CN220087251U - Junction box system for multi-junction photovoltaic cell assembly based on perovskite structure - Google Patents
Junction box system for multi-junction photovoltaic cell assembly based on perovskite structure Download PDFInfo
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- CN220087251U CN220087251U CN202321548025.6U CN202321548025U CN220087251U CN 220087251 U CN220087251 U CN 220087251U CN 202321548025 U CN202321548025 U CN 202321548025U CN 220087251 U CN220087251 U CN 220087251U
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- 229910021419 crystalline silicon Inorganic materials 0.000 claims abstract description 36
- 239000010409 thin film Substances 0.000 claims abstract description 28
- 239000010408 film Substances 0.000 abstract description 12
- 238000009434 installation Methods 0.000 abstract description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052710 silicon Inorganic materials 0.000 abstract description 3
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- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
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Abstract
The utility model provides a junction box system for a multi-junction photovoltaic cell assembly based on a perovskite structure, wherein the photovoltaic cell assembly comprises a perovskite film photovoltaic assembly and a crystal silicon cell assembly which are overlapped; the first photovoltaic module junction box of the perovskite thin film photovoltaic module and the second photovoltaic module junction box of the crystalline silicon battery module are arranged on the back of the module, the first junction box and the second junction box of the first photovoltaic module junction box comprise junction terminals, and the second photovoltaic module junction box comprises positive conductive terminals, negative conductive terminals and bypass diodes connected between the positive conductive terminals and the negative conductive terminals. According to the junction box system for the multi-junction photovoltaic cell assembly based on the perovskite structure, which is disclosed by the utility model, different junction box systems are arranged to form the junction box system of the assembly according to different electrical properties of the perovskite film photovoltaic assembly and the crystalline silicon cell assembly, so that the power output efficiency of the assembly is ensured, the cost is low, the arrangement is flexible, and the installation is convenient.
Description
Technical Field
The utility model belongs to the technical field of solar energy photovoltaics, and particularly relates to a junction box system for a multi-junction photovoltaic cell assembly based on a perovskite structure.
Background
In order to cope with the increasingly serious environmental pollution problem caused by the use of conventional fossil energy, the green renewable energy industry has been rapidly developed in recent years, and a solar cell power generation technology for generating power by using a photovoltaic effect is an important green energy technology. The solar cell is made of materials capable of generating photovoltaic effect, such as silicon, gallium arsenide, indium, selenium and copper, and can convert light energy into electric energy. At present, a photovoltaic module formed by combining a plurality of solar cells is used as a basic photovoltaic power generation unit to be widely applied to various photovoltaic power generation systems of buildings, or a transparent film module is used as a building curtain wall material to build an energy-saving environment-friendly building.
In the current photovoltaic power generation system, the crystalline silicon solar cell is widely applied, the conversion efficiency is continuously improved, and the production cost is continuously reduced. At present, the crystalline silicon solar cell accounts for more than 90% of the total global market amount of the solar cell, the conversion efficiency is generally over 20%, the electricity-to-electricity cost of thermal power generation is continuously reduced, and the crystalline silicon cell still occupies most of the market share in the current and the future in a quite long time due to mature production process and low manufacturing cost. The surface of the crystalline silicon battery needs to print a large number of grid lines for circuit connection and power output, which occupies the surface area of the battery piece and is one of important factors affecting the power generation efficiency of the crystalline silicon component. The conventional crystalline silicon battery has some limitations on materials and processes, for example, silicon wafers used in the crystalline silicon battery have large energy consumption and pollution during production, and the forbidden band width of the crystalline silicon is 1.12eV and is an indirect band gap; in addition, conventional crystalline silicon solar cells require high temperatures during diffusion and sintering, both at peak temperatures above 800 ℃, which exacerbates minority carrier recombination. In the thermal diffusion process, the emitter is heavily doped, and the Auger recombination is significantly affected. These all result in a limit value of the open circuit voltage of the crystalline silicon cell of around 750 mV.
In recent years, perovskite photovoltaic modules have attracted attention, which are mainly formed by printing, shaving, and drying a liquid material to form a thin film with a very thin thickness on a glass substrate, wherein the material has a relatively large electron-hole diffusion length and a light absorption coefficient far better than that of crystalline silicon. The direct band gap reaches 1.50-1.55 eV, photons with the wavelength less than 800nm can be absorbed, the absorption coefficient of the film material in the visible light part reaches 104-105 cm < -1 >, and the film has the advantages of low cost, high carrier mobility, large diffusion length, few crystal defects and the like, and the conversion efficiency of the film can greatly exceed that of crystalline silicon. Besides the advantages in conversion efficiency, the production process is simpler than that of crystalline silicon, and the materials are fewer, so that the perovskite photovoltaic module is lower in power generation cost than thermal power generation. Therefore, the perovskite photovoltaic module is likely to be the next hot spot for photovoltaic power generation. However, perovskite photovoltaic modules also have certain limitations, such as their stability at high temperatures, lifetime, etc. that are inferior to current crystalline silicon modules. Therefore, a multi-junction photovoltaic cell module based on a perovskite structure is developed, namely, the perovskite module is manufactured on a glass substrate through a printing film forming process, and the perovskite film is transparent and does not cause substantial influence on sunlight absorption of crystalline silicon, so that the crystalline silicon photovoltaic module can be stacked and packaged on the basis of the perovskite film module, and the stacked photovoltaic module is manufactured; compared with a crystalline silicon component, the perovskite component has higher open-circuit voltage which can reach about 200V, and short-circuit current is very small; the open circuit voltage of a crystalline silicon device is typically around 60V, but has a relatively high short circuit current, which can reach around 30A.
In the photovoltaic system, it is necessary to use a junction box to draw out electric energy generated by the photovoltaic module and connect the electric energy with an external load, and therefore, the photovoltaic module junction box is a key component for constructing various power generation systems by the photovoltaic module. And for the perovskite+crystalline silicon laminated assembly, when in operation, the perovskite film assembly and the crystalline silicon battery assembly are independently operated, and the electrical parameters (open-circuit voltage and short-circuit current) of the perovskite film assembly and the crystalline silicon battery assembly are greatly different, so that corresponding changes are required to be made on a junction box system for outputting the electric power of the assembly to meet the application of the novel assembly.
Disclosure of Invention
Aiming at the technical problems, the utility model provides a junction box system for a multi-junction photovoltaic cell assembly based on a perovskite structure, which is suitable for application of perovskite+crystalline silicon laminated photovoltaic assemblies.
The specific technical scheme provided by the utility model is as follows:
the junction box system for the multi-junction photovoltaic cell assembly based on the perovskite structure comprises a photovoltaic cell assembly, wherein the photovoltaic cell assembly comprises a perovskite thin film photovoltaic assembly and a crystalline silicon cell assembly arranged on the perovskite thin film photovoltaic assembly; the photovoltaic module comprises a first group of photovoltaic module junction boxes and a second group of photovoltaic module junction boxes, wherein the first group of photovoltaic module junction boxes are arranged on the back of the module and correspond to perovskite thin film photovoltaic modules, and the first group of photovoltaic module junction boxes comprise a first junction box and a second junction box; the second group of photovoltaic module junction boxes correspond to the crystalline silicon battery modules and comprise a left junction box, a middle junction box and a right junction box; the first junction box is internally provided with a first junction terminal which is respectively connected with a junction belt of the perovskite thin film photovoltaic module and a connector cable; the second junction box is internally provided with a second junction terminal which is respectively connected with a junction belt of the perovskite thin film photovoltaic module and a connector cable; the left junction box, the middle junction box and the right junction box comprise positive and negative conductive terminals and bypass diodes connected between the positive and negative conductive terminals.
Preferably, diodes are arranged in the first junction box and the second junction box of the first group of photovoltaic module junction boxes.
Still preferably, the first group of photovoltaic module junction boxes and the second group of photovoltaic module junction boxes are arranged at a distance.
Still preferably, the first set of photovoltaic module junction boxes is disposed above the module, and the second set of photovoltaic module junction boxes is disposed in the middle of the module.
Still preferably, the first set of photovoltaic module junction boxes and the second set of photovoltaic module junction boxes are disposed adjacent to each other.
Still preferably, the first group of photovoltaic module junction boxes and the second group of photovoltaic module junction boxes are arranged in the middle of the module.
Still preferably, the first junction box and the second junction box of the first group of photovoltaic module junction boxes are disposed at left and right edges or at upper edges of the module.
According to the junction box system for the multi-junction photovoltaic cell assembly based on the perovskite structure, which is disclosed by the utility model, different junction box systems are arranged to form the junction box system of the assembly according to different electrical properties of the perovskite film photovoltaic assembly and the crystalline silicon cell assembly, so that the power output efficiency of the assembly is ensured, the cost is low, the arrangement is flexible, and the installation is convenient.
Drawings
FIG. 1 is a schematic diagram of a junction box system for a perovskite structure-based multi-junction photovoltaic cell assembly according to one embodiment of the utility model;
FIG. 2 is a schematic diagram of a junction box system for a perovskite structure-based multi-junction photovoltaic cell assembly according to another embodiment of the utility model;
FIG. 3 is a schematic diagram of a junction box system for a perovskite structure based multi-junction photovoltaic cell assembly according to another embodiment of the utility model;
fig. 4 is a schematic structural diagram of a junction box system for a perovskite structure-based multi-junction photovoltaic cell assembly according to another embodiment of the utility model.
Detailed Description
For a further understanding of the objects, construction, features, and functions of the utility model, reference should be made to the following detailed description of the preferred embodiments.
In the description of the present utility model, it should be noted that the positional or positional relationship indicated by the terms such as "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc. are based on the positional or positional relationship shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
Referring to fig. 1, a junction box system for a multi-junction photovoltaic cell assembly based on a perovskite structure according to an embodiment of the present utility model includes a photovoltaic cell assembly 100, wherein the photovoltaic cell assembly 100 includes a perovskite thin film photovoltaic assembly and a crystalline silicon cell assembly disposed behind the perovskite thin film photovoltaic assembly; the first group of photovoltaic module junction boxes and the second group of photovoltaic module junction boxes are arranged on the back surface of the module 100, and the first group of photovoltaic module junction boxes correspond to perovskite thin film photovoltaic modules and comprise a first junction box 11 and a second junction box 12; the second group of photovoltaic module junction boxes correspond to the crystalline silicon battery modules and comprise a left junction box 21, a middle junction box 22 and a right junction box 23; the first junction box 11 is provided with a first junction terminal 112, and the first junction terminal 112 is respectively connected with a junction strip of the perovskite thin film photovoltaic module and a connector cable; the second junction box 12 is provided with a second junction terminal 122, and the second junction terminal 122 is respectively connected with a junction strip of the perovskite thin film photovoltaic module and a connector cable; the left junction box 21, the middle junction box 22 and the right junction box 23 comprise positive and negative conductive terminals and bypass diodes connected between the positive and negative conductive terminals.
In one embodiment, as shown in fig. 1, the first group of photovoltaic module terminal boxes and the second group of photovoltaic module terminal boxes are disposed at a distance from each other, for example, as shown in the figure, the first group of photovoltaic module terminal boxes are disposed above the modules, and the second group of photovoltaic module terminal boxes are disposed in the middle of the modules; in another embodiment of the present utility model as shown in fig. 2, the first group of photovoltaic module junction boxes and the second group of photovoltaic module junction boxes are disposed adjacently, and may be disposed in the middle of the module.
In a preferred embodiment, because the open-circuit voltage of the perovskite thin film photovoltaic module is large, the short-circuit voltage is relatively small, and the current passing through the module is even smaller than 2A, when the module is partially shielded and the hot spot effect occurs, the heating effect of the shielding part is not obvious, and a bypass diode is not needed for hot spot protection; in addition, because the perovskite thin film photovoltaic module is integrally printed and film-formed, unlike the crystalline silicon battery module which is formed by connecting the battery pieces, the perovskite thin film photovoltaic module has the characteristics of the perovskite thin film photovoltaic module, and the corresponding design is carried out on the hot spot effect of the perovskite thin film photovoltaic module at present, and no extra bypass diode is needed for hot spot protection, therefore, in the embodiment shown in fig. 1 and 2, the first junction box and the second junction box of the first group of photovoltaic modules are only provided with the junction terminals connected with the module bus belt and the connector cable, and the box body does not contain the bypass diode. For the crystalline silicon photovoltaic module, the current passing through the crystalline silicon photovoltaic module is generally about 18A or even higher, and at the moment, when the local part of the module is shielded to generate a hot spot effect, the heating effect of the shielding part is very obvious, and if the bypass diode is not used for hot spot protection, serious safety accidents can be caused, so that the junction box of the crystalline silicon photovoltaic module needs to be protected by adding the bypass diode.
In another preferred embodiment, since the bus tapes of the perovskite thin film photovoltaic modules are generally disposed at the four rims of the modules, the first and second junction boxes of the first group of photovoltaic module junction boxes are preferably disposed at the left and right edges or at the upper edge of the modules.
In another two embodiments of the present utility model shown in fig. 3 and 4, in this embodiment, for perovskite thin film photovoltaic modules with slightly higher passing current, for example, the current is above 2.5A, in order to ensure the normal operation of the thin film module, improve the working stability and prolong the service life of the thin film module, a bypass diode may be disposed in a junction box of the thin film module to protect the hot spot effect, as shown in the figure, and may also be disposed in a first junction box 11 'and a second junction box 12' of the first group of photovoltaic module junction boxes; as described above, as shown in fig. 4, the first group of photovoltaic module terminal boxes and the second group of photovoltaic module terminal boxes may be disposed at a distance from each other, for example, as shown in fig. 4, the first group of photovoltaic module terminal boxes are disposed above the module, and the second group of photovoltaic module terminal boxes are disposed in the middle of the module; in another embodiment, as shown in fig. 3, the first set of photovoltaic module junction boxes and the second set of photovoltaic module junction boxes are disposed adjacent to each other and may be disposed in the middle of the module. The user can flexibly select according to the structure of the component, the system installation and the like.
According to the junction box system for the multi-junction photovoltaic cell assembly based on the perovskite structure, different junction box systems are arranged to form the junction box system of the assembly according to different electrical properties of the perovskite thin film photovoltaic assembly and the crystalline silicon cell assembly, so that the power output efficiency of the assembly is ensured, the working stability of the assembly is improved, and the service life is prolonged; the assembly has low manufacturing cost, flexible arrangement and convenient installation.
The utility model has been described with respect to the above-described embodiments, however, the above-described embodiments are merely examples of practicing the utility model. It should be noted that the disclosed embodiments do not limit the scope of the utility model. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model.
Claims (7)
1. The junction box system for the multi-junction photovoltaic cell assembly based on the perovskite structure is characterized by comprising a photovoltaic cell assembly, wherein the photovoltaic cell assembly comprises a perovskite thin film photovoltaic assembly and a crystalline silicon cell assembly arranged on the perovskite thin film photovoltaic assembly; the photovoltaic module comprises a first group of photovoltaic module junction boxes and a second group of photovoltaic module junction boxes, wherein the first group of photovoltaic module junction boxes are arranged on the back of the module and correspond to perovskite thin film photovoltaic modules, and the first group of photovoltaic module junction boxes comprise a first junction box and a second junction box; the second group of photovoltaic module junction boxes correspond to the crystalline silicon battery modules and comprise a left junction box, a middle junction box and a right junction box; the first junction box is internally provided with a first junction terminal which is respectively connected with a junction belt of the perovskite thin film photovoltaic module and a connector cable; the second junction box is internally provided with a second junction terminal which is respectively connected with a junction belt of the perovskite thin film photovoltaic module and a connector cable; the left junction box, the middle junction box and the right junction box comprise positive and negative conductive terminals and bypass diodes connected between the positive and negative conductive terminals.
2. The junction box system for a multi-junction photovoltaic cell module based on a perovskite structure according to claim 1, wherein diodes are arranged in the first junction box and the second junction box of the first group of photovoltaic cell module junction boxes.
3. The junction box system for a multi-junction photovoltaic cell module based on a perovskite structure according to claim 1 or 2, wherein the first group of photovoltaic cell module junction boxes and the second group of photovoltaic cell module junction boxes are arranged at a distance.
4. A junction box system for a multi-junction photovoltaic cell module based on a perovskite structure according to claim 3, wherein the first group of photovoltaic module junction boxes is arranged above the module and the second group of photovoltaic module junction boxes is arranged in the middle of the module.
5. A junction box system for a multi-junction photovoltaic cell module based on a perovskite structure according to claim 1 or 2, wherein the first group of photovoltaic module junction boxes and the second group of photovoltaic module junction boxes are arranged adjacently.
6. The junction box system for a multi-junction photovoltaic cell module based on a perovskite structure according to claim 5, wherein the first group of photovoltaic module junction boxes and the second group of photovoltaic module junction boxes are arranged in the middle of the module.
7. The junction box system for a multi-junction photovoltaic cell module based on a perovskite structure according to claim 1 or 2, wherein the first junction box and the second junction box of the first group of photovoltaic cell module junction boxes are arranged at the left and right edges or at the upper edge of the module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321548025.6U CN220087251U (en) | 2023-06-16 | 2023-06-16 | Junction box system for multi-junction photovoltaic cell assembly based on perovskite structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321548025.6U CN220087251U (en) | 2023-06-16 | 2023-06-16 | Junction box system for multi-junction photovoltaic cell assembly based on perovskite structure |
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| Publication Number | Publication Date |
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| CN220087251U true CN220087251U (en) | 2023-11-24 |
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| CN202321548025.6U Active CN220087251U (en) | 2023-06-16 | 2023-06-16 | Junction box system for multi-junction photovoltaic cell assembly based on perovskite structure |
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| CN (1) | CN220087251U (en) |
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2023
- 2023-06-16 CN CN202321548025.6U patent/CN220087251U/en active Active
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