Photovoltaic junction box and photovoltaic module
By setting a heat dissipation structure with a substrate and heat dissipation fins under the photovoltaic junction box, the problem of low heat dissipation efficiency of photovoltaic junction boxes is solved, achieving more efficient heat dissipation and power generation performance, and reducing the risk of fire.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WUXI UTMOST LIGHT TECH CO LTD
- Filing Date
- 2025-07-17
- Publication Date
- 2026-05-26
AI Technical Summary
The low heat dissipation efficiency of photovoltaic junction boxes leads to heat accumulation inside the box, affecting power generation efficiency and posing a fire risk.
A heat dissipation structure, including a substrate and heat dissipation fins, is installed at the bottom of the photovoltaic junction box. The substrate and fins increase the heat dissipation area and channels, improve heat dissipation efficiency, and form a heat dissipation channel at the bottom of the box to enhance local heat dissipation performance.
It effectively reduces the internal temperature of photovoltaic junction boxes, improves heat dissipation efficiency, extends service life, enhances power generation, and reduces fire risk.
Smart Images
Figure CN224289734U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat dissipation of photovoltaic modules, specifically to a photovoltaic junction box and a photovoltaic module. Background Technology
[0002] As the current collection node of the photovoltaic module, the junction box bears a high current load for a long time, and the temperature of the diodes and solder joints inside the box is relatively high. In related technologies, the heat dissipation of the junction box relies on the passive heat conduction of the junction box itself. If the junction box cannot quickly dissipate heat, serious heat accumulation will occur inside the box, resulting in reduced power generation of the photovoltaic module and accelerated power degradation. In some cases, it may even cause a fire due to overheating of the junction box. Utility Model Content
[0003] In view of this, the present invention provides a photovoltaic junction box and a photovoltaic module to solve the technical problem of low heat dissipation efficiency of photovoltaic junction boxes.
[0004] This utility model provides a photovoltaic junction box, comprising:
[0005] The housing and the heat dissipation structure located below the housing;
[0006] The heat dissipation structure includes a substrate and heat dissipation fins disposed on the substrate, with at least a portion of the heat dissipation fins on the side away from the substrate contacting the bottom of the housing.
[0007] Beneficial Effects: A heat dissipation structure is installed at the bottom of the box, comprising a substrate and heat dissipation fins on the substrate. The substrate and fins effectively increase the heat dissipation area, thereby improving the heat dissipation efficiency and allowing the structure to quickly remove heat from the box. Furthermore, the contact between the fins and the box creates a heat dissipation channel at the bottom, further accelerating heat dissipation and preventing severe heat buildup inside the box, thus ensuring the power generation performance of the photovoltaic modules. Additionally, by placing at least a portion of the heat dissipation fins away from the substrate in contact with the bottom of the box, some fins are located in high-temperature areas, enhancing localized heat dissipation and preventing excessively high local temperatures inside the box. This further improves the heat dissipation efficiency of the structure, ensuring the overall heat dissipation efficiency of the photovoltaic junction box.
[0008] In an optional embodiment, the heat dissipation fins include a first heat dissipation fin and a second heat dissipation fin, wherein the first heat dissipation fin protrudes from the second heat dissipation fin, and at least the first heat dissipation fin is disposed in contact with the bottom of the housing, and the second heat dissipation fin is disposed in contact with or spaced from the bottom of the housing.
[0009] In one optional embodiment, the bottom of the housing is recessed to form a mounting cavity, and the first heat dissipation fins are correspondingly disposed within the mounting cavity.
[0010] In an optional embodiment, the mounting cavity is disposed through in a direction parallel to the substrate, and the first heat dissipation fins form a heat dissipation channel with the inner sidewall of the mounting cavity.
[0011] In one optional embodiment, a through hole is provided on the substrate corresponding to the heat dissipation channel.
[0012] In an optional embodiment, a ceramic layer is further included, which covers the outer surfaces of the substrate, the first heat sink fin, and the second heat sink fin.
[0013] In an optional embodiment, a reflective layer is further included, which covers the outer surface of the ceramic layer.
[0014] This utility model also provides a photovoltaic module, comprising:
[0015] A backplate, wherein the backplate includes lead wires;
[0016] As described above, the photovoltaic junction box has a heat dissipation structure disposed on the back plate, and the lead wire is electrically connected to the photovoltaic junction box.
[0017] Beneficial Effects: The photovoltaic (PV) junction box is mounted on the back panel, and its heat dissipation structure is also located on the back panel. Heat is transferred through a thermally conductive medium, achieving heat dissipation for the PV module. Leads are also provided on the back panel, electrically connected to the PV junction box. During operation, the electrical energy generated in the PV module is transferred to the PV junction box through the positive and negative leads, and then output to the external circuit through the junction box. The electrical connection components inside the PV junction box generate heat during operation, which is dissipated through the substrate and the first heat dissipation fins, ensuring the normal operating temperature of the PV junction box and extending the lifespan of the PV module.
[0018] In an optional embodiment, a thermally conductive grease layer is provided between the backplate and the substrate, and the thermally conductive grease layer is located around the lead wire.
[0019] In an optional embodiment, a sealant is also included at the junction of the photovoltaic junction box and the backplate. Attached Figure Description
[0020] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0021] Figure 1 This is a schematic diagram of the structure of a photovoltaic junction box according to an embodiment of the present utility model;
[0022] Figure 2 for Figure 1 Enlarged diagram of A in the middle;
[0023] Figure 3 This is a temperature diagram of a photovoltaic junction box and a conventional junction box under short-circuit conditions according to an embodiment of the present invention;
[0024] Figure 4 This is a temperature diagram illustrating a photovoltaic junction box and a conventional junction box under normal operating conditions, according to an embodiment of this utility model.
[0025] Figure 5 This is a schematic diagram illustrating the power generation of a photovoltaic junction box and a conventional junction box under normal operating conditions, according to an embodiment of this utility model.
[0026] Explanation of reference numerals in the attached figures:
[0027] 10. Backplate; 11. Thermal grease layer; 12. Positive lead; 13. Negative lead; 100. Housing; 110. Substrate; 111. Second heat dissipation fin; 120. First heat dissipation fin; 130. Sealant; 140. Ceramic layer; 150. Reflective layer; 160. Mounting cavity. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0029] According to embodiments of the present invention, on the one hand, such as Figure 1 , Figure 2As shown, a photovoltaic junction box is provided, including: a box body 100 and a heat dissipation structure located below the box body 100; the heat dissipation structure includes a substrate 110 and heat dissipation fins disposed on the substrate 110, and at least a portion of the heat dissipation fins on the side away from the substrate 110 are in contact with the bottom of the box body 100.
[0030] In this embodiment, the housing 100 has a certain accommodating space for placing electrical connection components and protecting the electrical connection components inside the housing 100. A heat dissipation structure is provided below the housing 100. The heat dissipation structure consists of a substrate 110 and heat dissipation fins disposed on the substrate 110; the substrate 110 can be an aluminum alloy plate; by providing heat dissipation fins on the substrate 110, the heat dissipation area of the heat dissipation structure can be effectively increased, thereby improving the heat dissipation efficiency of the heat dissipation structure, allowing the heat dissipation structure to quickly dissipate the heat inside the housing 100. Furthermore, through the contact between the heat dissipation fins and the housing 100, due to the spacing of the heat dissipation fins themselves, multiple heat dissipation channels can be formed at the bottom of the housing 100, making a portion of the bottom area of the housing suspended. Compared to the prior art where the housing 100 is directly in contact with the backsheet of the photovoltaic module, this solution can significantly improve the heat dissipation speed, avoid serious heat accumulation inside the housing 100, and thus ensure the power generation effect of the photovoltaic module. Furthermore, at least a portion of the heat dissipation fins on the side furthest from the substrate 110 are in contact with the bottom of the housing 100, so that some of the heat dissipation fins are located in the high-temperature area of the housing 100. This enhances the local heat dissipation performance within the housing 100, preventing excessively high local temperatures inside the housing 100 and further improving the heat dissipation efficiency of the heat dissipation structure, thereby ensuring the heat dissipation efficiency of the photovoltaic junction box. The shape and number of the heat dissipation fins can be customized according to actual needs.
[0031] In one embodiment, the heat dissipation fins include a first heat dissipation fin 120 and a second heat dissipation fin 111, the first heat dissipation fin 120 protruding from the second heat dissipation fin 111, and at least the first heat dissipation fin 120 is disposed in contact with the bottom of the housing 100, and the second heat dissipation fin 111 is disposed in contact with or spaced from the bottom of the housing 100.
[0032] In this embodiment, the heat dissipation fins can be welded to the substrate 110 and fused into the substrate 110 to ensure stable connection. Alternatively, the first heat dissipation fin 120 can be connected to the substrate 110 by welding alone, while the second heat dissipation fin 111 is integrally formed with the substrate 110 by stamping, thereby improving the production efficiency of the heat dissipation structure. Since the heat dissipation fins include the first heat dissipation fin 120 and the second heat dissipation fin 111, and the first heat dissipation fin 120 protrudes from the second heat dissipation fin 111, the first and second heat dissipation fins 120 and 111 form a staggered structure on the substrate 110. This not only increases the heat dissipation area of the structure but also allows air to flow between the first and second heat dissipation fins 120 and 111, enhancing convective heat dissipation and further improving the heat dissipation efficiency of the photovoltaic junction box.
[0033] The first heat dissipation fin 120 and the second heat dissipation fin 111 each contain a number of fins spaced apart, and each of the first heat dissipation fin 120 and the second heat dissipation fin 111 has a heat dissipation channel.
[0034] By placing the first heat dissipation fin 120 in contact with the bottom of the housing 100, heat inside the housing 100 can be directly transferred to the first heat dissipation fin 120, and then transferred to the external environment through the substrate 110, thereby enhancing the local heat dissipation performance inside the housing 100 and preventing excessively high local temperatures inside the housing 100. Placing the second heat dissipation fin 111 in contact with the bottom of the housing 100 allows heat inside the housing 100 to also be directly transferred to the second heat dissipation fin 111, further enhancing the local heat dissipation performance inside the housing 100. Optionally, the second heat dissipation fins 111 can be spaced at the bottom of the housing 100, creating a flow channel between the first heat dissipation fin 120, the housing 100, and the second heat dissipation fin 111. This suspends the bottom portion of the housing, increasing the heat dissipation area of the housing 100, enhancing the heat dissipation effect, and further improving the heat dissipation efficiency of the photovoltaic junction box.
[0035] Furthermore, the second heat dissipation fins 111 are respectively located on the left and right sides of the first heat dissipation fin 120 to increase the heat dissipation area of the heat dissipation structure. At the same time, a groove is formed between two adjacent second heat dissipation fins 111. When airflow passes through the second heat dissipation fins 111, it can generate vortices in the airflow, thereby further improving the heat dissipation effect of the substrate 110 and ensuring the heat dissipation efficiency of the photovoltaic junction box. The number and shape of the second heat dissipation fins 111 can be set according to actual needs.
[0036] In one embodiment, the bottom of the housing 100 is recessed to form a mounting cavity 160, and the first heat dissipation fins 120 are correspondingly disposed in the mounting cavity 160.
[0037] In this embodiment, since the first heat dissipation fin 120 protrudes from the second heat dissipation fin 111, one end of the first heat dissipation fin 120 extends beyond one side of the substrate 110. A mounting cavity 160 is formed by recessing the bottom of the housing 100 away from the substrate 110, providing a space for the first heat dissipation fin 120 to be disposed within the mounting cavity 160, facilitating subsequent heat dissipation for the housing 100. When the first heat dissipation fin 120 is located within the mounting cavity 160 at the bottom of the housing 100, the heat dissipation area at the bottom of the housing 100 is increased, and the height of the housing 100 relative to the second heat dissipation fin 111 is reduced, preventing the housing 100 from being excessively suspended, thus enhancing the structural stability of the photovoltaic junction box.
[0038] In one embodiment, the mounting cavity 160 is disposed through in a direction parallel to the substrate 110, and the first heat dissipation fin 120 forms a heat dissipation channel with the inner sidewall of the mounting cavity 160.
[0039] In this embodiment, the mounting cavity 160 has a through channel in one direction parallel to the substrate 110. After the first heat dissipation fin 120 is placed in the mounting cavity 160, there is a gap between the first heat dissipation fin 120 and the inner wall of the mounting cavity 160, which serves as a heat dissipation channel. Since the mounting cavity 160 is through in one direction, the heat dissipation channel is also connected in that direction, allowing air to flow in from one end of the heat dissipation channel and out from the other end. The airflow carries away the heat from the first heat dissipation fin 120, thereby reducing the heat of the photovoltaic junction box. The mounting cavity 160 can be through in a front-back direction or a left-right direction parallel to the substrate 110. The extension direction of the heat dissipation channel is parallel to the plane where the first heat dissipation fin 120 is located, that is, the extension direction of the heat dissipation channel is the same as the heat dissipation path direction of the first heat dissipation fin 120 itself. The specific direction can be set according to actual usage requirements.
[0040] In one embodiment, a through hole is provided on the substrate 110 corresponding to the heat dissipation channel.
[0041] In this embodiment, the through holes on the substrate 110 are through-holes, and their positions correspond to heat dissipation channels. This allows the positive lead 12 and negative lead 13 on the photovoltaic module to pass through the substrate 110 via the through holes, thereby electrically connecting to the electrical connection components inside the photovoltaic junction box. Simultaneously, because the through holes correspond to the heat dissipation channels, the positive lead 12 and negative lead 13 are located within the heat dissipation channels, reducing heat on the positive lead 12 and negative lead 13 and further improving safety. The positive lead 12 and negative lead 13 will not block the heat dissipation channels, ensuring that the heat dissipation function of the photovoltaic junction box's heat dissipation structure is not affected.
[0042] After the first heat sink fin 120 is soldered onto the substrate 110, the substrate 110 needs to be cleaned. This can be done by immersing the substrate 110 in warm water at 60°C for 10 minutes, adding sodium carbonate and cyclodextrin to the water to remove oil stains from the substrate 110 surface. Then, a layer of phosphoric acid is applied to the surface of the substrate 110, and after standing for a period of time, rust is removed. Finally, the surface of the substrate 110 is cleaned to remove the phosphoric acid, preparing it for plating.
[0043] In one embodiment, a ceramic layer 140 is also included, which covers the outer surfaces of the substrate 110, the first heat dissipation fin 120, and the second heat dissipation fin 111.
[0044] In this embodiment, the ceramic layer 140 has good insulation and thermal conductivity, which can improve heat dissipation efficiency while ensuring electrical insulation. By covering the outer surface of the substrate 110, the first heat dissipation fin 120, and the second heat dissipation fin 111 with a ceramic layer 140, not only is the electrical insulation performance of the photovoltaic junction box improved, but the heat dissipation effect of the substrate 110 is also enhanced. Specifically, the substrate 110 can be connected to the positive terminal of the power supply at -5°C, and then the substrate 110 can be immersed in an electrolyte and a DC voltage of 180V can be applied to immerse the substrate 110 in the electrolyte for 60 minutes, thereby generating the ceramic layer 140 on the outer surface of the substrate 110, the first heat dissipation fin 120, and the second heat dissipation fin 111. It is understood that the specific parameters of temperature, voltage, and time are exemplary, and the specific parameters can be set according to actual needs without specific limitations.
[0045] Furthermore, after covering the outer surfaces of the substrate 110, the first heat dissipation fin 120, and the second heat dissipation fin 111 with a ceramic layer 140, the substrate 110 is immersed in carbon nanoparticle slurry, and the substrate 110 with the carbon nanoparticle slurry covering its surface is placed in a high-temperature environment of 200°C and baked for 30 minutes, so that the carbon nanoparticles melt and fill the tiny pores of the ceramic layer 140, thereby improving the thermal conductivity of the substrate 110 and improving the aging resistance of the substrate 110, which can extend the service life of the photovoltaic junction box.
[0046] In one embodiment, a reflective layer 150 is also included, which covers the outer surface of the ceramic layer 140.
[0047] In this embodiment, a reflective layer 150 is also covered on the outer surface of the ceramic layer 140. The reflective layer 150 can be applied to the outer surface of the ceramic layer 140 by spraying, electroplating, or vacuum coating. The reflective layer 150 can reflect thermal radiation from the environment, reduce the heat absorbed by the photovoltaic junction box, and further improve the heat dissipation effect of the photovoltaic junction box. The reflective layer 150 can be a black nickel coating.
[0048] On the other hand, this utility model also provides a photovoltaic module, including: a backplate 10, on which lead wires are included; a photovoltaic junction box, wherein the heat dissipation structure of the photovoltaic junction box is disposed on the backplate 10, and the lead wires are electrically connected to the photovoltaic junction box.
[0049] In this embodiment, the photovoltaic module includes a backplate 10 and a photovoltaic junction box disposed on the backplate 10. The backplate 10 supports and protects other electrical components in the photovoltaic module and also serves as the mounting base for the photovoltaic junction box. The photovoltaic junction box is mounted on the backplate 10, and its heat dissipation structure is located on the backplate 10 to achieve heat dissipation for the box 100. Lead wires are also provided on the backplate 10, which are electrically connected to the photovoltaic junction box. During operation, the electrical energy generated by the photovoltaic module is transmitted to the photovoltaic junction box through the lead wires, and then output to the external circuit through the photovoltaic junction box. The electrical connection components inside the photovoltaic junction box generate heat during operation, which can be dissipated through the substrate 110 and the first heat dissipation fins 120, ensuring the normal operating temperature of the photovoltaic junction box and extending the service life of the photovoltaic module.
[0050] Furthermore, the leads include a positive lead 12 and a negative lead 13, used to connect the positive and negative terminals of the photovoltaic module to the photovoltaic junction box. A through-hole is provided on the substrate 110, corresponding one-to-one with the positive lead 12 and the negative lead 13. The diameter of the through-hole is slightly larger than the diameter of the lead, facilitating the passage of the positive lead 12 and the negative lead 13 through the through-hole. By installing the positive lead 12 and the negative lead 13 one-to-one in the through-hole, the positive lead 12 and the negative lead 13 pass through the substrate 110 and extend into the housing 100, connecting the positive lead 12 and the negative lead 13 to the electrical connection components inside the housing 100, thereby realizing the transmission of electrical energy.
[0051] In one embodiment, a thermally conductive grease layer 11 is provided between the backplate 10 and the substrate 110, and the thermally conductive grease layer 11 is located around the lead wire.
[0052] In this embodiment, the thermally conductive silicone grease layer 11 possesses excellent thermal conductivity and insulation properties, which can improve heat transfer efficiency while ensuring electrical insulation safety. By coating the thermally conductive silicone grease layer 11 onto the backplate 10, the thermally conductive silicone grease layer 11 covers the peripheral area of the lead wires, and the area of the thermally conductive silicone grease layer 11 is slightly larger than the area of the substrate 110. By placing the thermally conductive silicone grease layer 11 between the backplate 10 and the substrate 110, the lower surface of the substrate 110 and the upper surface of the backplate 10 are in contact with the thermally conductive silicone grease layer 11, thereby forming a good heat conduction path and reducing heat concentration near the photovoltaic module lead wires. The placement of the thermally conductive silicone grease layer 11 not only improves heat transfer efficiency but also fills the gap between the substrate 110 and the backplate 10, eliminating the heat insulation effect of the air layer and further improving heat dissipation. Simultaneously, the thermally conductive silicone grease layer 11 also has a certain buffering effect, which can reduce the thermal stress of the photovoltaic module during temperature changes, improving the reliability and service life of the photovoltaic module.
[0053] In one embodiment, a sealant 130 is also included, which is located at the junction of the photovoltaic junction box and the backplate 10.
[0054] In this embodiment, sealant 130 can be applied to the lower edge of the photovoltaic junction box to form a closed or semi-closed sealing ring. When the box body 100 is installed on the back plate 10, the sealant 130 is deformed under pressure, thereby filling the gap between the box body 100 and the back plate 10 to form a seal. The application of sealant 130 improves the waterproof and weather-resistant performance of the photovoltaic junction box, prevents moisture and dust from entering the interior of the photovoltaic junction box, protects the internal electrical connection components, and extends the service life of the photovoltaic module. At the same time, sealant 130 also has a certain buffering effect, which can reduce the thermal stress of the photovoltaic module during temperature changes and improve the reliability of the photovoltaic module.
[0055] like Figures 3 to 5 As shown, relevant tests were performed on the photovoltaic junction box provided by this utility model; the substrate 110 of the photovoltaic junction box was subjected to a salt spray test for 1000 hours, and there were no corrosion marks on the surface of the substrate 110, while conventional metal plates would rust through after 500 hours.
[0056] like Figure 3 As shown, the actual temperature of the photovoltaic junction box under short-circuit conditions was tested; A is the photovoltaic junction box provided by this utility model, whose maximum temperature is below 153℃; B is a conventional junction box, whose maximum temperature reaches 472℃; the melting point of solder is generally 183℃, therefore, conventional junction boxes have the risk of melting and thus the risk of spontaneous combustion.
[0057] like Figure 4As shown, the actual temperature of the photovoltaic junction box under normal operating conditions was tested; A is the photovoltaic junction box provided by this utility model, with a temperature of 29℃; B is a conventional junction box, with a temperature of 48℃. The photovoltaic junction box provided by this utility model has an actual temperature 19℃ lower than that of the conventional junction box under normal operating conditions.
[0058] like Figure 5 As shown, A is the photovoltaic junction box provided by this utility model, with a power generation of 738.76 kWh; B is a conventional junction box, with a power generation of 730 kWh. The photovoltaic junction box provided by this utility model increases the power generation by 1.2% compared to the conventional junction box.
[0059] In summary, the photovoltaic junction box provided by this utility model has better performance than conventional junction boxes in terms of maximum temperature under short-circuit conditions, actual operating temperature under normal operating conditions, and power generation.
[0060] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.
Claims
1. A photovoltaic junction box, characterized by, include: The housing (100) and the heat dissipation structure located below the housing (100); The heat dissipation structure includes a substrate (110) and heat dissipation fins disposed on the substrate (110), with at least a portion of the heat dissipation fins on the side away from the substrate (110) contacting the bottom of the housing (100).
2. The photovoltaic junction box of claim 1, wherein, The heat dissipation fins include a first heat dissipation fin (120) and a second heat dissipation fin (111). The first heat dissipation fin (120) protrudes from the second heat dissipation fin (111), and at least the first heat dissipation fin (120) is disposed in contact with the bottom of the box body (100), while the second heat dissipation fin (111) is disposed in contact with or spaced from the bottom of the box body (100).
3. The photovoltaic junction box of claim 2, wherein, The bottom of the box (100) is recessed to form a mounting cavity (160), and the first heat dissipation fin (120) is correspondingly disposed in the mounting cavity (160).
4. The photovoltaic junction box of claim 3, wherein, The mounting cavity (160) is through-type in one direction parallel to the substrate (110), and the first heat dissipation fin (120) forms a heat dissipation channel with the inner wall of the mounting cavity (160).
5. The photovoltaic junction box of claim 4, wherein, The substrate (110) has a through hole corresponding to the heat dissipation channel.
6. The photovoltaic junction box of claim 2, wherein, It also includes a ceramic layer (140) that covers the outer surfaces of the substrate (110), the first heat dissipation fin (120), and the second heat dissipation fin (111).
7. The photovoltaic junction box of claim 6, wherein, It also includes a reflective layer (150) that covers the outer surface of the ceramic layer (140).
8. A photovoltaic module, characterized by, include: Back plate (10), the back plate (10) includes lead wires; The photovoltaic junction box as described in any one of claims 1 to 7, wherein the heat dissipation structure of the photovoltaic junction box is disposed on the back plate (10), and the lead wire is electrically connected to the photovoltaic junction box.
9. The photovoltaic module of claim 8, wherein, A thermally conductive silicone grease layer (11) is provided between the back plate (10) and the substrate (110), and the thermally conductive silicone grease layer (11) is located on the periphery of the lead wire.
10. The photovoltaic module of claim 8, wherein, It also includes a sealant (130) located at the junction of the photovoltaic junction box and the backplate (10).