Photovoltaic module and photovoltaic system

Abstract

The present disclosure relates to a photovoltaic module and a photovoltaic system, the photovoltaic module comprising cell units, the cell units comprising two groups of cell strings arranged side by side along a first direction, each group of cell strings comprising a first cell string and a second cell string arranged along a second direction, the welding ribbons on the front surfaces of the adjacent two cell pieces of the two adjacent first cell strings in the first direction being connected in parallel through a first busbar, the welding ribbons on the back surfaces of the adjacent two cell pieces of the two adjacent second cell strings in the first direction being connected in parallel through a second busbar, the welding ribbons on the back surfaces of the cell pieces at one end of the first cell string away from the first busbar being connected in series with the welding ribbons on the front surfaces of the cell pieces at one end of the second cell string away from the second busbar through a third busbar; the overlapping area of the third busbar with the first cell string is greater than the overlapping area of the third busbar with the second cell string, so as to ensure that the module power of the photovoltaic module remains unchanged, reduce the module area, and improve the working efficiency of the photovoltaic module.

Description

Technical Field

[0001] This disclosure relates to the field of photovoltaic technology, and more specifically, to a photovoltaic module and a photovoltaic system. Background Technology

[0002] In related technologies, adjacent cell strings of photovoltaic modules are connected by busbars. However, the arrangement of the busbars causes them to occupy the planar space of the module, increasing the module area and hindering the improvement of the module's working efficiency. Utility Model Content

[0003] The purpose of this disclosure is to provide a photovoltaic module and a photovoltaic system that can reduce the module area of ​​the photovoltaic module while keeping the module power unchanged, thereby helping to improve the working efficiency of the photovoltaic module.

[0004] To achieve the above objectives, a first aspect of this disclosure provides a photovoltaic module, comprising: a battery cell including two sets of battery strings arranged side-by-side along a first direction, each set of battery strings including a first battery string and a second battery string arranged along a second direction, each of the first and second battery strings including a plurality of battery cells arranged side-by-side and connected in series along the first direction, each battery cell having a front side facing a first side of the photovoltaic module and a back side facing a second side of the photovoltaic module; solder strips on the front sides of adjacent two battery cells of two adjacent first battery strings in the first direction are connected in parallel by a first busbar, solder strips on the back sides of adjacent two battery cells of two adjacent second battery strings in the first direction are connected in parallel by a second busbar, and solder strips on the back sides of battery cells at the end of the first battery string away from the first busbar and solder strips on the front sides of battery cells at the end of the second battery string in the same set away from the second busbar are connected in series by a third busbar; wherein the overlap area between the third busbar and the first battery string is greater than the overlap area between the third busbar and the second battery string.

[0005] Optionally, the second battery string is offset relative to the first battery string on the side facing the second busbar, so as to reserve a first gap at the end of the second battery string away from the second busbar to avoid at least part of the third busbar.

[0006] Optionally, the third busbar includes a first connecting segment connected to the first battery string and a second connecting segment connected to the second battery string. The orthographic projection of the first connecting segment on the photovoltaic module is at least partially located inside the back of the battery cell at one end of the first battery string opposite to the first busbar, and the orthographic projection of the second connecting segment on the photovoltaic module is at least partially located inside the first gap.

[0007] Optionally, the orthographic projection of the first connecting segment on the photovoltaic module is located inside the back surface of the cell at the end of the first battery string opposite to the first busbar, and the solder strip on the back surface of the cell at the end of the first battery string opposite to the first busbar is connected to the first connecting segment; the orthographic projection of the second connecting segment on the photovoltaic module is located inside the first gap, and the solder strip on the front surface of the cell at the end of the second battery string opposite to the second busbar extends to the outside of the cell and is connected to the second connecting segment located in the first gap.

[0008] Optionally, when the orthographic projection of the second connecting segment on the photovoltaic module is located inside the first gap, a first insulating structure is provided between the second connecting segment and the back of the cell at the end of the second battery string opposite to the second busbar.

[0009] Optionally, a second gap is provided between two adjacent cells of two adjacent first cell strings in the first direction to avoid at least part of the first busbar, such that the orthographic projection of the first busbar on the photovoltaic module is at least partially located inside the second gap.

[0010] Optionally, the orthographic projection of the first busbar on the photovoltaic module is located inside the second gap, and the solder strips on the front surfaces of two adjacent cells of two adjacent first cell strings in the first direction extend to the outside of the cell and are connected to the first busbar located in the second gap.

[0011] Optionally, when the orthographic projection of the first busbar on the photovoltaic module is located inside the second gap, a second insulating structure is provided between the first busbar and the back surfaces of two adjacent cells of two adjacent first cell strings in the first direction.

[0012] Optionally, the orthographic projection of the second busbar on the photovoltaic module is at least partially located inside the back side of two adjacent cells of two adjacent second cell strings in the first direction, and the solder strips on the back side of two adjacent cells of two adjacent second cell strings in the first direction are each connected to the second busbar.

[0013] Optionally, multiple battery cells of two first battery strings arranged side-by-side along a first direction are symmetrically arranged about the first busbar; and / or, multiple battery cells of two second battery strings arranged side-by-side along a first direction are symmetrically arranged about the second busbar.

[0014] Optionally, the width of the first busbar along the first direction is 4mm-8mm; and / or, the thickness of the first busbar is 0.3mm-0.5mm; and / or, the width of the second busbar along the first direction is 8mm-15mm; and / or, the thickness of the second busbar is 0.05mm-0.25mm; and / or, the width of the third busbar along the first direction is 4mm-8mm; and / or, the thickness of the third busbar is 0.05mm-0.25mm.

[0015] Optionally, the number of battery cells is multiple and they are arranged side by side along the second direction, and the adjacent first busbars and second busbars of two adjacent battery cells are connected so that the multiple battery cells are connected in series.

[0016] A second aspect of this disclosure provides a photovoltaic system comprising the photovoltaic modules provided in the first aspect.

[0017] Through the above-described technical solution, namely the photovoltaic module provided in this disclosure, the photovoltaic module is constructed by configuring the battery cells as including two sets of battery strings arranged side by side along a first direction. Each set of battery strings includes a first battery string and a second battery string arranged along a second direction. In the first direction, the solder strips on the front sides of adjacent cells of two adjacent first battery strings are connected in parallel through a first busbar, and the solder strips on the back sides of adjacent cells of two adjacent second battery strings are connected in parallel through a second busbar. At the same time, the solder strips on the back sides of the cells at the end of the first battery string facing away from the first busbar are connected to the solder strips on the second battery strings in the same group. The solder strips on the front side of the solar cell at the end opposite to the second busbar are connected in series through the third busbar. In this way, based on the above-mentioned arrangement of solar cells, by making the overlap area between the third busbar and the first solar cell string larger than the overlap area between the third busbar and the second solar cell string, the third busbar can at least partially overlap with the solar cell string, thereby reducing the encroachment of the third busbar on the planar space of the module. This allows for a reduction in the area of ​​the solar module while maintaining the same module power, which helps to increase the available cell area and improve the working efficiency of the solar module.

[0018] Furthermore, by constructing the overlap area between the third busbar and the first battery string to be larger than the overlap area between the third busbar and the second battery string, the third busbar can be located at least partially inside the first battery string while also being located at least partially outside the second battery string. Thus, when connecting the third busbar to the back of the battery cells of the first battery string via solder strips, and to the front of the battery cells of the second battery string via solder strips, it is not necessary to flip or bend the solder strips to the other side to achieve the connection with the third busbar. This simplifies the operation and reduces the complexity of the manufacturing process.

[0019] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0021] Figure 1 This is a schematic diagram of a photovoltaic module provided in an exemplary embodiment of this disclosure;

[0022] Figure 2 yes Figure 1 A schematic diagram showing the connection between the third busbar and the battery cells of the first battery string at position A in the middle;

[0023] Figure 3 yes Figure 1 A schematic diagram showing the connection between the third busbar and the battery cells of the second battery string at position B in the middle.

[0024] Figure 4 yes Figure 1 A schematic diagram showing the connection between the first busbar and the battery cells of the first battery string at position C in the middle;

[0025] Figure 5 yes Figure 1 A schematic diagram showing the connection of the second busbar and the battery cells of the second battery string at position D in the middle;

[0026] Figure 6 This is an exploded view of a photovoltaic module provided in an exemplary embodiment of this disclosure;

[0027] Figure 7 This is a schematic diagram of the battery cell provided in the second embodiment of this disclosure;

[0028] Figure 8 This is a schematic diagram of a photovoltaic module in related technologies.

[0029] Explanation of reference numerals in the attached figures

[0030] 1-Battery unit; 110-Battery string; 111-First battery string; 112-Second battery string; 113-Battery cell; 1131-Front side; 1132-Back side; 1133-Third gap; 120-First busbar; 130-Second busbar; 140-Third busbar; 141-First connecting section; 142-Second connecting section; 150-First gap; 160-First insulation structure; 170-Second gap; 180-Second insulation structure; 190-Welding strip; 2-End busbar; 3-Glass. Detailed Implementation

[0031] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0032] In this disclosure, unless otherwise stated, "inner" and "outer" refer to the inner and outer contours relative to the outline of the component or structure itself. Furthermore, it should be noted that terms such as "first" and "second" are used to distinguish one element from another and do not indicate sequence or importance. Additionally, in the description with reference to the accompanying drawings, the same reference numerals in different drawings denote the same elements.

[0033] The inventor discovered through research that, in the relevant technologies, reference Figure 8 As shown, adjacent cell strings of a photovoltaic module are connected by busbars. For example, taking the end busbar 2 located at the end of cell 113 as an example, since the end busbar 2 connecting two adjacent cells 113 is usually arranged on the outside of cell 113, in order to ensure the resistivity of the busbar and the requirements of the process, the width S2 of the end busbar 2 is usually unchanged. In addition, a process distance S3 needs to be reserved between the end busbar 2 and cell 113. At the same time, a process distance S1 is also reserved between the end busbar 2 and the edge of the glass 3 of the photovoltaic module. Therefore, under this arrangement of the end busbar 2, the busbar occupies the planar space of the module, increases the module area of ​​the photovoltaic module, and limits the area of ​​the cells that can be laid out, which is not conducive to improving the working efficiency of the photovoltaic module.

[0034] Based on this, according to the first aspect of this disclosure, a photovoltaic module is provided, with reference to... Figures 1 to 7As shown, the photovoltaic module includes a battery unit 1, which includes two sets of battery strings 110 arranged side by side along a first direction. Each set of battery strings 110 includes a first battery string 111 and a second battery string 112 arranged along a second direction. Each of the first battery string 111 and the second battery string 112 includes a plurality of battery cells 113 arranged side by side and connected in series along the first direction. Each battery cell 113 has a front side 1131 facing the first side of the photovoltaic module and a back side 1132 facing the second side of the photovoltaic module. The solder strips 190 on the front side 1131 of two adjacent battery cells 113 of two adjacent first battery strings 111 in the first direction pass through a first junction box. The flow bars 120 are connected in parallel. The solder strips 190 on the back side 1132 of the two adjacent battery cells 113 of the two adjacent second battery strings 112 in the first direction are connected in parallel through the second bus bar 130. The solder strips 190 on the back side 1132 of the battery cells 113 of the first battery string 111 away from the first bus bar 120 and the solder strips 190 on the front side 1131 of the battery cells 113 of the second battery string 112 away from the second bus bar 130 in the same group are connected in series through the third bus bar 140. The overlap area between the third bus bar 140 and the first battery string 111 is greater than the overlap area between the third bus bar 140 and the second battery string 112.

[0035] Through the above technical solution, namely the photovoltaic module provided in this disclosure, the photovoltaic module constructs the battery cell 1 as including two sets of battery strings 110 arranged side by side along a first direction. Each set of battery strings 110 includes a first battery string 111 and a second battery string 112 arranged along a second direction. In the first direction, the solder strips 190 on the front side 1131 of two adjacent battery cells 113 of two adjacent first battery strings 111 are connected in parallel through a first busbar 120, and the solder strips 190 on the back side 1132 of two adjacent battery cells 113 of two adjacent second battery strings 112 are connected in parallel through a second busbar 130. At the same time, the solder strips 190 on the back side 1132 of the battery cells 113 at the end of the first battery string 111 away from the first busbar 120 are connected in parallel. The solder strips 190 on the front side 1131 of the cell 113 at the end of the second cell string 112 opposite to the second busbar 130 are connected in series through the third busbar 140. In this way, based on the above-mentioned arrangement of the cell unit 1, by constructing the overlap area between the third busbar 140 and the first cell string 111 to be larger than the overlap area between the third busbar 140 and the second cell string 112, the third busbar 140 can be arranged to overlap with the cell string 110 at least partially, thereby reducing the encroachment of the third busbar 140 on the module's planar space. This allows for a reduction in the module area of ​​the photovoltaic module while ensuring that the module power remains unchanged, which helps to increase the available cell area and improve the working efficiency of the photovoltaic module.

[0036] It should be noted that, since the third busbar 140 can be arranged to at least partially overlap with the battery string 110, such as Figure 6 and Figure 8 As shown, since the third busbar 140 is located at the end of the battery string 110 along the first direction, it can be understood that by arranging the third busbar 140 to at least partially overlap with the battery string 110, the process distance S3 reserved between the end busbar 2 (which can also be understood as the third busbar 140 in this application) and the battery cell 113 can be saved, for example, in the related art. At the same time, the encroachment of the end busbar 2 (which can also be understood as the third busbar 140 in this application) on the module plane space can also be reduced. Thus, while ensuring that the module power of the photovoltaic module remains unchanged, the module area of ​​the photovoltaic module can be reduced, which helps to increase the area of ​​the cells that can be laid out and is conducive to improving the working efficiency of the photovoltaic module.

[0037] Furthermore, by constructing the overlap area between the third busbar 140 and the first battery string 111 to be larger than the overlap area between the third busbar 140 and the second battery string 112, the third busbar 140 can be located at least partially inside the first battery string 111, and at least partially outside the second battery string 112. Thus, when the third busbar 140 is connected to the solder ribbon 190 on the back side 1132 of the battery cell 113 of the first battery string 111, and when the third busbar 140 is connected to the solder ribbon 190 on the front side 1131 of the battery cell 113 of the second battery string 112, the connection to the third busbar 140 can be achieved without, for example, flipping or bending the solder ribbon 190 to the other side. This makes the operation convenient and reduces the difficulty of the process.

[0038] It should be noted that, as Figures 2 to 6 As shown, since there is a third gap 1133 between two adjacent battery cells 113 in the first battery string 111 and the second battery string 112 in the first direction, the third gap 1133 is used for the solder ribbon 190 between the two adjacent battery cells 113 to pass through, so that the solder ribbon 190 is connected to different sides of the two adjacent battery cells 113. For example, the solder ribbon 190 can be connected to the front side 1131 (e.g., negative electrode) of one of the two adjacent battery cells 113 and connected to the back side 1132 (e.g., positive electrode) of the other battery cell 113.

[0039] However, due to the series connection of the multiple battery cells 113, when the busbar (e.g., the third busbar 140) at the end of the battery string 110 connects two adjacent battery strings (e.g., the first battery string 111 and the second battery string 112) in series, and the third busbar 140 is arranged to overlap the battery string 110, for example, taking the third busbar 140 completely arranged on the back side 1132 of the first battery string 111 and the second battery string 112 as an example, in this arrangement, the solder strips 190 on the back side 1132 of the battery cells 113 of the first battery string 111 are directly connected to the battery string 111. In order to connect the third busbar 140 to the third busbar 140, the solder ribbon 190 on the front side 1131 of the battery cell 113 of the second battery string 112 can also be connected to the third busbar 140. For this purpose, the solder ribbon 190 on the front side 1131 of the battery cell 113 of the second battery string 112 needs to be flipped or bent to the other side (e.g., the back side 1132 of the battery cell 113 of the second battery string 112) to connect with the third busbar 140 located on the back side 1132 of the battery cell 113 of the second battery string 112. Since the solder ribbon 190 needs to be flipped or bent, it is not convenient to process and manufacture on site, which increases the process difficulty.

[0040] Therefore, to address the problem that the solder strip 190 needs to be flipped or bent, which is inconvenient for on-site processing and increases the difficulty of the process, this disclosure refers to... Figure 6 As shown, by constructing the overlap area between the third busbar 140 and the first battery string 111 to be larger than the overlap area between the third busbar 140 and the second battery string 112, this disclosure allows the third busbar 140 to be at least partially located inside the first battery string 111 while also being at least partially located outside the second battery string 112. With this arrangement, even when the third busbar 140 is completely arranged on the back surface 1132 of the first battery string 111, a portion of the third busbar 140 will still be exposed to the outside of the second battery string 112. Thus, while ensuring that the back surface 1132 of the battery cells 113 of the first battery string 111 is at least partially exposed, this arrangement also ensures that the third busbar 140 is at least partially located outside the second battery string 112. While the solder ribbon 190 on 132 is directly connected to the third busbar 140, the solder ribbon 190 on the front side 1131 of the cell 113 of the second battery string 112 can also extend directly to the outside of the second battery string 112 and be directly connected to the exposed part of the third busbar 140 to the outside of the second battery string 112. In this way, without performing operations such as flipping or bending the solder ribbon 190, the first battery string 111 and the second battery string 112 can be connected in series through the third busbar 140. This facilitates on-site processing and preparation, and also eliminates the need to limit the specific structure of the cell 113, realizing the series connection of any battery structure.

[0041] Furthermore, it can be understood that the front side 1131 of the aforementioned solar cell 113 can be understood as the light-receiving surface of the photovoltaic module, and correspondingly, the back side 1132 of the aforementioned solar cell 113 can be understood as the backlighting surface of the photovoltaic module. Alternatively, the front side 1131 of the aforementioned solar cell 113 can also be understood as the backlighting surface of the photovoltaic module, and correspondingly, the back side 1132 of the aforementioned solar cell 113 can also be understood as the light-receiving surface of the photovoltaic module. However, it should be noted that, in order to ensure that the module power of the photovoltaic module remains unchanged, the module area of ​​the photovoltaic module is reduced, the area of ​​the cells that can be arranged is increased, and the photovoltaic module efficiency is improved. For the purpose of improving work efficiency, this disclosure uses the front side 1131 of the aforementioned solar cell 113 as the light-receiving surface of the photovoltaic module and the corresponding back side 1132 of the aforementioned solar cell 113 as the back light-receiving surface of the photovoltaic module as an example. In this way, by setting the busbar on the back side 1132 of the aforementioned solar cell 113, it is possible to avoid the busbar from blocking the light-receiving surface of the photovoltaic module and thus affecting the illumination area of ​​the light-receiving surface of the photovoltaic module (e.g., the front side 1131 of the solar cell 113). This is beneficial to ensure that the photovoltaic module has a high module power while also reducing the module area of ​​the photovoltaic module, which helps to increase the area of ​​the cells that can be laid out.

[0042] In some implementations, reference Figures 1 to 7 As shown, the second battery string 112 can be offset relative to the side of the first battery string 111 facing the second busbar 130, so that a first gap 150 is reserved at the end of the second battery string 112 away from the second busbar 130 to avoid at least part of the third busbar 140. With this arrangement, by indenting the second battery string 112 inward relative to the side of the first battery string 111 facing the second busbar 130, it is easy to reduce the module area of ​​the photovoltaic module and increase the area of ​​the cells that can be laid out while keeping the module power of the photovoltaic module unchanged. This is conducive to improving the working efficiency of the photovoltaic module. At the same time, the first battery string 111 and the second battery string 112 can be connected in series through the third busbar 140 without performing operations such as flipping or bending the solder strip 190, which effectively reduces the process difficulty.

[0043] Furthermore, it is understood that, based on the arrangement of the battery cells 1 provided in this disclosure, such as Figure 6 As shown, since the two second battery strings 112 in the two sets of battery strings 110 arranged side by side along the first direction are recessed inward relative to the side of the corresponding first battery string 111 facing the second busbar 130, the arrangement space of the busbar can be saved by twice while ensuring that the power of the photovoltaic module remains unchanged. This effectively reduces the module area of ​​the photovoltaic module, increases the area of ​​the cells that can be arranged, and helps to improve the working efficiency of the photovoltaic module.

[0044] Considering that in order to facilitate the series connection of the first battery string 111 and the second battery string 112 via the third busbar 140, in some embodiments, reference is made to... Figures 1 to 7 As shown, the third busbar 140 may include a first connecting segment 141 connected to the first battery string 111 and a second connecting segment 142 connected to the second battery string 112. The orthographic projection of the first connecting segment 141 on the photovoltaic module is at least partially located inside the back surface 1132 of the battery cell 113 at the end of the first battery string 111 away from the first busbar 120. The orthographic projection of the second connecting segment 142 on the photovoltaic module is at least partially located inside the first gap 150. This arrangement is to reduce the module area of ​​the photovoltaic module and increase the area of ​​the cells that can be laid out while ensuring that the module power of the photovoltaic module remains unchanged, thereby improving the working efficiency of the photovoltaic module. At the same time, the first battery string 111 and the second battery string 112 can be connected in series through the third busbar 140 without performing operations such as flipping or bending on the solder strip 190, which effectively reduces the process difficulty.

[0045] In addition, it is understandable that by adaptively designing the overlap area between the third busbar 140 and the solar cell 113, the area of ​​the module that can be saved can be adaptively adjusted.

[0046] For example, in some exemplary embodiments, references Figures 1 to 6 As shown, the first connecting segment 141 can be projected onto the photovoltaic module and located inside the back surface 1132 of the cell 113 at the end of the first cell string 111 opposite to the first busbar 120. The solder ribbon 190 on the back surface 1132 of the cell 113 at the end of the first cell string 111 opposite to the first busbar 120 can be directly connected to the first connecting segment 141. Furthermore, the second connecting segment 142 can be projected onto the photovoltaic module and located inside the first gap 150. The solder ribbon 190 on the front surface 1131 of the cell 113 at the end of the second cell string 112 opposite to the second busbar 130 extends to the outside of the cell 113 and connects to the first connecting segment 141. The third busbar 140 is connected to the second connecting section 142 within the module. This arrangement allows the third busbar 140 to be completely hidden behind the back 1132 of the solar cell 113, avoiding the problem of the third busbar 140 obscuring the front 1131 (e.g., the light-receiving surface) of the solar cell 113 and affecting the light-receiving area. Simultaneously, it effectively reduces the module area of ​​the photovoltaic module, increasing the available cell area while maintaining the same module power. Furthermore, it allows for series connection of the first cell string 111 and the second cell string 112 via the third busbar 140 without requiring any flipping or bending of the solder strip 190, effectively reducing manufacturing complexity. This disclosure is not limited to this.

[0047] Additionally, it should be noted that the specific embodiment in which the second connecting segment 142 can be projected onto the photovoltaic module and located inside the first gap 150 is exemplary. For example, in some alternative embodiments, refer to... Figure 7 As shown, the orthographic projection of the second connecting segment 142 on the photovoltaic module can be partially located inside the first gap 150. When the orthographic projection of the second connecting segment 142 on the photovoltaic module is partially located inside the first gap 150, a first insulating structure 160 can be provided between the second connecting segment 142 and the back surface 1132 of the cell 113 at the end of the second battery string 112 away from the second busbar 130. In this way, by providing the first insulating structure 160, the solder strip 190 on the back surface 1132 of the cell 113 can be prevented from connecting to the second connecting segment 142, which can effectively reduce the possibility of short circuit between the positive and negative terminals of the cell 113.

[0048] In this disclosure, the specific structure, material and connection and fixing method of the first insulation structure 160 are not specifically limited. Those skilled in the art can design it adaptively according to actual application needs. The purpose is to avoid short-circuiting of the positive and negative terminals of the battery cell 113.

[0049] Additionally, in some implementations, references Figures 1 to 6 As shown, a second gap 170 can be provided between two adjacent cells 113 of two adjacent first battery strings 111 in the first direction to avoid at least a portion of the first busbar 120, so that the orthographic projection of the first busbar 120 on the photovoltaic module is at least partially located inside the second gap 170. This arrangement ensures that a portion of the structure of the first busbar 120 is always exposed to the outside of the first battery strings 111. Thus, when two adjacent first battery strings 111 in the first direction are connected in parallel via the first busbar 120, the two first battery strings 111... The solder strip 190 on the front side 1131 of each battery cell 113 can extend directly to the outside of the first battery string 111 and be directly connected to the exposed part of the first busbar 120 to the outside of the first battery string 111. In this way, without the need to perform operations such as flipping or bending the solder strip 190, the two adjacent first battery strings 111 in the first direction can be connected in parallel through the first busbar 120. This facilitates on-site processing and preparation, and also eliminates the need to limit the specific structure of the battery cell 113, realizing the parallel connection of any battery structure.

[0050] Understandably, by adaptively designing the overlap area between the first busbar 120 and the solar cell 113, the area of ​​the components that can be saved can be adaptively adjusted.

[0051] For example, in some exemplary embodiments, references Figures 1 to 6As shown, the orthographic projection of the first busbar 120 on the photovoltaic module can be located inside the second gap 170. Furthermore, the solder strips 190 on the front surfaces 1131 of the two adjacent cells 113 of the two adjacent first cell strings 111 in the first direction each extend to the outside of the cell 113 and connect to the first busbar 120 located within the second gap 170. With this arrangement, the two adjacent first cell strings 111 in the first direction can be connected in parallel via the first busbar 120 without requiring any flipping or bending of the solder strips 190. This arrangement also simplifies the overall structure design of the photovoltaic module, facilitates on-site fabrication, and reduces the complexity of the manufacturing process. This disclosure is not limited to this.

[0052] Additionally, it should be noted that the specific embodiment in which the orthographic projection of the first busbar 120 on the photovoltaic module is located inside the second gap 170 is exemplary. For example, in some alternative embodiments, refer to... Figure 7 As shown, the orthogonal projection of the first busbar 120 on the photovoltaic module can be partially located inside the second gap 170. When the orthogonal projection of the first busbar 120 on the photovoltaic module is partially located inside the second gap 170, a second insulating structure 180 can be provided between the first busbar 120 and the back surface 1132 of the two adjacent cells 113 of the two adjacent first cell strings 111 in the first direction. In this way, by providing the second insulating structure 180, the solder strip 190 on the back surface 1132 of the cell 113 can be prevented from connecting to the first busbar 120, which can effectively reduce the possibility of short circuit between the positive and negative terminals of the cell 113.

[0053] In this disclosure, the specific structure, material and connection and fixing method of the second insulation structure 180 are not specifically limited. Those skilled in the art can design it adaptively according to actual application needs. The purpose is to avoid short-circuiting of the positive and negative terminals of the battery cell 113.

[0054] Additionally, in some implementations, references Figures 1 to 6 As shown, the orthographic projection of the second busbar 130 on the photovoltaic module can be at least partially located inside the back surface 1132 of the two adjacent cells 113 of the two adjacent second cell strings 112 in the first direction, and the solder strips 190 on the back surface 1132 of the two adjacent cells 113 of the two adjacent second cell strings 112 in the first direction are each connected to the second busbar 130. This arrangement facilitates the direct connection of the solder strips 190 on the back surface 1132 of the two adjacent cells 113 of the two adjacent second cell strings 112 in the first direction to the second busbar 130, without the need for operations such as flipping or bending the solder strips 190, which helps to reduce the difficulty of the process.

[0055] Furthermore, it is understood that adaptively designing the overlap area between the second busbar 130 and the battery cell 113 can achieve adaptive adjustments to save component area. For example, in some exemplary embodiments, refer to... Figure 6 As shown, in order to minimize the module area of ​​the photovoltaic module and increase the area of ​​the cells that can be laid out, the distance between two adjacent cells 113 of two adjacent second cell strings 112 in the first direction can be reduced, or even arranged so that two adjacent cells 113 of two adjacent second cell strings 112 in the first direction are attached together. However, it should be noted that when the two cells 113 are attached together, the attachment point of the two cells 113 needs to be insulated to avoid short circuits between the two cells 113. The specific method of insulating the attachment point of the two cells 113 is not specifically limited in this disclosure. For example, a third insulation structure (not shown) can be set between the two cells 113, the purpose of which is to avoid short circuits between the two cells 113. Those skilled in the art can design it adaptively according to actual application requirements.

[0056] Alternatively, in some implementations, reference is made to Figures 1 to 7 As shown, the multiple cells 113 of the two first battery strings 111 arranged side by side along the first direction can be arranged symmetrically about the first busbar 120. This arrangement facilitates the on-site installation and preparation of photovoltaic modules, making the operation convenient and the process less difficult.

[0057] Additionally, in some implementations, references Figures 1 to 7 As shown, the multiple cells 113 of the two second battery strings 112 arranged side by side along the first direction can be arranged symmetrically about the second busbar 130, so as to facilitate the on-site installation and preparation of photovoltaic modules, and to make the operation convenient and the process less difficult.

[0058] It is understood that in other embodiments not shown, the two battery strings 110 arranged side by side along the first direction (e.g., the first battery string 111 and / or the second battery string 112) may not be arranged symmetrically with respect to the corresponding busbars (e.g., the first busbar 120 and the second busbar 130). This disclosure does not specifically limit such variations, and those skilled in the art can design them adaptively according to actual application requirements.

[0059] Furthermore, in some implementations, references Figure 1 and Figure 6As shown, the number of battery cells 1 can be multiple and arranged side by side along the second direction. The adjacent first busbar 120 and second busbar 130 of two adjacent battery cells 1 are connected so that multiple battery cells 1 are connected in series. This arrangement can reduce the module area of ​​the photovoltaic module while ensuring that the module power of the photovoltaic module remains unchanged, which helps to improve the working efficiency of the photovoltaic module and has the advantage of lower process difficulty.

[0060] In this disclosure, the number of battery cells 1 can be three, but it is understood that the number of battery cells 1 can also be a positive integer such as one, two, or four. This disclosure does not make a specific limitation on this, and those skilled in the art can design it adaptively according to actual application needs.

[0061] It should be noted that the specific shape, structure and dimensions of the busbars (e.g., the first busbar 120, the second busbar 130 and the third busbar 140) are not specifically limited in this disclosure. Those skilled in the art can design them adaptively according to actual application needs. The purpose is to ensure that the busbars meet the usage requirements, such as resistivity and process requirements.

[0062] For example, in some embodiments, the width of the first busbar 120 along the first direction can be 4mm-8mm, such as 4mm, 6mm, 8mm, etc., and this disclosure is not limited thereto.

[0063] In addition, in some embodiments, the thickness of the first busbar 120 can be 0.3mm-0.5mm, for example, the thickness of the first busbar 120 can be 0.3mm, 0.4mm, 0.5mm, etc., and this disclosure is not limited thereto.

[0064] Optionally, in some embodiments, the width of the second busbar 130 along the first direction can be 8mm-15mm, for example, the width of the second busbar 130 along the first direction can be 8mm, 10mm, 12mm, 15mm, etc., and this disclosure is not limited thereto.

[0065] In addition, in some embodiments, the thickness of the second busbar 130 can be 0.05mm-0.25mm, for example, the thickness of the second busbar 130 can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, etc., and this disclosure is not limited thereto.

[0066] Optionally, in some embodiments, the width of the third busbar 140 along the first direction can be 4mm-8mm, for example, the width of the third busbar 140 along the first direction can be 4mm, 6mm, 8mm, etc., and this disclosure is not limited thereto.

[0067] In addition, in some embodiments, the thickness of the third busbar 140 can be 0.05mm-0.25mm, for example, the thickness of the third busbar 140 can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, etc., and this disclosure is not limited thereto.

[0068] According to a second aspect of this disclosure, a photovoltaic system is provided, comprising the photovoltaic module provided in the first aspect. This photovoltaic system possesses all the beneficial effects of the photovoltaic module provided in the first aspect, which will not be elaborated further herein.

[0069] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0070] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0071] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A photovoltaic module, characterized in that, The photovoltaic module includes: A battery cell includes two sets of battery strings arranged side by side along a first direction. Each set of battery strings includes a first battery string and a second battery string arranged along a second direction. The first battery string and the second battery string each include a plurality of battery cells arranged side by side and connected in series along the first direction. Each battery cell has a front facing the first side of the photovoltaic module and a back facing the second side of the photovoltaic module. The solder strips on the front sides of two adjacent cells of two adjacent first battery strings in the first direction are connected in parallel by a first busbar. The solder strips on the back sides of two adjacent cells of two adjacent second battery strings in the first direction are connected in parallel by a second busbar. The solder strips on the back sides of the cells of the first battery string at the end opposite to the first busbar and the solder strips on the front sides of the cells of the second battery string at the end opposite to the second busbar in the same group are connected in series by a third busbar. Wherein, the overlap area between the third busbar and the first battery string is greater than the overlap area between the third busbar and the second battery string.

2. The photovoltaic module according to claim 1, characterized in that, The second battery string is offset relative to the first battery string on the side facing the second busbar, so as to reserve a first gap at the end of the second battery string away from the second busbar to avoid at least part of the third busbar.

3. The photovoltaic module according to claim 2, characterized in that, The third busbar includes a first connecting segment connected to the first battery string and a second connecting segment connected to the second battery string. The orthographic projection of the first connecting segment on the photovoltaic module is at least partially located inside the back of the battery cell at one end of the first battery string opposite to the first busbar. The orthographic projection of the second connecting segment on the photovoltaic module is at least partially located inside the first gap.

4. The photovoltaic module according to claim 3, characterized in that, The orthographic projection of the first connecting segment on the photovoltaic module is located inside the back of the cell at one end of the first battery string away from the first busbar, and the solder strip on the back of the cell at one end of the first battery string away from the first busbar is connected to the first connecting segment. The second connecting segment's orthographic projection on the photovoltaic module is located inside the first gap, and the solder strip on the front side of the cell at the end of the second cell string opposite to the second busbar extends to the outside of the cell and connects to the second connecting segment located inside the first gap.

5. The photovoltaic module according to claim 3, characterized in that, When the orthographic projection of the second connecting segment on the photovoltaic module is located inside the first gap, a first insulating structure is provided between the second connecting segment and the back of the cell at the end of the second battery string opposite to the second busbar.

6. The photovoltaic module according to claim 2, characterized in that, There is a second gap between two adjacent cells of two adjacent first cell strings in a first direction to avoid at least part of the first busbar, such that the orthographic projection of the first busbar on the photovoltaic module is at least partially located inside the second gap.

7. The photovoltaic module according to claim 6, characterized in that, The first busbar's orthographic projection on the photovoltaic module is located inside the second gap, and the solder strips on the front surfaces of two adjacent cells of two adjacent first cell strings in the first direction extend to the outside of the cell and connect to the first busbar located in the second gap.

8. The photovoltaic module according to claim 6, characterized in that, When the orthographic projection of the first busbar on the photovoltaic module is located inside the second gap, a second insulating structure is provided between the first busbar and the back sides of two adjacent cells of two adjacent first cell strings in the first direction.

9. The photovoltaic module according to claim 2, characterized in that, The orthographic projection of the second busbar on the photovoltaic module is at least partially located inside the back side of two adjacent cells of two adjacent second cell strings in the first direction, and the solder strips on the back side of two adjacent cells of two adjacent second cell strings in the first direction are each connected to the second busbar.

10. The photovoltaic module according to claim 1, characterized in that, Multiple battery cells of two first battery strings arranged side-by-side along a first direction are symmetrically arranged about the first busbar; and / or, Multiple battery cells of two second battery strings arranged side by side along the first direction are symmetrically arranged about the second busbar.

11. The photovoltaic module according to claim 1, characterized in that, The width of the first busbar along the first direction is 4mm-8mm; and / or, The thickness of the first busbar is 0.3mm-0.5mm; and / or, The width of the second busbar along the first direction is 8mm-15mm; and / or, The thickness of the second busbar is 0.05mm-0.25mm; and / or, The width of the third busbar along the first direction is 4mm-8mm; and / or, The thickness of the third busbar is 0.05mm-0.25mm.

12. The photovoltaic module according to any one of claims 1-11, characterized in that, The battery cells are multiple and arranged side by side along the second direction. The adjacent first busbars and second busbars of two adjacent battery cells are connected so that the multiple battery cells are connected in series.

13. A photovoltaic system, characterized in that, The photovoltaic system includes the photovoltaic module as described in any one of claims 1-12.

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