Photovoltaic module

Abstract

The utility model relates to a photovoltaic module, the photovoltaic module comprises a bus bar and two parallel strings, the two parallel strings are spliced along a first direction, and each parallel string comprises a first battery string and a second battery string; in the same parallel group string, the first battery strings and the second battery strings are alternately arranged along a second direction; in different parallel group strings, the first battery strings and the second battery strings are arranged in a one-to-one correspondence manner along the first direction; the number of the battery pieces of the first battery string is different from that of the battery pieces of the second battery string, so that the splicing sides of the parallel group strings form insertion finger structures, the insertion finger structures of the two parallel group strings are spliced to form a splicing area, and the bus bar is arranged in the splicing area and extends in the second direction; and the two parallel group strings are connected in parallel through the bus bar. According to the photovoltaic module, more battery pieces can be arranged under the same area, so that the power and the efficiency of the photovoltaic module are improved.

Description

Technical Field

[0001] The present application relates to the field of photovoltaic technology, and in particular to a photovoltaic module. Background Art

[0002] Photovoltaic modules are devices that can convert solar energy into electrical energy. Different types of photovoltaic modules have different numbers of encapsulated cells, and all use a structure in which the whole cell is sliced ​​and then connected in series and then in parallel. In order to ensure that the current and voltage of each parallel string are the same, the number of cells in each string needs to be the same.

[0003] However, the current cell arrangement structure of photovoltaic modules is limited by the layout area. Within a certain layout area, it is difficult to improve the power and efficiency of photovoltaic modules. Utility Model Content

[0004] Based on this, it is necessary to provide a photovoltaic module to solve the problem of how to increase the power and efficiency of the photovoltaic module.

[0005] The present application provides a photovoltaic module, comprising:

[0006] Two parallel strings, the two parallel strings are spliced ​​along a first direction, each of the parallel strings includes a first battery string and a second battery string; in the same parallel string, the first battery string and the second battery string are alternately arranged along the second direction and adjacent first battery strings are connected in series; in different parallel strings, the first battery string and the second battery string are arranged one by one opposite to each other along the first direction; wherein the first direction and the second direction are arranged to intersect; the first battery string and the second battery string each include a plurality of battery cells arranged along the first direction and connected in series, and the number of battery cells in the first battery string is different from the number of battery cells in the second battery string, so that the splicing side of the parallel strings forms a finger structure with a concave and convex shape, the finger structures of the two parallel strings are staggered, and the finger structures of the two parallel strings are spliced ​​to form a splicing area; and,

[0007] A bus bar is provided in the splicing area and extends along the second direction, and the two parallel strings are connected in parallel via the bus bar.

[0008] The technical solution is further described below:

[0009] In one embodiment, the bus bar is located in the middle of the battery cell in the splicing area; or, the bus bar is located at the edge of the battery cell in the splicing area.

[0010] In one embodiment, the bus bar is located on the backlight side of the cell in the splicing area.

[0011] In one embodiment, each of the parallel strings is connected to a plurality of negative electrode welding strips and a plurality of positive electrode welding strips, the negative electrode welding strips and the positive electrode welding strips both extend along the first direction, and the negative electrode welding strips and the positive electrode welding strips are alternately arranged in the second direction;

[0012] The bus bar is connected to all the positive electrode welding strips, and an insulating layer is provided between the bus bar and the negative electrode welding strip; or the bus bar is connected to all the negative electrode welding strips, and an insulating layer is provided between the bus bar and the positive electrode welding strip.

[0013] In one embodiment, the thickness of the insulating layer is 0.001 mm-0.5 mm.

[0014] In one embodiment, the width of the busbar is 2 mm to 30 mm; and / or the thickness of the busbar is 0.05 mm to 2 mm.

[0015] In one embodiment, the photovoltaic assembly further includes a junction box connected to the bus bar.

[0016] In one embodiment, the battery cell is a half-cell cell or a three-cell cell.

[0017] In one embodiment, in the first battery string and / or the second battery string, the distance between two adjacent battery cells is -5 mm to 5 mm.

[0018] In one embodiment, the number of battery cells in the first battery string and the number of battery cells in the second battery string is an odd number, and the number of battery cells in the other battery string is an even number; and / or the number of battery cells in the first battery string differs from the number of battery cells in the second battery string by one cell.

[0019] The photovoltaic module includes two parallel strings spliced ​​along a first direction, each parallel string including a first battery string and a second battery string. In the same parallel string, the first battery string and the second battery string are alternately arranged along the second direction, and the number of battery cells in the first battery string is different from the number of battery cells in the second battery string. In this way, a finger structure with a concave and convex shape is formed on the splicing side of the parallel strings. In addition, because the first battery string and the second battery string are arranged one by one relative to each other along the first direction in different parallel strings, the finger structures of the two parallel strings are staggered. When the two parallel strings are spliced ​​together, the two finger structures can be tightly spliced ​​to form a splicing area. In this way, the busbar can be directly placed in the splicing area to simultaneously connect to the positive electrode welding strips or negative electrode welding strips of the two parallel strings, thereby achieving parallel connection of the two parallel strings. Compared to traditional photovoltaic modules that require a gap to be reserved between two parallel strings for busbar installation, the photovoltaic module of the present application sets the busbar directly in the splicing area of ​​the two parallel strings and does not affect the busbar parallel connection of the two parallel strings. In this way, there is no need to reserve space for the installation of the busbar, so that under the same area, the photovoltaic module of the present application can arrange more battery cells, thereby improving the power and efficiency of the photovoltaic module. At the same time, since in different parallel strings, the first battery string and the second battery string are arranged one by one relative to each other along the first direction, that is, the number of first battery strings in the two parallel strings is the same, and the number of second battery strings is also the same. Therefore, the total number of battery cells in each of the two parallel strings is also the same, thereby ensuring the consistency of the current and voltage of the two parallel strings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings that constitute a part of this application are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0022] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements are drawn only for illustrative purposes and are not necessarily drawn to true scale.

[0023] Figure 1 Schematic diagram of the structure of a photovoltaic module according to an embodiment.

[0024] Figure 2 for Figure 1 The exploded diagram of the photovoltaic module shown in .

[0025] Figure 3 FIG. 4 is a circuit diagram of a photovoltaic module according to an embodiment.

[0026] Figure 4 This is a partial enlarged view of the splicing area of ​​a photovoltaic module according to one embodiment.

[0027] Description of reference numerals:

[0028] 10. Parallel string; 101. Splicing area; 11. First battery string; 12. Second battery string; 13. Finger structure; 141. Positive electrode welding ribbon; 142. Negative electrode welding ribbon; 20. Bus bar; 21. Insulation layer; 30. Junction box. DETAILED DESCRIPTION

[0029] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0030] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0031] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0032] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0035] An embodiment of the present application provides a photovoltaic module, specifically, see Figures 1 to 3 A photovoltaic module of one embodiment includes two parallel strings 10 and a bus bar 20. The two parallel strings 10 are spliced ​​along a first direction, and each parallel string 10 includes a first battery string 11 and a second battery string 12. In the same parallel string 10, the first battery strings 11 and the second battery strings 12 are alternately arranged along the second direction, and adjacent first battery strings 11 and second battery strings 12 are connected in series. In different parallel strings 10, the first battery strings 11 and the second battery strings 12 are arranged one by one opposite to each other along the first direction.

[0036] Wherein, the first direction and the second direction are intersected. For example, the first direction is perpendicular to the second direction. For example, the first direction is Figure 1 The X direction shown in is the length direction of the photovoltaic module. The second direction is Figure 1The Y direction shown in is the width direction of the photovoltaic module.

[0037] Furthermore, the first battery string 11 and the second battery string 12 both include a plurality of battery cells arranged along a first direction and connected in series, and the number of battery cells in the first battery string 11 is different from the number of battery cells in the second battery string 12, so that the splicing side of the parallel string 10 forms a finger structure 13 with a concave and convex shape, and the finger structures 13 of the two parallel strings 10 are staggered, and the finger structures 13 of the two parallel strings 10 are spliced ​​to form a splicing area 101.

[0038] The splicing side value of the parallel string 10 refers to the side of a parallel string 10 that is spliced ​​with another parallel string 10 . Because the number of battery cells in the first battery string 11 is different from the number of battery cells in the second battery string 12, for example, the number of battery cells in the second battery string 12 is one more than the number of battery cells in the first battery string 11, a convexity is formed on the splicing side of the parallel string 10 at the location of the first battery string 11 and a concaveity is formed at the location of the second battery string 12, thereby forming a finger structure 13 with a concave and convex shape on the splicing side of the parallel string 10. Moreover, because the first battery string 11 and the second battery string 12 are arranged one by one opposite to each other along the first direction in different parallel strings 10, that is, the convexity of the finger structure 13 of one parallel string 10 is opposite to the concaveity of the finger structure 13 of the other parallel string 10, the finger structures 13 of the two parallel strings 10 are arranged in an alternating concave and convex manner, that is, the two parallel strings form a left-right asymmetric structure, thereby enabling the finger structures 13 of the two parallel strings 10 to be tightly spliced ​​together to form a splicing area 101 without a gap.

[0039] The busbar 20 is provided in the splicing area 101 and extends along the second direction. The two parallel strings 10 are connected in parallel via the busbar 20. Specifically, the busbar 20 is used to connect the positive electrode welding strips 141 or the negative electrode welding strips 142 of the two parallel strings 10 to collect the current of the two parallel strings 10.

[0040] The above-mentioned photovoltaic module includes two parallel strings 10 spliced ​​along a first direction, and each parallel string 10 includes a first battery string 11 and a second battery string 12; in the same parallel string 10, the first battery string 11 and the second battery string 12 are alternately arranged along the second direction, and the number of battery cells in the first battery string 11 is different from the number of battery cells in the second battery string 12. In this way, a finger structure 13 with a concave and convex shape can be formed on the splicing side of the parallel string 10. Since the first battery string 11 and the second battery string 12 are arranged one by one relative to each other along the first direction in different parallel strings 10, the finger structures 13 of the two parallel strings 10 are staggered. Therefore, when the two parallel strings 10 are spliced, the two finger structures 13 can be tightly spliced ​​to form a splicing area 101. Then, the busbar 20 is directly set in the splicing area 101 so that it can be connected to the positive electrode welding strip 141 or the negative electrode welding strip 142 of the two parallel strings 10 at the same time, thereby realizing the parallel connection of the two parallel strings 10. Compared with the traditional photovoltaic module that requires a gap to be reserved between the two parallel strings 10 for the installation of the busbar 20, the photovoltaic module of the present application sets the busbar 20 directly in the splicing area 101 of the two parallel strings 10 and does not affect the parallel connection of the busbar 20 to the two parallel strings 10. In this way, there is no need to reserve space for the installation of the busbar 20, so that under the same area, the photovoltaic module of the present application can arrange more battery cells, thereby improving the power and efficiency of the photovoltaic module. At the same time, since in different parallel strings 10, the first battery string 11 and the second battery string 12 are arranged one by one relative to each other along the first direction, that is, the number of first battery strings 11 of the two parallel strings 10 is the same, and the number of second battery strings 12 is also the same. Therefore, the total number of battery cells in the two parallel strings 10 is also the same, thereby ensuring the consistency of current and voltage of the two parallel strings 10.

[0041] See also Figure 4 Specifically, optionally, in one embodiment, the bus bar 20 is located in the middle of the battery cell in the splicing area 101. In another embodiment, the bus bar 20 may also be located at the edge of the battery cell in the splicing area 101. For example, the bus bar 20 may also be located at the left edge or right edge of the battery cell in the splicing area 101. As long as it can be connected to the welding ribbon of the battery cell within the battery cell area of ​​the splicing area 101, there is no limitation here.

[0042] Optionally, in one embodiment, the busbar 20 is located on the backlight side of the cell in the splicing area 101. Specifically, in this embodiment, the cell is a back-contact cell, and both the positive and negative electrodes of the back-contact cell are on the backlight side of the cell. By arranging the busbar 20 on the backlight side of the cell, it is relatively easy to weld the busbar 20 to the positive electrode ribbon 141 or the negative electrode on the back side of the cell, and the busbar 20 can be hidden on the backlight side of the photovoltaic module, ensuring the consistency and aesthetics of the appearance of the photovoltaic module, while also preventing the busbar 20 from blocking the light-receiving surface of the photovoltaic module, thereby further improving the power and efficiency of the photovoltaic module.

[0043] See also Figure 4 Each parallel string 10 is connected to multiple negative electrode ribbons 142 and multiple positive electrode ribbons 141. Both the negative electrode ribbons 142 and the positive electrode ribbons 141 extend in a first direction and are alternately arranged in a second direction. Specifically, each battery cell includes a positive electrode region and a negative electrode region located on the back of the cell. The positive electrode regions of each cell are connected in series via the positive electrode ribbons 141, and the negative electrode regions of each cell are connected in series via the negative electrode ribbons 142.

[0044] Optionally, in one embodiment, the busbar 20 is connected to all positive electrode welding ribbons 141, and an insulating layer 21 is provided between the busbar 20 and the negative electrode welding ribbon 142. Alternatively, in another embodiment, the busbar 20 is connected to all negative electrode welding ribbons 142, and an insulating layer 21 is provided between the busbar 20 and the positive electrode welding ribbon 141. This ensures that the busbar 20 connects two parallel strings 10 in parallel while preventing short circuits caused by contact between the busbar 20 and welding ribbons of opposite polarity, thereby improving safety.

[0045] For example, the insulating layer 21 can be an insulating material provided between the busbar 20 and the battery cell, or a composite material laminated on the busbar 20, or an insulating material printed or applied on the battery cell. Optionally, the insulating material can be a film or PET.

[0046] Optionally, the thickness of the insulating layer 21 is 0.001 mm to 0.5 mm. For example, the thickness of the insulating layer 21 is 0.001 mm, 0.005 mm, 0.01 mm, 0.02 mm, 0.035 mm, 0.4 mm, or 0.5 mm. Specifically, if the thickness of the insulating layer 21 is less than 0.001 mm, the insulating layer 21 is easily broken down by the voltage difference between the busbar 20 and the heterogeneous welding ribbon, and fails to provide insulation. If the thickness of the insulating layer 21 is greater than 0.5 mm, the insulating layer 21 is too thick, and the height of the busbar 20 protrudes too high, which can easily lead to poor appearance such as white spots or bubbles after lamination of the photovoltaic module.

[0047] Optionally, in one embodiment, the busbar 20 has a width of 2 mm to 30 mm; for example, the busbar 20 has a width of 2 mm, 5 mm, 8 mm, 10 mm, 15 mm, 20 mm, 25 mm, or 30 mm. Specifically, if the busbar 20 is less than 2 mm wide, the busbar 20 has insufficient current carrying capacity and is weak, making it prone to breakage. If the busbar 20 is greater than 30 mm wide, the cost of the busbar 20 is too high.

[0048] Optionally, in one embodiment, the busbar 20 has a thickness of 0.05 mm to 2 mm. For example, the busbar 20 has a thickness of 0.05 mm, 0.08 mm, 0.1 mm, 0.15 mm, or 0.2 mm. If the busbar 20 is less than 0.05 mm thick, the busbar 20 has insufficient current carrying capacity and insufficient strength, making it prone to breakage. If the busbar 20 is thicker than 2 mm, the protrusion height of the busbar 20 is too high, which can easily lead to poor appearance such as white spots or bubbles after lamination of the photovoltaic module, and increase costs.

[0049] See also Figure 3 In one embodiment, the photovoltaic module further includes a junction box 30, which is connected to the busbar 20. Specifically, a junction box 30 is provided between each adjacent first cell string 11 and second cell string 12 in the parallel module. The junction box 30 simultaneously connects the adjacent first cell strings 11 and second cell strings 12 in the two parallel modules. That is, each junction box 30 connects two first cell strings 11 and two second cell strings 12 in total. The junction box 30 is used to connect the positive and negative poles of the photovoltaic module and output the photovoltaic module power. The junction box 30 also provides bypass protection for the module. When a hot spot occurs in the photovoltaic module, it can short-circuit the problem area to ensure power generation performance.

[0050] Optionally, the cells in the first cell string 11 and the second cell string 12 can be half-cell cells or three-cell cells. Specifically, a whole cell cell can be split in half to form a half-cell cell, and a whole cell cell can be split in half to form a three-cell cell. Whether half-cell cells or three-cell cells, multiple-cut cells can achieve the cell arrangement design of the photovoltaic module of the present application.

[0051] Optionally, in the first battery string 11 and / or the second battery string 12, the spacing between two adjacent battery cells is -5mm to 5mm. For example, the spacing between two adjacent battery cells is -5mm, -3mm, -1mm, 0mm, 1mm, 3mm or 5mm, etc. Among them, when the spacing between two adjacent battery cells is a negative value, it means that the two adjacent battery cells are overlapped, when the spacing between two adjacent battery cells is 0mm, it means that the two adjacent battery cells are closely arranged, and when the spacing between two adjacent battery cells is a positive value, it means that the two adjacent battery cells are arranged with gaps. Therefore, the battery cell arrangement design of the photovoltaic module of the present application is compatible with a variety of battery cell spacings.

[0052] Optionally, in one embodiment, the number of cells in the first battery string 11 and the number of cells in the second battery string 12 are odd, and the number of cells in the other battery string is even. Furthermore, the number of cells in the first battery string 11 and the number of cells in the second battery string 12 differ by one cell.

[0053] For example, Figure 2 As shown, the first battery string 11 includes 11 half-cell batteries, the second battery string 12 includes 12 half-cell batteries, and each parallel string 10 includes 3 first battery strings 11 and 3 first battery strings 11. At this time, the photovoltaic module format is a 69-piece full-cell format.

[0054] Optionally, in other embodiments, the photovoltaic module format can also be a 45-piece full-piece format. In this case, each parallel string 10 includes 3 first battery strings 11 and 3 first battery strings 11, each first battery string 11 includes 7 half-cell batteries, and each second battery string 12 includes 8 half-cell batteries.

[0055] The photovoltaic module format can also be a 51-piece full-cell format. In this case, each parallel string 10 includes 3 first battery strings 11 and 3 first battery strings 11, each first battery string 11 includes 8 half-cell batteries, and each second battery string 12 includes 9 half-cell batteries.

[0056] The photovoltaic module format can also be a 57-piece full-cell format. In this case, each parallel string 10 includes 3 first battery strings 11 and 3 first battery strings 11, each first battery string 11 includes 9 half-cell batteries, and each second battery string 12 includes 10 half-cell batteries.

[0057] The photovoltaic module format can also be a 63-piece full-cell format. In this case, each parallel string 10 includes 3 first battery strings 11 and 3 first battery strings 11, each first battery string 11 includes 10 half-cell batteries, and each second battery string 12 includes 11 half-cell batteries.

[0058] The photovoltaic module format can also be a 75-piece full-cell format. In this case, each parallel string 10 includes 3 first battery strings 11 and 3 second battery strings 11. Each first battery string 11 includes 12 half-cell batteries, and each second battery string 12 includes 13 half-cell batteries.

[0059] The photovoltaic module format can also be an 81-piece full-cell format. In this case, each parallel string 10 includes 3 first battery strings 11 and 3 second battery strings 11. Each first battery string 11 includes 13 half-cell batteries, and each second battery string 12 includes 14 half-cell batteries.

[0060] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A photovoltaic module, characterized in that: include: Two parallel strings (10), the two parallel strings (10) are spliced ​​along a first direction, each of the parallel strings (10) includes a first battery string (11) and a second battery string (12); in the same parallel string (10), the first battery string (11) and the second battery string (12) are alternately arranged along the second direction and adjacent first battery strings (11) and second battery strings (12) are connected in series; in different parallel strings (10), the first battery string (11) and the second battery string (12) are arranged one by one opposite to each other along the first direction; wherein the The first direction and the second direction are arranged to intersect; the first battery string (11) and the second battery string (12) both include a plurality of battery cells arranged along the first direction and connected in series, and the number of battery cells in the first battery string (11) is different from the number of battery cells in the second battery string (12), so that the splicing side of the parallel string (10) forms a finger structure (13) with a concave-convex shape, the finger structures (13) of the two parallel strings (10) are staggered, and the finger structures (13) of the two parallel strings (10) are spliced ​​to form a splicing area (101); and A bus bar (20), the bus bar (20) is arranged in the splicing area (101) and extends along the second direction, and the two parallel strings (10) are connected in parallel via the bus bar (20).

2. The photovoltaic module according to claim 1, characterized in that The bus bar (20) is located in the middle of the battery cell in the splicing area (101); or, the bus bar (20) is located at the edge of the battery cell in the splicing area (101).

3. The photovoltaic module according to claim 1, characterized in that The bus bar (20) is located on the backlight surface of the battery cell in the splicing area (101).

4. The photovoltaic module according to claim 1, characterized in that Each of the parallel strings (10) is connected to a plurality of negative electrode welding strips (142) and a plurality of positive electrode welding strips (141), the negative electrode welding strips (142) and the positive electrode welding strips (141) both extend along a first direction, and the negative electrode welding strips (142) and the positive electrode welding strips (141) are alternately arranged in the second direction; The bus bar (20) is connected to all the positive electrode welding strips (141), and an insulating layer (21) is provided between the bus bar (20) and the negative electrode welding strip (142); or the bus bar (20) is connected to all the negative electrode welding strips (142), and an insulating layer (21) is provided between the bus bar (20) and the positive electrode welding strip (141).

5. The photovoltaic module according to claim 4, characterized in that: The thickness of the insulating layer (21) is 0.001 mm-0.5 mm.

6. The photovoltaic module according to claim 1, characterized in that The width of the busbar (20) is 2 mm to 30 mm; and / or the thickness of the busbar (20) is 0.05 mm to 2 mm.

7. The photovoltaic module according to claim 1, characterized in that The photovoltaic assembly further comprises a junction box (30), and the junction box (30) is connected to the bus bar (20).

8. The photovoltaic module according to claim 1, characterized in that The battery cell is a half-cell cell or a three-cell cell.

9. The photovoltaic module according to claim 1, characterized in that: In the first battery string (11) and / or the second battery string (12), the distance between two adjacent battery cells is -5 mm to 5 mm.

10. The photovoltaic module according to any one of claims 1 to 9, characterized in that: In the first battery string (11) and the second battery string (12), the number of battery cells in one is an odd number, and the number of battery cells in the other is an even number; and / or the number of battery cells in the first battery string (11) differs from the number of battery cells in the second battery string (12) by one cell.

Images