Photovoltaic power generation module and photovoltaic power generation system

Abstract

The utility model provides a photovoltaic power generation module and a photovoltaic power generation system. The photovoltaic power generation module comprises a laminated photovoltaic module and an electric energy conversion device. The laminated photovoltaic assembly comprises a first battery assembly and a second battery assembly which are arranged in a laminated mode, one of the first battery assembly and the second battery assembly is a wide-band-gap battery assembly, and the other one is a narrow-band-gap battery assembly. By adopting the design scheme provided by the utility model, on the basis of not transforming the first battery assembly and the second battery assembly, the output voltage of the first battery assembly and the output voltage of the second battery assembly are matched and adjusted through the electric energy conversion device, so that the system suitability of the whole laminated photovoltaic assembly is improved. Therefore, loss caused by transformation of the first battery assembly and the second battery assembly and mismatch loss caused by influence of environmental factors can be avoided, the power generation efficiency of the laminated photovoltaic assembly can be improved, and the power generation efficiency of the whole photovoltaic power generation module can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of energy, and in particular to a photovoltaic power generation module and a photovoltaic power generation system. Background Art

[0002] The photoelectric conversion efficiency of crystalline silicon cells currently available for mass production is approaching its limit, while the theoretical upper limit of the photoelectric conversion efficiency of perovskite cells is relatively high. Therefore, the technology of stacking perovskite cells with crystalline silicon cells can reuse existing crystalline silicon cell production lines while also boosting the efficiency of photovoltaic modules containing crystalline silicon cells. This technology is expected to further improve the efficiency and reduce the cost of photovoltaic modules, and is therefore an important development direction for the next generation of high-efficiency photovoltaic modules.

[0003] However, due to the significant differences in the IV output characteristics of perovskite cells and crystalline silicon cells, current stacked modules of perovskite cells and crystalline silicon cells face downstream inverter interface adaptation issues. In practical applications, they are also susceptible to environmental factors, leading to mismatch issues. Utility Model Content

[0004] The utility model provides a photovoltaic power generation module and a photovoltaic power generation system, which are used to improve the system adaptability of laminated photovoltaic components, thereby improving the power generation efficiency of the photovoltaic power generation system.

[0005] In a first aspect, the utility model provides a photovoltaic power generation module, which includes a laminated photovoltaic assembly and an electric energy conversion device. The laminated photovoltaic assembly includes a first battery assembly and a second battery assembly arranged in a stacked manner, one of the first battery assembly and the second battery assembly is a wide bandgap battery assembly, and the other of the first battery assembly and the second battery assembly is a narrow bandgap battery assembly. The electric energy conversion device includes a voltage adaptation unit and an electric energy conversion unit, wherein the output end of the voltage adaptation unit is connected to the input end of the electric energy conversion unit. The output end of the first battery assembly is connected to the input end of the voltage adaptation unit, and the voltage adaptation unit is used to adjust the output voltage of the output end of the first battery assembly. The output end of the second battery assembly is connected to the output end of the voltage adaptation unit and to the input end of the electric energy conversion unit, and the electric energy conversion power supply is used to adjust the output voltage of the output end of the second battery assembly.

[0006] The photovoltaic power generation module design provided by this utility model allows the output voltage of the first and second battery assemblies to be matched and adjusted by the power conversion device without modifying the first and second battery assemblies, thereby improving the system adaptability of the entire laminated photovoltaic module. This effectively avoids the losses caused by modifying the first and second battery assemblies, as well as the mismatch losses caused by environmental factors, which is conducive to improving the power generation efficiency of the laminated photovoltaic module and, in turn, the power generation efficiency of the entire photovoltaic power generation module.

[0007] In one possible implementation of the present invention, the voltage adaptor unit is further configured to adjust the port voltage of the first battery assembly to a voltage corresponding to the maximum power value of the first battery assembly during operation. This allows the first battery assembly to always operate at an optimal power state, which helps improve the photoelectric conversion efficiency of the first battery assembly and, therefore, the power generation efficiency of the laminated photovoltaic module.

[0008] In one possible implementation of the present invention, the power conversion unit is further configured to adjust the port voltage of the second battery assembly to a voltage corresponding to the maximum power value of the second battery assembly during operation. This allows the second battery assembly to always operate at an optimal power state, which helps improve the photoelectric conversion efficiency of the second battery assembly and, therefore, the power generation efficiency of the laminated photovoltaic module.

[0009] In one possible implementation of the present invention, a photovoltaic power generation module includes a laminated photovoltaic module, and the power conversion unit is a DC-to-AC conversion unit. The power conversion unit is further configured to convert the DC power generated by the laminated photovoltaic module into AC power for output. This allows the photovoltaic power generation module to meet grid connection requirements or load requirements.

[0010] In addition, the power conversion unit can also be a DC-to-DC conversion unit, which is used to convert the voltage and current of the DC power converted by the laminated photovoltaic module and output it. This allows the photovoltaic power generation module to meet the input requirements of the inverter, thereby improving the system adaptability of the entire photovoltaic power generation module.

[0011] Since laminated photovoltaic modules typically include a junction box, in one possible implementation of the present invention, the power conversion device can be disposed within the junction box, thereby connecting the power conversion device and the laminated photovoltaic module within the junction box. This allows for an integrated design of the power conversion device and the laminated photovoltaic module, facilitating on-site assembly of the photovoltaic power generation module and improving assembly efficiency.

[0012] In one possible implementation of the present invention, a photovoltaic power generation module includes a plurality of stacked photovoltaic modules, wherein the first cell modules in the plurality of stacked photovoltaic modules are connected in series to form a first cell string, wherein the output end of the first cell string is connected to the input end of a voltage adaptation unit, and the voltage adaptation unit is used to adjust the output voltage of the output end of the first cell string. The second cell modules in the plurality of stacked photovoltaic modules are connected in series to form a second cell string, wherein the output end of the second cell string is connected to the output end of the voltage adaptation unit and to the input end of an electric energy conversion unit, and the electric energy conversion power supply is used to adjust the output voltage of the output end of the second cell module. Thus, it can be seen that by adopting the design of the photovoltaic power generation module provided by the present invention, the regulation of the plurality of stacked photovoltaic modules can also be achieved through a single electric energy conversion device, which can still achieve matching regulation of the output voltage of the first cell string and the output voltage of the second cell string, thereby improving the system adaptability of the entire photovoltaic power generation module, thereby improving the power generation efficiency of the entire photovoltaic power generation module, and further improving the power generation efficiency of the entire photovoltaic power generation system.

[0013] In addition, the voltage adaptation unit is further configured to adjust the port voltage of the first battery string to a voltage corresponding to the maximum power value of the first battery string during operation. This allows the first battery string to always operate at an optimal power state, which helps improve the photoelectric conversion efficiency of the first battery string, thereby improving the power generation efficiency of the photovoltaic power generation module.

[0014] The power conversion unit is also used to adjust the port voltage of the second battery string to a voltage corresponding to the maximum power value of the second battery string during operation. This allows the second battery string to always operate at an optimal power state, which helps improve the photoelectric conversion efficiency of the second battery string and thus improve the power generation efficiency of the photovoltaic power generation module.

[0015] In the photovoltaic power generation system provided by the present invention, when the power conversion unit is a DC to AC conversion unit, the power conversion unit is also used to convert the DC power generated by the multiple stacked photovoltaic modules into AC power for output. This allows the photovoltaic power generation module to meet grid connection requirements or load usage requirements.

[0016] In another possible implementation, when the power conversion unit can also be a DC-to-DC conversion unit, the power conversion unit is further configured to convert the voltage and current of the DC power converted by the multiple stacked photovoltaic modules and output them. This allows the photovoltaic power generation module to meet the input requirements of the inverter, thereby improving the system adaptability of the entire photovoltaic power generation module.

[0017] In a second aspect, the present invention further provides a photovoltaic power generation system comprising the photovoltaic power generation module of the first aspect. In this photovoltaic power generation system, the photovoltaic power generation module has better system adaptability, which is conducive to improving the power generation efficiency of the photovoltaic power generation module, thereby improving the power generation efficiency of the entire photovoltaic power generation system.

[0018] In one possible implementation of the present invention, when the electric energy conversion unit is a DC to DC conversion unit, the photovoltaic power generation system also includes an inverter, and the output end of the above-mentioned DC to DC conversion unit is connected to the input end of the inverter, and the inverter can be used to convert the DC power it receives into AC power and then transmit it into the power grid or provide it to the load.

[0019] In one possible implementation of the present invention, when a photovoltaic power generation system includes multiple photovoltaic power generation modules, and the power conversion units of these modules are all DC-to-DC conversion units, the output terminals of the power conversion units of these modules are connected in series and then connected to the input terminals of an inverter. This can help increase the power generation capacity of the photovoltaic power generation system and enable the inverter to convert the DC power output by the power conversion devices of the multiple photovoltaic power generation modules into AC power for transmission to the power grid or to supply to a load. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic structural diagram of a photovoltaic power generation system provided by an embodiment of the present utility model;

[0021] Figure 2 A schematic structural diagram of a laminated photovoltaic module provided by an embodiment of the present utility model;

[0022] Figure 3 A schematic structural diagram of a photovoltaic power generation module provided by an embodiment of the present utility model;

[0023] Figure 4 Another structural schematic diagram of a photovoltaic power generation module provided by an embodiment of the present utility model;

[0024] Figure 5 Another structural schematic diagram of a photovoltaic power generation module provided in an embodiment of the utility model.

[0025] Reference numerals:

[0026] 1000-PV power generation system; 100-PV string; 200-DC converter; 300-inverter; 2000-grid-connected transformer; 3000-grid;

[0027] 4000-load;

[0028] 10- Photovoltaic module / laminated photovoltaic module; 10a- first laminated photovoltaic module; 10b- second laminated photovoltaic module;

[0029] 1-first battery assembly / wide bandgap battery assembly; 11-first positive terminal; 12-first negative terminal;

[0030] 2-second battery assembly / narrow bandgap battery assembly; 21-third positive terminal; 22-third negative terminal;

[0031] 3-first encapsulation film; 4-second encapsulation film; 5-transparent cover plate; 6-third encapsulation film; 7-transparent back plate;

[0032] 20 - power conversion device; 201 - voltage adapter unit; 2011 - second positive terminal; 2012 - second negative terminal; 2013 - fourth positive terminal;

[0033] 2014- fourth negative terminal; 202- electric energy conversion unit; 2021- fifth positive terminal; 2022- fifth negative terminal. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. However, the example embodiments can be implemented in various forms and should not be understood as being limited to the embodiments described herein. The same figure marks in the figures represent the same or similar structures, and thus their repeated descriptions will be omitted. The words expressing position and direction described in the embodiments of the present invention are all explained using the accompanying drawings as examples, but changes can be made as needed, and the changes made are all included in the scope of protection of the present invention. The drawings of the embodiments of the present invention are only used to illustrate the relative position relationship, and they do not represent the true proportions.

[0035] It should be noted that the following description sets forth specific details to facilitate understanding of the present invention. However, the present invention can be implemented in a variety of other ways than those described herein, and those skilled in the art may make similar generalizations without violating the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0036] In order to facilitate the understanding of the photovoltaic power generation system provided by the embodiment of the present invention, the application scenario of the photovoltaic power generation system is first explained below. As a renewable clean energy, light energy, photovoltaic power generation technology has been widely studied, and the photovoltaic power generation industry has developed rapidly in recent years. Figure 1 , Figure 1A structural block diagram of a photovoltaic power generation system 1000 provided in an embodiment of the present invention. Generally, the photovoltaic power generation system 1000 may include multiple components, such as a photovoltaic string 100, a DC converter 200, and an inverter 300. The photovoltaic modules 10 within the photovoltaic string 100 are capable of photoelectric conversion, thereby converting sunlight energy into DC electrical energy. The DC converter 200 can obtain electrical energy from the photovoltaic modules 10 and output the obtained electrical energy after voltage conversion. The inverter 300 can receive the electrical energy output by the DC converter 200, convert the DC electrical energy output by the DC converter 200 into AC electrical energy, and output the electrical energy to the power grid 3000 via the grid-connected transformer 2000, thereby achieving grid connection of the photovoltaic power generation system 1000; alternatively, the AC power output by the inverter 300 can be output to the load 4000 to power the load 4000.

[0037] As the core component of photovoltaic power generation system 1000, photovoltaic module 10's photoelectric conversion efficiency is a key factor affecting the power generation capacity of photovoltaic power generation system 1000. Photovoltaic cells are the basic photoelectric conversion units in photovoltaic modules. Currently, commonly used photovoltaic cells include crystalline silicon cells. However, the photoelectric conversion efficiency of mass-produced crystalline silicon cells has reached its limit. Therefore, the research and development of new materials and new structures for photovoltaic cells has become a necessary step to improve the photoelectric conversion efficiency of photovoltaic cells.

[0038] Because perovskite cells have a higher theoretical upper limit for photoelectric conversion efficiency, and with the rapid development of perovskite cell technology, the photoelectric conversion efficiency of perovskite cells in laboratories is now approaching that of crystalline silicon cells. Therefore, the field has proposed photovoltaic modules that stack perovskite cells with crystalline silicon cells. This can reuse existing crystalline silicon cell production lines while also increasing the efficiency of photovoltaic modules. This is expected to further improve the efficiency and reduce the cost of photovoltaic modules, and is therefore an important development direction for the next generation of high-efficiency photovoltaic modules.

[0039] Currently, there are two main designs for stacked photovoltaic modules combining perovskite cells and crystalline silicon cells: one is a series-connected stack, and the other is a parallel-connected stack. The series-connected stack integrates the perovskite cells directly by coating them on the crystalline silicon cells, which presents challenges in the velvet coating process during its preparation. Furthermore, the series-connected stack requires current matching between the perovskite cells and the crystalline silicon cells, which places high demands on the bandgap width of the perovskite cells. It is also likely to be affected by environmental factors such as temperature or spectral changes, leading to current mismatch problems. Furthermore, the stability of wide-bandgap perovskites is a commercial challenge.

[0040] Parallel two-terminal stacking is the integration of crystalline silicon cells and perovskite cells, which requires voltage matching. Although perovskite cells can be decoupled from crystalline silicon cells during the preparation process to make all crystalline silicon cell preparation routes applicable, it also faces the challenge of efficiently preparing large-area perovskite cells. In addition, if the crystalline silicon cell is multi-sliced ​​to increase the voltage of the crystalline silicon cell to adapt to the voltage of the perovskite cell, the parallel two-terminal stacked photovoltaic module will still have a high-voltage and low-current IV output characteristic, which will cause problems with its adaptation to the downstream inverter interface. If the perovskite cell is partitioned to reduce the voltage of the perovskite cell to adapt to the voltage of the crystalline silicon cell, although it can achieve a low-voltage and high-current IV output characteristic similar to that of the crystalline silicon cell photovoltaic module to adapt to the existing inverter interface, the partitioning design of the perovskite cell will increase the process complexity and also bring additional losses. In actual application, it is easily affected by environmental factors such as temperature or shading, resulting in mismatch problems.

[0041] In view of this, the photovoltaic power generation system provided by the embodiment of the present invention utilizes an electric energy conversion device to match the output voltages of the wide bandgap cell components and narrow bandgap cell components in the stacked photovoltaic module, so that each wide bandgap cell component, the narrow bandgap cell component, and the entire stacked photovoltaic module are always in the optimal operating state, and can avoid the losses caused by the modification of the wide bandgap cell components and the narrow bandgap cell components as well as the mismatch losses caused by environmental factors, thereby improving the power generation efficiency of the photovoltaic power generation system. To facilitate understanding of the technical solution of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Figure 2 A schematic diagram of the structure of a laminated photovoltaic module provided by an embodiment of the present utility model. Figure 2 As shown, in the present invention, a laminated photovoltaic module 10 includes a first cell assembly 1 and a second cell assembly 2 arranged in a stacked manner, wherein one of the first cell assembly 1 and the second cell assembly 2 is a wide bandgap cell assembly, and the other of the first cell assembly 1 and the second cell assembly 2 is a narrow bandgap cell assembly. For ease of understanding, the following embodiments of the present invention are all based on the example of the first cell assembly 1 being a wide bandgap cell assembly 1 and the second cell assembly 2 being a narrow bandgap cell assembly 2 to illustrate the specific configuration of the laminated photovoltaic module 10 and the photovoltaic power generation system provided by the present invention.

[0043] You can continue to refer to Figure 2 The laminated photovoltaic module 10 further includes a first encapsulation film 3 , which is located between the wide bandgap cell module 1 and the narrow bandgap cell module 2 , and the wide bandgap cell module 1 and the narrow bandgap cell module 2 are connected via the first encapsulation film 3 .

[0044] In addition, the laminated photovoltaic module 10 further includes a second encapsulation film 4 and a transparent cover plate 5 . The second encapsulation film 4 is located between the wide bandgap cell module 1 and the transparent cover plate 5 , and the transparent cover plate 5 is connected to the wide bandgap cell module 1 through the second encapsulation film 4 .

[0045] like Figure 2 As shown, the laminated photovoltaic module 10 may further include a third packaging film 6 and a transparent backsheet 7 . The third packaging film 6 is located between the narrow bandgap cell module 2 and the transparent backsheet 7 , and the transparent backsheet 7 is connected to the narrow bandgap cell module 2 through the third packaging film 6 .

[0046] In the above-mentioned laminated photovoltaic module 10 , the wide bandgap cell module 1 and the narrow bandgap cell module 2 are encapsulated between the transparent cover plate 5 and the transparent back plate 7 , which is beneficial to improving the structural strength of the laminated photovoltaic module 10 .

[0047] In the present invention, the transparent cover plate 5 and the transparent back plate 7 can both be glass plates to ensure the light transmittance of the laminated photovoltaic module 10. In addition, the thickness of the transparent cover plate 5 and the transparent back plate 7 can be adjusted to ensure the structural reliability of the laminated photovoltaic module 10 while meeting its light transmittance requirements.

[0048] In one possible embodiment, the thickness of the transparent cover plate 5 may be 1 mm to 4 mm, for example, 1.5 mm, 2 mm, 2.8 mm, or 3.2 mm. In addition, the thickness of the transparent back plate 7 may be 1 mm to 4 mm, for example, 1.5 mm, 2 mm, 2.8 mm, or 3.2 mm. These may be specifically set according to actual usage requirements.

[0049] The above embodiment is only an exemplary description of the specific setting method of the laminated photovoltaic module 10 provided by the present invention. On this basis, the structure of the laminated photovoltaic module 10 can be subjected to a series of deformations according to actual use requirements. They are not listed one by one here, but they should all be understood to fall within the scope of protection of the present invention.

[0050] As can be seen from the above description, wide bandgap cell modules 1 (such as perovskite cell modules) and narrow bandgap cell modules 2 (such as crystalline silicon cell modules) have different IV output characteristics. To avoid modifying wide bandgap cell modules 1 and narrow bandgap cell modules 2 and to ensure that wide bandgap cell modules 1 and narrow bandgap cell modules 2 are always in optimal working condition, the present invention proposes a solution for achieving voltage matching between wide bandgap cell modules 1 and narrow bandgap cell modules 2 using external power electronics.

[0051] Specifically, refer to Figure 3 , Figure 3A schematic diagram of the structure of a photovoltaic power generation module provided in an embodiment of the present invention. This photovoltaic power generation module includes, in addition to a laminated photovoltaic module 10, an electric energy conversion device 20. It is worth noting that, in the following embodiments, for ease of illustration, the structures of the laminated photovoltaic module 10 other than the wide bandgap cell module 1 and the narrow bandgap cell module 2 are omitted.

[0052] You can continue to refer to Figure 3 The power conversion device 20 includes a voltage adaptation unit 201 and a power conversion unit 202, wherein the output end of the voltage adaptation unit 201 is connected to the input end of the power conversion unit 202 to realize the cascade connection of the voltage adaptation unit 201 and the power conversion unit 202.

[0053] In addition, the output end of the wide bandgap battery assembly 1 is connected to the input end of the voltage adaptation unit 201, the output end of the narrow bandgap battery assembly 2 is connected to the output end of the voltage adaptation unit 201, and the output end of the narrow bandgap battery assembly 2 is connected to the input end of the power conversion unit 202.

[0054] It is worth mentioning that the output end of the wide band gap battery assembly 1 includes a first positive terminal 11 and a first negative terminal 12, and the input end of the voltage adaptation unit 201 includes a second positive terminal 2011 and a second negative terminal 2012. The first positive terminal 11 is connected to the second positive terminal 2011, and the first negative terminal 12 is connected to the second negative terminal 2012, thereby realizing the connection between the output end of the wide band gap battery assembly 1 and the input end of the voltage adaptation unit 201.

[0055] Similarly, the output end of the narrow bandgap battery assembly 2 includes a third positive terminal 21 and a third negative terminal 22, the output end of the voltage adaptation unit 201 includes a fourth positive terminal 2013 and a fourth negative terminal 2014, and the input end of the power conversion unit 202 includes a fifth positive terminal 2021 and a fifth negative terminal 2022. The third positive terminal 21 is connected to the fourth positive terminal 2013 and the fifth positive terminal 2021, and the third negative terminal 22 is connected to the fourth negative terminal 2014 and the fifth negative terminal 2022, thereby achieving a connection between the output end of the narrow bandgap battery assembly 2 and the output end of the voltage adaptation unit 201, and a connection between the output end of the narrow bandgap battery assembly 2 and the input end of the power conversion unit 202.

[0056] In addition, the fourth positive terminal 2013 is connected to the fifth positive terminal 2021 , and the fourth negative terminal 2014 is connected to the fifth negative terminal 2022 , so as to realize the connection between the output terminal of the voltage adaptation unit 201 and the input terminal of the power conversion unit 202 .

[0057] In this utility model Figure 3In the illustrated embodiment, the voltage adaption unit 201 can be used to adjust the output voltage of the output terminal of the wide bandgap cell assembly 1, and the power conversion unit 202 can be used to adjust the output voltage of the output terminal of the narrow bandgap cell assembly 2. Thus, the solution provided by the present invention can achieve matching and adjustment of the output voltages of the wide bandgap cell assembly 1 and the narrow bandgap cell assembly 2 without modifying the wide bandgap cell assembly 1 and the narrow bandgap cell assembly 2, which is beneficial for improving the system adaptability of the laminated photovoltaic module 10.

[0058] The present invention does not limit the specific configuration form of the voltage adaptation unit 201 , and examples thereof may include a Buck circuit, a Boost circuit, or a Buck-Boost circuit.

[0059] In this embodiment of the present invention, the voltage adaptor 201 is further configured to adjust the port voltage of the wide bandgap cell assembly 1 to the voltage corresponding to the maximum power value of the wide bandgap cell assembly 1 during operation. This allows the wide bandgap cell assembly 1 to always operate at its optimal state, which helps improve the photoelectric conversion efficiency of the wide bandgap cell assembly 1, thereby improving the power generation efficiency of the entire laminated photovoltaic module 10.

[0060] In addition, the power conversion unit 202 is used to adjust the port voltage of the narrow bandgap cell assembly 2 to the voltage corresponding to the maximum power value of the narrow bandgap cell assembly 2 during operation. This allows the narrow bandgap cell assembly 2 or the entire laminated photovoltaic assembly 10 to operate in an optimal state, which is conducive to improving the photoelectric conversion efficiency of the narrow bandgap cell assembly 2, thereby improving the power generation efficiency of the entire laminated photovoltaic assembly 10.

[0061] And because Figure 3 As shown, the output end of the narrow-bandgap battery assembly 2 is connected to the input end of the power conversion unit 202, and the output end of the wide-bandgap battery assembly 1 is connected to the input end of the power conversion unit 202 via the voltage adapter unit 201. The power conversion unit 202 can adjust the port voltage of the narrow-bandgap battery assembly 2 while also adjusting the port power, voltage, or current of the power conversion unit according to the needs of the specific application scenario. For example, the power conversion unit 202 can be a DC to AC conversion unit. In a possible embodiment of the present invention, the power conversion device 20 can be regarded as a micro-inverter. The power conversion unit 202 is also used to convert the DC power converted by the laminated photovoltaic assembly 10 into AC power output. The AC power output by the photovoltaic power generation module can be directly connected to the grid or provided to the load, which is conducive to the system simplification of the photovoltaic power generation system.

[0062] In addition, the power conversion unit 202 can also be a DC to DC conversion unit. In this embodiment, the power conversion device 20 can be considered an optimizer. The power conversion unit 202 can also be used to convert the voltage and current of the DC power converted by the laminated photovoltaic module 10 and output it. Therefore, when the photovoltaic power generation module is used in a photovoltaic power generation system, the output end of the power conversion device 20 can be connected to the input end of an inverter, so that the inverter converts the DC power output of the photovoltaic power generation module into AC power and then transmits it to the power grid or provides it to a load. In addition, when the photovoltaic power generation system includes multiple photovoltaic power generation modules, the output ends of the power conversion devices 20 of the multiple photovoltaic power generation modules can be connected in series and then connected to the input end of the inverter. This can help increase the power generation of the photovoltaic power generation system and enable the inverter to convert the DC power output of the power conversion devices 20 of the multiple photovoltaic power generation modules into AC power and then transmit it to the power grid or provide it to a load.

[0063] Thus, it can be seen that the design scheme of the photovoltaic power generation module provided by the present invention can achieve matching adjustment of the output voltage of the wide bandgap battery assembly 1 and the output voltage of the narrow bandgap battery assembly 2 through the power conversion device 20 without modifying the wide bandgap battery assembly 1 and the narrow bandgap battery assembly 2, and can also always adjust the port voltage of the wide bandgap battery assembly 1, the port voltage of the narrow bandgap battery assembly 2, and the port voltage of the entire laminated photovoltaic assembly 10 to the voltage under the optimal operating state, so that the entire photovoltaic power generation module always operates in the optimal state. This can effectively solve the mismatch problem between the laminated photovoltaic assembly 10 and downstream inverters and other equipment of the photovoltaic power generation system, thereby improving the adaptability of the laminated photovoltaic assembly 10, and effectively avoid the losses caused by the modification of the wide bandgap battery assembly 1 and the narrow bandgap battery assembly 2, as well as the mismatch losses caused by environmental factors, which is conducive to improving the power generation efficiency of the laminated photovoltaic assembly 10, and thus improving the power generation efficiency of the entire photovoltaic power generation module.

[0064] Figure 4 Another structural diagram of the photovoltaic power generation module provided by the embodiment of the present utility model. Figure 3 The difference between the photovoltaic power generation module shown is that Figure 4 In the figure, the output end of the narrow bandgap battery assembly 2 is connected to the input end of the voltage adaptation unit 201, and the output end of the wide bandgap battery assembly 1 is connected to the output end of the voltage adaptation unit 201 and the input end of the power conversion unit 202. Figure 4In the illustrated embodiment, the voltage adaption unit 201 can be used to adjust the port voltage of the narrow bandgap cell assembly 2 to a voltage corresponding to the maximum power value of the narrow bandgap cell assembly 2 during operation, thereby ensuring that the narrow bandgap cell assembly 2 always operates in an optimal state. Furthermore, the power conversion unit 202 can be used to adjust the port voltage of the wide bandgap cell assembly 1 to a voltage corresponding to the maximum power value of the wide bandgap cell assembly 1 during operation, thereby ensuring that the wide bandgap cell assembly 1 and the laminated photovoltaic module 10 always operate in an optimal state.

[0065] It is understandable that photovoltaic power generation modules use Figure 4 The design scheme shown can still meet the matching requirements with the downstream equipment of the photovoltaic power generation system while ensuring that the wide bandgap battery assembly 1, the narrow bandgap battery assembly 2 and the entire stacked photovoltaic assembly 10 always operate at the optimal power state, thereby improving the power generation efficiency of the stacked photovoltaic assembly 10 and further improving the power generation efficiency of the entire photovoltaic power generation module.

[0066] It is worth mentioning that in Figure 4 In the photovoltaic power generation module shown, the power conversion unit 202 can be either a DC to DC conversion unit or a DC to AC conversion unit. The specific configuration can be made with reference to the above embodiment and will not be described in detail here.

[0067] Figure 4 The other parts of the photovoltaic power generation module shown can refer to Figure 3 The photovoltaic power generation module shown is set up and will not be described in detail here.

[0068] In the photovoltaic power generation module described in the above embodiment, each power conversion device 20 is used to connect to a laminated photovoltaic module 10 to adjust the operating state of the laminated photovoltaic module 10. Considering that the laminated photovoltaic module 10 includes a junction box ( Figure 4 (not shown), and the electrode terminals of each battery module in the laminated photovoltaic module 10 are connected to the junction box. In one possible embodiment of the present invention, the power conversion device 20 can be placed in the junction box, so that the power conversion device 20 and the laminated photovoltaic module 10 are connected within the junction box. This can achieve an integrated design of the power conversion device 20 and the laminated photovoltaic module 10, which facilitates on-site assembly of the photovoltaic power generation module and improves its assembly efficiency.

[0069] In some other embodiments of the present invention, the operating states of the plurality of laminated photovoltaic modules 10 may be adjusted by an electric energy conversion device 20 .

[0070] When implementing it, refer to Figure 5 , Figure 5Another schematic diagram of the structure of a photovoltaic power generation module provided in an embodiment of the present invention. The photovoltaic power generation module includes two laminated photovoltaic modules. For ease of description, the two laminated photovoltaic modules can be defined as a first laminated photovoltaic module 10a and a second laminated photovoltaic module 10b. In this embodiment, the wide bandgap cell assembly 1 in the first laminated photovoltaic module 10a and the wide bandgap cell assembly 1 in the second laminated photovoltaic module 10b are connected in series. In other words, the first negative terminal 12 of the wide bandgap cell assembly 1 in the first laminated photovoltaic module 10a is connected to the first positive terminal 11 of the wide bandgap cell assembly 1 in the second laminated photovoltaic module 10b.

[0071] In addition, if Figure 5 As shown, the output ends of the wide bandgap battery assemblies 1 in the two stacked photovoltaic modules are connected in series to the input end of the voltage adaptation unit 201, that is, the first positive terminal 11 of the wide bandgap battery assembly 1 in the first stacked photovoltaic module 10a is connected to the second positive terminal 2011 of the voltage adaptation unit 201, and the first negative terminal 12 of the wide bandgap battery assembly 1 in the second stacked photovoltaic module 10b is connected to the second negative terminal 2012 of the voltage adaptation unit 201.

[0072] You can continue to refer to Figure 5 The output end of the narrow bandgap cell assembly 2 in the first laminated photovoltaic module 10a and the narrow bandgap cell assembly 2 in the second laminated photovoltaic module 10b, after being connected in series, is connected to the output end of the voltage adaptation unit 201 and to the input end of the power conversion unit 202. In other words, the third negative terminal 22 of the narrow bandgap cell assembly 2 in the first laminated photovoltaic module 10a is connected to the third positive terminal 21 of the narrow bandgap cell assembly 2 in the second laminated photovoltaic module 10b. In addition, the third positive terminal 21 of the narrow bandgap cell assembly 2 in the first laminated photovoltaic module 10a is connected to the fourth positive terminal 2013 of the voltage adaptation unit 201 and the fifth positive terminal 2021 of the power conversion unit 202, and the third negative terminal 22 of the narrow bandgap cell assembly 2 in the second laminated photovoltaic module 10b is connected to the fourth negative terminal 2014 of the voltage adaptation unit 201 and the fifth negative terminal 2022 of the power conversion unit 202.

[0073] exist Figure 5In the illustrated embodiment, the wide bandgap cell assemblies 1 in two stacked photovoltaic modules are connected in series to form a wide bandgap cell string, and the narrow bandgap cell assemblies 2 in two stacked photovoltaic modules are connected in series to form a narrow bandgap cell string. The voltage adaptation unit 201 is used to adjust the output voltage at the output end of the bandgap cell string, and the power conversion unit 202 is used to adjust the output voltage at the output end of the narrow bandgap cell string. The design of the photovoltaic power generation module provided by the present invention can also be used to adjust multiple stacked photovoltaic modules 10 using a single power conversion device 20. This can still achieve matching adjustment of the output voltages of the wide bandgap cell string and the narrow bandgap cell string, thereby improving the system adaptability of the entire photovoltaic power generation module, thereby improving the power generation efficiency of the entire photovoltaic power generation module, and ultimately improving the power generation efficiency of the entire photovoltaic power generation system.

[0074] In this embodiment, the voltage adaptation unit 201 is further configured to adjust the voltage of the wide bandgap battery string to a voltage corresponding to the maximum power value of the wide bandgap battery string when operating, so that the wide bandgap battery string always operates at an optimal power state.

[0075] In addition, the power conversion unit 202 can also be used to adjust the terminal voltage of the narrow-bandgap battery string to the voltage corresponding to the maximum power value of the narrow-bandgap battery string during operation. This allows the narrow-bandgap battery string, the first stacked photovoltaic module 10a, and the second stacked photovoltaic module 10b to operate at an optimal power state.

[0076] Similar to the above embodiment in which one electric energy conversion device 20 adjusts the operating state of a single laminated photovoltaic module 10, Figure 5 In the embodiment shown, the power conversion unit 202 is also used to adjust the power, voltage or current of the output port of the entire photovoltaic power generation module (or the output port of the power conversion unit 202) as needed according to the usage requirements in the actual application scenario.

[0077] It is worth mentioning that in Figure 5 In the embodiment shown, the electric energy conversion unit 202 can be either a DC to AC conversion unit or a DC to DC conversion unit. Its role and the way of connecting with downstream equipment in the photovoltaic power generation system can be referred to as described above and will not be described in detail here.

[0078] In addition, based on the introduction to the photovoltaic power generation modules of the above-mentioned embodiments, it can be understood that when the photovoltaic power generation module includes two laminated photovoltaic modules, the output end of the wide bandgap cell module 1 in the first laminated photovoltaic module 10a and the wide bandgap cell module 1 in the second laminated photovoltaic module 10b, after being connected in series, can also be connected to the output end of the voltage adaptation unit 201 and to the input end of the power conversion unit 202; and the output end of the narrow bandgap cell modules 2 in the two laminated photovoltaic modules, after being connected in series, can be connected to the input end of the voltage adaptation unit 201. In this way, while still meeting the voltage matching requirements of the photovoltaic power generation module and the downstream equipment of the photovoltaic power generation system, it can ensure that the wide bandgap cell module 1, the narrow bandgap cell module 2, and each laminated photovoltaic module always operate at the optimal power state, thereby improving the power generation efficiency of the entire photovoltaic power generation module, and further improving the power generation efficiency of the entire power generation system.

[0079] It is understood that when the photovoltaic power generation module includes more than two laminated photovoltaic modules, the specific configuration is the same as that of the photovoltaic module. Figure 5 The photovoltaic power generation modules shown are similar and will not be described in detail here.

[0080] In addition, the above embodiments are only some exemplary descriptions of the specific setting methods of the photovoltaic power generation module provided by the present invention. On this basis, a series of variations can be made to the setting methods of the photovoltaic power generation module according to actual usage requirements. They are not listed one by one here, but they should all be understood to fall within the scope of protection of the present invention.

[0081] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A photovoltaic power generation module, characterized in that: The photovoltaic power generation module includes a laminated photovoltaic component and an electric energy conversion device, wherein: The laminated photovoltaic module comprises a first cell module and a second cell module stacked together, wherein one of the first cell module and the second cell module is a wide bandgap cell module, and the other of the first cell module and the second cell module is a narrow bandgap cell module; The electric energy conversion device includes a voltage adaptation unit and an electric energy conversion unit, wherein the output end of the voltage adaptation unit is connected to the input end of the electric energy conversion unit; The output end of the first battery assembly is connected to the input end of the voltage adaptation unit, and the voltage adaptation unit is used to adjust the output voltage of the output end of the first battery assembly; the output end of the second battery assembly is connected to the output end of the voltage adaptation unit and to the input end of the electric energy conversion unit, and the electric energy conversion power supply is used to adjust the output voltage of the output end of the second battery assembly.

2. The photovoltaic power generation module according to claim 1, wherein: The voltage adaptation unit is further configured to adjust the port voltage of the first battery assembly to a voltage corresponding to a maximum power value of the first battery assembly when the battery assembly is operating.

3. The photovoltaic power generation module according to claim 1 or 2, characterized in that: The electric energy conversion unit is used to adjust the port voltage of the second battery assembly to a voltage corresponding to the maximum power value of the second battery assembly when it is in operation.

4. The photovoltaic power generation module according to claim 1, wherein: The photovoltaic power generation module includes a laminated photovoltaic component, and the power conversion unit is a DC to AC conversion unit. The power conversion unit is also used to convert the DC power converted by the laminated photovoltaic component into AC power output.

5. The photovoltaic power generation module according to claim 1, wherein: The photovoltaic power generation module includes a laminated photovoltaic component, and the power conversion unit is a DC to DC conversion unit. The power conversion unit is also used to convert the voltage and current of the DC power converted by the laminated photovoltaic component and output them.

6. The photovoltaic power generation module according to claim 4 or 5, characterized in that: The laminated photovoltaic assembly includes a junction box, and the electric energy conversion device is arranged in the junction box.

7. The photovoltaic power generation module according to claim 1, wherein: The photovoltaic power generation module includes a plurality of the stacked photovoltaic modules, the first battery modules in the plurality of the stacked photovoltaic modules are connected in series to form a first battery string, the output end of the first battery string is connected to the input end of the voltage adaptation unit, and the voltage adaptation unit is used to adjust the output voltage of the output end of the first battery string; the second battery modules in the plurality of the stacked photovoltaic modules are connected in series to form a second battery string, the output end of the second battery string is connected to the output end of the voltage adaptation unit and to the input end of the electric energy conversion unit, and the electric energy conversion unit is used to adjust the output voltage of the output end of the second battery module.

8. The photovoltaic power generation module according to claim 7, wherein: The voltage adaptation unit is further configured to adjust the port voltage of the first battery string to a voltage corresponding to a maximum power value of the first battery string during operation.

9. The photovoltaic power generation module according to claim 7 or 8, characterized in that: The electric energy conversion unit is further configured to adjust the port voltage of the second battery string to a voltage corresponding to a maximum power value of the second battery string during operation.

10. The photovoltaic power generation module according to claim 7 or 8, characterized in that: The electric energy conversion unit is a direct current to alternating current conversion unit, and the electric energy conversion unit is further used to convert the direct current obtained by the plurality of stacked photovoltaic modules into alternating current for output.

11. The photovoltaic power generation module according to claim 7 or 8, characterized in that: The electric energy conversion unit is a DC to DC conversion unit, and the electric energy conversion unit is also used to convert the voltage and current of the DC power converted by the multiple stacked photovoltaic modules and output them.

12. A photovoltaic power generation system, characterized in that: The photovoltaic power generation system includes the photovoltaic power generation module according to any one of claims 1 to 11.

13. The photovoltaic power generation system according to claim 12, wherein: When the electric energy conversion unit is a DC to DC conversion unit, the photovoltaic power generation system further includes an inverter, and the output end of the electric energy conversion unit is connected to the input end of the inverter.

14. The photovoltaic power generation system according to claim 13, wherein: The photovoltaic power generation system includes a plurality of photovoltaic power generation modules, and the output ends of the power conversion units of the plurality of photovoltaic power generation modules are connected in series and then connected to the input end of the inverter.

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