Photovoltaic module

Abstract

The invention discloses a photovoltaic module which comprises a first upper battery string group, a second upper battery string group, a first lower battery string group and a second lower battery string group. The first upper battery string group and the first lower battery string group are connected in parallel through a first middle bus bar, and the second upper battery string group and the second lower battery string group are connected in parallel through a second middle bus bar. The first upper battery string group and the second upper battery string group are connected in series through a first upper bus bar, the first lower battery string group and the second lower battery string group are connected in series through a first lower bus bar, and the first upper bus bar and the first lower bus bar are electrically connected through a first jumper wire. A first isolating bar is arranged between the first jumper wire and the battery string group, and the first leading-out end of the first middle bus bar and the second leading-out end of the second middle bus bar are both in lap joint with the top face of the first isolating bar or abut against the two opposite side faces of the first isolating bar respectively. The structure can limit free movement of the first isolating bar, the first middle bus bar and the second middle bus bar.

Description

[0001] This application is a divisional application, the original application number is 202110737366.7, the original application date is June 30, 2021, and the entire contents of the original application are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of photovoltaic power generation, in particular to a photovoltaic module. BACKGROUND

[0003] With the continuous development of photovoltaic power generation technology, photovoltaic modules have been gradually applied to various fields of social life and are favored by users.

[0004] The photovoltaic module in the prior art includes an upper cell string group and a lower cell string group, the upper cell string group and the lower cell string group are electrically connected through a jumper, the jumper is usually a conductor formed by using a conductive material, when the jumper overlaps with a cell array, an interconnecting strip for electrically connecting the cells is easy to overlap with the jumper, if the two directly contact, it will cause electrical connection, thereby affecting the normal work of the photovoltaic module. Therefore, an insulating strip is arranged between the jumper and the cell array, and the insulating strip may be offset in daily use, thereby causing short circuit or blocking the cell surface. SUMMARY

[0005] The purpose of the present application is to provide a photovoltaic module to solve the technical problem that the bus bar and the insulating strip are easy to offset in the prior art.

[0006] The present application provides a photovoltaic module, comprising a first upper cell string group, a second upper cell string group, a first lower cell string group and a second lower cell string group; the first upper cell string group and the first lower cell string group are connected in parallel through a first intermediate bus bar, and the second upper cell string group and the second lower cell string group are connected in parallel through a second intermediate bus bar; the first upper cell string group and the second upper cell string group are connected in series through a first upper bus bar, the first lower cell string group and the second lower cell string group are connected in series through a first lower bus bar, and the first upper bus bar and the first lower bus bar are electrically connected through a first jumper; wherein the first intermediate bus bar is provided with a first lead-out end, the second intermediate bus bar is provided with a second lead-out end, and the first lead-out end and the second lead-out end are located on opposite sides of the first jumper; a first isolation strip is arranged between the first jumper and the cell string group, and the first lead-out end and the second lead-out end are respectively overlapped on the top surface of the first isolation strip or abut against the opposite side surfaces of the first isolation strip.

[0007] In a possible design, the first isolation strip comprises a middle layer, an upper layer and a lower layer, the middle layer is made of an insulating material, and the upper layer and the lower layer are made of a material with adhesion.

[0008] In a possible design, the first jumper wire is electrically connected with a first L-shaped lead-out wire, one side of the first L-shaped lead-out wire is connected with the first jumper wire, and the other side extends away from the plane where the battery string group is located.

[0009] In a possible design, the first jumper wire includes a first sub-portion and a second sub-portion, and the second sub-portion partially overlaps the first sub-portion; the second sub-portion is provided with a third lead-out end, the third lead-out end extends away from the plane where the battery string group is located, and the bottom of the third lead-out end is lapped on the first sub-portion.

[0010] In a possible design, the first lead-out end is formed by folding an end of the first intermediate bus bar, and the second lead-out end is formed by folding an end of the second intermediate bus bar. The distance between the bending part of at least one of the first lead-out end and the second lead-out end and the edge of the first jumper wire is 3 mm-5 mm.

[0011] In a possible design, the photovoltaic module further includes a third upper battery string group and a third lower battery string group; the third upper battery string group and the third lower battery string group are connected in parallel through a third intermediate bus bar; the third upper battery string group and the third lower battery string group are further electrically connected through a second jumper wire, and the second jumper wire is electrically connected with the second intermediate bus bar.

[0012] In a possible design, the third intermediate bus bar is provided with a fourth lead-out end; the second intermediate bus bar is electrically connected with a second L-shaped lead-out wire, one side of the second L-shaped lead-out wire is connected with the second intermediate bus bar, and the other side extends away from the plane where the battery string group is located; the second jumper wire is arranged on the second intermediate bus bar and located between the second L-shaped lead-out wire and the fourth lead-out end.

[0013] In a possible design, the third intermediate bus bar is provided with a fourth lead-out end; the second intermediate bus is provided with a fifth lead-out end, the fifth lead-out end is located between the second jumper wire and the fourth lead-out end, and the second jumper wire is arranged on the second intermediate bus bar.

[0014] In a possible design, the third intermediate bus bar is provided with a fourth lead-out end; the second intermediate bus bar is provided with a sixth lead-out end, and the second jumper wire is arranged between the sixth lead-out end and the fourth lead-out end.

[0015] In a possible design, the photovoltaic module further includes a second isolation strip, and the second isolation strip is arranged between the second jumper wire and the battery string group.

[0016] In one possible design, the first upper battery string group, the second upper battery string group, the first lower battery string group, the second lower battery string group, the third upper battery string group, and the third lower battery string group each include multiple battery strings connected in parallel.

[0017] In one possible design, the photovoltaic module further includes a dual diode junction box, which is provided with a pad, two electrical connection pieces and two diodes. The two electrical connection pieces are respectively straddled across the corresponding diodes. The first jumper and the two diodes are electrically connected to the pad. One of the two diodes is electrically connected to the first lead through one of the electrical connection pieces, and the other is electrically connected to the second lead through the other electrical connection piece.

[0018] The present invention utilizes the first lead-out end of the first intermediate bus bar and the second lead-out end of the second intermediate bus bar. The bends of the first lead-out end and the second lead-out end clamp or press the first isolation strip where the first jumper is located, thereby restricting the free movement of the first jumper, the first intermediate bus bar and the second intermediate bus bar from causing short circuits or blocking the battery surface. Attached Figure Description

[0019] Appendix Figure 1 This is the circuit layout diagram of the present invention; Appendix Figure 2 This is a rear view of the internal connection at the middle position of Embodiment 1 of the present invention; Appendix Figure 3 This is a cross-sectional view of the middle position of Embodiment 1 of the present invention; Appendix Figure 4 This is a partial isometric view of Embodiment 1 of the present invention. Figure 1 ; Appendix Figure 5 This is a partial isometric view of Embodiment 1 of the present invention. Figure 2 ; Appendix Figure 6 This is a rear view of the internal connection at the middle position of Embodiment 2 of the present invention; Appendix Figure 7 This is a cross-sectional view of the middle position of Embodiment 2 of the present invention; Appendix Figure 8 This is a partial isometric view of Embodiment 2 of the present invention. Figure 1 ; Appendix Figure 9 This is a partial isometric view of Embodiment 2 of the present invention. Figure 2 ; Appendix Figure 10 This is a partial isometric view of Embodiment 3 of the present invention. Figure 1 ; Appendix Figure 11 This is a partial isometric view of Embodiment 3 of the present invention. Figure 2 ; Appendix Figure 12 This is a top view of the dual diode junction box of the present invention; Appendix Figure 13 This is a cross-sectional view of the dual diode junction box of the present invention.

[0020] Explanation of reference numerals in the attached figures: 100 - Upper battery unit, 101 - First upper battery string group, 102 - Second upper battery string group, 103 - Third upper battery string group; 200 - Lower battery unit, 201 - First lower battery string, 202 - Second lower battery string, 203 - Third lower battery string; 301 - First upper busbar, 302 - First lower busbar, 303 - First intermediate busbar, 304 - Second intermediate busbar, 305 - Third intermediate busbar; 401 - First pin, 402 - Second pin, 403 - Third pin, 404 - Fourth pin, 405 - Fifth pin, 406 - Sixth pin; 501 - First jumper, 5011 - First sub-section, 5022 - Second sub-section, 502 - Second jumper; 601 - First L-shaped lead-out, 602 - Second L-shaped lead-out; 701 - First isolation strip; 702 - Second isolation strip; 800-Place Block; 900 - Dual diode junction box, 901 - Box body, 902 - Electrical connection piece, 903 - Solder pad, 904 - Diode, 905 - First hole, 906 - Second hole, 907 - Third hole. Detailed Implementation

[0021] The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] Example 1 like Figure 1 As shown, an embodiment of the present invention provides a photovoltaic module, including an upper battery cell 100 and a lower battery cell 200 connected in parallel, wherein: The upper battery unit 100 includes a first upper battery string group 101 and a second upper battery string group 102. The adjacent battery strings in the first upper battery string group 101 and the second upper battery string group 102 have opposite polarities and are connected in series through a first upper busbar 301. The lower battery unit 200 includes a first lower battery string group 201 and a second lower battery string group 202. The adjacent battery strings in the first lower battery string group 201 and the second lower battery string group 202 have opposite polarities and are connected in series through a first lower busbar 302. Each of the first upper battery string group 101, the second upper battery string group 102, the first lower battery string group 201, and the second lower battery string group 202 includes a plurality of battery strings. When the number of battery strings is greater than or equal to 2, the battery strings are connected in parallel. Each battery string includes a plurality of battery cells connected in series.

[0023] In this embodiment, conventionally sized solar cells (156-210mm) are laser-cut into four independent cells of the same specifications. Each cell has a positive electrode and a back electrode, and the positions of each positive electrode and back electrode overlap. The cut cells are connected in series with interconnecting strips to form a battery string. In this embodiment, the first upper battery string group 101, the second upper battery string group 102, the first lower battery string group 201, and the second lower battery string group 202 each include two parallel battery strings.

[0024] A first intermediate busbar 303 is connected between the first upper battery string group 101 and the first lower battery string group 201. The first upper battery string group 101 and the first lower battery string group 201 are connected in parallel through the first intermediate busbar 303, and the battery cells at the connection point have the same polarity. The end of the first intermediate busbar 303 is provided with a first lead-out end 401.

[0025] A second intermediate busbar 304 is connected between the second upper battery string group 102 and the second lower battery string group 202. The second upper battery string group 102 and the second lower battery string group 202 are connected in parallel through the second intermediate busbar 304, and the battery cells at the connection point have the same polarity. The end of the second intermediate busbar 304 is provided with a second lead-out end 402.

[0026] By introducing parallel circuits, the number of batteries connected in series and parallel is increased, which can reduce series resistance loss by 15W and is expected to increase the module power by at least three levels. At the same time, the increase in the number of parallel circuits also reduces the overall series resistance of the module, thereby reducing power loss.

[0027] It should be noted that the intermediate position of the first intermediate busbar 303 and the second intermediate busbar 304 does not refer to the exact center, but also includes the area near the center.

[0028] The first upper busbar 301 and the first lower busbar 302 are electrically connected via a first jumper 501. The first jumper 501 can be disposed on the solar cell, and a first insulating strip 701 is provided between the first jumper 501 and the solar cell; the first insulating strip 701 provides insulation. This also reduces the width of the photovoltaic module, thereby reducing the amount of auxiliary materials such as backsheets and encapsulants, and reducing material costs.

[0029] The first jumper 501 addresses the risk of breakdown caused by excessively high voltage across a single junction box diode, as mentioned later in the bypass bridging section. It does not carry current during normal module operation and is only used to carry current when hot spots appear on the module or when diodes inside the junction box are operating.

[0030] The first insulating strip 701 is preferably a multi-layered structure, including a middle layer, an upper layer, and a lower layer. The upper and lower layers are located on the upper and lower surfaces of the middle layer, respectively. The middle layer is an insulating material, and the upper and lower layers are materials with certain adhesive properties. The first insulating strip 701 is bonded to the metal strip by the adhesive materials of the upper and lower layers. This adhesive material can be pressure-sensitive or heat-sensitive. The thickness of the upper and lower layers is not less than 0.1 mm to ensure a certain degree of adhesion. The overall thickness of the first insulating strip 701 is between 0.32 and 0.5 mm to avoid crushing the battery cells due to excessive thickness.

[0031] In this embodiment, the first jumper 501 uses a wide, thin metal strip with a thickness not exceeding 0.3 mm, for example, 3 mm. 0.2mm, 3 0.25mm, 4 0.2mm, 4 0.25mm, 5 0.2mm, 5 0.15mm, 6 0.2mm, 6 With a thickness of 0.15mm, this type of metal strip has increased width during the lamination process, giving it a certain strength in the lateral direction and making it less prone to bending. This solves the offset problem that exists in the actual manufacturing process, reduces the difficulty of the manufacturing process, and the thinner size also avoids problems such as squeezing and generating air bubbles in the battery cells during the lamination process.

[0032] The first jumper 501 and the first isolation strip 701 are positioned by fixing tape or pre-welding. The edge of the first isolation strip 701 is not less than 2mm away from the edge of the first jumper 501 to prevent the first jumper 501 from shifting and exposing the contact cell.

[0033] The first lead-out end 401 and the second lead-out end 402 can be formed by folding the first intermediate busbar 303 and the second intermediate busbar 304. The first lead-out end 401 and the second lead-out end 402 are located on opposite sides of the first jumper 501. The distance between the bend of the first lead-out end 401 and the edge of the second lead-out end 402 and the edge of the first jumper 501 is limited to 3mm-5mm to avoid bridging and short circuits. The proximity of the bends of the first lead-out end 401 and the second lead-out end 402 to each other helps to reduce the design length of the junction box. The first lead-out end 401 and the second lead-out end 402 abut against opposite sides of the first isolation strip 701 or both overlap the top surface of the first isolation strip 701. This can limit the free movement of the first isolation strip 701, the first intermediate busbar 303 and the second intermediate busbar 304 to prevent short circuits or obstruction of the battery surface.

[0034] Furthermore, the first isolation strip 701 is designed to be double-sided adhesive, effectively fixing the position of the first lead 401 and the second lead 402 at the bend, preventing them from shifting and avoiding the problem of diode short circuit caused by shifting; in addition, the double-sided adhesive nature of the first isolation strip 701 also serves to limit the position of its adjacent battery strings, preventing the battery strings from overlapping due to the close spacing between the strings.

[0035] Furthermore, the upper battery unit 100 also includes a third upper battery string group 103, wherein the adjacent battery strings of the third upper battery string group 103 and the second upper battery string group 102 have the same polarity. The lower battery unit 200 also includes a third lower battery string group 203, wherein the adjacent battery strings of the third lower battery string group 203 and the second lower battery string group 202 have the same polarity. A third intermediate bus bar 305 connects the third upper battery string group 103 and the third lower battery string group 203. The third upper battery string group 103 and the third lower battery string group 203 are connected in parallel through the third intermediate bus bar 305, and the battery cells at the connection point have the same polarity.

[0036] The third upper battery string group 103 and the third lower battery string group 203 are electrically connected via a second jumper 502. The second jumper 502 is electrically connected to the second intermediate busbar 304. A second isolation strip 702 is also provided between the second jumper and the battery cell. The structure and function of the second isolation strip 702 can refer to the structure and function of the first isolation strip mentioned above. The second intermediate busbar 304 and the third intermediate busbar 305 are electrically connected to a diode. The second jumper 502 is used to transmit current when the photovoltaic module is operating normally. This also reduces the width of the photovoltaic module, thereby reducing the amount of auxiliary materials such as backsheets and encapsulants used, and reducing material costs.

[0037] In this embodiment, the second jumper 502 uses a wide, thin metal strip with a thickness not exceeding 0.3 mm, for example, 3 mm. 0.2mm, 3 0.25mm, 4 0.2mm, 4 0.25mm, 5 0.2mm, 5 0.15mm, 6 0.2mm, 6 With a thickness of 0.15mm, this type of metal strip has increased width during the lamination process, giving it a certain strength in the lateral direction and making it less prone to bending. This solves the offset problem that exists in the actual manufacturing process, reduces the difficulty of the manufacturing process, and the thinner size also avoids problems such as squeezing and generating air bubbles in the battery cells during the lamination process.

[0038] In this embodiment, the first jumper 501 is electrically connected to a first L-shaped lead 601. One side of the first L-shaped lead 601 is attached to the first jumper 501, and the other side of the first L-shaped lead 601 extends in a direction away from the plane where the battery cell is located. It can be perpendicular to the plane where the battery cell is located or it can maintain a set angle. Maintaining perpendicularity is suitable for resistance welding, and if it needs to be bent, it is suitable for soldering.

[0039] The first L-shaped lead 601 is the dielectric material connecting the first jumper 501 to the diode in the dual diode junction box 900 mentioned later. This configuration is simple to implement and reduces the number of connecting wires, which is beneficial for simplifying the structure and connection process of photovoltaic modules. The first L-shaped lead 601, the first lead end 401, and the second lead end 402 can extend perpendicularly to the plane where the solar cell is located. Alternatively, they can extend at an angle relative to the plane where the solar cell is located, meaning the angle between the first L-shaped lead 601, the first lead end 401, and the second lead end 402 and the plane where the solar cell is located does not have to be 90°, as long as the first L-shaped lead 601, the first lead end 401, and the second lead end 402 are parallel to each other.

[0040] The first L-shaped lead 601, the first lead 401, and the second lead 402 are electrically connected through a dual diode junction box 900. The dual diode junction box 900 includes a box body 901, which contains a pad 903, an electrical connection piece 902, and a diode 904. There are two electrical connection pieces 902 and two diodes 904. Each diode 904 corresponds to one electrical connection piece 902. One end of the diode 904 is electrically connected to the corresponding electrical connection piece 902, and the other end of the diode 904 is electrically connected to the pad 903. The electrical connection piece 902 is positioned above the diode 904.

[0041] One of the electrical connectors 902 has a first hole 905, which is used for the first lead 401 to pass through and be electrically connected to the corresponding electrical connector 902; the other electrical connector 902 has a second hole 906, which is used for the second lead 402 to pass through and be electrically connected to the corresponding electrical connector 902; the pad 903 has a third hole 907, which is used for the first L-shaped lead 601 to pass through and be electrically connected to the pad 903.

[0042] Each upper and lower battery string is connected to a diode, enabling bypass functionality when the battery string is shaded, thus preventing overheating and damage to the module. Furthermore, two diodes 904 are installed within the housing 901 of the dual-diode junction box 900. The first intermediate busbar 303 and the second intermediate busbar 304 are electrically connected to one of the diodes 904, effectively solving the technical problem of complex photovoltaic module lead-out wiring (avoiding the need for jumper wires inside the photovoltaic module) and preventing reliability issues caused by jumper wires.

[0043] Furthermore, by placing the electrical connecting pieces 902 across the corresponding diodes 904, the width of the junction box 901 is kept narrow, thereby reducing shading of the photovoltaic modules and improving power generation efficiency. On the other hand, the electrical connecting pieces 902 can fit closely to the outer shell of the diodes 904 and the contact area is increased, which is beneficial for the heat dissipation of the diodes.

[0044] Furthermore, a second L-shaped lead 602 is electrically connected to the second intermediate busbar 304. The horizontal section of the second L-shaped lead 602 is in close contact with the second intermediate busbar 304, and the vertical section of the second L-shaped lead 602 is perpendicular to the plane where the battery cell is located. The end of the third intermediate busbar 305 is bent in a direction away from the plane where the battery cell is located to form a fourth lead 404. The second L-shaped lead 602 and the fourth lead 404 are electrically connected through a single diode junction box. The structure of the single diode junction box can refer to the junction box structure in the prior art, and will not be described in detail here.

[0045] The second L-shaped lead 602 serves as the dielectric connecting the second jumper 502 to the diode in the single-diode junction box. This design is simple to implement and reduces the number of connecting wires, thus simplifying the structure and connection process of the photovoltaic module. The second L-shaped lead 602 and the fourth lead 404 can extend perpendicularly to the plane of the solar cell. Alternatively, they can extend at an angle relative to the plane of the solar cell; that is, the angle between the second L-shaped lead 602, the fourth lead 404, and the plane of the solar cell does not need to be 90°, as long as the second L-shaped lead 602 and the fourth lead 404 are parallel to each other.

[0046] The second jumper 502 spans across the second intermediate busbar 304 and is located between the second L-shaped lead 602 and the fourth lead 404. The second jumper 502 is directly soldered to the second intermediate busbar 304 for electrical connection. By using the second L-shaped lead 602, short circuits caused by the two leads being too close can be avoided. The second insulating strip 702 can also be segmented to prevent excessive thickness at the lead ends, which could lead to air bubbles and microcracks in the solar cells during lamination. The second L-shaped lead 602 and the fourth lead 404 are electrically connected via a single diode junction box.

[0047] Example 2 In this embodiment, the first jumper 501 and the second jumper 502 are both located between the battery strings. The distance between the two battery strings is large, so there is no need to add an isolation strip. The arrangement of the first intermediate bus bar 303, the second intermediate bus bar 304 and the first jumper 501 is the same as in Embodiment 1. The difference is the arrangement of the second jumper 502, the second intermediate bus bar 304 and the third intermediate bus bar 305.

[0048] Specifically, the end of the second intermediate busbar 304 is bent away from the plane where the battery cell is located to form a fifth lead-out end 405. The fifth lead-out end 405 is located between the second jumper 502 and the fourth lead-out end 404. The second jumper 502 is soldered to the second intermediate busbar 304 and is positioned close to the fifth lead-out end 405. This effectively fixes the second intermediate busbar 304, preventing it from deviating and causing a short circuit or obstructing the battery surface.

[0049] Example 3 In this embodiment, the first jumper 501 includes a first sub-part 5011 and a second sub-part 5022. The second sub-part 5022 partially overlaps with the first sub-part 5011. The end of the second sub-part 5022 is bent away from the plane of the battery cell to form a third lead-out end 403, which overlaps the first sub-part 5011. In this embodiment, the first sub-part 5011 and the second sub-part 5022 can be integrally formed for ease of manufacturing. The first sub-part 5011 can also be a separate structure, achieved through pre-welding, with the overlapping area of ​​the two metal strips not less than 4×4mm. By setting the first jumper 501 as two sub-parts, the first L-shaped lead-out wire 601 can be eliminated, making machine welding easier.

[0050] The end of the second intermediate busbar 304 is bent away from the plane where the battery cell is located to form a sixth lead 406. The second jumper 502 is located between the sixth lead 406 and the fourth lead 404, and is close to the sixth lead 406. Both the second jumper 502 and the sixth lead 406 are adhered and fixed to the pad 800. The pad 800 is located on the plane where the battery cell is located. The pad 800 is double-sided adhesive, which effectively fixes the position of the bent part of the sixth lead 406 and the second jumper 502, preventing them from shifting and avoiding the problem of diode short circuit caused by shifting. By setting the pad 800, it serves to connect the second jumper 502 and the second intermediate busbar 304, thus eliminating the need for the second L-shaped lead 602 and making it easier to perform machine soldering. According to the above embodiments, further, the distance between the bend of the first intermediate busbar 303, the second intermediate busbar 304, or the third intermediate busbar 305 and the nearest battery main grid welding wire is not less than 2mm. This is to avoid the welding head being unable to weld the battery main grid welding wire due to space limitations.

[0051] The present invention also provides a lead wiring method for photovoltaic modules, comprising: The main circuit of the photovoltaic module is formed, and the main circuit includes at least one battery cell group, the battery cell group including an upper battery cell 100 and a lower battery cell 200 connected in parallel. The upper battery unit 100 includes a first upper battery string group 101, a second upper battery string group 102 and a third upper battery string group 103. The first upper battery string group 101 and the second upper battery string group 102 are connected in series through a first upper bus bar 301. The lower battery unit 200 includes a first lower battery string group 201, a second lower battery string group 202 and a third lower battery string group 203. The first lower battery string group 201 and the second lower battery string group 202 are connected in series through a first lower bus bar 302. The first upper battery string group 101, the second upper battery string group 102, the third upper battery string group 103, the first lower battery string group 201, the second lower battery string group 202 and the third lower battery string group 203 each include a plurality of battery strings. When the number of battery strings is greater than or equal to 2, the battery strings are connected in parallel. The battery string includes several battery cells connected in series. A first intermediate busbar 303 is connected between the first upper battery string group 101 and the first lower battery string group 201, and the end of the first intermediate busbar 303 is provided with a first lead-out end 401. A second intermediate busbar 304 is connected between the second upper battery string group 102 and the second lower battery string group 202, and the end of the second intermediate busbar 304 is provided with a second lead-out end 402. A third intermediate busbar 305 is connected between the third upper battery string group 103 and the third lower battery string group 203; The first upper busbar 301 and the first lower busbar 302 are electrically connected by a first jumper 501. The first jumper 501 is disposed on the battery cell, and a first isolation strip 701 is provided between the first jumper 501 and the battery cell. The third upper battery string group 103 and the third lower battery string group 203 are electrically connected via a second jumper 502. The first lead-out end 401 and the second lead-out end 402 are located on opposite sides of the first jumper 501. The first lead-out end 401 and the second lead-out end 402 abut against opposite sides of the first isolation strip 701 or both overlap the top surface of the first isolation strip 701.

[0052] The above description, based on the embodiments shown in the figures, details the structure, features, and effects of the present invention. The above description is only a preferred embodiment of the present invention, but the present invention is not limited to the scope of implementation shown in the figures. Any changes made in accordance with the concept of the present invention, or equivalent embodiments modified to have equivalent changes, that do not exceed the spirit covered by the specification and figures, should be within the protection scope of the present invention.

Claims

1. A photovoltaic module, characterized in that, It includes a first upper battery string group, a second upper battery string group, a first lower battery string group, and a second lower battery string group; The first upper battery string group and the first lower battery string group are connected in parallel through a first intermediate bus bar, and the second upper battery string group and the second lower battery string group are connected in parallel through a second intermediate bus bar; The first upper battery string group and the second upper battery string group are connected in series through the first upper bus bar, the first lower battery string group and the second lower battery string group are connected in series through the first lower bus bar, and the first upper bus bar and the first lower bus bar are electrically connected through the first jumper. The first intermediate busbar is provided with a first lead-out end, and the second intermediate busbar is provided with a second lead-out end. The first lead-out end and the second lead-out end are located on opposite sides of the first jumper. A first isolation strip is provided between the first jumper and the battery string group. The first lead and the second lead are both attached to the top surface of the first isolation strip or abut against the opposite sides of the first isolation strip.

2. The photovoltaic module according to claim 1, characterized in that, The first insulating strip includes an intermediate layer, an upper layer, and a lower layer, wherein the intermediate layer is made of an insulating material, and the upper and lower layers are made of an adhesive material.

3. The photovoltaic module according to claim 1, characterized in that, The first jumper is electrically connected to a first L-shaped lead, one side of which is connected to the first jumper, and the other side extends in a direction away from the plane where the battery string is located.

4. The photovoltaic module according to claim 1, characterized in that, The first jumper includes a first sub-section and a second sub-section, wherein the second sub-section partially overlaps with the first sub-section; The second sub-section is provided with a third lead-out end, which extends in a direction away from the plane where the battery string is located, and the bottom of the third lead-out end overlaps the first sub-section.

5. The photovoltaic module according to claim 1, characterized in that, The first lead-out end is formed by folding down the end of the first intermediate busbar, and the second lead-out end is formed by folding down the end of the second intermediate busbar; The distance between the bend of at least one of the first lead-out end and the second lead-out end and the edge of the first jumper wire is 3mm-5mm.

6. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module also includes a third upper battery string and a third lower battery string; The third upper battery string group and the third lower battery string group are connected in parallel through a third intermediate bus bar; The third upper battery string group and the third lower battery string group are also electrically connected via a second jumper, and the second jumper is electrically connected to the second intermediate bus bar.

7. The photovoltaic module according to claim 6, characterized in that, The third intermediate busbar is provided with a fourth lead-out end; The second intermediate busbar is electrically connected to a second L-shaped lead. One side of the second L-shaped lead is connected to the second intermediate busbar, and the other side extends in a direction away from the plane where the battery string is located. The second jumper is straddled across the second intermediate busbar and is located between the second L-shaped lead and the fourth lead.

8. The photovoltaic module according to claim 6, characterized in that, The third intermediate busbar is provided with a fourth lead-out end; The second intermediate busbar is provided with a fifth lead-out end, which is located between the second jumper and the fourth lead-out end, and the second jumper is straddling the second intermediate busbar.

9. The photovoltaic module according to claim 6, characterized in that, The third intermediate busbar is provided with a fourth lead-out end; The second intermediate busbar is provided with a sixth lead-out terminal, and the second jumper is located between the sixth lead-out terminal and the fourth lead-out terminal.

10. The photovoltaic module according to claim 6, characterized in that, The photovoltaic module also includes a second isolation strip, which is disposed between the second jumper and the battery string.

11. The photovoltaic module according to claim 6, characterized in that, The first upper battery string group, the second upper battery string group, the first lower battery string group, the second lower battery string group, the third upper battery string group, and the third lower battery string group each include multiple battery strings connected in parallel.

12. The photovoltaic module according to claim 1, characterized in that, The photovoltaic module also includes a dual diode junction box, which is provided with a pad, two electrical connection pieces and two diodes. The two electrical connection pieces are respectively straddled on the corresponding diodes. The first jumper and the two diodes are electrically connected to the pad. One of the two diodes is electrically connected to the first lead via one of the electrical connectors, and the other is electrically connected to the second lead via the other of the electrical connectors.

Images