about 15% - 25% of the energy of sunlight incident on the surface of the battery module 10 is converted into electrical energy, and most of the other light energy is converted into heat, causing the battery module 10 to heat up. Due to factors such as the difference in the installation angle of the battery module 10 and the non - uniformity of the module materials, there will be a temperature difference between different battery strings 13. There are interconnection solder tapes in the vertical direction of the battery strings 13, which can conduct heat. In the horizontal direction of the battery strings, heat can be transferred through the bonding member 14, making the temperature of the entire battery module 10 tend to be consistent, reducing the thermal deformation caused by the temperature difference, and improving the stability and reliability of the module. At the same time, in the harsh outdoor environment, once the battery string 13 is deformed, due to the certain elasticity of the bonding member 14, it can buffer and release a certain amount of stress, further improving the reliability.

[0046] Refer to Figure 3, the bonding member 14 further includes an intermediate bonding member 31 and an edge bonding member 32. The intermediate bonding member 31 is disposed in the intermediate region of the battery string 13, and the edge bonding member 32 is disposed in the edge region of the battery string. In this embodiment, the edge region of the battery string 13 is the region where the two outermost columns of the battery string 13 are located, and the intermediate region of the battery string 13 is all other regions except the edge region.

[0047] Further, referring to Figures 7 to 9 , Figures 7 to 9 shows the hot spot temperature distribution diagram of the battery module 10. As Figures 7 to 9 shown, the highest temperature point caused by the hot spot is uniformly transmitted to the surroundings of the battery string 13 in a divergent form, and the temperature transmission speed is relatively fast. The temperature of the entire battery string 13 reaches uniformity in a relatively short time. Therefore, it is required that the connected bonding member has a certain heat conduction rate to quickly transfer heat to adjacent battery strings. At the same time, it can be seen from the figure that the temperature in the intermediate region of the battery string 13 is slightly higher than that in the edge region. After the hot spot occurs, the temperature at the edge region of the battery cells 41 in the battery string 13 is relatively low, and the temperature near the intermediate region is relatively high. On the one hand, mainly because the transmission distance of the hot spot temperature point to the four corners is far, resulting in a low temperature. On the other hand, in the vertical direction of the battery cell 41, part of the heat can be transferred to adjacent battery cells 41 through the welding tape. Therefore, the temperature in the edge region is relatively low, while the temperature in the center of the battery cell 41 is relatively high due to the lag of temperature transmission. Therefore, the edge region requires higher heat conduction ability and faster heat conduction efficiency.

[0048] In addition, during the lamination process, on the one hand, due to the difference in temperature distribution, the temperature in the edge region is relatively low, and greater stress will be generated during lamination. And the pressure received by the edge region is less than that in the intermediate region, so greater mechanical stress will be generated during the lamination process. Therefore, the battery string 13 in the edge region requires greater bonding force to be fixed.

[0049] To meet the above requirements, as Figure 3 shown, by keeping the first contact area A1 between the intermediate bonding member 31 and the battery string 13 and the second contact area A2 between the edge bonding member 32 and the battery string 13 the same, the purpose of improving the heat conduction ability and bonding force of the edge region is achieved by increasing the number of the edge bonding members 32.

[0050] Specifically, as Figure 3As shown in the figure, taking a half-sheet of a split sheet as an example, at least 4 bonding members are provided between the cells 41 of two adjacent cell strings 13, and all the bonding members 14 are evenly distributed. Since the temperature in the middle region of the cell 41 is higher than that in the edge region under high temperature conditions, at least 2 bonding members are provided in the middle region. When the cell string 13 in the middle region has a high temperature caused by a hot spot, the high-temperature cell 41 has at least two heat transfer paths, and it can conduct heat to the adjacent cell strings 13 on the left and right sides, while the cell string 13 in the edge region can only conduct heat to the cell string 13 close to the middle region. Therefore, in order to improve the heat transfer rate of the edge cell string temperature, at least one bonding member is added between the cell string 13 in the edge region and the adjacent cell string 13 in the middle region. In order to ensure the stability of the cell string, by increasing the number of edge bonding members 32, the cell string 13 in the edge region has more heat transfer channels, and it can also ensure that the temperature is quickly transferred to the adjacent cell string 13.

[0051] Figure 11 The figure shows a broken line graph of the relationship between the contact area and the tensile force between the bonding member and the cell 41 in the solar cell module 10. Generally speaking, the hot spot temperature of the shaded solar cell is determined by the power dissipated per unit area, which is divided into a uniform heating part and a non-uniform heating part, and is related to the reverse bias voltage at both ends of the shaded solar cell, the magnitude of the leakage current of the solar cell, and the distribution of the leakage current of the solar cell. The reverse bias voltage is comprehensively determined by the number of solar cells in a single string and the shading ratio. Under the condition of a fixed shading ratio, when the number of cells connected in parallel with a single bypass diode increases, the reverse bias voltage and the power consumption will increase accordingly, resulting in an increase in the heating power of the shaded cell, and thus increasing the hot spot risk.

[0052] Figure 10 The figure shows the relationship between the number of cells connected in parallel with the bypass diode and the hot spot temperature in the cell module 10. Therefore, for the difference in the number of cells connected in parallel with the bypass diode, different numbers of bonding members 14 can be used. By increasing the heat conduction ability of the bonding member 14, the high temperature brought by the hot spot is conducted to the adjacent cells and other component materials, preventing the cell 41 from overheating and burning out.

[0053] This application can also design the number of bonding members 14 required for different solar cells 41 according to the relationship between the number of bypass diode - paralleled cells and the hot - spot temperature. Referring to the following table, when the number of bypass diode - paralleled cells is 16 and 20, the number of middle bonding members 31 is not less than 4, and the number of edge bonding members 32 is not less than 5. The distribution method can be one bonding member 14 at each end, and the remaining bonding members 14 are evenly distributed in the middle area. When the number of paralleled cell strings is 24, the number of middle bonding members 31 is not less than 5, and the number of edge bonding members 32 is not less than 6. The distribution method can be one bonding member 14 at each end, and the remaining bonding members 14 are evenly distributed in the middle area. When the number of paralleled cell strings is 26, the number of middle bonding members 31 is not less than 6, and the number of edge bonding members 32 is not less than 7. The distribution method can be one bonding member 14 at each end, and the remaining bonding members 14 are evenly distributed in the middle area. Since this design method is not the focus of this application, it will not be elaborated here again.

[0054] Number of batteries in parallel with bypass diodes Number of intermediate bonding members 31 Number of edge bonding members 32 16 4 5 20 4 5 24 5 6 26 6 7

[0055] In other embodiments of the present application, for example, in the Figure 4 solar cell module 20 shown, there is a first contact area A1 between the contact part 21 of the middle bonding member 31 of the cell module 10 and the cell string 13, and a second contact area A2 between the contact part 21 of the edge bonding member 32 and the cell string 13. The second contact area A2 is larger than the first contact area A1, so as to improve the heat conduction ability and bonding force in the edge area. In the cell module 10, the number of middle bonding members 31 is the same as the number of edge bonding members 32.

[0056] This application can also design the contact area between the bonding member 14 required for different solar cells 41 and the solar cell 41. As shown in the following table, some parameters of the contact area between the middle bonding member 31, the edge bonding member 32 and the solar cell 41 under different numbers of bypass diode - paralleled cells are provided.

[0057] Since it is not the focus of this application, it will not be elaborated here.

[0058]

[0059] Furthermore, referring to Figure 5 , Figure 5A partial cross-sectional view of the battery assembly 10 is shown. In this embodiment, the thickness of the adhesive member 14 is less than or equal to the thickness of the adhesive film 11. Under normal circumstances, when a hot spot causes the temperature of the solar cell 41 to rise, the heat transfer path is from the high-temperature solar cell 41 to the adhesive member 14, and then from the adhesive member 14 to the solar cells 41 of the adjacent low-temperature battery string 13. When the applied adhesive member 14 contacts the backsheet 12, the heat transfer path can be increased, and part of the heat can also be transferred from the adhesive member 14 to the backsheet 12 and then directly to the outside air, further improving the heat transfer rate. On the other hand, when the adhesive member 14 contacts encapsulation materials such as the adhesive film, the heat transfer channels can also be increased, further improving heat conduction.

[0060] On the other hand, referring to Figure 5 and Figure 6 , Figure 6 a partial cross-sectional view of the solar cell assembly 30 proposed in another embodiment of the present application is shown. Referring to Figure 5 and Figure 6 , the second part 142 of the adhesive member 14 includes a curved surface as shown in Figure 5 or a flat surface as shown in Figure 6 . In this embodiment, the second part 142 of the battery assembly 10 is in an arc shape, with a relatively high reflectivity, higher light energy utilization rate, and more obvious optical gain.

[0061] Furthermore, the adhesive member 14 further includes a reflective filler, and the reflective filler includes any one of titanium dioxide, talcum powder, lead white, mica, calcium sulfate, calcium carbonate, zinc oxide, magnesium oxide, and iron oxide. This enables the adhesive member 14 to be transparent or present a light-colored tone after curing, such as white, light gray, or light yellow. This tone color has a relatively high reflection ability, and when combined with a spherical adhesive member, the optical gain can be further increased. Exemplarily, the coating method of the adhesive member 14 can be printing or dispensing.

[0062] In this embodiment, Figure 10 it can be seen that as the contact area between the adhesive member 14 and the solar cell 41 increases, the tensile force between the adhesive member 14 and the solar cell 41 first increases and then remains unchanged. When the contact area between the adhesive member and the solar cell 41 gradually increases, the adhesive member can more effectively form intermolecular forces (such as van der Waals forces, hydrogen bonds, etc.) with the material surface, and these forces are important components of the adhesive force. The increase in the contact area means that more intermolecular forces are formed, thus enhancing the overall adhesive force.

[0063] In addition, during the process of increasing the contact area, the distribution of the tensile force on the contact surface between the adhesive structure member 14 and the solar cell 41 becomes more uniform, which helps to reduce the stress concentration phenomenon, enables the adhesive force to be transmitted more effectively, and thus improves the overall tensile force performance. As the contact area continues to increase, the adhesive force between the adhesive structure member 14 and the solar cell 41 will gradually reach a saturation state. This is because when the contact area increases to a certain extent, the contribution of the newly added contact area to the adhesive force will gradually decrease until it hardly increases any more. At this time, the adhesive force is mainly determined by the intermolecular forces that have already formed, and the newly added contact area has little effect on the improvement of the tensile force. In addition to the adhesive force reaching saturation, the strength of the material may also be a factor limiting the further increase of the tensile force.

[0064] Therefore, when the tensile force increases to a certain extent, it may reach the strength limit of the material, causing the material to break or deform, thereby limiting the further increase of the tensile force. Since the heat conduction rate of the adhesive structure member 14 increases with the increase of the contact area, but considering that the tensile force between the adhesive structure member 14 and the solar cell 41 cannot be too large, if the tensile force of the adhesive structure member is too large, the hard contact between the adhesive structure member and the battery will also cause the solar cell 41 to break during the lamination process. Therefore, in this embodiment, considering the cost and tensile force of the adhesive structure member comprehensively, the tensile force between the adhesive structure member 14 and the solar cell 41 should be controlled below 15 N. When the second part 142 of the adhesive structure member 14 is an arc surface as shown in Figure 5 Figure, the diameter of the arc surface structure of the second part 142 of the adhesive structure member 14 needs to satisfy 1 mm < diameter < 3 mm; when the second part 142 of the adhesive structure member 14 is a flat surface as shown in Figure 6 Figure, the width W of the second part of the adhesive structure member 14 needs to satisfy 0.5 mm < W < 4 mm.

[0065] The adhesive structure member 14 in the solar cell module provided by this application can be applied to any one of PERC cells, TOPcon cells, HJT cells or BC cells, and the solar cells can be 2-piece or multi-piece.

[0066] Compared with the prior art, through the structure and heat conduction performance settings of the bonding member, the bonding member has heat conduction ability, which can reduce the high temperature caused by the hot spot effect, transfer the temperature to the adjacent battery string or other component materials through the bonding member, prevent the solar cell 41 from overheating and being damaged, and thus improve the power generation efficiency of the component. Further, the bonding member can fix the battery strings, and by setting the first gap width between the battery strings between 0.1 mm and 2 mm, the distance between the battery strings can be effectively reduced, thereby effectively reducing the ineffective blank area of the solar cell module, enabling the battery strings to be closely arranged, and improving the light receiving area and power generation efficiency of the solar cell module. Further, the battery strings are adhesively fixed through the bonding member, which can effectively fix the battery strings during the lamination process, thereby avoiding the risks of short circuit and fragmentation.

[0067] The basic concepts have been described above. Obviously, for those skilled in the art, the above application disclosure is only an example and does not constitute a limitation to this application. Although not explicitly stated here, those skilled in the art may make various modifications, improvements, and corrections to this application. Such modifications, improvements, and corrections are proposed in this application, so such modifications, improvements, and corrections still fall within the spirit and scope of the exemplary embodiments of this application.

[0068] At the same time, specific terms are used in this application to describe the embodiments of this application. Such as "one embodiment", "an embodiment", and / or "some embodiments" mean a certain feature, structure, or characteristic related to at least one embodiment of this application. Therefore, it should be emphasized and noted that the "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more at different positions in this specification does not necessarily refer to the same embodiment. In addition, certain features, structures, or characteristics in one or more embodiments of this application can be appropriately combined.

[0069] Similarly, it should be noted that, in order to simplify the expression of this application disclosure and thus help the understanding of one or more application embodiments, in the previous description of the embodiments of this application, sometimes multiple features are merged into one embodiment, drawing, or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than those mentioned in the claims. In fact, the features of the embodiment are less than all the features of the single embodiment disclosed above.

[0070] In some embodiments, numbers are used to describe components and the quantity of attributes. It should be understood that such numbers used in the description of embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise stated, "about", "approximately" or "substantially" indicate that the stated number allows a variation of ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may vary according to the characteristics required by individual embodiments. In some embodiments, the numerical parameters should consider the specified significant digits and adopt the method of retaining the general number of digits. Although the numerical ranges and parameters used to confirm the breadth of the scope in some embodiments of the present application are approximate values, in specific embodiments, such numerical settings are made as precise as possible within the feasible range.

[0071] Although the present application has been described with reference to the current specific embodiments, those of ordinary skill in the art should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions can be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications of the above embodiments are within the scope of the spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A solar cell module, characterized in that, Comprising: A glue film and a backplane; A plurality of battery strings, with a first gap between adjacent battery strings; A plurality of adhesive members, suitable for fixing adjacent battery strings. The adhesive member includes a first part and a second part. Wherein, the first part is located within the first gap, the first part extends along the thickness direction of the battery string, the extending direction of the second part is parallel to the battery string, one end of the first part in a first direction is connected to the second part, the other end of the first part in the first direction is in contact with the glue film, and the second part is located between the backplane and the battery string.

2. The solar cell module according to claim 1, wherein The width of the first gap is greater than 0.1 mm and less than 2 mm.

3. The solar cell module according to claim 1, wherein The curing temperature of the adhesive member is greater than 150 °C.

4. The solar cell module according to claim 1, characterized in that, Each battery string includes a plurality of main grid lines. The second part of the adhesive member further includes a plurality of contact parts in a second direction, and the edge of the contact part is in contact with the main grid line closest to the contact part.

5. The solar cell module according to claim 4, characterized in that, The adhesive member includes an intermediate adhesive member and an edge adhesive member. The intermediate adhesive member is arranged in the middle area of the battery string, and the edge adhesive member is arranged in the edge area of the battery string.

6. The solar cell module according to claim 5, wherein There is a first contact area between the contact part of the intermediate adhesive member and the battery string, and a second contact area between the contact part of the edge adhesive member and the battery string. The second contact area is greater than the first contact area.

7. The solar cell module according to claim 5, characterized in that, The number of the intermediate adhesive members is less than the number of the edge adhesive members.

8. The solar cell module according to claim 1, characterized in that, The second part of the adhesive member includes an arc surface and / or a flat surface.

9. The solar cell module according to claim 1, wherein, The adhesive member further includes a reflective filler and a thermal conductive material. The reflective filler includes any one of titanium dioxide, talcum powder, lead white, mica, calcium sulfate, calcium carbonate, zinc oxide, magnesium oxide, iron oxide, etc. The thermal conductive material includes any one of silicon carbide, aluminum nitride, silicon dioxide, diamond, etc.

10. The solar cell module according to claim 1, characterized in that, The thermal conductivity of the adhesive member is greater than 1 W / (m﹒K).

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