Photovoltaic panels

Abstract

The present invention discloses a photovoltaic module, comprising at least one battery string section, the battery string section comprising a plurality of battery string groups connected in series, the plurality of battery string groups comprising a first battery string group and at least one second battery string group, the first battery string group comprising a first battery string, the first battery string comprising a plurality of first battery cells connected in series, the plurality of first battery cells being arranged in two columns, the second battery string group comprising two second battery strings connected in parallel, each second battery string comprising a plurality of second battery cells connected in series, the number of second battery cells in each second battery string being twice the number of first battery cells in the first battery string. The photovoltaic module according to the present invention reduces power loss of the photovoltaic module, increases power output of the photovoltaic module, reduces processing difficulty of the photovoltaic module, and improves production efficiency of the photovoltaic module.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic technology, and in particular to a photovoltaic component. Background Art

[0002] Photovoltaic is the abbreviation of solar photovoltaic power generation system. It is a new power generation system that uses the photovoltaic effect of photovoltaic cell semiconductor materials to directly convert solar radiation energy into electrical energy. It has two modes of operation: independent operation and grid-connected operation.

[0003] In related technologies, multiple cell cutting (for example, a two-in-two circuit design) is an effective solution for increasing the power of photovoltaic modules. When connecting strings of cells with different layouts and designs in a photovoltaic module, jumpers are often required to ensure current flow when some cells are blocked. However, the presence of jumpers results in significant power loss in the photovoltaic module and increases the complexity of the manufacturing process. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a photovoltaic module that reduces power loss, increases the power output of the photovoltaic module, reduces the difficulty of processing the photovoltaic module, and improves the production efficiency of the photovoltaic module.

[0005] According to an embodiment of the present invention, a photovoltaic module includes: at least one battery string portion, the battery string portion includes a plurality of battery string groups connected in series, the plurality of battery string groups include a first battery string group and at least one second battery string group, the first battery string group includes a first battery string, the first battery string includes a plurality of first battery cells connected in series, the plurality of first battery cells are arranged in two columns, the second battery string group includes two second battery strings connected in parallel, each of the second battery strings includes a plurality of second battery cells connected in series, and the number of second battery cells in each second battery string is twice the number of the first battery cells in a single column in each of the first battery strings.

[0006] The photovoltaic module of the present invention eliminates other conductive components (such as jumpers), thereby reducing power losses in the cell string, increasing the power output of the photovoltaic module, improving its power generation capacity, and enhancing its performance. Furthermore, it reduces the complexity of the cell string production process and improves the production efficiency of the photovoltaic module.

[0007] According to some embodiments of the present invention, the first battery cell is a 1 / N battery cell cut from a complete battery cell, and the second battery cell is a 1 / 2N battery cell cut from the complete battery cell, where N is a natural number greater than or equal to 2.

[0008] According to some embodiments of the present invention, the first cell is a half cell cut from a full cell, and the second cell is a quarter cell cut from the full cell.

[0009] According to some embodiments of the present invention, a plurality of the battery string groups are arranged along a first direction, there are two battery string sections, the two battery string sections are arranged along a second direction, the two second battery string groups of the two battery string sections that are opposite to each other along the second direction are connected in parallel, the two first battery string groups of the two battery string sections that are opposite to each other along the second direction are connected in parallel, and the first direction and the second direction are perpendicular to each other.

[0010] According to some embodiments of the present invention, the photovoltaic module further includes a first bus bar, which is located at one end of the battery string group close to the center of the photovoltaic module, and the two battery string parts are symmetrically arranged about the first bus bar, and the first battery string group and the second battery string group of the two battery string parts are respectively connected to the first bus bar.

[0011] According to some embodiments of the present invention, the photovoltaic assembly further includes a first diode, the first diode is electrically connected to the first bus bar, and the first diode is connected in reverse parallel to the two first battery strings symmetrically arranged along the second direction.

[0012] According to some embodiments of the present invention, there are two second battery string groups, the plurality of second battery cells of the second battery string are arranged along the second direction, and the first battery string group is located on one side of the two second battery string groups along the first direction.

[0013] According to some embodiments of the present invention, the photovoltaic assembly further includes: a second diode, the second diode being electrically connected to the first bus bar, and the second diode being connected in reverse parallel to the two second battery strings.

[0014] According to some embodiments of the present invention, the photovoltaic assembly further comprises: a second bus bar, the second bus bar being located at an end of the battery string group away from the center of the photovoltaic assembly, and two second battery string groups being connected in series via the second bus bar.

[0015] According to some embodiments of the present invention, the photovoltaic assembly further includes: a third bus bar, the two ends of which are respectively electrically connected to the second bus bar and the first bus bar located between the two second battery string groups; two third diodes, the third diodes are electrically connected to the first bus bar, and any one of the two third diodes is reverse-parallel connected to the two second battery string groups symmetrically arranged along the second direction.

[0016] According to some embodiments of the present invention, the width of the third bus bar is W0, wherein W0 satisfies: 3mm≤W0≤8mm.

[0017] According to some embodiments of the present invention, the number of the first battery cells in each column is N1, wherein N1 satisfies: 8≤N1≤12; and / or the number of the second battery cells in each second battery string is N2, wherein N2 satisfies: 16≤N2≤24.

[0018] According to some embodiments of the present invention, the sum of the number of the second battery cells is four times the sum of the number of the first battery cells.

[0019] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0021] Figure 1 is a schematic diagram of a circuit design of a photovoltaic module according to an embodiment of the present invention;

[0022] Figure 2 is a schematic diagram of a circuit design of a photovoltaic module according to another embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of a photovoltaic module according to another embodiment of the present invention.

[0024] Reference numerals:

[0025] 100. Photovoltaic modules;

[0026] 1. Battery string unit; 11. Battery string group;

[0027] 12. First battery string group; 121. First battery string; 1211. First battery cell;

[0028] 13. Second battery string group; 131. Second battery string; 1311. Second battery cell;

[0029] 2. First bus bar; 3. Second bus bar;

[0030] 4. First diode; 5. Second diode;

[0031] 6. Third bus bar; 7. Third diode; 8. Fourth diode. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 3 A photovoltaic assembly 100 according to an embodiment of the present invention is described.

[0033] like Figure 1 and Figure 3 As shown, a photovoltaic assembly 100 according to an embodiment of the present invention includes at least one cell string 1 .

[0034] Specifically, the battery string unit 1 includes a plurality of battery string groups 11 connected in series. The plurality of battery string groups 11 include a first battery string group 12 and at least one second battery string group 13. The first battery string group 12 includes a first battery string 121. The first battery string 121 includes a plurality of first battery cells 1211 connected in series. The plurality of first battery cells 1211 are arranged in two columns. The second battery string group 13 includes two second battery strings 131 connected in parallel. Each second battery string 131 includes a plurality of second battery cells 1311 connected in series. The number of second battery cells 1311 in each second battery string 131 is twice the number of first battery cells 1211 in a single column in the first battery string 121. In the description of the present invention, "plurality" means two or more.

[0035] For example, in Figure 1 and Figure 3 In the example, the first battery string group 12 and the second battery string group 13 are connected in series to form a battery string part 1. The multiple first battery cells 1211 in the first battery string group 12 are arranged in two rows along the left-right direction, and the two parallel second battery strings 131 in the second battery string group 13 are also arranged along the left-right direction. That is, in Figure 1 In the example shown in FIG5 , the two columns of second battery strings 131 on the left are connected in parallel, and the two columns of multiple first battery cells 1211 on the right are connected in series.

[0036] In conventional technology, a photovoltaic module includes multiple cell strings connected in series. Each cell string includes two parallel columns of cells, each column containing multiple cells connected in series, with a jumper wire placed between adjacent cell strings. With this arrangement, a first cell string group 12 includes a first cell string 121, with multiple first cells 1211 in the first cell string 121 connected in series and arranged in two columns. This allows current to flow directly between the first cell string 121 and the second cell string 131, eliminating the need for a jumper wire between the first cell string group 12 and the second cell string group 13. This eliminates the need for a jumper wire, thereby reducing power losses caused by current passing through other conductive components (such as jumpers), lowering power losses within the cell string unit 1, and increasing the power output, power generation capacity, and performance of the photovoltaic module 100. Furthermore, this reduces the processing required for processing other conductive components, thereby simplifying the process of connecting these components to the multiple cell strings 11. This reduces the complexity of the cell string unit 1 production process, thereby improving the production efficiency of the photovoltaic module 100.

[0037] In addition, by setting the number of second battery cells 1311 in each second battery string 131 to twice the number of single-column first battery cells 1211 in the first battery string 121, it is effectively ensured that the circuits (such as current and voltage) of the first battery string group 12 and the second battery string group 13 in the battery string portion 1 remain consistent. The first battery string group 12 and the second battery string group 13 are adapted to each other when connected in series, thereby ensuring the performance of the photovoltaic module 100.

[0038] The photovoltaic module 100 according to the present invention eliminates other conductive components (such as jumpers), thereby reducing power loss in the cell string 1, increasing the power output of the photovoltaic module 100, improving the power generation capability of the photovoltaic module 100, and enhancing the performance of the photovoltaic module 100. Furthermore, the manufacturing process difficulty during the production of the cell string 1 is reduced, thereby improving the production efficiency of the photovoltaic module 100.

[0039] According to some embodiments of the present invention, referring to Figure 3 The first cell 1211 is a one-Nth cell cut from a complete cell, and the second cell 1311 is a one-2Nth cell cut from a complete cell, where N is a natural number greater than or equal to 2.

[0040] For example, in Figure 3 In the example, the first battery cell 1211 and the second battery cell 1311 are cut from a complete battery cell of the same size into small batteries of different sizes. For example, if the lengths of the first battery cell 1211 and the second battery cell 1311 (e.g., the length along the left and right directions) are the same, the width of the second battery cell 1311 (i.e., the width along the left and right directions) is the same as that of the first battery cell 1211. Figure 1The width in the vertical direction of the first battery cell 1211 is the width of the first battery cell 1211 along the vertical direction of the first battery cell 1211. Figure 1 This arrangement effectively ensures that the length of a single row of multiple first solar cells 1211 (i.e., the total vertical length of the single row of multiple first solar cells 1211) is the same as the length of a single string of second solar cells 131 (i.e., the vertical length of the second solar cell string 131). This further ensures the uniformity of the length of the battery string portion 1 comprising the first and second solar cell strings 12, 13. It also ensures that the effective utilization area of ​​the single row of multiple first solar cells 1211 is the same as that of the second solar cell string 131, thus ensuring compatibility between the first and second solar cell strings 12, 13 and improving the performance and normal operation of the photovoltaic module 100. Furthermore, it ensures that the current and voltage of the first and second solar cell strings 12, 13 are consistent, eliminating the need for other conductive components (e.g., jumpers) when connecting the first and second solar cell strings 12, 13, significantly reducing power loss in the photovoltaic module 100. In addition, cutting the complete cell will reduce the current, reduce the thermal loss of the cell string 1, and also increase the power of the photovoltaic module 100.

[0041] According to some embodiments of the present invention, referring to Figure 3 The first cell 1211 is a half cell cut from a full cell, and the second cell 1311 is a quarter cell cut from a full cell.

[0042] For example, the first cell 1211 is a two-cell battery obtained by cutting from a complete cell, and the second cell 1311 is a four-cell battery obtained by cutting from a complete cell. The current of the first cell 1211 is twice that of the second cell 1311, and the area of ​​the first cell 1211 is twice that of the second cell 1311. This arrangement makes it easier to cut the complete cell into the first cell 1211, reducing the difficulty of forming the first cell 1211, thereby improving the production efficiency of the first cell 1211 and, consequently, the production efficiency of the first cell string 12. Moreover, given the limited length of the first cell string 12, the distance between two adjacent first cell cells 1211 is large, facilitating the arrangement of the first cell cells 1211 and the production of the first cell string 12. Furthermore, the second cell 1311 is one-fourth of the complete cell, and its width is smaller, effectively reducing the current of the second cell 1311, thereby reducing thermal losses in the second cell 1311 and thereby increasing power.

[0043] According to some embodiments of the present invention, referring to Figure 1 and Figure 3 , multiple battery string groups 11 are arranged along a first direction (such as Figure 1 There are two battery strings 1, and the two battery strings 1 are arranged along the second direction (as shown in the left and right directions). Figure 1 The two second battery string groups 13 of the two battery string parts 1 that are opposite to each other along the second direction are connected in parallel, and the two first battery string groups 12 of the two battery string parts 1 that are opposite to each other along the second direction are connected in parallel, and the first direction and the second direction are perpendicular to each other.

[0044] For example, in Figure 1 and Figure 3 In the example, the first battery string group 12 and the second battery string group 13 are arranged in the left-right direction. The two battery string sections 1 are arranged in the up-down direction. The two second battery string groups 13 that are opposite to each other in the up-down direction in the two battery string sections 1 are connected in parallel, and the two first battery string groups 12 that are opposite to each other in the up-down direction in the two battery string sections 1 are connected in parallel. With this arrangement, the photovoltaic module 100 includes two battery string sections 1, which increases the illuminated area of ​​the photovoltaic module 100, thereby increasing the power generation of the photovoltaic module 100 and improving the performance of the photovoltaic module 100. Specifically, when the cells in a single battery string section 1 are blocked, causing the current flow path of the blocked cell to be abnormal, the other battery string section 1 can still be used normally, thereby maintaining a high current collection and conversion capacity of the photovoltaic module 100 and significantly reducing the current loss of the photovoltaic module 100. However, it should be noted that the number and arrangement of the battery string sections 1 and battery string groups 11 can be specifically set according to actual usage to meet actual needs.

[0045] According to some embodiments of the present invention, Figure 1 and Figure 3 In the example, the photovoltaic module 100 also includes a first bus bar 2, which is located at one end of the battery string group 11 close to the center of the photovoltaic module 100, and the two battery string parts 1 are symmetrically arranged about the first bus bar 2, and the first battery string group 12 and the second battery string group 13 of the two battery string parts 1 are respectively connected to the first bus bar 2.

[0046] For example, in Figure 1 and Figure 3In the example, two battery strings 1 are located above and below a first bus bar 2, and the two battery strings 1 are symmetrically arranged vertically about the first bus bar 2. Multiple battery string groups 11 in the two battery strings 1 are each connected to the first bus bar. That is, the photovoltaic module 100 includes two battery strings 1, one of which is located above the first bus bar 2 and the other below it. The two battery strings 1 share the first bus bar 2. Two first battery string groups 12 facing each other vertically are connected in parallel via the first bus bar 2, and two second battery string groups 13 facing each other vertically are connected in parallel via the first bus bar 2. Adjacent first battery string groups 12 and second battery string groups 13 located on the same side of the first bus bar 2 are connected in series via the first bus bar 2. This arrangement allows the two battery strings 1 to share the first bus bar 2, facilitating parallel connection of the two opposing first battery string groups 12 and the two opposing second battery string groups 13, thus facilitating connection and improving installation efficiency. Furthermore, the utilization rate of the first bus bar 2 is also improved.

[0047] According to some embodiments of the present invention, referring to Figure 1 The photovoltaic assembly 100 further includes a first diode 4, the first diode 4 being electrically connected to the first bus bar 2, and the first diode 4 being reversely connected in parallel along the second direction (eg Figure 1 Two first battery string groups 12 are symmetrically arranged in the upper and lower directions (as shown).

[0048] For example, in Figure 1 In the example shown, the first diode 4 is connected in reverse parallel to the two first battery string groups 12 symmetrically arranged in the vertical direction in the two battery string sections 1. With this arrangement, the first diode 4 protects the first battery string 121. Current sequentially passes through the multiple first battery cells 1211 in the first battery string 121, preventing current from flowing directly out along the first bus bar 2 when passing through the first battery string group 12, thereby ensuring that the first battery string group 12 can be used normally for a long time. Furthermore, the first diode 4 simultaneously protects the first cell string groups 12 in both cell string sections 1, that is, the first diode 4 can protect two first cell strings 121 that are opposed to each other in the vertical direction. When one of the first cell cells 1211 in the first cell string 121 located above the first bus bar 2 is damaged, current can flow through the first diode 4 to the second cell string 131. Simultaneously, the first cell string 121 located below the first bus bar 2 can function normally, ensuring normal current collection and convergence, and ensuring normal functioning of the second cell string 131 and the first cell string 121 located below the first bus bar 2. This extends the service life of the photovoltaic module 100 and improves its performance and photoelectric conversion efficiency. The photovoltaic module 100 further includes a first junction box (not shown). The first junction box is disposed on the back of the photovoltaic module 100, opposite the first bus bar 2, and the first diode 4 is disposed within the first junction box.

[0049] According to some embodiments of the present invention, referring to Figure 1 There are two second battery string groups 13, and the plurality of second battery cells 1311 of the second battery string 131 are arranged along the second direction (eg Figure 1 In the up-down direction shown in FIG, the first battery string group 12 is located on one side of the two second battery string groups 13 along the first direction.

[0050] For example, in Figure 1 In the example, the two second battery string groups 13 are arranged in the left-right direction, and the multiple second battery cells 1311 in the second battery string group 13 are arranged in sequence in the up-down direction. The first battery string group 12 is located on the right side of the two second battery string groups 13. In this arrangement, the first battery string group 12 is located on one side of the two second battery string groups 13, which facilitates the connection of the two second battery string groups 13 in series and then in series with the first battery string group 12, thereby avoiding connection errors when connecting multiple battery string groups 11, thereby facilitating the production of the battery string part 1. In addition, setting the second battery string group 13 to two not only increases the power generation of the battery string part 1, but also ensures that the thermal loss of the battery string part 1 is low, thereby improving the performance of the battery string part 1. In addition, the reasonable arrangement of the first battery string group 12 and the second battery string group 13 improves the surface utilization rate of the photovoltaic module 100 and increases the power generation of the photovoltaic module 100.

[0051] According to some embodiments of the present invention, referring to Figure 1 The photovoltaic assembly 100 further includes a second diode 5, which is electrically connected to the first bus bar 2 and is connected in reverse parallel to at least two second battery strings 13. Figure 1 In the example shown, the second diode 5 is connected in antiparallel between two adjacent second battery strings 13. Current flows from the positive electrode to the negative electrode within the photovoltaic module 100. The following uses the battery string 1 above the first bus bar 2 as an example to describe the current flow direction. During normal operation of the photovoltaic module 100, the current flow paths of the two battery strings 1 are symmetrical about the first bus bar 2.

[0052] Reference Figure 1 , showing the current flow path of the photovoltaic module 100 during normal use. After starting from the positive electrode, the current flows along the first bus bar 2 to the second battery string group 13 on the left, flows upward, then flows into the second battery string group 13 on the right, flows downward, and then flows along the first bus bar 2 to a column of multiple first battery cells 1211 on the left side of the first battery string 121 and another column of multiple first battery cells 1211 on the right side of the first battery string 121, and then flows along the first bus bar 2 to the negative electrode.

[0053] In the photovoltaic module 100, one of the second cells 1311 in the cell string 1 on the upper side of the first bus bar 2 is damaged (e.g. Figure 1 When the second battery cell 1311 indicated by the dotted box indicated by the arrow A is damaged, refer to Figure 1 When one of the second battery cells 1311 is damaged, the current flow path is as follows: starting from the positive electrode, the current flows along the first bus bar 2 directly to the right second battery string 131 in the left second battery string group 13, flows upward, then flows into the right second battery string group 13, flows downward, and then flows along the first bus bar 2 in sequence to the left column of multiple first battery cells 1211 in the first battery string 121 and the right column of multiple first battery cells 1211 in the first battery string 121, and then flows along the first bus bar 2 to the negative electrode. The current in the battery string portion 1 below the first bus bar 2 flows normally, that is, the battery string portion 1 below the first bus bar 2 is in normal use.

[0054] In the photovoltaic module 100, one second cell 1311 in each of the two second cell strings 131 in the cell string portion 1 on the upper side of the first bus bar 2 is damaged (e.g., Figure 1 When the two second battery cells 1311 indicated by the dotted box indicated by the arrow B are damaged), the two second battery strings 131 in the second battery string group 13 on the right are connected in series. Figure 1 When the two second battery cells 1311 are damaged, the current flow path is as follows: starting from the positive electrode, the current flows along the first bus bar 2 through the second diode 5, and then flows sequentially to the second battery string 131 on the left side of the right second battery string group 13 and the second battery string 131 on the right side of the right second battery string group 13. Then, the current flows along the first bus bar 2 to the first battery string 1211 on the left side and the first battery string 1211 on the right side, and then flows along the first bus bar 2 to the negative electrode. The current in the battery string 1 below the first bus bar 2 is flowing normally, that is, the battery string 1 below the first bus bar 2 is in normal use.

[0055] With this arrangement, the second diode 5 protects the two second battery strings 13. Even if the second battery cell 1311 in one second battery string 13 is damaged, the other second battery string 13 can still function normally, ensuring ease of use. Furthermore, the second diode 5 also protects the two second battery strings 13 in the battery string portion 1 below the first bus bar 2. Furthermore, the two second battery strings 13 arranged in the left and right directions are protected by a single second diode 5, reducing the material consumption of the second diode 5, simplifying the installation difficulty of the photovoltaic module 100, and improving production efficiency. The photovoltaic module 100 also includes a second junction box (not shown). The second junction box is disposed on the back of the photovoltaic module 100. The second junction box's orthogonal projection can be positioned between the two second battery strings 13 arranged in the left and right directions. The second junction box is opposite the first bus bar 2, and the second diode 5 is disposed within the second junction box.

[0056] According to some embodiments of the present invention, referring to Figure 1 and Figure 3 The photovoltaic module 100 further includes a second bus bar 3 , which is located at one end of the battery string group 11 away from the center of the photovoltaic module 100 , and the two second battery string groups 13 are connected in series via the second bus bar 3 .

[0057] For example, in Figure 1 and Figure 3 In the example, both ends of the second bus bar 3 are respectively connected to the end of the second battery string group 13 away from the first bus bar 2. Two second bus bars 3 are provided, respectively provided in the two battery string parts 1. In the following description, the battery string part 1 in the upper part of the photovoltaic module 100 is used as an example. The first bus bar 2 is located at the lower end of the battery string group 11, that is, the first bus bar 2 is respectively connected to the lower ends of the first battery string group 12 and the two second battery string groups 13. The second bus bar 3 is located at the upper end of the battery string group 11, and the two ends of the second bus bar 3 in the left and right directions are respectively connected to the two battery string groups 11.

[0058] In this arrangement, the first battery string group 12 and the adjacent second battery string group 13 are connected in series through the first bus bar 2, and the two adjacent second battery string groups 13 are connected through the second bus bar 3, so that current can flow between the first battery string group 12 and the adjacent second battery string group 13, and between the second battery string group 13 and the adjacent second battery string group 13, thereby facilitating the output of the current on the battery string part 1 for subsequent use.

[0059] According to other embodiments of the present invention, Figure 2 The photovoltaic assembly 100 further includes a third bus bar 6 and two third diodes 7 .

[0060] Specifically, both ends of the third bus bar 6 are electrically connected to the second bus bar 3 and the first bus bar 2 located between the two second battery string groups 13. The third diode 7 is electrically connected to the first bus bar 2, and either of the two third diodes 7 is connected in reverse parallel along the second direction (such as Figure 2 Two second battery string groups 13 are symmetrically arranged in the upper and lower directions (as shown).

[0061] For example, in Figure 2In the example shown in FIG1 , the upper end of the third bus bar 6 is electrically connected to the second bus bar 3, and the lower end of the third bus bar 6 is electrically connected to the first bus bar 2 located between the two second battery string groups 13 in the left-right direction. One of the two third diodes 7 is connected in reverse parallel between the two second battery string groups 13 symmetrically arranged in the vertical direction on the left, and one of the third diodes 7 is connected in reverse parallel between the third bus bar 6 arranged in the horizontal direction and the second battery string group 13 on the left. The other of the two third diodes 7 is connected in reverse parallel between the two second battery string groups 13 symmetrically arranged in the vertical direction on the right, and the other third diode 7 is connected in reverse parallel between the third bus bar 6 arranged in the horizontal direction and the second battery string group 13 on the right.

[0062] The photovoltaic module 100 includes a third junction box (not shown), one end of the third bus bar 6 is connected to the third junction box provided with a third diode 7, and two third diodes 7 are installed in the third junction box. The third junction box is located on the back of the photovoltaic module 100 and is opposite to the first bus bar 2 and the third bus bar 6. In other words, the combination Figure 1 The second diode 5 is provided with a second diode 5, which is provided in the second junction box. The second diode 5 simultaneously protects a total of four second battery strings 13 on both sides of the first bus bar 2. Figure 2 In the example, the left third diode 7 of the two third diodes 7 is used to protect the two second battery strings 13 located on the left side and the upper and lower sides of the first bus bar 2, respectively. The right third diode 7 of the two third diodes 7 is used to protect the Figure 2 The two second battery strings 13 shown in the middle, located on the upper and lower sides of the first busbar 2, and the two third diodes 7 are located in the same third junction box. Furthermore, the two third diodes 7, while ensuring protection for the corresponding second battery strings 13, only require one third junction box. This reduces the number of third junction boxes, further facilitating the arrangement of components on the photovoltaic module 100 and simplifying the wiring layout of the photovoltaic module 100.

[0063] The following describes the direction of current flow during operation, using the cell string 1 at the top of a photovoltaic module 100 as an example. During normal operation of the photovoltaic module 100, the current flow paths of the two cell strings 1 are symmetrical about the first bus bar 2. If the first cell 1211 or the second cell 1311 in one of the two cell strings 1 is damaged, the other cell string 1 can function normally. The photovoltaic module 100 is provided with a third bus bar 6 and two third diodes 7. The photovoltaic module 100 will be described using an exemplary embodiment.

[0064] The photovoltaic module 100 is provided with a third bus bar 6 and two third diodes 7, referring to Figure 2The current flow path of the photovoltaic module 100 during normal use is as follows: after starting from the positive electrode, the current flows along the first bus bar 2 to the second battery string group 13 on the left, flows upward, then flows along the second bus bar 3 into the second battery string group 13 on the right, flows downward, and then flows along the first bus bar 2 in sequence to a column of multiple first battery cells 1211 on the left side of the first battery string 121 and another column of multiple first battery cells 1211 on the right side of the first battery string 121, and then flows along the first bus bar 2 to the negative electrode.

[0065] In the photovoltaic module 100, one of the second cells 1311 is damaged (e.g. Figure 2 When the second battery cell 1311 indicated by the dotted box indicated by the arrow C is damaged, refer to Figure 2 When one of the second battery cells 1311 is damaged, the current flow path is as follows: starting from the positive electrode, the current flows along the first bus bar 2 through one of the third diodes 7 (i.e., the third diode 7 on the left), and then flows along the third bus bar 6 and the second bus bar 3 in sequence to the second battery string group 13 on the right, flows downward, and then flows along the first bus bar 2 in sequence to the first battery string 121 in a column of multiple first battery cells 1211 on the left and another column of multiple first battery cells 1211 on the right in the first battery string 121, and then flows along the first bus bar 2 to the negative electrode.

[0066] With this arrangement, the two third diodes 7 protect the two second cell strings 13. Even if the second cell 1311 in one of the second cell strings 13 is damaged, the other second cell string 13 along the third bus bar 6 can still function normally, extending the service life of the cell string 1. Furthermore, the third diode 7 also protects the two second cell strings 13 in the lower cell string 1 of the photovoltaic module 100, improving the performance of the photovoltaic module 100. When the number of first cell 1211 and second cell 1311 is small, or the risk of hot spots in the cell string 1 is low, the third bus bar 6 can be removed, and only one third diode 7 is required between the two second cell strings 13. It should be noted that the two cell strings 1 respectively include two second cell strings 13 and a first cell string 12 connected in series via the second bus bar 3. The first cell string 12 includes a first cell string 121 formed by a plurality of first cell 1211 in series, and the second cell string 13 includes two second cell strings 131 connected in parallel. The current flow path on one of the battery strings 1 is symmetrical with the current flow path on the other battery string 1 in the vertical direction, that is, the current flow paths of the two battery strings 1 are symmetrical in the vertical direction.

[0067] According to some embodiments of the present invention, referring to Figure 1 , the width of the third bus bar 6 is W0, where W0 satisfies: 3mm≤W0≤8mm. Figure 1In the example, the width of the third busbar 6 along the left-right direction is W0. When the width of the third busbar 6 is less than 3 mm, the resistance of the third busbar 6 is high, reducing its conductivity and thus affecting its usability. When the width of the third busbar 6 is greater than 8 mm, the width of the third busbar 6 is large, increasing the area occupied by the third busbar 6, making it more difficult to arrange the multiple second battery cells 1311 and the multiple first battery cells 1211 along the left-right direction, and reducing production efficiency. Therefore, by setting the width W0 of the third busbar 6 to meet the following conditions: 3 mm ≤ W0 ≤ 8 mm, the third busbar 6 is properly arranged, the resistance of the third busbar 6 is reduced, and the conductivity of the third busbar 6 is improved, making it easier to use. In addition, the difficulty of arranging the multiple second battery cells 1311 and the multiple first battery cells 1211 along the left-right direction is reduced, improving production efficiency. In particular, both battery strings 1 include a third busbar 6.

[0068] According to some embodiments of the present invention, the number of the plurality of first battery cells 1211 in each column is N1, where N1 satisfies: 8 ≤ N1 ≤ 12; and / or the number of the second battery cells 1311 in each second battery string 131 is N2, where N2 satisfies: 16 ≤ N2 ≤ 24. For example, the configurations of the plurality of first battery cells 1211 in each column and each second battery string 131 include the following: First, the number of the plurality of first battery cells 1211 in each column is N1, where N1 satisfies: 8 ≤ N1 ≤ 12. Second, the number of the second battery cells 1311 in each second battery string 131 is N2, where N2 satisfies: 16 ≤ N2 ≤ 24. Third, the number of the plurality of first battery cells 1211 in each column is N1, and the number of the second battery cells 1311 in each second battery string 131 is N2, where N1 and N2 respectively satisfy: 8 ≤ N1 ≤ 12 and 16 ≤ N2 ≤ 24.

[0069] With such a configuration, the number of the plurality of first battery cells 1211 in each column and the number of the second battery cells 1311 in each second battery string 131 are rationalized, thereby rationalizing the length of the photovoltaic module 100 in the up and down directions, which not only increases the power generation of the photovoltaic module 100, but also reduces the production difficulty of the photovoltaic module 100, thereby improving the production efficiency of the photovoltaic module 100.

[0070] According to some embodiments of the present invention, the sum of the number of the plurality of second battery cells 1311 is four times the sum of the number of the plurality of first battery cells 1211. For example, in the battery string unit 1, the sum of the number of the plurality of second battery cells 1311 is four times the sum of the number of the plurality of first battery cells 1211, thereby matching the circuit parameters of the two second battery string groups 13 in the battery string unit 1 with the circuit parameters of the first battery string group 12, facilitating subsequent use.

[0071] According to some embodiments of the present invention, referring to Figure 3 The width of the first battery cell 1211 is W1, and the length of the first battery cell 1211 is L1, where W1 and L1 respectively satisfy: 90 mm ≤ W1 ≤ 105.5 mm, 182 mm ≤ L1 ≤ 211 mm; and / or the width of the second battery cell 1311 is W2, and the length of the second battery cell 1311 is L2, where W2 and L2 respectively satisfy: 45.5 mm ≤ W2 ≤ 52.75 mm, 182 mm ≤ L2 ≤ 211 mm. For example, the configuration of the first battery cell 1211 and the second battery cell 1311 includes the following situations: First, the width of the first battery cell 1211 is W1, and the length of the first battery cell 1211 is L1, where W1 and L1 respectively satisfy: 90 mm ≤ W1 ≤ 105.5 mm, 182 mm ≤ L1 ≤ 211 mm. Second, the width of the second battery cell 1311 is W2, and the length of the second battery cell 1311 is L2, where W2 and L2 respectively satisfy: 45.5mm≤W2≤52.75mm, 182mm≤L2≤211mm. Third, the width of the first battery cell 1211 is W1, and the length of the first battery cell 1211 is L1. The width of the second battery cell 1311 is W2, and the length of the second battery cell 1311 is L2, where W1, L1, W2, and L2 respectively satisfy: 90mm≤W1≤105.5mm, 182mm≤L1≤211mm, 45.5mm≤W2≤52.75mm, and 182mm≤L2≤211mm.

[0072] With such a configuration, the size of the first cell 1211 and the size of the second cell 1311 are reasonably configured and easy to control and obtain, thereby improving the production efficiency of the first cell 1211 and the second cell 1311, thereby improving the production efficiency of the cell string 1, and further improving the production efficiency of the photovoltaic module 100.

[0073] According to some embodiments of the present invention, referring to Figure 3 The distance between two adjacent first battery cells 1211 in the first battery string 121 is D1, where D1 satisfies: -0.5 mm ≤ D1 ≤ 1.0 mm.

[0074] For example, in Figure 3In the example, the spacing between two adjacent first battery cells 1211 arranged in the horizontal direction is D1, and the spacing between two adjacent first battery cells 1211 arranged in the vertical direction is also D1. When the spacing between two adjacent first battery cells 1211 in the first battery string 121 is less than -0.5 mm, the overlapping area between the two adjacent first battery cells 1211 is large, reducing the power generation of the first battery string group 12. When the spacing between two adjacent first battery cells 1211 in the first battery string 121 is greater than 1.0 mm, the spacing between the two adjacent first battery cells 1211 is large, increasing the difficulty of arranging the multiple second battery cells 1311 and the multiple first battery cells 1211. Therefore, by setting the spacing D1 between two adjacent first battery cells 1211 in the first battery string 121 to satisfy the following relationship: -0.5 mm ≤ D1 ≤ 1.0 mm, the spacing between the two adjacent first battery cells 1211 is reasonably set, reducing the overlapping area between the two adjacent first battery cells 1211, thereby reducing the obstruction area and improving the power generation of the first battery string 12. In addition, reducing the spacing between two adjacent first battery cells 1211 reduces the difficulty of arranging the multiple second battery cells 1311 and the multiple first battery cells 1211, thereby improving the production efficiency of the battery string 1.

[0075] According to other embodiments of the present invention, Figure 3 The distance between two adjacent second battery cells 1311 in the second battery string 131 is D2, where D2 satisfies: -0.5 mm ≤ D2 ≤ 1.0 mm.

[0076] For example, in Figure 3In the example, the spacing between two adjacent second battery cells 1311 arranged in the horizontal direction is D2, and the spacing between two adjacent second battery cells 1311 arranged in the vertical direction is also D2. When the spacing between two adjacent second battery cells 1311 in the second battery string 131 is less than -0.5 mm, the overlapping area between the two adjacent second battery cells 1311 is large, reducing the power generation of the second battery string group 13. When the spacing between two adjacent second battery cells 1311 in the second battery string 131 is greater than 1.0 mm, the spacing between the two adjacent second battery cells 1311 is large, increasing the difficulty of arranging the multiple second battery cells 1311 and the multiple first battery cells 1211. Therefore, by setting the spacing D2 between two adjacent second battery cells 1311 in the second battery string 131 to meet the following conditions: -0.5 mm ≤ D2 ≤ 1.0 mm, the spacing between the two adjacent second battery cells 1311 is reasonably set, reducing the overlapping area between the two adjacent second battery cells 1311, thereby reducing the obstruction area and improving the power generation of the second battery string 13. In addition, reducing the spacing between two adjacent second battery cells 1311 reduces the difficulty of arranging the multiple second battery cells 1311 and the multiple first battery cells 1211, thereby improving the production efficiency of the battery string 1.

[0077] According to further embodiments of the present invention, the spacing between two adjacent first battery cells 1211 in the first battery string 121 is D1, and the spacing between two adjacent second battery cells 1311 in the second battery string 131 is D2, where D1 and D2 respectively satisfy: -0.5mm≤D1≤1.0mm, -0.5mm≤D2≤1.0mm. Thus, the spacing between two adjacent first battery cells 1211 and the spacing between two adjacent second battery cells 1311 are reasonably set, reducing the overlapping area between two adjacent first battery cells 1211 in the first battery string 121 and the overlapping area between two adjacent second battery cells 1311 in the second battery string 131, thereby reducing the obstruction area and increasing the power generation of the battery string portion 1. In addition, the interval between two adjacent first battery cells 1211 in the first battery string 121 is reduced, and the interval between two adjacent second battery cells 1311 in the second battery string 131 is reduced, which reduces the difficulty of arranging the multiple second battery cells 1311 and the multiple first battery cells 1211, thereby improving the production efficiency of the battery string part 1.

[0078] According to some embodiments of the present invention, the photovoltaic module 100 further includes a backsheet (not shown). The backsheet is disposed on one side of the first solar cell 1211 in the thickness direction. The width of the backsheet at the location corresponding to the gap between two adjacent first solar cells 1211 and / or the gap between two adjacent second solar cells 1311 is D3, where D3 satisfies the following: 2mm≤D3≤5mm. For example, the backsheet is disposed behind the first solar cell 1211. The backsheet may be disposed in the following manner: First, the width of the backsheet at the location corresponding to the gap between two adjacent first solar cells 1211 is D3, where D3 satisfies the following: 2mm≤D3≤5mm. Second, the width of the backsheet at the location corresponding to the gap between two adjacent second solar cells 1311 is D3, where D3 satisfies the following: 2mm≤D3≤5mm. Third, the width of the backsheet at the location corresponding to the gap between two adjacent first solar cells 1211 and the gap between two adjacent second solar cells 1311 is D3, where D3 satisfies the following: 2mm≤D3≤5mm. This arrangement shields the gap between two adjacent first solar cells 1211 and the gap between two adjacent second solar cells 1311 , thereby preventing light from penetrating and facilitating long-term normal use of the photovoltaic module 100 .

[0079] The following describes the embodiments of the present invention in detail. It should be noted that the embodiments described below are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention. The battery of the present invention is described through exemplary specific embodiments.

[0080] Example 1

[0081] Combine Figure 1 , the photovoltaic module 100 includes:

[0082] Two battery strings 1, each battery string 1 includes Figure 1The three battery string groups 11 are connected in series in the left-right direction. The three battery string groups 11 include a first battery string group 12 and two second battery string groups 13. The first battery string group 12 is located to the right of the two second battery string groups 13. The first battery string group 12 includes a first battery string 121. The first battery string 121 includes twenty-two first battery cells 1211 connected in series. The twenty-two first battery cells 1211 are arranged in two columns, with each column containing eleven first battery cells 1211. Each second battery string group 13 includes two second battery strings 131 connected in parallel. Each second battery string 131 includes twenty-two second battery cells 1311 connected in series in the top-bottom direction. The number of second battery cells 1311 in each second battery string 131 is twice the number of first battery cells 1211 in a single column of the first battery string 121. Each first battery cell 1211 is a half-cell cut from a full battery cell, and each second battery cell 1311 is a quarter-cell cut from a full battery cell. The total number of the second battery cells 1311 is four times the total number of the first battery cells 1211 .

[0083] The two battery strings 1 are arranged in a vertical direction. The photovoltaic module 100 also includes a first bus bar 2, which is located between the two battery strings 1. The two battery strings 1 are symmetrically arranged about the first bus bar 2. Two second battery string groups 13 of the two battery strings 1, which are opposite in the vertical direction, are connected in parallel, and the two second battery string groups 13 are respectively connected to the first bus bar 2. Two first battery string groups 12 of the two battery strings 1, which are opposite in the vertical direction, are connected in parallel, and the two first battery string groups 12 are respectively connected to the first bus bar 2.

[0084] The photovoltaic module 100 also includes a first diode 4, a second diode 5 and two second bus bars 3. The second bus bar 3 is located at one end of the battery string group 11 away from the center of the photovoltaic module 100. The two second battery string groups 13 in the left and right directions in each battery string portion 1 are connected in series through the second bus bar 3. The first diode 4 is electrically connected to the first bus bar 2, and the first diode 4 is reversely connected in parallel with the two first battery string groups 12 symmetrically arranged in the up and down directions. The second diode 5 is electrically connected to the first bus bar 2, and the second diode 5 is reversely connected in parallel with the four second battery string groups 13.

[0085] Example 2

[0086] Combine Figure 2 The main difference from Example 1 is that the photovoltaic assembly 100 further includes two third bus bars 6 and two third diodes 7 , and the photovoltaic assembly 100 is not provided with the second diode 5 .

[0087] Two third bus bars 6 are respectively provided in the two battery string sections 1. Each third bus bar 6 is located between two adjacent second battery string groups 13 arranged in the left-right direction in each battery string section 1. One end of the third bus bar 6 is connected to the second bus bar 3, and the other end of the third bus bar 6 is connected to the first bus bar 2 between the two second battery string groups 13 arranged in the left-right direction. Two third diodes 7 are respectively electrically connected to the first bus bar 2. The third diode 7 on the left is connected in anti-parallel to the two second battery string groups 13 arranged symmetrically in the vertical direction on the left, and the third diode 7 on the left is connected in anti-parallel to the left second battery string group 13 and the third bus bar 6 arranged in the left-right direction. The third diode 7 on the right is connected in anti-parallel to the two second battery string groups 13 arranged symmetrically in the vertical direction on the right, and the third diode 7 on the right is connected in anti-parallel to the left second battery string group 13 and the third bus bar 6 arranged in the left-right direction.

[0088] Compared to conventional assemblies, the photovoltaic assembly 100 in Example 1 eliminates at least four jumper wires, and the photovoltaic assembly 100 in Example 2 eliminates at least two jumper wires. This reduces power loss caused by current passing through the jumper wires, reduces power loss in the cell string 1, and increases the power output of the photovoltaic assembly 100. Furthermore, the production and installation of jumper wires are reduced, thereby improving the production efficiency of the photovoltaic assembly 100.

[0089] Other structures and operations of the photovoltaic assembly 100 according to the embodiment 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 the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0091] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0092] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, characterized in that: include: At least one battery string portion, the battery string portion comprising a plurality of battery string groups connected in series, the plurality of battery string groups comprising a first battery string group and at least one second battery string group, the first battery string group comprising a first battery string, the first battery string comprising a plurality of first battery cells connected in series, the plurality of first battery cells being arranged in two columns, the second battery string group comprising two second battery strings connected in parallel, each second battery string comprising a plurality of second battery cells connected in series, the number of second battery cells in each second battery string being twice the number of first battery cells in a single column in the first battery string, the first battery cell being a one-Nth battery cell cut from a complete battery cell, and the second battery cell being a one-2Nth battery cell cut from the complete battery cell, wherein N is a natural number greater than or equal to 2.

2. The photovoltaic module according to claim 1, characterized in that The first battery cell is a half battery cell cut from a full battery cell, and the second battery cell is a quarter battery cell cut from the full battery cell.

3. The photovoltaic module according to claim 1, characterized in that The plurality of battery strings are arranged along a first direction, There are two battery strings, and the two battery strings are arranged along the second direction. The two second battery string groups of the two battery strings that are opposite to each other along the second direction are connected in parallel. The two first battery string groups of the two battery strings that are opposite to each other along the second direction are connected in parallel. The first direction and the second direction are perpendicular to each other.

4. The photovoltaic module according to claim 3, characterized in that Also includes: A first bus bar is located at one end of the battery string group close to the center of the photovoltaic module, the two battery strings are symmetrically arranged about the first bus bar, and the first battery string group and the second battery string group of the two battery strings are respectively connected to the first bus bar.

5. The photovoltaic module according to claim 4, characterized in that: Also includes: A first diode is electrically connected to the first bus bar, and the first diode is connected in reverse parallel to the two first battery strings symmetrically arranged along the second direction.

6. The photovoltaic module according to claim 5, characterized in that: There are two second battery string groups, and the plurality of second battery cells of the second battery string are arranged along the second direction. The first battery string group is located on one side of the two second battery string groups along the first direction.

7. The photovoltaic module according to claim 6, characterized in that: Also includes: A second diode is electrically connected to the first bus bar and is connected in reverse parallel to the two second battery strings.

8. The photovoltaic module according to claim 6, characterized in that: Also includes: A second bus bar is located at one end of the battery string group away from the center of the photovoltaic module, and two second battery string groups are connected in series through the second bus bar.

9. The photovoltaic module according to claim 8, characterized in that: Also includes: a third bus bar, two ends of the third bus bar being electrically connected to the second bus bar and the first bus bar located between the two second battery string groups; Two third diodes are electrically connected to the first bus bar, and any one of the two third diodes is connected in reverse parallel to two second battery strings symmetrically arranged along the second direction.

10. The photovoltaic module according to claim 9, characterized in that: The width of the third bus bar is W0, wherein W0 satisfies: 3mm≤W0≤8mm.

11. The photovoltaic module according to claim 1, characterized in that: The number of the first battery cells in each column is N1, wherein N1 satisfies: 8≤N1≤12; and / or, The number of the second battery cells in each of the second battery strings is N2, where N2 satisfies: 16≤N2≤24.

12. The photovoltaic module according to any one of claims 1 to 11, characterized in that: The total number of the second battery cells is four times the total number of the first battery cells.

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