Heat conducting plate and photovoltaic photo-thermal assembly

Abstract

The utility model discloses a heat conducting plate and a photovoltaic photo-thermal assembly, the heat conducting plate is made of composite ceramic materials, including aluminum nitride, silicon carbide and the like, and has high heat conductivity, low density, excellent electrical insulation performance and corrosion resistance. Grooves, such as linear grooves or snakelike grooves, used for embedding the flow channels are formed in the heat conducting plates, and efficient heat exchange is achieved by forming an integral structure with the flow channels. The photovoltaic photo-thermal assembly comprises a photovoltaic assembly, a heat conduction plate, a flow channel, a heat preservation material and a back plate which are of a layered structure and attached to one another. The heat-conducting plate effectively conducts waste heat generated by power generation of the photovoltaic module to the flow channel, the module temperature is reduced, and the power generation efficiency is improved. Meanwhile, the composite ceramic material avoids the capacitance effect, the system stability is improved, the service life is prolonged, the heat exchange area is increased through optimal design of the flow channel, the energy utilization efficiency is improved, and the application scene is expanded.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic technology, and in particular to heat-conducting plates and photovoltaic thermal modules. Background Technology

[0002] Photovoltaic-thermal (PVT) technology refers to a combined photovoltaic (PV) and solar thermal power generation technology, which integrates PV power generation with solar thermal utilization. PVT achieves dual energy utilization by simultaneously utilizing both solar thermal and photovoltaic effects, further improving the overall efficiency of the PV system. In PVT technology, PV modules not only generate electricity but also transfer heat to thermal energy storage devices or other utilization equipment via heat exchangers behind the modules, achieving the collection and utilization of solar and thermal energy. In this way, PVT systems can simultaneously generate electricity and heat, improving overall energy efficiency.

[0003] The current structure of PVT modules is as follows, where the thermally conductive substrate is made of metal, typically aluminum. Aluminum has a thermal conductivity of 237 W / m·K, with industrially produced versions having a thermal conductivity of 120-240 W / m·K, a density of 2.7 g / cm³, and an electrical conductivity of 37.7 MS / m. While traditional aluminum possesses good thermal conductivity and low density, it also exhibits some electrical conductivity, potentially generating capacitance that can affect module stability and power generation efficiency. When laminated onto the back of the photovoltaic module, it may create a capacitive effect, significantly reducing the module's insulation performance, impacting long-term reliability, and leading to power reduction.

[0004] Therefore, we propose heat-conducting plates and photovoltaic thermal modules. Utility Model Content

[0005] In response to the shortcomings of the existing production technologies, the applicant provides heat-conducting plates and photovoltaic thermal modules. By adopting composite ceramic material heat-conducting plates and optimized flow channel structures, the energy utilization efficiency, reliability, and lifespan of photovoltaic systems are significantly improved, while expanding their application scenarios.

[0006] The technical solution adopted in this utility model is as follows:

[0007] A heat-conducting plate for use in a photovoltaic thermal module includes a heat-conducting plate made of ceramic material. The heat-conducting plate is provided with a groove structure and / or a protrusion structure for fitting a flow channel, and forms an integral structure with the flow channel through the groove, so as to conduct the waste heat generated by the photovoltaic module to the flow channel, thereby reducing the surface temperature of the module and improving the power generation efficiency.

[0008] As a further improvement to the above technical solution:

[0009] The groove includes two parallel straight grooves with a radial cross-section of circular arc, which are used to accommodate the manifold of the flow channel, and multiple parallel branch pipes are vertically arranged between the two manifolds.

[0010] Both the branch pipe and the manifold have circular radial cross-sections. The diameter of the branch pipe is smaller than that of the manifold, and the axis of the branch pipe and the axis of the manifold are on the same horizontal plane.

[0011] The depth H1 of the straight groove is the same as the radius of the manifold, and the maximum depth of the straight groove is the same as the radius of the manifold.

[0012] The thickness of the section of the heat-conducting plate located between the two straight grooves is less than the thickness of the other sections of the heat-conducting plate, and the lower end face of the heat-conducting plate is horizontally set. The thickness difference between the two is the radius of the branch pipe, so as to ensure that the lower end face of the flow channel is in full contact with the heat-conducting plate.

[0013] The raised structure includes a pad that is connected to one side of the heat-conducting plate near the branch pipe. The pad is used to support the branch pipe and transfer heat with it.

[0014] The heat-conducting plate may be made of metal, ceramic or inorganic materials. Metal materials may include aluminum, copper or stainless steel plates. Inorganic materials may include graphite or special glass. The ceramic material may be a composite ceramic material, including aluminum nitride ceramic, silicon carbide ceramic, boron nitride ceramic, alumina ceramic or silicon nitride ceramic.

[0015] The flow channel is a serpentine pipe, and a serpentine groove is formed on the heat-conducting plate. The radial cross-section of the serpentine pipe is circular, and the radial cross-section of the serpentine groove is semi-circular. The diameter of the radial cross-section of the serpentine groove is the same as the diameter of the radial cross-section of the serpentine pipe.

[0016] The protruding structure includes a pad, which is fixed on a section of the heat-conducting plate near the branch pipe 202. The pad is also provided with a groove that cooperates with the branch pipe.

[0017] The pad has arc-shaped grooves on both sides that mate with the manifold.

[0018] The pad is provided with multiple sets of upright plates, each set consisting of two upright plates, with the two upright plates clamping on both sides of the branch pipe.

[0019] The heat-conducting plate is provided with multiple sets of vertical plates, each set consisting of two plates, with the two plates clamped on both sides of the branch pipe.

[0020] The branch pipe is made of a relatively soft material and is connected to the heat-conducting plate through a connecting medium, which includes adhesive and welding agent. A gasket is also provided at the connection between the heat-conducting plate and the manifold and the branch pipe.

[0021] A photovoltaic thermal module includes the aforementioned heat-conducting plate, and further includes: a photovoltaic module, a flow channel, a thermal insulation material, and a back plate, wherein the heat-conducting plate and the flow channel are interlocked to form an integral whole and are located below the photovoltaic module, the thermal insulation material is located at the lower end of the integral flow channel and the heat-conducting plate, and the back plate is located below the thermal insulation material.

[0022] The beneficial effects of this utility model are as follows:

[0023] This invention features a compact and rational structure, and is easy to operate. By employing a composite ceramic heat-conducting plate and an optimized flow channel structure, it significantly improves the energy utilization efficiency, reliability, and lifespan of the photovoltaic system, while also expanding its application scenarios. The composite ceramic heat-conducting plate not only possesses thermal conductivity and density comparable to metal heat-conducting substrates, but also exhibits excellent electrical insulation properties, corrosion resistance, and chemical stability, effectively avoiding capacitive effects and improving system stability and lifespan. The optimized flow channel structure increases the heat exchange area, enabling more efficient transfer and utilization of waste heat, further enhancing energy utilization efficiency. Furthermore, the high-temperature and chemical stability of the ceramic material allows the photovoltaic system to operate in a wider range of environments, meeting the needs of different application scenarios. In summary, the technical solution of this embodiment provides an effective solution for the improvement and expansion of photovoltaic systems, with significant beneficial effects and broad application prospects.

[0024] In addition, this utility model also has the following advantages:

[0025] This invention achieves efficient collection and utilization of waste heat from photovoltaic modules by employing a heat-conducting plate and an optimized flow channel structure. In traditional PVT systems, waste heat recovery efficiency is limited due to the capacitive effect and thermal conductivity limitations of the metal heat-conducting substrate. This solution uses a composite ceramic heat-conducting plate, whose thermal conductivity is comparable to that of aluminum plates, but whose electrical conductivity is extremely low, making it almost an insulator. This effectively avoids the capacitive effect and ensures the stability and power generation efficiency of the photovoltaic modules. Simultaneously, the carefully designed grooves and flow channel structure on the heat-conducting plate (such as the combination of straight grooves with manifolds and branch pipes, and the interlocking of serpentine grooves with serpentine pipes) increase the heat exchange area, allowing waste heat to be transferred more quickly and fully to the cooling medium in the flow channel for effective utilization. This design not only reduces the operating temperature of the photovoltaic modules and improves their photoelectric conversion efficiency but also achieves waste heat resource recovery, significantly improving the energy utilization efficiency of the entire photovoltaic system.

[0026] The heat-conducting plate in this invention uses composite ceramic materials such as aluminum nitride and silicon carbide. These materials possess excellent corrosion resistance and chemical stability, maintaining stable performance under complex and variable environmental conditions. Compared to traditional metal heat-conducting substrates, ceramic materials are less susceptible to oxidation and corrosion, thus extending the service life of the heat-conducting plate. Furthermore, the high insulation performance of ceramic materials avoids the capacitance effect, reducing potential internal failure points and improving system safety. Simultaneously, the optimized flow channel structure (such as the rational layout of branch pipes and manifolds, and the use of serpentine pipes) ensures more uniform heat distribution, reducing the risk of localized overheating and further enhancing system reliability. These improvements enable the entire photovoltaic thermal module to maintain efficient and stable operation over long periods, significantly improving system reliability and lifespan.

[0027] This invention not only improves the energy efficiency and reliability of photovoltaic systems but also expands their application scenarios. Due to the higher operating temperature range and better chemical stability of the heat-conducting plate, photovoltaic thermal modules can operate in extreme or special environments, such as high-temperature, high-humidity, and highly corrosive industrial environments. Furthermore, by adjusting the flow channel structure (e.g., using different forms of grooves and pipe layouts), it can flexibly adapt to the needs of different application scenarios. For example, in applications requiring a compact structure, straight grooves can be combined with manifolds and branch pipes; in applications requiring a larger heat exchange area, serpentine grooves can be combined with serpentine pipes. This flexibility gives this invention a wider range of application prospects and can meet the needs of photovoltaic systems in different fields. Attached Figure Description

[0028] Figure 1 This is an exploded view of the present invention.

[0029] Figure 2 This is an exploded view of the connection structure between the flow channel and the heat-conducting plate in Embodiment 1 of this utility model.

[0030] Figure 3 This is an exploded view of the connection structure between the flow channel and the heat-conducting plate in Embodiment 2 of this utility model.

[0031] Figure 4 This is a top view of the connection structure between the flow channel and the heat-conducting plate in Embodiment 1 of this utility model.

[0032] Figure 5 for Figure 4 Sectional view of section JJ.

[0033] Figure 6 This is a top view of the connection structure between the flow channel and the heat-conducting plate in Embodiment 3 of this utility model.

[0034] Figure 7 for Figure 6 Sectional view of section KK.

[0035] Figure 8 This is a perspective view of the connection structure between the flow channel and the heat-conducting plate in Embodiment 4 of this utility model.

[0036] Figure 9 for Figure 8 A magnified view of the central X-section.

[0037] Figure 10 This is a perspective view of the connection structure between the flow channel and the heat-conducting plate in Embodiment 5 of this utility model.

[0038] Figure 11 for Figure 11 A magnified view of the middle Y region.

[0039] Figure 12 This is a perspective view of the connection structure between the flow channel and the heat-conducting plate in Embodiment Six of this utility model.

[0040] Figure 13 for Figure 12 A magnified view of the central Z-section.

[0041] in:

[0042] 100. Photovoltaic module; 200. Flow channel; 300. Heat-conducting plate; 400. Insulation material; 500. Backsheet;

[0043] 201. Manifold; 202. Branch pipe; 203. Serpentine pipe; 204. Vertical plate; 301. Straight groove; 302. Serpentine groove; 303. Gasket; 304. Gasket strip. Detailed Implementation

[0044] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0045] Example 1

[0046] like Figure 2 As shown, this embodiment discloses a heat-conducting plate, which includes a heat-conducting plate 300. The heat-conducting plate 300 is provided with a groove structure or a protrusion structure for fitting into the flow channel 200, and the heat-conducting plate 300 forms an integral structure with the flow channel 200 through the groove structure. This design allows the heat-conducting plate and the flow channel to be tightly integrated, which not only enhances the stability of the structure but also effectively improves the heat conduction efficiency. By directly embedding the flow channel into the groove of the heat-conducting plate, thermal resistance is reduced, allowing heat to be transferred to the flow channel more quickly and thus carried away, which helps to keep the operating temperature of the photovoltaic module within the optimal range and improves the overall power generation efficiency.

[0047] In this embodiment, the heat-conducting plate 300 is used to conduct the waste heat generated by the photovoltaic module 100 to the flow channel 200, and carry it out through the flow channel 200, thereby reducing the surface temperature of the module and improving the power generation efficiency. During the power generation process, due to the limitation of photoelectric conversion efficiency, some energy is lost in the form of heat. If this waste heat accumulates inside the module, it will cause the module temperature to rise, thus affecting its photoelectric conversion efficiency.

[0048] Specifically, the heat-conducting plate 300 has two parallel straight grooves 301 with a circular arc-shaped radial cross-section. A manifold 201 corresponding to the straight grooves 301 is provided on the flow channel 200, and multiple branch pipes 202 are provided between the two manifolds 201. In this embodiment, the multiple branch pipes 202 are arranged parallel to the two manifolds 201. The radial cross-sections of both the branch pipes 202 and the manifolds 201 are circular. The diameter of the branch pipes 202 is smaller than that of the manifolds 201, and the axis of the branch pipes 202 is on the same horizontal plane as the axis of the manifolds 201. This makes the flow channel distribution on the heat-conducting plate more uniform, which helps to evenly transfer heat across the entire heat-conducting plate. The manifolds serve as the main heat transfer channels, while the branch pipes further increase the heat transfer area, allowing heat to be carried away more quickly. Simultaneously, the fact that the axes of the branch pipes and the manifolds are on the same horizontal plane helps to maintain the balance of the flow channel and avoids deformation or damage to the flow channel due to factors such as gravity.

[0049] The depth H1 of the straight groove 301 is half the diameter D1 of the manifold 201, which is the same as the radius of the manifold 201. The maximum depth of the straight groove 301 is also the same as the radius of the manifold 201, designed to accommodate the manifold 201. This ensures a tight fit between the manifold and the straight groove, reducing thermal resistance and improving heat transfer efficiency. Simultaneously, the maximum depth of the straight groove being the same as the radius of the manifold allows the manifold to be completely embedded in the straight groove, enhancing structural stability.

[0050] In this embodiment, the thickness of the section of the heat-conducting plate 300 between the two straight grooves 301 is less than the thickness of the other sections of the heat-conducting plate 300, and the lower end face of the heat-conducting plate 300 is horizontally positioned. The thickness difference between the two sections is the radius of the branch pipe 202. This ensures that the lower end face of the flow channel 200 is in full contact with the heat-conducting plate 300, increasing the contact area and improving the heat collection efficiency. It also ensures that the upper end face of the manifold 201 in the flow channel 200 is on the same horizontal plane, facilitating connection with other components. In this embodiment, the other component is the photovoltaic module 100. (This design makes the contact between the heat-conducting plate and the flow channel closer, increasing the heat conduction area and thus improving the heat collection efficiency. At the same time, maintaining the horizontal position of the upper end face of the flow channel facilitates connection with other components, such as the photovoltaic module, improving the integration and stability of the entire system.)

[0051] In another embodiment, such as Figure 4 and Figure 5 As shown, in this embodiment, the heat-conducting plate 300 is also provided with a groove for accommodating the branch pipe 202, and the depth of the groove is the same as half of the diameter D2 of the branch pipe 202, thereby greatly increasing the contact area between the heat-conducting plate 300 and the branch pipe 202 and improving the heat conduction effect.

[0052] In another embodiment, the manifold 201 and the branch pipe 202 have the same diameter. In this embodiment, the thickness of the section of the heat-conducting plate 300 between the two straight grooves 301 is less than the thickness of other sections of the heat-conducting plate 300, and the lower end face of the heat-conducting plate 300 is horizontally positioned. The thickness difference between the two sections is the radius of the branch pipe 202. That is, the overall thickness of the two straight grooves 301 and the section of the heat-conducting plate 300 between the two straight grooves 301 is the same. This ensures that the lower end face is in full contact with the heat-conducting plate 300, while also improving the heat exchange effect between the upper end of the flow channel 200 and the photovoltaic module 100. Simplifying the flow channel structure and making the manifold and branch pipe have the same diameter helps reduce processing costs and improve processing efficiency. At the same time, maintaining the same overall thickness not only enhances the stability of the structure but also helps improve the heat exchange effect between the flow channel and the photovoltaic module.

[0053] In this embodiment, the heat-conducting plate 300 is made of composite ceramic materials, including aluminum nitride (AlN) ceramics, silicon carbide (SiC) ceramics, boron nitride (BN) ceramics, alumina (Al2O3) ceramics, and silicon nitride (Si3N4) ceramics. Taking aluminum nitride ceramics as an example, its thermal conductivity is 170-260 W / m·K, the industrially produced thermal conductivity is 180-230 W / m·K, its density is 3.25 g / cm3, its electrical conductivity is 10-12 S / m, it is almost an insulator, and its molding temperature is 1800-2200℃. Therefore, composite ceramic materials possess excellent electrical insulation properties, corrosion resistance and chemical stability, and a wider operating temperature range. The selection of composite ceramic materials enables the heat-conducting plate to not only have excellent thermal conductivity but also outstanding electrical insulation properties, corrosion resistance, and chemical stability. These properties allow the heat-conducting plate to remain stable in harsh working environments, improving the reliability and lifespan of the equipment. Simultaneously, the wider operating temperature range allows the heat-conducting plate to be suitable for a wider range of applications.

[0054] In this embodiment, the heat-conducting plate 300 is made of metal materials, including aluminum plates, copper plates, stainless steel plates, and other metal materials with waterproof and thermally conductive properties, which are easy to process.

[0055] In this embodiment, the heat-conducting plate 300 is made of inorganic materials, including graphite and special glass.

[0056] In this embodiment, the heat-conducting plate 300 uses a composite ceramic material instead of an aluminum plate as the heat-conducting substrate. It possesses the same thermal conductivity and density (weight) as the aluminum plate, while also exhibiting high insulation properties, thus resolving the capacitive effect caused by the conductivity of the aluminum plate. It not only boasts excellent heat dissipation performance but also overcomes the shortcomings of traditional heat dissipation materials, making it suitable for various complex application scenarios and improving the overall performance and reliability of the equipment. Using a composite ceramic material instead of an aluminum plate not only maintains the advantages of aluminum in terms of thermal conductivity and density but also overcomes the capacitive effect problem caused by the conductivity of the aluminum plate. This improvement makes the heat-conducting plate safer and more reliable while maintaining efficient heat dissipation, making it suitable for more complex application scenarios.

[0057] In another embodiment, the heat-conducting plate 300 can also be made of metal, which is convenient.

[0058] Choosing ceramic materials with high thermal conductivity and low coefficient of thermal expansion (such as aluminum nitride and beryllium oxide), and extending this to specific material ratios (AlN-SiC ratio), can replace traditional aluminum heatsinks. By selecting ceramic materials with high thermal conductivity and low coefficient of thermal expansion, and by implementing reasonable material ratios, the performance of the heatsink can be further optimized. For example, a composite of aluminum nitride and silicon carbide can combine the advantages of both, improving the overall performance of the heatsink. This design of material selection and ratio makes the heatsink more suitable for practical applications.

[0059] Example 2

[0060] like Figure 3 As shown, this embodiment discloses another type of heat-conducting plate. Unlike Embodiment 1, the flow channel 200 in this embodiment is a serpentine structure pipe, and a serpentine groove 302 is formed on the heat-conducting plate 300. The radial cross-section of the serpentine pipe 203 is circular, and the radial cross-section of the serpentine groove 302 is semi-circular. The diameter of this arc is the same as the diameter of the radial cross-section of the serpentine pipe 203, thereby better fitting the flow channel 200, increasing the contact area, and improving the heat collection effect. The serpentine flow channel design makes the heat transfer path on the heat-conducting plate more tortuous, increasing the heat transfer distance and helping the heat to be carried away more fully. At the same time, the close fit between the serpentine groove and the serpentine pipe further increases the contact area and enhances the heat conduction effect.

[0061] Example 3

[0062] like Figure 6 and Figure 7As shown, this embodiment discloses another type of heat-conducting plate. The difference from embodiment 1 is that a pad 303 is connected to a section of the heat-conducting plate 300 near the branch pipe 202. The pad 303 is a raised structure that allows the branch pipe 202 to disengage from the pad 303 and increases the disengagement area. At the same time, a groove that cooperates with the branch pipe 202 can be opened on the pad 303 to further increase the disengagement area.

[0063] In addition, arc-shaped grooves that mate with manifold 201 are provided on both sides of the pad 303 to increase the contact area with manifold 201.

[0064] Example 4

[0065] like Figure 8 and Figure 9 As shown, this embodiment discloses another heat-conducting plate. The difference from embodiment 3 is that multiple sets of upright plates 204 are provided on the pad 303. Each set of upright plates 204 consists of two plates, and the two upright plates 204 are sandwiched on both sides of the branch pipe 202 to transfer the heat of the branch pipe 202.

[0066] Example 5

[0067] like Figure 10 and Figure 11 As shown, this embodiment discloses another heat-conducting plate. Unlike embodiment 4, this embodiment does not have a pad 303, and the upright plate 204 is directly placed on the heat-conducting plate 300. The upright plate 204 is still clamped on both sides of the branch pipe 202, which increases the heat-conducting area. The height of the upright plate 204 is greater than or equal to the maximum height of the branch pipe 202.

[0068] Example 6

[0069] like Figure 12 and Figure 13 As shown, this embodiment discloses another type of heat-conducting plate 300. The difference from embodiment 1 is that the branch pipe 202 in this embodiment is made of a softer material and is connected to the heat-conducting plate 300 through a connecting medium. The heat-conducting medium includes materials such as glue and welding agent. At the same time, a pad 304 is provided at the connection between the manifold 201 and the branch pipe 202 of the heat-conducting plate 300 to support and transfer heat.

[0070] Example 7

[0071] like Figure 1As shown, this embodiment discloses a photovoltaic-thermal module, whose structure includes the heat-conducting plate as in Embodiments 1 and 2, and also includes a photovoltaic module 100, a flow channel 200, a thermal insulation material 400, and a backplate 500. The photovoltaic-thermal module integrates a photovoltaic module and a heat-conducting plate, realizing the dual functions of photoelectric conversion and heat utilization. By dispersing the waste heat generated by the photovoltaic module through the flow channel, not only is the power generation efficiency of the photovoltaic module improved, but also the waste heat is recovered and utilized.

[0072] Specifically, the aforementioned components are layered and bonded together to form an integral structure. This layered design ensures a tight fit between the components, enhancing the stability and reliability of the entire assembly. Simultaneously, this structure facilitates heat transfer between the components, improving overall efficiency.

[0073] The photovoltaic (PV) module, located at the top layer, absorbs sunlight and generates electricity. Commonly available PV modules are made of monocrystalline silicon, heterojunction, and thin-film materials such as cadmium telluride (CdTe) and copper indium gallium selenide (CIGS). As the core component of the entire system, the PV module is responsible for converting solar energy into electrical energy. Each common PV module material has its advantages and disadvantages: monocrystalline silicon is highly efficient but expensive; heterojunction modules are highly efficient and suitable for bifacial power generation; thin-film materials are flexible but relatively inefficient; and CdTe and CIGS have different spectral response characteristics. Selecting the appropriate material based on the specific application scenario can optimize the performance of the entire system.

[0074] The flow channel 200 and the heat-conducting plate 300 are interlocked to form a single unit, both located below the photovoltaic module 100 and embedded in a groove on the heat-conducting plate 300. In this embodiment, the flow channel 200 is typically a copper tube grid or a serpentine pipe 203. Its main function is to transfer and absorb the waste heat generated by the photovoltaic cells and convert it into usable thermal energy. The tight connection between the flow channel and the heat-conducting plate allows heat to be efficiently transferred to the cooling medium in the flow channel and carried away. The design of the copper tube grid or serpentine pipe is optimized according to the specific application scenario to improve heat transfer efficiency.

[0075] In this embodiment, the heat-conducting plate 300 is in contact with the photovoltaic module 100 to transfer the heat of the photovoltaic module 100, while the flow channel 200 is located at the lower end of the heat-conducting plate 300 and indirectly receives the heat of the photovoltaic module 100.

[0076] The insulation material 400 is located at the lower end of the flow channel 200 and the heat-conducting plate 300. Its main function is to reduce heat loss and prevent condensation inside the module in cold environments, thus protecting the photovoltaic cells from damage. Common materials include glass wool and rock wool. The use of insulation material helps reduce heat loss to the outside, improving the overall system's thermal efficiency. Simultaneously, in cold environments, the insulation material prevents condensation from forming inside the module due to excessively low temperatures, thereby protecting the photovoltaic cells from damage.

[0077] The backplate 500, located below the insulation material 400, primarily functions as a sealant, providing moisture and water protection, dust and dirt prevention, and ideally possesses excellent weather resistance and thermal conductivity. Therefore, common materials include aluminum alloy, galvanized steel sheet, and polyvinylidene fluoride (PVC). As the outermost layer of the entire assembly, the backplate is responsible for protecting internal components from the influence of the external environment. The selection of materials with excellent weather resistance and thermal conductivity allows the backplate to withstand the corrosive effects of harsh weather conditions while also facilitating heat transfer, thereby improving the efficiency of the entire system.

[0078] In another embodiment, the heat-conducting plate 300 may also be made of metal.

[0079] The above description is an explanation of the present utility model and not a limitation thereof. The scope of the present utility model is defined by the claims. Within the protection scope of the present utility model, any form of modification may be made.

Claims

1. A heat-conducting plate for use in photovoltaic thermal modules, characterized in that: The device includes a heat-conducting plate, which has a groove structure and / or a protrusion structure for fitting into the flow channel, and forms an integral structure with the flow channel through the groove structure and / or the protrusion structure, so as to conduct the waste heat generated by the photovoltaic module to the flow channel.

2. The heat-conducting plate according to claim 1, characterized in that, The groove structure includes two parallel straight grooves, the radial cross-section of which is arc-shaped, for accommodating the manifold of the flow channel, and multiple parallel branch pipes are vertically arranged between the two manifolds.

3. The heat-conducting plate according to claim 2, characterized in that, Both the branch pipe and the manifold have circular radial cross-sections. The diameter of the branch pipe is smaller than that of the manifold, and the axis of the branch pipe and the axis of the manifold are on the same horizontal plane.

4. The heat-conducting plate according to claim 2, characterized in that, The depth H1 of the straight groove is the same as the radius of the manifold, and the maximum depth of the straight groove is the same as the radius of the manifold. The thickness of the section of the heat-conducting plate located between the two straight grooves is less than the thickness of the other sections of the heat-conducting plate, and the lower end face of the heat-conducting plate is horizontally set. The thickness difference between the two is the radius of the branch pipe, so as to ensure that the lower end face of the flow channel is in full contact with the heat-conducting plate.

5. The heat-conducting plate according to claim 2, characterized in that, The protruding structure includes a pad, which is connected to one side of the heat-conducting plate near the branch pipe. The pad is used to support the branch pipe and transfer heat with it.

6. The heat-conducting plate according to claim 1, characterized in that, The flow channel is a serpentine pipe, and a serpentine groove is formed on the heat-conducting plate. The radial cross-section of the serpentine pipe is circular, and the radial cross-section of the serpentine groove is semi-circular. The diameter of the radial cross-section of the serpentine groove is the same as the diameter of the radial cross-section of the serpentine pipe.

7. The heat-conducting plate according to claim 1, characterized in that, The heat-conducting plate may be made of metal, ceramic or inorganic materials. Metal materials may include aluminum, copper or stainless steel plates. Inorganic materials may include graphite or special glass. The ceramic material may be a composite ceramic material, including aluminum nitride ceramic, silicon carbide ceramic, boron nitride ceramic, alumina ceramic or silicon nitride ceramic.

8. The heat-conducting plate according to claim 1, characterized in that, The protruding structure includes a pad, which is fixed on a section of the heat-conducting plate near the branch pipe. The pad is also provided with a groove that cooperates with the branch pipe.

9. The heat-conducting plate according to claim 8, characterized in that, The pad has arc-shaped grooves on both sides that mate with the manifold.

10. The heat-conducting plate according to claim 8, characterized in that, The pad is provided with multiple sets of upright plates, each set consisting of two upright plates, with the two upright plates clamping on both sides of the branch pipe.

11. The heat-conducting plate according to claim 1, characterized in that, The heat-conducting plate is provided with multiple sets of vertical plates, each set consisting of two plates, with the two plates clamped on both sides of the branch pipe.

12. The heat-conducting plate according to claim 10, characterized in that, The branch pipe is made of a relatively soft material and is connected to the heat-conducting plate through a connecting medium, which includes adhesive and welding agent. A gasket is also provided at the connection between the heat-conducting plate and the manifold and the branch pipe.

13. A photovoltaic thermal module, comprising a heat-conducting plate as described in any one of claims 1-12, characterized in that: Also includes: The photovoltaic module, flow channel, insulation material, and backplate are provided, wherein the heat-conducting plate and the flow channel are interlocked to form a whole and are located below the photovoltaic module, the insulation material is located at the lower end of the flow channel and the heat-conducting plate as a whole, and the backplate is located below the insulation material.

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