A photovoltaic module

Abstract

The present invention discloses a photovoltaic module, which belongs to the field of photovoltaic power generation technology. The photovoltaic module provided by the present invention includes a laminate, an adapter module and a junction box group. Among them, a battery total module is arranged in the laminate; the adapter module is connected in parallel to the two ends of the battery total module, and is used to adjust the output state of the battery total module; the junction box group is installed on the back of the laminate, including a first junction box, a middle junction box and a last junction box, and an adapter module is arranged in the middle junction box, and the adapter module and the other two junction boxes are interconnected in the laminate, and positive and negative cables are led outward from the middle junction box. According to this scheme, when an abnormality or disaster occurs, the output state of the photovoltaic module can be adjusted in time, thereby quickly reducing the output voltage of the photovoltaic module, which is convenient for disaster relief construction personnel to effectively control the disaster situation under the premise of ensuring the personal safety of disaster relief construction personnel.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation, and in particular to a photovoltaic module. Background Art

[0002] Photovoltaic panels convert solar energy into electrical energy and transmit the electrical energy to power supply stations.

[0003] Photovoltaic modules can be directly connected to the power supply station, that is, the output voltage of the photovoltaic modules is almost equal to the input voltage of the power supply station. In order to make the output voltage of the photovoltaic modules reach hundreds or even thousands of volts, the cells can be connected in series to form a battery pack, and several battery packs are connected in series and arranged in sequence, and then connected in sequence through cables to connect all the battery packs in series. Due to the rapid growth of the photovoltaic module market demand and the rapid development of photovoltaic module technology, solar photovoltaic power stations have been widely distributed around the world. However, with the increase in power stations, the reliability problems of some power stations have gradually been exposed, and sometimes fires are caused by power station reliability problems. However, due to the high voltage of the module system, even up to 1500V, it brings inconvenience and great safety hazards to disaster relief construction workers. Summary of the invention

[0004] In order to solve the above-mentioned problem that due to the large voltage of the component system, when reliability problems occur and cause fires, it brings inconvenience to disaster relief construction workers and great safety hazards, the present invention provides a photovoltaic component that can be intelligently shut down.

[0005] A photovoltaic module provided according to an embodiment of the present invention includes:

[0006] A laminate, wherein a battery module is arranged in the laminate;

[0007] A switching module, which is connected in parallel to both ends of the battery module and is used to adjust the output state of the battery module;

[0008] A junction box group is installed on the back of the laminate, and includes a first junction box, a middle junction box and a last junction box. The middle junction box is provided with the adapter module, and the adapter module is interconnected with the other two junction boxes in the laminate, and positive and negative cables are led outward from the middle junction box.

[0009] In one embodiment, it includes a first bus bar and a second bus bar, one end of the first bus bar is connected to the battery total module, the other end of the first bus bar is connected to the adapter module, one end of the second bus bar is connected to the battery total module, and the other end of the second bus bar is connected to the adapter module, so that the adapter module is connected in parallel to the two ends of the battery total module through the first bus bar and the second bus bar.

[0010] In one embodiment, a third bus bar and a fourth bus bar are further included, wherein the third bus bar is used to lead out the anode of the battery module, and the fourth bus bar is used to lead out the cathode of the battery module.

[0011] One end of the first bus bar is connected to the battery module, specifically:

[0012] One end of the first bus bar is connected to the fourth bus bar;

[0013] One end of the second bus bar is connected to the battery module, specifically:

[0014] One end of the second bus bar is connected to the third bus bar.

[0015] In one embodiment, the positive and negative cables extending outward from the middle junction box serve as output ends of the photovoltaic assembly.

[0016] In one embodiment, the battery module includes a first battery group, a middle battery group and a last battery group, and the first battery group, the middle battery group and the last battery group are connected to the first junction box, the middle junction box and the last junction box in a one-to-one correspondence.

[0017] In one embodiment, a fifth bus bar and a sixth bus bar are further included.

[0018] One end of the fifth bus bar is connected to the cathode of the first battery group, and the other end is connected to the anode of the middle battery group, so as to connect the first battery group and the middle battery group in series;

[0019] One end of the sixth bus bar is connected to the cathode of the middle battery group, and the other end is connected to the anode of the last battery group, so as to connect the middle battery group and the last battery group in series.

[0020] In one embodiment, the first battery group includes a plurality of first battery strings connected in parallel, the middle battery group includes a plurality of middle battery strings connected in parallel, and the last battery group includes a plurality of last battery strings connected in parallel.

[0021] In one embodiment, the adapter module includes an energy-consuming element, a switch and a resistor. The energy-consuming element is connected in series with the resistor, and the switch is connected in parallel to both ends of the energy-consuming element. The variable resistance value of the adapter module is achieved by opening or closing the switch.

[0022] In one embodiment, the resistance of the resistor ranges from 100KΩ to 500KΩ.

[0023] In one embodiment, the resistance of the energy dissipation element is 40 to 80 times the resistance of the resistor.

[0024] Compared with the prior art, the photovoltaic module provided by the present invention sets an adapter module in the junction box and connects the adapter module in parallel at both ends of the battery module. The output state of the photovoltaic module can be adjusted by using the adapter module. When an abnormality or disaster occurs, the output state of the photovoltaic module can be adjusted in time, thereby controlling the disaster and the safety of the operator. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 is a schematic diagram of a photovoltaic module according to an embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of another photovoltaic module according to an embodiment of the present invention;

[0028] Figure 3 is a schematic diagram of a photovoltaic assembly when a switch of a switching module is disconnected in an embodiment of the present invention;

[0029] Figure 4 Schematic diagram of a photovoltaic assembly when a switch of a switching module is closed in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the specific embodiments of the present invention and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0031] The embodiment of the present invention provides a photovoltaic assembly for solving the technical problem in the prior art that when a fire occurs in a power station due to reliability problems, the system voltage is relatively large, which causes inconvenience and great safety hazards to disaster relief workers.

[0032] See also Figure 3As shown, an embodiment of the present invention provides a photovoltaic module, including a laminate, a junction box group installed on the back of the laminate, and a switching module arranged in the junction box group, wherein the laminate includes a cover plate, a battery module and a back plate stacked together from top to bottom. The switching module is connected in parallel to both ends of the battery module to adjust the output voltage and current of the battery module; the junction box group is installed on the back of the laminate, including a first junction box, a middle junction box and a last junction box, and the switching module is arranged in the middle junction box, and the switching module and the other two junction boxes (first junction box Es and last junction box En) are interconnected in the laminate, and positive and negative cables are led out from the middle junction box.

[0033] In the embodiment of the present invention, the switching module and the other two junction boxes are interconnected in the laminate, so there is no need to separately set a connection interface and an external cable outside the laminate, and therefore, there is no need to add additional external cables.

[0034] In the embodiment of the present invention, the photovoltaic assembly further includes a first bus bar L1 and a second bus bar L2, one end of the first bus bar L1 is connected to the battery module, the other end of the first bus bar L1 is connected to the adapter module, one end of the second bus bar L2 is connected to the battery module, and the other end of the second bus bar L2 is connected to the adapter module, so that the adapter module is connected in parallel to the two ends of the battery module through the first bus bar L1 and the second bus bar L2. The first bus bar L1 and the second bus bar L2 are arranged inside the laminate, so that the parallel connection of the adapter module and the battery module in the embodiment of the present invention does not require exposed cables to achieve.

[0035] Furthermore, the photovoltaic module of the embodiment of the present invention further includes a third bus bar L3 and a fourth bus bar L4, wherein the third bus bar L3 is used to lead out the anode of the battery module, and the fourth bus bar L4 is used to lead out the cathode of the battery module. One end of the first bus bar L1 is connected to the battery module, specifically: one end of the first bus bar L1 is connected to the fourth bus bar L4, and similarly, one end of the second bus bar L2 is connected to the battery module, specifically: one end of the second bus bar L2 is connected to the third bus bar L3. Since the third bus bar L3 is used to lead out the anode of the battery module, any connection point on the third bus bar L3 is an equipotential point of the anode of the battery module. Similarly, any connection point on the fourth bus bar L4 is an equipotential point of the cathode of the battery module. Therefore, the anode and cathode of the battery module are led out through the third bus bar L3 and the fourth bus bar L4, and then the third bus bar L3 and the fourth bus bar L4 are connected to achieve the technical effect of parallel connection with the battery module, which is convenient for connection and simplifies the layout of the circuit, thereby overcoming the entanglement of the circuit caused by the need to connect to the cathode and anode of the battery module and the safety problems caused by the entanglement of the circuit.

[0036] In an embodiment of the present invention, the positive and negative cables extending outward from the middle junction box Em serve as the output ends of the photovoltaic module, and multiple photovoltaic modules can be connected in series and then connected to an energy storage device, a load through an inverter, or a grid-connected mains through an inverter.

[0037] In the embodiment of the present invention, the battery module includes a first battery group Es, a middle battery group Em and a last battery group En, and the first battery group Es, the middle battery group Em and the last battery group En are connected to the first junction box Bs, the middle junction box Bm and the last junction box Bn in a one-to-one correspondence. For example, the first junction box Bs is connected to the first battery group Es, the middle junction box Bm is connected to the middle battery group Em, and the last junction box Bn is connected to the last battery group En.

[0038] Furthermore, the photovoltaic module in the embodiment of the present invention also includes a fifth bus bar L5 and a sixth bus bar L6, one end of the fifth bus bar L5 is connected to the cathode of the first battery group Es, and the other end is connected to the anode of the middle battery group Em, which is used to connect the first battery group Es and the middle battery group Em in series; one end of the sixth bus bar L6 is connected to the cathode of the middle battery group Em, and the other end is connected to the anode of the last battery group En, which is used to connect the middle battery group Em and the last battery group En in series.

[0039] In the embodiment of the present invention, the first battery group Es may include a plurality of first battery strings connected in parallel, the middle battery group Em may include a plurality of middle battery strings connected in parallel, and the last battery group En may include a plurality of last battery strings connected in parallel. Figure 2As shown, the first battery group Es may include a first battery string Es1 and a first battery string Es2 connected in parallel, the middle battery group Em may include a plurality of middle battery strings Em1 and Em2 connected in parallel, and the last battery group En includes a plurality of last battery strings En1 and En2 connected in parallel.

[0040] It is pointed out here that the number of battery strings included in the first battery group, the middle battery group and the last battery group is not limited to two. Based on the current planar circuit boards, the present invention only takes each battery group (first battery group, middle battery group and last battery group) as an example to explain two parallel battery string groups, and it is not a specific limitation on the number of first battery strings included in the first battery group, the number of middle battery strings included in the middle battery group and the number of last battery strings included in the last battery group. In addition, the number of first battery strings included in the first battery group, the number of middle battery strings included in the middle battery group and the number of last battery strings included in the last battery group can be the same or different, and no specific limitation is made here.

[0041] It is pointed out here that in order to facilitate description and simplify the complexity of the circuit, the embodiment of the present invention only takes the example of two battery strings included in each battery group (that is, the first battery group Es includes the first battery string Es1 and the first battery string Es2, the middle battery group Em includes the middle battery string Em1 and the middle battery string Em2, and the last battery group En includes the last battery string En1 and the last battery string En2). It is not a limitation on the battery strings included in each battery group, and more or fewer battery groups may be included. If more battery strings are included, it is only necessary to connect more battery strings in parallel.

[0042] In an embodiment of the present invention, the first bus bar L1, the second bus bar L2, the third bus bar L3, the fourth bus bar L4, the fifth bus bar L5 and the sixth bus bar L6 are all arranged inside the laminate. The first bus bar L1 and the second bus bar L2 can be arranged on the same layer, and the third bus bar L3, the fourth bus bar L4, the fifth bus bar L5 and the sixth bus bar L6 are arranged above or below the layer where the first bus bar L1 is located. In order to avoid safety hazards caused by contact between the bus bars, an isolation module is arranged between the layer where the first bus bar L1 is located and the layer where the third bus bar L3 is located, so as to effectively avoid safety problems caused by contact between the two layers of bus bars.

[0043] In the embodiment of the present invention, the adapter module includes a first input terminal 11, an output terminal 12, a second input terminal 13, and also includes an energy-consuming element Ec, a switch S, a resistor R and a third input terminal 14. The energy-consuming element Ec and the switch S are connected in parallel between the second input terminal 13 and the third input terminal 14; the resistor R is connected in series between the output terminal 12 and the third input terminal 14. In this way, when the switch is disconnected, the resistor R and the energy-consuming element Ec are connected in series with the battery total module, and the output voltage of the photovoltaic module is the voltage across the resistor R; and when the switch is closed, the energy-consuming element Ec is short-circuited, the resistor R is connected in parallel with the battery pack, and the output voltage of the photovoltaic module is the voltage of the battery total module. Among them, the energy-consuming element can be a pure resistance element or an energy-consuming device whose resistance meets the requirements, and the embodiment of the present invention does not specifically limit it.

[0044] In the embodiment of the present invention, the resistance of the resistor is 100KΩ-500KΩ, such as 100KΩ, 300KΩ or 500KΩ, and the resistance of the energy-consuming element is 40-80 times. It is pointed out that the energy-consuming element Ec can be a resistor or an energy-consuming element whose resistance meets the requirements, such as lighting equipment, exhaust equipment, etc., which is not specifically limited here.

[0045] In the photovoltaic assembly of the embodiment of the present invention, when a problem such as a fire occurs in the photovoltaic power station, after the switch S receives a signal such as "0" representing "disconnect switch" sent by the transmitter, the switch S is disconnected, and the energy-consuming element Ec, the battery module and the resistor R1 are connected in series, see Figure 3 As shown, the output voltage at this time is the voltage across the resistor R. Since the resistance of the energy-consuming element is 40-80 times that of the resistor R, the resistance of the energy-consuming component Ec is very large, which is equivalent to the photovoltaic component being turned off. At this time, the output current of the photovoltaic component is very small, so the voltage across the resistor R is also very small, that is, the output voltage is very small, which has a positive effect when a fire or abnormal accident occurs, and can effectively ensure the safe operation of disaster relief firefighters. At the same time, a lower output voltage can effectively control the further expansion of the disaster.

[0046] When the power station returns to normal, the switch S receives a signal such as "1" from the transmitter, which represents "close the switch", and the switch S is closed. At this time, the energy-consuming element Ec is short-circuited. The actual circuit can be seen in Figure 4 As shown, at this time, the resistor R is connected in parallel with the battery module, and the output voltage is the voltage of the battery module. At the same time, compared with the resistance of the battery module, the resistor R is already a large resistor, and its shunt effect is very small. Therefore, it does not affect the output current and output voltage.

[0047] The photovoltaic module provided by the embodiment of the present invention has a switching module with a variable resistance value in the middle junction box, and the output voltage and current of the photovoltaic module are adjusted by connecting resistors of different resistance values ​​to the photovoltaic module under different circumstances. Therefore, when an abnormality or disaster occurs, the present solution can timely adjust the output state of the photovoltaic module, thereby quickly reducing the output voltage of the photovoltaic module, which is convenient for disaster relief construction personnel to effectively control the disaster while ensuring the personal safety of disaster relief construction personnel. At the same time, in the embodiment of the present invention, there is no need to add extra cables, and there is no need to add external terminals for connection. The cost of external terminals is expensive. Therefore, the photovoltaic module of the embodiment of the present invention does not increase the cost of the photovoltaic module while achieving intelligent shutdown, which is convenient for mass production.

[0048] The specific examples described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A photovoltaic module, characterized in that: include: A laminate, wherein a battery module is arranged in the laminate; A switching module, which is connected in parallel to both ends of the battery module and is used to adjust the output state of the battery module; A junction box group, which is installed on the back of the laminate, and includes a first junction box, a middle junction box and a last junction box. The middle junction box is provided with the adapter module, which is interconnected with the other two junction boxes in the laminate, and positive and negative cables are led outward from the middle junction box; The positive and negative cables extending outward from the middle junction box serve as output ends of the photovoltaic module; The adapter module includes an energy-consuming element, a switch and a resistor, wherein the energy-consuming element is connected in series with the resistor, the switch is connected in parallel to both ends of the energy-consuming element, one end of the switch is connected to one end of the battery module, the other end of the switch is connected to a cable leading outward, the resistor is connected in parallel between the two cables leading outward, and the variable resistance value of the adapter module is realized by opening or closing the switch; The resistance of the energy dissipation element is 40 to 80 times the resistance of the resistor.

2. The photovoltaic module according to claim 1, characterized in that: It includes a first bus bar and a second bus bar, one end of the first bus bar is connected to the battery total module, the other end of the first bus bar is connected to the adapter module, one end of the second bus bar is connected to the battery total module, and the other end of the second bus bar is connected to the adapter module, so that the adapter module is connected in parallel to the two ends of the battery total module through the first bus bar and the second bus bar.

3. The photovoltaic module according to claim 2, characterized in that: It also includes a third bus bar and a fourth bus bar, the third bus bar is used to lead out the anode of the battery module, and the fourth bus bar is used to lead out the cathode of the battery module; One end of the first bus bar is connected to the battery module, specifically: One end of the first bus bar is connected to the fourth bus bar; One end of the second bus bar is connected to the battery module, specifically: One end of the second bus bar is connected to the third bus bar.

4. The photovoltaic module according to claim 1, characterized in that: The battery module comprises a first battery group, a middle battery group and a last battery group, and the first battery group, the middle battery group and the last battery group are connected to the first junction box, the middle junction box and the last junction box in a one-to-one correspondence.

5. The photovoltaic module according to claim 4, characterized in that: further comprising a fifth bus bar and a sixth bus bar, One end of the fifth bus bar is connected to the cathode of the first battery group, and the other end is connected to the anode of the middle battery group, so as to connect the first battery group and the middle battery group in series; One end of the sixth bus bar is connected to the cathode of the middle battery group, and the other end is connected to the anode of the last battery group, so as to connect the middle battery group and the last battery group in series.

6. The photovoltaic module according to claim 4, characterized in that: The first battery group includes a plurality of first battery strings connected in parallel, the middle battery group includes a plurality of middle battery strings connected in parallel, and the last battery group includes a plurality of last battery strings connected in parallel.

7. The photovoltaic module according to claim 6, characterized in that: The resistance value of the resistor ranges from 100KΩ to 500KΩ.

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