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 the second direction. The two battery pieces, oppositely arranged in the first direction, of the two adjacent battery strings are defined as interconnected battery pieces, the interconnected battery pieces are located at the tail ends of the corresponding battery strings, and a positive electrode confluence area and a negative electrode confluence area are formed on the edges of the opposite sides of the two interconnected battery pieces respectively. And the bus bars are connected in series with two adjacent battery strings, are arranged on the back surfaces of two adjacent interconnected battery pieces and are used for electrically connecting the positive electrode confluence region of one interconnected battery piece with the negative electrode confluence region of the other interconnected battery piece. The bus bars are located at the short edges of the interconnected battery pieces, that is, the extension direction of the bus bars is parallel to the long edge direction of the photovoltaic module, so that the length of the photovoltaic module can be shortened as far as possible, the usage amount of materials such as glass and adhesive films is reduced, and consumables are saved.

Description

TECHNICAL FIELD

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

[0002] The back contact cell is also called BC cell, and because the front surface of the cell is free of grid lines, the front surface of the cell is entirely effective light receiving area, and the power generation efficiency of the photovoltaic module is improved.

[0003] In the prior art, the packaging mode of the photovoltaic module of the BC cell usually follows the packaging mode of the mainstream TOPCon photovoltaic module and PERC photovoltaic module on the market, and the bus bar of the BC photovoltaic module prepared by using this packaging mode is usually located at the two end positions and the middle position of the photovoltaic module, which increases the length of the photovoltaic module, increases the size of the photovoltaic module, increases the use amount of glass, back plate, adhesive film and other materials, and further increases the cost.

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

[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 scheme:

[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 of adjacent two cell strings are defined as interconnected cell pieces arranged oppositely along the first direction, and the interconnected cell pieces are located at the end of the corresponding cell string, and the edges of the two interconnected cell pieces on the same side form a positive bus area and a negative bus area respectively;

[0011] A bus bar is connected in series with adjacent two cell strings, and the bus bar is arranged on the back surface of adjacent two interconnected cell pieces and used to electrically connect the positive bus area of one interconnected cell piece and the negative bus area of the other interconnected cell piece.

[0012] As an optional technical scheme of the photovoltaic module, the interconnected cell 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 second side.

[0013] The interconnection battery piece is formed with a busbar line away from the first side of the same battery string.

[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 the 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 surface of the first battery piece and the back surface of the second battery piece are both formed with positive electrode grid lines and negative electrode grid lines alternately arranged along the first direction.

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

[0018] In the adjacent two second battery pieces of one second battery string, the positive electrode grid line in one of the second battery pieces is connected in series with the negative electrode 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 solution of the photovoltaic module, the battery string is arranged as a plurality of strings, the busbar is arranged as a plurality of busbars, and the plurality of battery strings are connected in series through the busbars.

[0021] Along the first direction, only one end of the edge battery string has the interconnection battery piece, and both ends of the middle-position battery string have the interconnection battery piece.

[0022] As an optional technical solution of the photovoltaic module, the positive electrode busbar area is provided with a positive electrode welding strip, and the negative electrode busbar area is provided with a negative electrode welding strip.

[0023] In the two interconnection battery pieces connected in series, the busbar simultaneously connects the positive electrode welding strip on the surface of one interconnection battery piece and the negative electrode welding strip on the surface of the other interconnection battery piece.

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

[0025] As an optional technical solution of the photovoltaic module, along the first direction, the width of the bus bar is not less than the distance between the positive electrode welding strip and the negative electrode welding strip.

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

[0027] The beneficial effects of the utility model at least include:

[0028] The utility model provides a kind of photovoltaic module, which comprises a plurality of cell strings and bus bars. Among them, a 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. Define two cell pieces of adjacent two cell strings as interconnection cell pieces arranged oppositely along the first direction, and the interconnection cell piece is located at the end of the corresponding cell string, and the edges of the two interconnection cell pieces on the opposite side form a positive bus area and a negative bus area. The bus bar is used to connect the adjacent two cell strings in series, and the bus bar is arranged on the back of the two adjacent interconnection cell pieces and used to electrically connect the positive bus area of one interconnection cell piece and the negative bus area of the other interconnection cell piece.

[0029] In the above, the cell piece at the end of the cell string is defined as the interconnection cell piece. In the adjacent two cell strings, the interconnection cell piece of one cell string has a positive bus area, and the interconnection cell piece of the other cell string has a negative bus area. The positive bus area and the negative bus area are oppositely arranged, i.e. the positive bus area and the negative bus area are both located at the short side of the interconnection cell piece. The interconnection strip connects the positive bus area and the negative bus area, thereby realizing the series connection of the adjacent two cell strings and the conduction of the current. In the utility model, the bus bar is located at the short side of the interconnection cell piece, in other words, the extension direction of the bus bar is parallel to the long side direction of the photovoltaic module. This can shorten the length of the photovoltaic module as much as possible, reduce the size of the photovoltaic module, and thereby reduce the usage amount of materials such as glass and adhesive film, save consumables, and save 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 for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the utility model and these drawings without creating labor.

[0031] Figure 1is a top view of the photovoltaic module provided by the embodiment of the utility model;

[0032] Figure 2 is the structural schematic view of the interconnection cell piece in the busbar and the adjacent two battery strings provided by the embodiment of the utility model;

[0033] Figure 3 is Figure 2 the section view at A in the middle;

[0034] Figure 4 is the grid line structure schematic view of the interconnection cell piece provided by the embodiment of the utility model;

[0035] Figure 5 is the schematic view of the parallel connection of the first battery string and the second battery string provided by the embodiment of the utility model;

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

[0037] Reference signs

[0038] 100, first battery string;110, first cell piece;130, interconnection cell piece;1301, first side edge;1302, second side edge;1303, busbar grid line;

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

[0040] 300, busbar;400, positive electrode welding strip;500, negative electrode 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 here 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 like reference numerals and letters refer to like elements throughout the several views, and that, once an element is defined in one view, it should not have to be further defined in subsequent views.

[0044] In the description of the utility model, it needs to be explained that the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship commonly placed when the utility model product is used, and is merely for the convenience of describing the utility model and simplifying the description, and does 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 "a plurality of" is two or more.

[0045] In the description of the utility model, it also needs to be explained that, unless otherwise explicitly specified and limited, the terms "set", "connected" should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or integrally connected, can be mechanically connected, or can be electrically connected. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0046] In the utility model, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or can include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "above", "upper" and "upper surface" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0047] The embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals 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 Figures 1-4As shown, the photovoltaic module mainly includes multiple cell strings and busbars 300. The multiple cell strings are arranged sequentially along a first direction. Each cell string includes multiple solar cells connected in series along a second direction perpendicular to the first direction, and the solar cells are back-contact cells.

[0050] Two battery cells arranged opposite each other in a first direction are defined as interconnected battery cells 130, and the interconnected battery cells 130 are located at the end of the corresponding battery cells. Positive current-collecting area and negative current-collecting area are formed on the edges of the two interconnected battery cells 130 facing each other.

[0051] The busbar 300 is used to connect two adjacent battery strings in series. The busbar 300 is disposed on the back of two adjacent interconnected battery cells 130 and electrically connects the positive current-carrying area of ​​one interconnected battery cell 130 to the negative current-carrying area of ​​the other interconnected battery cell 130. It should be noted that the first direction in this embodiment is... Figure 1 The X-axis direction in the diagram, the second direction is... Figure 1 The Y-axis direction in the diagram.

[0052] Based on the above design, in this embodiment, the battery cells at the end of the battery string are defined as interconnected battery cells 130. In two adjacent battery strings, the interconnected battery cell 130 of one battery string has a positive current-carrying area, and the interconnected battery cell 130 of the other battery string has a negative current-carrying area. The positive and negative current-carrying areas are arranged opposite to each other, that is, both are located at the short side of the interconnected battery cell 130. The interconnecting strip connects the positive and negative current-carrying areas, thereby achieving series connection between two adjacent battery strings and enabling current conduction. In this embodiment, the busbar 300 is located at the short side of the interconnected battery cell 130; in other words, the extension direction of the busbar 300 is parallel to the long side of the photovoltaic module. This minimizes the length and size of the photovoltaic module, thereby reducing the amount of glass, encapsulant, and other materials used, saving consumables and costs.

[0053] Optionally, in this embodiment, the busbar 300 is located on the back of the interconnected solar cell 130. That is, the busbar 300 is hidden, which minimizes the shading of light by the busbar 300, ensuring that the effective light-receiving area of ​​the photovoltaic module remains unchanged, thus not affecting the power generation efficiency of the photovoltaic module. Furthermore, in actual processing, the photovoltaic module stacking process is usually inverted, i.e., the front glass, front encapsulant film, and solar cells (including the interconnected solar cell 130) are laid out sequentially. Understandably, the back of the solar cells faces upwards in this case. However, in this embodiment, the busbar 300 is located on the back of the interconnected solar cell 130, which improves the convenience and operability of connecting the busbar 300 to the solder strip, thereby improving work efficiency. It also enhances the aesthetics of the photovoltaic module.

[0054] As shown in the drawings, Figure 4 In this embodiment, the interconnection battery piece 130 has a first side edge 1301 extending along a first direction, a second side edge 1302 extending along a second direction, and the positive and negative bus bars both extend along the second side edge 1302.

[0055] The first side edge 1301 of the interconnection battery piece 130 has a bus bar grid 1303. Specifically, the bus bar grid 1303 is formed on the first side edge 1301 of the interconnection battery piece 130 away from the same battery string. The positive bus bar grid is formed on the interconnection battery piece 130 in one of the battery strings, and the negative bus bar grid is formed on the interconnection battery piece 130 in the other battery string. Part of the positive bus bar grid is located in the positive bus bar area, and part of the negative bus bar grid is located in the negative bus bar area. The formation of the bus bar grid 1303 is conducive to the export of current in the battery string.

[0056] In some optional embodiments, a positive bus bar grid and a negative bus bar grid can be arranged on each battery piece in the battery string. The positive bus bar grid is connected to the positive main grid on the battery piece, and the negative bus bar grid is connected to the negative bus bar main grid on the battery piece.

[0057] As shown in the drawings, Figure 1 and Figure 5 In this 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 a first direction, and the plurality of second battery strings 200 are arranged along the first direction. The first battery string 100 and the second battery string 200 both extend along a second direction, and the first battery string 100 and the second battery string 200 are oppositely arranged.

[0058] The first battery string 100 includes a plurality of first battery pieces 110 connected in series, and the second battery string 200 includes a plurality of second battery pieces 210 connected in series. The first battery string 100 and the second battery string 200 are both arranged as a plurality. The bus bar 300 is arranged between adjacent two first battery strings 100 and / or adjacent two second battery strings 200, and the bus bar 300 is located at the short side of the first battery piece 110 or the short side of the second battery piece 210. The bus bar 300 is used to connect adjacent two first battery pieces 110 or adjacent two second battery pieces 210.

[0059] As shown in the drawings, Figure 1 and Figure 5As shown, multiple first battery cells 110 in the first battery string 100 are connected in series, multiple second battery cells 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 to form a battery cell with a hybrid circuit structure. Optionally, in this embodiment, both the first battery cell 110 and the second battery cell 210 are half-cell batteries or multi-cell batteries. That is, they can be configured as half-cell batteries (two-cell batteries), three-cell batteries, four-cell batteries, etc.

[0060] In this embodiment, positive and negative grid lines (not shown in the figure) are formed alternately along a first direction on the back side of the first battery cell 110 and the back side of the second battery cell 210. In two adjacent first battery cells 110 of a first battery string 100, the positive grid line in one first battery cell 110 is connected in series with the negative grid line in the other first battery cell 110, thereby realizing the series connection of multiple first battery cells 110. In two adjacent second battery cells 210 of a second battery string 200, 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, thereby realizing the series connection of multiple second battery cells 210.

[0061] like Figures 1-5 As shown, in this embodiment, the battery strings are configured as multiple strings, and the busbars 300 are configured as multiple units. The multiple battery strings are connected in series through the busbars 300. Along the first direction, the battery strings at the edges have interconnecting battery pieces 130 at only one end, while the battery strings in the middle have interconnecting battery pieces 130 at both ends.

[0062] like Figure 1 As 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 interconnecting cell 130 in the first battery string 100 is connected to the positive grid line on the interconnecting cell 130 in the second battery string 200; or, the negative grid line on the interconnecting cell 130 in the first battery string 100 is connected to the negative grid line on the interconnecting cell 130 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.

[0063] like Figures 2-5As shown, the positive electrode bus bar region in the embodiment is provided with the positive electrode solder strip 400, and the negative electrode bus bar region is provided with the negative electrode solder strip 500. In the two interconnected battery pieces 130 connected in series with each other, the bus bar 300 is connected to the positive electrode solder strip 400 on the surface of one interconnected battery piece 130 and the negative electrode solder strip 500 on the surface of the other interconnected battery piece 130. The bus bar 300, the positive electrode solder strip 400, and the negative electrode solder strip 500 are parallel and arranged along the second direction. In other words, a part of the bus bar 300 is connected to the positive electrode solder strip 400, and another part of the bus bar 300 is connected to the negative electrode solder strip 500. This can enable the adjacent two strings of the first battery string 100 or the adjacent two strings of the second battery string 200 to be connected in series, thereby realizing the conduction of current.

[0064] Preferably, in the embodiment, the positive electrode bus bar region has one positive electrode solder strip 400, and the negative electrode bus bar region has one negative electrode solder strip 500. This can minimize the width of the bus bar 300, save materials, and also reduce the shading of light.

[0065] Further, the bus bar 300 is parallel to the positive electrode solder strip 400 and the negative electrode solder strip 500. This can minimize the increase in the width of the photovoltaic module, save materials, and also avoid the problem of local short circuit caused by the bus bar 300 overlapping other positive electrode solder strips 400 or negative electrode solder strips 500.

[0066] As shown, Figure 3 along the first direction, the width of the bus bar 300 in the embodiment is not less than the distance between the positive electrode solder strip 400 and the negative electrode solder strip 500 connected to the bus bar 300. This can improve the stability and reliability of the connection between the bus bar 300 and the positive electrode solder strip 400 and the negative electrode solder strip 500, reduce or avoid the problem of false welding, and improve the yield of the photovoltaic module.

[0067] As shown, Figure 1 and Figure 6 The photovoltaic module in the embodiment further includes a junction box 600 provided with a bypass diode. The first battery string 100 and the second battery string 200 arranged opposite to each other along the second direction are connected in parallel to the same bypass diode, so that the first battery string 100 and the second battery string 200 form a parallel circuit. The junction box 600 is connected to the photovoltaic inverter outside to facilitate the conversion of the direct current generated by the photovoltaic module into alternating current.

[0068] Optionally, the junction box 600 in the embodiment is provided as a plurality of junction boxes at equal intervals. This can more flexibly connect each battery unit, ensure the stable transmission of current and voltage, thereby improving the overall power generation power and efficiency of the photovoltaic module. At the same time, it can also be applied to different application scenarios, improving the flexibility and applicability.

[0069] AsFigure 6 As shown, the photovoltaic module is provided with three junction boxes 600, and Figure 6 The arrow direction in the above is the transmission direction of the electron, and the transmission direction of the current is opposite to the transmission direction of the electron.

[0070] Obviously, the above only preferred embodiments of the present application and the use of technical principles. Those skilled in the art will understand that the present application is not limited to the specific embodiments here, those skilled in the art can be made various obvious changes, re-adjustment and replacement without departing from the scope of the present application. Therefore, although the above embodiments of the present application has been described in more detail, but the present application is not limited to the above embodiments, without departing from the concept of the present application, but also can include more other equivalent embodiments, and the scope of the present application is determined by the appended claims.

[0071] 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 by, The application relates to a photovoltaic module. The photovoltaic module comprises a plurality of battery strings arranged in sequence along a first direction. Each battery string comprises a plurality of battery pieces connected in sequence along a second direction perpendicular to the first direction, and each battery piece is a back contact battery. Two battery pieces of two adjacent battery strings arranged oppositely along the first direction are defined as interconnected battery pieces (130), and the interconnected battery pieces (130) are located at the ends of the corresponding battery strings, and the edges of the two interconnected battery pieces (130) on the same side form a positive bus area and a negative bus area respectively. A bus bar (300) is arranged between two adjacent battery strings, and the bus bar (300) is arranged on the back surface of the two interconnected battery pieces (130) and is used for electrically connecting the positive bus area of one interconnected battery piece (130) and the negative bus area of the other interconnected battery piece (130).

2. The photovoltaic module of claim 1, wherein, The interconnected battery piece (130) has a first side edge (1301) extending along the first direction and a second side edge (1302) extending along the second direction, and the positive bus area and the negative bus area are arranged along the second side edge (1302). The first side edge (1301) of the interconnected battery piece (130) away from the same battery string forms a bus grid line (1303).

3. The photovoltaic module of claim 1, wherein, The battery strings comprise 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 oppositely along the second direction. The first battery string (100) comprises a plurality of first battery pieces (110) connected in sequence, and the second battery string (200) comprises a plurality of second battery pieces (210) connected in sequence.

4. The photovoltaic module of claim 3, wherein, The back surface of the first battery piece (110) and the back surface of the second battery piece (210) are formed with positive grid lines and negative grid lines arranged alternately along the first direction. In two adjacent first battery pieces (110) of one first battery string (100), the positive grid line in one first battery piece (110) is connected in series with the negative grid line in the other first battery piece (110). In two adjacent second battery pieces (210) of one second battery string (200), the positive grid line in one second battery piece (210) is connected in series with the negative grid line in the other second battery piece (210).

5. The photovoltaic module of claim 3, wherein, The photovoltaic module further comprises a junction box (600) provided with a bypass diode, and the first battery string (100) and the second battery string (200) arranged oppositely along the second direction are connected in parallel to the same bypass diode.

6. The photovoltaic module of claim 1, wherein, The battery strings are arranged in multiple strings, the bus bars (300) are arranged in multiple, and the plurality of battery strings are connected in sequence through the bus bars (300). In the first direction, only one end of the edge of the battery string has the interconnection cell piece (130), and both ends of the battery string in the middle position have the interconnection cell piece (130).

7. The photovoltaic module of claim 1, wherein, The positive electrode bus bar area is provided with a positive electrode welding strip (400), and the negative electrode bus bar area is provided with a negative electrode welding strip (500), In the two interconnection cell pieces (130) connected in series with each other, the bus bar (300) is connected to the positive electrode welding strip (400) on the surface of one of the interconnection cell pieces (130) and the negative electrode welding strip (500) on the surface of the other interconnection cell piece (130) at the same time. The bus bar (300), the positive electrode welding strip (400) and the negative electrode welding strip (500) are parallel and arranged along the second direction.

8. The photovoltaic module of claim 7, wherein, In the first direction, the width of the bus bar (300) is not less than the distance between the positive electrode welding strip (400) and the negative electrode welding strip (500).

9. The photovoltaic module of any of claims 1-8, wherein, The cell piece is a half cell piece or a multi-piece cell piece.

Images