CN215771183U - Photovoltaic module - Google Patents

Abstract

The utility model discloses a photovoltaic module, comprising: the battery pack comprises a plurality of battery strings, a plurality of battery plates and a plurality of back electrodes, wherein the plurality of battery strings are arranged along a string arrangement direction, each battery string comprises a plurality of battery plates which are arranged along a battery string extension direction perpendicular to the string arrangement direction, the back surface of each battery plate is provided with a plurality of back electrodes, the plurality of battery plates in each battery string are connected in series through a plurality of interconnection structural members, and at least one part of each interconnection structural member is connected to the back surface of each battery plate through the back electrode and is opposite to the back electrodes; the first bus bars extend along the serial arrangement direction, are connected with the interconnection structural member, and are located on one side of the interconnection structural member, which is far away from the battery piece. According to the photovoltaic module, the first bus bar does not need to occupy the space in the length direction of the photovoltaic module, meanwhile, the hidden crack and hot spot effect of a cell can be avoided, and the output power of the photovoltaic module is ensured.

Description

Photovoltaic module

Technical Field

The utility model relates to the technical field of photovoltaic manufacturing, in particular to a photovoltaic module.

Background

In the related art, each cell string of the photovoltaic module generally includes two sub-cell strings, and two adjacent sub-cell strings are generally connected in parallel by a central bus bar along the extending direction of the cell string. However, the arrangement of the central bus bar increases the length of the photovoltaic module, and the cells adjacent to the central bus bar are prone to generate a hot spot effect, which affects the output power of the photovoltaic module.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a photovoltaic module, in which the first bus bar may not occupy a space in a length direction of the photovoltaic module, the first bus bar may be reliably connected to the cell, and meanwhile, hidden cracking and hot spot effect of the cell may be avoided, and output power of the photovoltaic module is ensured.

A photovoltaic module according to an embodiment of the present invention includes: the battery pack comprises a plurality of battery strings, wherein the battery strings are arranged along a string arrangement direction, each battery string comprises a plurality of battery sheets which are arranged along a battery string extending direction perpendicular to the string arrangement direction, the back surface of each battery sheet is provided with a plurality of back electrodes, the plurality of battery sheets in each battery string are connected in series through a plurality of interconnection structural members, and at least one part of each interconnection structural member is connected to the back surfaces of the battery sheets through the back electrodes and is opposite to the back electrodes; at least one first bus bar, the first bus bar extends along the string direction, the first bus bar is connected with the interconnect structure, the first bus bar is located at the side of the interconnect structure far away from the battery piece.

According to the photovoltaic module provided by the embodiment of the utility model, the first bus bar is connected to one side of the interconnection structure far away from the cell slice, and at least one part of the interconnection structure is connected to the back surface of the cell slice and is opposite to the plurality of back electrodes. Therefore, compared with the traditional photovoltaic module, the first bus bar can be used for accommodating more cells in the same area without occupying the space in the length direction of the photovoltaic module, the generated energy of the unit area of the photovoltaic module is improved, the first bus bar can be reliably connected to the cells, meanwhile, the hidden cracking and hot spot effect of the cells can be avoided, and the output power of the photovoltaic module is ensured.

According to some embodiments of the utility model, the first bus bar is opposite to at least a portion of the back electrode.

According to some embodiments of the utility model, a width of the first bus bar is smaller than a length of the corresponding back electrode in the cell string extending direction.

According to some embodiments of the utility model, the first bus bar is located in a non-back electrode region of the back side of the cell sheet.

According to some embodiments of the utility model, the first bus bar is located between two adjacent back electrodes.

According to some embodiments of the utility model, a width of the first bus bar is smaller than a minimum distance between two adjacent back electrodes in a direction in which the cell string extends.

According to some embodiments of the utility model, the minimum distance between two adjacent back electrodes is L, wherein L satisfies: l is more than or equal to 8mm and less than or equal to 12 mm.

According to some embodiments of the utility model, the width of the first bus bar is W, the thickness of the first bus bar is H, wherein W, H respectively satisfy: w is not less than 1mm₁≤8mm，0.08mm≤H≤0.4mm。

According to some embodiments of the utility model, the W further satisfies: w is more than or equal to 2mm and less than or equal to 6 mm.

According to some embodiments of the utility model, the photovoltaic module further comprises: and the second bus bar is connected to the back of the battery piece and extends along the extending direction of the battery strings.

According to some embodiments of the utility model, the second bus bar is located between a side edge of the cell sheet and the interconnecting structure adjacent to the side edge of the cell sheet.

According to some embodiments of the utility model, a distance between the second bus bar and the side edge of the battery piece in the extending direction of the battery string is L₁The minimum distance between the second bus bar and the interconnection structural member closest to the plurality of interconnection structural members and the second bus bar is L₂Wherein, said L₁、L₂Respectively satisfy: l is₁≥5mm，L₂≥2mm。

According to some embodiments of the utility model, the second bus bar has a width W₁The thickness of the second bus bar is H₁Wherein, the W₁、H₁Respectively satisfy: w is not less than 2mm₁≤8mm，0.08mm≤H₁≤0.4mm。

According to some embodiments of the utility model, the second bus bar comprises: a main body section extending in the cell string extending direction; the photovoltaic module comprises a main body section, at least one end section and at least one connecting piece, wherein the main body section is arranged on the main body section, the end section is arranged at one end of the main body section, the end section and the main body section are arranged at intervals, and the end section and the main body section are introduced into a junction box of the photovoltaic module.

According to some embodiments of the utility model, the minimum distance between the end section and the main body section is L₃Wherein, said L₃Satisfies the following conditions: l is not less than 3mm₃≤8mm。

Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic view of a photovoltaic module according to an embodiment of the present invention;

fig. 2 is a schematic view of a photovoltaic module according to an embodiment of the present invention, wherein the second bus bar is not shown;

FIG. 3 is a schematic view of a photovoltaic module according to another embodiment of the present invention;

FIG. 4 is a cross-sectional view of a photovoltaic module according to an embodiment of the present invention;

fig. 5 is a schematic view of an assembly of a first bus bar and a string of cells of a photovoltaic module according to an embodiment of the utility model;

fig. 6 is a schematic view of an assembly of a first bus bar and a cell string of a photovoltaic module according to another embodiment of the present invention.

Reference numerals:

100: a photovoltaic module;

1: a battery string; 11: a battery piece; 111: a back electrode; 2: an interconnecting structural member;

3: a first bus bar; 4: a second bus bar; 41: a main body section; 42: an end section.

Detailed Description

A photovoltaic module 100 according to an embodiment of the present invention is described below with reference to fig. 1-6.

As shown in fig. 1 to 6, a photovoltaic module 100 according to an embodiment of the present invention includes a plurality of cell strings 1 and at least one first bus bar 3. In the description of the present invention, "a plurality" means two or more.

Specifically, the plurality of cell strings 1 are arranged in a string arrangement direction (for example, a left-right direction in fig. 1), each cell string 1 includes a plurality of cell sheets 11 arranged in a direction (for example, an up-down direction in fig. 1) in which the cell string 1 extends, a back surface of each cell sheet 11 is provided with a plurality of back electrodes 111, the plurality of cell sheets 11 in each cell string 1 are connected in series by a plurality of interconnection structures 2, and at least a portion of the interconnection structures 2 is connected to the back surface of the cell sheet 11 through the back electrodes 111 and is opposite to the plurality of back electrodes 111.

For example, in the example of fig. 1 and 2, the photovoltaic module 100 includes five cell strings 1, each cell string 1 includes thirty-two cell sheets 11, the back surface of each cell sheet 11 is provided with six back electrode strings, the six back electrode strings are arranged along the string arrangement direction, each back electrode string includes two back electrodes 111 arranged along the string extension direction, and six interconnection structures 2 are in one-to-one correspondence with the six back electrode strings to connect two adjacent cell sheets 11 in series. Therefore, the plurality of interconnecting structural members 2 can lead out the current generated by the plurality of battery sheets 11 of the battery string 1 through the photovoltaic effect, and ensure that the photovoltaic module 100 has higher output power. Moreover, because the plurality of cell strings 1 are arranged along the string arrangement direction and the plurality of cell pieces 11 of each cell string 1 are arranged along the extending direction of the cell string 1, the circuit design is simple, all the cell pieces 11 can be regularly and relatively tightly arranged, and the reduction of the occupied space of the whole photovoltaic module 100 is facilitated while the electric connection between the adjacent cell pieces 11 in the cell string 1 is facilitated.

At least one part of the interconnection structure member 2 is opposite to the back electrodes 111, so that the shielding of the interconnection structure member 2 on the cell 11 can be reduced, the photoelectric conversion efficiency of the cell 11 can be ensured, and the output power of the photovoltaic module 100 can be ensured.

Five battery strings 1 are shown in fig. 1 and 2 for illustrative purposes, but it is obvious to those skilled in the art after reading the technical solution of the present application that the solution can be applied to other numbers of battery strings 1, which also falls within the protection scope of the present invention.

The first bus bars 3 extend along the serial arrangement direction, the first bus bars 3 are connected with the interconnection structure member 2, and the first bus bars 3 are located on one side of the interconnection structure member 2 away from the battery pieces 11. Referring to fig. 1 to 3, the first bus bar 3 extends linearly, the number of the cell pieces 11 of the plurality of cell strings 1 located on the same side of the first bus bar 3 is equal, and the first bus bar 3 is electrically connected to the interconnection structure 2 on the back side of the five cell strings 1 of the photovoltaic module 100. With such an arrangement, on one hand, the first bus bar 3 does not need to occupy the space in the length direction of the photovoltaic module 100, and the distance between two adjacent battery pieces 11 in the battery string 1 can be smaller, so that the photovoltaic module 100 with the same area can accommodate a larger number of battery pieces 11, and the power generation amount of the photovoltaic module 100 per unit area is improved; on the other hand, the interconnection structure 2 has good solderability, the first bus bar 3 can be reliably connected to the cell 11 by connecting the first bus bar 3 to the interconnection structure 2, the cell 11 can be prevented from being hidden and cracked due to the direct contact between the first bus bar 3 and the cell 11, and the hot spot effect of the cell 11 adjacent to the first bus bar 3 can be prevented.

According to the photovoltaic module 100 of the embodiment of the utility model, the first bus bar 3 is connected to the side of the interconnection structure 2 far away from the cell sheet 11, and at least a part of the interconnection structure 2 is connected to the back surface of the cell sheet 11 and is opposite to the plurality of back electrodes 111. Therefore, compared with the traditional photovoltaic module, the first bus bar 3 can be used for accommodating a larger number of battery pieces 11 in the photovoltaic module 100 with the same area without occupying the space in the length direction of the photovoltaic module 100, so that the power generation amount of the photovoltaic module 100 per unit area is improved, the first bus bar 3 can be reliably connected to the battery pieces 11, meanwhile, the hidden crack and hot spot effect of the battery pieces 11 can be avoided, and the output power of the photovoltaic module 100 is ensured.

According to some embodiments of the present invention, the first bus bar 3 is opposite to at least a portion of the back electrode 111. For example, in the example of fig. 5, the first bus bar 3 may be completely opposite to the back electrode 111. So set up, can reduce sheltering from to battery piece 11, guaranteed first busbar 3 effectively to photovoltaic module 100 for example the two-sided rate in back of dual glass assembly to can guarantee photovoltaic module 100's photoelectric conversion efficiency, and then guarantee photovoltaic module 100's output.

Further, the width of the first bus bar 3 is smaller than the length of the corresponding back electrode 111 in the extending direction of the cell string 1. Therefore, during installation, the first bus bar 3 can be prevented from deviating from the back electrode 111, so that the first bus bar 3 can be reliably connected to the interconnection structure 2, and meanwhile, the shielding of the first bus bar 3 on the cell 11 can be reduced, and the output power of the photovoltaic module 100 is ensured.

According to other embodiments of the present invention, the first bus bar 3 is located at a non-back electrode region of the back surface of the cell sheet 11. For example, referring to fig. 1, 4 and 5, the first bus bar 3 may be positioned between adjacent two back electrodes 111. So set up, make first busbar 3 can need not to occupy the space on the length direction of photovoltaic module 100 equally, the distance between two adjacent battery pieces 11 in the battery cluster 1 can be less, thereby make photovoltaic module 100 of the same area can hold more quantity battery pieces 11, improve photovoltaic module 100 unit area's generated energy, and simultaneously, can avoid battery cluster 1 cluster length tolerance or first busbar 3 skew to block back electrode 111, the aesthetic property of photovoltaic module 100's outward appearance has been guaranteed, and during the installation, first busbar 3 can be connected on interconnect structure 2 after flattening, thereby can reduce back packaging material's thickness when photovoltaic module 100 encapsulates, thereby can reduce photovoltaic module 100's cost.

Further, as shown in fig. 6, the width of the first bus bar 3 is smaller than the minimum distance between the adjacent two back electrodes 111 in the cell string extending direction. So set up, reserved sufficient space for the installation of first busbar 3, made things convenient for the installation of first busbar 3, and made first busbar 3 can be on a parallel with photovoltaic module 100's last side and downside, take place the skew when avoiding the installation of first busbar 3.

In some alternative embodiments, as shown in fig. 1, the minimum distance between two adjacent back electrodes 111 is L, where L satisfies: l is more than or equal to 8mm and less than or equal to 12 mm. When L is less than 8mm, the minimum distance between two adjacent back electrodes 111 is small, which may increase the number of back electrodes 111 on the cell 11, thereby increasing the shielding area of the cell 11 and reducing the output power of the photovoltaic module 100; when L > 12mm, the minimum distance between two adjacent back electrodes 111 is large, which may reduce the connection reliability of the interconnection structure 2 with the cell 11, so that the interconnection structure 2 is easily detached from the cell 11. Therefore, when L is more than or equal to 8mm and less than or equal to 12mm, the output power of the photovoltaic module 100 can be effectively ensured, and the interconnection structural member 2 can be reliably connected to the cell 11.

In some alternative embodiments, the width of the first bus bar 3 is W, and the thickness of the first bus bar 3 is H, wherein W, H respectively satisfy: w is not less than 1mm₁Not more than 8mm, not less than 0.08mm and not more than 0.4 mm. For example, when W < 1mm, the width of the first bus bar 3 is too small, so that the resistance of the first bus bar 3 is large, which may result in poor conductivity of the first bus bar 3, and since the first bus bar 3 is located on the back surface of the battery piece 11, the contact area between the first bus bar 3 and the battery piece 11 may be too small, increasing the risk of breaking the battery piece 11; when W > 8mm, the width of the first bus bar 3 is excessively large, resulting in a high cost of the first bus bar 3. When H < 0.08mm, the thickness of the first bus bar 3 is too small, so that the resistance of the first bus bar 3 is large, possibly resulting in poor conductivity of the first bus bar 3; when H > 0.4mm, the thickness of the first bus bar 3 is too large, increasing the risk of splitting the cell sheet 11 and resulting in higher cost of the photovoltaic module 100. Thus, W, H satisfy: w is not less than 1mm₁H is not less than 8mm and not more than 0.08mm and not more than 0.4mm, the width and the thickness of the first bus bar 3 are reasonable, on one hand, the first bus bar 3 has small resistance, strong conductive capability and low cost; on the other hand, the risk of splitting the cell 11 can be effectively reduced, and the reliability of the photovoltaic module 100 is ensured. Further optionally, W may further satisfy: w is more than or equal to 2mm and less than or equal to 6 mm.

According to some embodiments of the present invention, the photovoltaic module 100 further includes a second bus bar 4, the second bus bar 4 is connected to the back surface of the cell sheet 11, and the second bus bar 4 extends along the extending direction of the cell string 1. Referring to fig. 1 and 3, the first bus bar 3 and the second bus bar 4 are perpendicular to each other, and the entire second bus bar 4 is entirely located on the rear surface of the cell sheet 11 of the cell string 1. Therefore, the first bus bar 3 can transfer the current generated by the cell sheets 11 of the plurality of cell strings 1 through the photovoltaic effect to the second bus bar 4, and finally lead out through the second bus bar 4, so as to ensure that the photovoltaic module 100 has high output power. Moreover, since the second bus bar 4 is connected to the back of the cell 11, the size of the photovoltaic module 100 in the length direction can be reduced, the arrangement of the plurality of cells 11 of the cell string 1 can be more compact, and the occupied space of the photovoltaic module 100 can be reduced.

Further, the second bus bar 4 is located between the side edge of the cell piece 11 and the interconnecting structural member 2 adjacent to the above-mentioned side edge of the cell piece 11. As shown in fig. 1 and 3, two of the plurality of interconnection structures 2 of the cell string 1 connected to the second bus bar 4, which are located at both ends in the string arrangement direction, are first interconnection structures, and the second bus bar 4 is located between the first interconnection structure on the right side of the cell sheet 11 and the right side edge of the cell sheet 11. With the arrangement, the space between the first interconnection structural member on the right side of the cell 11 and the right side of the cell 11 can be effectively utilized, and the installation of the second bus bar 4 is facilitated, so that the assembly efficiency of the photovoltaic module 100 can be improved, and the contact area between the second bus bar 4 and the cell 11 is ensured, so that the second bus bar 4 can be reliably connected to the cell 11.

In some alternative embodiments, as shown in fig. 1, the distance between the second bus bar 4 and the side edge of the battery piece 11 in the extending direction of the battery string 1 is L₁The minimum distance between the second bus bar 4 and the closest interconnecting structural member 2 between the plurality of interconnecting structural members 2 and the second bus bar 4 is L₂Wherein L is₁、L₂Respectively satisfy: l is₁≥5mm，L₂Not less than 2 mm. Since the distance between the closest one of the plurality of interconnecting structural members 2 to the second bus bar 4 and the side edge of the battery piece 11 is approximately 15mm to 20mm (inclusive), L is set to be equal to or smaller than L₁、L₂Respectively satisfy: l is₁≥5mm，L₂The thickness of the second bus bar 4 is not less than 2mm, and the hidden crack of the second bus bar 4 caused by the shearing force between the cell 11 and the first bus bar 3 in the laminating process of the photovoltaic module 100 can be avoided, so that the cost of the photovoltaic module 100 can be reduced.

In some alternative embodiments, the width of the second bus bar 4 is W₁The thickness of the second bus bar 4 is H₁Wherein W is₁、H₁Respectively satisfy: w is not less than 2mm₁≤8mm，0.08mm≤H₁Less than or equal to 0.4 mm. For example, when W₁< 2mm, the width of the second bus bar 4 is too small, so thatThe resistance of the two bus bars 4 is high, which may cause the conductive capability of the second bus bar 4 to be weak, and since the second bus bar 4 is located on the back surface of the battery piece 11, the contact area between the second bus bar 4 and the battery piece 11 may be too small, which increases the risk of splitting the battery piece 11; when W is₁At > 8mm, the width of the secondary bus bar 4 is too large, resulting in a high cost of the secondary bus bar 4. When H is present₁When the thickness of the second bus bar 4 is less than 0.08mm, the resistance of the second bus bar 4 is large, which may cause the conductive ability of the second bus bar 4 to be weak; when H is present₁At > 0.4mm, the thickness of the second busbar 4 is too great, increasing the risk of splitting of the cell 11 and resulting in a higher cost of the photovoltaic group. Thereby, by making W₁、H₁Respectively satisfy: w is not less than 2mm₁≤8mm，0.08mm≤H₁The thickness of the second bus bar 4 is more reasonable than or equal to 0.4mm, and on one hand, the second bus bar 4 has smaller resistance, stronger conductive capability and lower cost; on the other hand, the risk of splitting the cell 11 can be effectively reduced, and the reliability of the photovoltaic module 100 is ensured.

According to some embodiments of the present invention, the second bus bar 4 includes a main body section 41 and at least one end section 42, the main body section 41 extending in the extending direction of the battery string 1. The end section 42 is located at one end of the main section 41, the end section 42 is spaced apart from the main section 41, and both the end section 42 and the main section 41 are introduced into the junction box of the photovoltaic module 100. For example, in the example in fig. 3, the second bus bar 4 may include two end sections 42, the two end sections 42 being respectively located at both ends of the main body section 41 in the longitudinal direction, positive lead wires being respectively provided on an end of one of the two end sections 42 and a corresponding end of the main body section 41, negative lead wires being respectively provided on an end of the other of the two end sections 42 and a corresponding end of the main body section 41, the two positive lead wires and the two negative lead wires being respectively connected to corresponding terminal boxes. Thus, the second bus bar 4 can transmit the current generated by the plurality of cells 11 of the plurality of cell strings 1 through the photovoltaic effect to the positive lead or the negative lead, and the positive lead or the negative lead can transmit the current to the junction box and lead out through the junction box.

In some alternative embodiments, as shown in fig. 3, the minimum distance between the end segment 42 and the main segment 41 is L₃Wherein L is₃Satisfies the following conditions: l is not less than 3mm₃Less than or equal to 8 mm. When L is₃When the distance between the end part section 42 and the main body section 41 is smaller than 3mm, the distance between the two positive electrode lead wires and the distance between the two negative electrode lead wires are possibly smaller, so that the convenience of connecting the positive electrode lead wires and the negative electrode lead wires with the junction box is influenced; when L is₃At > 8mm, the minimum distance between the end section 42 and the main body section 41 is large, which may cause the distance between the two positive lead wires and the distance between the two negative lead wires to be large, increasing the length of the photovoltaic module 100. Thus, when L is₃Satisfies the following conditions: l is not less than 3mm₃When being less than or equal to 8mm, the installation of the junction box is convenient, and the length of the photovoltaic module 100 can be reduced.

Other constructions and operations of the photovoltaic module 100 according to embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the utility model have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (15)

1. A photovoltaic module, comprising:

the battery pack comprises a plurality of battery strings, wherein the battery strings are arranged along a string arrangement direction, each battery string comprises a plurality of battery sheets which are arranged along a battery string extending direction perpendicular to the string arrangement direction, the back surface of each battery sheet is provided with a plurality of back electrodes, the plurality of battery sheets in each battery string are connected in series through an interconnection structural member, and at least one part of the interconnection structural member is connected to the back surfaces of the battery sheets and is opposite to the plurality of back electrodes;

at least one first bus bar, the first bus bar extends along the string direction, the first bus bar is connected with the interconnection structure, and the first bus bar is located on one side of the interconnection structure far away from the battery piece.

2. The photovoltaic module of claim 1, wherein the first bus bar opposes at least a portion of the back electrode.

3. The photovoltaic module of claim 2, wherein a width of the first bus bar is less than a length of the corresponding back electrode in a direction in which the cell string extends.

4. The photovoltaic module of claim 1, wherein the first bus bar is located in a non-back electrode area on the back side of the cell sheet.

5. The photovoltaic module of claim 4, wherein the first bus bar is positioned between two adjacent back electrodes.

6. The photovoltaic module of claim 5, wherein the width of the first bus bar is less than the minimum distance between two adjacent back electrodes in the cell string extending direction.

7. The photovoltaic module of claim 6, wherein the minimum distance between two adjacent back electrodes is L, wherein L satisfies: l is more than or equal to 8mm and less than or equal to 12 mm.

8. The photovoltaic module of claim 1, wherein the first bus bar has a width W and a thickness H, and wherein W, H respectively satisfy: w is more than or equal to 1mm and less than or equal to 8mm, and H is more than or equal to 0.08mm and less than or equal to 0.4 mm.

9. The photovoltaic module of claim 8, wherein W further satisfies: w is more than or equal to 2mm and less than or equal to 6 mm.

10. The photovoltaic module of any of claims 1-9, further comprising:

and the second bus bar is connected to the back of the battery piece and extends along the extending direction of the battery strings.

11. The photovoltaic assembly of claim 10, wherein the second bus bar is located between a side edge of the cell sheet and the interconnecting structure adjacent the side edge of the cell sheet.

12. The assembly according to claim 11, wherein a distance between the second bus bar and the side edge of the cell sheet in the cell string arrangement direction is L₁The minimum distance between the second bus bar and the interconnection structural member closest to the plurality of interconnection structural members and the second bus bar is L₂Wherein, said L₁、L₂Respectively satisfy: l is₁≥5mm，L₂≥2mm。

13. The photovoltaic module of claim 10, wherein the second bus bar has a width W₁The thickness of the second bus bar is H₁Wherein, the W₁、H₁Respectively satisfy: w is not less than 2mm₁≤8mm，0.08mm≤H₁≤0.4mm。

14. The photovoltaic module of claim 10, wherein the second bus bar comprises:

a main body section extending in the cell string extending direction;

the photovoltaic module comprises a main body section, at least one end section and at least one connecting piece, wherein the main body section is arranged on the main body section, the end section is arranged at one end of the main body section, the end section and the main body section are arranged at intervals, and the end section and the main body section are introduced into a junction box of the photovoltaic module.

15. The photovoltaic assembly of claim 14, wherein the minimum distance between the end section and the main body section is L₃Wherein, said L₃Satisfies the following conditions: l is not less than 3mm₃≤8mm。

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