Photovoltaic module

Abstract

The utility model relates to the technical field of photovoltaic module heat dissipation, and discloses a packaging front plate, a battery piece layer and a heat dissipation back plate which are sequentially laminated, the heat dissipation back plate is provided with a hollow heat dissipation cavity, two sides of the heat dissipation cavity are respectively provided with an inlet and an outlet, a plurality of heat dissipation channels are arranged in the heat dissipation cavity, and two ends of each heat dissipation channel are respectively communicated with the inlet and the outlet. According to the photovoltaic assembly provided by the utility model, through the hollow heat dissipation cavity and the plurality of internal heat dissipation channels, an efficient heat dissipation path is provided for the photovoltaic assembly. Compared with a traditional heat dissipation mode that a fan or a cooling water pipe and other assemblies are additionally arranged, the heat dissipation cavity and the heat dissipation channel are integrated in the heat dissipation backboard, the external size of the photovoltaic assembly is not additionally increased, the structure is compact, the occupied space is small, modular production can be achieved, installation and maintenance are convenient, different installation environments and space requirements can be met, and the application range is wide. And meanwhile, the problems of complex connection and installation possibly caused by an external heat dissipation device are also avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of heat dissipation of photovoltaic components, in particular to a photovoltaic component. Background Art

[0002] Photovoltaic modules are the core part of solar power generation systems. Photovoltaic modules convert light energy into electrical energy through the photoelectric conversion effect. Photovoltaic modules generate a lot of heat during operation, which is difficult to dissipate quickly, causing the temperature of photovoltaic modules to continue to rise. As the temperature rises, the power generation efficiency of photovoltaic cells will drop significantly, and high temperature will accelerate the aging of materials inside photovoltaic modules. The packaging materials may become brittle and crack, and the performance of the cells will gradually decline. Photovoltaic modules are in high temperature environments for a long time, which greatly shortens their service life. Photovoltaic modules that could have been used for 25 years or even longer may experience performance degradation and failure in a short period of time due to excessive temperature, increasing the replacement cost of the system.

[0003] At present, there are generally two solutions for cooling photovoltaic modules: 1. Use fans and other equipment to force air flow to remove the heat from the surface of the photovoltaic modules. However, the operation of the fan consumes electricity, which increases the energy consumption of the system. 2. By laying cooling water pipes on the back of the photovoltaic modules, the high specific heat capacity of water is used to absorb heat. However, it is necessary to install water pumps, pipes and other equipment, which increases the initial investment cost and installation difficulty. There is a risk of water leakage. Once a water leakage occurs, it may damage the photovoltaic modules and affect the safety of the system. At the same time, the water cooling system requires regular maintenance, such as cleaning the pipes and changing the water, which increases the maintenance cost.

[0004] In summary, the existing photovoltaic module cooling solutions have complex processes and are not conducive to large-scale promotion and use. Utility Model Content

[0005] In view of this, the utility model provides a photovoltaic module to solve the problem of complex cooling process of existing photovoltaic modules.

[0006] The utility model provides a photovoltaic component, comprising: a packaging front plate, a battery layer and a heat dissipation back plate which are stacked in sequence, the heat dissipation back plate having a hollow heat dissipation cavity, an inlet and an outlet are respectively arranged on both sides of the heat dissipation cavity, a plurality of heat dissipation channels are arranged in the heat dissipation cavity, the two ends of the heat dissipation channel are respectively connected to the inlet and the outlet, a low-temperature medium enters the heat dissipation channel through the inlet for heat exchange and is then output from the outlet.

[0007] Optionally, a plurality of partitions are provided in the heat dissipation cavity, and the heat dissipation channel is formed by spacing between two adjacent partitions.

[0008] Optionally, a connecting plate is provided in the heat dissipation channel. The connecting plate is arranged parallel to the partition plate, one end of the connecting plate abuts against the inner wall of the heat dissipation channel, and the other end is spaced from the opposite inner wall of the heat dissipation channel.

[0009] Optionally, adjacent two of the connecting plates are arranged to abut against the inner walls at different horizontal positions of the corresponding heat dissipation channels, so as to form an alternating arrangement.

[0010] Optionally, the partition plate is a curved arc plate, and adjacent two curved arc plates are symmetrically arranged.

[0011] Optionally, both ends of the curved arc plate have two arc segments with opposite orientations and a main body segment connecting the two arc segments. The two arc segments respectively abut against the inner walls of the heat dissipation channel, and the radian of the arc segment is greater than that of the main body segment.

[0012] Optionally, collecting channels are respectively arranged at both ends of the heat dissipation channel, and the inlet and the outlet are respectively communicated with a plurality of the heat dissipation channels through one of the collecting channels.

[0013] Optionally, further comprising:

[0014] An encapsulation rear plate, which is arranged between the battery cell layer and the heat dissipation back plate.

[0015] Optionally, further comprising:

[0016] A glue film layer, which is arranged between the heat dissipation back plate and the encapsulation rear plate, between the encapsulation rear plate and the battery cell layer, and between the encapsulation front plate and the battery cell layer.

[0017] Optionally, the heat dissipation back plate is any one of a steel plate, an aluminum plate, a copper plate, a steel-plastic composite plate or a glass fiber composite plate.

[0018] Advantageous Effects

[0019] The utility model provides a photovoltaic module, comprising: an encapsulation front plate, a battery cell layer and a heat dissipation back plate which are sequentially stacked. The heat dissipation back plate has a hollow heat dissipation cavity. An inlet and an outlet are respectively arranged on both sides of the heat dissipation cavity. A plurality of heat dissipation channels are arranged in the heat dissipation cavity. Both ends of the heat dissipation channel are respectively communicated with the inlet and the outlet. A low-temperature medium enters the heat dissipation channel through the inlet for heat exchange and then is output from the outlet.

[0020] The photovoltaic module of this structure provides an efficient heat dissipation path for the photovoltaic module through the hollow heat dissipation cavity and multiple internal heat dissipation channels. When the photovoltaic module generates heat during operation, the low-temperature medium can quickly flow into the heat dissipation channels, exchange heat with the heat-generating parts, and quickly take away the heat, forming a continuous heat dissipation cycle, ensuring that the photovoltaic module always remains within a relatively low temperature range. This effectively reduces the operating temperature of the photovoltaic module, helps to extend the service life of the photovoltaic module, and improves the power generation efficiency and stability of the photovoltaic module. Compared with the traditional heat dissipation methods such as using fans or adding cooling water pipes and other components, the heat dissipation cavity and heat dissipation channels of the photovoltaic module of this structure are integrated inside the heat dissipation backplane, without additionally increasing the external size of the photovoltaic module. It has a compact structure, occupies a small space, can be produced modularly, is convenient for installation and maintenance, can also adapt to different installation environments and space requirements, and at the same time avoids the complex connection and installation problems that may be brought by external heat dissipation devices. Moreover, by setting multiple heat dissipation channels, the contact area between the low-temperature medium and the heat-generating parts is increased, ensuring the heat dissipation effect. Description of the Drawings

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of a heat dissipation backplane according to an embodiment of the present invention;

[0023] Figure 2 It is a bottom view of a heat dissipation backplane according to an embodiment of the present invention;

[0024] Figure 3 It is a schematic cross-sectional view of a photovoltaic module according to an embodiment of the present invention;

[0025] Figure 4 It is another schematic cross-sectional view of a photovoltaic module according to an embodiment of the present invention;

[0026] Figure 5 It is yet another schematic cross-sectional view of a photovoltaic module according to an embodiment of the present invention;

[0027] Description of the Reference Numerals:

[0028] 1. Heat dissipation backplane; 11. Inlet; 12. Outlet; 13. Heat dissipation channel; 14. Collection channel; 21. Encapsulation front plate; 22. Battery cell layer; 23. Encapsulation back plate; 24. Adhesive film layer; 25. Wiring board. Detailed Embodiments

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0030] The following Figures 1 to 2 describes the embodiments of the present utility model.

[0031] According to an embodiment of the present utility model, a photovoltaic module is provided, comprising: a front encapsulation plate 21, a battery cell layer 22, and a heat dissipation back plate 1 that are sequentially stacked. The heat dissipation back plate 1 has a hollow heat dissipation cavity. An inlet 11 and an outlet 12 are respectively arranged on both sides of the heat dissipation cavity. A plurality of heat dissipation channels 13 are arranged in the heat dissipation cavity. Both ends of the heat dissipation channels 13 are respectively communicated with the inlet 11 and the outlet 12. A low-temperature medium enters the heat dissipation channels 13 through the inlet 11 for heat exchange and then is output from the outlet 12.

[0032] It is easily understandable that the front encapsulation plate 21 includes, but is not limited to, glass materials and polymer materials. The thickness range of the glass material is from 0.7 mm to 10 mm, and the preferred thickness values can be 0.7 mm, 0.8 mm, 1.1 mm, 1.6 mm, 2 mm, 3.2 mm, 5 mm, 6 mm, etc.; the polymer material structure includes, but is not limited to, a multi-layer composite structure of fluorine film and polyester, a glass fiber reinforced structure, etc. No specific limitation is imposed on the specific materials of the front encapsulation plate 21 here.

[0033] It is easily understandable that the size of the heat dissipation back plate 1 needs to be determined according to the specific specifications and heat dissipation requirements of the photovoltaic module. If the area of the photovoltaic module is large, in order to ensure uniform heat dissipation of the entire module, the area of the heat dissipation back plate 1 should also be relatively large accordingly. This can enable the heat dissipation channels 13 to cover a wider area and better absorb the heat generated by the battery cell layer 22. For small household photovoltaic modules, the area of the heat dissipation back plate 1 can be relatively small, but the heat generation situation and heat dissipation requirements of the battery cell layer 22 also need to be fully considered. Here, no specific limitation is imposed on the specific size of the heat dissipation back plate 1, but the area of the heat dissipation back plate 1 should at least be able to cover most of the area of the battery cell layer 22 to ensure sufficient heat dissipation capacity.

[0034] Understandably, the inlet 11 and the outlet 12 are the passage openings for the low-temperature medium to enter and exit the heat dissipation cavity of the heat dissipation backplane 1. They are located on one side of the heat dissipation backplane 1 and are connected to the heat dissipation cavity. Their design usually takes into account the smooth inflow of the medium, and may adopt appropriate shapes and sizes to ensure that the low-temperature medium can enter the heat dissipation cavity quickly and evenly. In this embodiment, the inlet 11 and the outlet 12 are set to be circular. In other embodiments, according to the different types of pipes specifically connected, corresponding adapters can be installed on the inlet 11 or the outlet 12, or they can be directly set as the corresponding interfaces.

[0035] It should be noted that the low-temperature medium can be water, air or coolant. In this embodiment, air is selected as the low-temperature medium. Air is widely available and does not require additional costs. It can flow through natural convection or forced ventilation to achieve heat dissipation. However, the air may contain dust and impurities, and filtering measures need to be taken, such as adding a filter screen, to prevent blockage of the heat dissipation channel 13. In other embodiments, water or a specially designed coolant can also be selected. Water has a large specific heat capacity and can absorb more heat, thus achieving a good heat dissipation effect. Moreover, it has good fluidity and can flow quickly in the heat dissipation channel 13 to improve the heat exchange efficiency. However, attention needs to be paid to preventing scaling and corrosion problems. The specially designed coolant usually has a high boiling point and a low freezing point, and can be applicable to various different working environments. It has good thermal stability and chemical stability, and is not easy to decompose and deteriorate. However, the cost is relatively high, and it needs to be replaced and maintained regularly. Moreover, some coolants may have a certain impact on the environment, and environmental protection issues need to be paid attention to during the use and treatment process.

[0036] The photovoltaic module provided by the embodiment of the present utility model provides an efficient heat dissipation path for the photovoltaic module through the hollow heat dissipation cavity and the multiple heat dissipation channels 13 inside. When the photovoltaic module generates heat during operation, the low-temperature medium can quickly flow into the heat dissipation channel 13, exchange heat with the heat-generating part, and quickly take away the heat, forming a continuous heat dissipation cycle, ensuring that the photovoltaic module always maintains a relatively low temperature range, thereby effectively reducing the working temperature of the photovoltaic module, helping to extend the service life of the photovoltaic module, and improving the power generation efficiency and stability of the photovoltaic module. Compared with the traditional heat dissipation methods such as fans or adding cooling water pipes and other components, the heat dissipation cavity and the heat dissipation channels 13 of the photovoltaic module with this structure are integrated inside the heat dissipation backplane 1, without additionally increasing the external size of the photovoltaic module. The structure is compact, occupies little space, and can be produced modularly. It is convenient for installation and maintenance, and can also adapt to different installation environments and space requirements. At the same time, it also avoids the complex connection and installation problems that may be brought by external heat dissipation devices. Moreover, by setting multiple heat dissipation channels 13, the contact area between the low-temperature medium and the heat-generating part is increased, ensuring the heat dissipation effect.

[0037] Furthermore, it further includes:

[0038] The encapsulation rear plate 23 is disposed between the battery cell layer 22 and the heat dissipation back plate 1.

[0039] Understandably, the encapsulation rear plate 23 can be a glass back plate with different thicknesses, or a polymer back plate constructed with a fluorine film + polyester, or a polymer back plate reinforced with glass fiber. The specific material of the encapsulation back plate is not limited herein.

[0040] Understandably, the heat dissipation back plate 1 can also directly replace the encapsulation back plate, that is, without setting the encapsulation back plate, and the heat dissipation back plate 1 is directly disposed on the lower side of the battery cell layer 22. In this case, the heat dissipation back plate 1 not only undertakes the heat dissipation function, but also replaces the protection and support functions of the original encapsulation back plate. In an alternative embodiment, the heat dissipation back plate 1 can be disposed behind the encapsulation back plate, and the original encapsulation back plate continues to play its role of protecting the battery cell layer 22 and providing structural support, while the newly added heat dissipation back plate 1 focuses on efficient heat dissipation.

[0041] Furthermore, it further includes:

[0042] The adhesive film layer 24 is disposed between the heat dissipation back plate 1 and the encapsulation rear plate 23, between the encapsulation rear plate 23 and the battery cell layer 22, and between the encapsulation front plate 21 and the battery cell layer 22.

[0043] Understandably, the adhesive film layer 24 can be EVA, POE with different grammages, PVB with different thicknesses of EPE, etc. The specific material of the adhesive film layer 24 is not limited herein.

[0044] It should be noted that for the connection between the heat dissipation back plate 1 and the battery cell layer 22, the adhesive film layer 24 can be selected, or it can also be silicone structural adhesive, thermal conductive adhesive, polyurethane adhesive, weather-resistant sealant, polymer adhesive film, etc. Herein, the connection method and structure between the heat dissipation back plate 1 and the battery cell layer 22 are not limited, as long as it can play a role in stable fixation.

[0045] Furthermore, a wiring board 25 is further disposed at the rear side of the battery cell layer 22. The wiring board 25 is used to conduct the electric energy generated by the photovoltaic module through photovoltaic power generation to storage or other electrical equipment. The wiring board 25 is usually disposed near one side edge of the photovoltaic module, and multiple wiring boards can be set according to requirements.

[0046] Refer to Figure 3 As shown, furthermore, a plurality of partition plates are disposed in the heat dissipation cavity, and heat dissipation channels 13 are formed at intervals between adjacent two partition plates.

[0047] It is easy to understand that the partition divides the heat dissipation cavity into a plurality of independent heat dissipation channels 13, providing a clear flow path for the low-temperature medium. The low-temperature medium can flow in the heat dissipation channel 13 in an orderly manner, avoiding a chaotic flow state, thereby improving the efficiency of heat exchange. At the same time, the partition also increases the structural strength of the heat dissipation back plate 1, making it more stable when subjected to external pressure and internal medium flow pressure; and increases the contact area between the low-temperature medium and the heat dissipation back plate 1. When the low-temperature medium flows in the heat dissipation channel 13, it is in full contact with the surface of the partition and the heat dissipation back plate 1, thereby improving the speed and efficiency of heat exchange. More contact area means that more heat can be quickly transferred to the low-temperature medium, thereby effectively reducing the temperature of the photovoltaic module.

[0048] If the partition is not provided, the low-temperature medium in the heat dissipation cavity may flow unevenly, and may even form a vortex or dead water area, resulting in the accumulation of impurities and sediments, thereby blocking the heat dissipation channel 13. The provision of the partition can effectively prevent this from happening, ensuring that the low-temperature medium can always flow in the unobstructed heat dissipation channel 13, thereby improving the reliability and stability of the photovoltaic module.

[0049] It should be noted that in the present example, the partition is detachably arranged in the heat dissipation cavity, for example, by means of a card slot connection. If a heat dissipation problem occurs during use, the partition can be detachably arranged to facilitate troubleshooting and maintenance. For example, the location of the problem can be quickly determined by checking the medium flow and temperature distribution in different heat dissipation channels 13. At the same time, the partition can also be easily cleaned and replaced to ensure the long-term and effective operation of the heat dissipation system. Of course, in some installation areas with good air quality or maintenance-free installation, the partition can also be directly fixed in the heat dissipation cavity, or directly integrally formed inside the heat dissipation backplane 1 during production.

[0050] Reference Figure 4 As shown, further, a connecting plate is provided in the heat dissipation channel 13, the connecting plate is arranged parallel to the partition plate, and one end of the connecting plate abuts against the inner wall of the heat dissipation channel 13, and the other end is spaced from another inner wall opposite to the heat dissipation channel 13.

[0051] It is easy to understand that one end of the connecting plate is in contact with the inner wall of the heat dissipation channel 13, and the other end is spaced apart from the other inner wall opposite to the connecting plate, thereby forming a specific flow path in the heat dissipation channel 13. When the low-temperature medium flows through the space between the connecting plate and the inner wall, the flow velocity will change, resulting in a local turbulence effect. This turbulence effect can enhance the heat exchange between the medium and the inner wall of the heat dissipation channel 13 and the battery layer 22, further improving the heat dissipation effect.

[0052] Furthermore, two adjacent connecting plates are disposed in contact with inner walls of the corresponding heat dissipation channels 13 at different horizontal positions to form a staggered arrangement.

[0053] Understandably, such an interleaved arrangement makes the flow path of the low-temperature medium in the heat dissipation channel 13 more complex. When the medium flows through the intervals between different connecting plates and the inner wall, it continuously changes its direction and flow rate, thereby generating more turbulence and disturbances. Such disturbances increase the contact and heat exchange between the medium and the inner wall of the heat dissipation channel 13 as well as the battery sheet layer 22, significantly improving the heat exchange efficiency.

[0054] Referring to Figure 5 As shown, further, the partition is a curved arc plate, and two adjacent curved arc plates are symmetrically arranged.

[0055] Understandably, the partition in the shape of a curved arc plate can play a unique guiding role in the flow of the low-temperature medium in the heat dissipation channel 13. Its arc design can make the medium flow more smoothly, reducing the flow resistance. Compared with traditional straight partition plates, the curved arc plate can better adapt to the principles of fluid mechanics and reduce the energy loss of the medium during the flow process. Multiple curved arc plates can be integrally processed and then installed in the heat dissipation cavity of the heat dissipation back plate 1, or can be separately processed and then spliced and fixed to each other through an adhesive.

[0056] Furthermore, both ends of the curved arc plate have two arc segments with different orientations and a main body segment connecting the two arc segments. The two arc segments are respectively in contact with the inner wall of the heat dissipation channel 13, and the radian of the arc segment is greater than that of the main body segment.

[0057] Understandably, both ends of the curved arc plate have two arc segments with different orientations and a main body segment connecting them. This design makes the curved arc plate form a complex and orderly structure in the heat dissipation channel 13. The arc segments are in contact with the inner wall of the heat dissipation channel 13, which can better guide the flow of the low-temperature medium and reduce the flow resistance. At the same time, the main body segment connects the two arc segments, providing structural support for the entire curved arc plate and ensuring its stability in the heat dissipation channel 13. And the transition part between the arc segments and the main body segment with different radian is relatively smooth, which can reduce the phenomenon of stress concentration. This helps to avoid the curved arc plate from cracking or being damaged due to stress concentration during long-term use, improving the reliability and service life of the photovoltaic module. The radian of two adjacent arc segments can be the same, forming a complete arc after splicing. Of course, they can also form separate arcs after splicing, and no specific restrictions are made here. In addition, the partition can also be symmetrically arranged obliquely to form a broken line shape, thereby forming a heat dissipation channel 13 with a triangular longitudinal section. No specific restrictions are made on the specific shape of the partition here.

[0058] Further, collecting channels 14 are respectively arranged at both ends of the heat dissipation channel 13, and the inlet 11 and the outlet 12 are respectively communicated with a plurality of heat dissipation channels 13 through a collecting channel 14.

[0059] Understandably, the converging channel 14 serves to evenly distribute the low-temperature medium to each heat dissipation channel 13. When the low-temperature medium enters the converging channel 14 from the inlet 11, it can be initially diffused and balanced within the converging channel 14, and then flow into each heat dissipation channel 13 respectively. This can ensure that each heat dissipation channel 13 can obtain sufficient low-temperature medium, avoiding the situation where the flow rate of some channels is too large or too small, thus achieving a more uniform heat dissipation effect. In this embodiment, the two heat dissipation channels 13 are symmetrically arranged along the width direction of the heat dissipation backplane 1.

[0060] Furthermore, the heat dissipation backplane 1 is any one of a steel plate, an aluminum plate, a copper plate, a steel-plastic composite plate, or a glass fiber composite plate.

[0061] Here, an integrated molding process for this device is provided: laminating the encapsulation front plate 21, the adhesive film layer 24, the battery cell layer 22, the adhesive film layer 24, and the heat dissipation backplane 1 that are sequentially stacked in layers. The optional structural layers are a glass front plate, a PVB adhesive film, a battery cell, a PVB adhesive film, a glass backplane, a PVB bonding layer, and a corrugated through-hole cooling steel plate. The lamination temperature is 140°C - 170°C, the lamination time is 1h - 3h, and the lamination pressure is: -0.5 to -1.5 MPa.

[0062] Here, another integrated molding process for this device is provided: laminating the encapsulation front plate 21, the adhesive film layer 24, the battery cell layer 22, the adhesive film layer 24, and the heat dissipation backplane 1 that are sequentially stacked in layers; the optional structural layers are a glass fiber-reinforced polymer front plate, an EPE adhesive film, the battery cell layer 22, an EPE adhesive film, and a cooling backplane. The lamination temperature is 130°C - 150°C, the lamination time is 15 min - 30 min, and the lamination pressure is: -30 to -40 kPa.

[0063] Here, a secondary lamination molding process for this device is provided: first laminating the encapsulation front plate 21, the adhesive film layer 24, the battery cell layer 22, and the encapsulation backplane in sequence to form a power generation unit, and then secondarily laminating the power generation unit with an adhesive layer mold and a cooling backplane to form a photovoltaic-thermal product; the structural layers can be a polymer front plate, a POE adhesive film, a battery cell, a POE adhesive film, a polymer backplane, a thermally conductive adhesive bonding layer, and an encapsulation backplane. When laminating the power generation unit for the first time, a hard plate is required as the support tooling material to avoid the battery cells from being cracked during the preparation process; during the secondary lamination, the adhesive film layer 24 of the thermally conductive adhesive can be fully coated or coated in a grid pattern. The lamination temperature is 130°C - 160°C, the lamination time is 15 min - 30 min, and the lamination pressure is: -30 to -40 kPa.

[0064] Here, a device is provided, and its manufacturing process can be as follows: First, encapsulate the front plate 21, the adhesive film layer 24, the battery cell layer 22, the adhesive film layer 24, and the encapsulation backplane layer to prepare a power generation unit, and then bond the power generation unit with the cooling backplane by cold pressing and standing still using silicone structural adhesive or polyurethane adhesive. Its structural layers can be a glass front plate, a POE adhesive film, a battery cell, a POE adhesive film, a polymer backplane, a silicone adhesive bonding layer, and an encapsulation backplane layer; when using silicone adhesive for bonding, it can be fully coated, strip-coated, dot-bonded, or cross-grid coated; the amount of bonding adhesive used for different coating methods is 100 ml - 3000 ml, the cold pressing pressure is 0.1 - 5 Mpa, and the cold pressing standing still time is 5 - 24 h.

[0065] Obviously, the above embodiments are only examples given for clear illustration, rather than limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present utility model.

Claims

1. A photovoltaic module, characterized in that, Including: A front encapsulation plate (21), a battery cell layer (22), and a heat dissipation back plate (1) which are sequentially stacked in order. The heat dissipation back plate (1) has a hollow heat dissipation cavity. An inlet (11) and an outlet (12) are respectively arranged on both sides of the heat dissipation cavity. A plurality of heat dissipation channels (13) are arranged in the heat dissipation cavity. Both ends of the heat dissipation channel (13) are respectively communicated with the inlet (11) and the outlet (12). A low-temperature medium enters the heat dissipation channel through the inlet (11) for heat exchange and then is output from the outlet (12).

2. The photovoltaic module according to claim 1, wherein, A plurality of partition plates are arranged in the heat dissipation cavity, and the heat dissipation channels (13) are formed by intervals between adjacent two partition plates.

3. The photovoltaic module according to claim 2, wherein, A connecting plate is arranged in the heat dissipation channel (13). The connecting plate is arranged parallel to the partition plate, and one end of the connecting plate abuts against the inner wall of the heat dissipation channel, and the other end is spaced from the opposite inner wall of the heat dissipation channel.

4. The photovoltaic module according to claim 3, wherein, Adjacent two connecting plates are arranged to abut against the inner walls at different horizontal positions of the corresponding heat dissipation channel, so as to form an alternating arrangement.

5. The photovoltaic module according to claim 2, characterized in that, The partition plate is a curved arc plate, and adjacent two curved arc plates are symmetrically arranged.

6. The photovoltaic module according to claim 5, characterized in that, Both ends of the curved arc plate have two arc segments with opposite orientations and a main body segment connecting the two arc segments. The two arc segments respectively abut against the inner wall of the heat dissipation channel, and the radian of the arc segment is greater than that of the main body segment.

7. The photovoltaic module according to any one of claims 1-6, characterized in that, Both ends of the heat dissipation channel (13) are respectively provided with a collecting channel (14). The inlet (11) and the outlet (12) are respectively communicated with a plurality of heat dissipation channels (13) through one collecting channel (14).

8. The photovoltaic module according to any one of claims 1-6, characterized in that, Also including: A rear encapsulation plate (23) which is arranged between the battery cell layer (22) and the heat dissipation back plate (1).

9. The photovoltaic module according to claim 8, wherein Also including: A glue film layer (24) which is arranged between the heat dissipation back plate (1) and the rear encapsulation plate (23), between the rear encapsulation plate (23) and the battery cell layer (22), and between the front encapsulation plate (21) and the battery cell layer (22).

10. The photovoltaic module according to any one of claims 1-6, characterized in that, The heat dissipation back plate (1) is any one of a steel plate, an aluminum plate, a copper plate, a steel-plastic composite plate or a glass fiber composite plate.

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