Junction box system based on perovskite photovoltaic module and photovoltaic system
By designing the junction box system of voltage conversion module and bypass module, the complex wiring problems caused by the difference in electrical parameters of perovskite and crystalline silicon photovoltaic modules are solved, and cost reduction, wiring simplification and system integration are achieved.
Patent Information
- Application Number
- CN202411488697.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-24
- Publication Date
- 2024-12-10
AI Technical Summary
The difference in electrical parameters of existing perovskite and crystalline silicon photovoltaic modules leads to complex wiring, increasing material and installation costs, and increasing wiring and maintenance difficulties.
Design a junction box system to convert the output signal of perovskite photovoltaic module into target signal through voltage conversion module and bypass module, and simplify the wiring process through a highly integrated junction box, reduce the number of external cables, and protect the battery. The string is not affected by the heat spot effect.
Reduces installation cost and wiring difficulty, simplifies the wiring system of perovskite photovoltaic modules, makes it clean and beautiful, reduces the impact on the power and power generation of perovskite photovoltaic modules, and improves the integration and maintenance convenience of the system. .
Smart Images
Figure CN119109414A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the field of solar photovoltaic technology, and in particular to a junction box system and a photovoltaic system based on a perovskite photovoltaic module. Background Art
[0002] The photovoltaic junction box is installed on the front or back of the photovoltaic module to connect the photovoltaic module and the external circuit, and conduct the current generated by the photovoltaic module to the external circuit. For the crystalline silicon / perovskite four-terminal stacked photovoltaic module, the perovskite cell and the crystalline silicon cell are respectively arranged on the opposite sides of the glass substrate. The perovskite cell and the crystalline silicon cell work independently, and the electrical parameters (current and voltage) of the perovskite cell and the crystalline silicon cell are quite different; the conventional solution is to use two sets of junction boxes to output the electricity generated by the perovskite cell and the crystalline silicon cell respectively, which requires the use of more cables, which will increase the system material cost and installation cost. In addition, one photovoltaic module outputs two positive poles and two negative poles, which increases the difficulty of wiring and maintenance. Summary of the invention
[0003] Based on this, it is necessary to provide a junction box system and photovoltaic system based on perovskite photovoltaic modules to reduce installation costs, simplify wiring difficulty, and eliminate the impact of electrical parameter differences on wiring.
[0004] A junction box system based on a perovskite photovoltaic module, wherein the perovskite photovoltaic module includes a first preset battery string; the junction box system includes:
[0005] A first junction box, having a first connection end, a second connection end, a third connection end and a fourth connection end, wherein the first connection end is connected to the positive electrode of the first preset battery string, the second connection end is connected to the negative electrode of the first preset battery string, the third connection end serves as the positive terminal of the first preset battery string, and the fourth connection end serves as the negative terminal of the first preset battery string; the first junction box comprises:
[0006] a first bypass module, wherein a positive electrode of the first bypass module is connected to the third connection end, and a negative electrode of the first bypass module is connected to the fourth connection end;
[0007] A voltage conversion module, wherein the positive input terminal of the voltage conversion module is connected to the first connection terminal, and the negative input terminal of the voltage conversion module is connected to the second connection terminal; the positive output terminal of the voltage conversion module is connected to the fourth connection terminal, and the negative output terminal of the voltage conversion module is connected to the third connection terminal; the voltage conversion module is used to convert the output signal of the first preset battery string to obtain a target signal, and the third connection terminal and the fourth connection terminal are used to lead out the target signal.
[0008] In one embodiment, the perovskite photovoltaic module further includes a second preset battery string; the junction box system further includes:
[0009] The second junction box is spaced apart from the first junction box, and has a first battery connection end for connecting to the positive electrode of the second preset battery string, and a second battery connection end for connecting to the negative electrode of the second preset battery string, the first battery connection end serves as the positive terminal of the second preset battery string, and the second battery connection end serves as the negative terminal of the second preset battery string; the second junction box includes:
[0010] A second bypass module, wherein a negative electrode of the second bypass module is connected to the first battery connection end, and a positive electrode of the second bypass module is connected to the second battery connection end.
[0011] In one embodiment, the first preset battery string and the second preset battery string are different types of battery strings, the perovskite photovoltaic module includes a plurality of the first preset battery strings arranged at intervals and a plurality of the second preset battery strings connected in series; the junction box system includes a plurality of the first junction boxes and a plurality of the second junction boxes; a plurality of the first preset battery strings and a plurality of the first junction boxes are respectively connected correspondingly, and a plurality of the second preset battery strings and a plurality of the second junction boxes are respectively connected correspondingly;
[0012] Among the multiple first junction boxes, the fourth connection end of the first junction box located in the middle is connected to the third connection end of the adjacent previous first junction box, and the third connection end of the first junction box located in the middle is connected to the fourth connection end of the adjacent next first junction box.
[0013] In one embodiment, among the multiple first junction boxes and the multiple second junction boxes, the fourth connection end of the first junction box at the head end is connected to the first battery connection end of the second junction box at the head end, serving as the positive terminal of the perovskite photovoltaic module; the third connection end of the first junction box at the tail end is connected to the second battery connection end of the second junction box at the tail end, serving as the negative terminal of the perovskite photovoltaic module.
[0014] In one embodiment, among the multiple first junction boxes and the multiple second junction boxes, the first battery connection end of the second junction box at the head end serves as the positive terminal of the perovskite photovoltaic module, the second battery connection end of the second junction box at the tail end is connected to the fourth connection end of the first junction box at the head end, and the third connection end of the first junction box at the tail end serves as the negative terminal of the perovskite photovoltaic module.
[0015] In one of the embodiments, the perovskite photovoltaic module further includes a second preset battery string;
[0016] The first junction box further has a fifth connection terminal and a sixth connection terminal, the fifth connection terminal is used to connect to the positive electrode of the second preset battery string, the sixth connection terminal is used to connect to the negative electrode of the second preset battery string, the fifth connection terminal serves as the positive terminal of the second preset battery string, and the sixth connection terminal serves as the negative terminal of the second preset battery string; the first junction box also includes:
[0017] A third bypass module, wherein a negative electrode of the third bypass module is connected to the fifth connection end, and a positive electrode of the third bypass module is connected to the sixth connection end.
[0018] In one embodiment, the first preset battery string and the second preset battery string are different types of battery strings, the perovskite photovoltaic module includes a plurality of the first preset battery strings arranged at intervals and a plurality of the second preset battery strings connected in series, and the junction box system includes a plurality of the first junction boxes; a plurality of the first preset battery strings and a plurality of the first junction boxes are respectively connected correspondingly, and a plurality of the second preset battery strings and a plurality of the first junction boxes are respectively connected correspondingly;
[0019] Among the multiple first junction boxes, the fourth connection end of the first junction box located in the middle is connected to the third connection end of the adjacent previous first junction box, and the third connection end of the first junction box located in the middle is connected to the fourth connection end of the adjacent next first junction box.
[0020] In one embodiment, among the multiple first junction boxes, the fifth connection terminal of the first junction box at the head end is connected to the fourth connection terminal, serving as the positive terminal of the perovskite photovoltaic module, and the sixth connection terminal of the first junction box at the tail end is connected to the third connection terminal, serving as the negative terminal of the perovskite photovoltaic module.
[0021] In one embodiment, the perovskite photovoltaic module further includes a second preset battery string; the fourth connection end is connected to the positive electrode of the second preset battery string, and the third connection end is connected to the negative electrode of the second preset battery string;
[0022] The fourth connection end also serves as the positive terminal of the second preset battery string, and the third connection end also serves as the negative terminal of the second preset battery string.
[0023] In one embodiment, the first preset battery string and the second preset battery string are different types of battery strings, the perovskite photovoltaic module includes a plurality of the first preset battery strings arranged at intervals and a plurality of the second preset battery strings connected in series, and the junction box system includes a plurality of the first junction boxes; a plurality of the first preset battery strings and a plurality of the first junction boxes are respectively connected correspondingly, and a plurality of the second preset battery strings and a plurality of the first junction boxes are respectively connected correspondingly;
[0024] Among them, among the multiple first junction boxes, the fourth connection end of the first junction box at the head end serves as the positive terminal of the perovskite photovoltaic module, and the third connection end of the first junction box at the tail end serves as the negative terminal of the perovskite photovoltaic module; the fourth connection end of the first junction box located in the middle is connected to the third connection end of the adjacent previous first junction box, and the third connection end of the first junction box located in the middle is connected to the fourth connection end of the adjacent next first junction box.
[0025] In one embodiment, the perovskite photovoltaic module further includes a second preset battery string; the first junction box further has a seventh connection terminal, the seventh connection terminal is connected to the positive electrode of the second preset battery string, and the fourth connection terminal is connected to the negative electrode of the second preset battery string; the first junction box also includes:
[0026] a fourth bypass module, wherein a negative electrode of the fourth bypass module is connected to the seventh connection end, and a positive electrode of the fourth bypass module is connected to the fourth connection end;
[0027] The seventh connection terminal serves as the positive terminal of the second preset battery string, and the fourth connection terminal also serves as the negative terminal of the second preset battery string.
[0028] In one embodiment, the first preset battery string and the second preset battery string are different types of battery strings, the perovskite photovoltaic module includes a plurality of the first preset battery strings arranged at intervals and a plurality of the second preset battery strings arranged at intervals; the junction box system includes a plurality of the first junction boxes;
[0029] Among them, among the multiple first junction boxes, the seventh connection end of the first junction box at the head end serves as the positive terminal of the perovskite photovoltaic module, and the third connection end of the first junction box at the tail end serves as the negative terminal of the perovskite photovoltaic module; the seventh connection end of the first junction box located in the middle is connected to the third connection end of the adjacent previous first junction box, and the third connection end of the first junction box located in the middle is connected to the seventh connection end of the adjacent next first junction box.
[0030] A photovoltaic system, comprising:
[0031] A perovskite photovoltaic module, comprising a first predetermined cell string; and
[0032] A junction box system as described in any one of the above items.
[0033] In one embodiment, the first preset cell string includes one of a perovskite cell string and a crystalline silicon cell string; or the perovskite photovoltaic module includes a first preset cell string and a second preset cell string stacked and spaced apart, one of the first preset cell string and the second preset cell string is a perovskite cell string, and the other is a crystalline silicon cell string.
[0034] In the above-mentioned junction box system based on perovskite photovoltaic modules, after the voltage conversion module of the first junction box converts the output signal of the first preset battery string into a target signal, it is led out through the third connection terminal and the fourth connection terminal of the first junction box, and the first bypass module of the first junction box can protect the first preset battery string from the influence of the hot spot effect, which simplifies the wiring system of the perovskite photovoltaic module, reduces the number of external cables, facilitates the connection and installation between the perovskite photovoltaic module and the junction box system, and simplifies subsequent maintenance, making the wiring system neat and beautiful, and reducing costs. The first junction box has a high degree of integration and a small shading area, which reduces the influence of the connection of the junction box system on the power and power generation of the perovskite photovoltaic module.
[0035] In the above photovoltaic system, after the voltage conversion module of the first junction box in the junction box system converts the output signal of the first preset battery string into a target signal, it is led out through the third connection terminal and the fourth connection terminal of the first junction box, and the first bypass module of the first junction box can protect the first preset battery string from the influence of the hot spot effect, simplifying the wiring system of the perovskite photovoltaic module, reducing the number of external cables, facilitating the connection and installation between the perovskite photovoltaic module and the junction box system, simplifying subsequent maintenance, making the wiring system neat and beautiful, and reducing costs. The first junction box has a high degree of integration and a small shading area, which reduces the influence of the connection of the junction box system on the power and power generation of the perovskite photovoltaic module, and increases the power provided by the photovoltaic system to the load. BRIEF DESCRIPTION OF THE DRAWINGS
[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0037] Figure 1 A schematic diagram of circuit connection of a junction box system in some embodiments;
[0038] Figure 2 for Figure 1 A schematic diagram of the structure of a junction box system in some corresponding embodiments;
[0039] Figure 3Schematic diagram of circuit connection of junction box system in other embodiments;
[0040] Figure 4 for Figure 3 A schematic diagram of the structure of a junction box system in some corresponding embodiments;
[0041] Figure 5 Schematic diagram of circuit connection of junction box system in some other embodiments;
[0042] Figure 6 for Figure 5 A schematic diagram of the structure of a junction box system in some corresponding embodiments;
[0043] Figure 7 A schematic diagram of circuit connection of a junction box system in some further embodiments;
[0044] Figure 8 for Figure 7 A schematic diagram of the structure of a junction box system in some corresponding embodiments;
[0045] Fig. 9 Schematic diagram of circuit connection of junction box system in some other embodiments;
[0046] Fig.10 for Fig. 9 A schematic diagram of the structure of a junction box system in some corresponding embodiments;
[0047] Fig.11 Schematic diagram of circuit connection of junction box system in some other embodiments;
[0048] Fig.12 for Fig.11 A schematic diagram of the structure of a junction box system in some corresponding embodiments;
[0049] Fig.13 A schematic diagram of circuit connection of a junction box system in some further embodiments;
[0050] Fig.14 for Fig.13 A schematic diagram of the structure of a junction box system in some corresponding embodiments;
[0051] Fig.15 A schematic diagram of circuit connection of a junction box system in some further embodiments;
[0052] Fig.16 for Fig.15 A schematic diagram of the structure of a junction box system in some corresponding embodiments;
[0053] Fig.17 Schematic diagram of circuit connection of junction box system in other embodiments;
[0054] Fig.18 for Fig.17 A schematic diagram of the structure of a junction box system in some corresponding embodiments;
[0055] Fig.19 Schematic diagram of circuit connection of junction box system in other embodiments;
[0056] Fig. 20 for Fig.19 Schematic diagram of the structure of the junction box system in some corresponding embodiments.
[0057] Description of reference numerals:
[0058] Positive input terminal 1, negative input terminal 2, positive output terminal 3, negative output terminal 4, negative electrode 5, positive electrode 6, first preset battery string 102, second preset battery string 104, first junction box 202, second junction box 204, first connection terminal 302, second connection terminal 304, third connection terminal 306, fourth connection terminal 308, first battery connection terminal 310, second battery connection terminal 312, fifth connection terminal 314, sixth connection terminal 316, seventh connection terminal 318, first bypass module 402, voltage conversion module 404, second bypass module 406, third bypass module 408, fourth bypass module 410. DETAILED DESCRIPTION
[0059] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.
[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.
[0061] It is understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of this application, a first junction box may be referred to as a second junction box, and similarly, a second junction box may be referred to as a first junction box. Both the first junction box and the second junction box are junction boxes, but they are not the same junction box.
[0062] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.
[0063] It can be understood that “at least one” means one or more, “plurality” means two or more, and “at least a portion of an element” means a part or all of an element.
[0064] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" and the like specify the presence of stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in this specification includes any and all combinations of the relevant listed items.
[0065] Figure 1 is a circuit connection diagram of a junction box system in some embodiments, Figure 2 for Figure 1 The structural diagram of the junction box system in some corresponding embodiments is as follows: Figure 1 , Figure 2 As shown, in this embodiment, a junction box system based on a perovskite photovoltaic module is provided, which is applied to a perovskite photovoltaic module including a perovskite battery string, wherein the perovskite photovoltaic module includes a first preset battery string 102; the junction box system includes: a first junction box 202; the first junction box 202 has a first connection terminal 302, a second connection terminal 304, a third connection terminal 306 and a fourth connection terminal 308, the first connection terminal 302 is connected to the positive electrode of the first preset battery string 102, the second connection terminal 304 is connected to the negative electrode of the first preset battery string 102, the third connection terminal 306 serves as the positive terminal of the first preset battery string 102, and the fourth connection terminal 308 serves as the negative terminal of the first preset battery string 102.
[0066] The first junction box 202 includes: a first bypass module 402 and a voltage conversion module 404; the positive pole 6 of the first bypass module 402 is connected to the third connection terminal 306, and the negative pole 5 of the first bypass module 402 is connected to the fourth connection terminal 308; the positive input terminal 1 of the voltage conversion module 404 is connected to the first connection terminal 302, and the negative input terminal 2 of the voltage conversion module 404 is connected to the second connection terminal 304; the positive output terminal 3 of the voltage conversion module 404 is connected to the fourth connection terminal 308, and the negative output terminal 4 of the voltage conversion module 404 is connected to the third connection terminal 306; the voltage conversion module 404 is used to convert the output signal of the first preset battery string 102 to obtain a target signal, and the third connection terminal 306 and the fourth connection terminal 308 are used to lead out the target signal.
[0067] The positive terminal of battery string A is the positive electrode of battery string A connected to the outside, the negative terminal of battery string A is the negative electrode of battery string A connected to the outside, and the bus bars at both ends of battery string A are the positive electrode and negative electrode of battery string A respectively.
[0068] The output signal of the first preset battery string includes the actual output voltage of the first preset battery string and the actual output current of the first preset battery string, and the target signal includes the target voltage and the target current, and the target signal is the preset signal that the first preset battery string needs to output. The third connection terminal 306 and the fourth connection terminal 308 of the first junction box 202 are respectively connected to other junction boxes or respectively connected to loads to output the target current and target voltage. The output signal of the first preset battery string is converted into a target signal word by the first junction box 202 and then output, which can avoid the problem that the output signal of the first preset battery string does not match the signal of other junction boxes or loads.
[0069] The first bypass module 402 includes one or more diode chips, the anode of the diode chip is the positive electrode 6 of the first bypass module 402, and the cathode of the diode chip is the negative electrode 5 of the first bypass module 402; the diode chip includes a Schottky planar chip, a Schottky trench chip or a metal oxide semiconductor field effect transistor chip, and the packaging method of the first bypass module 402 includes axial packaging, surface mount packaging or module packaging.
[0070] In the above-mentioned junction box system based on perovskite photovoltaic modules, the first bypass module 402 of the first junction box 202 can protect the first preset battery string 102 from being affected by the hot spot effect. At the same time, the voltage conversion module 404 of the first junction box 202 converts the output signal of the first preset battery string 102 into a target signal, and then leads it out through the third connection terminal 306 and the fourth connection terminal 308 of the first junction box 202, which simplifies the wiring system of the perovskite photovoltaic module, reduces the number of external cables, facilitates the connection and installation between the perovskite photovoltaic module and the junction box system, and makes subsequent maintenance simple, making the wiring system neat and beautiful, and reducing costs. The first junction box 202 has a high degree of integration and a small shading area, which reduces the impact of the connection of the junction box system on the power and power generation of the perovskite photovoltaic module.
[0071] In one embodiment, the perovskite photovoltaic module includes a first preset battery string 102, and the junction box system includes a first junction box 202. At this time, the fourth connection terminal 308 of the first junction box 202 serves as the positive terminal of the perovskite photovoltaic module, and the third connection terminal 306 of the first junction box 202 serves as the negative terminal of the perovskite photovoltaic module to provide electrical energy to the cover.
[0072] In one embodiment, the perovskite photovoltaic module includes a plurality of first preset battery strings 102, the junction box system includes a plurality of first junction boxes 202, the plurality of first preset battery strings 102 and the plurality of first junction boxes 202 are respectively connected correspondingly, and the number of the first preset battery strings 102 and the number of the first junction boxes 202 are the same; wherein, among the plurality of first junction boxes 202, the fourth connection terminal 308 of the first junction box 202 at the head end serves as the positive terminal of the perovskite photovoltaic module, and the fourth connection terminal 308 of the first junction box 202 located in the middle is connected to the adjacent previous first junction box 202. The third connection terminal 306 of the junction box 202 is connected, the third connection terminal 306 of the first junction box 202 located in the middle is connected to the fourth connection terminal 308 of the adjacent rear first junction box 202, and the third connection terminal 306 of the tail first junction box 202 is used as the negative terminal of the perovskite photovoltaic module, and the output signals of the multiple first preset battery strings 102 are converted into target signals through the multiple first junction boxes 202, and the target signals corresponding to the multiple first preset battery strings 102 are connected in series and transmitted to the load through the positive terminal and negative terminal of the perovskite photovoltaic module. Further, the multiple first preset battery strings 102 are battery strings of the same type, for example, the first preset battery string 102 is a perovskite battery string or a crystalline silicon battery string.
[0073] It can be understood that the multiple first junction boxes 202 are arranged in sequence, the head first junction box 202 is the first first junction box 202, and the tail first junction box 202 is the last first junction box 202, and different connection ends of the first junction boxes 202 are connected by cables.
[0074] Figure 3 Schematic diagram of circuit connection of junction box system in other embodiments. Figure 4 for Figure 3 The structural diagram of the junction box system in some corresponding embodiments is as follows: Figure 3 , Figure 4 As shown, in one embodiment, the perovskite photovoltaic module also includes a second preset battery string 104; the junction box system also includes: a second junction box 204, the second junction box 204 is spaced apart from the first junction box 202, the second junction box 204 has a first battery connection terminal 310 and a second battery connection terminal 312, the first battery connection terminal 310 is connected to the positive electrode of the second preset battery string 104, the second battery connection terminal 312 is connected to the negative electrode of the second preset battery string 104, the first battery connection terminal 310 serves as the positive terminal of the second preset battery string 104, and the second battery connection terminal 312 serves as the negative terminal of the second preset battery string 104.
[0075] The second junction box 204 includes: a second bypass module 406, a negative electrode 7 of the second bypass module 406 is connected to the first battery connection terminal 310, and a positive electrode 8 of the second bypass module 406 is connected to the second battery connection terminal 312. The first battery connection terminal 310 and the second battery connection terminal 312 are used to lead out the output signal of the second preset battery string 104. The second bypass module 406 in the second junction box 204 can protect the second preset battery string 104 from being affected by the hot spot effect. The first battery connection terminal 310 and the second battery connection terminal 312 of the second junction box 204 are respectively connected to other junction boxes or respectively connected to loads to output the output signal of the second preset battery string 104, so as to realize the connection between the second preset battery string 104 and the external circuit.
[0076] The preset battery string B includes one battery string formed by a plurality of single batteries connected in series, or the preset battery string B includes a plurality of battery sub-strings formed by a plurality of single batteries connected in series, and the plurality of battery sub-strings are connected in parallel to form the preset battery string B.
[0077] In some embodiments, the output signals of the first preset battery string 102 and the second preset battery string 104 are different, and the first preset battery string 102 and the second preset battery string 104 are the same type of battery strings, the first junction box 202 converts the output signal of the first preset battery string 102 into a target signal that matches the output signal of the second preset battery string 104, and outputs it through the third connection terminal 306 and the fourth connection terminal 308, and the second junction box 204 outputs the output signal of the second preset battery string 104 through the first battery connection terminal 310 and the second battery connection terminal 312. Exemplarily, the first preset battery string 102 and the second preset battery string 104 are both perovskite battery strings or crystalline silicon battery strings, wherein the perovskite battery string includes a plurality of perovskite batteries connected in series, and the crystalline silicon battery string includes a plurality of crystalline silicon batteries connected in series.
[0078] In one embodiment, the first preset battery string 102 and the second preset battery string 104 are different types of battery strings, and the perovskite photovoltaic module includes a first preset battery string 102 and a second preset battery string 104. Exemplarily, the first preset battery string 102 and the second preset battery string 104 are stacked and spaced apart; wherein the fourth connection terminal 308 of the first junction box 202 is connected to the first battery connection terminal 310 of the second junction box 204, serving as the positive terminal of the perovskite photovoltaic module; the third connection terminal 306 of the first junction box 202 is connected to the second battery connection terminal 312 of the second junction box 204, serving as the negative terminal of the perovskite photovoltaic module, and the perovskite photovoltaic module can be connected to an external circuit through a positive terminal and a negative terminal, with a small number of cables, low cost, and simple maintenance.
[0079] In one embodiment, the first preset battery string 102 and the second preset battery string 104 are different types of battery strings, and the perovskite photovoltaic module includes a first preset battery string 102 and a second preset battery string 104. Exemplarily, the first preset battery string 102 and the second preset battery string 104 are stacked and spaced apart; wherein the first battery connection terminal 310 of the second junction box 204 serves as the positive terminal of the perovskite photovoltaic module, the second battery connection terminal 312 of the second junction box 204 is connected to the fourth connection terminal 308 of the first junction box 202, and the third connection terminal 306 of the first junction box 202 serves as the negative terminal of the perovskite photovoltaic module; or the fourth connection terminal 308 of the first junction box 202 serves as the positive terminal of the perovskite photovoltaic module, the third connection terminal 306 of the first junction box 202 is connected to the first battery connection terminal 310 of the second junction box 204, and the second battery connection terminal 312 of the second junction box 204 serves as the negative terminal of the perovskite photovoltaic module.
[0080] Figure 5Schematic diagram of circuit connection of junction box system in some other embodiments, Figure 6 for Figure 5 The structural diagram of the junction box system in some corresponding embodiments, Figure 7 Schematic diagram of circuit connection of junction box system in some other embodiments. Figure 8 for Figure 7 The structural diagram of the junction box system in some corresponding embodiments is as follows: Figure 5-Figure 8 As shown, in one embodiment, the first preset battery string 102 and the second preset battery string 104 are different types of battery strings, and the perovskite photovoltaic module includes a plurality of the first preset battery strings 102 arranged at intervals and a plurality of the second preset battery strings 104 connected in series; the junction box system includes a plurality of the first junction boxes 202 and a plurality of the second junction boxes 204; a plurality of the first preset battery strings 102 and a plurality of the first junction boxes 202 are respectively connected correspondingly, and a plurality of the second preset battery strings 104 and a plurality of the second junction boxes 204 are respectively connected correspondingly;
[0081] Among the plurality of first junction boxes 202, the fourth connection end 308 of the first junction box 202 located in the middle is connected to the third connection end 306 of the adjacent previous first junction box 202, and the third connection end 306 of the first junction box 202 located in the middle is connected to the fourth connection end 308 of the adjacent next first junction box 202. Further, the second preset battery strings 104 are connected by bus bars to realize the series connection between the second preset battery strings 104, and the connection ends between adjacent junction boxes are connected by cables.
[0082] like Figure 5 , Figure 6 As shown, in one embodiment, among the multiple first junction boxes 202 and the multiple second junction boxes 204, the fourth connection terminal 308 of the first junction box 202 at the head end is connected to the first battery connection terminal 310 of the second junction box 204 at the head end, serving as the positive terminal of the perovskite photovoltaic module; the third connection terminal 306 of the first junction box 202 at the tail end is connected to the second battery connection terminal 312 of the second junction box 204 at the tail end, serving as the negative terminal of the perovskite photovoltaic module.
[0083] like Figure 7 , Figure 8As shown, in one embodiment, among the multiple first junction boxes 202 and the multiple second junction boxes 204, the first battery connection terminal 310 of the second junction box 204 at the head end serves as the positive terminal of the perovskite photovoltaic module, the second battery connection terminal 312 of the second junction box 204 at the tail end is connected to the fourth connection terminal 308 of the first junction box 202 at the head end, and the third connection terminal 306 of the first junction box 202 at the tail end serves as the negative terminal of the perovskite photovoltaic module.
[0084] In other embodiments, among the multiple first junction boxes 202 and the multiple second junction boxes 204, the fourth connection terminal 308 of the first junction box 202 at the head end serves as the positive terminal of the perovskite photovoltaic module, the third connection terminal 306 of the first junction box 202 at the tail end is connected to the first battery connection terminal 310 of the second junction box 204 at the head end, and the second battery connection terminal 312 of the second junction box 204 at the tail end serves as the negative terminal of the perovskite photovoltaic module.
[0085] Fig. 9 Schematic diagram of circuit connection of junction box system in some other embodiments, Fig.10 for Fig. 9 The structural diagram of the junction box system in some corresponding embodiments is as follows: Fig. 9 , Fig.10 As shown, in one embodiment, the perovskite photovoltaic module also includes a second preset battery string 104; the first junction box 202 also has a fifth connection terminal 314 and a sixth connection terminal 316, the fifth connection terminal 314 is used to connect to the positive electrode of the second preset battery string 104, and the sixth connection terminal 316 is used to connect to the negative electrode of the second preset battery string 104, the fifth connection terminal 314 serves as the positive terminal of the second preset battery string 104, and the sixth connection terminal 316 serves as the negative terminal of the second preset battery string 104; the first junction box 202 also includes: a third bypass module 408, the third bypass module 408 is spaced apart from the first bypass module 402 and the voltage conversion module 404, the negative electrode 7 of the third bypass module 408 is connected to the fifth connection terminal 314, and the positive electrode 8 of the third bypass module 408 is connected to the sixth connection terminal 316. A first junction box 202 can protect the first preset battery string 102 and the second preset battery string 104 from being affected by the hot spot effect, and can also convert the output signal of the first preset battery string 102 into a target signal. The junction box system has a high degree of integration and a small shading area, which reduces the influence of the junction box system on the photoelectric conversion efficiency of the perovskite photovoltaic module.
[0086] In one embodiment, the first preset battery string 102 and the second preset battery string 104 are different types of battery strings, and the perovskite photovoltaic module includes a first preset battery string 102 and a second preset battery string 104, and the first preset battery string 102 and the second preset battery string 104 are stacked and spaced apart; wherein the fifth connection terminal 314 of the first junction box 202 is connected to the fourth connection terminal 308, serving as the positive terminal of the perovskite photovoltaic module; the sixth connection terminal 316 of the first junction box 202 is connected to the third connection terminal 306, serving as the negative terminal of the perovskite photovoltaic module, and the perovskite photovoltaic module can be connected to an external circuit through a positive terminal and a negative terminal, with a small number of cables, low cost, and simple maintenance.
[0087] Fig.11 Schematic diagram of circuit connection of junction box system in some other embodiments, Fig.12 for Fig.11 The structural diagram of the junction box system in some corresponding embodiments is as follows: Fig.11 , Fig.12 As shown, in one embodiment, the first preset battery string 102 and the second preset battery string 104 are different types of battery strings, the perovskite photovoltaic module includes a plurality of the first preset battery strings 102 arranged at intervals and a plurality of the second preset battery strings 104 connected in series, and the junction box system includes a plurality of the first junction boxes 202; the plurality of the first preset battery strings 102 and the plurality of the first junction boxes 202 are respectively connected correspondingly, and the plurality of the second preset battery strings 104 and the plurality of the first junction boxes 202 are respectively connected correspondingly;
[0088] Among the multiple first junction boxes 202, the fourth connection terminal 308 of the first junction box 202 located in the middle is connected to the third connection terminal 306 of the adjacent previous first junction box 202, and the third connection terminal 306 of the first junction box 202 located in the middle is connected to the fourth connection terminal 308 of the adjacent next first junction box 202.
[0089] like Fig.11 , Fig.12 As shown, in one embodiment, among the multiple first junction boxes 202, the fifth connection terminal 314 of the first junction box 202 at the head end is connected to the fourth connection terminal 308, serving as the positive terminal of the perovskite photovoltaic module, and the sixth connection terminal 316 of the first junction box 202 at the tail end is connected to the third connection terminal 306, serving as the negative terminal of the perovskite photovoltaic module.
[0090] Fig.13 Schematic diagram of circuit connection of junction box system in some other embodiments. Fig.14 for Fig.13The structural diagram of the junction box system in some corresponding embodiments is as follows: Fig.13 , Fig.14 As shown, in one embodiment, the perovskite photovoltaic module further includes a second preset battery string 104; the fourth connection terminal 308 is connected to the positive electrode of the second preset battery string 104, and the third connection terminal 306 is connected to the negative electrode of the second preset battery string 104;
[0091] The fourth connection terminal 308 also serves as the positive terminal of the second preset battery string, and the third connection terminal 306 also serves as the negative terminal of the second preset battery string. The first bypass module 402 in the first junction box 202 can protect the first preset battery string 102 and the second preset battery string 104 from being affected by the hot spot effect, thereby reducing the cost of the junction box system and the number of external cables.
[0092] In one embodiment, the first preset battery string 102 and the second preset battery string 104 are different types of battery strings, and the perovskite photovoltaic module includes a first preset battery string 102 and a second preset battery string 104, and the first preset battery string 102 and the second preset battery string 104 are stacked and spaced apart; wherein the fourth connection terminal 308 of the first junction box 202 serves as the positive terminal of the perovskite photovoltaic module, and the third connection terminal 306 of the first junction box 202 serves as the negative terminal of the perovskite photovoltaic module, and the perovskite photovoltaic module can be connected to an external circuit through a positive terminal and a negative terminal, with a small number of cables, low cost, and simple maintenance.
[0093] Fig.15 Schematic diagram of circuit connection of junction box system in some other embodiments. Fig.16 for Fig.15 The structural diagram of the junction box system in some corresponding embodiments is as follows: Fig.15 , Fig.16 As shown, in one embodiment, the first preset battery string 102 and the second preset battery string 104 are different types of battery strings, the perovskite photovoltaic module includes a plurality of the first preset battery strings 102 arranged at intervals and a plurality of the second preset battery strings 104 connected in series, and the junction box system includes a plurality of the first junction boxes 202; the plurality of the first preset battery strings 102 and the plurality of the first junction boxes 202 are respectively connected correspondingly, and the plurality of the second preset battery strings 104 and the plurality of the first junction boxes 202 are respectively connected correspondingly;
[0094] Among the multiple first junction boxes 202, the fourth connection terminal 308 of the first junction box 202 at the head end serves as the positive terminal of the perovskite photovoltaic module, and the third connection terminal 306 of the first junction box 202 at the tail end serves as the negative terminal of the perovskite photovoltaic module; the fourth connection terminal 308 of the first junction box 202 located in the middle is connected to the third connection terminal 306 of the adjacent previous first junction box 202, and the third connection terminal 306 of the first junction box 202 located in the middle is connected to the fourth connection terminal 308 of the adjacent next first junction box 202.
[0095] Fig.17 Schematic diagram of circuit connection of junction box system in other embodiments. Fig.18 for Fig.17 The structural diagram of the junction box system in some corresponding embodiments is as follows: Fig.17 , Fig.18 As shown, in one embodiment, the perovskite photovoltaic module further includes a second preset battery string 104; the first junction box 202 further has a seventh connection terminal 318, the seventh connection terminal 318 is connected to the positive electrode of the second preset battery string 104, and the fourth connection terminal 308 is connected to the negative electrode of the second preset battery string 104; the first junction box 202 further includes: a fourth bypass module 410, the negative electrode of the fourth bypass module 410 is connected to the seventh connection terminal 318, and the positive electrode of the fourth bypass module 410 is connected to the fourth connection terminal 308;
[0096] The seventh connection terminal 318 serves as the positive terminal of the second preset battery string 104, and the fourth connection terminal 308 also serves as the negative terminal of the second preset battery string 104. The first junction box 202 converts the output signal of the first preset battery string 102 into a target signal, and connects the target signal and the output signal of the second preset battery string 104 in series.
[0097] like Fig.17 , Fig.18 As shown, in one embodiment, the first preset battery string 102 and the second preset battery string 104 are different types of battery strings, and the perovskite photovoltaic module includes a first preset battery string 102 and a second preset battery string 104. Exemplarily, the first preset battery string 102 and the second preset battery string 104 are stacked and spaced apart; wherein the seventh connection terminal 318 of the first junction box 202 serves as the positive terminal of the perovskite photovoltaic module; the third connection terminal 306 of the first junction box 202 serves as the negative terminal of the perovskite photovoltaic module, and the perovskite photovoltaic module can be connected to an external circuit through a positive terminal and a negative terminal, with a small number of cables, low cost, and simple maintenance.
[0098] Fig.19 Schematic diagram of circuit connection of junction box system in other embodiments. Fig. 20 for Fig.19 The structural diagram of the junction box system in some corresponding embodiments is as follows: Fig.19 , Fig. 20 As shown, in one embodiment, the first preset battery string 102 and the second preset battery string 104 are different types of battery strings, the perovskite photovoltaic module includes a plurality of the first preset battery strings 102 and a plurality of the second preset battery strings 104 arranged at intervals; the junction box system includes a plurality of the first junction boxes 202;
[0099] Among the multiple first junction boxes 202, the seventh connection terminal 318 of the first junction box 202 at the head end serves as the positive terminal of the perovskite photovoltaic module, and the third connection terminal 306 of the first junction box 202 at the tail end serves as the negative terminal of the perovskite photovoltaic module; the seventh connection terminal 318 of the first junction box 202 located in the middle is connected to the third connection terminal 306 of the adjacent previous first junction box 202, and the third connection terminal 306 of the first junction box 202 located in the middle is connected to the seventh connection terminal 318 of the adjacent next first junction box 202.
[0100] like Figure 1 , Figure 2 As shown, in this embodiment, a photovoltaic system is provided, including: a perovskite photovoltaic module and a junction box system as described in any of the above items, and the parts that are the same or corresponding to the embodiments in the above junction box system will not be repeated below; the perovskite photovoltaic module includes a first preset battery string 102.
[0101] In the above photovoltaic system, after the voltage conversion module 404 of the first junction box 202 in the junction box system converts the output signal of the first preset battery string 102 into a target signal, it is led out through the third connection terminal 306 and the fourth connection terminal 308 of the first junction box 202, and the first bypass module 402 of the first junction box 202 can protect the first preset battery string 102 from the hot spot effect, simplifying the wiring system of the perovskite photovoltaic module, reducing the number of external cables, facilitating the connection and installation between the perovskite photovoltaic module and the junction box system, and simplifying subsequent maintenance, making the wiring system neat and beautiful, and reducing costs. The first junction box in the junction box system has a high degree of integration and a small shading area, which reduces the impact of the connection of the junction box system on the power and power generation of the perovskite photovoltaic module, and increases the power provided by the photovoltaic system to the load.
[0102] In one embodiment, the first preset cell string 102 includes a light-facing surface and a backlight surface disposed opposite to each other, and the junction box system is disposed on the backlight surface of the first preset cell string 102. The output signal of the first preset cell string in the perovskite photovoltaic module is converted into a target signal by the junction box system and then led out without affecting the light receiving area and photoelectric conversion efficiency of the perovskite photovoltaic module.
[0103] In one embodiment, the first preset cell string 102 includes one of a perovskite cell string and a crystalline silicon cell string.
[0104] It can be understood that the perovskite cell string includes one cell string formed by a plurality of perovskite cells connected in series, or the perovskite cell string includes a plurality of cell sub-strings formed by a plurality of perovskite cells connected in series, and a plurality of cell sub-strings are connected in parallel to form a perovskite cell string; the crystalline silicon cell string includes one cell string formed by a plurality of crystalline silicon cells connected in series, or the crystalline silicon cell string includes a plurality of cell sub-strings formed by a plurality of crystalline silicon cells connected in series, and a plurality of cell sub-strings are connected in parallel to form a crystalline silicon cell string.
[0105] like Figure 3 , Figure 4 As shown, in one embodiment, the perovskite photovoltaic module includes a first preset battery string 102 and a second preset battery string 104 which are stacked and spaced apart, one of the first preset battery string 102 and the second preset battery string 104 is a perovskite battery string, and the other is a crystalline silicon battery string. Further, the junction box system is arranged on a side of the perovskite battery string away from the crystalline silicon battery string in the perovskite photovoltaic module, and the junction box system does not affect the absorption and conversion of light energy by the crystalline silicon battery string and the perovskite battery string.
[0106] The structure A and the structure B are stacked and spaced apart, which means that the structure A and the structure B are disposed on opposite sides of the transparent insulating layer, and light can pass through the transparent insulating layer from one side to the other side of the transparent insulating layer.
[0107] The open circuit voltage of the perovskite cell is about 200V, and the short circuit current is about 2A-5A; the open circuit voltage of the crystalline silicon cell is about 60V, and the short circuit current is about 30A. The output voltage and output current of the first preset battery string 102 are converted into target voltage and target current through the voltage conversion module 404 in the first junction box 202 in the junction box system, and are led out through the third connection terminal 306 and the fourth connection terminal 308, wherein the target voltage matches the output voltage of the second preset battery string 104, and the target current matches the output current of the second preset battery string 104. While the first junction box in the wiring system is used to prevent the first preset battery string 102 from being affected by hot spots, the output signals of the first preset battery string 102 and the second preset battery string 104 with large output signal differences can be converted into matching signals for lead-out, which is simple to operate and low in cost.
[0108] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
[0109] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0110] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.
Claims
1. A junction box system based on perovskite photovoltaic modules, It is characterized in that The perovskite photovoltaic module includes a first preset battery string; the junction box system includes: A first junction box, having a first connection end, a second connection end, a third connection end and a fourth connection end, wherein the first connection end is connected to the positive electrode of the first preset battery string, the second connection end is connected to the negative electrode of the first preset battery string, the third connection end serves as the positive terminal of the first preset battery string, and the fourth connection end serves as the negative terminal of the first preset battery string; the first junction box comprises: a first bypass module, wherein a positive electrode of the first bypass module is connected to the third connection end, and a negative electrode of the first bypass module is connected to the fourth connection end; A voltage conversion module, wherein the positive input terminal of the voltage conversion module is connected to the first connection terminal, and the negative input terminal of the voltage conversion module is connected to the second connection terminal; the positive output terminal of the voltage conversion module is connected to the fourth connection terminal, and the negative output terminal of the voltage conversion module is connected to the third connection terminal; the voltage conversion module is used to convert the output signal of the first preset battery string to obtain a target signal, and the third connection terminal and the fourth connection terminal are used to lead out the target signal.
2. The junction box system according to claim 1, It is characterized in that The perovskite photovoltaic module further includes a second preset battery string; the junction box system further includes: The second junction box is spaced apart from the first junction box, and has a first battery connection end for connecting to the positive electrode of the second preset battery string, and a second battery connection end for connecting to the negative electrode of the second preset battery string, the first battery connection end serves as the positive terminal of the second preset battery string, and the second battery connection end serves as the negative terminal of the second preset battery string; the second junction box includes: A second bypass module, wherein a negative electrode of the second bypass module is connected to the first battery connection end, and a positive electrode of the second bypass module is connected to the second battery connection end.
3. The junction box system according to claim 2, It is characterized in that The first preset battery string and the second preset battery string are different types of battery strings, the perovskite photovoltaic module includes a plurality of the first preset battery strings arranged at intervals and a plurality of the second preset battery strings connected in series; the junction box system includes a plurality of the first junction boxes and a plurality of the second junction boxes; a plurality of the first preset battery strings and a plurality of the first junction boxes are respectively connected correspondingly, and a plurality of the second preset battery strings and a plurality of the second junction boxes are respectively connected correspondingly; Among the multiple first junction boxes, the fourth connection end of the first junction box located in the middle is connected to the third connection end of the adjacent previous first junction box, and the third connection end of the first junction box located in the middle is connected to the fourth connection end of the adjacent next first junction box.
4. The junction box system according to claim 3, It is characterized in that Among the multiple first junction boxes and the multiple second junction boxes, the fourth connection end of the first junction box at the head end is connected to the first battery connection end of the second junction box at the head end, serving as the positive terminal of the perovskite photovoltaic module; the third connection end of the first junction box at the tail end is connected to the second battery connection end of the second junction box at the tail end, serving as the negative terminal of the perovskite photovoltaic module.
5. The junction box system according to claim 3, It is characterized in that Among the multiple first junction boxes and multiple second junction boxes, the first battery connection end of the second junction box at the head end serves as the positive terminal of the perovskite photovoltaic module, the second battery connection end of the second junction box at the tail end is connected to the fourth connection end of the first junction box at the head end, and the third connection end of the first junction box at the tail end serves as the negative terminal of the perovskite photovoltaic module.
6. The junction box system according to claim 1, It is characterized in that The perovskite photovoltaic module also includes a second preset battery string; The first junction box further has a fifth connection terminal and a sixth connection terminal, the fifth connection terminal is used to connect to the positive electrode of the second preset battery string, the sixth connection terminal is used to connect to the negative electrode of the second preset battery string, the fifth connection terminal serves as the positive terminal of the second preset battery string, and the sixth connection terminal serves as the negative terminal of the second preset battery string; the first junction box also includes: A third bypass module, wherein a negative electrode of the third bypass module is connected to the fifth connection end, and a positive electrode of the third bypass module is connected to the sixth connection end.
7. The junction box system according to claim 6, It is characterized in that The first preset battery string and the second preset battery string are different types of battery strings, the perovskite photovoltaic module includes a plurality of the first preset battery strings arranged at intervals and a plurality of the second preset battery strings connected in series, and the junction box system includes a plurality of the first junction boxes; a plurality of the first preset battery strings and a plurality of the first junction boxes are respectively connected correspondingly, and a plurality of the second preset battery strings and a plurality of the first junction boxes are respectively connected correspondingly; Among the multiple first junction boxes, the fourth connection end of the first junction box located in the middle is connected to the third connection end of the adjacent previous first junction box, and the third connection end of the first junction box located in the middle is connected to the fourth connection end of the adjacent next first junction box.
8. The junction box system according to claim 7, It is characterized in that Among the multiple first junction boxes, the fifth connection terminal of the first junction box at the head end is connected to the fourth connection terminal as the positive terminal of the perovskite photovoltaic module, and the sixth connection terminal of the first junction box at the tail end is connected to the third connection terminal as the negative terminal of the perovskite photovoltaic module.
9. The junction box system according to claim 1, It is characterized in that The perovskite photovoltaic module further includes a second preset battery string; the fourth connection end is connected to the positive electrode of the second preset battery string, and the third connection end is connected to the negative electrode of the second preset battery string; The fourth connection end also serves as the positive terminal of the second preset battery string, and the third connection end also serves as the negative terminal of the second preset battery string.
10. The junction box system according to claim 9, It is characterized in that The first preset battery string and the second preset battery string are different types of battery strings, the perovskite photovoltaic module includes a plurality of the first preset battery strings arranged at intervals and a plurality of the second preset battery strings connected in series, and the junction box system includes a plurality of the first junction boxes; a plurality of the first preset battery strings and a plurality of the first junction boxes are respectively connected correspondingly, and a plurality of the second preset battery strings and a plurality of the first junction boxes are respectively connected correspondingly; Among them, among the multiple first junction boxes, the fourth connection end of the first junction box at the head end serves as the positive terminal of the perovskite photovoltaic module, and the third connection end of the first junction box at the tail end serves as the negative terminal of the perovskite photovoltaic module; the fourth connection end of the first junction box located in the middle is connected to the third connection end of the adjacent previous first junction box, and the third connection end of the first junction box located in the middle is connected to the fourth connection end of the adjacent next first junction box.
11. The junction box system according to claim 1, It is characterized in that The perovskite photovoltaic module further includes a second preset battery string; the first junction box further includes a seventh connection terminal, the seventh connection terminal is connected to the positive electrode of the second preset battery string, and the fourth connection terminal is connected to the negative electrode of the second preset battery string; the first junction box also includes: a fourth bypass module, wherein a negative electrode of the fourth bypass module is connected to the seventh connection end, and a positive electrode of the fourth bypass module is connected to the fourth connection end; The seventh connection terminal serves as the positive terminal of the second preset battery string, and the fourth connection terminal also serves as the negative terminal of the second preset battery string.
12. The junction box system according to claim 11, It is characterized in that The first preset battery string and the second preset battery string are different types of battery strings, the perovskite photovoltaic module includes a plurality of the first preset battery strings arranged at intervals and a plurality of the second preset battery strings arranged at intervals; the junction box system includes a plurality of the first junction boxes; Among them, among the multiple first junction boxes, the seventh connection end of the first junction box at the head end serves as the positive terminal of the perovskite photovoltaic module, and the third connection end of the first junction box at the tail end serves as the negative terminal of the perovskite photovoltaic module; the seventh connection end of the first junction box located in the middle is connected to the third connection end of the adjacent previous first junction box, and the third connection end of the first junction box located in the middle is connected to the seventh connection end of the adjacent next first junction box.
13. A photovoltaic system, It is characterized in that include: A perovskite photovoltaic module, comprising a first preset cell string; and A junction box system as claimed in any one of claims 1 to 12.
14. The photovoltaic system according to claim 13, It is characterized in that The first preset cell string includes one of a perovskite cell string and a crystalline silicon cell string; or the perovskite photovoltaic module includes a first preset cell string and a second preset cell string stacked and spaced apart, one of the first preset cell string and the second preset cell string is a perovskite cell string, and the other is a crystalline silicon cell string.