Photovoltaic module

Abstract

The invention discloses a photovoltaic module, which comprises at least one battery string part, the battery string part comprises a plurality of battery string groups connected in series, the plurality of battery string groups comprise a first battery string group and at least one second battery string group, the first battery string group comprises a first battery string, and the second battery string group comprises a second battery string. The first battery string group comprises a plurality of first battery pieces which are connected in series, the plurality of first battery pieces are arranged in two columns, the second battery string group comprises two second battery strings which are connected in parallel, each second battery string comprises a plurality of second battery pieces which are connected in series, and the second battery pieces are arranged in two columns. And the number of the second battery pieces in each second battery string is twice that of the first battery pieces in the first battery string. According to the photovoltaic module provided by the invention, the power loss of the photovoltaic module is reduced, the power of the photovoltaic module is improved, the processing difficulty of the photovoltaic module is also reduced, and the production efficiency of the photovoltaic module is improved.

Description

Technical Field

[0001] The 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 the related technology, multiple cutting (such as cutting two and combining two circuit design) is an effective solution to increase the power of photovoltaic modules. When connecting cells of different layouts and designs in a photovoltaic module, it is usually necessary to use jumpers to pass current when some cells are blocked. However, the existence of jumpers will cause a large power loss in the photovoltaic module and the processing technology is also more difficult. 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 purpose of the present invention is to provide a photovoltaic module that reduces the power loss of the photovoltaic module, improves the power of the photovoltaic module, reduces the processing difficulty of the photovoltaic module, and improves the production efficiency of the photovoltaic module.

[0005] A photovoltaic module according to an embodiment of the present invention comprises: at least one battery string section, the battery string section comprises a plurality of battery string groups connected in series, the plurality of battery string groups comprise a first battery string group and at least one second battery string group, the first battery string group comprises a first battery string, the first battery string comprises 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 comprises two second battery strings connected in parallel, each of the second battery strings comprises a plurality of second battery cells connected in series, and the number of the second battery cells in each of the second battery strings is twice the number of the first battery cells in a single column in each of the first battery strings.

[0006] The photovoltaic module according to the present invention eliminates other conductive parts (such as jumpers), thereby reducing the power loss of the battery string, increasing the power of the photovoltaic module, increasing the power generation capacity of the photovoltaic module, and improving the performance of the photovoltaic module. In addition, the process difficulty in the production process of the battery string is reduced, and the production efficiency of the photovoltaic module is improved.

[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 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.

[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 opposite to each other along the second direction of the two battery string sections are connected in parallel, the two first battery string groups opposite to each other along the second direction of the two battery string sections 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 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.

[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 reverse-parallel connected to 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, a 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 is electrically connected to the first bus bar, and the second diode is connected in reverse parallel to the two second battery string groups.

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

[0015] According to some embodiments of the present invention, the photovoltaic module also includes: a third bus bar, both ends of which are electrically connected to the second bus bar and the first bus bar located between two second battery string groups, respectively; 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 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 of the second battery strings 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 given in part in the following description and in part will be obvious from the following description, or will be learned through 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 easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 is a schematic diagram of a circuit design of a photovoltaic module according to an embodiment of the present invention; Figure 2 is a schematic diagram of a circuit design of a photovoltaic module according to another embodiment of the present invention; Figure 3 is a schematic diagram of a photovoltaic module according to another embodiment of the present invention.

[0021] Reference numerals: 100. Photovoltaic modules; 1. Battery string; 11. Battery string group; 12. first battery string group; 121. first battery string; 1211. first battery cell; 13. second battery string group; 131. second battery string; 1311. second battery cell; 2. First bus bar; 3. Second bus bar; 4. The first diode; 5. The second diode; 6. The third bus bar; 7. The third diode; 8. The fourth diode. DETAILED DESCRIPTION

[0022] 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.

[0023] like Figure 1 and Figure 3As shown, a photovoltaic assembly 100 according to an embodiment of the present invention includes at least one battery string portion 1 .

[0024] Specifically, the battery string section 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, and 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.

[0025] For example, in Figure 1 and Figure 3 In the example of , 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 first battery cells 1211 in the first battery string group 12 are arranged in two rows along the left-right direction, and the two second battery strings 131 in parallel in the second battery string group 13 are also arranged along the left-right direction. Figure 1 In the example, 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.

[0026] In conventional technology, a photovoltaic module includes a plurality of battery strings connected in series, each battery string includes two battery columns connected in parallel, each battery column includes a plurality of battery cells connected in series, and a jumper is provided between two adjacent battery strings. In such a configuration, a first battery string group 12 includes a first battery string 121, and a plurality of first battery cells 1211 in the first battery string 121 are connected in series and arranged in two columns, so that current can flow directly between the first battery string 121 and the second battery string 131, and a jumper does not need to be provided between the first battery string group 12 and the second battery string group 13, thereby eliminating a jumper, thereby improving the power loss caused by the current passing through other conductive parts (such as a jumper), reducing the power loss of the battery string part 1, increasing the power of the photovoltaic module 100, increasing the power generation capacity of the photovoltaic module 100, and improving the performance of the photovoltaic module 100. Moreover, the process of processing other conductive parts is also reduced, thereby reducing the process of connecting other conductive parts with multiple battery string groups 11, reducing the process difficulty in the production process of the battery string part 1, and thereby improving the production efficiency of the photovoltaic module 100.

[0027] In addition, by setting the number of second battery cells 1311 in each second battery string 131 to be twice the number of single-column first battery cells 1211 in the first battery string 121, it is also 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 part 1 remain consistent, and 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.

[0028] The photovoltaic module 100 according to the present invention eliminates other conductive parts (such as jumpers), thereby reducing the power loss of the battery string 1, increasing the power of the photovoltaic module 100, increasing the power generation capacity of the photovoltaic module 100, and improving the performance of the photovoltaic module 100. In addition, the process difficulty in the production process of the battery string 1 is reduced, and the production efficiency of the photovoltaic module 100 is improved.

[0029] According to some embodiments of the present invention, referring to Figure 3 The first battery cell 1211 is a one-Nth battery cell cut from a complete battery cell, and the second battery cell 1311 is a one-2Nth battery cell cut from a complete battery cell, where N is a natural number greater than or equal to 2.

[0030] For example, in Figure 3 In the example, the first battery cell 1211 and the second battery cell 1311 are cut from complete battery cells of the same size into small battery cells of different sizes. For example, when the lengths of the first battery cell 1211 and the second battery cell 1311 (e.g., the lengths along the left and right directions) are the same, the width of the second battery cell 1311 (i.e., the lengths along the left and right directions of the second battery cell 1311) is Figure 1 The width in the up-down direction in the figure) is the width of the first battery cell 1211 (i.e. the width of the first battery cell 1211 along Figure 1Such a configuration effectively ensures that the length of a single-row of multiple first battery sheets 1211 (i.e., the total length of a single-row of multiple first battery sheets 1211 in the vertical direction) is the same as the length of a single-string second battery string 131 composed of multiple second battery sheets 1311 (i.e., the length of the second battery string 131 in the vertical direction), thereby further ensuring that the length of the battery string portion 1 composed of the first battery string group 12 and the second battery string group 13 is uniform, and also makes the effective utilization area of ​​a single-row of multiple first battery sheets 1211 the same as the effective utilization area of ​​the second battery string 131, so that the first battery string group 12 and the second battery string group 13 are compatible, which is conducive to the performance improvement and normal use of the photovoltaic module 100. In addition, the current and voltage of the first battery string group 12 are also kept consistent with the current and voltage of the second battery string group 13, so that when the first battery string group 12 and the second battery string group 13 are connected, other conductive parts (such as jumpers) can be omitted, and the power loss of the photovoltaic module 100 is greatly reduced. In addition, cutting the complete battery cell will reduce the current, reduce the thermal loss of the battery string 1, and also have the effect of increasing the power of the photovoltaic module 100.

[0031] According to some embodiments of the present invention, referring to Figure 3 The first battery cell 1211 is a half battery cell cut from a complete battery cell, and the second battery cell 1311 is a quarter battery cell cut from a complete battery cell.

[0032] For example, the first battery cell 1211 is a two-piece battery obtained by cutting a complete battery cell, and the second battery cell 1311 is a four-piece battery obtained by cutting a complete battery cell. The current of the first battery cell 1211 is twice the current of the second battery cell 1311, and the area of ​​the first battery cell 1211 is twice the area of ​​the second battery cell 1311. In this way, the complete battery cell is easy to cut into the first battery cell 1211, which reduces the difficulty of forming the first battery cell 1211, thereby improving the production efficiency of the first battery cell 1211, that is, improving the production efficiency of the first battery cell 1211, that is, improving the production efficiency of the first battery cell string group 12. Moreover, under the limited length of the first battery string group 12, the distance between two adjacent first battery cells 1211 is large, which is easy to arrange the first battery cell 1211 and easy to produce the first battery string group 12. In addition, the second battery cell 1311 is one-fourth of the complete battery cell, and the width of the second battery cell 1311 is small, which effectively reduces the current of the second battery cell 1311, thereby reducing the thermal loss of the second battery cell 1311, and thus improving the power.

[0033] According to some embodiments of the present invention, referring to Figure 1 and Figure 3 , multiple battery strings 11 are arranged along a first direction (such as Figure 1There are two battery strings 1, and the two battery strings 1 are arranged along the second direction (as shown in the left and right direction). 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.

[0034] 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 parts 1 are arranged in the up-down direction. The two second battery string groups 13 opposite to each other in the up-down direction in the two battery string parts 1 are connected in parallel, and the two first battery string groups 12 opposite to each other in the up-down direction in the two battery string parts 1 are connected in parallel. In this way, the photovoltaic module 100 includes two battery string parts 1, which increases the illumination 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. Among them, when the battery cells in a single battery string part 1 are blocked, resulting in an abnormal current flow path where the blocked battery cells are located, the other battery string part 1 can still be used normally, so that the current collection and conversion capacity of the photovoltaic module 100 can be maintained at a high level, and the current loss of the photovoltaic module 100 is greatly reduced. However, it is not limited to this. It should be noted that the number and arrangement of the battery string parts 1 and the battery string groups 11 can be specifically set according to actual usage to meet actual needs.

[0035] 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.

[0036] For example, in Figure 1 and Figure 3In the example, two battery string parts 1 are located on the upper and lower sides of the first bus bar 2, and the two battery string parts 1 are symmetrically arranged about the first bus bar 2 in the upper and lower directions, and the multiple battery string groups 11 of the two battery string parts 1 are respectively connected to the first bus bar. That is to say, the photovoltaic module 100 includes two battery string parts 1, one of which is located on the upper side of the first bus bar 2, and the other battery string part 1 is located on the lower side of the first bus bar 2, and the two battery string parts 1 share the first bus bar 2. The two first battery string groups 12 opposite to each other in the upper and lower directions are connected in parallel through the first bus bar 2, and the two second battery string groups 13 opposite to each other in the upper and lower directions are connected in parallel through the first bus bar 2. The adjacent first battery string groups 12 and the second battery string groups 13 located on the same side of the first bus bar 2 are connected in series through the first bus bar 2. In this way, the two battery string parts 1 share the first bus bar 2, which is convenient for the parallel connection of the two opposite first battery string groups 12 and the parallel connection of the two opposite second battery string groups 13, which is convenient for connection and improves the installation effect. Furthermore, the utilization rate of the first bus bar 2 is also improved.

[0037] 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 is electrically connected to the first bus bar 2, and the first diode 4 is reversely connected in parallel along the second direction (eg Figure 1 Two first battery string groups 12 are symmetrically arranged in the up and down direction (as shown).

[0038] For example, in Figure 1 In the example, the first diode 4 is reversely connected in parallel to the two first battery string groups 12 symmetrically arranged in the vertical direction in the two battery string parts 1. In this way, the first diode 4 is used to protect the first battery string 121, and the current sequentially passes through the plurality of first battery cells 1211 in the first battery string 121, thereby preventing the current from flowing directly out along the first bus bar 2 when flowing through the first battery string group 12, so that the first battery string group 12 can be used normally for a long time. In addition, the first diode 4 protects the first battery string group 12 in the two battery string parts 1 at the same time, that is, the first diode 4 can protect the two first battery strings 121 opposite to each other in the up-down direction. When one of the first battery cells 1211 in the first battery string 121 on the upper side of the first bus bar 2 is damaged, the current can flow to the second battery string 131 through the first diode 4, and the first battery string 121 located on the lower side of the first bus bar 2 can be used normally, so as to ensure the normal collection and convergence of the current, so as to ensure that the second battery string 131 and the first battery string 121 on the lower side of the first bus bar 2 can be used normally, thereby extending the service life of the photovoltaic module 100 and improving the performance and photoelectric conversion of the photovoltaic module 100. Among them, the photovoltaic module 100 also includes a first junction box (not shown in the figure), which is arranged on the back of the photovoltaic module 100, the first junction box is opposite to the first bus bar 2, and the first diode 4 is arranged in the first junction box.

[0039] According to some embodiments of the present invention, referring to Figure 1 There are two second battery string groups 13, and a 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. 1 ), the first battery string group 12 is located on one side of the two second battery string groups 13 along the first direction.

[0040] 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 is convenient for the two second battery string groups 13 to be connected in series and then connected in series with the first battery string group 12, thereby avoiding connection errors when multiple battery string groups 11 are connected, 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 arrangement of the first battery string group 12 and the second battery string group 13 is reasonable, which improves the surface utilization rate of the photovoltaic module 100 and the power generation of the photovoltaic module 100.

[0041] 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 the second diode 5 is reversely connected in parallel to at least two second battery strings 13. Figure 1 In the example of , the second diode 5 is reversely connected in parallel between two adjacent second battery strings 13. The current flows from the positive electrode to the negative electrode in the photovoltaic module 100. The current flow direction is described below by taking the battery string 1 on the upper side of the first bus bar 2 as an example, wherein when the photovoltaic module 100 is in normal use, the current flow paths of the two battery strings 1 are symmetrical about the first bus bar 2.

[0042] 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.

[0043] In the photovoltaic module 100, a second cell 1311 in the cell string 1 on the upper side of the first bus bar 2 is damaged (eg 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 the second battery cell 1311 is damaged, the current flow path is as follows: after starting from the positive electrode, the current flows directly to the right second battery string 131 in the left second battery string group 13 along the first bus bar 2, flows upward, then flows into the right second battery string group 13, flows downward, and then flows along the first bus bar 2 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 to the negative electrode along the first bus bar 2. The current in the battery string part 1 on the lower side of the first bus bar 2 flows normally, that is, the battery string part 1 on the lower side of the first bus bar 2 is used normally.

[0044] In the photovoltaic assembly 100, one second battery cell 1311 in each of the two second battery strings 131 in the battery string portion 1 on the upper side of the first bus bar 2 is damaged (eg Figure 1 When the two second battery cells 1311 indicated by the dashed 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: after starting from the positive electrode, the current flows along the first bus bar 2 through the second diode 5, and then flows to the second battery string 131 on the left side of the second battery string group 13 on the right, the second battery string 131 on the right side of the second battery string group 13 on the right, and then flows along the first bus bar 2 to the first battery string 121 on the left side of the multiple first battery cells 1211 and the first battery string 121 on the right side of the multiple first battery cells 1211, and then flows to the negative electrode along the first bus bar 2. The current in the battery string part 1 on the lower side of the first bus bar 2 flows normally, that is, the battery string part 1 on the lower side of the first bus bar 2 is used normally.

[0045] In this way, the second diode 5 protects the two second battery strings 13. When the second battery cell 1311 in one of the second battery strings 13 is damaged, the other second battery string 13 can still be used normally for use. In addition, the second diode 5 also protects the two second battery strings 13 in the battery string part 1 on the lower side of the first bus bar 2. In addition, the two second battery strings 13 in the left and right directions are protected by a second diode 5, which reduces the material usage of the second diode 5, reduces the installation difficulty of the photovoltaic module 100, and improves production efficiency. Among them, the photovoltaic module 100 also includes a second junction box (not shown in the figure), which is arranged on the back of the photovoltaic module 100. The positive projection of the second junction box can be between the two second battery strings 13 arranged in the left and right directions, and the second junction box is opposite to the first bus bar 2. The second diode 5 is arranged in the second junction box.

[0046] 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 .

[0047] For example, in Figure 1 and Figure 3 In the example, both ends of the second bus bar 3 are respectively connected to one end of the second battery string group 13 away from the first bus bar 2. Two second bus bars 3 are provided, which are 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 taken as an example for explanation. 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 along the left and right directions are respectively connected to the two battery string groups 11.

[0048] 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.

[0049] 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 .

[0050] Specifically, the two 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 any one of the two third diodes 7 is reversely connected in parallel along the second direction (such as Figure 2 Two second battery string groups 13 are symmetrically arranged in the up and down direction (as shown).

[0051] For example, in Figure 2In the example, 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 up-down direction on the left side, and one of the third diodes 7 is connected in reverse parallel between the third bus bar 6 arranged in the left-right direction and the second battery string group 13 on the left side. 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 up-down direction on the right side, and the other third diode 7 is connected in reverse parallel between the third bus bar 6 arranged in the left-right direction and the second battery string group 13 on the right side.

[0052] 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, 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 the third junction box 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, and the second diode 5 is arranged 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 third diode 7 on the left of the two third diodes 7 is used to protect the two second battery strings 13 on the left, which are located on the upper and lower sides of the first bus bar 2, respectively, and the third diode 7 on the right of the two third diodes 7 is used to protect the Figure 2 The two second battery strings 13 at the middle position shown are located on the upper and lower sides of the first bus bar 2, and the two third diodes 7 are arranged in the same third junction box. In addition, the two third diodes 7 only require one third junction box while ensuring the protection effect of the corresponding second battery string 13, which reduces the use of the third junction box, is more conducive to the arrangement of components on the photovoltaic module 100, and also simplifies the circuit arrangement of the photovoltaic module 100.

[0053] The following takes the battery string 1 on the upper part of the photovoltaic module 100 as an example to describe the flow direction of current during use, wherein when the photovoltaic module 100 is in normal use, the flow paths of the two battery strings 1 are symmetrical about the first bus bar 2. When the first battery cell 1211 or the second battery cell 1311 in one of the two battery strings 1 is damaged, the other battery string 1 is used normally. The photovoltaic module 100 is provided with a third bus bar 6 and two third diodes 7, and the photovoltaic module 100 is described by an exemplary specific embodiment.

[0054] The photovoltaic module 100 is provided with a third bus bar 6 and two third diodes 7, referring to Figure 2The current flow path when the photovoltaic module 100 is in normal use is as follows: after the current starts from the positive electrode, it flows along the first bus bar 2 to the second battery string group 13 on the left, flows upward, and 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 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.

[0055] In the photovoltaic module 100, a second cell 1311 is damaged (eg Figure 2 When the second battery cell 1311 indicated by the dashed box indicated by the arrow C is damaged, refer to Figure 2 , the current flow path when the above-mentioned second battery cell 1311 is damaged is as follows: after starting from the positive electrode, the current flows along the first bus bar 2 through one of the above-mentioned 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 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.

[0056] In this way, the two third diodes 7 protect the two second battery strings 13. When the second battery cell 1311 in one of the second battery strings 13 is damaged, the other second battery string 13 can still be used normally along the third bus bar 6, thereby extending the service life of the battery string 1. In addition, the third diode 7 also protects the two second battery strings 13 in the battery string 1 of the lower part of the photovoltaic module 100, thereby improving the performance of the photovoltaic module 100. Among them, when the number of the first battery cell 1211 and the second battery cell 1311 is small, or the risk of hot spots in the battery string 1 is low, the third bus bar 6 can be removed, and only one third diode 7 is required between the two second battery strings 13. It should be noted that the two battery strings 1 respectively include two second battery strings 13 and a first battery string 12 connected in series through the second bus bar 3, the first battery string 12 includes a first battery string 121 formed by a plurality of first battery cells 1211 connected in series, and the second battery string 13 includes two second battery 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 along the vertical direction, that is, the current flow paths of the two battery strings 1 are symmetrical along the vertical direction.

[0057] According to some embodiments of the present invention, referring to Figure 1 , the width of the third busbar 6 is W0, where W0 satisfies: 3mm≤W0≤8mm. Figure 1In the example in , the width of the third bus bar 6 along the left-right direction is W0. When the width of the third bus bar 6 is less than 3mm, the resistance of the third bus bar 6 is large, which reduces the conductivity of the third bus bar 6, thereby affecting the use. When the width of the third bus bar 6 is greater than 8mm, the width of the third bus bar 6 is large, which increases the occupied area of ​​the third bus bar 6, increases the difficulty of arranging the plurality of second battery cells 1311 and the plurality of first battery cells 1211 along the left-right direction, and reduces the production efficiency. Therefore, by setting the width W0 of the third bus bar 6 to meet: 3mm≤W0≤8mm, the third bus bar 6 is reasonably set, the resistance of the third bus bar 6 is reduced, and the conductivity of the third bus bar 6 is improved, which is convenient for use. In addition, the difficulty of arranging the plurality of second battery cells 1311 and the plurality of first battery cells 1211 along the left-right direction is also reduced, and the production efficiency is improved. Among them, there is a third bus bar 6 in both battery string parts 1.

[0058] According to some embodiments of the present invention, the number of the first battery cells 1211 in each column is N1, wherein N1 satisfies: 8≤N1≤12; and / or, the number of the second battery cells 1311 in each second battery string 131 is N2, wherein N2 satisfies: 16≤N2≤24. For example, the configuration of the first battery cells 1211 in each column and each second battery string 131 includes the following cases: First, the number of the first battery cells 1211 in each column is N1, wherein N1 satisfies: 8≤N1≤12. Second, the number of the second battery cells 1311 in each second battery string 131 is N2, wherein N2 satisfies: 16≤N2≤24. Third, the number of the 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, wherein N1 and N2 respectively satisfy: 8≤N1≤12, 16≤N2≤24.

[0059] With such a configuration, the number of the multiple first battery cells 1211 in each column and the number of the second battery cells 1311 in each second battery string 131 are rationally configured, thereby rationalizing the length of the photovoltaic module 100 along the up and down directions, which not only improves 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.

[0060] 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 section 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, so that the circuit parameters of the two second battery string groups 13 in the battery string section 1 match the circuit parameters of the first battery string group 12, which is convenient for subsequent use.

[0061] According to some embodiments of the present invention, referring to Figure 3 , the width of the first battery cell 1211 is W1, the length of the first battery cell 1211 is L1, wherein W1 and L1 respectively satisfy: 90mm≤W1≤105.5mm, 182mm≤L1≤211mm; and / or, the width of the second battery cell 1311 is W2, the length of the second battery cell 1311 is L2, wherein W2 and L2 respectively satisfy: 45.5mm≤W2≤52.75mm, 182mm≤L2≤211mm. For example, the arrangement 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, the length of the first battery cell 1211 is L1, wherein W1 and L1 respectively satisfy: 90mm≤W1≤105.5mm, 182mm≤L1≤211mm. Second, the width of the second battery cell 1311 is W2, and the length of the second battery cell 1311 is L2, wherein 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, wherein W1, L1, W2, and L2 respectively satisfy: 90mm≤W1≤105.5mm, 182mm≤L1≤211mm, 45.5mm≤W2≤52.75mm, and 182mm≤L2≤211mm.

[0062] With such arrangement, the size of the first cell 1211 and the size of the second cell 1311 are reasonably arranged 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.

[0063] 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: -0.5mm≤D1≤1.0mm.

[0064] For example, in Figure 3In the example, the spacing between two adjacent first battery cells 1211 arranged in the left-right direction is D1, and the spacing between two adjacent first battery cells 1211 arranged in the up-down 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, which reduces 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 two adjacent first battery cells 1211 is large, which increases 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 sheets 1211 in the first battery string 121 to satisfy: -0.5mm≤D1≤1.0mm, the spacing between two adjacent first battery sheets 1211 is reasonably set, the overlapping area between the two adjacent first battery sheets 1211 is reduced, thereby reducing the shielding area and improving the power generation of the first battery string group 12. In addition, reducing the spacing between two adjacent first battery sheets 1211 reduces the difficulty of arranging multiple second battery sheets 1311 and multiple first battery sheets 1211, thereby improving the production efficiency of the battery string part 1.

[0065] 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: -0.5mm≤D2≤1.0mm.

[0066] For example, in Figure 3In the example, the spacing between two adjacent second battery sheets 1311 arranged in the left-right direction is D2, and the spacing between two adjacent second battery sheets 1311 arranged in the up-down direction is also D2. When the spacing between two adjacent second battery sheets 1311 in the second battery string 131 is less than -0.5 mm, the overlapping area between the two adjacent second battery sheets 1311 is large, which reduces the power generation of the second battery string group 13. When the spacing between two adjacent second battery sheets 1311 in the second battery string 131 is greater than 1.0 mm, the spacing between two adjacent second battery sheets 1311 is large, which increases the difficulty of arranging multiple second battery sheets 1311 and multiple first battery sheets 1211. Therefore, by setting the spacing D2 between two adjacent second battery sheets 1311 in the second battery string 131 to satisfy: -0.5mm≤D2≤1.0mm, the spacing between two adjacent second battery sheets 1311 is reasonably set, the overlapping area between two adjacent second battery sheets 1311 is reduced, thereby reducing the shielding area and improving the power generation of the second battery string group 13. In addition, reducing the spacing between two adjacent second battery sheets 1311 reduces the difficulty of arranging multiple second battery sheets 1311 and multiple first battery sheets 1211, thereby improving the production efficiency of the battery string part 1.

[0067] According to some 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, wherein 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 is reasonably set, and the spacing between two adjacent second battery cells 1311 is reasonably set, which reduces the overlapping area between two adjacent first battery cells 1211 in the first battery string 121, and reduces the overlapping area between two adjacent second battery cells 1311 in the second battery string 131, thereby reducing the shielding area and improving 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 multiple second battery cells 1311 and multiple first battery cells 1211, thereby improving the production efficiency of the battery string part 1.

[0068] According to some embodiments of the present invention, the photovoltaic module 100 further includes a back plate (not shown in the figure), which is arranged on one side of the thickness direction of the first battery cell 1211, and the width of the back plate relative to the gap between two adjacent first battery cells 1211 and / or the gap between two adjacent second battery cells 1311 is D3, wherein D3 satisfies: 2mm≤D3≤5mm. For example, the back plate is arranged at the rear side of the first battery cell 1211. The arrangement of the back plate includes the following situations: First, the width of the back plate relative to the gap between two adjacent first battery cells 1211 is D3, wherein D3 satisfies: 2mm≤D3≤5mm. Second, the width of the back plate relative to the gap between two adjacent second battery cells 1311 is D3, wherein D3 satisfies: 2mm≤D3≤5mm. Third, the width of the back plate relative to the gap between two adjacent first battery cells 1211 and the gap between two adjacent second battery cells 1311 is D3, wherein D3 satisfies: 2mm≤D3≤5mm. With such an arrangement, the gap between two adjacent first battery cells 1211 and the gap between two adjacent second battery cells 1311 are shielded, thereby preventing light from being transmitted, so that the photovoltaic module 100 can be used normally for a long time.

[0069] The embodiments of the present invention are described in detail below. 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 by means of exemplary specific embodiments.

[0070] Example 1 Combination Figure 1 , the photovoltaic module 100 comprises: Two battery strings 1, each battery string 1 includes Figure 1 The three battery string groups 11 are connected in series in the left-right direction, and 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 on the right side of the two second battery string groups 13. The first battery string group 12 includes a first battery string 121, and 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, and each column includes eleven first battery cells 1211. Each second battery string group 13 includes two second battery strings 131 connected in parallel, and each second battery string 131 includes twenty-two second battery cells 1311 connected in series in the up-down 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 in the first battery string 121. Each first battery cell 1211 is a half battery cell cut from a complete battery cell, and each second battery cell 1311 is a quarter battery cell cut from a complete battery cell. The total number of the second battery cells 1311 is four times the total number of the first battery cells 1211 .

[0071] The two battery strings 1 are arranged in the up-down direction, and the photovoltaic module 100 further includes a first bus bar 2, which is located between the two battery strings 1, and the two battery strings 1 are symmetrically arranged about the first bus bar 2. The two second battery string groups 13 of the two battery strings 1 that are opposite to each other in the up-down direction are connected in parallel, and the two opposite second battery string groups 13 are respectively connected to the first bus bar 2, and the two first battery string groups 12 of the two battery strings 1 that are opposite to each other in the up-down direction are connected in parallel, and the two opposite first battery string groups 12 are respectively connected to the first bus bar 2.

[0072] 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 along 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.

[0073] Example 2 Combination Figure 2 The main difference from Example 1 is that the photovoltaic component 100 further includes two third bus bars 6 and two third diodes 7 , and the photovoltaic component 100 is not provided with the second diode 5 .

[0074] Two third bus bars 6 are respectively arranged in two battery string parts 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 part 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 reversely connected in parallel with the two second battery string groups 13 symmetrically arranged in the up-down direction on the left, and the third diode 7 on the left is reversely connected in parallel with 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 reversely connected in parallel with the two second battery string groups 13 symmetrically arranged in the up-down direction on the right, and the third diode 7 on the right is reversely connected in parallel with the left second battery string group 13 and the third bus bar 6 arranged in the left-right direction.

[0075] Compared with the traditional assembly, the photovoltaic assembly 100 in Example 1 saves at least four jumpers, and the photovoltaic assembly 100 in Example 2 can save at least two jumpers, thereby improving the power loss caused by the current passing through the jumpers, reducing the power loss of the battery string 1, and improving the power of the photovoltaic assembly 100. In addition, the production and installation of jumpers are reduced, and the production efficiency of the photovoltaic assembly 100 is improved.

[0076] 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.

[0077] 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 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, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0078] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0079] Although the 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 present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A photovoltaic module, characterized in that: include: At least one battery string section, the battery string section 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 the second battery cells in each of the second battery strings is twice the number of the first battery cells in a single column in the first battery string.

2. The photovoltaic module according to claim 1, characterized in that: The first battery cell is a one-Nth battery cell cut from a complete battery cell, and the second battery cell is a one-2Nth battery cell cut from the complete battery cell, wherein N is a natural number greater than or equal to 2.

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

4. 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. Two second battery string groups of the two battery strings that are opposite to each other along the second direction are connected in parallel, and two first battery string groups of the two battery strings 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.

5. The photovoltaic module according to claim 4, characterized in that: Also includes: A first bus bar, wherein the 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.

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

7. The photovoltaic module according to claim 6, 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.

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

9. The photovoltaic module according to claim 7, characterized in that: Also includes: A second bus bar, wherein the second bus bar is located at one end of the battery string group away from the center of the photovoltaic module, and two of the second battery string groups are connected in series through the second bus bar.

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

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

12. 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, wherein N2 satisfies: 16≤N2≤24.

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

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