A photovoltaic module

Abstract

The application relates to the technical field of photovoltaic modules, and provides a photovoltaic module, which comprises two battery modules arranged symmetrically, and the two battery modules are electrically connected through end bus bars, middle bus bars, first jumper bus bars and second jumper bus bars; the battery module comprises first battery string units, second battery string units and third battery string units connected in series; the first jumper bus bar is arranged between the first battery string units and the second battery string units; and the second jumper bus bar is arranged between the second battery string units and the third battery string units. Embodiments of the application comprise two battery modules arranged symmetrically, two jumper bus bars are arranged in the circuit, the first jumper bus bar adopts a shared bus bar design, the jumper bus bar is not directly connected with the middle bus bar, but is connected through two different junction boxes, so that the current path of the whole module battery is optimized, internal power loss is reduced, and power loss caused by a significant increase in the Voc of the module is reduced.

Description

Technical Field

[0001] This application relates to the field of photovoltaic module technology, and in particular to a frame structure and splicing outer frame for a photovoltaic module. Background Technology

[0002] With the continuous development of the photovoltaic solar cell industry, the market demand for photovoltaic module power is increasing. How to improve the power of photovoltaic modules while reducing module costs has been a constant concern for researchers. Therefore, those skilled in the art have started with cell size, increasing module power by expanding the size of cells through segmented assembly. However, currently available conventional cells are simply segmented without optimizing the internal circuit design. As cell size increases, the cell current inevitably increases, leading to higher internal electrical losses in the photovoltaic module, which in turn results in lower module power. At the same time, multi-segment layout design presents challenges such as high manufacturing difficulty and high microcrack rate. All of these factors will affect the industrial application of multi-segment modules.

[0003] Therefore, how to increase power by increasing the number of cells while simultaneously addressing the power loss of solar cell modules caused by the significant increase in module Voc due to the increased number of cells, and improving the power loss of hot spots in solar cell modules, is a technical problem that urgently needs to be solved. Utility Model Content

[0004] To address at least one of the aforementioned technical problems, this application provides a photovoltaic module comprising two symmetrically arranged battery modules and two jumper busbars internally configured. The first jumper busbar adopts a shared busbar design, and the jumper busbar is not directly connected to the central busbar but is connected through two different junction boxes. This optimizes the current path of the entire module's batteries, reduces internal power loss, and lowers the module's Voc and power loss while increasing the number of batteries, thereby improving the photovoltaic module's power generation efficiency.

[0005] Therefore, this application provides a photovoltaic module, comprising: two symmetrically arranged battery modules, the two battery modules being electrically connected via an end busbar, a middle busbar, a first jumper busbar, and a second jumper busbar, the middle busbar being disposed between the two battery modules, and the end busbars being symmetrically disposed at the other ends of the two battery modules along the middle busbar; the battery module includes a first battery string unit, a second battery string unit, and a third battery string unit connected in series; the first jumper busbar is disposed between the first battery string unit and the second battery string unit, one end of the first jumper busbar being electrically connected to the end busbar, and the other end being electrically connected to the middle busbar via a first junction box; the second jumper busbar is disposed between the second battery string unit and the third battery string unit, one end of the second jumper busbar being electrically connected to the third battery string unit, and the other end being electrically connected to the middle busbar via a second junction box.

[0006] In one possible implementation, the first battery string unit and the second battery string unit share a first jumper busbar for electrical connection.

[0007] In one possible implementation, the first, second, and third battery string units each include two parallel battery strings, with the electrodes of adjacent battery string units facing opposite directions.

[0008] In one possible implementation, the solar cell is an uncut rectangular solar cell with a length of 158-230 mm and a width of 30-120 mm.

[0009] In one possible implementation, the distance between adjacent battery string units is 0.5-8 mm, and the distance between adjacent battery cells is -1-1.5 mm.

[0010] In one possible implementation, bent leads are provided at the connection points of the first jumper busbar, the second jumper busbar, and the middle busbar, and the bent leads are electrically connected to the circuit inside the first junction box / second junction box.

[0011] In one possible implementation, both the first jumper busbar and the second jumper busbar are conductive metal strips with a width of 2-10 mm and a thickness of 0.1-0.5 mm.

[0012] In one possible implementation, an insulating material is provided at the electrical connection between the second jumper bus and the third battery string unit. The thickness of the insulating material is 0.03-0.5 mm, and the width of the insulating material is greater than or equal to the width of the second jumper bus.

[0013] In one possible implementation, two diodes are provided in the first junction box. The two diodes are symmetrically arranged on both sides of the first jumper busbar, and there is a first jumper connection point between the two diodes. The first jumper connection point is used to connect the first jumper busbars of the two battery modules.

[0014] In one possible implementation, a third diode is provided inside the second junction box. One end of the third diode is connected to the central busbar, and the other end is connected to the second jumper connection point, which is used to connect the second jumper busbars of the two battery modules.

[0015] Compared with the prior art, the photovoltaic module provided in this application has the following advantages: the photovoltaic module includes two symmetrically arranged battery modules, and two jumper busbars are set inside the circuit. Two diodes can be placed in the same junction box and connected in the same junction box, which optimizes the current path of the entire module battery, reduces internal power loss, and reduces the power loss of the module due to the significant increase in Voc while increasing the number of batteries, thereby improving the power generation efficiency of the photovoltaic module.

[0016] Other features and advantages of this invention will be described in detail in the following detailed embodiments section. Attached Figure Description

[0017] The accompanying drawings used in the description of the embodiments or prior art are briefly introduced below.

[0018] Figure 1 This is a schematic diagram of the structure of a photovoltaic module provided in an embodiment of this application;

[0019] Figure 2 A schematic diagram of the circuit structure of a photovoltaic module provided in an embodiment of this application;

[0020] Figure 3 This is a schematic diagram of the internal circuit structure of the first junction box provided in an embodiment of this application;

[0021] Figure 4 This is a schematic diagram of the internal circuit structure of the second junction box provided in an embodiment of this application.

[0022] In the picture:

[0023] 100, Battery module; 110, First battery string unit; 120, Second battery string unit; 130, Third battery string unit; 200, End busbar; 300, Middle busbar; 400, First jumper busbar; 500, Second jumper busbar; 600, First junction box; 610, First diode; 620, Second diode; 700, Second junction box; 710, Third diode; 800, Connecting point. Detailed Implementation

[0024] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0025] In the description of this application, the terms “center,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation", "connection" and "joining" should be interpreted broadly, for example, they can be fixed connections, detachable connections, mating connections or integral connections; those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments.

[0028] With the continuous development of the photovoltaic solar cell industry, the market demand for photovoltaic module power is increasing. How to improve the power of photovoltaic modules while reducing module costs has been a constant concern for researchers. Therefore, those skilled in the art have started with cell size, increasing module power by expanding the size of cells through segmented assembly. However, currently available conventional cells are simply segmented without optimizing the internal circuit design. As cell size increases, the cell current inevitably increases, leading to higher internal electrical losses in the photovoltaic module, which in turn results in lower module power. At the same time, multi-segment layout design presents challenges such as high manufacturing difficulty and high microcrack rate. All of these factors will affect the industrial application of multi-segment modules.

[0029] Therefore, this application provides a photovoltaic module that solves the technical problem in the prior art of increasing the number of cells to increase power, resulting in a significant increase in the module's Voc (open circuit voltage) and thus causing power loss in the solar cell module, and improves the power loss of hot spots in the solar cell module.

[0030] like Figure 1-4As shown, this application provides a photovoltaic module, including: two symmetrically arranged battery modules 100, which are electrically connected by an end busbar 200, a middle busbar 300, a first jumper busbar 400, and a second jumper busbar 500. The middle busbar 300 is disposed between the two battery modules 100, and the end busbars 200 are symmetrically arranged at the other end of the two battery modules 100 along the middle busbar 300. Each battery module 100 includes a first battery string unit 110, a second battery string unit 120, and a third battery string unit connected in series. Battery string unit 130; a first jumper bus 400 is disposed between the first battery string unit 110 and the second battery string unit 120, one end of the first jumper bus 400 is electrically connected to the end bus 200, and the other end is electrically connected to the middle bus 300 through the first junction box 600; a second jumper bus 500 is disposed between the second battery string unit 120 and the third battery string unit 130, one end of the second jumper bus 500 is electrically connected to the third battery string unit 130, and the other end is electrically connected to the middle bus 300 through the second junction box 700.

[0031] Specifically, the circuit in this embodiment is equipped with two jumper busbars. The first jumper busbar 400 adopts a shared busbar design. The jumper busbar and the middle busbar 300 are not directly connected, but are connected through two different junction boxes. This optimizes the current path of the entire module cell, reduces internal power loss, and thus reduces the power loss of the module caused by the significant increase in Voc while increasing the number of cells, thereby improving the power generation efficiency of the photovoltaic module.

[0032] The photovoltaic module includes two battery modules 100, which are connected by an end busbar 200, a middle busbar 300, a first jumper busbar 400, and a second jumper busbar 500. The two battery modules 100 can be arranged symmetrically, with adjacent electrodes of the two modules being identical. There are two end busbars 200, each located at one end of one of the two battery modules 100, and they are also symmetrically arranged. The middle busbar 300 is located between the two battery modules 100, and a first junction box 600 and a second junction box 700 are connected to it. Bent leads are provided at the connection points between the middle busbar 300 and the first and second junction boxes 600 and 700, respectively. These bent leads are soldered to the circuitry within the junction boxes to form a circuit. In addition, four connection points 800 are provided at the connection points with the first junction box 600 and the second junction box 700. These four connection points 800 are used to connect with the circuits of the first junction box 600 and the second junction box 700 to form a circuit. The four connection points 800 can be connected to the central busbar 300 and the jumper busbar respectively through the internal circuits of the first junction box 600 and the second junction box 700 to form the circuit of the photovoltaic module.

[0033] In the aforementioned photovoltaic module circuit, two jumper buses are configured: a first jumper bus 400 and a second jumper bus 500. The first jumper bus 400 adopts a shared bus design. The first jumper bus 400 can be disposed between the first battery string unit 110 and the second battery string unit 120, so that the first battery string unit 110 and the second battery string unit 120 share a single jumper bus.

[0034] In one embodiment, the battery module 100 may include three battery string units, namely a first battery string unit 110, a second battery string unit 120, and a third battery string unit 130, which are connected in series. Each battery string unit includes two battery cells connected in parallel. It should be noted that the electrodes of adjacent battery string units are opposite.

[0035] Three battery string units are arranged in parallel to each other, and two jumper busbars are respectively set between the three battery strings. Specifically, the first jumper busbar 400 is set between the first battery string unit 110 and the second battery string unit 120, and the second jumper busbar 500 is set between the second battery string unit 120 and the third battery string unit 130. The first battery string unit 110 and the second battery string unit 120 share one first jumper busbar 400.

[0036] The first junction box 600 is located at the intersection of the first jumper busbar 400 and the middle busbar 300. The first jumper busbar 400 and the middle busbar 300 are connected through the internal circuit of the first junction box 600. Four connection points 800 are provided at the connection between the first jumper busbar 400 and the middle busbar 300. The four connection points 800 are located inside the first junction box 600. Two connection points 800 are used to connect the first jumper busbars 400 of the two battery modules 100, and the other two connection points 800 are used to connect the middle busbar 300.

[0037] Inside the first junction box 600, there are two diodes, namely the first diode 610 and the second diode 620. The two diodes are symmetrically arranged on both sides of the first jumper bus 400, and there are two first jumper connection points (i.e., docking points 800) between the two diodes. The first jumper connection points are used to connect the first jumper bus 400 of the two battery modules 100.

[0038] Placing the first diode 610 and the second diode 620 on both sides of the first jumper bus 400 facilitates circuit connection, optimizes circuit layout, and allows the first diode 610 and the second diode 620 to be installed in a junction box, reducing the number of junction boxes.

[0039] The second junction box 700 is located at the intersection of the second jumper busbar 500 and the middle busbar 300. The second jumper busbar 500 and the middle busbar 300 are connected through the internal circuit of the second junction box 700. Four connection points 800 are also provided at the connection between the second jumper busbar 500 and the middle busbar 300. The four connection points 800 are located inside the second junction box 700. Two connection points 800 are used to connect the second jumper busbars 500 of the two battery modules 100, and the other two connection points 800 are used to connect the middle busbar 300.

[0040] The second junction box 700 contains a third diode 710. One end of the third diode 710 is connected to the central busbar 300, and the other end is connected to two second jumper connection points (i.e., docking points 800). These second jumper connection points are used to connect the second jumper busbars 500 of the two battery modules 100. It should be noted that, as... Figure 4 As shown, a lead is provided at one end of the third diode 710 connected to the middle busbar 300, and the lead is directly connected to the docking point 800 of the middle busbar 300.

[0041] Therefore, a complete circuit is formed on the photovoltaic module. The circuit is equipped with two jumper busbars, in which two diodes can be placed in the same junction box and connected in the same junction box. This optimizes the current path of the entire module cell, reduces internal power loss, and thus reduces the power loss of the module caused by the significant increase in Voc while increasing the number of cells, thereby improving the power generation efficiency of the photovoltaic module.

[0042] In this embodiment, the two jumper buses, namely the first jumper bus 400 and the second jumper bus 500, are not directly connected to the middle bus 300. Instead, they are connected indirectly through two junction boxes, which avoids the problem of reduced yield caused by complex bus soldering operations. Only two jumper buses are provided, one of which (i.e., the first jumper bus 400) is located between the first battery string unit 110 and the second battery string unit 120, so that the first battery string unit 110 and the second battery string unit 120 share a single jumper bus (i.e., the first jumper bus 400). The distance between the first diode 610 and the second diode 620 is set close enough so that the first diode 610 and the second diode 620 can be placed in the same junction box (i.e., within the first junction box 600), reducing the number of circuit junction boxes. The first battery string unit 110 and the second battery string unit 120 can be connected in series through the first junction box 600. The above measures optimize the current path in the battery circuit of the entire photovoltaic module, which can significantly reduce power loss and improve module efficiency.

[0043] In one embodiment, the first battery string unit 110, the second battery string unit 120, and the third battery string unit 130 each include two parallel battery strings, with adjacent battery string units having opposite electrodes. The two battery cells are identical in shape and size, both being uncut rectangular cells with a length of 158-230 mm and a width of 30-120 mm.

[0044] Specifically, three battery string units are arranged parallel to each other along the short side of the solar cells. The three battery strings comprise a total of six rectangular solar cells. Each battery string unit includes at least two battery strings, and each battery string is formed by multiple solar cells connected in series. The battery strings within a battery string unit are connected in parallel. The electrodes of two adjacent battery string units are opposite.

[0045] In one embodiment, the distance between adjacent battery string units is 0.5-8mm, and the distance between adjacent battery cells is -1-1.5mm, so that short circuits do not occur between adjacent battery cells or adjacent battery strings.

[0046] In one embodiment, bent lead wires are provided at the connection points of the first jumper busbar 400, the second jumper busbar 500 and the middle busbar 300, and the bent lead wires are electrically connected to the internal circuits of the first junction box 600 / second junction box 700.

[0047] The bent lead wire is designed to facilitate disassembly and maintenance between the central busbar 300 and the junction box, enabling replacement of the junction box, etc. The connection between the bent lead wire and the internal circuitry of the junction box can employ common connection methods, such as soldering. It should be noted that the bent lead wire can be positioned outside the junction box for ease of operation.

[0048] In one embodiment, both the first jumper bus 400 and the second jumper bus 500 are conductive metal strips with a width of 2-10 mm and a thickness of 0.1-0.5 mm, to ensure that the conductivity of the first jumper bus 400 and the second jumper bus 500 meets the requirements.

[0049] In one embodiment, an insulating material is provided at the electrical connection between the second jumper busbar 500 and the third battery string unit 130. The thickness of the insulating material can be set to 0.03-0.5 mm, and the width of the insulating material can be set to be greater than or equal to the width of the second jumper busbar. Providing insulating material at the electrical connection between the second jumper busbar 500 and the third battery string unit 130 effectively prevents short-circuit failures and further improves circuit reliability. The insulating material can be a material with good insulating properties, such as rubber.

[0050] This application provides a photovoltaic module, including: two symmetrically arranged battery modules 100, which are electrically connected by an end busbar 200, a middle busbar 300, a first jumper busbar 400, and a second jumper busbar 500. The middle busbar 300 is disposed between the two battery modules 100, and the end busbars 200 are symmetrically arranged at the other ends of the two battery modules 100 along the middle busbar 300. Each battery module 100 includes a first battery string unit 110, a second battery string unit 120, and a third battery string connected in series. Unit 130; A first jumper bus 400 is disposed between the first battery string unit 110 and the second battery string unit 120. One end of the first jumper bus 400 is electrically connected to the end bus 200, and the other end is electrically connected to the middle bus 300 through the first junction box 600; A second jumper bus 500 is disposed between the second battery string unit 120 and the third battery string unit 130. One end of the second jumper bus 500 is electrically connected to the third battery string unit 130, and the other end is electrically connected to the middle bus 300 through the second junction box 700.

[0051] In this embodiment, two jumper buses are provided, namely, the first jumper bus 400 and the second jumper bus 500 are not directly connected to the middle bus 300, but are connected indirectly through two junction boxes, which avoids the problem of reduced yield caused by complex bus soldering operations. Only two jumper buses are provided, one of which (i.e., the first jumper bus 400) is located between the first battery string unit 110 and the second battery string unit 120, so that the first battery string unit 110 and the second battery string unit 120 share a single jumper bus (i.e., the first jumper bus 400). The distance between the first diode 610 and the second diode 620 is set close enough so that the first diode 610 and the second diode 620 can be placed in the same junction box (i.e., within the first junction box 600), reducing the number of circuit junction boxes. The first battery string unit 110 and the second battery string unit 120 can be connected in series through the first junction box 600. The above measures optimize the current path in the battery circuit of the entire photovoltaic module, which can significantly reduce power loss and improve module efficiency.

[0052] In summary, the circuit of this embodiment has two jumper busbars and adopts a shared busbar design. The jumper busbars are not directly connected to the central busbar 300, avoiding the problem of reduced yield caused by complex busbar soldering operations. The two diodes can be placed in the same junction box and connected in the same junction box, which optimizes the current path of the entire module cell and reduces internal power loss. This reduces the power loss of the module due to the significant increase in Voc while increasing the number of cells, thereby improving the power generation efficiency of the photovoltaic module.

[0053] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A photovoltaic module, characterized in that, include: Two battery modules are symmetrically arranged and electrically connected by an end busbar, a middle busbar, a first jumper busbar, and a second jumper busbar. The middle busbar is located between the two battery modules, and the end busbars are symmetrically arranged at the other end of the two battery modules along the middle busbar. The battery module includes a first battery string unit, a second battery string unit, and a third battery string unit connected in series. The first jumper busbar is disposed between the first battery string unit and the second battery string unit. One end of the first jumper busbar is electrically connected to the end busbar, and the other end is electrically connected to the middle busbar through the first junction box. The second jumper bus is disposed between the second battery string unit and the third battery string unit. One end of the second jumper bus is electrically connected to the third battery string unit, and the other end is electrically connected to the middle bus through the second junction box.

2. The photovoltaic module according to claim 1, characterized in that, The first battery string unit and the second battery string unit share the same first jumper busbar for electrical connection.

3. The photovoltaic module according to claim 1 or 2, characterized in that, The first battery string unit, the second battery string unit, and the third battery string unit each include two battery strings connected in parallel, and the electrodes of adjacent battery string units are opposite.

4. The photovoltaic module according to claim 3, characterized in that, The length of the battery cell is 158-230mm, and the width of the battery cell is 30-120mm.

5. The photovoltaic module according to claim 3, characterized in that, The distance between adjacent battery string units is 0.5-8mm, and the distance between adjacent battery cells is -1-1.5mm.

6. The photovoltaic module according to claim 1, characterized in that, The first jumper busbar, the second jumper busbar, and the middle busbar are all provided with bent lead wires at their connection points, and the bent lead wires are electrically connected to the circuit inside the first junction box / second junction box.

7. The photovoltaic module according to claim 1, characterized in that, Both the first jumper busbar and the second jumper busbar are conductive metal strips with a width of 2-10 mm and a thickness of 0.1-0.5 mm.

8. The photovoltaic module according to claim 1, characterized in that, An insulating material is provided at the electrical connection between the second jumper bus and the third battery string unit. The thickness of the insulating material is 0.03-0.5 mm, and the width of the insulating material is greater than or equal to the width of the second jumper bus.

9. The photovoltaic module according to claim 1, characterized in that, The first junction box contains two diodes, which are symmetrically arranged on both sides of the first jumper busbar, and there is a first jumper connection point between the two diodes. The first jumper connection point is used to connect the first jumper busbar of the two battery modules.

10. The photovoltaic module according to claim 1, characterized in that, A third diode is provided inside the second junction box. One end of the third diode is connected to the central busbar, and the other end is connected to the second jumper connection point. The second jumper connection point is used to connect the second jumper busbars of the two battery modules.

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