Photovoltaic module

Abstract

This invention discloses a photovoltaic module. Within the same cell unit group of the photovoltaic module, the first connection points of two first cell strings and the second connection points of two second cell strings are electrically connected via jumpers. Any first cell string and second cell string with a common endpoint are connected in reverse parallel to the same diode via different sub-parts of the jumper. A central busbar connects the first and second cell units. The central busbar includes at least one partition region located between two common endpoints in the cell unit group. The ends of two adjacent sub-central busbars are both second leads, and the two second leads of two adjacent sub-central busbars are parallel to each other, with each second lead perpendicular to each first lead. According to the photovoltaic module of this invention, the number of cells in the photovoltaic module is increased while ensuring that the diode is not reverse-biased, thereby improving the performance of the photovoltaic module.

Description

[0001] This case is a divisional application of application number 201911228965.5, application date December 4, 2019, entitled "A photovoltaic module and its preparation method". Technical Field

[0002] This invention relates to the field of photovoltaic power generation, and in particular to a photovoltaic module. Background Technology

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

[0004] Figure 1 This is a circuit diagram of a photovoltaic module in existing technology. For example... Figure 1 As shown, existing photovoltaic modules include 12 cell strings 1, with every two cell strings 1 forming a series structure 2, and every two series structures 2 forming a parallel structure 3. The parallel structures 3 are connected in series. Furthermore, every two series structures 2 forming a parallel structure 3 are connected in reverse parallel to the same diode 4. The number of cells 5 protected by each diode 4 is the same as the number of cells 5 in the series structure 2, i.e., the total number of cells 5 in the two cell strings 1. Therefore, the number of cells 5 in the cell string 1 is limited by the reverse voltage withstand capability of the diode 4, preventing an increase in the total number of cells 5 in the photovoltaic module and affecting the improvement of photovoltaic module performance. Summary of the Invention

[0005] This invention provides a photovoltaic module that increases the number of solar cells in the photovoltaic module while ensuring that the diodes are not reverse-broken, thereby improving the performance of the photovoltaic module.

[0006] A photovoltaic module according to an embodiment of the present invention includes: at least one battery cell group, the battery cell group including a first battery cell and a second battery cell, the first battery cell and the second battery cell being connected in parallel, the first battery cell including two first battery strings being connected in series, the second battery cell including two second battery strings being connected in series, both the first battery strings and the second battery strings including multiple battery cells being connected in series, in the same battery cell group, a first connection point of two first battery strings and a second connection point of two second battery strings are electrically connected by a jumper, the jumper including two sub-jumpers, any first battery string and second battery string having a common endpoint are respectively connected in reverse parallel to the same diode through the two sub-jumpers, the adjacent ends of the two sub-jumpers being... A first lead-out terminal extends in a direction away from the plane where the battery cell is located, and the two first leads-out terminals of the two sub-jumpers are parallel to each other. A central busbar connects the first battery cell and the second battery cell. The central busbar includes at least one partition area located between two common endpoints in the battery cell group. The central busbar is divided into multiple sub-central busbars by the partition area. The ends of two adjacent sub-central busbars formed by the partition area are electrically connected to a diode between the jumper and the jumper. The ends of two adjacent sub-central busbars are both second leads-out terminals. The second leads-out terminals extend in a direction away from the plane where the battery cell is located, and the two second leads-out terminals of two adjacent sub-central busbars are parallel to each other. Each second lead-out terminal is perpendicular to each first lead-out terminal.

[0007] According to the photovoltaic module of the present invention, by electrically connecting jumpers between the first connection points of two first cell strings and the second connection points of two second cell strings, and by connecting any first cell string and second cell string with a common endpoint to the same diode in reverse parallel through two sub-jumpers, each diode is connected in parallel with only one first cell unit and one second cell unit. This reduces the number of cell strings with diodes connected in parallel. While ensuring that the diodes are not damaged, the number of cells in each cell string increases, thus avoiding the problem of reverse breakdown of diodes that easily occurs when increasing the number of cells in the photovoltaic module. Furthermore, by setting two parallel first leads and two parallel second leads, and making each first lead perpendicular to each second lead, the connection between the diode and the first and second cell units is more secure. This avoids soldering problems such as cold solder joints or desoldering caused by sharing diode leads, thereby preventing the simultaneous diode protection failure of the first and second cell units and reducing the risk of hot spots.

[0008] According to some embodiments of the present invention, each of the first leads is formed by bending a portion of the corresponding sub-jump wire toward a direction away from the plane where the battery cell is located; each of the second leads is formed by bending a portion of the corresponding central busbar toward a direction away from the plane where the battery cell is located.

[0009] According to some embodiments of the present invention, the two first leads are located between the two second leads, and the distance between the two first leads is less than the distance between the two second leads.

[0010] According to some embodiments of the present invention, the distance between any two adjacent pairs of the two first leads and the two second leads is at least 2 mm.

[0011] According to some embodiments of the present invention, two first battery strings and two second battery strings are arranged side by side. Each first battery string and each second battery string includes an interconnecting strip group. The interconnecting strip group includes multiple interconnecting strips. The multiple interconnecting strips are electrically connected to multiple battery cells in the corresponding first battery string and second battery string. The multiple interconnecting strips extend along the string arrangement direction of the multiple battery cells and are parallel to each other. One end of the jumper is located between the two interconnecting strip groups of the two first battery strings and the other end is located between the two interconnecting strip groups of the two second battery strings. The jumper is spaced apart from the two interconnecting strip groups of the two first battery strings and the two interconnecting strip groups of the two second battery strings.

[0012] According to some embodiments of the present invention, two first battery strings and two second battery strings are arranged side by side, and the ends of two adjacent battery cells in each first battery string and each second battery string are connected by conductive adhesive.

[0013] According to some embodiments of the present invention, the photovoltaic module further includes a cover plate and a back plate. The cover plate is disposed on the upper surface of the solar cell, and the back plate is disposed on the lower surface of the solar cell. At least two first through holes and at least two second through holes are formed on the back plate. Each first lead-out end passes through the first through hole to extend out of the surface of the back plate. The shape of the first through hole is at least one of a circle, an ellipse, an oblong shape, and a polygon. Each second lead-out end passes through the second through hole to extend out of the surface of the back plate. The shape of the second through hole is at least one of a circle, an ellipse, an oblong shape, and a polygon.

[0014] According to some embodiments of the present invention, both the first perforation and the second perforation are rectangular in shape.

[0015] According to some embodiments of the present invention, the four corners of the first perforation and the second perforation are smoothly transitioned.

[0016] According to some embodiments of the present invention, the back plate is a glass component, and the first perforation and the second perforation are both circular in shape.

[0017] According to some embodiments of the present invention, the photovoltaic module further includes: a junction box, wherein the junction box is provided with four solder pads, two first leads and two second leads are respectively electrically connected to the four solder pads, and the junction box is provided with two diodes corresponding to the same battery cell group.

[0018] According to some embodiments of the present invention, the junction box has a first hole and two second holes, the two second holes being located on both sides of the first hole, the two first leads passing through the first hole and electrically connected to two of the four pads, and the two second leads passing through the two second holes and electrically connected to the other two of the four pads.

[0019] According to some embodiments of the present invention, the first hole is a rectangular hole, two of the four pads are located on opposite sides of the first hole, two second holes are located on the other opposite sides of the first hole, and the other two pads are located on the side of the corresponding second hole away from the center of the first hole.

[0020] According to some embodiments of the present invention, the four pads are arranged in a central configuration, and the two diodes are located on either side of the four pads.

[0021] According to some embodiments of the present invention, the junction box is provided with a first electrical connection piece, a second electrical connection piece and a third electrical connection piece, one of the two diodes is electrically connected to the first electrical connection piece and the second electrical connection piece, and the other of the two diodes is electrically connected to the second electrical connection piece and the third electrical connection piece.

[0022] According to some embodiments of the present invention, two of the four pads are disposed on the second electrical connection piece, and the other two of the four pads are respectively disposed on the first electrical connection piece and the third electrical connection piece.

[0023] According to some embodiments of the present invention, the first electrical connector includes a first connecting segment and a second connecting segment connected to each other. The first connecting segment extends along the length direction of the junction box, and the second connecting segment extends along the width direction of the junction box. The second electrical connector is disposed between the first electrical connector and the third electrical connector. The second electrical connector includes an electrical connector body and two connecting portions, which are respectively connected to both sides of the electrical connector body. Two of the four pads are disposed on the electrical connector body. The third electrical connector includes a third connecting segment and a fourth connecting segment. The third connecting segment extends along the length direction of the junction box, and the fourth connecting segment extends along the width direction of the junction box. The other two of the four pads are respectively disposed on the second connecting segment and the fourth connecting segment. One of the two diodes is disposed on one of the two connecting portions. The pin of the one of the two diodes is electrically connected to the first connecting segment. The other of the two diodes is disposed on the fourth connecting segment, and the pin of the other of the two diodes is electrically connected to the other of the two connecting portions.

[0024] According to some embodiments of the present invention, an insulating layer is provided between the jumper and the battery cell group.

[0025] According to some embodiments of the present invention, the insulating layer includes a first insulating segment and a second insulating segment. The first insulating segment is disposed between two first battery strings and extends along the string arrangement direction of a plurality of battery cells in the first battery string. The second insulating segment is disposed between two second battery strings and extends along the string arrangement direction of a plurality of battery cells in the second battery string.

[0026] According to some embodiments of the present invention, one end of the insulating layer is located at the end of the first battery string away from the second battery string, and the other end of the insulating layer extends along the string arrangement direction of the plurality of battery cells in the same battery cell group to the end of the second battery string away from the first battery string.

[0027] According to some embodiments of the present invention, at least one of the battery cell groups comprises a plurality of battery cells forming a battery cell array, the length of the insulating layer is greater than the length of the battery cell array and less than the distance between the first connection point and the second connection point, and the width of the insulating layer is greater than the width of the jumper wire.

[0028] According to some embodiments of the present invention, the two first leads are in contact with each other.

[0029] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0031] Figure 1 This is a circuit diagram of a photovoltaic module in the prior art;

[0032] Figure 2 This is a circuit diagram of a photovoltaic module provided in an embodiment of the present invention;

[0033] Figure 3 This is a circuit diagram of another photovoltaic module provided in an embodiment of the present invention;

[0034] Figure 4 yes Figure 3 A schematic diagram of the structure of a photovoltaic module;

[0035] Figure 5 It is along Figure 4 A schematic diagram of the cross-sectional structure along the dashed line AB.

[0036] Figure 6 This is a schematic diagram of the cross-sectional structure of a jumper provided in an embodiment of the present invention;

[0037] Figure 7 This is a schematic diagram of the structure of the battery cell group of a photovoltaic module according to an embodiment of the present invention;

[0038] Figure 8 This is a circuit diagram of a battery cell group of a photovoltaic module according to an embodiment of the present invention;

[0039] Figure 9 This is a schematic diagram of the structure of the first lead and the second lead of a battery cell assembly according to an embodiment of the present invention;

[0040] Figure 10 This is a schematic diagram of the first battery cell of a photovoltaic module according to an embodiment of the present invention;

[0041] Figure 11 This is a schematic diagram of the junction box of a photovoltaic module according to an embodiment of the present invention;

[0042] Figure 12 This is a schematic diagram of the structure of the first cell string of a photovoltaic module according to an embodiment of the present invention;

[0043] Figure 13 This is a schematic diagram of the lead wires and lead ends of a battery cell assembly according to another embodiment of the present invention.

[0044] Explanation of reference numerals in the attached figures

[0045] 1- Battery string; 2- Series structure; 3- Parallel structure; 4- Diode; 5- Battery cell;

[0046] 100 - Battery cell group; 110 - First battery cell; 120 - Second battery cell;

[0047] 101 - First battery string; 102 - Second battery string; 201 - Battery cell; 300 - Jumper wire;

[0048] 310 - First sub-section; 320 - Second sub-section; 330 - First lead; 200 - Diode;

[0049] 210: Pin; O - First connection point; P - Second connection point; 400 - Insulating layer;

[0050] 10-cell array; 600: interconnection strip group; 610: interconnection strip; 700: center busbar;

[0051] 720: Second lead; 730: Sub-center busbar; 800: Junction box; 810: Solder pad;

[0052] 820: First hole; 830: Second hole; 840: First electrical connector; 8401: First connecting section;

[0053] 8402: Second connecting section; 850: Second electrical connecting piece; 8501: Electrical connecting piece body;

[0054] 8502: Connecting part; 860: Third electrical connecting piece; 8601: Third connecting section;

[0055] 8602: Fourth connecting section; 900: Busbars at both ends; 910: Conductive adhesive. Detailed Implementation

[0056] The following is for reference. Figures 1-13 A photovoltaic module according to an embodiment of the present invention is described.

[0057] like Figures 2-5 As shown, a photovoltaic module according to an embodiment of the present invention includes at least one battery cell group 100.

[0058] Specifically, refer to Figures 7-9 , Figure 13The battery cell group 100 includes a first battery cell 110 and a second battery cell 120, which are connected in parallel. The first battery cell 110 includes two first battery strings 101 connected in series. The second battery cell 120 includes two second battery strings 102 connected in series. Both the first battery string 101 and the second battery string 102 include multiple battery cells 201 connected in series. In the description of this invention, "multiple" means two or more.

[0059] In the same battery cell group 100, the first connection point O of two first battery strings 101 and the second connection point P of two second battery strings 102 are electrically connected by a jumper 300, which includes two sub-jumpers. Any first battery string 101 and second battery string 102 with a common endpoint are respectively connected to the same diode 200 in reverse parallel through the two sub-jumpers. The adjacent ends of the two sub-jumpers are the first leads 330, which extend in a direction away from the plane where the battery cell 201 is located, and the two first leads 330 of the two sub-jumpers are parallel to each other. A central busbar 700 is connected in parallel between the first battery cell 110 and the second battery cell 120. The central busbar 700 includes at least one partition area located between two common endpoints in the battery cell group 100. The central busbar 700 is divided into multiple sub-central busbars 730 by the partition area. A diode 200 is electrically connected to the end of each of two adjacent sub-central busbars 730 formed by the partition area and a jumper wire 300. The ends of two adjacent sub-central busbars 730 are both second leads 720. The second leads 720 extend in a direction away from the plane where the battery cell 201 is located, and the two second leads 720 of two adjacent sub-central busbars 730 are parallel to each other. Each second lead 720 is perpendicular to each first lead 330. The two sub-jump wires are a first sub-section 310 and a second sub-section 320.

[0060] For example, in Figures 3-5In the example, the photovoltaic module includes three cell unit groups 100. Each cell unit group 100 includes a first cell unit 110 and a second cell unit 120 connected in parallel. The first cell unit 110 includes two first cell strings 101 connected in series, and the second cell unit 120 includes two second cell strings 102 connected in series. The first cell strings 101 and 102 each include multiple solar cells 201 connected in series. Within the same cell unit group 100, a jumper 300 is used to electrically connect the first connection point O of the two first cell strings 101 and the second connection point P of the two second cell strings 102. The two sub-jumpers of the jumper 300 respectively connect the first cell strings 101 and 102, which share a common endpoint, in reverse parallel to the same diode 200. The diode 200 prevents hot spot effects when the first cell unit 110 or the second cell unit 120 connected in parallel is shaded. Moreover, since the output voltage across the photovoltaic module is relatively large when multiple battery cells 201 are connected in series, the parallel connection of the first battery cell 110 and the second battery cell 120 can reduce the output voltage of the photovoltaic module by half.

[0061] A central busbar 700 connects the first battery cell 110 and the second battery cell 120. The central busbar 700 includes three partitioned areas, each located between the two common endpoints of the first battery string 101 and the second battery string 102 in the corresponding battery cell group 100. (Refer to...) Figure 10 The two sub-jumpers have opposite ends designated as first leads 330. Both first leads 330 extend in a direction away from the plane containing the battery cell 201 and are parallel to each other. The two ends of the sub-center busbar 730 formed by the partition area are second leads 720. Both second leads 720 also extend in a direction away from the plane containing the battery cell 201 and are parallel to each other. Each second lead 720 is electrically connected to a diode 200 between itself and its corresponding jumper 300. The second leads 720 are perpendicular to the first leads 330. It should be noted that when the first leads 330 and the first leads 42 are... Figure 10 When the sheet-like structure is shown, the planes containing the two first leads 330 are parallel to each other, the planes containing the two second leads 720 are parallel to each other, and the plane containing each first lead 330 is perpendicular to the plane containing each second lead 720; when the first lead 330 or the second lead 720 is another structure such as a triangular prism structure (i.e., the cross-section of the first lead 330 or the second lead 720 is triangular), refer to Figure 13At least two sides of the two first leads 330 are parallel to each other, and at least two sides of the two second leads 720 are parallel to each other. The aforementioned at least two sides of the two first leads 330 and the aforementioned at least two sides of the two second leads are perpendicular to each other. The two first leads 330 and the two second leads 720 can extend perpendicularly to the plane containing the battery cell 201 (e.g., ...). Figure 9 and Figure 13 As shown in the figure, the angle between the two first leads 330, the two second leads 720 and the plane containing the battery cell 201 can be 90°. Of course, the present invention is not limited to this. The two first leads 330 and the two second leads 720 can also extend obliquely relative to the plane containing the battery cell 201. That is, the angle between the two first leads 330, the two second leads 720 and the plane containing the battery cell 201 does not have to be 90° (not shown in the figure), as long as the two first leads 330 are parallel to each other, the two second leads 720 are parallel to each other, and the first leads 330 and the second leads 720 are perpendicular to each other.

[0062] Therefore, with the above configuration, each diode 200 is connected in parallel with only one first battery cell 110 and one second battery cell 120. Compared with the traditional configuration where each diode 200 is connected in parallel with two first battery cells 110 and two second battery cells 120, the number of battery strings in parallel with the diode 200 is reduced. While ensuring that the diode 200 is not broken down, the number of solar cells 201 in each battery string increases, thus avoiding the problem of reverse breakdown of the diode 200 that is easily caused when increasing the number of solar cells 201 in the photovoltaic module. Furthermore, by setting two parallel first leads 330 and two parallel second leads 720, and making each first lead 330 perpendicular to each second lead 720, the connection between the diode 200 and the first battery cell 110 and the second battery cell 120 is more secure. This avoids soldering problems such as cold solder joints or desoldering caused by sharing the diode 200 leads, thereby preventing the simultaneous failure of diode 200 protection in both the first battery cell 110 and the second battery cell 120, and reducing the risk of hot spots.

[0063] Figures 3-5 The illustration shows three battery cell groups 100 and three partition regions for illustrative purposes. However, those skilled in the art, after reading the technical solution of this application, will obviously understand that the solution can be applied to other numbers of battery cell groups 100 and partition regions, which would also fall within the protection scope of this invention.

[0064] According to the photovoltaic module of the present invention, by electrically connecting a jumper 300 between the first connection point O of two first battery strings 101 and the second connection point P of two second battery strings 102, and by connecting any first battery string 101 and second battery string 102 with a common endpoint to the same diode 200 in reverse parallel through two sub-jumps, each diode 200 is connected in parallel with only one first battery cell 110 and one second battery cell 120, thereby reducing the number of battery strings in parallel with the diode 200. Under the premise of ensuring that the diode 200 is not broken down, the number of cells 201 in each battery string increases, thereby avoiding the problem of reverse breakdown of the diode 200 that is easily caused when the number of cells 201 in the photovoltaic module is increased. Furthermore, by setting two parallel first leads 330 and two parallel second leads 720, and making each first lead 330 perpendicular to each second lead 720, the connection between the diode 200 and the first battery cell 110 and the second battery cell 120 is made more reliable. This avoids the problem of poor soldering, such as cold solder joints or desoldering, caused by sharing the diode 200 leads. As a result, the problem of simultaneous diode 200 protection failure in the first battery cell 110 and the second battery cell 120 can be avoided, thereby reducing the risk of hot spots.

[0065] In some embodiments of the present invention, reference is made to... Figure 9 and Figure 13 Each first lead-out terminal 330 is formed by bending a portion of the corresponding sub-jump wire toward a direction away from the plane where the battery cell 201 is located, and each second lead-out terminal 720 is formed by bending a portion of the corresponding central busbar 700 toward a direction away from the plane where the battery cell 201 is located. For example, when the first lead-out terminal 330 and the second lead-out terminal 720 are sheet-like structures (such as... Figure 9 When (as shown), the planes containing the two first leads 330 are parallel to each other, the planes containing the two second leads 720 are parallel to each other, and the plane containing each first lead 330 is perpendicular to the plane containing each second lead 720; when the first lead 330 or the second lead 720 is another structure, such as a triangular prism structure (i.e., the cross-section of the first lead 330 or the second lead 720 is triangular), refer to Figure 13Before bending, the surfaces of the two first leads 330 that are in contact with the solar cell 201 are parallel to each other, and the surfaces of the two second leads 720 that are in contact with the solar cell 201 before bending are parallel to each other. Furthermore, the surface of each first lead 330 that is in contact with the solar cell 201 before bending is perpendicular to the surface of each second lead 720 that is in contact with the solar cell 201 before bending. Therefore, compared to the traditional method of welding L-shaped leads onto a single integral busbar, this design is simpler, easier to process, ensures the connection strength between the diode 200 and the first solar cell 110 and the second solar cell 120, and facilitates automated welding of the jumper 300 and the central busbar 700, thereby improving manufacturing efficiency and saving manpower. Moreover, this configuration of the jumper 300 and the central busbar 700 is beneficial for the mass production of photovoltaic modules.

[0066] Optionally, combined Figure 9 and Figure 13 The two first leads 330 are located between the two second leads 720, and the distance between the two first leads 330 is less than the distance between the two second leads 720. This arrangement makes the structure of the first leads 330 and the second leads 720 more compact and saves space.

[0067] Furthermore, referring to Figure 9 and Figure 13 The distance between any two adjacent first leads 330 and two second leads 720 is at least 2 mm. For example, in Figure 9 and Figure 13 In the example, two first leads 330 are opposite each other, and two second leads 720 are opposite each other, with each first lead 330 adjacent to both second leads 720. The distance between each first lead 330 and each of the two adjacent second leads 720 is at least 2 mm. Therefore, while ensuring the conversion efficiency of the photovoltaic module, sufficient heat dissipation space can be guaranteed for the solar cell 201, ensuring the reliability of the photovoltaic module.

[0068] Optionally, refer to Figure 4 , Figure 5 and Figure 7 An insulating layer 400 is provided between the jumper 300 and the battery cell group 100. For example, in Figure 4 , Figure 5 and Figure 7 In the example, the insulating layer 400 is located between the jumper 300 and the multiple solar cells 201, and the width of the insulating layer 400 is greater than the width of the jumper 300. Thus, by setting the insulating layer 400, the normal operation of the photovoltaic module can be ensured. The insulating layer 400 can be a reflective film.

[0069] In some embodiments of the present invention, such as Figure 7As shown, two first battery strings 101 and two second battery strings 102 are arranged side by side. Each first battery string 101 and each second battery string 102 includes an interconnecting strip group 600, which includes multiple interconnecting strips 610. The multiple interconnecting strips 610 are electrically connected to multiple battery cells 201 within the corresponding first battery string 101 and second battery string 102. The multiple interconnecting strips 610 extend along the string arrangement direction of the multiple battery cells 201 and are parallel to each other. One end of the jumper 300 is located between the two interconnecting strip groups 600 of the two first battery strings 101, and the other end is located between the two interconnecting strip groups 600 of the two second battery strings 102. The jumper 300 is spaced apart from the two interconnecting strip groups 600 of the two first battery strings 101 and the two interconnecting strip groups 600 of the two second battery strings 102. It should be noted that the "string arrangement direction of the multiple battery cells 201" refers to... Figure 8 The up and down directions in the middle.

[0070] For example, in Figure 7 In the example, within the same battery cell group 100, two first battery strings 101 of the first battery cell 110 are arranged side-by-side, and two second battery strings 102 of the second battery cell 120 are arranged side-by-side. Each first battery string 101 and each second battery string 102 includes multiple battery cells 201 arranged vertically. The multiple battery cells 201 in each first battery string 101 are electrically connected to multiple interconnecting bars 610, and the multiple battery cells 201 in each second battery string 102 are electrically connected to corresponding multiple interconnecting bars 610. The multiple interconnecting bars 610 extend vertically... The jumper wires 300 are extended and parallel to each other. The upper end of the jumper wire 300 is located between the two interconnecting strip groups 600 of the two first battery strings 101, and the lower end of the jumper wire 300 is located between the two interconnecting strip groups 600 of the two second battery strings 102. For example, when the distance between the two interconnecting strip groups 600 of the two first battery strings 101 or the two interconnecting strip groups 600 of the two second battery strings 102 is X, the width of the insulating layer 400 is less than X, so that the jumper wire 300 does not contact the two interconnecting strip groups 600 of the two first battery strings 101 or the two interconnecting strip groups 600 of the two second battery strings 102. Thus, through the above arrangement, the problem of increased local height due to the stacking of the jumper wire 300 and the interconnecting strip 610, which could lead to lamination cracking, can be avoided, ensuring the structural strength and stability of the photovoltaic module.

[0071] In other embodiments of the invention, such as Figure 12 As shown, two first battery strings 101 and two second battery strings 102 are arranged side by side, and the ends of two adjacent battery cells 201 within each first battery string 101 and each second battery string 102 are connected by conductive adhesive 910. For example, in Figure 13The example shows five solar cells 201 arranged in a shingled configuration, with the ends of adjacent cells 201 overlapping. This arrangement allows for more solar cells 201 to be stacked per unit area, improving the power generation and stability of the photovoltaic module.

[0072] In some embodiments of the present invention, the photovoltaic module further includes a cover plate and a back plate (not shown). The cover plate is disposed on the upper surface of the solar cell 201, and the back plate is disposed on the lower surface of the solar cell 201. At least two first through holes and at least two second through holes are formed on the back plate. Each first lead-out end 330 passes through a first through hole to extend out of the surface of the back plate. The shape of each first through hole can be at least one of a circle, ellipse, oblong, and polygon. Each second lead-out end 720 passes through a second through hole to extend out of the surface of the back plate. The shape of each second through hole can be at least one of a circle, ellipse, oblong, and polygon. Thus, by providing the first and second through holes, the first lead-out end 330 and the second lead-out end 720 can respectively pass through the first and second through holes and be electrically connected to the junction box 800, thereby connecting the power generated by the photovoltaic module to an external line and conducting the current generated by the photovoltaic module. In addition, when the first or second perforation is circular, elliptical, or oblong, the stress in the first or second perforation is more dispersed, which can ensure the structural strength of the back sheet; when the first or second perforation is polygonal, the area of ​​the first or second perforation is smaller, which can reduce the water vapor transmission rate and thus improve the service life of the photovoltaic module.

[0073] In some optional embodiments of the present invention, both the first perforation and the second perforation are rectangular in shape. Therefore, by making both the first and second perforations rectangular, their areas are smaller, which reduces the water vapor transmission rate, thereby ensuring the reliability of the photovoltaic module and improving its service life.

[0074] Furthermore, the four corners of the first and second perforations are rounded off. This avoids stress concentration and ensures the structural strength of the back plate.

[0075] In some alternative embodiments of the present invention, the back plate is a glass component, and both the first and second perforations are circular in shape. Therefore, by making both the first and second perforations circular, the stress in the first and second perforations is more dispersed, thus ensuring the structural strength of the glass component.

[0076] In a further embodiment of the present invention, reference is made to Figure 11The photovoltaic module further includes a junction box 800, which contains four solder pads 810. Two first leads 330 and two second leads 720 are electrically connected to the four solder pads 810, respectively. The junction box 800 also contains two diodes 200 corresponding to the same cell unit group 100. Thus, by electrically connecting the two first leads 330 and the two second leads 720 to the four solder pads 810, a reliable connection between the cell unit group 100 and the junction box 800 is ensured, thereby connecting the power generated by the photovoltaic module to external wiring and conducting the current generated by the photovoltaic module. By including two diodes 200 corresponding to the same cell unit group 100 within the junction box 800, the impact of hot spot phenomena on the photovoltaic module is reduced, while also simplifying the structure of the photovoltaic module.

[0077] Furthermore, such as Figure 11 As shown, the junction box 800 has a first hole 820 and two second holes 830. The two second holes 830 are located on both sides of the first hole 820. Both first leads 330 pass through the first hole 820 and are electrically connected to two of the four pads 810. Both second leads 720 pass through the two second holes 830 and are electrically connected to the other two of the four pads 810. Thus, by having both first leads 330 pass through the first hole 820 and be electrically connected to two of the four pads 810, a reliable connection between the first leads 330 and the pads 810 is ensured, while reducing the difficulty of drilling and simplifying the manufacturing process.

[0078] Furthermore, referring to Figure 11 The first hole 820 is a rectangular hole. Two of the four pads 810 are located on opposite sides of the first hole 820. The two second holes 830 are located on the other opposite sides of the first hole 820. The other two pads 810 are located on the side of the corresponding second hole 830 furthest from the center of the first hole 820. For example, in Figure 11 In the example, the two second holes 830 are located on the left and right sides of the first hole 820, respectively, and the four pads 810 are located above the first hole 820, below the first hole 820, to the left of the left second hole 830, and to the right of the right second hole 830, respectively. Both first leads 330 pass through the first hole 820 and are electrically connected to the pads 810 located on the upper and lower sides of the first hole 820. The two second leads 720 pass through the two second holes 830 and are electrically connected to the pads 810 on the left and right sides, respectively. This arrangement places the four pads 810 on the outside of the first hole 820, making it easier to connect the first leads 330 and second leads 720 to the four pads 810 and reducing manufacturing difficulty.

[0079] Optionally, such as Figure 11As shown, four pads 810 are centrally located, with two diodes 200 positioned on either side of the four pads 810. This central arrangement of the four pads 810 facilitates manufacturing and promotes automated soldering of the junction box 800. Furthermore, positioning the two diodes 200 on either side of the four pads 810 increases the distance between them, effectively reducing junction temperature.

[0080] In some embodiments of the present invention, reference is made to... Figure 11 The junction box 800 contains a first electrical connection piece 840, a second electrical connection piece 850, and a third electrical connection piece 860. One of the two diodes 200 is electrically connected to the first electrical connection piece 840 and the second electrical connection piece 850, and the other of the two diodes 200 is electrically connected to both the second electrical connection piece 850 and the third electrical connection piece 860. For example, in Figure 12 In the example, two diodes 200 are located on the left and right sides of the four pads 810, respectively. The diode 200 on the left is electrically connected to the first electrical connector 840 and the second electrical connector 850, while the diode 200 on the right is electrically connected to the second electrical connector 850 and the third electrical connector 860. Thus, by setting the first electrical connector 840, the second electrical connector 850, and the third electrical connector 860, the two diodes 200 are distributed at both ends of the junction box 800, thereby isolating the heat source of the diodes 200 and reducing the junction temperature.

[0081] Furthermore, combined Figure 11 Two of the four pads 810 are located on the second electrical connection piece 850, and the other two of the four pads 810 are located on the first electrical connection piece 840 and the third electrical connection piece 860, respectively. For example, in Figure 11 In the example, two first leads 330 pass through the first hole 820 and are electrically connected to the pads 810 on the upper and lower sides of the first hole 820. Two second leads 720 pass through the second hole 830 and are electrically connected to the two pads 810 on the left and right sides. The two pads 810 on the upper and lower sides of the first hole 820 are located on the second electrical connection piece 850, and the two pads 810 on the left and right sides are located on the first electrical connection piece 840 and the third electrical connection piece 860, respectively. Since the diode 200 on the left is electrically connected to the first electrical connection piece 840 and the second electrical connection piece 850, and the diode 200 on the right is electrically connected to the second electrical connection piece 850 and the third electrical connection piece 860, this configuration achieves the electrical connection of the two first leads 330, the two second leads 720, and the two diodes 200, and the structure is simple and easy to implement.

[0082] In some specific embodiments of the present invention, such as Figure 11As shown, the first electrical connector 840 includes a first connecting segment 8401 and a second connecting segment 8402 connected to each other. The first connecting segment 8401 extends along the length direction of the junction box 800, and the second connecting segment 8402 extends along the width direction of the junction box 800. The second electrical connector 850 is disposed between the first electrical connector 840 and the third electrical connector 860. The second electrical connector 850 includes an electrical connector body 8501 and two connecting portions 8502, which are respectively connected to both sides of the electrical connector body 8501. Two of the four solder pads 810 are disposed on the electrical connector body 8501. The third electrical connector 860 includes a third connecting segment 8601 and a fourth connecting segment 8402. The connecting segment 8602 and the third connecting segment 8601 extend along the length of the junction box 800, and the fourth connecting segment 8602 extends along the width of the junction box 800. The other two of the four solder pads 810 are respectively provided on the second connecting segment 8402 and the fourth connecting segment 8602. One of the two diodes 200 is provided on one of the two connecting parts 8502. The pin 210 of the aforementioned one of the two diodes 200 is electrically connected to the first connecting segment 8401. The other of the two diodes 200 is provided on the fourth connecting segment 8602. The pin 210 of the aforementioned other one of the two diodes 200 is electrically connected to the other one of the two connecting parts 8502.

[0083] For example, in Figure 11In the example, a second electrical connecting piece 850 is provided between the first electrical connecting piece 840 and the third electrical connecting piece 860. The first electrical connecting piece 840 is roughly "7" shaped. The first connecting segment 8401 of the first electrical connecting piece 840 extends horizontally, and the second connecting segment 8402 extends vertically. The right end of the first connecting segment 8401 is connected to the upper end of the second connecting segment 8402. The second electrical connecting piece 850 is roughly "inverted T" shaped. The diode 200 on the left side is provided on the left connecting portion 8502 of the second electrical connecting piece 850. The pin 210 of the left diode 200 is electrically connected to the first connecting segment 8401 of the first electrical connecting piece 840. The shape of the third electrical connecting piece 860 is similar to that of the first electrical connecting piece 840. The first electrical connector 840 is roughly symmetrical in shape. The third electrical connector 860 has a third connecting segment 8601 extending horizontally and a fourth connecting segment 8602 extending vertically. The left end of the third connecting segment 8601 is connected to the upper end of the fourth connecting segment 8602. The diode 200 on the right side is located on the fourth connecting segment 8602, and the pin 210 of the right-side diode 200 is electrically connected to the right connecting portion 8502 of the second electrical connector 850. The two pads 810 located on the upper and lower sides of the first hole 820 are located on the electrical connector body 8501 of the second electrical connector 850, and the two pads 810 on the left and right sides are located on the second connecting segment 8402 and the fourth connecting segment 8602, respectively. Thus, the first electrical connector 840, the second electrical connector 850, and the third electrical connector 860, configured in this way, not only achieve the electrical connection between the two diodes 200 and the two first leads 330 and the two second leads 720, but also further ensure that the two diodes 200 can be separated from each other, thereby reducing the junction temperature.

[0084] In some optional embodiments of the present invention, the insulating layer 400 includes a first insulating segment and a second insulating segment (not shown in the figure). The first insulating segment is disposed between two first battery strings 101 and extends along the string arrangement direction of the plurality of battery cells 201 in the first battery string 101. The second insulating segment is disposed between two second battery strings 102 and extends along the string arrangement direction of the plurality of battery cells 201 in the second battery string 102. It should be noted that "the first insulating segment is disposed between two first battery strings 101" means that the first insulating segment is disposed between two first battery strings 101 in the same battery cell group 100; similarly, "the second insulating segment is disposed between two second battery strings 102" means that the second insulating segment is disposed between two second battery strings 102 in the same battery cell group 100. Thus, by setting the first insulating segment and the second insulating segment, the insulating layer 400 has a segmented structure, making it easier to connect the insulating layer 400 to the plurality of battery cells 201, and effectively avoiding electrical connection between the jumper 300 and the battery cells 201.

[0085] Of course, the present invention is not limited thereto. In some other alternative embodiments of the present invention, refer to Figure 4 and Figure 7One end of the insulating layer 400 (e.g., Figure 4 The upper end of the first battery string 101 is located at the end of the first battery string 101 that is away from the second battery string 102, and the other end of the insulating layer 400 (e.g., Figure 4 The lower end of the first battery string 102 extends along the string arrangement direction of multiple battery cells 201 in the same battery cell group 100 to the end of the second battery string 102 away from the first battery string 101. For example, in Figure 4 and Figure 7 In the example, the multiple battery cells 201 are arranged in a vertical direction, and the insulating layer 400 extends vertically. The upper end of the insulating layer 400 is located at the upper end of the first battery string 101, and the lower end of the insulating layer 400 extends to the lower end of the second battery string 102. Thus, the insulating layer 400 is a one-piece molded structure, which is simple in structure and easy to process.

[0086] Furthermore, referring to Figure 4 , Figure 5 and Figure 7 In the same battery cell group 100, at least one battery cell group 100 contains multiple battery cells 201 forming a battery cell array 10. The length of the insulating layer 400 is greater than the length of the battery cell array 10 and less than the distance between the first connection point O and the second connection point P. The width of the insulating layer 400 is greater than the width of the jumper wire 300. For example, in Figure 4 and Figure 5 In the example, the photovoltaic module includes three battery cell groups 100, and multiple cells 201 in the three battery cell groups 100 form a cell array 10. The length of the insulating layer 400 is greater than the length of the cell array 10, and the length of the insulating layer 400 is less than the distance between the first connection point O of two first cell strings 101 and the second connection point P of two second cell strings 102 in the same battery cell group 100. This configuration ensures that the jumper 300 is insulated from the multiple cells 201, while avoiding affecting the electrical connection between the jumper 300 and the first connection point O and the second connection segment 8402.

[0087] Optionally, the two first leads 330 can be in contact with each other (not shown in the figure). This reduces the number of perforations on the solar cell 201, thereby further reducing water vapor transmission and improving the lifespan of the photovoltaic module.

[0088] Optionally, each jumper 300 is electrically connected to two busbars 900 at both ends. Thus, by setting up the two busbars 900, the current of each battery cell group 100 can be collected.

[0089] Other components of the photovoltaic module according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0090] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" 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 invention and simplifying the description, and are not intended to 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 invention.

[0091] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0092] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0093] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, characterized by, include: At least one battery cell group, the battery cell group including a first battery cell and a second battery cell, the first battery cell and the second battery cell being connected in parallel, the first battery cell including two first battery strings being connected in series, the second battery cell including two second battery strings being connected in series, and both the first battery strings and the second battery strings including multiple battery cells, the multiple battery cells being connected in series. In the same battery cell group, the first connection points of the two first battery strings and the second connection points of the two second battery strings are electrically connected via jumpers. Each jumper includes two sub-jumpers. Any first battery string and second battery string with a common endpoint are respectively connected in reverse parallel to the same diode via the two sub-jumpers. The adjacent ends of the two sub-jumpers are first leads, extending away from the plane containing the battery cells, and the two first leads of the two sub-jumpers are parallel to each other. A central busbar connects the first battery cell and the second battery cell. The central busbar includes at least one partition area located between two common endpoints of the battery cell group. The central busbar is divided into multiple sub-central busbars by the partition area. A diode is electrically connected between the ends of two adjacent sub-central busbars formed by the partition area and the jumper wire. The ends of two adjacent sub-central busbars are both second leads. The second leads extend in a direction away from the plane where the battery cell is located, and the two second leads of two adjacent sub-central busbars are parallel to each other. Each second lead is perpendicular to each first lead.

2. The photovoltaic module according to claim 1, characterized in that, Each of the first leads is formed by bending a portion of the corresponding sub-jump wire toward a direction away from the plane where the battery cell is located; Each of the second leads is formed by bending a portion of the corresponding central busbar in a direction away from the plane where the battery cell is located.

3. The photovoltaic module according to claim 1, characterized in that, The two first leads are located between the two second leads, and the distance between the two first leads is less than the distance between the two second leads.

4. The photovoltaic module according to claim 1, characterized in that, The distance between any two adjacent first leads and two second leads is at least 2 mm.

5. The photovoltaic module according to claim 1, characterized in that, Two first battery strings and two second battery strings are arranged side by side. Each first battery string and each second battery string includes an interconnecting strip group, which includes multiple interconnecting strips. The multiple interconnecting strips are electrically connected to multiple battery cells within the corresponding first battery string and second battery string. The multiple interconnecting strips extend along the string arrangement direction of the multiple battery cells and are parallel to each other. One end of the jumper is located between the two interconnecting strip groups of the two first battery strings, and the other end is located between the two interconnecting strip groups of the two second battery strings. The jumper is spaced apart from the two interconnecting strip groups of the two first battery strings and the two interconnecting strip groups of the two second battery strings.

6. The photovoltaic module according to claim 1, characterized in that, The two first battery strings and the two second battery strings are arranged side by side, and the ends of two adjacent battery cells in each first battery string and each second battery string are connected by conductive adhesive.

7. The photovoltaic module according to any one of claims 1-6, characterized in that, The photovoltaic module further includes a cover plate and a back sheet. The cover plate is disposed on the upper surface of the solar cells, and the back sheet is disposed on the lower surface of the solar cells. The back sheet has at least two first through holes and at least two second through holes. Each of the first leads extends through the first perforation to protrude from the surface of the back plate, wherein the shape of the first perforation is at least one of circular, elliptical, oblong, and polygonal. Each of the second leads extends through the second perforation to protrude from the surface of the back plate, the shape of the second perforation being at least one of a circle, an ellipse, an oblong shape, and a polygon.

8. The photovoltaic module according to claim 7, characterized in that, Both the first perforation and the second perforation are rectangular in shape.

9. The photovoltaic module according to claim 8, characterized in that, The four corners of the first and second perforations are smoothly rounded.

10. The photovoltaic module according to claim 7, characterized in that, The back plate is made of glass, and both the first and second perforations are circular in shape.

11. The photovoltaic module according to any one of claims 1-6, characterized in that, Further includes: The junction box contains four solder pads, with two first leads and two second leads electrically connected to the four solder pads respectively. The junction box also contains two diodes corresponding to the same battery cell group.

12. The photovoltaic module according to claim 11, characterized in that, The junction box has a first hole and two second holes. The two second holes are located on both sides of the first hole. The two first leads pass through the first hole and are electrically connected to two of the four pads. The two second leads pass through the two second holes and are electrically connected to the other two of the four pads.

13. The photovoltaic module according to claim 12, characterized in that, The first hole is a rectangular hole, two of the four pads are located on opposite sides of the first hole, the two second holes are located on the other opposite sides of the first hole, and the other two pads are located on the side of the corresponding second hole away from the center of the first hole.

14. The photovoltaic module according to claim 11, characterized in that, The four pads are arranged in a central position, and the two diodes are located on both sides of the four pads.

15. The photovoltaic module according to claim 12, characterized in that, The junction box is provided with a first electrical connection piece, a second electrical connection piece, and a third electrical connection piece. One of the two diodes is electrically connected to the first electrical connection piece and the second electrical connection piece, and the other of the two diodes is electrically connected to the second electrical connection piece and the third electrical connection piece.

16. The photovoltaic module according to claim 15, characterized in that, Two of the four pads are located on the second electrical connection piece, and the other two of the four pads are located on the first electrical connection piece and the third electrical connection piece, respectively.

17. The photovoltaic module according to claim 16, characterized in that, The first electrical connector includes a first connecting segment and a second connecting segment that are connected to each other. The first connecting segment extends along the length direction of the junction box, and the second connecting segment extends along the width direction of the junction box. The second electrical connector is disposed between the first electrical connector and the third electrical connector. The second electrical connector includes an electrical connector body and two connecting portions, which are respectively connected to both sides of the electrical connector body. Two of the four solder pads are disposed on the electrical connector body. The third electrical connector includes a third connecting segment and a fourth connecting segment. The third connecting segment extends along the length of the junction box, and the fourth connecting segment extends along the width of the junction box. The other two of the four solder pads are respectively located on the second connecting segment and the fourth connecting segment. One of the two diodes is disposed on one of the two connection portions, and the pin of the one of the two diodes is electrically connected to the first connection segment. The other of the two diodes is disposed on the fourth connection segment, and the pin of the other of the two diodes is electrically connected to the other of the two connection portions.

18. The photovoltaic module according to claim 1, characterized in that, An insulating layer is provided between the jumper and the battery cell group.

19. The photovoltaic module according to claim 18, characterized in that, The insulating layer includes a first insulating segment and a second insulating segment. The first insulating segment is disposed between two first battery strings and extends along the string arrangement direction of the plurality of battery cells in the first battery string. The second insulating segment is disposed between two second battery strings and extends along the string arrangement direction of the plurality of battery cells in the second battery string.

20. The photovoltaic module according to claim 18, characterized in that, One end of the insulating layer is located at the end of the first battery string away from the second battery string, and the other end of the insulating layer extends along the string arrangement direction of the multiple battery cells in the same battery cell group to the end of the second battery string away from the first battery string.

21. The photovoltaic module according to claim 20, characterized in that, At least one of the battery cell groups comprises a plurality of battery cells forming a battery cell array, the length of the insulating layer is greater than the length of the battery cell array and less than the distance between the first connection point and the second connection point, and the width of the insulating layer is greater than the width of the jumper wire.

22. The photovoltaic module according to claim 1, characterized in that, The two first leads are in contact with each other.

Images