A crystalline silicon tandem cell photovoltaic module

Abstract

The application discloses a kind of crystalline silicon laminated cell photovoltaic module, belong to solar cell technical field, including bottom plate, the crystalline silicon cell is installed on the bottom plate by lower layer encapsulation adhesive film, the edge at the bottom of the bottom plate is equipped with junction box, the glass cover plate is installed on the crystalline silicon cell by upper layer encapsulation adhesive film, perovskite cell is equipped on the glass cover plate, and four-terminal laminated component is formed after being laminated and being combined, the outer surface of the bottom plate and glass cover plate is equipped with aluminum frame in common;Through the perovskite cell, heat conduction component and controllable air inlet component set, four-terminal laminated structure and "silicon first perovskite" laminating process are realized, perovskite directly contacts high-temperature silicon bottom component is avoided, so that perovskite layer service life is extended, efficiency decay is controlled, and liquid cooling-air cooling dual-mode cooling system adapts to seasonal temperature difference, summer is quickly heat-conducted through circulating coolant, winter heating promotes snow melting, and stable power generation in each temperature range is ensured.

Description

Technical Field

[0001] This invention relates to the field of solar cell technology, and more particularly to a crystalline silicon tandem solar cell photovoltaic module. Background Technology

[0002] With the continuous breakthroughs in photovoltaic power generation technology, crystalline silicon-perovskite tandem solar cells have become the core of research for the next generation of high-efficiency photovoltaic technology, thanks to their potential theoretical efficiency of over 30%.

[0003] However, existing tandem solar cell technology faces three major challenges in commercial applications: Traditional tandem modules mostly adopt a direct lamination process of "perovskite-crystalline silicon". The high-temperature lamination process is prone to ion migration, phase separation and interface degradation of perovskite materials. In addition, the independent circuit design requirements of crystalline silicon cells and perovskite cells in four-terminal tandem structures place higher demands on the packaging process. At the same time, in photovoltaic module arrays installed side by side, traditional heat dissipation structures are prone to forming heat island effects, reducing the overall power generation efficiency. Meanwhile, changes in wind direction in different seasons pose challenges to the dynamic adaptability of the heat dissipation system, and existing fixed air-guiding structures are difficult to achieve efficient natural heat dissipation. Summary of the Invention

[0004] The purpose of this invention is to address the problem that traditional tandem modules often use a direct lamination process of "perovskite-crystalline silicon" and to propose a crystalline silicon tandem photovoltaic module.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A crystalline silicon tandem photovoltaic module includes a base plate, on which crystalline silicon cells are mounted through a lower encapsulating film. A junction box is fitted at the bottom edge of the base plate. A glass cover is mounted on the crystalline silicon cells through an upper encapsulating film. A perovskite cell is provided on the glass cover and the modules are laminated together to form a four-terminal tandem module. An aluminum frame is fitted on the outer surfaces of the base plate and the glass cover.

[0007] A heat-conducting component is installed at the bottom of the base plate. The heat-conducting component includes a contact plate mounted on the bottom of the base plate. Heat from the bottom of the base plate is transferred downwards through a conduction component mounted on the contact plate. A controllable air intake component is rotatably connected to the bottom of the contact plate.

[0008] As a further description of the above technical solution:

[0009] The conductive component includes an upper heat pipe. The upper surface of the contact plate is provided with a mounting groove that is compatible with the upper heat pipe, so that the upper heat pipe can be installed on the contact plate. The upper surface of the upper heat pipe is in contact with the bottom of the base plate. The two ends of the upper heat pipe that penetrate into the controllable air intake component are jointly installed with a lower heat pipe. Multiple heat dissipation fins are mounted on the upper part of the lower heat pipe.

[0010] As a further description of the above technical solution:

[0011] The contact plate has a circulation channel corresponding to the mounting slot, and the mounting slot is connected to the circulation channel. A liquid storage tank is provided below the aluminum frame, and a circulating water pump is provided on the liquid storage tank. The output end of the circulating water pump is connected to the inlet of the circulation channel through a liquid delivery pipe. A liquid extraction pipe with one end inside the liquid storage tank is installed at the input end of the circulating water pump, and the outlet of the circulation channel is connected to the liquid storage tank through a discharge pipe.

[0012] As a further description of the above technical solution:

[0013] The controllable air intake assembly includes a base fixed to the bottom of the contact plate. An air guide frame is rotatably connected to the lower surface of the base. A guide frame is rotatably connected inside the air guide frame. The upper surface of the guide frame is in contact with the bottom of the contact plate. Through holes are provided on both sides of the air guide frame and the guide frame.

[0014] As a further description of the above technical solution:

[0015] Two blocking blocks are fixed on the outer wall of the guide frame and fit against the inner wall of the air guide frame, so that the space between the inner wall of the air guide frame and the outer wall of the guide frame is divided into two parts.

[0016] As a further description of the above technical solution:

[0017] A shaft tube is fixed at the center of the bottom of the air guide frame, and a shaft rod is inserted into the shaft tube. One end of the shaft rod passes through the air guide frame and is fixed to the guide frame.

[0018] As a further description of the above technical solution:

[0019] The outer surfaces of the shaft tube and shaft rod are each equipped with two driven sprockets. The outer surface of the base is equipped with a mounting bracket, and the bottom of the mounting bracket is equipped with two motors. The inner wall of the mounting bracket is equipped with two driving sprockets through two bearing seats. The output end of the motor is connected to the bottom end of the driving sprocket.

[0020] As a further description of the above technical solution:

[0021] One of the driving sprockets is connected to one of the driven sprockets located on the shaft via a first chain, and the other driving sprocket is connected to one of the driven sprockets located on the shaft via a second chain.

[0022] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0023] By incorporating perovskite cells, heat-conducting components, and controllable air intake components, a four-terminal stacked structure and a "silicon-first, perovskite-later" lamination process are achieved. This avoids direct contact between the perovskite and the high-temperature silicon substrate, extending the lifespan of the perovskite layer and controlling efficiency degradation. Meanwhile, the liquid-cooling and air-cooling dual-mode heat dissipation system adapts to the temperature differences of all four seasons. In summer, it rapidly conducts heat through circulating coolant, while in winter, it heats up to promote snow melting, ensuring stable power generation in all temperature ranges.

[0024] The controllable air intake component dynamically adjusts the air intake direction of the air guide frame and the guide frame through a motor-driven sprocket mechanism, adapting to east / west / south / north winds and oblique winds; when multiple components are installed side by side, adjacent heat conduction components are staggered and combined with the shaft tube-shaft series system to achieve synchronous heat dissipation control, ensuring smooth flow of natural air between components and avoiding the heat island effect. Attached Figure Description

[0025] Figure 1 A schematic diagram of the installation location of a perovskite solar cell according to an embodiment of the present invention is shown;

[0026] Figure 2 A schematic diagram of the overall first perspective provided according to an embodiment of the present invention is shown;

[0027] Figure 3 A schematic diagram of the internal structure of the air guide frame provided according to an embodiment of the present invention is shown;

[0028] Figure 4 A schematic diagram of the internal structure of the contact plate provided according to an embodiment of the present invention is shown;

[0029] Figure 5 This shows a schematic diagram of the cross-section of the air guide frame provided according to an embodiment of the present invention;

[0030] Figure 6 A schematic diagram of the structure of the contact plate surface provided according to an embodiment of the present invention is shown;

[0031] Figure 7 A schematic diagram of the contact plate after being cut open according to an embodiment of the present invention is shown;

[0032] Figure 8 A schematic diagram of an overall second perspective provided according to an embodiment of the present invention is shown;

[0033] Figure 9 A schematic diagram of the photovoltaic module as a whole from a first perspective, provided according to an embodiment of the present invention, is shown;

[0034] Figure 10 A schematic diagram of the photovoltaic module as a whole from a second perspective, provided according to an embodiment of the present invention, is shown;

[0035] Figure 11A schematic diagram from a first perspective is shown when photovoltaic modules are installed side by side according to an embodiment of the present invention;

[0036] Figure 12 A schematic diagram of the structure of photovoltaic modules installed side by side according to an embodiment of the present invention is shown from a second perspective.

[0037] Figure 13 A schematic diagram of the misaligned air guide frame provided according to an embodiment of the present invention is shown.

[0038] Legend:

[0039] 10. Base plate; 11. Crystalline silicon solar cell; 12. Glass cover plate; 13. Perovskite solar cell;

[0040] 20. Aluminum frame;

[0041] 30. Heat-conducting component; 31. Contact plate; 32. Circulation channel; 33. Liquid storage tank; 34. Circulating water pump; 35. Infusion pipe; 36. Discharge pipe; 37. Conductive component; 371. Upper heat-conducting pipe; 372. Lower heat-conducting pipe; 373. Heat dissipation fins;

[0042] 40. Controllable air intake assembly; 41. Air guide frame; 42. Guide frame; 43. Through hole; 44. Blocking block; 45. Shaft tube; 46. Shaft rod; 47. Driven sprocket; 48. Mounting bracket; 49. Motor. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0044] like Figure 1 - Figure 13 As shown, the present invention provides:

[0045] A crystalline silicon tandem photovoltaic module includes a base plate 10, on which crystalline silicon cells 11 are mounted via a lower encapsulating film. A junction box is fitted at the bottom edge of the base plate 10. Notably, multiple crystalline silicon cells 11 are connected in series. A glass cover plate 12 is mounted on the crystalline silicon cells 11 via an upper encapsulating film. Perovskite cells 13 are mounted on the glass cover plate 12, and the modules are laminated together to form a four-terminal tandem module. Notably, interconnecting strips are provided on the surfaces of both the perovskite cells 13 and the crystalline silicon cells 11, which is a known technology. The details will not be elaborated here. In particular, the crystalline silicon cell 11 and the perovskite cell 13 are two independent cells. At the same time, the perovskite cell 13 and the crystalline silicon cell string 11 are connected through an external circuit. The outer surfaces of the base plate 10 and the glass cover plate 12 are jointly equipped with an aluminum frame 20. In particular, by first installing the silicon base module (crystalline silicon cell 11), then installing the glass cover plate 12, and then making a semi-transparent perovskite top module (crystalline silicon cell 11) on the glass cover plate 12, and finally laminating, a four-terminal stacked module is formed, which avoids the risk of perovskite degradation and improves the efficiency of photovoltaic modules.

[0046] like Figure 3 , Figure 4 , Figure 6 and Figure 7 As shown, a heat-conducting component 30 is installed at the bottom of the base plate 10. The heat-conducting component 30 includes a contact plate 31 mounted on the bottom of the base plate 10. The heat at the bottom of the base plate 10 is transferred downward through a conduction component 37 mounted on the contact plate 31.

[0047] The contact plate 31 has a circulation channel 32 corresponding to the mounting groove, and the mounting groove is connected to the circulation channel 32. It should be noted that after the upper heat conduction pipe 371 is fixed in the mounting groove, it is sealed to the inner wall of the mounting groove, and its bottom is in the circulation channel 32. When coolant is sent into the circulation channel 32, it can quickly remove the heat conducted by the upper heat conduction pipe 371. The aluminum frame 20 is provided with a liquid storage tank 33, and a circulating water pump 34 is provided on the liquid storage tank 33. The output end of the circulating water pump 34 is connected to the liquid inlet of the circulation channel 32 through the liquid delivery pipe 35. The input end of the circulating water pump 34 is equipped with a liquid extraction pipe that is in the liquid storage tank 33, and the liquid outlet of the circulation channel 32 is connected to the liquid storage tank 33 through the discharge pipe 36.

[0048] The conductive component 37 includes an upper heat pipe 371. The upper surface of the contact plate 31 is provided with a mounting groove that is compatible with the upper heat pipe 371, so that the upper heat pipe 371 can be installed on the contact plate 31. The upper surface of the upper heat pipe 371 is in contact with the bottom of the base plate 10. The two ends of the upper heat pipe 371 that penetrate into the controllable air intake component 40 are jointly installed with a lower heat pipe 372. Preferably, both the upper heat pipe 371 and the lower heat pipe 372 are copper pipes. The lower heat pipe 372 is equipped with a plurality of heat dissipation fins 373. Specifically, the upper heat pipe 371 can conduct heat from the surface of the base plate 10 to the lower heat pipe 372, and then dissipate it through the heat dissipation fins 373.

[0049] Preferably, the liquid storage tank 33 is equipped with a refrigeration element and a heating element for cooling and heating, which are known technologies and will not be described in detail here. The refrigeration element can reduce the temperature of the coolant (water) in the liquid storage tank 33. Specifically, when used in summer, the refrigeration element reduces the temperature of the coolant. In this state, the low-temperature coolant is sent into the circulation channel 32 by the circulating water pump 34 and circulates in the channel, thereby removing the heat from the base plate 10. It is worth noting that when multiple photovoltaic modules are arranged side by side, the inlet and outlet of each circulation channel 32 need to be connected sequentially, and the outlet of the last circulation channel 32 is connected to the liquid storage tank 33 through the discharge pipe 36. At this time, the circulating water pump 34 can send the coolant into multiple circulation channels 32 for circulation, thereby removing the heat conducted by the upper heat conduction pipe 371.

[0050] like Figure 2 , Figure 3 , Figure 5 and Figure 13 As shown, a controllable air intake assembly 40 is rotatably connected to the bottom of the contact plate 31;

[0051] The controllable air intake assembly 40 includes a base fixed to the bottom of the contact plate 31. A guide frame 41 is rotatably connected to the lower surface of the base. A guide frame 42 is rotatably connected inside the guide frame 41, and the upper surface of the guide frame 42 is in contact with the bottom of the contact plate 31. Through holes 43 are provided on both sides of the guide frame 41 and the guide frame 42. Preferably, a filter is attached to the outer wall of the guide frame 41 at the position corresponding to the through hole 43 by a slot. The filter can block particulate matter carried in the air and prevent it from entering the frame.

[0052] Two blocking blocks 44 are fixed on the outer wall of the guide frame 42 and fit against the inner wall of the air guide frame 41, so that the space between the inner wall of the air guide frame 41 and the outer wall of the guide frame 42 is divided into two parts. In particular, in spring and autumn, it is possible to choose to use only the controllable air intake component 40 in conjunction with the heat pipe and heat dissipation fins 373 for air cooling. At the same time, it is also possible to send coolant into the circulation channel 32 to accelerate the heat dissipation efficiency. In winter snowy weather, the coolant can be heated by the heating element. It is worth noting that the heating temperature should not be too high. Then the heated coolant is sent into the circulation channel 32 to raise the temperature of the photovoltaic module, thereby promoting the melting of snow on the surface of the photovoltaic module to avoid long-term accumulation.

[0053] It should be noted that when multiple photovoltaic modules are installed in the same row, preferably, the photovoltaic modules can be installed at a slight tilt or horizontally. When installing the controllable air intake component 40 and the heat conduction component 30, it is necessary to ensure that adjacent modules are staggered to guarantee that natural wind can flow within the controllable air intake component 40 under each photovoltaic module. Figure 13 As shown;

[0054] Specifically, during spring and autumn use, coolant can be left out of the circulation channel 32. In this state, heat dissipation is achieved solely through natural airflow. During this process, natural airflow enters the cavity between the guide frame 42 and the air guide frame 41 through the through hole 43 on one side of the air guide frame 41. Then, ventilation enters the inner cavity of the guide frame 42 through the through hole 43 on one side of the guide frame 42, thereby blowing towards the lower heat pipe 372 and the heat dissipation fins 373 in the inner cavity of the guide frame 42, thus carrying away heat and dissipating it to the external environment through the through hole 43 on the other side of the guide frame 42 and the air guide frame 41.

[0055] A shaft tube 45 is fixed at the center of the bottom of the air guide frame 41. The shaft tube 45 is hollow and a shaft rod 46 is inserted inside the shaft tube 45. One end of the shaft rod 46 passes through the air guide frame 41 and is fixed to the guide frame 42. Two driven sprockets 47 are mounted on the outer surfaces of the shaft tube 45 and the shaft rod 46. A mounting bracket 48 is mounted on the outer surface of the base. It is worth noting that the mounting bracket 48 will not affect the rotation of the air guide frame 41. At the same time, through slots are opened on both sides of the mounting bracket 48. When the air guide frame 41 rotates to the point where the through hole 43 on its surface is opposite to the inner wall of the mounting bracket 48, the through slots and the through hole 43 are aligned to ensure the normal passage of natural air.

[0056] like Figure 2 , Figure 11 and Figure 12As shown, two motors 49 are mounted on the bottom of the mounting bracket 48, and two drive sprockets are mounted on the inner wall of the mounting bracket 48 through two bearing seats. The output end of the motor 49 is connected to the bottom end of the drive sprocket. One drive sprocket is connected to one driven sprocket 47 located on the shaft 46 through a first chain, and the other drive sprocket is connected to one driven sprocket 47 located on the shaft tube 45 through a second chain.

[0057] Specifically, when multiple photovoltaic modules are arranged side by side, the shafts 46 and 45 at the bottom of all photovoltaic modules are connected by four driven sprockets 47 on the shaft 46 and 45 in conjunction with a chain. Figure 11 As shown, in this state, when the two motors 49 rotate, they will drive all the shafts 46 and shaft tubes 45 to rotate together. It should be noted that the rotation of the shafts 46 and shaft tubes 45 will not interfere with each other. That is, after they rotate independently, the rotation of one will not affect the other.

[0058] Specifically, since wind direction changes frequently during actual use, when the wind direction is easterly or westerly, the initial state should be maintained, i.e., Figure 12 In the direction shown, the natural wind from the east or west will enter the wind guide frame 41 through the through hole 43 on one side and exit through the through hole 43 on the other side, forming a through wind. During the flow, the wind will carry away the heat from the surface of the heat pipe 372 and the heat dissipation fins 373.

[0059] When the wind direction is south or north, the two motors 49 control the shaft 46 and shaft tube 45 to rotate 90° respectively. When the shaft 46 rotates, it will drive the air guide frame 41 to rotate together, and the shaft tube 45 will drive the guide frame 42 to rotate together. This will cause the through holes 43 on both sides of the air guide frame 41 and the guide frame 42 to rotate to the north-south direction. At this time, the natural wind from the south or north will enter the air guide frame 41 through the through hole 43 on one side and exit through the through hole 43 on the other side, forming a through wind. During the flow, the heat is carried away from the surface of the heat pipe 372 and the heat dissipation fins 373. It is worth noting that if the wind direction is northwest and southeast, or northeast and southwest, the motor 49 needs to control the shaft 46 and shaft tube 45 to rotate 45° clockwise or counterclockwise. At this time, it can correspond to the northwest and southeast wind or the northeast and southwest wind.

[0060] In particular, when the guide frame 42 is rotated independently, the position of the through holes 43 on both sides of the guide frame 42 can be adjusted to extend the residence time of natural wind in the guide frame 42 and optimize the heat dissipation effect.

[0061] Specifically, when this crystalline silicon tandem photovoltaic module is in operation / use:

[0062] Step 1: Assemble the substrate and battery

[0063] The base plate 10 is placed horizontally, and crystalline silicon cells 11 (with pre-installed interconnect strips on the surface) are evenly laid on its surface through the lower encapsulation film to ensure that there is no risk of short circuit between the cells.

[0064] A glass cover plate 12 is placed on top of the crystalline silicon cell 11 and bonded together with an upper encapsulation film to form a silicon-based module structure.

[0065] Step 2: Top Component Fabrication and Lamination

[0066] A semi-transparent perovskite solar cell 13 (with pre-formed interconnect strips on the surface) is deposited on the surface of the glass cover plate 12 and independently connected to the crystalline silicon solar cell 11 through an external circuit to form a four-terminal stacked structure.

[0067] The modules are fed into a laminator and laminated under low temperature and low pressure conditions to avoid degradation of the perovskite solar cells caused by high temperature, thus forming the final four-terminal stacked module.

[0068] Step 3: Install the frame and thermal conductive components 30

[0069] The aluminum frame 20 is wrapped around the edges of the base plate 10 and the glass cover plate 12 and fixed with sealant to provide structural support and sealing protection;

[0070] A heat-conducting component 30 is installed at the bottom of the base plate 10: a contact plate 31 is attached to the bottom of the base plate 10 and has a built-in circulation channel 32; an upper heat-conducting pipe 371 is embedded in the mounting groove of the contact plate 31, and the lower end is connected to the lower heat-conducting pipe 372 and the heat dissipation fins 373 (copper pipe material ensures efficient heat conduction).

[0071] Step 4: Connecting and Debugging the Heat Dissipation System

[0072] The liquid storage tank 33 is placed below the aluminum frame 20. The liquid inlet of the circulating water pump 34 is connected to the liquid inlet of the circulating channel 32 through the liquid delivery pipe 35, and the liquid outlet pipe 36 is connected to the liquid outlet of the circulating channel 32 and the liquid storage tank 33 to form a coolant circulation loop.

[0073] Start the circulating water pump 34 to test the summer liquid cooling mode: the coolant carries away heat through the circulation channel 32 and dissipates heat through the heat dissipation fins 373; in winter, the heating element is activated to heat the coolant and promote snow melting.

[0074] Step 5: Installation and airflow adjustment of the controllable air intake assembly 40

[0075] A controllable air inlet assembly 40 is rotatably connected to the bottom of the contact plate 31: the air guide frame 41 is rotatably connected to the shaft rod 46 through the shaft tube 45, the guide frame 42 is embedded in the air guide frame 41, and through holes 43 are provided on both sides and filter plates are installed.

[0076] According to the real-time wind direction (such as east wind / west wind / north-south wind / diagonal wind), the driven sprocket 47 is driven by the motor 49 to adjust the rotation angle of the air guide frame 41 and the guide frame 42 so that the through hole 43 is aligned with the wind direction, forming a through air channel to carry away the heat of the heat dissipation fins 373.

[0077] Step 6: Multi-component parallel adaptation settings

[0078] When multiple components are installed side by side, the heat-conducting components 30 of adjacent components are staggered to avoid obstruction of heat dissipation airflow.

[0079] All components are connected in series via the driven sprocket 47 of the shaft tube 45 and shaft 46, and are synchronously driven by the motor 49 to ensure consistent airflow adjustment of the multi-component heat dissipation system and avoid the heat island effect.

[0080] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A crystalline silicon tandem solar photovoltaic module, comprising a base plate (10), wherein crystalline silicon cells (11) are mounted on the base plate (10) through a lower encapsulating film, a junction box is fitted at the bottom edge of the base plate (10), and a glass cover plate (12) is mounted on the crystalline silicon cells (11) through an upper encapsulating film, characterized in that, The glass cover plate (12) is provided with a perovskite solar cell (13), and after being laminated and merged, it forms a four-end stacked assembly. The outer surfaces of the base plate (10) and the glass cover plate (12) are jointly fitted with an aluminum frame (20). A heat-conducting component (30) is installed at the bottom of the base plate (10). The heat-conducting component (30) includes a contact plate (31) assembled at the bottom of the base plate (10). The heat at the bottom of the base plate (10) is transferred downward through a conduction component (37) assembled on the contact plate (31). A controllable air intake component (40) is rotatably connected to the bottom of the contact plate (31). The controllable air intake assembly (40) includes a base fixed to the bottom of the contact plate (31), a guide frame (41) is rotatably connected to the lower surface of the base, a guide frame (42) is rotatably connected inside the guide frame (41), and the upper surface of the guide frame (42) is in contact with the bottom of the contact plate (31). Both sides of the guide frame (41) and the guide frame (42) are provided with through holes (43).

2. The crystalline silicon tandem solar photovoltaic module according to claim 1, characterized in that, The conductive component (37) includes an upper heat pipe (371). The upper surface of the contact plate (31) is provided with an installation groove that is compatible with the upper heat pipe (371), so that the upper heat pipe (371) can be installed on the contact plate (31). The upper surface of the upper heat pipe (371) is in contact with the bottom of the base plate (10). The two ends of the upper heat pipe (371) that penetrate into the controllable air intake component (40) are jointly equipped with a lower heat pipe (372). The lower heat pipe (372) is equipped with multiple heat dissipation fins (373).

3. A crystalline silicon tandem solar photovoltaic module according to claim 2, characterized in that, The contact plate (31) has a circulation channel (32) corresponding to the mounting groove, and the mounting groove is connected to the circulation channel (32). The aluminum frame (20) is provided with a liquid storage tank (33) below it. The liquid storage tank (33) is provided with a circulating water pump (34). The output end of the circulating water pump (34) is connected to the inlet of the circulation channel (32) through a delivery pipe (35). The input end of the circulating water pump (34) is equipped with a suction pipe with one end inside the liquid storage tank (33), and the outlet of the circulation channel (32) is connected to the liquid storage tank (33) through a discharge pipe (36).

4. A crystalline silicon tandem solar photovoltaic module according to claim 1, characterized in that, Two blocking blocks (44) are fixed on the outer wall of the guide frame (42) and fit against the inner wall of the air guide frame (41), so that the space between the inner wall of the air guide frame (41) and the outer wall of the guide frame (42) is divided into two parts.

5. A crystalline silicon tandem solar photovoltaic module according to claim 4, characterized in that, A shaft tube (45) is fixed at the center of the bottom of the air guide frame (41), and a shaft rod (46) is inserted into the shaft tube (45). One end of the shaft rod (46) passes through the air guide frame (41) and is fixed to the guide frame (42).

6. A crystalline silicon tandem solar photovoltaic module according to claim 5, characterized in that, The outer surfaces of the shaft tube (45) and shaft rod (46) are each equipped with two driven sprockets (47). The outer surface of the base is equipped with a mounting bracket (48), and the bottom of the mounting bracket (48) is equipped with two motors (49). The inner wall of the mounting bracket (48) is equipped with two driving sprockets through two bearing seats. The output end of the motor (49) is connected to the bottom end of the driving sprocket.

7. A crystalline silicon tandem solar photovoltaic module according to claim 6, characterized in that, One of the driving sprockets is connected to one of the driven sprockets (47) located on the shaft (46) via a first chain, and the other driving sprocket is connected to one of the driven sprockets (47) located on the shaft tube (45) via a second chain.

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