Battery string, photovoltaic module and photovoltaic power generation system

Abstract

The utility model discloses a battery string, a photovoltaic assembly and a photovoltaic power generation system, the battery string comprises a plurality of battery pieces, at least one side surface of each battery piece is provided with a plurality of grid lines, the plurality of grid lines are arranged at intervals along a first direction, the grid lines extend along a second direction, and the second direction is perpendicular to the first direction; the solar cell module comprises a plurality of cell pieces, a plurality of interconnection structural members, two adjacent cell pieces are electrically connected through the plurality of interconnection structural members, the maximum width of the interconnection structural members is D, and D is larger than or equal to 0.16 mm and smaller than or equal to 0.26 mm. According to the battery string provided by the utility model, the production cost of the battery string is reduced, and meanwhile, subfissure or cracking of the battery pieces or the interconnection structural members is not easy to occur.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a battery string, a photovoltaic component and a photovoltaic power generation system. Background Art

[0002] In the current photovoltaic technology, solar cells generally use size specifications of 182mm*182mm, 182mm*210mm and 210mm*210mm. In order to improve the efficiency of photovoltaic modules during the design of photovoltaic module products, a small cell spacing or negative cell spacing design can be adopted.

[0003] In the related art, during the preparation of battery strings, since the contact points between the solder ribbon metal and the battery cells are in hard contact, the contact points are prone to hidden cracks or even splits, or V-shaped hidden cracks are prone to occur after the solder ribbon and the battery cells are laminated. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a battery string that reduces the production cost of the battery string and is less likely to cause hidden cracks or splits in the battery cells or interconnecting structural components.

[0005] Another object of the present invention is to provide a photovoltaic module using the above-mentioned battery string.

[0006] Another object of the present invention is to provide a photovoltaic power generation system using the above-mentioned battery string or photovoltaic module.

[0007] According to the embodiment of the first aspect of the present invention, the battery string includes: a plurality of battery cells, a plurality of grid lines are provided on at least one side surface of the battery cells, the plurality of grid lines are arranged at intervals along a first direction, the grid lines extend along a second direction, and the second direction is perpendicular to the first direction; a plurality of interconnecting structural members, two adjacent battery cells are electrically connected by the plurality of interconnecting structural members, and the maximum width of the interconnecting structural members is D, wherein D satisfies: 0.16mm≤D≤0.26mm.

[0008] According to the battery string of the present invention, considering the production cost of the battery string and the difficulty of connecting the interconnecting structural members to the battery cells, setting the maximum width D of the interconnecting structural members to 0.16mm≤D≤0.26mm is a reasonable setting, which reduces the difficulty of connecting the interconnecting structural members to the battery cells and improves the production efficiency of the battery string. Moreover, the flexibility of the interconnecting structural members is improved, avoiding hidden cracks or splits in the battery cells or the interconnecting structural members during the production of the battery string, thereby improving the reliability of the battery string and extending the service life of the battery string. Furthermore, the material consumption of the interconnecting structural members is reduced, reducing the production cost of the interconnecting structural members, thereby reducing the production cost of the battery string.

[0009] According to some embodiments of the present invention, the interconnection structure extends along the second direction, multiple interconnection structures are respectively connected to multiple gate lines one by one, multiple interconnection structures are arranged at intervals along the first direction, and the second direction is the extension direction of the battery string.

[0010] According to some embodiments of the present invention, the length of the battery cell is L1, and the width of the battery cell is W1, wherein L1 and W1 respectively satisfy: 182mm≤L1≤210mm, 182mm≤n*W1≤210mm, when n=2, the diameter of the interconnection structure connected to each of the battery cells is D1, wherein D1 satisfies: 0.16mm≤D1≤0.26mm; when n=3, the diameter of the interconnection structure connected to each of the battery cells is D2, wherein D2 satisfies: 0.20mm≤D2≤0.26mm. According to some embodiments of the present invention, the plurality of battery cells include a first battery cell, the length of the first battery cell is 182 mm, the width of the first battery cell is 91 mm, the number of the interconnecting structural members connected to each of the first battery cells is N1, and when N1=16, the diameter of the interconnecting structural member is d1, wherein d1 satisfies: 0.20 mm ≤ d1 ≤ 0.26 mm; when N1=18, the diameter of the interconnecting structural member is d2, wherein d2 satisfies: 0.18 mm ≤ d2 ≤ 0.24 mm; when N1=20, the diameter of the interconnecting structural member is d3, wherein d3 satisfies: 0.16 mm ≤ d3 ≤ 0.22 mm.

[0011] According to some embodiments of the present invention, the plurality of battery cells include a second battery cell, the length of the second battery cell is 182 mm, the width of the second battery cell is 105 mm, the number of the interconnecting structural members connected to each second battery cell is N2, and when N2=16, the diameter of the interconnecting structural member is d4, wherein d4 satisfies: 0.20 mm ≤ d4 ≤ 0.26 mm; when N2=18, the diameter of the interconnecting structural member is d5, wherein d5 satisfies: 0.18 mm ≤ d5 ≤ 0.24 mm; when N2=20, the diameter of the interconnecting structural member is d6, wherein d6 satisfies: 0.16 mm ≤ d6 ≤ 0.22 mm.

[0012] According to some embodiments of the present invention, the plurality of battery cells include a third battery cell, the length of the third battery cell is 182 mm, the width of the third battery cell is 70 mm, the number of the interconnecting structural members connected to each of the third battery cells is N3, and when N3=12, the diameter of the interconnecting structural member is d7, wherein d7 satisfies: 0.22 mm ≤ d7 ≤ 0.26 mm; when N3=14, the diameter of the interconnecting structural member is d8, wherein d8 satisfies: 0.20 mm ≤ d8 ≤ 0.24 mm.

[0013] According to some embodiments of the present invention, the plurality of battery cells include a fourth battery cell, the length of the fourth battery cell is 210 mm, the width of the fourth battery cell is 105 mm, and the number of the interconnecting structural members connected to each of the fourth battery cells is N4. When N4=18, the diameter of the interconnecting structural member is d9, wherein d9 satisfies: 0.20 mm ≤ d9 ≤ 0.26 mm; when N4=20, the diameter of the interconnecting structural member is d 10 , wherein the d 10 Satisfies: 0.18mm≤d10≤0.24mm; when N4=22, the diameter of the interconnected structural member is d 11 , wherein the d 11 Satisfy: 0.16mm≤d 11 ≤0.22mm; when N4=24, the diameter of the interconnecting structure is d 12 , wherein the d 12 Satisfy: 0.16mm≤d 12 ≤0.20mm.

[0014] According to some embodiments of the present invention, the plurality of battery cells include a fifth battery cell, the length of the fifth battery cell is L2, the width of the fifth battery cell is W2, wherein L2 and W2 respectively satisfy: L2 / W2=2, L2>210mm, the number of the interconnecting structural members connected to each of the fifth battery cells is N6, when N5=18, the diameter of the interconnecting structural member is d 13 , wherein the d 13 Satisfy: 0.20mmmm≤d 13 ≤0.26mm; when N5=20, the diameter of the interconnecting structure is d 14 , wherein the d 14 Satisfy: 0.18mm≤d 14 ≤0.24mm.

[0015] According to some embodiments of the present invention, the cross-section of the interconnecting structural member is circular.

[0016] The photovoltaic assembly according to the embodiment of the second aspect of the present invention includes the battery assembly according to the embodiment of the first aspect of the present invention.

[0017] The photovoltaic power generation system according to the third embodiment of the present invention includes the battery assembly according to the first embodiment of the present invention, or the photovoltaic assembly according to the second embodiment of the present invention.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 Schematic diagram of a battery string according to an embodiment of the present invention, wherein the length of the battery cell is 182 mm and the number of grid lines is 16;

[0021] Figure 2 Schematic diagram of a battery string according to an embodiment of the present invention, wherein the length of the battery cell is 182 mm and the number of grid lines is 18;

[0022] Figure 3 Schematic diagram of a battery string according to an embodiment of the present invention, wherein the length of the battery cell is 182 mm and the number of grid lines is 20;

[0023] Figure 4 1 is a schematic diagram of a battery string according to an embodiment of the present invention, wherein the length of the battery cell is 210 mm and the number of grid lines is 18;

[0024] Figure 5 Schematic diagram of a battery string according to an embodiment of the present invention, wherein the length of the battery cell is 210 mm and the number of grid lines is 20;

[0025] Figure 6 is a schematic diagram showing the relationship between the diameter of the interconnection structure of the first battery cell of a battery string and the cost of the battery string according to an embodiment of the present utility model;

[0026] Figure 7 is a schematic diagram showing the relationship between the diameter of the interconnection structure of the second battery sheet of a battery string and the cost of the battery string according to an embodiment of the present utility model;

[0027] Figure 8 2. It is a schematic diagram showing the relationship between the diameter of the interconnection structure of the third battery cell of the battery string and the cost of the battery string according to an embodiment of the present invention;

[0028] Figure 9 Schematic diagram of the relationship between the diameter of the interconnection structure of the fourth battery cell of the battery string and the cost of the battery string according to an embodiment of the present invention.

[0029] Reference numerals:

[0030] 100. Battery string;

[0031] 1. Battery cells; 2. Interconnecting structural parts. DETAILED DESCRIPTION

[0032] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figures 1-9 A battery string 100 according to an embodiment of the first aspect of the present invention is described.

[0033] like Figure 1 As shown, a battery string 100 according to an embodiment of the first aspect of the present invention comprises a plurality of battery cells 1 and a plurality of interconnecting structural members 2. In the description of the present invention, "plurality" means two or more.

[0034] Specifically, a plurality of grid lines (not shown) are provided on at least one surface of a cell 1. The grid lines are spaced apart along a first direction and extend along a second direction perpendicular to the first direction. Adjacent cell 1 cells are electrically connected via a plurality of interconnecting structures 2. The maximum width of the interconnecting structures 2 is D, where D satisfies the following: 0.16 mm ≤ D ≤ 0.26 mm.

[0035] For example, the interconnection structure 2 can collect currents on multiple grid lines. When the maximum width D of the interconnection structure 2 is less than 0.16 mm, the maximum width of the interconnection structure 2 is small, thereby increasing the difficulty of connecting the interconnection structure 2 with the battery cell 1 and reducing the production efficiency of the battery string 100. When the maximum width D of the interconnection structure 2 is greater than 0.26 mm, the maximum width of the interconnection structure 2 is large, which reduces the flexibility of the interconnection structure 2. During the production process of the battery string 100, the contact points between the interconnection structure 2 and the battery cell 1 are hard contacts, and it is easy to produce hidden cracks or even splits at the contact points. In addition, the shear force is large during the lamination process of the interconnection structure 2 and the battery cell 1, resulting in V-shaped hidden cracks, which reduces the service life of the battery cell 1 or the interconnection structure 2. In addition, the material usage of the interconnection structure 2 is increased, the production cost of the interconnection structure 2 is increased, and thus the production cost of the battery string 100 is increased.

[0036] Therefore, by setting the maximum width D of the interconnecting structural member 2 to satisfy 0.16mm≤D≤0.26mm, the width of the interconnecting structural member 2 is reasonably set, which reduces the difficulty of connecting the interconnecting structural member 2 with the battery cell 1, thereby improving the production efficiency of the battery string 100. In addition, the flexibility of the interconnecting structural member 2 is improved, and during the production process of the battery string 100, the occurrence of hidden cracks or splits at the contact points between the interconnecting structural member 2 and the battery cell 1 is avoided, and the shear force of the interconnecting structural member 2 and the battery cell 1 during the lamination process is also reduced, avoiding the occurrence of V-shaped hidden cracks, thereby effectively avoiding damage to the battery cell 1 or the interconnecting structural member 2. The battery cell 1 or the interconnecting structural member 2 can be used normally for a long time, improving the reliability of the battery string 100 and extending the service life of the battery string 100. In addition, the material usage of the interconnecting structural member 2 is reduced, the production cost of the interconnecting structural member 2 is reduced, and thus the production cost of the battery cell 1 is reduced. It should be noted that the interconnecting structural member 2 is a welding strip and the grid line is the main grid line. Among them, the battery cell 1 can be a battery cell 1 with a busbar or a battery cell 1 without a busbar. In this application, the battery cell 1 with a busbar is used as an example for detailed description. In the battery string 100, the same interconnecting structure 2 can be located on the surface of the same side of two adjacent battery cells 1, or the two ends of the same interconnecting structure 2 can be located on the surfaces of different sides of two adjacent battery cells 1. However, this is not limited to this. The configuration of the battery string 100 can be specifically configured according to actual usage.

[0037] According to the battery string 100 of the present invention, considering the production cost of the battery string 100 and the difficulty of connecting the interconnecting structural member 2 to the battery cell 1, setting the maximum width D of the interconnecting structural member 2 to 0.16mm≤D≤0.26mm is a reasonable setting, which reduces the difficulty of connecting the interconnecting structural member 2 to the battery cell 1 and improves the production efficiency of the battery string 100. Furthermore, the flexibility of the interconnecting structural member 2 is improved, preventing hidden cracks or splits in the battery cell 1 or the interconnecting structural member 2 during the production of the battery string 100, thereby improving the reliability of the battery string 100 and extending its service life. Furthermore, the material usage of the interconnecting structural member 2 is reduced, reducing the production cost of the interconnecting structural member 2, thereby reducing the production cost of the battery string 100.

[0038] According to some embodiments of the present invention, the interconnection structure 2 extends along the second direction, multiple interconnection structures 2 are respectively connected to multiple grid lines one by one, and multiple interconnection structures 2 are arranged at intervals along the first direction. The second direction is the extension direction of the battery string 100.

[0039] For example, the battery string 100 has a plurality of battery cells 1 arranged at intervals along the second direction, the interconnecting structural member 2 and the grid lines both extend along the second direction, and the interconnecting structural member 2 is connected to the grid lines on the two adjacent battery cells 1 along the second direction, that is, the number of interconnecting structural members 2 is the same as the number of grid lines. In this arrangement, after the grid lines collect the current on the battery cells 1, they can be converged through the interconnecting structural member 2 so as to use the current on the battery cells 1, thereby improving the performance of the battery string 100. In addition, the battery string 100 has a simple structure and is easy to produce, thereby improving the production efficiency of the battery string 100. Among them, the interconnecting structural member 2 and the corresponding grid lines are also connected by an adhesive film, which further strengthens the connection strength between the interconnecting structural member 2 and the grid lines and improves the stability of the interconnecting structural member 2. When the maximum width of the interconnecting structural member 2 is small, the power of the battery string 100 is reduced, the thickness of the adhesive film is reduced, and the production cost of the interconnecting structural member 2 and the adhesive film is reduced.

[0040] According to some embodiments of the present invention, the length of the battery cell 1 is L1, and the width of the battery cell 1 is W1, wherein L1 and W1 respectively satisfy: 182mm≤L1≤210mm, 182mm≤n*W1≤210mm, when n=2, the diameter of the interconnection structure 2 connected to each battery cell 1 is D1, wherein D1 satisfies: 0.16mm≤D1≤0.26mm; when n=3, the diameter of the interconnection structure 2 connected to each battery cell 1 is D2, wherein D2 satisfies: 0.20mm≤D2≤0.26mm.

[0041] For example, when n is 2, the battery cell 1 (i.e., the length L 1， width W1) is a half-piece of the cell 1 with a length of L1 and a width of 2W1. When n is 3, the cell 1 (i.e., the length L 1， The width is W1) is a three-part slice of the battery cell 1 with a length of L1 and a width of 3W1 respectively.

[0042] In this way, the size of the battery cell 1 and the diameter of the interconnecting structure 2 on the corresponding battery cell 1 are set, which makes it easy to select battery cells 1 of different sizes according to actual usage, thereby improving the flexibility of the battery string 100. It also improves the flexibility of the interconnecting structure 2 and facilitates use. Moreover, it also reduces the production cost of the interconnecting structure 2, thereby reducing the production cost of the battery string 100. Among them, the above-mentioned battery cell 1 includes a two-piece battery cell 1 with a length and width of 182 mm (such as the first battery cell), a two-piece battery cell 1 with a length and width of 182 mm and 210 mm (such as the second battery cell) and a three-piece battery cell 1 (such as the third battery cell), and a two-piece battery cell 1 with a length and width of 210 mm and 210 mm (such as the fourth battery cell). But it is not limited to this.

[0043] According to some embodiments of the present invention, the plurality of battery cells 1 include a first battery cell, the length of the first battery cell is 182 mm, the width of the first battery cell is 91 mm, the number of interconnected structural members 2 adjacent to each first battery cell is N1, and when N1=16, the diameter of the interconnected structural member 2 is d1, wherein d1 satisfies: 0.20 mm ≤ d1 ≤ 0.26 mm; when N1=18, the diameter of the interconnected structural member 2 is d2, wherein d2 satisfies: 0.18 mm ≤ d2 ≤ 0.24 mm; when N1=20, the diameter of the interconnected structural member 2 is d3, wherein d3 satisfies: 0.16 mm ≤ d3 ≤ 0.22 mm.

[0044] like Figure 6 As shown in the figure, the horizontal axis represents the diameter of the interconnecting structure 2, and the vertical axis represents the cost of the battery string 100. That is, when the length of the first battery cell is 182 mm and the width of the first battery cell is 91 mm (that is, the first battery cell is a two-piece battery cell 1 with a length and width of 182 mm respectively), the cost of the battery string 100 is calculated for different values ​​of the diameter of the interconnecting structure 2 on the first battery cell. As the diameter of the interconnecting structure 2 gradually increases, the cost of the battery string 100 gradually increases.

[0045] Combine Figure 6 The difficulty of processing the battery string 100 is such that when the number of grid lines on the first battery cell is 16 (e.g. Figure 1 When the first cell is connected to a plurality of interconnecting structures 100, the number of grid lines on the first cell is small, the distance between adjacent grid lines is large, and the diameter d1 of the interconnecting structure 2 is set to 0.20 mm ≤ d1 ≤ 0.26 mm. This is a reasonable setting, which increases the diameter of the interconnecting structure 2, thereby reducing the difficulty of connecting the interconnecting structure 2 to the cell 1. Furthermore, the number of interconnecting structures 2 is reduced, and the material consumption of the interconnecting structure 2 and the adhesive film is reduced, thereby reducing the production cost of the battery string 100.

[0046] When the number of gate lines on the first cell is 18 (e.g. Figure 2 (as shown), the number of gridlines on the first cell is moderate, the distance between adjacent gridlines is moderate, and the diameter d2 of the interconnection structure 2 is 0.18 mm ≤ d2 ≤ 0.24 mm. The reasonable setting of the diameter of the interconnection structure 2 reduces the difficulty of connecting the interconnection structure 2 to the cell 1. On the other hand, it improves the flexibility of the interconnection structure, facilitating its use, and reduces the production cost of the interconnection structure 2 and the adhesive film, thereby reducing the production cost of the battery string 100.

[0047] When the number of gate lines on the first cell is 20 (e.g. Figure 3When the number of grid lines on the first cell is large and the distance between adjacent grid lines is small, the diameter d3 of the interconnection structure 2 is 0.16 mm ≤ d3 ≤ 0.22 mm. This reasonable arrangement reduces the diameter of the interconnection structure 2 and increases its flexibility, thereby preventing hidden cracks or breakage of the cell 1 or the interconnection structure 2 during the production of the battery string 100, thereby extending the service life of the battery string 100. Furthermore, the production cost of the interconnection structure 2 is reduced.

[0048] According to some embodiments of the present invention, the plurality of battery cells 1 include a second battery cell, the length of the second battery cell is 182 mm, the width of the second battery cell is 105 mm, and the number of interconnecting structural members 2 connected to each second battery cell is N2. When N2 = 16, the diameter of the interconnecting structural member 2 is d4, where d4 satisfies the following conditions: 0.20 mm ≤ d4 ≤ 0.26 mm. When N2 = 18, the diameter of the interconnecting structural member 2 is d5, where d5 satisfies the following conditions: 0.18 mm ≤ d5 ≤ 0.24 mm. When N2 = 20, the diameter of the interconnecting structural member 2 is d6, where d6 satisfies the following conditions: 0.16 mm ≤ d6 ≤ 0.22 mm.

[0049] For example, Figure 7 As shown in the figure, the horizontal axis represents the diameter of the interconnecting structure 2, and the vertical axis represents the cost of the battery string 100. That is, when the length and width of the second battery cell are 182 mm and 105 mm respectively (that is, the second battery cell is a two-piece battery cell 1 with a length and width of 182 mm and 210 mm respectively), the cost of the battery string 100 is calculated for different values ​​of the diameter of the interconnecting structure 2 on the second battery cell. As the diameter of the interconnecting structure 2 gradually increases, the cost of the battery string 100 gradually increases.

[0050] Combine Figure 7 The difficulty of processing the battery string 100 is such that when the number of grid lines on the second battery cell is 16 (e.g. Figure 1 When the second cell is connected to a plurality of grid lines (as shown in FIG2 ), the number of grid lines on the second cell is small, the distance between adjacent grid lines is large, and the diameter d4 of the interconnection structure 2 is 0.20 mm ≤ d4 ≤ 0.26 mm. This increases the diameter of the interconnection structure 2, thereby reducing the difficulty of connecting the interconnection structure 2 to the cell 1. Furthermore, the number of interconnection structures 2 on the second cell is small, thereby reducing the production cost of the battery string 100.

[0051] When the number of gate lines on the second cell is 18 (e.g. Figure 2When the number of grid lines on the second cell is appropriate, the distance between adjacent grid lines is appropriate, and the diameter d5 of the interconnection structure 2 is 0.18 mm ≤ d5 ≤ 0.24 mm. The diameter of the interconnection structure 2 is reasonably set. On the one hand, it reduces the difficulty of connecting the interconnection structure 2 to the cell 1. On the other hand, it reduces the production cost of the battery string 100 and improves the flexibility of the interconnection structure, making it easier to use.

[0052] When the number of gate lines on the second cell is 20 (e.g. Figure 3 When the number of grid lines on the second cell is large and the distance between adjacent grid lines is small, the diameter d6 of the interconnection structure 2 is 0.16 mm ≤ d6 ≤ 0.22 mm. This reduces the diameter of the interconnection structure 2 and increases its flexibility, thus preventing hidden cracks or breakage in the cell 1 or the interconnection structure 2 during the production of the battery string 100, thereby extending the service life of the battery string 100. Furthermore, the production cost of the interconnection structure 2 is reduced, thereby reducing the production cost of the battery string 100.

[0053] According to some embodiments of the present invention, the plurality of battery cells include a third battery cell, the length of the third battery cell is 182 mm, the width of the third battery cell is 70 mm, the number of interconnection structural members 2 connected to each third battery cell is N3, when N3=12, the diameter of the interconnection structural member 2 is d7, wherein d7 satisfies: 0.22 mm ≤ d7 ≤ 0.26 mm; when N3=14, the diameter of the interconnection structural member 2 is d8, wherein d8 satisfies: 0.20 mm ≤ d8 ≤ 0.24 mm.

[0054] For example, Figure 8 As shown in the figure, the horizontal axis represents the diameter of the interconnection structure 2, and the vertical axis represents the cost of the battery string 100. That is, when the length and width of the third battery cell are 182 mm and 70 mm respectively (i.e., the third battery cell is a three-piece battery cell 1 with a length and width of 182 mm and 210 mm respectively), the cost of the interconnection structure 2 and the adhesive film on the third battery cell is calculated under different values ​​of the diameter of the interconnection structure 2. As the diameter of the interconnection structure 2 gradually increases, the cost of the interconnection structure 2 and the adhesive film gradually increases.

[0055] Combine Figure 8 Compared with the processing difficulty of the battery string 100, when the number of grid lines on the third battery cell is 12, the number of grid lines on the third battery cell is small, the distance between adjacent grid lines is large, and the diameter d7 of the interconnection structure 2 is 0.22mm≤d7≤0.26mm, which increases the diameter of the interconnection structure 2, thereby reducing the difficulty of connecting the interconnection structure 2 with the battery cell 1 and improving the production efficiency of the battery string 100.

[0056] When the number of grid lines on the third cell is 14, the number of grid lines on the third cell is large, the distance between adjacent grid lines is small, and the diameter d8 of the interconnection structure 2 is 0.20 mm ≤ d8 ≤ 0.24 mm. This reduces the diameter of the interconnection structure 2 and increases its flexibility, preventing hidden cracks or breakage in the cell 1 or the interconnection structure 2 during the production of the battery string 100, thereby extending the service life of the cell 1. Furthermore, the production cost of the interconnection structure 2 is reduced, thereby reducing the production cost of the battery string 100.

[0057] According to some embodiments of the present invention, the plurality of battery cells 1 include a fourth battery cell, the length of the fourth battery cell is 210 mm, the width of the fourth battery cell is 105 mm, and the number of interconnecting structural members 2 connected to each fourth battery cell is N4. When N4=18, the diameter of the interconnecting structural member 2 is d9, where d9 satisfies: 0.20 mm ≤ d9 ≤ 0.26 mm; when N4=20, the diameter of the interconnecting structural member 2 is d 10 , where d 10 Satisfies: 0.18mm≤d10≤0.24mm; when N4=22, the diameter of the interconnecting structure 2 is d 11 , where d 11 Satisfy: 0.16mm≤d 11 ≤0.22mm; when N4=24, the diameter of the interconnecting structure 2 is d 12 , where d 12 Satisfy: 0.16mm≤d 12 ≤0.20mm.

[0058] like Figure 9 As shown in the figure, the horizontal axis represents the diameter of the interconnection structure 2, and the vertical axis represents the cost of the battery string 100. That is, when the length and width of the fourth battery cell are 210 mm and 105 mm respectively (that is, the fourth battery cell is a two-piece battery cell 1 with a length and width of 210 mm respectively), the cost of the interconnection structure 2 and the adhesive film on the fourth battery cell is calculated under different values ​​of the diameter of the interconnection structure 2. As the diameter of the interconnection structure 2 gradually increases, the cost of the interconnection structure 2 and the adhesive film gradually increases.

[0059] Combine Figure 9 Compared with the processing difficulty of the battery string 100, when the number of grid lines on the fourth battery cell is 18 (such as Figure 4When the fourth cell is connected to a plurality of interconnecting structures 2 (as shown in FIG2 ), the number of grid lines on the fourth cell is relatively small, the distance between adjacent grid lines is relatively large, and the diameter d9 of the interconnecting structure 2 is 0.20 mm ≤ d9 ≤ 0.26 mm. This increases the diameter of the interconnecting structure 2, thereby reducing the difficulty of connecting the interconnecting structure 2 to the cell 1. Furthermore, the number of interconnecting structures 2 on the fourth cell is relatively small, thereby reducing the production cost of the interconnecting structure 2 and the adhesive film, and thus reducing the production cost of the battery string 100.

[0060] When the number of grid lines on the fourth cell is 20 (e.g. Figure 5 As shown), the number of grid lines on the fourth cell is increased, the distance between adjacent grid lines is reduced, and the diameter d of the interconnection structure 2 is 10 0.18mm≤d 10 The diameter of the interconnecting structure 2 is ≤0.24 mm. This is a reasonable setting. On the one hand, it reduces the difficulty of connecting the interconnecting structure 2 to the battery cell 1. On the other hand, it reduces the production cost of the interconnecting structure 2 and the adhesive film, reduces the production cost of the battery string 100, and improves the flexibility of the interconnecting structure, making it easier to use.

[0061] When the number of grid lines on the fourth cell is 22, the number of grid lines on the fourth cell is increased, the distance between adjacent grid lines is reduced, and the diameter d of the interconnection structure 2 is 11 0.16mm≤d 11 The diameter of the interconnecting structure 2 is ≤0.22 mm. This is a reasonable setting. On the one hand, it reduces the difficulty of connecting the interconnecting structure 2 to the battery cell 1. On the other hand, it reduces the production cost of the interconnecting structure 2 and the adhesive film, reduces the production cost of the battery string 100, and improves the flexibility of the interconnecting structure, making it easier to use.

[0062] When the number of grid lines on the fourth cell is 24, the number of grid lines on the fourth cell is large, the distance between adjacent grid lines is small, and the diameter d of the interconnection structure 2 is 12 0.16mm≤d 12 ≤0.20 mm, reducing the diameter of the interconnecting structural member 2 and increasing its flexibility, thereby preventing hidden cracks or breakage in the battery cells 1 or the interconnecting structural member 2 during the production of the battery string 100, thereby extending the service life of the battery string 100. Furthermore, the production cost of the interconnecting structural member 2 is reduced, thereby reducing the production cost of the battery string 100.

[0063] According to some embodiments of the present invention, the plurality of battery cells 1 include a fifth battery cell, the length of the fifth battery cell is L2, the width of the fifth battery cell is W2, wherein L2 and W2 satisfy: L2 / W2=2, L2>210mm, the number of interconnecting structural members 2 connected to each fifth battery cell is N5, when N5=18, the diameter of the interconnecting structural member 2 is d 13, where d 13 Satisfy: 0.20mm≤d 13 ≤0.26mm; when N5=20, the diameter of the interconnecting structure 2 is d 14 , where d 14 Satisfy: 0.18mm≤d 14 ≤0.24mm.

[0064] For example, when the length and width of the fifth cell are L2 and W2 respectively, the fifth cell is a two-piece cell whose length and width are L2 respectively.

[0065] Considering the difficulty of processing the battery string 100, when the number of grid lines on the fifth battery cell is 18, the number of grid lines on the fifth battery cell is small, the distance between adjacent grid lines is large, and the diameter d of the interconnection structure 2 is large. 13 0.20mm≤d 13 ≤0.26 mm, which increases the diameter of the interconnection structure 2, thereby reducing the difficulty of connecting the interconnection structure 2 to the battery cell 1. Moreover, the number of interconnection structures 2 on the fifth battery cell is relatively small, thereby reducing the production cost of the interconnection structure 2 and the adhesive film, and reducing the production cost of the battery string 100.

[0066] When the number of grid lines on the fifth cell is 20, the number of grid lines on the fifth cell is large, the distance between adjacent grid lines is small, and the diameter d of the interconnection structure 2 is 14 0.18mm≤d 14 ≤0.24 mm, reducing the diameter of the interconnection structure 2 and increasing its flexibility, thus preventing hidden cracks or breakage in the battery cells 1 or the interconnection structure 2 during the production of the battery string 100, thereby extending the service life of the battery string 100. Furthermore, the production cost of the interconnection structure 2 is reduced, thereby reducing the production cost of the battery string 100.

[0067] According to some embodiments of the present invention, the cross-section of the interconnection structure 2 is circular. This configuration simplifies the structure of the interconnection structure 2, improves the production efficiency of the interconnection structure 2, and facilitates mass production.

[0068] A photovoltaic assembly (not shown) according to an embodiment of the second aspect of the present invention includes a battery string 100 according to the embodiment of the first aspect of the present invention.

[0069] According to the photovoltaic assembly of the present invention, the production cost of the photovoltaic assembly is reduced by adopting the above-mentioned battery string 100.

[0070] A photovoltaic power generation system (not shown) according to an embodiment of the third aspect of the present invention includes a battery string 100 according to an embodiment of the first aspect of the present invention, or a photovoltaic module according to an embodiment of the second aspect of the present invention.

[0071] According to the photovoltaic power generation system of the present invention, the production cost of the photovoltaic power generation system is reduced by adopting the above-mentioned battery string 100 or photovoltaic module.

[0072] Other structures and operations of the battery string 100, photovoltaic assembly or photovoltaic power generation system according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0073] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "diameter", "thickness", "up", "down", "front", "back", "left", "right", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 the present invention.

[0074] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0075] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery string, characterized in that: include: A plurality of battery cells, wherein a plurality of grid lines are provided on at least one side surface of the battery cell, the plurality of grid lines are arranged at intervals along a first direction, and the grid lines extend along a second direction, the second direction being perpendicular to the first direction; A plurality of interconnecting structural members, two adjacent battery cells are electrically connected via the plurality of interconnecting structural members, the maximum width of the interconnecting structural members is D, wherein D satisfies: 0.16 mm ≤ D ≤ 0.26 mm.

2. The battery string according to claim 1, characterized in that: The interconnection structure extends along the second direction, a plurality of the interconnection structures are connected to a plurality of the gate lines in a one-to-one correspondence, and the plurality of the interconnection structures are arranged at intervals along the first direction. The second direction is the extension direction of the battery string.

3. The battery string according to claim 2, characterized in that: The length of the battery cell is L1, and the width of the battery cell is W1, wherein L1 and W1 respectively satisfy: 182mm≤L1≤210mm, 182mm≤n*W1≤210mm, When n=2, the diameter of the interconnecting structure connected to each of the battery cells is D1, wherein D1 satisfies: 0.16 mm ≤ D1 ≤ 0.26 mm; When n=3, the diameter of the interconnecting structure connected to each of the battery cells is D2, wherein D2 satisfies: 0.20 mm ≤ D2 ≤ 0.26 mm.

4. The battery string according to claim 3, characterized in that: The plurality of battery cells include a first battery cell, the length of the first battery cell is 182 mm, the width of the first battery cell is 91 mm, the number of the interconnecting structural members connected to each first battery cell is N1, When N1=16, the diameter of the interconnected structural member is d1, wherein d1 satisfies: 0.20 mm≤d1≤0.26 mm; When N1=18, the diameter of the interconnected structural member is d2, wherein d2 satisfies: 0.18 mm ≤ d2 ≤ 0.24 mm; When N1=20, the diameter of the interconnected structural member is d3, wherein d3 satisfies: 0.16 mm≤d3≤0.22 mm.

5. The battery string according to claim 3, characterized in that: The plurality of battery cells include a second battery cell, the length of the second battery cell is 182 mm, the width of the second battery cell is 105 mm, and the number of the interconnecting structural members connected to each second battery cell is N2. When N2=16, the diameter of the interconnected structural member is d4, wherein d4 satisfies: 0.20 mm≤d4≤0.26 mm; When N2=18, the diameter of the interconnected structural member is d5, wherein d5 satisfies: 0.18 mm ≤ d5 ≤ 0.24 mm; When N2=20, the diameter of the interconnected structural member is d6, wherein d6 satisfies: 0.16 mm≤d6≤0.22 mm.

6. The battery string according to claim 3, characterized in that: The plurality of battery cells include a third battery cell, the length of the third battery cell is 182 mm, the width of the third battery cell is 70 mm, and the number of the interconnecting structural members connected to each of the third battery cells is N3. When N3=12, the diameter of the interconnected structural member is d7, wherein d7 satisfies: 0.22 mm≤d7≤0.26 mm; When N3=14, the diameter of the interconnected structural member is d8, wherein d8 satisfies: 0.20 mm≤d8≤0.24 mm.

7. The battery string according to claim 3, characterized in that: The plurality of battery cells include a fourth battery cell, the length of the fourth battery cell is 210 mm, the width of the fourth battery cell is 105 mm, and the number of the interconnecting structural members connected to each of the fourth battery cells is N4. When N4=18, the diameter of the interconnected structural member is d9, wherein d9 satisfies: 0.20 mm≤d9≤0.26 mm; When N4=20, the diameter of the interconnected structure is d 10 , wherein the d 10 Satisfy: 0.18mm≤d10≤0.24mm; When N4=22, the diameter of the interconnected structure is d 11 , wherein the d 11 Satisfy: 0.16mm≤d 11 ≤0.22mm; When N4=24, the diameter of the interconnecting structure is d 12 , wherein the d 12 Satisfy: 0.16mm≤d 12 ≤0.20mm.

8. The battery string according to claim 2, characterized in that: The plurality of battery cells include a fifth battery cell, the length of the fifth battery cell is L2, the width of the fifth battery cell is W2, wherein L2 and W2 satisfy: L2 / W2=2, L2>210mm, and the number of the interconnecting structural members connected to each of the fifth battery cells is N5, When N5=18, the diameter of the interconnecting structure is d 13 , wherein the d 13 Satisfy: 0.20mm≤d 13 ≤0.26mm; When N5=20, the diameter of the interconnected structure is d 14 , wherein the d 14 Satisfy: 0.18mm≤d 14 ≤0.24mm.

9. The battery string according to any one of claims 1 to 8, characterized in that: The cross-section of the interconnecting structure is circular.

10. A photovoltaic module, characterized in that: Comprising the battery string according to claim 9.

11. A photovoltaic power generation system, characterized in that: The method comprises the cell string according to claim 9 or the photovoltaic module according to claim 10.

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