Photovoltaic module

Abstract

The utility model relates to the field of photovoltaic technology, and especially relates to a photovoltaic assembly. The photovoltaic module includes a plurality of cell strings and a bus bar. The plurality of battery strings are sequentially arranged along a first direction. The battery string comprises a plurality of battery pieces which are sequentially connected in series in a second direction perpendicular to the first direction, and the battery pieces are back contact batteries. The two battery pieces at the head end and the tail end in each battery string are defined as interconnected battery pieces, a positive electrode confluence area and a negative electrode confluence area are formed on each interconnected battery piece, and the positive electrode confluence areas and the negative electrode confluence areas are parallel to each other and extend in the first direction. The bus bars are arranged on the back surfaces of the two interconnected battery pieces in the two adjacent battery strings and used for electrically connecting the positive electrode confluence area of one interconnected battery piece with the negative electrode confluence area of the other interconnected battery piece, and the bus bars extend in the first direction. The length of the photovoltaic module can be shortened, the size of the photovoltaic module is reduced, the usage amount of materials such as glass and adhesive films is further reduced, consumables are saved, and the cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic technology field especially relates to a photovoltaic module. BACKGROUND

[0002] Back contact cell (abbreviated as BC cell) realizes the effective utilization of the whole area of the light receiving surface of the cell by processing the front electrode structure to be totally back-placed. This unique electrode arrangement mode effectively improves the capture efficiency of incident light and significantly enhances the photoelectric conversion performance of the photovoltaic module, which shows significant advantages in the energy output of the photovoltaic system.

[0003] The current industry still follows the traditional crystalline silicon cell technology route for the packaging process of the BC cell module, mainly referring to the standardized packaging scheme of the TOPCon module and the PERC module. This technology inheritance leads to inherent defects in the busbar layout design of the BC module: the conventional three-section busbar arrangement mode (end-middle-end) forces the photovoltaic module to maintain a specific aspect ratio, causing unnecessary extension of the longitudinal size of the photovoltaic module. This structural redundancy increases the unit power consumption of the packaging materials (including photovoltaic glass, polymer backsheet, and EVA adhesive film, etc.), thereby increasing the cost, and ultimately weakening the comprehensive competitiveness of the BC cell in the terminal market.

[0004] Therefore, it is urgent to design a photovoltaic module to solve the above technical problems. SUMMARY

[0005] The utility model aims at providing a photovoltaic module to solve the technical problems of large size and high cost of the photovoltaic module in the prior art.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides a photovoltaic module, which comprises:

[0008] A plurality of cell strings are arranged in sequence along a first direction;

[0009] The cell string comprises a plurality of cell pieces connected in sequence along a second direction perpendicular to the first direction, and the cell piece is a back contact cell;

[0010] Two cell pieces defining the head and tail of each cell string are interconnected cell pieces, and the interconnected cell pieces form a positive busbar area and a negative busbar area, and the positive busbar area and the negative busbar area are parallel to each other and extend along the first direction;

[0011] The bus bar is arranged on the back of two adjacent interlinked battery pieces in the two adjacent battery strings and is used to electrically connect the positive bus area of one of the interlinked battery pieces and the negative bus area of the other interlinked battery piece, and the bus bar extends along a first direction.

[0012] As an optional technical solution of the photovoltaic module, the interlinked battery piece has a first side extending along the first direction and a second side extending along the second direction, and the positive bus area and the negative bus area are arranged along the first side.

[0013] As an optional technical solution of the photovoltaic module, the back of the interlinked battery piece is provided with a positive bus grid line and a negative bus grid line, the positive bus grid line is located in the positive bus area, and the negative bus grid line is located in the negative bus area; the bus bar electrically connects the positive bus grid line in one of the interlinked battery pieces and the negative bus grid line in the other interlinked battery piece.

[0014] As an optional technical solution of the photovoltaic module, the battery string includes a plurality of first battery strings and a plurality of second battery strings, the plurality of first battery strings are arranged along the first direction, the plurality of second battery strings are arranged along the first direction, and the first battery string and the second battery string are oppositely arranged along a second direction.

[0015] The first battery string includes a plurality of first battery pieces connected in series, and the second battery string includes a plurality of second battery pieces connected in series.

[0016] As an optional technical solution of the photovoltaic module, the back of the first battery piece and the back of the second battery piece are formed with positive grid lines and negative grid lines alternately arranged along the first direction.

[0017] In two adjacent first battery pieces of one of the first battery strings, the positive grid line in one of the first battery pieces is connected in series with the negative grid line in the other first battery piece.

[0018] In two adjacent second battery pieces of one of the second battery strings, the positive grid line in one of the second battery pieces is connected in series with the negative grid line in the other second battery piece.

[0019] As an optional technical solution of the photovoltaic module, the photovoltaic module further includes a junction box, the junction box is provided with a bypass diode; the first battery string and the second battery string oppositely arranged along the second direction are connected in parallel to each other and to the same bypass diode.

[0020] As an optional technical scheme of the photovoltaic module, the battery strings are arranged in multiple, and the bus bars are arranged in multiple, and the multiple battery strings are connected in series through the bus bars;

[0021] In the second direction, both ends of each of the battery strings have the interconnection cell pieces.

[0022] As an optional technical scheme of the photovoltaic module, the positive bus area is provided with a positive welding strip, and the negative bus area is provided with a negative welding strip;

[0023] In the two interconnection cell pieces connected in series, the bus bar is connected with the positive welding strip on the surface of one of the interconnection cell pieces and the negative welding strip on the surface of the other interconnection cell piece.

[0024] The bus bar, the positive welding strip and the negative welding strip are parallel and arranged along the first direction.

[0025] As an optional technical scheme of the photovoltaic module, in the second direction, the width of the bus bar is not less than the width of the positive welding strip, and the width of the bus bar is not less than the width of the negative welding strip.

[0026] As an optional technical scheme of the photovoltaic module, the cell piece is a half cell piece or a multi-piece cell piece.

[0027] The beneficial effects of the photovoltaic module at least include:

[0028] The utility model provides a kind of photovoltaic module, which comprises a plurality of battery strings and bus bars. The plurality of battery strings are arranged in series along a first direction. The battery string comprises a plurality of cell pieces connected in series along a second direction perpendicular to the first direction, and the cell piece is a back contact cell. The two cell pieces defining the head and tail of each battery string are interconnection cell pieces, and the interconnection cell piece forms a positive bus area and a negative bus area. The positive bus area and the negative bus area are parallel to each other and extend along the first direction. The bus bar is used to connect two adjacent battery strings in series. The bus bar is arranged on the back surface of the two interconnection cell pieces in the adjacent two battery strings and electrically connects the positive bus area of one interconnection cell piece and the negative bus area of the other interconnection cell piece. The bus bar extends along the first direction.

[0029] The first end and the last end of the battery piece of the battery string are defined as the interconnection battery piece, and the positive electrode busbar area and the negative electrode busbar area parallel to each other are arranged on the interconnection battery piece and extend along the first direction, that is, the positive electrode busbar area and the negative electrode busbar area are located at the long side of the interconnection battery piece. In the two battery strings adjacent along the first direction, the busbar is connected by connecting the positive electrode busbar area of the interconnection battery piece in one of the battery strings and the negative electrode busbar area of the interconnection battery piece in the other battery string, so as to realize the series connection of the two adjacent battery strings and realize the current conduction. In other words, the busbar cover of the utility model is arranged on the positive electrode busbar area of the interconnection battery piece in one of the battery strings and the negative electrode busbar area of the interconnection battery piece in the other battery string, so that the busbar can be directly contacted and stacked with the interconnection battery piece, avoiding the problem that the busbar is arranged outside the battery string in the prior art, thereby extending the longitudinal size of the photovoltaic module, so that the length of the photovoltaic module can be shortened as much as possible, the size of the photovoltaic module is reduced, and the use amount of glass, adhesive film and other materials is reduced, thereby saving materials and reducing costs. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the drawings needed in the description of the embodiments of the utility model will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the contents of the embodiments of the utility model and the drawings by those skilled in the art without creating labor.

[0031] Figure 1 It is a structural schematic diagram of the photovoltaic module provided by the embodiments of the utility model;

[0032] Figure 2 It is a structural schematic diagram of the busbar and the interconnection battery piece in the two adjacent battery strings provided by the embodiments of the utility model; Figure 1 ;

[0033] Figure 3 It is a structural schematic diagram of the busbar and the interconnection battery piece in the two adjacent battery strings provided by the embodiments of the utility model;

[0034] Figure 4 It is a structural schematic diagram of the busbar and the interconnection battery piece in the two adjacent battery strings provided by the embodiments of the utility model;

[0035] Figure 5 It is a structural schematic diagram of the busbar and the interconnection battery piece in the two adjacent battery strings provided by the embodiments of the utility model; Figure 2 ;

[0036] Figure 6A circuit diagram of a photovoltaic module is provided by the embodiment of the utility model.

[0037] Reference signs

[0038] 100, first battery string; 110, first cell; 120, interconnection cell; 1201, first side; 1202, second side; 1203, positive busbar; 1204, negative busbar; 1205, positive main grid; 1206, negative main grid;

[0039] 200, second battery string; 210, second cell;

[0040] 300, busbar; 400, positive welding strip; 500, negative welding strip; 600, junction box. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. The components of the embodiments of the utility model described and shown in the drawings can be arranged and designed in various different configurations.

[0042] Therefore, the following detailed description of the embodiments of the utility model provided in the drawings is not intended to limit the scope of the claimed utility model, but only represents selected embodiments of the utility model. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the utility model.

[0043] It should be noted that: similar signs and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0044] In the description of the utility model, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly placed when the utility model product is used, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second", "third" and the like are only used for differentiation in description and cannot be understood as indicating or implying relative importance. In the description of the utility model, unless otherwise specified, the meaning of "multiple" is two or more.

[0045] In the description of the utility model, still need to explain, unless have explicit provision and limitation, term " set ", " connection " should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connect, can be mechanical connection, also can be electrical connection. For ordinary skilled person in the art, can understand the concrete meaning of above-mentioned term in the utility model with specific circumstances.

[0046] In the utility model, unless have explicit provision and limitation, first feature is " on " or " under " second feature can include that first and second features are in direct contact, also can include that first and second features are not in direct contact but are in contact through additional features between them. Moreover, first feature is " on ", " above " and " on " second feature includes that first feature is directly above and obliquely above second feature, or only indicates that the horizontal height of first feature is higher than that of second feature. First feature is " under ", " below " and " under " second feature includes that first feature is directly below and obliquely below second feature, or only indicates that the horizontal height of first feature is less than that of second feature.

[0047] The embodiments of the utility model are described in detail below, examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the utility model, and cannot be understood as limiting the utility model.

[0048] The embodiment provides a photovoltaic module to solve the technical problems of large size and high cost of the photovoltaic module in the prior art.

[0049] As shown in the figure, the photovoltaic module mainly comprises a plurality of cell strings and a bus bar 300. Wherein, the plurality of cell strings are sequentially arranged along a first direction. The cell string comprises a plurality of cell pieces connected in series along a second direction perpendicular to the first direction, and the cell piece is a back contact cell. Figures 1-5 The two cell pieces defining the head and tail of each cell string are both interconnected cell pieces 120, and the interconnected cell pieces 120 are formed with a positive bus area and a negative bus area, and the positive bus area and the negative bus area are parallel to each other and extend along the first direction. The bus bar 300 is used to connect two adjacent cell strings in series, and the bus bar 300 is arranged on the back surface of the two interconnected cell pieces 120 in the adjacent two cell strings and is used to electrically connect the positive bus area of one interconnected cell piece 120 and the negative bus area of the other interconnected cell piece 120, and the bus bar 300 extends along the first direction. It should be noted that the first direction in the embodiment is the X-axis direction in the

[0050] Figure 1 Figure 1 ​​Y-axis direction in the figure.

[0051] Based on the above design, in the embodiment, the battery pieces at the head and tail of the battery string are defined as the interconnection battery piece 120, and the interconnection battery piece 120 has the positive busbar area and the negative busbar area parallel to each other and extending along the first direction, that is, the positive busbar area and the negative busbar area are located at the long side of the interconnection battery piece 120. In the two battery strings adjacent along the first direction, the busbar 300 is connected with the positive busbar area of the interconnection battery piece 120 in one of the battery strings and the negative busbar area of the interconnection battery piece 120 in the other battery string, so as to realize the series connection of the two adjacent battery strings and realize the current conduction. In other words, the busbar 300 in the embodiment covers the positive busbar area of the interconnection battery piece 120 in one of the battery strings and covers the negative busbar area of the interconnection battery piece 120 in the other battery string, so that the busbar 300 can be directly in contact with and stacked on the interconnection battery piece 120, avoiding the problem of the extension of the longitudinal size of the photovoltaic module caused by the busbar 300 being placed outside the battery string in the prior art, so that the length of the photovoltaic module can be shortened as much as possible, the size of the photovoltaic module is reduced, and the use amount of materials such as glass and adhesive film is reduced, thereby saving materials and reducing costs.

[0052] The busbar 300 in the embodiment is located at the long side of the interconnection battery piece 120, that is, the extension direction of the busbar 300 is parallel to the short side direction of the photovoltaic module, so that the photovoltaic module in the embodiment can be applied to the packaging equipment in the prior art, achieving the purpose of saving costs. Because the busbar 300 in the prior art is also parallel to the short side direction of the photovoltaic module, the photovoltaic module in the embodiment can be well compatible with the existing packaging equipment in the packaging process, reducing or avoiding the modification of the packaging equipment.

[0053] Optionally, the busbar 300 in the embodiment is located at the back of the interconnection battery piece 120. That is, the busbar 300 is hiddenly arranged, so that the busbar 300 can be as much as possible to reduce the shading of light, ensure that the effective light receiving area of the photovoltaic module does not change, and further does not affect the power generation efficiency of the photovoltaic module. In addition, in the actual processing operation process, the processing and stacking process of the photovoltaic module is usually inverted stacking, that is, the front glass, the front adhesive film and the battery piece (including the interconnection battery piece 120) are placed in turn. It can be understood that the back of the interconnection battery piece 120 is upward at this time, and the busbar 300 in the embodiment is arranged at the back of the interconnection battery piece 120, so that the convenience and operability of the connection between the busbar 300 and the solder strip are improved, thereby improving the work efficiency. At the same time, the appearance of the photovoltaic module can be improved.

[0054] In the embodiment, the structure of the battery piece at the head end and the tail end of the battery string is specially designed, that is, the positive busbar area and the negative busbar area are arranged on the battery piece at the head end and the tail end, thereby forming the interconnected battery piece 120. In this way, the positive and negative poles of the battery piece do not need to be physically isolated by using the insulating glue during the series connection process, thereby saving the cost and improving the operation efficiency.

[0055] As shown in Figure 2 , in the embodiment, the interconnected battery piece 120 has a first side edge 1201 extending along a first direction and a second side edge 1202 extending along a second direction, and the positive busbar area and the negative busbar area are arranged along the first side edge 1201; the first side edge 1201 is the long side direction of the interconnected battery piece 120, and the second side edge 1202 is the short side direction of the interconnected battery piece 120.

[0056] Further, the back surface of the interconnected battery piece 120 is provided with a positive busbar grid line 1203 and a negative busbar grid line 1204, the positive busbar grid line 1203 is located in the positive busbar area, and the negative busbar grid line 1204 is located in the negative busbar area; the busbar 300 is electrically connected with the positive busbar grid line 1203 in one interconnected battery piece 120 and the negative busbar grid line 1204 in another interconnected battery piece 120. The formation of the positive busbar grid line 1203 and the negative busbar grid line 1204 is beneficial to the export of the current in the battery string.

[0057] Optionally, as shown in Figure 1 , in some optional embodiments, the positive busbar grid line 1203 and the negative busbar grid line 1204 can be arranged on each battery piece in the battery string, the positive busbar grid line 1203 is connected with the positive main grid 1205 on the battery piece, and the negative busbar grid line 1204 is connected with the negative main grid 1206 on the battery piece.

[0058] Optionally, as shown in Figures 4-5 , in the embodiment, the battery piece at the head end and the tail end in the battery string (that is, the interconnected battery piece 120) is provided with the positive busbar grid line 1203 and the negative busbar grid line 1204, and the battery piece in the middle part of the battery string is only provided with the positive main grid 1205 and the negative main grid 1206, and the positive main grid 1205 and the negative main grid 1206 are arranged in the first direction.

[0059] As shown in Figure 1 and Figure 4 , in the embodiment, the battery string includes a plurality of first battery strings 100 and a plurality of second battery strings 200, the plurality of first battery strings 100 are arranged along the first direction, the plurality of second battery strings 200 are arranged along the first direction, the first battery string 100 and the second battery string 200 extend along the second direction, and the first battery string 100 and the second battery string 200 are oppositely arranged.

[0060] The first battery string 100 comprises a plurality of first battery pieces 110 connected in series, the second battery string 200 comprises a plurality of second battery pieces 210 connected in series, and the first battery string 100 and the second battery string 200 are both provided in a plurality of sets. The bus bar 300 is arranged on the back of two adjacent first battery strings 100 and / or two adjacent second battery strings 200, and the bus bar 300 is located at the long side of the first battery piece 110 or the long side of the second battery piece 210, and the bus bar 300 is used to connect two adjacent first battery pieces 110 or two adjacent second battery pieces 210. It can be understood that the first battery piece 110 at the head and the tail of the first battery string 100 in the embodiment is the interconnection battery piece 120, and the second battery piece 210 at the head and the tail of the second battery string 200 is the interconnection battery piece 120.

[0061] As shown in Figure 1 and Figure 5 , a plurality of first battery pieces 110 in the first battery string 100 are connected in series, a plurality of second battery pieces 210 in the second battery string 200 are connected in series, and the first battery string 100 and the second battery string 200 are connected in parallel with each other, thereby forming a battery unit with a hybrid circuit structure. Alternatively, the first battery piece 110 and the second battery piece 210 in the embodiment are both half-piece battery pieces or multi-piece battery pieces. That is, they can be provided as half-piece battery pieces (two-piece battery pieces), three-piece battery pieces, four-piece battery pieces, and the like.

[0062] In the embodiment, the back of the first battery piece 110 and the back of the second battery piece 210 are both formed with positive and negative grid lines alternately arranged in the first direction. In two adjacent first battery pieces 110 in one first battery string 100, the positive grid line in one of the first battery pieces 110 is connected in series with the negative grid line in the other first battery piece 110, thereby realizing the series connection of the plurality of first battery pieces 110. In two adjacent second battery pieces 210 in one second battery string 200, the positive grid line in one of the second battery pieces 210 is connected in series with the negative grid line in the other second battery piece 210, thereby realizing the series connection of the plurality of second battery pieces 210.

[0063] As shown in Figures 1-5 , the battery string in the embodiment is provided in a plurality of sets, the bus bar 300 is provided in a plurality of sets, and the plurality of battery strings are connected in series through the bus bar 300; along the second direction, both ends of each battery string have an interconnection battery piece 120.

[0064] As shown in Figure 1 and Figure 4As shown, along the second direction, in the same column of the first battery string 100 and the second battery string 200: the positive grid line on the interconnection cell 120 in the first battery string 100 is connected with the positive grid line on the interconnection cell 120 in the second battery string 200; or, the negative grid line on the interconnection cell 120 in the first battery string 100 is connected with the negative grid line on the interconnection cell 120 in the second battery string 200, so that the first battery string 100 and the second battery string 200 are connected in parallel, thereby realizing the parallel connection of the first battery string 100 and the second battery string 200.

[0065] As shown in the embodiment, the positive bus bar region is provided with a positive solder strip 400, and the negative bus bar region is provided with a negative solder strip 500. In the two interconnection cells 120 connected in series, the bus bar 300 is connected to the positive solder strip 400 on the surface of one interconnection cell 120 and the negative solder strip 500 on the surface of the other interconnection cell 120. The bus bar 300, the positive solder strip 400, and the negative solder strip 500 are parallel and extend along the first direction. In other words, a part of the bus bar 300 is connected to the positive solder strip 400, and another part of the bus bar 300 is connected to the negative solder strip 500. This can enable the adjacent two first battery strings 100 or the adjacent two second battery strings 200 to be connected in series, thereby realizing the conduction of current. Figures 1-3 Preferably, in the embodiment, the positive bus bar region has one positive solder strip 400, and the negative bus bar region has one negative solder strip 500. This can minimize the width of the bus bar 300, save materials, and reduce the shading of light.

[0066] Further, the bus bar 300 is parallel to the positive solder strip 400 and the negative solder strip 500. This can minimize the increase in the width of the photovoltaic module, save materials, and avoid the problem of local short circuit caused by the bus bar 300 overlapping other positive solder strips 400 or negative solder strips 500.

[0067] As shown in the embodiment, along the second direction, the width of the bus bar 300 is not less than the width of the positive solder strip 400 connected to the bus bar 300, and the width of the bus bar 300 is not less than the width of the negative solder strip 500 connected to the bus bar 300. This can improve the stability and reliability of the connection between the bus bar 300, the positive solder strip 400, and the negative solder strip 500, reduce or avoid the problem of false welding, and improve the yield of the photovoltaic module.

[0068] Figure 3 As shown in the embodiment, along the second direction, the width of the bus bar 300 is not less than the width of the positive solder strip 400 connected to the bus bar 300, and the width of the bus bar 300 is not less than the width of the negative solder strip 500 connected to the bus bar 300. This can improve the stability and reliability of the connection between the bus bar 300, the positive solder strip 400, and the negative solder strip 500, reduce or avoid the problem of false welding, and improve the yield of the photovoltaic module.

[0069] As shown in the embodiment, along the second direction, the width of the bus bar 300 is not less than the width of the positive solder strip 400 connected to the bus bar 300, and the width of the bus bar 300 is not less than the width of the negative solder strip 500 connected to the bus bar 300. This can improve the stability and reliability of the connection between the bus bar 300, the positive solder strip 400, and the negative solder strip 500, reduce or avoid the problem of false welding, and improve the yield of the photovoltaic module. Figure 1 and​Figure 6 As shown, the photovoltaic module in the embodiment further comprises a junction box 600, the junction box 600 is internally provided with a bypass diode; the first cell string 100 and the second cell string 200 oppositely arranged along the second direction are connected to the same bypass diode in parallel with each other, so that the first cell string 100 and the second cell string 200 form a parallel circuit. The junction box 600 is connected with a photovoltaic inverter outside to facilitate the conversion of direct current generated by the photovoltaic module into alternating current.

[0070] Optionally, the junction box 600 in the embodiment is arranged at intervals to be multiple, so that the connection of each cell unit can be more flexible, the stable transmission of current and voltage is ensured, and thus the power generation power and efficiency of the photovoltaic module as a whole are improved. At the same time, it can also be applied to different application scenarios, and the flexible applicability is improved.

[0071] As Figure 6 shown, the photovoltaic module is provided with three junction boxes 600, and Figure 6 The arrow direction in the embodiment is the transmission direction of electrons, and the transmission direction of current is opposite to the transmission direction of electrons.

[0072] Obviously, the above is only the preferred embodiment of the present application and the technical principle applied. It will be understood by those skilled in the art that the present application is not limited to the specific embodiments herein, and those skilled in the art can make various obvious changes, re-adjustments and substitutions without departing from the protection scope of the present application. Therefore, although the present application has been described in more detail through the above embodiments, the present application is not limited to the above embodiments, and can include more other equivalent embodiments without departing from the concept of the present application, and the scope of the present application is determined by the scope of the appended claims.

[0073] Note that in the description of the present specification, the description referring to the terms "some embodiments", "other embodiments", and the like means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. A photovoltaic module, characterized in that, include: Multiple battery strings are arranged sequentially along the first direction; The battery string includes a plurality of battery cells connected in series along a second direction perpendicular to the first direction, and the battery cells are back-contact batteries; Each of the battery strings is defined as having two interconnected battery cells (120) at the beginning and end. The interconnected battery cells (120) have a positive current-collecting area and a negative current-collecting area formed on them, and the positive current-collecting area and the negative current-collecting area are parallel to each other and both extend along a first direction. A busbar (300) is connected in series with two adjacent battery strings. The busbar (300) is disposed on the back side of two interconnected battery cells (120) in the two adjacent battery strings and is used to electrically connect the positive current-carrying area of ​​one interconnected battery cell (120) to the negative current-carrying area of ​​the other interconnected battery cell (120). The busbar (300) extends along a first direction.

2. The photovoltaic module according to claim 1, characterized in that, The interconnected battery cell (120) has a first side (1201) extending along the first direction and a second side (1202) extending along the second direction, and the positive electrode current-collecting region and the negative electrode current-collecting region are both extended along the first side (1201).

3. The photovoltaic module according to claim 2, characterized in that, The back side of the interconnected battery cell (120) is provided with a positive electrode busbar (1203) and a negative electrode busbar (1204), the positive electrode busbar (1203) is located in the positive electrode busbar region, and the negative electrode busbar (1204) is located in the negative electrode busbar region; the busbar (300) electrically connects the positive electrode busbar (1203) in one of the interconnected battery cells (120) with the negative electrode busbar (1204) in another interconnected battery cell (120).

4. The photovoltaic module according to claim 1, characterized in that, The battery string includes a plurality of first battery strings (100) and a plurality of second battery strings (200), the plurality of first battery strings (100) are arranged along the first direction, the plurality of second battery strings (200) are arranged along the first direction, and the first battery strings (100) and the second battery strings (200) are arranged opposite to each other along the second direction; The first battery string (100) includes a plurality of first battery cells (110) connected in series, and the second battery string (200) includes a plurality of second battery cells (210) connected in series.

5. The photovoltaic module according to claim 4, characterized in that, Both the back side of the first battery cell (110) and the back side of the second battery cell (210) are formed with positive and negative grid lines alternately arranged along the first direction; In two adjacent first battery cells (110) of a first battery string (100), the positive grid line in one of the first battery cells (110) is connected in series with the negative grid line in the other first battery cell (110); In a second battery string (200), in two adjacent second battery cells (210), the positive grid line in one second battery cell (210) is connected in series with the negative grid line in the other second battery cell (210).

6. The photovoltaic module according to claim 4, characterized in that, The photovoltaic module also includes a junction box (600), which is provided with a bypass diode; the first battery string (100) and the second battery string (200) arranged opposite each other along the second direction are connected in parallel and connected to the same bypass diode.

7. The photovoltaic module according to claim 1, characterized in that, The battery strings are configured as multiple, the busbars (300) are configured as multiple, and the multiple battery strings are connected in series through the busbars (300); Along the second direction, each of the battery strings has interconnected battery cells (120) at both ends.

8. The photovoltaic module according to claim 1, characterized in that, A positive electrode solder strip (400) is provided in the positive electrode busbar area, and a negative electrode solder strip (500) is provided in the negative electrode busbar area; In two interconnected battery cells (120) connected in series, the busbar (300) simultaneously connects the positive electrode solder strip (400) on the surface of one interconnected battery cell (120) and the negative electrode solder strip (500) on the surface of the other interconnected battery cell (120). The busbar (300), the positive electrode solder strip (400), and the negative electrode solder strip (500) are arranged in parallel and extend along the first direction.

9. The photovoltaic module according to claim 8, characterized in that, Along the second direction, the width of the busbar (300) is not less than the width of the positive electrode solder strip (400), and the width of the busbar (300) is not less than the width of the negative electrode solder strip (500).

10. The photovoltaic module according to any one of claims 1-9, characterized in that, The battery cell is a half-cell battery cell or a multi-cell battery cell.

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