Perovskite-crystalline silicon composite photovoltaic module

Abstract

The invention provides a perovskite-crystalline silicon composite photovoltaic module which comprises a perovskite thin film module arranged on an outer glass substrate of the photovoltaic module and a crystalline silicon module arranged behind the perovskite thin film module. The first group of junction boxes correspond to the perovskite assembly, the second group of junction boxes correspond to the crystal silicon assembly, the second group of junction boxes comprises a left junction box, a middle junction box, a right junction box and a voltage conversion junction box, the voltage conversion junction box is connected with one junction box in an inserted mode, and a voltage conversion module is arranged in the voltage conversion junction box. According to the perovskite-crystalline silicon composite photovoltaic module, electric energy generated by the crystalline silicon photovoltaic module can reach a current value close to that of the perovskite thin film photovoltaic module after voltage conversion, then the electric energy and the crystalline silicon photovoltaic module are gathered together through the connector, and rapid connection between the modules can be realized, so that on one hand, the use of cables and the connector can be saved; the cost is reduced; in addition, replacement can be conveniently carried out according to different component specifications, and assembly and maintenance are more convenient.

Description

Technical Field

[0001] The present invention relates to the field of solar photovoltaic power generation technology, and in particular to a perovskite-crystalline silicon composite photovoltaic module. Background Art

[0002] The photovoltaic power generation system is a power generation system that directly converts solar energy into electrical energy. It can take into account both economic development and ecological protection while generating clean electricity. It is currently widely used in a variety of scenarios. It is one of the important clean energy sources to replace traditional fossil energy and has broad development prospects.

[0003] Photovoltaic power generation system is to connect photovoltaic modules through cables to form a module array, and then directly provide the electricity generated by photovoltaic modules to the power load or connect it to the power grid through branch lines, busbars, DC / AC conversion. Since crystalline silicon solar cells and modules are the most mature and low-cost, and with the continuous improvement of technology and processes, the photoelectric conversion efficiency of crystalline silicon modules is getting higher and higher, so in the current photovoltaic power generation system, crystalline silicon modules are still the main type of modules used; and as the difference between the power generation cost of crystalline silicon modules and the cost per kilowatt-hour of thermal power generation continues to narrow, it can be foreseen that they will still occupy the vast majority of the market share at present and for a considerable period of time in the future.

[0004] In recent years, another type of photovoltaic module, the perovskite photovoltaic module, has received more and more attention. It is mainly formed by printing, scraping, and drying liquid materials on a glass substrate to form a very thin film. This material has a large electron-hole diffusion length and a light absorption coefficient that is much better than that of crystalline silicon. The direct band gap reaches 1.50-1.55eV, and can absorb photons with a wavelength of less than 800nm. The absorption coefficient of the film material in the visible light part reaches 104-105cm-1. In addition, the film has the advantages of low cost, high carrier mobility, large diffusion length, and few crystal defects. Its conversion efficiency will greatly exceed that of crystalline silicon. In addition to its advantages in conversion efficiency, its manufacturing process is also simpler than that of crystalline silicon, and it uses less materials. Therefore, the cost of power generation of perovskite photovoltaic modules is even lower than that of thermal power generation.

[0005] In addition, since the perovskite film is transparent, it can be printed on the glass substrate of the outer layer of the crystalline silicon module, and it will not have a substantial impact on the absorption of sunlight by crystalline silicon. Therefore, the perovskite film module is made on the outer glass substrate of the traditional crystalline silicon module, and it can be packaged together with the crystalline silicon photovoltaic module to make a perovskite-crystalline silicon composite photovoltaic module. Compared with the crystalline silicon module, the perovskite module has a higher open circuit voltage, which can reach about 200V, but the short circuit current is very small, generally around 2A; the open circuit voltage of the crystalline silicon module is generally around 60V, but it has a relatively high short circuit current, which can reach about 15-20A.

[0006] In photovoltaic systems, junction boxes are needed to lead out the electricity generated by photovoltaic modules and connect it to external loads. Therefore, photovoltaic module junction boxes are key components for photovoltaic modules to build various power generation systems. As for perovskite-crystalline silicon composite modules, when working, perovskite thin-film modules and crystalline silicon battery modules work independently, and the electrical parameters of the two (open-circuit voltage, short-circuit current) are very different. Therefore, for the junction box system that outputs the power of such components, generally only two sets of junction boxes can be used to output the electricity generated by perovskite thin-film modules and crystalline silicon modules respectively, and then one of the voltages is transformed and converted to the other voltage and merged with the busbar of the photovoltaic power generation system. This will This leads to two problems. First, more cables are needed when assembling the photovoltaic system, which will not only increase the system materials and installation costs, but also cause system line disorder and inconvenience in maintenance. Second, a large-sized transformer needs to be installed on each bus branch, which requires many components for installing the transformer in the photovoltaic power generation system, making the photovoltaic power generation system more complicated. Or, to connect and package the transformer in one piece on each component bus branch cable, special cables are needed to achieve this, and the manufacturing process is complicated. These are not conducive to the widespread application of perovskite-crystalline silicon composite components in photovoltaic power generation systems. Summary of the invention

[0007] The purpose of the present invention is to provide a perovskite-crystalline silicon composite photovoltaic module that is easy to install and maintain the photovoltaic power generation system and can reduce the system construction cost in response to the application requirements of the perovskite-crystalline silicon composite photovoltaic module in the photovoltaic power generation system.

[0008] To achieve the above object, the present invention adopts the following technical solutions: A perovskite-crystalline silicon composite photovoltaic module, comprising a perovskite thin-film photovoltaic module arranged on an outer glass substrate of the photovoltaic module and a crystalline silicon photovoltaic module arranged behind the perovskite thin-film photovoltaic module; a first group of junction boxes and a second group of junction boxes arranged on the back of the module, the first group of junction boxes corresponding to the perovskite thin-film photovoltaic module, comprising a first junction box and a second junction box, a first connector connected to the first junction box and a second connector connected to the second junction box; the second group of junction boxes corresponding to the crystalline silicon battery module, comprising a left junction box, a middle junction box, a right junction box and a voltage conversion junction box plugged into one of the junction boxes; The first junction box and the second junction box are provided with connection terminals for connecting with the busbars and connector cables of the perovskite thin-film photovoltaic modules; The left junction box, the middle junction box and the right junction box are all provided with a first conductive terminal, a second conductive terminal and a bypass protection device provided between the first conductive terminal and the second conductive terminal; the conductive terminals in the left junction box, the middle junction box and the right junction box form a series structure on the circuit through the photovoltaic module busbar; The wiring box plugged into the voltage conversion wiring box among the left wiring box, the middle wiring box and the right wiring box is provided with a circuit adapter board, the circuit adapter board is provided with a first terminal and a second terminal, a terminal in one of the other two wiring boxes is connected and fixed to the first terminal through a cable, and a terminal in the other wiring box is connected and fixed to the second terminal through a cable; the wiring box plugged into the voltage conversion wiring box is provided with a connector plug and a connector socket electrically connected to the first terminal and the second terminal respectively on one side of the voltage conversion wiring box opposite to the voltage conversion wiring box, and the connector plug and the connector socket are also provided on the circuit adapter board; A circuit board is arranged in the voltage conversion junction box, on which are arranged a third terminal, a fourth terminal, a voltage conversion module, and a connector socket and a connector plug respectively plugged with the connector plug and the connector socket on the junction box plugged with the voltage conversion junction box; the third connector is connected to the third terminal through a cable, and the fourth connector is connected to the fourth terminal through a cable; the electric energy drawn from the crystalline silicon photovoltaic module is transformed and converted by the voltage conversion module and then transmitted to the outside through the third terminal and the fourth terminal.

[0009] Preferably, the junction box in the second group of junction boxes that is plugged into the voltage conversion junction box is a middle junction box. In this case, a terminal in the left junction box is connected and fixed to the first terminal post via a cable, and a terminal in the right junction box is connected and fixed to the second terminal post via a cable; a connector plug and a connector socket that are electrically connected to the first terminal post and the second terminal post, respectively, are provided on one side of the middle junction box relative to the voltage conversion junction box.

[0010] More preferably, the first junction box and the second junction box in the first group of junction boxes are both provided with a first junction terminal and a second junction terminal, and a bypass protection device is provided between the first junction terminal and the second junction terminal.

[0011] More preferably, a side of the box body of the middle junction box, facing the side of the voltage conversion junction box, is provided with a protrusion plugged into the box body of the voltage conversion junction box, and correspondingly, a groove that cooperates and fixes with the protrusion is formed on the side of the box body of the voltage conversion junction box.

[0012] More preferably, the middle junction box and the voltage conversion junction box have an integral box cover, and when the middle junction box and the voltage conversion junction box are plugged and assembled, the integral box cover is covered on the middle junction box and the voltage conversion junction box, and a sealing ring is provided between the integral box cover and the middle junction box and the voltage conversion junction box.

[0013] More preferably, the middle junction box and the voltage conversion junction box are each provided with an independent box cover, and the box cover of the voltage conversion junction box located above has a protruding plate extending to a part of the middle junction box below, and the protruding plate is tightly fitted with the top of the middle junction box to cover the docking part of the middle junction box and the voltage conversion junction box.

[0014] More preferably, the first connector and the third connector are plug-connected with the T-shaped connector plug, and the second connector and the fourth connector are plug-connected with the T-shaped connector socket; the T-shaped connector plug and the T-shaped connector socket are both of a "one-to-two" structure; when the photovoltaic power generation system is assembled, the T-shaped connector plugs and T-shaped connector sockets on adjacent components are plug-connected with each other.

[0015] More preferably, the current magnitude of the electric energy generated by the crystalline silicon photovoltaic module after conversion by the voltage conversion junction box is within 10% of the current magnitude generated by the perovskite thin film photovoltaic module.

[0016] The beneficial effects of the present invention are that the perovskite-crystalline silicon composite photovoltaic module is structurally and circuitly connected to the voltage conversion junction box in a board-to-board plug-in manner on the crystalline silicon photovoltaic module junction box, and the electric energy generated by the crystalline silicon photovoltaic module is converted into a current value close to that of the perovskite thin-film photovoltaic module after voltage conversion, and then collected together through a connector to achieve rapid connection between components. On the one hand, it can save the use of cables and connectors between the box bodies and reduce costs; in addition, the voltage conversion junction box using a plug-in method can also be easily replaced according to different component specifications, and assembly and maintenance are more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 Shown is a schematic structural diagram of a perovskite-crystalline silicon composite photovoltaic module of the present invention (back side of the module); Figure 2 Shown Figure 1A schematic diagram of the structure of the first set of junction boxes of the perovskite-crystalline silicon composite photovoltaic module; Figure 3 Shown Figure 1 A schematic diagram of the structure of the second set of junction boxes of the perovskite-crystalline silicon composite photovoltaic module; Figure 4 Shown is a schematic diagram of the internal structure of a middle junction box in the second group of junction boxes; Figure 5 Shown is a schematic diagram of the internal structure of a voltage conversion junction box in the second group of junction boxes; Figure 6 It is a schematic structural diagram of connecting adjacent perovskite-crystalline silicon composite photovoltaic modules according to an embodiment of the present invention; Figure 7 Shown is a schematic diagram of the circuit connection structure of the perovskite-crystalline silicon composite photovoltaic module of the present invention; Figure 8 The figure shows a schematic structural diagram of an assembled middle junction box and a voltage conversion junction box according to an embodiment of the present invention. DETAILED DESCRIPTION

[0019] In order to provide a further understanding of the purpose, structure, features, and functions of the present invention, the following detailed description is given in conjunction with the embodiments.

[0020] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0021] Reference Figure 1-Figure 3As shown, a perovskite-crystalline silicon composite photovoltaic module 100 according to an embodiment of the present invention includes a perovskite thin-film photovoltaic module arranged on an outer glass substrate of the photovoltaic module and a crystalline silicon photovoltaic module arranged behind the perovskite thin-film photovoltaic module; a first group of junction boxes 10 and a second group of junction boxes 20 arranged on the back of the module 100, wherein the first group of junction boxes corresponds to the perovskite thin-film photovoltaic module, and includes a first junction box 11 and a second junction box 12, a first connector 13 connected to the first junction box 11 and a second connector 14 connected to the second junction box 12; the second group of junction boxes 20 corresponds to the crystalline silicon battery module, and includes a left junction box 21, a middle junction box 22, and a right junction box 23. 2. The right junction box 23 and the voltage conversion junction box 24 plugged into the middle junction box 22; the first junction box 11 and the second junction box 12 are provided with the busbars and the connector cable connection terminals for the perovskite thin-film photovoltaic modules; the left junction box 21, the middle junction box 22 and the right junction box 23 are provided with the first conductive terminal 201, the second conductive terminal 202 and the bypass protection device (such as a bypass diode) 203 arranged between the first conductive terminal 201 and the second conductive terminal 202; the conductive terminals in the left junction box 21, the middle junction box 22 and the right junction box 23 form a series structure on the circuit through the photovoltaic module busbar; see Figure 4 The middle junction box 22 is provided with a circuit adapter board 221, and a first terminal 225 and a second terminal 226 are provided on the circuit adapter board 224. A terminal in the left junction box 21 is connected and fixed to the first terminal 225 through a cable, and a terminal in the right junction box 23 is connected and fixed to the second terminal 225 through a cable; a connector plug 222 and a connector socket 223 which are respectively electrically connected to the first terminal 225 and the second terminal 226 are provided on one side of the middle junction box 22 relative to the voltage conversion junction box 24, and the connector plug 222 and the connector socket 223 are also provided on the circuit adapter board 221; the voltage conversion junction box 24 is provided with a circuit board 241, on which are provided a third terminal 245, a fourth terminal 246, a voltage conversion module 244, and a connector socket 242 and a connector plug 243 respectively plugged with the connector plug 222 and the connector socket 223 on the intermediate line box, the third connector 25 is connected to the third terminal 245 through a cable, and the fourth connector 26 is connected to the fourth terminal 246 through a cable; the power drawn from the junction box 22 is transformed and converted by the voltage conversion module 244 and then transmitted to the outside through the third terminal 245 and the fourth terminal 246.

[0022] In the present invention, since the short-circuit current of the perovskite thin-film photovoltaic module is relatively small, generally only about 2A, even if the layout is blocked to produce a "hot spot" effect, it will not generate high heat locally and cause the module to burn out like the crystalline silicon photovoltaic module. Therefore, for the first junction box 11 and the second junction box 12 in the first group of junction boxes, only positive and negative terminals can be set therein, and there is no need to set a bypass protection device. It should be understood that if the short-circuit current increases with the improvement of the conversion efficiency of the perovskite thin-film photovoltaic module; or for strict safety protection considerations, a bypass protection device can also be set between the positive and negative terminals.

[0023] In addition, refer to Figure 4 and Figure 5 In order to facilitate the plug-in installation between the middle junction box 22 and the voltage conversion junction box 24 and ensure the connection effect, a protrusion 227 plugged into the box body of the voltage conversion junction box 24 is provided on the side of the box body 220 of the middle junction box 22, facing the side of the voltage conversion junction box 24. Correspondingly, a groove 247 cooperating with the protrusion 227 is formed on the side of the box body 240 of the voltage conversion junction box 24. In a preferred embodiment, the middle junction box 22 and the voltage conversion junction box 24 have an integral box cover (not shown). After the middle junction box 22 and the voltage conversion junction box 24 are plugged in and assembled, the integral box cover is covered on the middle junction box 22 and the voltage conversion junction box 24. A sealing ring is provided between the integral box cover and the middle junction box 22 and the voltage conversion junction box 24, so as to prevent external water vapor from entering the interior and causing adverse effects on the connector plug-in part between the two box bodies. Or as Figure 8 As shown, the middle junction box 22 and the voltage conversion junction box 24 are each provided with an independent box cover. The box cover of the voltage conversion junction box 24 located at the top has a protruding plate extending to a part of the middle junction box 22 below. The protruding plate is tightly fitted with the top of the middle junction box 22 to cover the docking part of the middle junction box 22 and the voltage conversion junction box 24, and can also prevent external water vapor from entering the interior and causing adverse effects on the connector plug-in part between the two box bodies.

[0024] In the above embodiment, the voltage conversion junction box is plugged into the middle junction box. It should be understood that the voltage conversion junction box can also be plugged into the left junction box or the right junction box. In this case, it is only necessary to set the left junction box or the right junction box according to the structure of the above-mentioned middle junction box. This should be regarded as an equivalent technical solution.

[0025] Combination Figure 6 and Figure 7, a schematic diagram of the circuit connection structure of the perovskite-crystalline silicon composite photovoltaic module of the present invention is shown, for the first group of junction boxes 10 for extracting power from the perovskite thin-film photovoltaic module, the first terminal 101 and the second terminal 102 in the first junction box 11 and the second junction box 12 are connected to the module busbar to form a series connection, the first terminal 101 in the first junction box 11 is connected to the first connector 13 through a cable, and the second terminal 102 in the second junction box 12 is connected to the second connector 14 through a cable; for the crystalline silicon photovoltaic module power The first conductive terminal 201 and the second conductive terminal 202 in the left junction box 21, the middle junction box 22 and the right junction box 23 are connected in series with the battery string and the busbar in the assembly. The first conductive terminal 201 in the left junction box is electrically connected to the first terminal 225 on the circuit adapter board 221 through a cable, and the second conductive terminal 202 in the right junction box is electrically connected to the second terminal 226 on the circuit adapter board 221 through a cable. The first terminal 225 and the second terminal 226 are respectively connected to the first terminal 225 and the second terminal 226 on the circuit adapter board 221. The connector plug 222 is electrically connected to the connector socket 223; the connector socket 242 and the connector plug 243 on the circuit board 241 provided in the voltage conversion junction box 24 are respectively plugged with the connector plug 222 and the connector socket 223 to form an electrical connection, and the power drawn from the junction box 22 is transformed and converted by the voltage conversion module 244 and then transmitted to the outside through the third terminal 245 and the fourth terminal 246. The third connector 25 is connected to the third terminal 245 through a cable, and the fourth connector 26 is connected to the fourth terminal 246 through a cable; the first connection The connector 13 and the third connector 25 are plugged into the T-connector plug 32, and the second connector 14 and the fourth connector 26 are plugged into the T-connector socket 31; the T-connector plug 32 and the T-connector socket 31 are both of a "one-to-two" structure, that is, they have two input terminals and one output terminal; when the photovoltaic power generation system is assembled, the T-connector plugs 32 and the T-connector sockets 31 on adjacent components are plugged into each other, so that a perovskite-crystalline silicon composite photovoltaic component power generation array can be formed, and finally converged to the busbar of the power generation system.

[0026] The perovskite-crystalline silicon composite photovoltaic module of the present invention is provided with two sets of junction boxes corresponding to the respective characteristics of the perovskite thin film photovoltaic module and the crystalline silicon photovoltaic module; for the low voltage and high current crystalline silicon photovoltaic module, a voltage conversion junction box is provided, and the electric energy generated by the crystalline silicon photovoltaic module is converted to a current value close to the perovskite thin film photovoltaic module after voltage conversion, and then the electric energy is collected together through the connector and the quick connection between the components can be realized, which is not only convenient for assembly and maintenance, but also saves a large amount of cables, saves costs and simplifies the power generation system. In a preferred embodiment, the electric energy generated by the crystalline silicon photovoltaic module is converted by the voltage conversion junction box and the electric energy generated by the perovskite thin film photovoltaic module. The difference is within 10%. In addition, the present invention converts the electric energy of the crystalline silicon photovoltaic module with low voltage and high current to high voltage and low current, and the power loss caused by the smaller current during the power transmission process will be smaller, and the heat generation of the device will also be reduced.

[0027] The voltage conversion junction box of the present invention adopts a board-to-board plug-in structure to achieve structural and circuit connection with the middle junction box. On the one hand, it can save the use of cables and connectors between the box bodies and reduce costs; in addition, the voltage conversion junction box using a plug-in method can also be conveniently replaced according to different component specifications. Due to different composite components, the power generation efficiency of perovskite thin-film photovoltaic components and crystalline silicon photovoltaic components will be different, and voltage conversion modules of different specifications need to be used. At this time, voltage conversion junction boxes of different specifications can be directly used without changing other parts of the component.

[0028] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A perovskite-crystalline silicon composite photovoltaic module, characterized in that: The composite photovoltaic module includes a perovskite thin-film photovoltaic module arranged on the outer glass substrate of the photovoltaic module and a crystalline silicon photovoltaic module arranged behind the perovskite thin-film photovoltaic module; a first group of junction boxes and a second group of junction boxes are arranged on the back of the module, the first group of junction boxes corresponds to the perovskite thin-film photovoltaic module, and includes a first junction box and a second junction box, a first connector connected to the first junction box and a second connector connected to the second junction box; the second group of junction boxes corresponds to the crystalline silicon battery module, and includes a left junction box, a middle junction box, a right junction box and a voltage conversion junction box plugged into one of the junction boxes; The first junction box and the second junction box are provided with connection terminals for connecting with the busbars and connector cables of the perovskite thin-film photovoltaic modules; The left junction box, the middle junction box and the right junction box are all provided with a first conductive terminal, a second conductive terminal and a bypass protection device provided between the first conductive terminal and the second conductive terminal; the conductive terminals in the left junction box, the middle junction box and the right junction box form a series structure on the circuit through the photovoltaic module busbar; The wiring box plugged into the voltage conversion wiring box among the left wiring box, the middle wiring box and the right wiring box is provided with a circuit adapter board, the circuit adapter board is provided with a first terminal and a second terminal, a terminal in one of the other two wiring boxes is connected and fixed to the first terminal through a cable, and a terminal in the other wiring box is connected and fixed to the second terminal through a cable; the wiring box plugged into the voltage conversion wiring box is provided with a connector plug and a connector socket electrically connected to the first terminal and the second terminal respectively on one side of the voltage conversion wiring box opposite to the voltage conversion wiring box, and the connector plug and the connector socket are also provided on the circuit adapter board; A circuit board is arranged in the voltage conversion junction box, on which are arranged a third terminal, a fourth terminal, a voltage conversion module, and a connector socket and a connector plug respectively plugged with the connector plug and the connector socket on the junction box plugged with the voltage conversion junction box; the third connector is connected to the third terminal through a cable, and the fourth connector is connected to the fourth terminal through a cable; the electric energy drawn from the crystalline silicon photovoltaic module is transformed and converted by the voltage conversion module and then transmitted to the outside through the third terminal and the fourth terminal.

2. A perovskite-crystalline silicon composite photovoltaic module according to claim 1, characterized in that: The junction box in the second group of junction boxes that is plugged into the voltage conversion junction box is the middle junction box. At this time, a terminal in the left junction box is connected and fixed to the first terminal post through a cable, and a terminal in the right junction box is connected and fixed to the second terminal post through a cable; a connector plug and a connector socket that are electrically connected to the first terminal post and the second terminal post respectively are provided on one side of the middle junction box relative to the voltage conversion junction box.

3. A perovskite-crystalline silicon composite photovoltaic module according to claim 1 or 2, characterized in that: The first junction box and the second junction box in the first group of junction boxes are both provided with a first junction terminal and a second junction terminal, and a bypass protection device is provided between the first junction terminal and the second junction terminal.

4. A perovskite-crystalline silicon composite photovoltaic module as claimed in claim 2, characterized in that: The side of the box body of the middle junction box, facing the side of the voltage conversion junction box, is provided with a protrusion plugged into the box body of the voltage conversion junction box, and correspondingly, a groove is formed on the side of the box body of the voltage conversion junction box to cooperate with the protrusion.

5. A perovskite-crystalline silicon composite photovoltaic module as claimed in claim 4, characterized in that: The middle junction box and the voltage conversion junction box have an integral box cover. When the middle junction box and the voltage conversion junction box are plugged and assembled, the integral box cover is covered on the middle junction box and the voltage conversion junction box. A sealing ring is provided between the integral box cover and the middle junction box and the voltage conversion junction box.

6. A perovskite-crystalline silicon composite photovoltaic module as claimed in claim 4, characterized in that: The middle junction box and the voltage conversion junction box are each provided with an independent box cover. The box cover of the voltage conversion junction box located above has a protruding plate extending to a part of the middle junction box below. The protruding plate is tightly matched with the top of the middle junction box to cover the docking part of the middle junction box and the voltage conversion junction box.

7. A perovskite-crystalline silicon composite photovoltaic module according to claim 1, characterized in that: The first connector and the third connector are plug-connected with the T-type connector plug, and the second connector and the fourth connector are plug-connected with the T-type connector socket; the T-type connector plug and the T-type connector socket are both "one to two" structures; when the photovoltaic power generation system is assembled, the T-type connector plugs and T-type connector sockets on adjacent components are plug-connected with each other.

8. A perovskite-crystalline silicon composite photovoltaic module according to claim 1, characterized in that: The current magnitude of the electric energy generated by the crystalline silicon photovoltaic module after conversion by the voltage conversion junction box is within 10% of the current magnitude generated by the perovskite thin-film photovoltaic module.

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