A photovoltaic module

Abstract

The present invention discloses a photovoltaic module, including a battery module, an adapter module, a junction box group and a first bus bar. The laminate is provided with a battery module, and the battery module includes a first battery group and a last battery group that are sequentially connected in series and arranged in sequence; the junction box group includes a first junction box and a last junction box, which are respectively connected to the first battery group and the last battery group; the adapter module is arranged in the last junction box, and is connected in parallel to the two ends of the battery module to adjust the output voltage and current of the battery module; one end of the first bus bar is connected to one end of the battery module, and the other end is connected to the adapter module; the first bus bar is arranged in the laminate. In this scheme, by arranging the adapter module in the last junction box, and connecting the adapter module in parallel to the two ends of the battery module, the output voltage and current of the photovoltaic module can be adjusted by using the adapter module. When an abnormality or disaster occurs, the output voltage and current of the photovoltaic module can be adjusted in time, so as to control the disaster and the safety of the operator.

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 power stations, that is, the output voltage of photovoltaic modules is almost equal to the input voltage of the power station. In order to make the output voltage of the volt module 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 wires 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. Sometimes fires are caused by power station reliability problems. 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 the present invention comprises:

[0006] A laminate, wherein a battery module is provided in the laminate, and the battery module comprises a first battery group and a last battery group which are connected in series and arranged in sequence;

[0007] A junction box group, the junction box group includes a first junction box and a last junction box, which are respectively connected to the first battery group and the last battery group in the battery module;

[0008] A switching module, which is disposed in the terminal box and connected in parallel to both ends of the battery module, and is used to adjust the output voltage and current of the battery module;

[0009] A first bus bar, one end of which is connected to the first junction box to be connected to one end of the battery module, and the other end of which is connected to the last junction box and connected to the adapter module; wherein the first bus bar is arranged in the laminate.

[0010] In one embodiment, a resistor, an energy-consuming element, and a switch are provided in the adapter module. The resistor is connected in series with the energy-consuming element, and the switch is connected in parallel at both ends of the energy-consuming element. The switch receives a signal sent by the transmitter to switch to an open or closed state, thereby adjusting the output voltage and current of the photovoltaic component.

[0011] In one embodiment, the resistance of the resistor ranges from 100KΩ to 500KΩ.

[0012] In one embodiment, the resistance of the energy dissipation element is 40 to 80 times the resistance of the resistor.

[0013] In one embodiment, two cables with opposite polarities are led out from two ends of the resistor in the terminal box to serve as output ends of the photovoltaic module.

[0014] In one embodiment, a second bus bar is further included for leading out the cathode of the first battery group.

[0015] One end of the first bus bar is connected to the first junction box to be connected to one end of the battery module, specifically:

[0016] One end of the first bus bar is connected to a second bus bar; wherein the second bus bar is disposed within the laminate.

[0017] In one embodiment, a third bus bar is further included, one end of the third bus bar is connected to the anode of the last battery group, and the other end is connected to the output end of the adapter module. The adapter module is connected in parallel to the two ends of the battery module through the first bus bar, the second bus bar and the third bus bar; wherein the third bus bar is arranged in the laminate.

[0018] In one embodiment, the battery module further includes a middle battery pack, the junction box group further includes a middle junction box, and the middle battery pack is connected to the middle junction box accordingly.

[0019] In one embodiment, a fourth bus bar and a fifth bus bar are further included.

[0020] One end of the fourth bus bar is connected to the cathode of the last battery group, and the other end of the fourth bus bar is connected to the anode of the middle battery group, so as to realize the series connection between the middle battery group and the last battery group;

[0021] One end of the fifth bus bar is connected to the cathode of the middle battery group, and the other end of the fifth bus bar is connected to the anode of the first battery group, so as to realize the series connection of the middle battery group and the first battery group;

[0022] Wherein, the fourth bus bar and the fifth bus bar are arranged in the laminate.

[0023] In one embodiment, the first battery group includes a plurality of first battery strings, the middle battery group includes a plurality of middle battery strings, and the last battery group includes a plurality of last battery strings.

[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 voltage and current of the photovoltaic module can be adjusted by using the adapter module. When an abnormality or disaster occurs, the output voltage and current of the photovoltaic module can be adjusted in time, thereby controlling the disaster and the safety of the operators. 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 This is a schematic diagram of the structure of a photovoltaic module in an embodiment of the present invention;

[0027] Figure 2 A schematic diagram of the structure of a switching module in an embodiment of the present invention;

[0028] Figure 3 is a schematic structural diagram of another photovoltaic module in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the structure of another photovoltaic module in an embodiment of the present invention;

[0030] Figure 5 It is a schematic diagram of the structure of the photovoltaic assembly when the switch of the adapter module is disconnected in an embodiment of the present invention;

[0031] Figure 6 It is a schematic diagram of the structure of the photovoltaic assembly when the switch of the adapter module is closed in an embodiment of the present invention. DETAILED DESCRIPTION

[0032] 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.

[0033] See also Figure 1 As shown, an embodiment of the present invention provides a photovoltaic module, including a laminate, a junction box group, a switching module and a first bus bar.

[0034] A battery total module is provided in the laminate, and the battery total module includes a first battery group Es and an end battery group En which are sequentially connected in series and arranged sequentially;

[0035] The junction box group includes a first junction box Bs and a last junction box Bn, which are respectively connected to the first battery group and the last battery group in the battery module; specifically, the first junction box Bs is connected to the two ends of the first battery group Es, and the last junction box Bn is connected to the two ends of the last battery group En. It is pointed out that diodes are provided in the first junction box Bs and the last junction box Bn to prevent the reverse transmission of current in the first battery group Es and the last battery group En.

[0036] In the terminal box, in addition to the above-mentioned diode to prevent reverse current transmission, a switching module is also provided. The switching module is connected in parallel to the two ends of the battery total module in the laminate to adjust the output voltage and output current of the photovoltaic module.

[0037] One end of the first bus bar L1 is connected to the first junction box to be connected to one end of the battery module, and the other end of the first bus bar is connected to the last junction box Bn and connected to the adapter module; wherein the first bus bar is arranged in the laminate.

[0038] In the embodiments of the present invention, see Figure 2 As shown, the adapter module is provided with a resistor R, an energy-consuming element Ec and a switch S, wherein the resistor R is connected in series with the energy-consuming element Ec, and the switch S is connected in parallel at both ends of the energy-consuming element Ec. The switch S receives a signal sent by a transmitter to switch to an open or closed state, thereby adjusting the output voltage and current of the photovoltaic module. Specifically, when the switch is in a "closed" state, if a signal such as "disconnect" is received from the transmitter, the switch is switched to an "open" state; and when the switch is in an "open" state, if a signal such as "close" is received from the transmitter, the switch is switched to a "closed" state. Specifically, the adapter module may include a first input terminal 11, an output terminal 12, a second input terminal 13 and a fourth input terminal 14, wherein the resistor R is connected in series between the third input terminal 14 and the output terminal 12, and the energy-consuming element Ec and the switch are connected in parallel between the second input terminal 13 and the third input terminal 14.

[0039] Further, the resistance value of the resistor R ranges from 100KΩ to 500KΩ, such as 100KΩ, 350KΩ or 500KΩ. The resistance value of the energy dissipation element Ec is 40 to 80 times the resistance value of the resistor, such as 40 times the resistance value of the resistor, 60 times the resistance value of the resistor, or 80 times the resistance value of the resistor.

[0040] In an embodiment of the present invention, two cables with opposite polarities are led out from the two ends of the resistor in the terminal box Bn as the output end of the photovoltaic module. Multiple photovoltaic modules can be connected in series, and then connected to an energy storage device, a load through an inverter, or connected to the grid through an inverter. Specifically, two cables with opposite polarities are led out from the third input terminal 14 and the output terminal 12 respectively, and a resistor R is connected in series between the third input terminal 14 and the output terminal 12. Therefore, the output voltage of the photovoltaic module is the output voltage at both ends of the resistor R. When the switch S is in two different states of "open" and "closed", the resistance in the entire photovoltaic module is very different. Therefore, the voltage at both ends of the resistor R is also quite different. Therefore, the embodiment of the present invention can achieve the technical effect of controlling the output voltage and current by switching the state of the switch S.

[0041] In the embodiment of the present invention, a second bus bar L2 is further included, which is used to lead out the cathode of the first battery group Es.

[0042] One end of the first bus bar is connected to the first junction box to be connected to one end of the battery module, specifically:

[0043] One end of the first bus bar L1 is connected to the cathode of the first battery group by being connected to the second bus bar L2; wherein the second bus bar is disposed in the laminate.

[0044] In the embodiments of the present invention, see Figure 3 As shown, it also includes a third bus bar L3, one end of the third bus bar L3 is connected to the anode of the last battery group En, and the other end is connected to the output end 12 of the adapter module, and the adapter module is connected in parallel at both ends of the battery total module through the first bus bar L1, the second bus bar L2 and the third bus bar L3; wherein the third bus bar L3 is arranged in the laminate.

[0045] In an embodiment of the present invention, the total battery module in the laminate also includes a middle battery pack Em, and the junction box group also includes a middle junction box Bm. The middle battery pack Em is correspondingly connected to the middle junction box Bm. Specifically, the middle junction box Bm is connected in parallel at both ends of the middle battery pack Em to prevent reverse transmission of current in the middle battery pack Em.

[0046] Furthermore, the photovoltaic assembly in the embodiment of the present invention further includes a fourth bus bar L4 and a fifth bus bar L5.

[0047] One end of the fourth bus bar L4 is connected to the cathode of the last battery group En, and the other end of the fourth bus bar L4 is connected to the anode of the middle battery group Em, so as to realize the series connection of the middle battery group Em and the last battery group En;

[0048] One end of the fifth bus bar L5 is connected to the cathode of the middle battery group Em, and the other end of the fifth bus bar L5 is connected to the anode of the first battery group Es, so as to realize the series connection between the middle battery group and the first battery group;

[0049] Wherein, the fourth bus bar L4 and the fifth bus bar L5 are arranged in the laminate.

[0050] In the embodiments of the present invention, see Figure 4 As shown, the first battery group Es includes several first battery strings, such as the first battery string Es1 and the first battery string Es2; the middle battery group includes several middle battery strings, such as the middle battery string Em1 and the first battery string Em2; the last battery group En includes several last battery strings, such as the last battery string En1 and the last battery string En2.

[0051] 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 Es, middle battery group Em and last battery group En) as an example to explain that it includes 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 may be the same or different, and no specific limitation is made here.

[0052] When the adapter module is disposed in the final junction box Bn, the volume of the final junction box Bn may be larger than the middle junction box Bm and the first junction box Bs. Thus, when the junction box with the adapter module installed needs to be directly operated, the operator can quickly find the junction box.

[0053] 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 R are connected in series, see Figure 5 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.

[0054] 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 6 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.

[0055] In the embodiment of the present invention, the adapter module may also be arranged in the first junction box. When arranged in the first junction box, it is only necessary for the first bus bar to be connected between the anode of the last battery group and the output terminal 12 of the adapter module.

[0056] The photovoltaic module provided by the embodiment of the present invention is provided with a switching module with a variable resistance in the final junction box or the first 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 voltage and current 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.

[0057] 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, It is characterized in that include: A laminate, wherein a battery module is provided in the laminate, and the battery module comprises a first battery group and a last battery group which are connected in series and arranged in sequence; A junction box group, the junction box group includes a first junction box and a last junction box, which are respectively connected to the first battery group and the last battery group in the battery module; A switching module, which is disposed in the terminal box and connected in parallel to both ends of the battery module, and is used to adjust the output voltage and current of the battery module; A first bus bar, one end of which is connected to the first junction box to be connected to one end of the battery module, and the other end of which is connected to the last junction box and connected to the adapter module; wherein the first bus bar is arranged in the laminate; The adapter module is provided with a resistor, an energy-consuming element and a switch, wherein the resistor is connected in series with the energy-consuming element, and the switch is connected in parallel at both ends of the energy-consuming element. The switch receives a signal sent by the transmitter to switch to an open or closed state, thereby adjusting the output voltage and current of the photovoltaic module; The resistance of the energy-consuming element is 40 to 80 times that of the resistor. Two cables with opposite polarities are led out from both ends of the resistor in the terminal box to serve as output ends of the photovoltaic module.

2. The photovoltaic module according to claim 1, It is characterized in that The resistance value of the resistor ranges from 100KΩ to 500KΩ.

3. The photovoltaic module according to claim 1, It is characterized in that It also includes a second bus bar for leading out the cathode of the first battery group, One end of the first bus bar is connected to the first junction box to be connected to one end of the battery module, specifically: One end of the first bus bar is connected to a second bus bar; wherein the second bus bar is disposed within the laminate.

4. The photovoltaic module according to claim 1, It is characterized in that It also includes a third bus bar, one end of which is connected to the anode of the last battery group, and the other end is connected to the output end of the adapter module. The adapter module is connected in parallel to the two ends of the battery module through the first bus bar, the second bus bar and the third bus bar; wherein the third bus bar is arranged in the laminate.

5. The photovoltaic module according to claim 1, It is characterized in that The battery module further includes a middle battery pack, the junction box group further includes a middle junction box, and the middle battery pack is connected to the middle junction box accordingly.

6. The photovoltaic module according to claim 5, It is characterized in that Also includes a fourth bus bar and a fifth bus bar, One end of the fourth bus bar is connected to the cathode of the last battery group, and the other end of the fourth bus bar is connected to the anode of the middle battery group, so as to realize the series connection between the middle battery group and the last battery group; One end of the fifth bus bar is connected to the cathode of the middle battery group, and the other end of the fifth bus bar is connected to the anode of the first battery group, so as to realize the series connection of the middle battery group and the first battery group; Wherein, the fourth bus bar and the fifth bus bar are arranged in the laminate.

7. The photovoltaic module according to claim 5, It is characterized in that The first battery group includes a plurality of first battery strings, the middle battery group includes a plurality of middle battery strings, and the last battery group includes a plurality of last battery strings.

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