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, a plurality of first interconnection structural members and a plurality of second interconnection structural members, a first grid line comprises a plurality of first grid line segments arranged at intervals along a second direction, and a second grid line comprises a plurality of second grid line segments arranged at intervals along the second direction; the first interconnection structural member is arranged between two adjacent first grid line segments of the plurality of first grid lines, the second interconnection structural member is arranged between two adjacent second grid line segments of the plurality of second grid lines, and a first insulating layer is arranged on the peripheral surface of the part, between the two adjacent first grid line segments, of the first interconnection structural member; and a second insulating layer is arranged on the peripheral surface of the part, between two adjacent second grid line segments, of the second interconnection structural member. According to the battery string provided by the utility model, short circuit is avoided when the first interconnection structural member and the second interconnection structural member deviate, the battery string can be normally used for a long time, and the photovoltaic module can also be normally used for a long time.

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 development of photovoltaic modules, Perc cells, Topcon cells, HJT cells, etc. have been produced one after another. Subsequently, back-contact solar cells (BC cells) were produced. The BC cell has no obstructions such as grid lines and welding strips on the front of the cell, which increases the photocurrent. The positive grid lines, negative grid lines and welding strips are all on the back of the cell of the BC cell. In a BC cell with a main grid, the main grid lines and auxiliary grid lines are used to collect current, and the welding strips are used to collect current. In a BC cell without a main grid, the auxiliary grid lines are used to collect current, and the welding strips are used to collect current.

[0003] In related art, the multiple welding ribbons of a BC battery are perpendicular to the positive and negative secondary gridlines. A portion of the welding ribbons is separated from the positive secondary gridline and welded to the negative secondary gridline. Another portion of the welding ribbons is separated from the negative secondary gridline and welded to the positive secondary gridline. However, during the welding process, the welding ribbons are prone to positional shifting, causing a short circuit between the aforementioned portion of the welding ribbon and the positive secondary gridline, or between the aforementioned portion of the welding ribbon and the negative secondary gridline, thereby affecting the normal operation of the photovoltaic module. 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 prevents short circuits when a first interconnecting structural member and a second interconnecting structural member are offset, thereby enabling the battery string and photovoltaic module to function normally for a long period of time.

[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 battery string of the embodiment of the first aspect of the present utility model, it includes: a plurality of battery cells, a plurality of first grid lines and a plurality of second grid lines are provided on one side surface of the battery cell, the plurality of first grid lines and the plurality of second grid lines are alternately arranged along a first direction, the polarity of the first grid lines and the second grid lines are opposite, the first grid lines include a plurality of first grid line segments arranged along a second direction, the second grid lines include a plurality of second grid line segments arranged along the second direction; a plurality of first interconnecting structures and a plurality of second interconnecting structures, the plurality of battery cells are electrically connected through the plurality of first interconnecting structures and the plurality of second interconnecting structures, the plurality of first interconnecting structures and the plurality of second interconnecting structures are alternately arranged along the second direction, the first interconnecting structures are A connecting structure is provided between two adjacent first gate line segments of a plurality of first gate lines, and the first interconnection structure is spaced apart from the ends of the two adjacent first gate line segments, the first interconnection structure is electrically connected to the plurality of second gate lines respectively, the second interconnection structure is provided between two adjacent second gate line segments of a plurality of second gate lines, and the second interconnection structure is spaced apart from the ends of the two adjacent second gate line segments, the second interconnection structure is electrically connected to the plurality of first gate lines respectively, a first insulating layer is provided on the outer peripheral surface of the portion of the first interconnection structure located between the two adjacent first gate line segments, and a second insulating layer is provided on the outer peripheral surface of the portion of the second interconnection structure located between the two adjacent second gate line segments.

[0008] According to the battery string of the present invention, the first insulating layer further separates and insulates the first interconnecting structure from the first grid line segment, while the second insulating layer further separates and insulates the second interconnecting structure from the second grid line segment. When the first interconnecting structure and the second interconnecting structure are offset, a short circuit in the battery string is avoided, thereby extending the service life of the battery string. In addition, the first insulating layer is grown on the outer peripheral surface of the first interconnecting structure, and the first insulating layer and the first interconnecting structure can be integrated. The second insulating layer is grown on the outer peripheral surface of the second interconnecting structure, and the second insulating layer and the second interconnecting structure can be integrated. This improves the stability of the first insulating layer and the second insulating layer, reduces the difficulty of forming the first insulating layer and the second insulating layer, thereby improving the performance of the battery string and also improving the production efficiency of the battery string.

[0009] According to some embodiments of the present invention, the first insulating layer extends along the first direction, and the end of the first insulating layer is spaced apart from the adjacent second gate line; and / or the second insulating layer extends along the first direction, and the end of the second insulating layer is spaced apart from the adjacent first gate line.

[0010] According to some embodiments of the present invention, the distance between the end of the first gate line segment and the first interconnection structure is L1, and the length of the first insulating layer along the first direction is L2, wherein L1 and L2 satisfy: 1cm≥L2≥2√2L1; and / or, the distance between the end of the second gate line segment and the second interconnection structure is L3, and the length of the second insulating layer along the first direction is L4, wherein L3 and L4 satisfy: 1cm≥L4≥2√2L3.

[0011] According to some embodiments of the present invention, the thickness of the first insulating layer is w1, wherein w1 satisfies: 0.2 mm ≤ w1 ≤ 20 mm; and / or the thickness of the second insulating layer is w2, wherein w2 satisfies: 0.2 mm ≤ w2 ≤ 20 mm.

[0012] According to some embodiments of the present invention, a first insulating connector is provided on one end of each of the first gate line segments close to the first interconnection structure; and / or a second insulating connector is provided on one end of each of the second gate line segments close to the second interconnection structure.

[0013] According to some embodiments of the present invention, a third insulating layer is provided on the outer peripheral surface of one end of the plurality of first gate line segments close to the first interconnection structure; and / or a fourth insulating layer is provided on the outer peripheral surface of one end of the plurality of second gate line segments close to the second interconnection structure.

[0014] According to some embodiments of the present invention, a first break opening is defined between two adjacent first gate line segments, and the number of the first break openings of multiple first gate lines is equal and opposite to each other along the first direction; a second break opening is defined between two adjacent second gate line segments, and the number of the second break openings of multiple second gate lines is equal and opposite to each other along the first direction, and the first break openings and the second break openings are staggered.

[0015] According to some embodiments of the present invention, the length of the first break in the second direction is L5, wherein L5 satisfies: 0.4mm≤L5≤1.6mm; and / or the length of the second break in the second direction is L6, wherein L6 satisfies: 0.4mm≤L6≤1.6mm.

[0016] According to some embodiments of the present invention, a plurality of grooves are formed on the one side surface of the battery cell, the plurality of grooves are arranged at intervals along the first direction, the grooves extend along the second direction, and a portion of a plurality of the first grid lines and a portion of a plurality of the second grid lines are respectively fitted into the plurality of grooves.

[0017] According to some embodiments of the present invention, the first insulating layer is an oxide film formed on the surface of the first interconnection structure; and / or the second insulating layer is an oxide film formed on the surface of the second interconnection structure.

[0018] The photovoltaic assembly according to the second embodiment of the present invention includes a battery string according to the first embodiment of the present invention.

[0019] The photovoltaic power generation system according to the third embodiment of the present invention includes the battery string according to the first embodiment of the present invention, or the photovoltaic module according to the second embodiment of the present invention.

[0020] 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

[0021] 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:

[0022] Figure 1 is a partial schematic diagram of a battery string according to an embodiment of the present utility model;

[0023] Figure 2 is a schematic diagram of a first insulating layer and a first interconnecting structure of a battery string according to an embodiment of the present invention;

[0024] Figure 3 yes Figure 2 A cross-sectional view of the first interconnect structure, wherein the first gate line segment and the second interconnect structure are not shown;

[0025] Figure 4 is a schematic diagram of a second insulating layer and a second interconnecting structure of a battery string according to an embodiment of the present invention;

[0026] Figure 5 yes Figure 4 A cross-sectional view of the second interconnect structure, wherein the second gate line segment and the first interconnect structure are not shown;

[0027] Figure 6 is a schematic diagram of a third insulating layer and a first grid line segment of a battery string according to an embodiment of the present utility model;

[0028] Figure 7 yes Figure 6 A cross-sectional view of the first gate line segment;

[0029] Figure 8 is a schematic diagram of a fourth insulating layer and a second grid line segment of a battery string according to an embodiment of the present utility model;

[0030] Figure 9 yes Figure 8 Cross-sectional view of the second gate line segment.

[0031] Reference numerals:

[0032] 100. Battery string;

[0033] 1. Battery cells;

[0034] 2. First grid line; 21. First grid line segment;

[0035] 212. Third insulating layer; 213. First disconnection port;

[0036] 3. Second grid line; 31. Second grid line segment;

[0037] 312. Fourth insulating layer; 313. Second disconnection port;

[0038] 4. First interconnection structure; 41. First insulation layer;

[0039] 5. Second interconnection structure; 51. Second insulation layer;

[0040] 6. Groove. DETAILED DESCRIPTION

[0041] 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 utility model is described.

[0042] 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, a plurality of first interconnecting structural members 4 and a plurality of second interconnecting structural members 5. In the description of the present invention, "plurality" means two or more.

[0043] Specifically, a plurality of first grid lines 2 and a plurality of second grid lines 3 are provided on one side surface of the battery cell 1. The plurality of first grid lines 2 and the plurality of second grid lines 3 are arranged along a first direction (ie Figure 1 The first grid lines 2 and the second grid lines 3 are arranged alternately and spaced apart, and the polarities of the first grid lines 2 and the second grid lines 3 are opposite. The first grid lines 2 include a plurality of grid lines extending in the second direction (i.e. Figure 1 The second gate line 3 includes a plurality of first gate line segments 21 arranged at intervals along the left and right directions (in the left and right directions), and the second gate line 3 includes a plurality of second gate line segments 31 arranged at intervals along the second direction.

[0044] For example, in Figure 1In the example, multiple first grid lines 2 and multiple second grid lines 3 are alternately arranged in the vertical direction, both first grid lines 2 and second grid lines 3 extend in the horizontal direction, multiple first grid line segments 21 are arranged in the horizontal direction, and multiple second grid line segments 31 are arranged in the horizontal direction. The opposite polarity of the first grid lines 2 and the second grid lines 3 can be understood as follows: when the first grid lines 2 are positive grid lines, the second grid lines 3 are negative grid lines; when the first grid lines 2 are negative grid lines, the second grid lines 3 are positive grid lines.

[0045] This arrangement reduces the amount of material (e.g., silver paste) used for the first and second gate lines 2, 3, thereby reducing the printing cost of the first and second gate lines 2, 3, and further reducing the production cost of the cell 1. Furthermore, the first and second gate line segments 21, 31 have a simple structure and are easy to produce, thereby increasing the production cost of the cell 1.

[0046] Reference Figure 1 , multiple battery cells 1 are electrically connected through multiple first interconnection structures 4 and multiple second interconnection structures 5, and the multiple first interconnection structures 4 and the multiple second interconnection structures 5 are alternately arranged along the second direction. The first interconnection structure 4 is arranged between two adjacent first gate line segments 21 of the multiple first gate lines 2, and the first interconnection structure 4 and the ends of the two adjacent first gate line segments 21 are spaced apart from each other. The first interconnection structure 4 is electrically connected to the multiple second gate lines 3 respectively. The second interconnection structure 5 is arranged between two adjacent second gate line segments 31 of the multiple second gate lines 3, and the second interconnection structure 5 and the ends of the two adjacent second gate line segments 31 are spaced apart from each other. The second interconnection structure 5 is electrically connected to the multiple first gate lines 2 respectively.

[0047] For example, in Figure 1 In the example, multiple first interconnection structures 4 are respectively insulated and connected to multiple first gate lines 2, multiple first interconnection structures 4 are respectively spaced apart from the ends of corresponding multiple first gate line segments 21, multiple first interconnection structures 4 are respectively electrically connected to multiple second gate lines 3, multiple second interconnection structures 5 are respectively insulated and connected to multiple second gate lines 3, multiple second interconnection structures 5 are respectively spaced apart from the ends of corresponding multiple second gate line segments 31, and multiple second interconnection structures 5 are respectively electrically connected to multiple first gate lines 2.

[0048] It should be noted that the connection relationship between each first interconnecting structural member 4 and each second interconnecting structural member 5 and the battery cell 1 is similar. For a first interconnecting structural member 4, a first interconnecting structural member 4 is electrically connected to a plurality of second grid line segments 31 opposite to each other in the vertical direction, for example, by welding, and is located between two adjacent first grid line segments 21 and spaced apart from the two adjacent first grid line segments 21 to achieve an insulated connection with the first grid line 2. For a second interconnecting structural member 5, a second interconnecting structural member 5 is electrically connected to a plurality of first grid line segments 21 opposite to each other in the vertical direction, for example, by welding, and is located between two adjacent second grid line segments 31 and spaced apart from the two adjacent second grid line segments 31 to achieve an insulated connection with the second grid line 3.

[0049] In this way, by setting up multiple first grid line segments 21 and second grid line segments 31, it is possible to achieve an insulated connection between the first grid line 2 and the first interconnecting structural member 4, and an insulated connection between the second grid line 3 and the second interconnecting structural member 5, thereby improving the reliability of the battery cell 1. In addition, there is no need to use other structural members or insulating members (such as insulating glue) to achieve insulation, which reduces the amount of insulating members used, reduces costs, simplifies the structure of the battery cell 1, facilitates production and processing, and has low production costs. In addition, the first interconnecting structural member 4 can derive the current of the multiple second grid line segments 31 of the multiple second grid lines 3 that are opposite to each other along the first direction, and the second interconnecting structural member 5 can derive the current of the multiple first grid line segments 21 of the multiple first grid lines 2 that are opposite to each other along the first direction, so as to achieve electrical connection between the multiple battery cells 1, thereby improving the photoelectric conversion amount of the battery string 100. In addition, by providing a plurality of first gate line segments 21 and a plurality of second gate line segments 31, the free ends of two adjacent first gate line segments 21 are separated from the corresponding first interconnection structure 4, and the free ends of two adjacent second gate line segments 31 are separated from the corresponding second interconnection structure 5 to achieve an insulated connection between the second interconnection structure 5 and the second gate line 3, thereby simplifying the structure of the battery cell 1 and facilitating the connection of multiple battery cells 1.

[0050] Reference Figure 2 and Figure 4 The first interconnect structure 4 has a first insulating layer 41 on its outer peripheral surface between two adjacent first gate line segments 21 , and the second interconnect structure 5 has a second insulating layer 51 on its outer peripheral surface between two adjacent second gate line segments 31 .

[0051] For example, in Figure 2-Figure 5In the example, the first insulating layer 41 wraps the portion of the first interconnect structure 4 located between the two adjacent first grid line segments 21, and the second insulating layer 51 wraps the portion of the second interconnect structure 5 located between the two second grid line segments 31. In this way, the first interconnect structure 4 is further separated and insulated from the first grid line segment 21 by the first insulating layer 41, so that when the position of the first interconnect structure 4 is offset, the first interconnect structure 4 is effectively avoided from contacting the two adjacent first grid line segments 21, and the first interconnect structure 4 is prevented from short-circuiting with the first grid line 2. At the same time, the second interconnect structure 5 is further separated and insulated from the second grid line segment 31 by the second insulating layer 51, so that when the position of the second interconnect structure 5 is offset, the second interconnect structure 5 is effectively avoided from contacting the two adjacent second grid line segments 31, and the second interconnect structure 5 is prevented from short-circuiting with the second grid line 3, thereby contributing to the long-term normal use of the battery cell 1, extending the service life of the battery cell 1, and extending the service life of the battery string 100.

[0052] Furthermore, the first insulating layer 41 is grown on the outer circumference of the first interconnecting structural member 4, and the first insulating layer 41 and the first interconnecting structural member 4 can be integral. The second insulating layer 51 is grown on the outer circumference of the second interconnecting structural member 5, and the second insulating layer 51 and the second interconnecting structural member 5 can be integral. This prevents the first insulating layer 41 from falling off the first interconnecting structural member 4, and prevents the second insulating layer 51 from falling off the second interconnecting structural member 5. This improves the operational stability of the first insulating layer 41 and the second insulating layer 51, and enhances the operational performance of the battery string 100. Furthermore, the difficulty of forming the first insulating layer 41 and the second insulating layer 51 is reduced, and the production efficiency of the first insulating layer 41 and the second insulating layer 51 is improved.

[0053] According to the battery string 100 of the present invention, the first insulating layer 41 further separates and insulates the first interconnecting structure 4 from the first grid line segment 21, while the second insulating layer 51 further separates and insulates the second interconnecting structure 5 from the second grid line segment 31. When the first interconnecting structure 4 and the second interconnecting structure 5 are offset, the battery string 100 is prevented from short-circuiting, thereby extending the service life of the battery string 100. In addition, the first insulating layer 41 grows on the outer peripheral surface of the first interconnecting structure 4, and the first insulating layer 41 and the first interconnecting structure 4 can be integral. The second insulating layer 51 grows on the outer peripheral surface of the second interconnecting structure 5, and the second insulating layer 51 and the second interconnecting structure 5 can be integral. This improves the operational stability of the first insulating layer 41 and the second insulating layer 51, reduces the difficulty of forming the first insulating layer 41 and the second insulating layer 51, thereby improving the operational performance of the battery string 100 and also improving the production efficiency of the battery string 100.

[0054] According to some embodiments of the present invention, for example, Figure 2and Figure 4 In the example of FIG. 4 , the first insulating layer 41 is arranged along the first direction (ie Figure 2 The end of the first insulating layer 41 is spaced apart from the adjacent second gate line 3; and / or the second insulating layer 51 extends along the first direction, and the end of the second insulating layer 51 is spaced apart from the adjacent first gate line 2.

[0055] For example, the first insulating layer 41 and the second insulating layer 51 are provided in the following situations: First, only the first insulating layer 41 extends along the first direction, and the end of the first insulating layer 41 is spaced apart from the adjacent second gate line 3 (eg, Figure 2 Second, only the second insulating layer 51 extends along the first direction, and the end of the second insulating layer 51 is spaced apart from the adjacent first gate line 2 (as shown in FIG. Figure 4 Third, the first insulating layer 41 extends along the first direction, and the end of the first insulating layer 41 is spaced apart from the adjacent second gate line 3. Meanwhile, only the second insulating layer 51 extends along the first direction, and the end of the second insulating layer 51 is spaced apart from the adjacent first gate line 2.

[0056] This arrangement prevents the end of the first insulating layer 41 from interfering with the electrical connection between the first interconnecting structure 4 and the second grid lines 3, thereby facilitating the normal collection of currents converted on the plurality of second grid lines 3 by the first interconnecting structure 4, allowing the battery string 100 to function normally for a long period of time. Simultaneously, the end of the second insulating layer 51 is prevented from interfering with the electrical connection between the second interconnecting structure 5 and the first grid lines 2, thereby facilitating the normal collection of currents converted on the plurality of first grid lines 2 by the second interconnecting structure 5, allowing the battery string 100 to function normally for a long period of time, thereby extending the service life of the battery cell 1.

[0057] According to some embodiments of the present invention, referring to Figure 1 and Figure 2, the distance between the end of the first grid line segment 21 and the first interconnection structure 4 is L1, and the length of the first insulating layer 41 along the first direction (i.e., the up and down direction) is L2, wherein L1 and L2 satisfy: 1cm≥L2≥2√2L1. For example, when the length of the first insulating layer 41 is less than 2√2L1, the length of the first insulating layer 41 is shorter, which reduces the protection range of the first insulating layer 41. When the first interconnection structure 4 is offset in the left and right directions and the up and down directions, the first interconnection structure 4 is easy for the first grid line segment 21 to contact, resulting in a short circuit. When the length of the first insulating layer 41 is greater than 1cm, the length of the first insulating layer 41 is larger, which increases the material consumption and improves production costs. In this way, by controlling the distance between the end of the first grid line segment 21 and the first interconnection structure 4 along the left and right directions, the length of the first insulating layer 41 is controlled, and the arrangement is reasonable. When the first interconnection structure 4 is offset, the first interconnection structure 4 is effectively avoided from contacting the first grid line segment 21, thus avoiding a short circuit. Furthermore, it is convenient to rationally control the material usage of the first insulating layer 41, thereby reducing the production cost of the first insulating layer 41 and the production cost of the battery string 100. For example, when L2 = 2√2L1, the upper half of the first insulating layer 41 is located between the first gate line 2 and the second gate line 3 adjacent to and above the first gate line 2, and the length of the upper half of the first insulating layer 41 is √2L1. The lower half of the first insulating layer 41 is located between the first gate line 2 and the second gate line 3 adjacent to and below the first gate line 2, and the length of the lower half of the first insulating layer 41 is √2L1. The length of the first insulating layer 41 is the sum of the length of the upper half of the first insulating layer 41 and the length of the lower half of the first insulating layer 41, that is, the length L2 of the first insulating layer 41 is 2√2L1.

[0058] According to other embodiments of the present invention, referring to Figure 1 and Figure 4, the distance between the end of the second gate line segment 31 and the second interconnect structure 5 is L3, and the length of the second insulating layer 51 along the first direction is L4, wherein L3 and L4 satisfy: 1cm≥L4≥2√2L3. For example, when the length of the second insulating layer 51 is less than 2√2L3, the length of the second insulating layer 51 is shorter, reducing the protection range of the second insulating layer 51. When the second interconnect structure 5 deviates in both the left and right directions and the up and down directions, the second interconnect structure 5 is prone to contact with the second gate line segment 31, resulting in a short circuit. When the length of the second insulating layer 51 is greater than 1cm, the length of the second insulating layer 51 is larger, increasing the amount of material used and raising production costs. In this way, by controlling the distance between the end of the second gate line segment 31 and the second interconnect structure 5 along the left and right directions, the length of the second insulating layer 51 is controlled. The arrangement is reasonable. When the second interconnect structure 5 deviates, the second interconnect structure 5 is effectively prevented from contacting the second gate line segment 31, thereby preventing a short circuit. Furthermore, it is convenient to rationally control the material usage of the second insulating layer 51, thereby reducing the production cost of the second insulating layer 51 and the production cost of the battery string 100. For example, when L4 = 2√2L3, the upper half of the second insulating layer 51 is located between the second gate line 3 and the first gate line 2 adjacent to and above the second gate line 3, and the length of the upper half of the second insulating layer 51 is √2L3. The lower half of the second insulating layer 51 is located between the second gate line 3 and the first gate line 2 adjacent to and below the second gate line 3, and the length of the lower half of the second insulating layer 51 is √2L3. The length of the second insulating layer 51 is the sum of the length of the upper half of the second insulating layer 51 and the length of the lower half of the second insulating layer 51, that is, the length L4 of the second insulating layer 51 is 2√2L3.

[0059] According to some further embodiments of the present invention, referring to Figure 1 、 Figure 2 and Figure 4, the distance between the end of the first gate line segment 21 and the first interconnection structure 4 is L1, the length of the portion of the first insulating layer 41 between the adjacent first gate line 2 and the second gate line 3 along the first direction is L2, the distance between the end of the second gate line segment 31 and the second interconnection structure 5 is L3, and the length of the portion of the second insulating layer 51 between the adjacent first gate line 2 and the second gate line 3 along the first direction is L4, where L1, L2, L3 and L4 satisfy: 1cm≥L2≥2√2L1, 1cm≥L4≥2√2L3. Thus, by controlling the distance between the end of the first grid line segment 21 and the first interconnecting structure 4 along the left-right direction, the length of the first insulating layer 41 is controlled, and by controlling the distance between the end of the second grid line segment 31 and the second interconnecting structure 5 along the left-right direction, the length of the second insulating layer 51 is controlled. The arrangement is reasonable. When the first interconnecting structure 4 and the second interconnecting structure 5 are offset, the first interconnecting structure 4 and the first grid line segment 21 are effectively avoided from contacting, and the second interconnecting structure 5 and the second grid line segment 31 are effectively avoided from contacting, thereby avoiding a short circuit. In addition, it is convenient to rationally control the material usage of the first insulating layer 41 and the second insulating layer 51, thereby reducing the production cost of the first insulating layer 41 and the second insulating layer 51, and reducing the production cost of the battery string 100. It should be noted that L1=L3, but is not limited to this.

[0060] According to some embodiments of the present invention, referring to Figure 3 , the thickness of the first insulating layer 41 is w1, wherein w1 satisfies: 0.2mm≤w1≤20mm. For example, when the thickness w1 of the first insulating layer 41 is less than 0.2mm, the thickness of the first insulating layer 41 is relatively small. During the installation and use of the battery string 100, the first insulating layer 41 is easily worn and broken, which reduces the insulation effect of the first insulating layer 41, and a short circuit is easily caused between the first interconnecting structure 4 and the first grid line 2, which makes it inconvenient for the battery string 100 to be used normally for a long time. When the thickness w1 of the first insulating layer 41 is greater than 20mm, the thickness of the first insulating layer 41 is relatively large, which increases the material consumption of the first insulating layer 41, thereby increasing the production cost of the first insulating layer 41. In addition, the height of the first interconnecting structure 4 is also increased, and the distance between the first interconnecting structure 4 and the second grid line 3 is increased, thereby increasing the difficulty of electrically connecting the first interconnecting structure 4 and the second grid line 3, thereby reducing the production efficiency of the battery string 100.

[0061] Thus, by setting the thickness w1 of the first insulating layer 41 to satisfy 0.2mm≤w1≤20mm, the thickness of the first insulating layer 41 is reasonably set, ensuring that the first insulating layer 41 is not easily worn and disconnected during the installation and use of the battery string 100, improving the insulation effect of the first insulating layer 41, and avoiding a short circuit between the first interconnecting structure 4 and the first grid line 2, thereby facilitating the normal use of the battery string 100 for a long time. In addition, the material usage of the first insulating layer 41 is reduced, and the production cost of the first insulating layer 41 is reduced. In addition, the height of the first interconnecting structure 4 is rationalized, and the distance between the first interconnecting structure 4 and the second grid line 3 is reduced, thereby reducing the difficulty of electrically connecting the first interconnecting structure 4 and the second grid line 3, and improving the production efficiency of the battery string 100.

[0062] According to other embodiments of the present invention, referring to Figure 5 , the thickness of the second insulating layer 51 is w2, wherein w2 satisfies: 0.2mm≤w2≤20mm. For example, when the thickness w2 of the second insulating layer 51 is less than 0.2mm, the thickness of the second insulating layer 51 is relatively small. During the installation and use of the battery string 100, the second insulating layer 51 is easily worn, which reduces the insulation effect of the second insulating layer 51, and a short circuit is easily caused between the second interconnecting structure 5 and the second grid line 3, which makes it inconvenient for the battery string 100 to be used normally for a long time. When the thickness w2 of the second insulating layer 51 is greater than 20mm, the thickness of the second insulating layer 51 is relatively large, which increases the material consumption of the second insulating layer 51, thereby increasing the production cost of the second insulating layer 51. In addition, the height of the second interconnecting structure 5 is also increased, and the distance between the second interconnecting structure 5 and the first grid line 2 is increased, thereby increasing the difficulty of electrically connecting the second interconnecting structure 5 to the first grid line 2, thereby reducing the production efficiency of the battery string 100.

[0063] Thus, by setting the thickness w2 of the second insulating layer 51 to satisfy 0.2mm≤w2≤20mm, the thickness of the second insulating layer 51 is reasonably set, ensuring that the second insulating layer 51 is not easily worn and disconnected during the installation and use of the battery string 100, improving the insulation effect of the second insulating layer 51, and avoiding a short circuit between the second interconnecting structure 5 and the second grid line 3, thereby facilitating the normal use of the battery string 100 for a long time. In addition, the material usage of the second insulating layer 51 is reduced, and the production cost of the second insulating layer 51 is reduced. In addition, the height of the second interconnecting structure 5 is rationalized, and the distance between the second interconnecting structure 5 and the first grid line 2 is reduced, thereby reducing the difficulty of electrically connecting the second interconnecting structure 5 and the first grid line 2, and improving the production efficiency of the battery string 100.

[0064] According to some further embodiments of the present invention, referring to Figure 3 and Figure 5, the thickness of the first insulating layer 41 is w1, and the thickness of the second insulating layer 51 is w2, wherein w1 and w2 satisfy: 0.2mm≤w1≤20mm, 0.2mm≤w2≤20mm. Thus, the thickness of the first insulating layer 41 and the second insulating layer 51 is reasonably set, ensuring that the first insulating layer 41 and the second insulating layer 51 are not easily worn and disconnected during the installation and use of the battery string 100, thereby improving the insulation effect and avoiding the occurrence of short circuits, thereby facilitating the normal use of the battery string 100 for a long time. In addition, the material usage of the first insulating layer 41 and the second insulating layer 51 is reduced, and the production cost of the first insulating layer 41 and the second insulating layer 51 is reduced. In addition, the height of the first interconnecting structure 4 and the second interconnecting structure 5 is rationalized, and the distance between the first interconnecting structure 4 and the second grid line 3 is reduced, thereby reducing the difficulty of electrically connecting the first interconnecting structure 4 and the second grid line 3, and reducing the distance between the second interconnecting structure 5 and the first grid line 2, thereby reducing the difficulty of electrically connecting the second interconnecting structure 5 and the first grid line 2, thereby improving the production efficiency of the battery string 100.

[0065] According to some embodiments of the present invention, a first insulating connector (not shown) is respectively provided on one end of the plurality of first gate line segments 21 close to the first interconnection structure 4; and / or, a second insulating connector (not shown) is respectively provided on one end of the plurality of second gate line segments 31 close to the second interconnection structure 5. For example, the arrangement of the first gate line segments 21 and the second gate line segments 31 includes the following situations: First, only a first insulating connector is respectively provided on one end of the plurality of first gate line segments 21 close to the first interconnection structure 4. Second, only a second insulating connector is respectively provided on one end of the plurality of second gate line segments 31 close to the second interconnection structure 5. Third, a first insulating connector is respectively provided on one end of the plurality of first gate line segments 21 close to the first interconnection structure 4. At the same time, a second insulating connector is respectively provided on one end of the plurality of second gate line segments 31 close to the second interconnection structure 5. Figure 6 and Figure 7 In the example, the ends of the plurality of first gate line segments 21 adjacent to the first interconnect structure 4 are covered with the first insulating connector, and the ends of the plurality of second gate line segments 31 adjacent to the second interconnect structure 5 are covered with the second insulating connector.

[0066] So set, the first grid line segment 21 is insulated from the first interconnection structure part 4 by the first insulating connector, the first interconnection structure part 4 is insulated from the first grid line segment 21 by the first insulating layer 41, thereby realizing the double insulation between the first grid line segment 21 and the first interconnection structure part 4, further avoiding the situation of short circuit when the first interconnection structure part 4 is installed offset.Meanwhile, the second grid line segment 31 is insulated from the second interconnection structure part 5 by the second insulating connector, and the second interconnection structure part 5 is insulated from the second grid line segment 31 by the second insulating layer 51, the double insulation between the second grid line segment 31 and the second interconnection structure part 5, also further avoiding the situation of short circuit when the second interconnection structure part 5 is installed offset, and then prolonging the service life of battery string 100.In addition, when ensuring insulation, the distance between the first grid line segment 21 and the first interconnection structure part 4 can be further shortened, the distance between the second grid line segment 31 and the second interconnection structure part 5 is further shortened, thereby increasing the ability of the first grid line 2 and the second grid line 3 to collect electrons, improving the power of battery string 100. It should be noted that the first insulating connector may be an insulating glue applied to the first gate line segment 21, or an insulating film layer formed on the first gate line segment 21. The second insulating connector may be an insulating glue applied to the second gate line 3, or an insulating film layer formed on the second gate line segment 31, but is not limited thereto.

[0067] According to some embodiments of the present invention, referring to Figure 6 and Figure 8 , a third insulating layer 212 is provided on the outer peripheral surface of one end of the plurality of first gate line segments 21 close to the first interconnection structure 4; and / or a fourth insulating layer 312 is provided on the outer peripheral surface of one end of the plurality of second gate line segments 31 close to the second interconnection structure 5. For example, the end portions of the plurality of first gate line segments 21 adjacent to the first interconnection structure 4 are all covered with the third insulating layer 212, and the end portions of the plurality of second gate line segments 31 adjacent to the second interconnection structure 5 are all covered with the fourth insulating layer 312. The arrangement of the first gate line segments 21 and the second gate line segments 31 includes the following situations: First, only the outer peripheral surface of the plurality of first gate line segments 21 close to the first interconnection structure 4 has the third insulating layer 212 (such as Figure 6 Second, only the outer peripheral surface of the second gate line segments 31 close to the second interconnection structure 5 has the fourth insulating layer 312 (as shown). Figure 8 Third, a third insulating layer 212 is formed on the outer circumference of one end of the plurality of first gate line segments 21 close to the first interconnect structure 4. Meanwhile, a fourth insulating layer 312 is formed on the outer circumference of one end of the plurality of second gate line segments 31 close to the second interconnect structure 5.

[0068] So set, by the third insulating layer 212, the first grid line segment 21 is insulated from the first interconnection structure 4, and the first insulating layer 41 insulates the first interconnection structure 4 from the first grid line segment 21, thereby realizing the double insulation between the first grid line segment 21 and the first interconnection structure 4, further avoiding the situation that the first interconnection structure 4 is short-circuited when the installation offset occurs. At the same time, the fourth insulating layer 312 insulates the second grid line segment 31 from the second interconnection structure 5, and the second insulating layer 51 insulates the second interconnection structure 5 from the second grid line segment 31, the double insulation between the second grid line segment 31 and the second interconnection structure 5, thereby further avoiding the situation that the second interconnection structure 5 is short-circuited when the installation offset occurs, thereby extending the service life of the battery string 100. In addition, while ensuring insulation, the distance between the first grid line segment 21 and the first interconnection structure 4 can be further shortened, and the distance between the second grid line segment 31 and the second interconnection structure 5 can be further shortened, thereby increasing the ability of the first grid line 2 and the second grid line 3 to collect electrons, and improving the power of the battery string 100. It should be noted that the third insulating layer 212 is an insulating and corrosion-resistant oxide film generated by chemical reaction on the first gate line segment 21, and the fourth insulating layer 312 is an insulating and corrosion-resistant oxide film generated by chemical reaction on the second gate line segment 31, but is not limited thereto.

[0069] According to some embodiments of the present invention, referring to Figure 1 A first disconnection opening 213 is defined between two adjacent first gate line segments 21. The number of the first disconnection openings 213 of the plurality of first gate lines 2 is equal and they are opposite to each other along the first direction. A second disconnection opening 313 is defined between two adjacent second gate line segments 31. The number of the second disconnection openings 313 of the plurality of second gate lines 3 is equal and they are opposite to each other along the first direction. The first disconnection openings 213 and the second disconnection openings 313 are staggered. For example, Figure 1 In the example, the plurality of first openings 213 of each first gate line 2 are arranged along the second direction (ie Figure 1The first disconnected openings 213 of each second grid line 3 are arranged in a plurality of rows relative to each other up and down, and the plurality of rows of the first disconnected openings 213 are arranged in a plurality of rows at intervals along the second direction. The second disconnected openings 313 of each second grid line 3 are arranged in a plurality of rows relative to each other up and down, and the plurality of rows of the second disconnected openings 313 and the plurality of rows of the first disconnected openings 213 are arranged alternately along the second direction. Thus, by arranging the first disconnected openings 213 and the second disconnected openings 313, the plurality of first interconnected structural members 4 can be insulated from the plurality of first grid lines 2 by being arranged at the corresponding plurality of first disconnected openings 213, and the plurality of second interconnected structural members 5 can be insulated from the plurality of second grid lines 3 by being arranged at the corresponding plurality of second disconnected openings 313. There is no need to adopt other structures for insulation, which is conducive to the connection of the battery cell 1 with the first interconnected structural member 4 and the second interconnected structural member 5.

[0070] According to some embodiments of the present invention, referring to Figure 1 The length of the first opening 213 in the second direction is L5, where L5 satisfies: 0.4 mm ≤ L5 ≤ 1.6 mm. And / or the length of the second opening 313 in the second direction is L6, where L6 satisfies: 0.4 mm ≤ L6 ≤ 1.6 mm.

[0071] For example, the settings of the first break opening 213 and the second break opening 313 include the following situations: First, the length of the first break opening 213 in the second direction is L5, L5 satisfies: 0.4mm≤L5≤1.6mm, and the length of the second break opening 313 is not limited. Second, the length of the second break opening 313 in the second direction is L6, L6 satisfies: 0.4mm≤L6≤1.6mm, and the length of the first break opening 213 is not limited. Third, the length of the first break opening 213 in the second direction is L5, the length of the second break opening 313 in the second direction is L6, L5 and L6 respectively satisfy: 0.4mm≤L5≤1.6mm, 0.4mm≤L6≤1.6mm.

[0072] When the length L5 of the first disconnection 213 is less than 0.4 mm, the length of the first disconnection 213 is relatively small, so that when the multiple battery cells 1 are electrically connected through the first interconnection structure 4, the distance between the side of the first interconnection structure 4 and the side of the first disconnection 213 corresponding to the first grid line 2 is relatively small, and the first interconnection structure 4 is easily in contact with the adjacent first grid line segment 21, so that the battery string 100 is prone to short circuit, which is not conducive to the normal use of the battery string 100. In addition, it also increases the difficulty of assembling the battery cell 1 and the first interconnection structure 4, and reduces the assembly efficiency of the battery string 100. When the length L5 of the first disconnection 213 is greater than 1.6 mm, the length of the first disconnection 213 is relatively large, shortening the length of the first grid line 2, reducing the area occupied by the first grid line 2 on the battery cell 1, thereby reducing the utilization of the surface of the battery cell 1, and further reducing the utilization efficiency of the battery cell 1.

[0073] When the length L6 of the second disconnection opening 313 is less than 0.4 mm, the length of the second disconnection opening 313 is relatively small. Therefore, when the plurality of battery cells 1 are electrically connected through the second interconnection structure 5, the distance between the side of the second interconnection structure 5 and the side of the corresponding second disconnection opening 313 of the second grid line 3 is relatively small. The second interconnection structure 5 is easily in contact with the adjacent second grid line segment 31, so that the battery string 100 is prone to short circuit, which is not conducive to the normal use of the battery string 100. In addition, it also increases the difficulty of assembling the battery cell 1 and the second interconnection structure 5, and reduces the assembly efficiency of the battery string 100. When the length L6 of the second disconnection opening 313 is greater than 1.6 mm, the length of the second disconnection opening 313 is relatively large, shortening the length of the second grid line 3, reducing the area occupied by the second grid line 3 on the battery cell 1, thereby reducing the utilization rate of the surface of the battery cell 1, and further reducing the use efficiency of the battery cell 1.

[0074] Thus, by setting the length L5 of the first disconnection opening 213 in the second direction and the length L6 of the second disconnection opening 313 in the second direction to respectively satisfy the following conditions: 0.4mm≤L5≤1.6mm, 0.4mm≤L6≤1.6mm, the length of the first disconnection opening 213 and the length of the second disconnection opening 313 are reasonably set, so that when the multiple battery cells 1 are electrically connected through the first interconnection structure 4 and the second interconnection structure 5, a short circuit in the battery string 100 can be avoided, thereby extending the service life of the battery string 100. In addition, the material usage of the first grid line 2 and the second grid line 3 can be reduced while ensuring the occupied area of ​​the first grid line 2 and the second grid line 3, which is more conducive to the use of the battery cell 1. In addition, the difficulty of assembling the battery cell 1 and the interconnection structure is reduced, thereby improving the assembly efficiency of the battery string 100.

[0075] According to some embodiments of the present invention, referring to Figure 7 and Figure 9A plurality of grooves 6 are formed on one side surface of the battery cell 1. The plurality of grooves 6 are arranged at intervals along the first direction and extend along the second direction. Parts of the plurality of first grid lines 2 and parts of the plurality of second grid lines 3 are respectively fitted into the plurality of grooves 6.

[0076] For example, in Figure 7 and Figure 9 In the example shown in FIG1 , multiple grooves 6 are formed on one side of the cell 1 where the first grid lines 2 and the second grid lines 3 are provided. The lower portions of the multiple first grid lines 2 and the lower portions of the multiple second grid lines 3 fit within the multiple grooves 6. This arrangement increases the contact area between the first grid lines 2 and the cell 1, and increases the contact area between the second grid lines 3 and the cell 1. This improves the ability of the first grid lines 2 and the second grid lines 3 to collect electrons, thereby improving the photoelectric conversion capability of the cell string 100.

[0077] According to some embodiments of the present invention, the first insulating layer 41 is an oxide film formed on the surface of the first interconnect structure 4. And / or, the second insulating layer 51 is an oxide film formed on the surface of the second interconnect structure 5. For example, the first insulating layer 41 and the second insulating layer 51 may be provided in the following situations: First, the first insulating layer 41 is an oxide film formed on the surface of the first interconnect structure 4. Second, the second insulating layer 51 is an oxide film formed on the surface of the second interconnect structure 5. Third, the first insulating layer 41 is an oxide film formed on the surface of the first interconnect structure 4. At the same time, the second insulating layer 51 is an oxide film formed on the surface of the second interconnect structure 5.

[0078] With such an arrangement, the oxide film has corrosion resistance and good mechanical properties, thereby improving the insulation effect of the first insulating layer 41 and the second insulating layer 51, effectively preventing short circuits, and also improving the use effect of the first insulating layer 41 and the second insulating layer 51. Among them, the first insulating layer 41 can be generated on the first interconnect structure 4 by a chemical reaction, and the first insulating layer 41 is integral with the first interconnect structure 4, and the second insulating layer 51 is formed on the second interconnect structure 5, and the second insulating layer 51 is integral with the second interconnect structure 5. It should be noted that the oxide film can be a single oxide film, a composite oxide film, a gradient oxide film or a metal ceramic film, but is not limited thereto. It should be noted that the first insulating layer 41 can also be formed on the surface of the first interconnect structure 4, and the second insulating layer 51 can be formed on the surface of the second interconnect structure 5, and then the first insulating layer 41 corresponding to the place where the first interconnect structure 4 is electrically connected to the second gate line 3 is removed (for example, ground off), and the second insulating layer 51 corresponding to the place where the second interconnect structure 5 is electrically connected to the first gate line 2 is removed (for example, ground off), and then electrically connected.

[0079] 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.

[0080] According to the photovoltaic module of the present invention, by adopting the above-mentioned battery string 100, short circuit of the photovoltaic module is avoided, and the performance of the photovoltaic module is improved.

[0081] 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.

[0082] According to the photovoltaic power generation system of the present invention, by adopting the above-mentioned battery string 100 or photovoltaic module, short circuit is avoided and the performance of the photovoltaic power generation system is improved.

[0083] Other structures and operations of the battery string 100, photovoltaic assembly and 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.

[0084] In the description of the present invention, it should be understood that the terms "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "inside", "outside", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0085] 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.

[0086] 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 first grid lines and a plurality of second grid lines are provided on one side surface of the battery cells, the plurality of first grid lines and the plurality of second grid lines are alternately arranged along a first direction, the first grid lines and the second grid lines have opposite polarities, the first grid lines include a plurality of first grid line segments arranged along a second direction, and the second grid lines include a plurality of second grid line segments arranged along the second direction; A plurality of first interconnecting structures and a plurality of second interconnecting structures, wherein the plurality of battery cells are electrically connected through the plurality of first interconnecting structures and the plurality of second interconnecting structures, wherein the plurality of first interconnecting structures and the plurality of second interconnecting structures are alternately arranged along the second direction, wherein the first interconnecting structure is provided between two adjacent first gate line segments of the plurality of first gate lines, and the first interconnecting structure is spaced apart from the ends of the two adjacent first gate line segments, and the first interconnecting structure is electrically connected to the plurality of second gate lines respectively, and the second interconnecting structure is provided between two adjacent second gate line segments of the plurality of second gate lines, and the second interconnecting structure is spaced apart from the ends of the two adjacent second gate line segments, and the second interconnecting structure is electrically connected to the plurality of first gate lines respectively, and a first insulating layer is provided on the outer peripheral surface of the portion of the first interconnecting structure located between the two adjacent first gate line segments, and a second insulating layer is provided on the outer peripheral surface of the portion of the second interconnecting structure located between the two adjacent second gate line segments.

2. The battery string according to claim 1, characterized in that: The first insulating layer extends along the first direction, and an end portion of the first insulating layer is spaced apart from an adjacent second gate line; and / or The second insulating layer extends along the first direction, and an end portion of the second insulating layer is spaced apart from the adjacent first gate line.

3. The battery string according to claim 2, characterized in that: The distance between the end of the first gate line segment and the first interconnect structure is L1, and the length of the first insulating layer along the first direction is L2, wherein L1 and L2 satisfy: 1cm≥L2≥2√2L1; and / or The distance between the end of the second gate line segment and the second interconnection structure is L3, and the length of the second insulating layer along the first direction is L4, wherein L3 and L4 satisfy: 1cm≥L4≥2√2L3.

4. The battery string according to claim 1, characterized in that The thickness of the first insulating layer is w1, wherein w1 satisfies: 0.2 mm ≤ w1 ≤ 20 mm; and / or The thickness of the second insulating layer is w2, wherein w2 satisfies: 0.2 mm ≤ w2 ≤ 20 mm.

5. The battery string according to claim 1, characterized in that: A first insulating connector is respectively provided on one end of each of the first gate line segments close to the first interconnection structure; and / or A second insulating connector is respectively provided on one end of each of the plurality of second gate line segments close to the second interconnection structure.

6. The battery string according to claim 1, characterized in that: A third insulating layer is formed on the outer peripheral surface of one end of the plurality of first gate line segments close to the first interconnection structure; and / or A fourth insulating layer is formed on outer peripheral surfaces of the plurality of second gate line segments adjacent to one end of the second interconnection structure.

7. The battery string according to claim 1, characterized in that: A first disconnection is defined between two adjacent first gate line segments, and the first disconnections of the plurality of first gate lines are equal in number and opposite to each other along the first direction; A second break opening is defined between two adjacent second gate line segments. The second break openings of the second gate lines are equal in number and opposite to each other along the first direction. The first break openings and the second break openings are staggered.

8. The battery string according to claim 7, characterized in that: The length of the first opening in the second direction is L5, wherein L5 satisfies: 0.4 mm ≤ L5 ≤ 1.6 mm; and / or The length of the second break in the second direction is L6, wherein L6 satisfies: 0.4 mm ≤ L6 ≤ 1.6 mm.

9. The battery string according to claim 1, characterized in that: A plurality of grooves are formed on the one side surface of the battery cell, the plurality of grooves are arranged at intervals along the first direction, the grooves extend along the second direction, and a portion of a plurality of the first grid lines and a portion of a plurality of the second grid lines are respectively fitted into the plurality of grooves.

10. The battery string according to any one of claims 1 to 9, characterized in that: The first insulating layer is an oxide film formed on the surface of the first interconnection structure; and / or The second insulating layer is an oxide film formed on a surface of the second interconnection structure.

11. A photovoltaic module, characterized in that: The method comprises the battery string according to any one of claims 1 to 10.

12. A photovoltaic power generation system, characterized in that: The method comprises the cell string according to any one of claims 1 to 10, or the photovoltaic module according to claim 11.

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