Battery piece, battery string, photovoltaic module and photovoltaic power generation system

Abstract

The utility model discloses a battery piece, a battery string, a photovoltaic assembly and a photovoltaic power generation system. The battery piece comprises a battery piece body. The first grid line comprises a plurality of first grid line segments arranged at intervals in the second direction, two adjacent first grid line segments, adjacent to the first edge grid line, of at least one of the first grid lines are connected with each other to form a first diversion grid line, and the width of at least one part of the first diversion grid line is larger than that of the first grid line segment; the second grid line comprises a plurality of second grid line segments arranged at intervals in the second direction, two adjacent second grid line segments, adjacent to the second edge grid line, of at least one of the second grid lines are connected with each other to form a second diversion grid line, and the width of at least one part of the second diversion grid line is larger than that of the second grid line segment. According to the battery piece provided by the utility model, through the arrangement of the first diversion grid lines and the second diversion grid lines, the leading-out of current collected on the plurality of first grid lines and the plurality of second grid lines is facilitated, and the use of the battery piece is facilitated.

Description

Technical Field

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

[0002] Back-contact solar cells are cells that place both the emitter and base contact electrodes on the back side of the cell (non-light-receiving side), and the light-receiving side of the cell is not blocked by any metal electrode. In related technologies, cells have a main grid design, which consumes a lot of silver and has high production costs. For cells without a main grid, it is important to ensure that the current of multiple secondary grids can be drawn out while also ensuring the normal use of the battery. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a battery cell, which is conducive to the extraction of current collected on multiple first grid lines and multiple second grid lines through the arrangement of first guide grid lines and second guide grid lines, and is conducive to the use of the battery cell.

[0004] The second objective of the present invention is to provide a battery string using the above-mentioned battery cell.

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

[0006] The fourth objective of the present utility model is to provide a photovoltaic power generation system using the above-mentioned battery cell, battery string or photovoltaic module.

[0007] According to the first aspect of the utility model, the battery cell comprises: a battery cell body; a first edge grid line and a second edge grid line, the first edge grid line and the second edge grid line are arranged on one side of the battery cell body in the thickness direction, the first edge grid line and the second edge grid line extend along the first direction, the first edge grid line and the second edge grid line are respectively arranged on both sides of the battery cell body in the second direction, and the first direction is perpendicular to the second direction; a plurality of first grid lines and a plurality of second grid lines, the first grid lines and the second grid lines are arranged on the one side of the battery cell body in the thickness direction, the plurality of first grid lines and the plurality of second grid lines are alternately arranged along the first direction, the first grid lines and the second grid lines have opposite polarities, one end of the plurality of first grid lines is connected to the first edge grid line, and the plurality of first grid lines are connected to the first edge grid line. The other end of each of the plurality of second gate lines is spaced apart from the second edge gate line, one end of each of the plurality of second gate lines is spaced apart from the first edge gate line, the other end of each of the plurality of second gate lines is connected to the second edge gate line, the first gate line comprises a plurality of first gate line segments spaced apart along the second direction, two adjacent first gate line segments of at least one of the plurality of first gate lines adjacent to the first edge gate line are connected to each other to form a first guide gate line, a width of at least a portion of the first guide gate line is greater than a width of the first gate line segment, the second gate line comprises a plurality of second gate line segments spaced apart along the second direction, two adjacent second gate line segments of at least one of the plurality of second gate lines adjacent to the second edge gate line are connected to each other to form a second guide gate line, a width of at least a portion of the second guide gate line is greater than a width of the second gate line segment.

[0008] According to the battery cell of the embodiment of the utility model, by setting the width of at least a part of the first current guiding grid line to be greater than the width of the first grid line segment, the resistance can be reduced, which is more conducive to the collection and extraction of the current of the multiple first grid line segments. Similarly, since the current of the multiple second grid line segments is extracted to the first interconnection structure adjacent to the second edge grid line through the second current guiding grid line, the current on the second current guiding grid line increases. By setting the width of at least a part of the second current guiding grid line to be greater than the width of the second grid line segment, the resistance can be reduced, which is more conducive to the collection and extraction of the current of the multiple second grid line segments, so as to facilitate the normal use of the battery cell.

[0009] According to some embodiments of the present invention, the ratio of the width of at least a portion of the first guide gate line to the width of the first gate line segment is b1, wherein b1 satisfies: 2≤b1≤3; and / or, the ratio of the width of at least a portion of the second guide gate line to the width of the second gate line segment is b2, wherein b2 satisfies: 2≤b2≤3.

[0010] According to some embodiments of the present invention, a first break is defined between two adjacent first gate line segments, and the first break of multiple first gate lines is opposite to each other along the first direction; a second break is defined between two adjacent second gate line segments, and the second break of multiple second gate lines is opposite to each other along the first direction; one end of at least a portion of the first guide gate line is connected to the first edge gate line, and the other end of at least a portion of the first guide gate line extends to a position opposite to the second break along the first direction; and / or one end of at least a portion of the second guide gate line is connected to the second edge gate line, and the other end of at least a portion of the second guide gate line extends to a position opposite to the first break along the first direction.

[0011] According to some embodiments of the present invention, the other end of the at least a portion of the first guide grid line extends to a position opposite to the second break opening adjacent to the first edge grid line along the first direction; and / or the other end of the at least a portion of the second guide grid line extends to a position opposite to the first break opening adjacent to the second edge grid line along the first direction.

[0012] According to some embodiments of the present invention, the length of the first break in the second direction is L1, wherein L1 satisfies: 0.4mm≤L1≤1.6mm; and / or the length of the second break in the second direction is L2, wherein L2 satisfies: 0.4mm≤L2≤1.6mm.

[0013] According to some embodiments of the present invention, there are multiple first guide wires, and the multiple first guide wires are arranged at intervals along the first direction; and / or there are multiple second guide wires, and the multiple second guide wires are arranged at intervals along the first direction.

[0014] According to some embodiments of the present invention, the ratio of the width of the first edge gate line to the width of the first gate line segment is b3, wherein b3 satisfies: 2≤b3≤3; and / or the ratio of the width of the second edge gate line to the width of the second gate line segment is b4, wherein b4 satisfies: 2≤b4≤3.

[0015] According to some embodiments of the present invention, the minimum distance between the first edge grid line and the edge of the battery cell body in the second direction is L3, wherein L3 satisfies: 0.3mm≤L3≤1mm; and / or the minimum distance between the second edge grid line and the edge of the battery cell body in the second direction is L4, wherein L4 satisfies: 0.3mm≤L4≤1mm.

[0016] According to some embodiments of the present invention, the minimum distance between the first edge gate line and the one end of the second gate line is L5, wherein L5 satisfies: 0.2mm≤L5≤1mm; and / or, the distance between the second edge gate line and the other end of the first gate line is L6, wherein L6 satisfies: 0.2mm≤L6≤1mm.

[0017] According to some embodiments of the present invention, the spacing between the first grid line and the adjacent second grid line is d1, wherein d1 satisfies: 0.3 mm≤d1≤1 mm.

[0018] According to some embodiments of the present invention, the spacing between two adjacent first grid lines is d2, wherein d2 satisfies: 0.6mm≤d2≤2mm; the spacing between two adjacent second grid lines is d3, wherein d3 satisfies: 0.6mm≤d3≤2mm.

[0019] According to the second aspect of the present invention, the battery string comprises: a plurality of battery cells, wherein the battery cells are the battery cells according to the first aspect; and a plurality of interconnecting structures, through which two adjacent battery cells are electrically connected.

[0020] The photovoltaic assembly according to the third aspect of the present invention comprises the battery cell according to the first aspect, or the battery string according to the second aspect.

[0021] The photovoltaic power generation system according to the fourth aspect of the utility model comprises the battery cell according to the first aspect, or the battery string according to the second aspect, or the photovoltaic module according to the third aspect.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0024] Figure 1 is a schematic diagram of a battery cell according to an embodiment of the utility model;

[0025] Figure 2 is a schematic diagram of a battery cell according to an embodiment of the utility model, wherein an adhesive is shown on the battery cell;

[0026] Figure 3It is a partial schematic diagram of a battery string according to an embodiment of the utility model.

[0027] Reference numerals:

[0028] 100, battery cell; 200, battery string;

[0029] 1. Battery cell body;

[0030] 2. First edge grid line; 3. Second edge grid line;

[0031] 4. first grid line; 41. first grid line segment; 411. first disconnection port; 42. first guide grid line;

[0032] 5. second grid line; 51. second grid line segment; 511. second disconnection port; 52. second guide grid line;

[0033] 6. Interconnection structure; 61. First interconnection structure; 611. First edge interconnection structure;

[0034] 62. A second interconnection structure; 621. A second edge interconnection structure;

[0035] 7. Adhesive member; 8. First connection reinforcement member; 9. Second connection reinforcement member. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figure 1-Figure 3 A battery cell 100 according to an embodiment of the first aspect of the utility model is described.

[0037] like Figure 1 and Figure 2 As shown, a cell 100 according to the first embodiment of the utility model comprises a cell body 1, a first edge grid line 2, a second edge grid line 3, a plurality of first grid lines 4 and a plurality of second grid lines 5. In the description of the utility model, "plurality" means two or more.

[0038] Specifically, the first edge grid line 2 and the second edge grid line 3 are arranged on one side of the thickness direction of the battery cell body 1, and the first edge grid line 2 and the second edge grid line 3 are arranged along a first direction (for example, Figure 1 The first edge grid line 2 and the second edge grid line 3 are respectively arranged on the battery cell body 1 along the second direction (for example, Figure 1The first and second directions are perpendicular to each other. The first grid lines 4 and the second grid lines 5 are arranged on one side of the thickness direction of the battery cell body 1, and a plurality of first grid lines 4 and a plurality of second grid lines 5 are alternately arranged along the first direction. The polarities of the first grid lines 4 and the second grid lines 5 are opposite. One end of the plurality of first grid lines 4 is connected to the first edge grid lines 2, and the other end of the plurality of first grid lines 4 is spaced apart from the second edge grid lines 3. One end of the plurality of second grid lines 5 is spaced apart from the first edge grid lines 2, and the other end of the plurality of second grid lines 5 is connected to the second edge grid lines 3.

[0039] For example, in Figure 1 and Figure 2 In the example, a plurality of first grid lines 4 and a plurality of second grid lines 5 are alternately arranged in the up-down direction, the first grid lines 4 and the second grid lines 5 are both extended in the left-right direction, the first edge grid line 2 is located on the left side of the plurality of first grid lines 4, and the second edge grid line 3 is located on the right side of the plurality of first grid lines 4. The first grid line 4 and the second grid line 5 have opposite polarities, which can be understood as follows: when the first grid line 4 is a positive grid line, the second grid line 5 is a negative grid line; when the first grid line 4 is a negative grid line, the second grid line 5 is a positive grid line. A plurality of first grid lines 4 and the second grid line 5 are located between the first edge grid line 2 and the second edge grid line 3, the first edge grid line 2 and the left ends of the plurality of first grid lines 4 are respectively connected, the first edge grid line 2 and the left ends of the plurality of second grid lines 5 are both spaced apart, the second edge grid line 3 and the right ends of the plurality of first grid lines 4 are both spaced apart, and the plurality of second edge grid lines 3 and the right ends of the plurality of second grid lines 5 are both connected.

[0040] Reference Figure 1 and Figure 2 The first gate line 4 includes a plurality of first gate line segments 41 arranged at intervals along the second direction, two adjacent first gate line segments 41 of at least one of the plurality of first gate lines 4 adjacent to the first edge gate line 2 are connected to each other to form a first guide gate line 42, and a width of at least a portion of the first guide gate line 42 is greater than a width of the first gate line segment 41. The second gate line 5 includes a plurality of second gate line segments 51 arranged at intervals along the second direction, two adjacent second gate line segments 51 of at least one of the plurality of second gate lines 5 adjacent to the second edge gate line 3 are connected to each other to form a second guide gate line 52, and a width of at least a portion of the second guide gate line 52 is greater than a width of the second gate line segment 51.

[0041] For example, in Figure 1 and Figure 2 In the example, a plurality of first gate line segments 41 are arranged at intervals along the left-right direction, and a plurality of second gate line segments 51 are arranged at intervals along the left-right direction. Two adjacent first gate line segments 41 adjacent to the first edge gate line 2 of at least one first gate line 4 among the plurality of first gate lines 4 are connected as a whole. Two adjacent second gate line segments 51 adjacent to the second edge gate line 3 of at least one second gate line 5 among the plurality of second gate lines 5 are connected as a whole.

[0042] Combination Figure 3 When the battery cell 100 is used in a battery string 200, the plurality of battery cells 100 are sequentially connected to form a battery string 200 through a plurality of interconnection structures 6, such as welding strips. The plurality of interconnection structures 6 include a plurality of first interconnection structures 61 and a plurality of second interconnection structures 62. The plurality of first interconnection structures 61 are insulated and connected to the plurality of first grid lines 4, respectively. The plurality of first interconnection structures 61 are spaced apart from the ends of the corresponding plurality of first grid line segments 41, respectively. The plurality of first interconnection structures 61 are electrically connected to the plurality of second grid lines 5, respectively. The plurality of second interconnection structures 62 are insulated and connected to the plurality of second grid lines 5, respectively. The plurality of second interconnection structures 62 are spaced apart from the ends of the corresponding plurality of second grid line segments 51, respectively. The plurality of second interconnection structures 62 are electrically connected to the plurality of first grid lines 4. The second interconnection structures 62 adjacent to the first edge grid line 2 among the plurality of second interconnection structures 62 are electrically connected to the corresponding plurality of first grid line segments 41 (i.e., the plurality of first grid line segments 41 opposite to the first edge grid line 2 above and below) and the first guide grid line 42. The first interconnection structure 61 adjacent to the second edge gate line 3 among the plurality of first interconnection structures 61 is electrically connected to the adjacent second edge gate line 3 and the corresponding plurality of second gate line segments 51 (i.e., the plurality of second gate line segments 51 opposite to the adjacent second edge gate line 3 above and below) and the second guide gate line 52 respectively.

[0043] Thus, by arranging a plurality of first grid line segments 41 and second grid line segments 51, the insulation connection between the first grid line 4 and the first interconnection structure 61 and the insulation connection between the second grid line 5 and the second interconnection structure 62 can be realized, and the reliability of use of the battery cell 100 is improved. And there is no need to adopt other structural parts or insulating glue to realize insulation, reduce the amount of insulating glue, reduce costs, simplify the structure of the battery cell 100, be convenient for production and processing, and have low production costs. In addition, the material consumption of the first grid line 4 and the second grid line 5 is reduced, thereby reducing the printing cost of the first grid line 4 and the second grid line 5, and then reducing the production cost of the battery cell 100. In addition, by arranging the first edge grid line 2 and the second edge grid line 3, the first edge grid line 2 is connected to the plurality of first grid line segments 41 at the leftmost end of the plurality of first grid lines 4, and the first edge grid line 2 can collect the current on the plurality of first grid line segments 41, and the second edge grid line 3 is connected to the plurality of second grid line segments 51 at the rightmost end of the plurality of second grid lines 5, and the second edge grid line 3 can collect the current on the plurality of second grid line segments 51 to avoid current loss.

[0044] For example, combined with Figure 3, the second interconnection structure 62 adjacent to the first edge grid line 2 can collect the current converted on the corresponding multiple first grid line segments 41, and the current of the multiple first grid line segments 41 connected to the first edge grid line 2 can be collected to the first guide grid line 42 through the first edge grid line 2, and then guided to the above-mentioned second interconnection structure 62 through the first guide grid line 42, so as to facilitate the normal use of the battery string 200. Similarly, the first interconnection structure 61 adjacent to the second edge grid line 3 can collect the current converted on the corresponding multiple second grid line segments 51, and the current of the multiple second grid line segments 51 connected to the second edge grid line 3 can be collected to the second guide grid line 52 through the second edge grid line 3, and then guided to the above-mentioned first interconnection structure 61 through the second guide grid line 52. In addition, since the current of the plurality of first grid line segments 41 is led to the second interconnection structure 62 adjacent to the first edge grid line 2 through the first guide grid line 42, the current on the first guide grid line 42 increases. By setting the width of at least a portion of the first guide grid line 42 to be greater than the width of the first grid line segment 41, the resistance can be reduced, which is more conducive to the collection and extraction of the current of the plurality of first grid line segments 41. Similarly, since the current of the plurality of second grid line segments 51 is led to the first interconnection structure 61 adjacent to the second edge grid line 3 through the second guide grid line 52, the current on the second guide grid line 52 increases. By setting the width of at least a portion of the second guide grid line 52 to be greater than the width of the second grid line segment 51, the resistance can be reduced, which is more conducive to the collection and extraction of the current of the plurality of second grid line segments 51, so as to facilitate the normal use of the battery cell 100.

[0045] According to the battery cell 100 of the embodiment of the utility model, by setting the width of at least a portion of the first current guiding grid line 42 to be greater than the width of the first grid line segment 41, the resistance can be reduced, which is more conducive to the collection and extraction of the current of the plurality of first grid line segments 41. Similarly, since the current of the plurality of second grid line segments 51 is extracted to the first interconnection structure 61 adjacent to the second edge grid line 3 through the second current guiding grid line 52, the current on the second current guiding grid line 52 increases. By setting the width of at least a portion of the second current guiding grid line 52 to be greater than the width of the second grid line segment 51, the resistance can be reduced, which is more conducive to the collection and extraction of the current of the plurality of second grid line segments 51, so as to facilitate the normal use of the battery cell 100.

[0046] According to some embodiments of the present invention, Figure 1 and Figure 2 , the ratio of the width of at least a portion of the first guide gate line 42 to the width of the first gate line segment 41 is b1, wherein b1 satisfies: 2≤b1≤3; and / or, the ratio of the width of at least a portion of the second guide gate line 52 to the width of the second gate line segment 51 is b2, wherein b2 satisfies: 2≤b2≤3.

[0047] For example, in Figure 2In the example, there are two first flow-guiding gate lines 42, and six first gate line segments 41 connected to the first edge gate line 2. Each first flow-guiding gate line 42 can collect three corresponding adjacent first gate line segments 41 (for example, Figure 2 The current on the two first gate line segments 41 above the first guide gate line 42 located near the upper edge of the battery cell 100 and the one first gate line segment 41 below the first guide gate line 42 can be guided to the corresponding second interconnection structure 62 through the multiple first guide gate lines 42. Figure 2 As shown, there are two second guide gate lines 52, and there are six second gate line segments 51 connected to the second edge gate line 3. Each second guide gate line 52 can collect currents on the corresponding three second gate line segments 51, so that the currents on multiple second gate line segments 51 can be guided to the corresponding first interconnection structure 61 through multiple second guide gate lines 52.

[0048] Therefore, by setting the ratio of the width of the above-mentioned at least a part of the first guide gate line 42 (that is, the thickened part of the first guide gate line 42) to the width of the first gate line segment 41 to satisfy: 2≤b1≤3, the ratio of the width of the above-mentioned at least a part of the second guide gate line 52 (that is, the thickened part of the second guide gate line 52) to the width of the second gate line segment 51 satisfies: 2≤b2≤3, the width settings of the thickened part of the first guide gate line 42 and the thickened part of the second guide gate line 52 are relatively reasonable, which is beneficial to the collection of currents of the adjacent multiple first gate line segments 41 and multiple second gate line segments 51, and at the same time, it can also avoid the increase in the amount of material caused by the first guide gate line 42 and the second guide gate line 52 being too thick, which is beneficial to the use of the battery cell 100 and can also reduce the production cost of the battery cell 100.

[0049] According to some embodiments of the present invention, Figure 2 A first disconnection opening 411 is defined between two adjacent first gate line segments 41, and multiple first disconnection openings 411 of multiple first gate lines 4 are opposite to each other along the first direction. A second disconnection opening 511 is defined between two adjacent second gate line segments 51, and multiple second disconnection openings 511 of multiple second gate lines 5 are opposite to each other along the first direction.

[0050] For example, in Figure 1 and Figure 2 In the example, the plurality of first disconnected openings 411 of each first gate line 4 are arranged along the second direction (eg, Figure 2The first disconnection openings 411 of each second gate line 5 are arranged in a plurality of rows relative to each other up and down, and the plurality of rows of the first disconnection openings 411 are arranged in a plurality of rows at intervals along the second direction. The second disconnection openings 511 of each second gate line 5 are arranged in a plurality of rows relative to each other up and down, and the plurality of rows of the second disconnection openings 511 and the plurality of rows of the first disconnection openings 411 are arranged alternately along the second direction. Thus, by setting the first disconnection openings 411 and the second disconnection openings 511, the plurality of first interconnection structural members 61 can be arranged at the corresponding plurality of first disconnection openings 411 to achieve an insulated connection with the plurality of first gate lines 4, and the plurality of second interconnection structural members 62 can be arranged at the corresponding plurality of second disconnection openings 511 to achieve an insulated connection with the plurality of second gate lines 5, without the need to adopt other structures for insulation, which is conducive to the connection between the battery cell 100 and the interconnection structural member 6.

[0051] Optionally, one end of the above-mentioned at least a portion of the first guide grid line 42 is connected to the first edge grid line 2, and the other end of the above-mentioned at least a portion of the first guide grid line 42 extends to a position opposite to the second disconnection opening 511 along the first direction. And / or, one end of the above-mentioned at least a portion of the second guide grid line 52 is connected to the second edge grid line 3, and the other end of the above-mentioned at least a portion of the second guide grid line 52 extends to a position opposite to the first disconnection opening 411 along the first direction.

[0052] For example, in Figure 2 In the example of FIG. 4 , the left end of the thickened portion of the first guide grid line 42 is connected to the first edge grid line 2, and the right end of the thickened portion of the first guide grid line 42 extends rightward to a position vertically opposite to the second opening 511. The right end of the thickened portion of the second guide grid line 52 is connected to the second edge grid line 3, and the left end of the thickened portion of the second guide grid line 52 extends leftward to a position vertically opposite to the first opening 411. Figure 2 As shown, the other end of the first guide grid line 42 extends to a position opposite to the second disconnection opening 511 adjacent to the first edge grid line 2 along the first direction, and the other end of the second guide grid line 52 extends to a position opposite to the first disconnection opening 411 adjacent to the second edge grid line 3 along the first direction. Of course, the other end of the first guide grid line 42 may also extend to a position opposite to other second disconnection openings 511 along the first direction, and the other end of the second guide grid line 52 may also extend to a position opposite to other first disconnection openings 411 along the first direction.

[0053] With such arrangement, the plurality of first grid line segments 41 connected to the first edge grid line 2 can be converged to the first guide grid line 42 through the first edge grid line 2, and then the current is guided to the second interconnection structure 62 connected to the first guide grid line 42 through the first guide grid line 42. That is to say, by extending the first guide grid line 42 to a position opposite to the second disconnection opening 511, the first guide grid line 42 is electrically connected to the second interconnection structure 62 at the corresponding position to lead out the current, so as to realize the series connection between the plurality of battery cells 100. Similarly, the plurality of second grid line segments 51 connected to the second edge grid line 3 can be converged to the second guide grid line 52 through the second edge grid line 3, and then the current is guided to the first interconnection structure 61 connected to the second guide grid line 52 through the second guide grid line 52. That is, by extending the second current guiding wire 52 to a position above and below the first opening 411 , the second current guiding wire 52 is electrically connected to the first interconnection structure 61 at the corresponding position to lead out the current, thereby realizing the series connection between the multiple battery cells 100 .

[0054] According to some embodiments of the present invention, Figure 2 The other end of the first guide grid line 42 extends to a position opposite to the second opening 511 adjacent to the first edge grid line 2 along the first direction. And / or, the other end of the second guide grid line 52 extends to a position opposite to the first opening 411 adjacent to the second edge grid line 3 along the first direction.

[0055] For example, in Figure 2 and Figure 3 In the example, the left end of the thickened portion of the first current guiding grid line 42 is connected to the first edge grid line 2, and the right end of the thickened portion of the first current guiding grid line 42 extends to a position opposite to the second disconnection opening 511 adjacent to the first edge grid line 2 in the up-down direction, that is, the thickened portion of the first current guiding grid line 42 extends to the second interconnection structure 62 adjacent to the first edge grid line 2, so that the width of the first current guiding grid line 42 portion located between the first edge grid line 2 and the second interconnection structure 62 adjacent to the first edge grid line 2 is larger, which is more conducive to the current sinking of the plurality of first grid line segments 41 connected to the first edge grid line 2, and further improves the reliability of the use of the battery cell 100. Moreover, it is also possible to avoid making the length of the thickened portion of the first current guiding grid line 42 too long, thereby increasing the amount of slurry used.

[0056] For example, in Figure 2 and Figure 3In the example, the right end of the thickened portion of the second current guiding grid line 52 is connected to the second edge grid line 3, and the left end of the thickened portion of the second current guiding grid line 52 extends to a position opposite to the first disconnection opening 411 adjacent to the second edge grid line 3 in the up-down direction, that is, the thickened portion of the second current guiding grid line 52 extends to the first interconnection structure 61 adjacent to the second edge grid line 3, so that the width of the second current guiding grid line 52 portion located between the second edge grid line 3 and the first interconnection structure 61 adjacent to the second edge grid line 3 is larger, which is more conducive to the current sinking of the plurality of second grid line segments 51 connected to the second edge grid line 3, and further improves the reliability of the use of the battery cell 100. Moreover, it is also possible to avoid making the length of the thickened portion of the second current guiding grid line 52 too long, thereby increasing the amount of slurry used.

[0057] According to some embodiments of the present invention, the length of the first disconnection opening 411 in the second direction is L1, wherein L1 satisfies: 0.4 mm ≤ L1 ≤ 1.6 mm. And / or, the length of the second disconnection opening 511 in the second direction is L2, wherein L2 satisfies: 0.4 mm ≤ L2 ≤ 1.6 mm. For example, the configuration of the first disconnection opening 411 and the second disconnection opening 511 includes the following situations: First, the length of the first disconnection opening 411 in the second direction is L1 , L1 satisfies: 0.4mm≤L1≤1.6mm, and the length of the second opening 511 is not limited. Second, the length of the second opening 511 in the second direction is L2, and L2 satisfies: 0.4mm≤L2≤1.6mm, and the length of the first opening 411 is not limited. Third, the length of the first opening 411 in the second direction is L1, and the length of the second opening 511 in the second direction is L1, and L1 and L2 respectively satisfy: 0.4mm≤L1≤1.6mm, 0.4mm≤L2≤1.6mm.

[0058] When the length L1 of the first disconnection opening 411 is greater than 0.4 mm, the length of the first disconnection opening 411 is relatively small, so that when a plurality of battery cells 100 are electrically connected through the first interconnection structure 61, the distance between the side of the first interconnection structure 61 and the side of the first grid line 4 corresponding to the first disconnection opening 411 is relatively small, and the first interconnection structure 61 is easily in contact with the adjacent first grid line segment 41, so that the battery string 200 is prone to short circuit, which is not conducive to the normal use of the battery string 200. In addition, the difficulty of assembling the battery cell 100 and the first interconnection structure 61 is increased, and the assembly efficiency of the battery string 200 is reduced. When the length L1 of the first disconnection opening 411 is greater than 1.6 mm, the length of the first disconnection opening 411 is relatively large, shortening the length of the first grid line 4, reducing the occupied area of ​​the first grid line 4 on the battery cell body 1, thereby reducing the utilization of the surface of the battery cell 100, and further reducing the use efficiency of the battery cell 100.

[0059] When the length L2 of the second disconnection opening 511 is greater than 0.4 mm, the length of the second disconnection opening 511 is relatively small, so that when a plurality of battery cells 100 are electrically connected through the second interconnection structure 62, the distance between the side of the second interconnection structure 62 and the side of the second grid line 5 corresponding to the second disconnection opening 511 is relatively small, and the second interconnection structure 62 is easily in contact with the adjacent second grid line segment 51, so that the battery string 200 is prone to short circuit, which is not conducive to the normal use of the battery string 200. In addition, the difficulty of assembling the battery cell 100 and the second interconnection structure 62 is increased, and the assembly efficiency of the battery string 200 is reduced. When the length L2 of the second disconnection opening 511 is greater than 1.6 mm, the length of the second disconnection opening 511 is relatively large, which shortens the length of the second grid line 5, reduces the occupied area of ​​the second grid line 5 on the battery cell body 1, thereby reducing the utilization rate of the surface of the battery cell 100, and further reducing the use efficiency of the battery cell 100.

[0060] Thus, by setting the length L1 of the first disconnection opening 411 in the second direction and the length L2 of the second disconnection opening 511 in the second direction to respectively satisfy: 0.4mm≤L1≤1.6mm, 0.4mm≤L2≤1.6mm, the length of the first disconnection opening 411 and the length of the second disconnection opening 511 are reasonably set, so that when a plurality of battery cells 100 are electrically connected through the interconnection structure 6, a short circuit of the battery string 200 can be avoided, thereby extending the service life of the battery string 200. In addition, the material usage of the first grid line 4 and the second grid line 5 can be reduced while ensuring the occupied area of ​​the first grid line 4 and the second grid line 5, so as to be more conducive to the use of the battery cell 100. In addition, the difficulty of assembling the battery cell 100 and the interconnection structure 6 is reduced, and the assembly efficiency of the battery string 200 is improved.

[0061] According to some embodiments of the present invention, Figure 1 and Figure 2 There are a plurality of first guide grid lines 42, and the plurality of first guide grid lines 42 are arranged at intervals along the first direction. And / or there are a plurality of second guide grid lines 52, and the plurality of second guide grid lines 52 are arranged at intervals along the first direction.

[0062] For example, taking the battery cell 100 as having a length of 182 mm and a width of 91 mm, the first guide grid lines 42 and the second guide grid lines 52 are respectively provided in plurality, and the plurality of first guide grid lines 42 are evenly spaced and arranged along the first direction, and the plurality of second guide grid lines 52 are evenly spaced and arranged along the first direction. Thus, by providing the plurality of first guide grid lines 42 and the plurality of second guide grid lines 52, the currents of the plurality of first grid line segments 41 can flow out through the adjacent first guide grid lines 42, respectively, and the currents of the plurality of second grid line segments 51 can flow out through the adjacent second guide grid lines 52, respectively, and the plurality of first guide grid lines 42 and the plurality of second guide grid lines 52 can respectively assume the role of diversion, thereby being more conducive to the diversion of the currents of the plurality of first grid line segments 41 and the plurality of second grid line segments 51. Moreover, the currents on the first plurality of guide gate lines 42 and the currents on the second plurality of guide gate lines 52 can be made to differ slightly, thereby improving the stability of the photoelectric conversion of the cell 100 and improving the reliability of the cell 100 .

[0063] According to some embodiments of the present invention, the ratio of the width of the first edge gate line 2 to the width of the first gate line segment 41 is b3, where b3 satisfies: 2≤b3≤3. And / or, the ratio of the width of the second edge gate line 3 to the width of the second gate line segment 51 is b4, where b4 satisfies: 2≤b4≤3.

[0064] When the battery cell 100 is used in the battery string 200, the current collected and converted on the multiple first grid line segments 41 connected to the first edge grid line 2 flows to the second interconnection structure 62 through the first edge grid line 2 and the corresponding first guide grid line 42, and the current collected and converted on the multiple second grid line segments 51 connected to the second edge grid line 3 flows to the first interconnection structure 61 through the second edge grid line 3 and the corresponding second guide grid line 52. Therefore, by setting the width of the first edge grid line 2 to be 2 to 3 times the width of the first grid line segment 41, and the width of the second edge grid line 3 to be 2 to 3 times the width of the second grid line segment 51, it is beneficial to the current transmission between the multiple first grid line segments 41 and the first edge grid line 2, and it is also beneficial to the current transmission between the multiple second grid line segments 51 and the second edge grid line 3, so as to ensure the normal use of the battery cell 100. In addition, it can also avoid the increase in the amount of material used for the grid line caused by the excessive width of the first grid line 4 and the width of the second edge grid line 3, thereby reducing the production cost of the battery cell 100.

[0065] According to some embodiments of the present invention, Figure 2, the minimum distance between the first edge grid line 2 and the edge of the cell body 1 in the second direction is L3, where L3 satisfies: 0.3mm≤L3≤1mm. And / or, the minimum distance between the second edge grid line 3 and the edge of the cell body 1 in the second direction is L4, where L4 satisfies: 0.3mm≤L4≤1mm.

[0066] For example, in Figure 2 In the example above, L3 It refers to the straight-line distance between the first edge grid line 2 and the left edge of the cell body 1 along the second direction, and the above L4 refers to the straight-line distance between the second edge grid line 3 and the right edge of the cell body 1 along the second direction. When the minimum distance L3 between the first edge grid line 2 and the edge of the cell body 1 in the second direction is less than 0.3 mm, the distance between the first edge grid line 2 and the edge of the cell body 1 is small. When printing the first edge grid line 2, the first edge grid line 2 is easily offset to the outside of the cell body 1, which is not conducive to the processing of the cell 100. When the minimum distance L3 between the first edge grid line 2 and the edge of the cell body 1 in the second direction is greater than 1 mm, the distance between the first edge grid line 2 and the edge of the cell body 1 is too large, the utilization rate of the surface of the cell body 1 is reduced, thereby reducing the photoelectric conversion capacity of the cell 100, and further reducing the performance of the cell 100.

[0067] Therefore, by setting the minimum distance between the first edge grid line 2 and the edge of the battery cell body 1 in the second direction to L3 satisfying 0.3mm≤L3≤1mm, and the minimum distance between the second edge grid line 3 and the edge of the battery cell body 1 in the second direction to L4 satisfying 0.3mm≤L4≤1mm, the position of the first edge grid line 2 is reasonably set, and the position of the second edge grid line 3 is reasonably set, which is beneficial to the processing of the battery cell 100 and can also improve the utilization rate of the surface of the battery cell 10010, which is beneficial to the photoelectric conversion of the battery cell 100, and thus is beneficial to the use of the battery cell 100.

[0068] According to some embodiments of the present invention, the minimum distance between the first edge grid line 2 and the above-mentioned one end of the second grid line 5 is L5, wherein L5 satisfies: 0.2mm≤L5≤1mm. And / or, the distance between the second edge grid line 3 and the above-mentioned other end of the first grid line 4 is L6, wherein L6 satisfies: 0.2mm≤L6≤1mm.

[0069] For example, in Figure 2In the example, the distance between the first edge grid line 2 and the left end of the second grid line segment 51 close to the first edge grid line 2 is L5, and the distance between the second edge grid line 3 and the right end of the first grid line segment 41 close to the second edge grid line 3 is L6. When the distance between the first edge grid line 2 and the end of the second grid line segment 51 away from the second edge grid line 3 is less than 0.2 mm, the distance between the above-mentioned one end of the plurality of second grid line segments 51 and the first edge grid line 2 is small, so that during the use of the battery cell 100, the left ends of the plurality of second grid lines 5 and the first edge grid line 2 are easily affected by each other and short-circuited, which is not conducive to the long-term normal use of the battery cell 100. When the distance between the first edge grid line 2 and the end of the second grid line segment 51 away from the second edge grid line 3 is greater than 1 mm, the distance between the above-mentioned one end of the plurality of second grid line segments 51 and the first edge grid line 2 is large, thereby reducing the occupied area of ​​the second grid line 5 on the surface of the battery cell body 1, reducing the surface utilization rate of the battery cell body 1, and further reducing the photoelectric conversion capacity of the battery cell 100.

[0070] Thus, by setting the minimum distance L5 between the first edge grid line 2 and the above-mentioned one end of the second grid line 5 to satisfy 0.2mm≤L5≤1mm, the distance between the plurality of second grid line segments 51 close to the first edge grid line 2 and the first edge grid line 2 is set reasonably, thereby avoiding the plurality of second grid line segments 51 and the first edge grid line 2 from affecting each other and causing a short circuit during the use of the battery cell 100, thereby allowing the battery cell 100 to be used normally for a long time. In addition, while ensuring that the plurality of second grid line segments 51 and the first edge grid line 2 can avoid affecting each other and causing a short circuit, the area occupied by the second grid line segments 51 on the surface of the battery cell body 1 is increased, thereby improving the surface utilization rate of the battery cell body 1, thereby improving the photoelectric conversion capacity of the battery cell 100.

[0071] For example, when the distance between the second edge grid line 3 and the end of the plurality of first grid line segments 41 away from the first edge grid line 2 is less than 0.2 mm, the distance between the right end of the plurality of first grid line segments 41 and the second edge grid line 3 is small, so that during the use of the battery cell 100, the plurality of first grid line segments 41 and the second edge grid line 3 are easily affected by each other and short-circuited, which is not conducive to the long-term normal use of the battery cell 100. When the distance between the second edge grid line 3 and the end of the plurality of first grid line segments 41 away from the first edge grid line 2 is greater than 0.1 mm, the distance between the right end of the plurality of first grid line segments 41 and the second edge grid line 3 is large, thereby reducing the occupied area of ​​the first grid line 4 on the surface of the battery cell 100, reducing the surface utilization rate of the battery cell body 1, and further reducing the photoelectric conversion capacity of the battery cell 100.

[0072] Thus, by setting the distance L6 between the second edge grid line 3 and the other end of the first grid line 4 to satisfy 0.2mm≤L6≤1mm, the distance between one end of the plurality of first grid lines 4 close to the second edge grid line 3 and the second edge grid line 3 is reasonably set, thereby avoiding the plurality of first grid lines 4 and the second edge grid lines 3 from affecting each other and causing a short circuit during the use of the battery cell 100, thereby allowing the battery cell 100 to be used normally for a long time. In addition, while ensuring that the plurality of first grid lines 4 and the second edge grid lines 3 can avoid affecting each other and causing a short circuit, the occupied area of ​​the first grid lines 4 on the surface of the battery cell body 1 is increased, thereby improving the surface utilization rate of the battery cell body 1, thereby improving the photoelectric conversion capacity of the battery cell 100.

[0073] According to some embodiments of the present invention, the spacing between a first grid line 4 and an adjacent second grid line 5 is d1, wherein d1 satisfies: 0.3 mm≤d1≤1 mm.

[0074] For example, in Figure 2 In the example, the minimum spacing between the first gate line 4 and the adjacent second gate line 5 in the up-down direction is d1. When the spacing d1 between the first gate line 4 and the adjacent second gate line 5 is less than 0.3 mm, the spacing between the first gate line 4 and the second gate line 5 is small, so that during the use of the battery cell 100, the current on the first gate line 4 and the second gate line 5 are easily affected by each other to cause a short circuit, and the printing difficulty of the first gate line 4 and the second gate line 5 is increased, thereby increasing the processing difficulty of the battery cell 100. When the spacing d1 between the first gate line 4 and the adjacent second gate line 5 is greater than 1 mm, the spacing between the first gate line 4 and the second gate line 5 is large, reducing the number of the first gate line 4 and the second gate line 5 on the battery cell body 1, thereby reducing the surface utilization rate of the battery cell 100, and also weakening the photoelectric conversion ability of the battery cell 100, thereby reducing the performance of the battery cell 100.

[0075] Therefore, by setting the spacing d1 between the first grid line 4 and the adjacent second grid line 5 to satisfy: 0.3mm≤d1≤1mm, the distance between the first grid line 4 and the second grid line 5 is reasonably set, thereby avoiding the short circuit between the first grid line 4 and the second grid line 5, and reducing the processing difficulty of the battery cell 100. In addition, the number of the arrangement of the plurality of first grid lines 4 and the plurality of second grid lines 5 is rationalized, thereby improving the surface utilization rate of the battery cell body 1, improving the photoelectric conversion capacity of the battery cell 100, and thus improving the performance of the battery cell 100.

[0076] According to some embodiments of the present invention, the spacing between two adjacent first grid lines 4 is d2, wherein d2 satisfies: 0.6mm≤d2≤2mm; the spacing between two adjacent second grid lines 5 is d3, wherein d3 satisfies: 0.6mm≤d3≤2mm.

[0077] For example, in Figure 2 In the example, the minimum distance between two adjacent first grid lines 4 along the up-down direction is d2, and the minimum distance between two adjacent second grid lines 5 along the up-down direction is d3. When the spacing d2 between two adjacent first grid lines 4 is less than 0.6 mm, the spacing between two adjacent first grid lines 4 is small, which makes it inconvenient to set the first grid line 4 between two adjacent second grid lines 5, increasing the production difficulty of the battery cell 100. When the spacing d2 between two adjacent first grid lines 4 is greater than 2 mm, the spacing between two adjacent first grid lines 4 is large, which reduces the number of multiple first grid lines 4 arranged on the battery cell body 1, thereby reducing the surface area utilization rate of the battery cell 100. When the spacing d2 between two adjacent second grid lines 5 is less than 0.6 mm, the spacing between two adjacent second grid lines 5 is small, which makes it inconvenient to set the first grid line 4 between two adjacent second grid lines 5, increasing the production difficulty of the battery cell 100. When the interval d2 between two adjacent second grid lines 5 is greater than 2 mm, the interval between two adjacent second grid lines 5 is relatively large, which reduces the number of second grid lines 5 arranged on the cell body 1 , thereby reducing the area utilization of the cell 100 .

[0078] Thus, by setting the spacing d2 between two adjacent first grid lines 4 and the spacing d3 between two adjacent second grid lines 5 to respectively satisfy: 0.6mm≤d2≤2mm, 0.6mm≤d3≤2mm, the spacing between two adjacent first grid lines 4 and the spacing between two adjacent second grid lines 5 are reasonably set, which reduces the production difficulty of the battery cell 100, thereby improving the production efficiency of the battery cell 100. In addition, the number of arrangement of multiple first grid lines 4 and multiple second grid lines 5 is rationalized, thereby improving the surface utilization rate of the battery cell body 1, improving the photoelectric conversion capacity of the battery cell 100, and thus improving the use performance of the battery cell 100.

[0079] According to the battery string 200 of the second embodiment of the utility model, Figure 3 , including multiple battery cells 100 and multiple interconnection structures 6, the battery cell 100 is the battery cell 100 according to the above-mentioned first aspect embodiment, and two adjacent battery cells 100 are electrically connected through multiple interconnection structures 6.

[0080] For example, in Figure 3In the example, the plurality of interconnecting structural members 6 are arranged at intervals along the second direction. By adopting the above-mentioned battery cell 100, the reliability of the battery string 200 is improved, which is conducive to the long-term use of the battery string 200. In addition, the plurality of battery cells 100 can be sequentially connected to form a battery string 200 through the plurality of interconnecting structural members 6. The first guide grid lines 42 and the second guide grid lines 52 of the battery cells 100 are conducive to the sinking of the current on the plurality of first grid lines 4 and the plurality of second grid lines 5, so as to facilitate the long-term stable use of the battery string 200.

[0081] According to some embodiments of the present invention, referring to Figure 3 The plurality of interconnection structures 6 include a plurality of first interconnection structures 61 and a plurality of second interconnection structures 62 .

[0082] Specifically, the first interconnecting structures 61 are respectively insulated and connected to the plurality of first grid lines 4 of the battery cell 100, and are electrically connected to the plurality of second grid lines 5 of the battery cell 100. The plurality of first interconnecting structures 61 include a first edge interconnecting structure 611. The first edge interconnecting structure 611 is opposite to the plurality of first disconnected openings 411 adjacent to the first edge grid lines 2 of the battery cell 100, and the first edge interconnecting structure 611 is electrically connected to the second connection grid lines. The second interconnecting structures 62 are respectively insulated and connected to the second grid lines 5, and are electrically connected to the first grid lines 4. The plurality of second interconnecting structures 62 include a second edge interconnecting structure 621. The second edge interconnecting structure 621 is opposite to the plurality of second disconnected openings 511 adjacent to the second edge grid lines 3 of the battery cell 100, and the second edge interconnecting structure 621 is electrically connected to the first connection grid lines.

[0083] For example, in Figure 3 In the example, the interconnection structure 6 extends along the first direction, and the plurality of first interconnection structures 61 and the plurality of second interconnection structures 62 are alternately arranged in the second direction. The plurality of first interconnection structures 61 adjacent to the first edge grid line 2 is the first edge interconnection structure 611, and the plurality of second interconnection structures 62 adjacent to the second edge grid line 3 is the second edge interconnection structure 621. The first edge interconnection structure 611 is insulated and connected to the corresponding first guide grid line 42 by an insulating glue, and at least two adhesive members 7 are provided between each first interconnection structure 61 and the battery cell 100, and the adhesive member 7 can be set as an adhesive glue, and the at least two adhesive members 7 are respectively located on the battery cell 100 along the first direction and on the first grid line 4 or the second grid line 5 close to the edge of the battery cell 100. The second edge interconnection structure 621 is insulated and connected to the corresponding second guide grid line 52 by insulating glue. At least two adhesive members 7 are also provided between each second interconnection structure 62 and the battery cell 100. The at least two adhesive members 7 are respectively located on the first grid line 4 or the second grid line 5 on the battery cell 100 along the first direction and close to the edge of the battery cell 100.

[0084] With such arrangement, the first interconnection structure 61 can lead out the current of the plurality of second grid lines 51 that are opposite to each other along the first direction, and the second interconnection structure 62 can lead out the current of the plurality of first grid lines 41 that are opposite to each other along the first direction, so as to realize the electrical connection between the plurality of battery cells 100, thereby improving the photoelectric conversion amount of the battery string 200. In addition, by providing the plurality of first disconnection openings 411 and the plurality of second disconnection openings 511, the free ends of the two adjacent first grid lines 41 are separated from the corresponding first interconnection structure 61, and the free ends of the two adjacent second grid lines 51 are separated from the corresponding second interconnection structure 62 to realize the insulated connection between the second interconnection structure 62 and the second grid lines 5, thereby simplifying the structure of the battery cell 100 and facilitating the connection of the plurality of battery cells 100.

[0085] In addition, a first connection reinforcement member 8 is provided between two adjacent second gate line segments 51 adjacent to the first guide gate line 42 along the first direction and the corresponding first edge interconnection structure 611, that is, a first connection reinforcement member 8 is provided between the upper and lower second gate line segments 51 located on the first guide gate line 42 and the first edge interconnection structure 611. A second connection reinforcement member 9 is provided between two adjacent first gate line segments 41 adjacent to the second guide gate line 52 along the first direction and the corresponding second edge interconnection structure 621, that is, a second connection reinforcement member 9 is provided between the upper and lower first gate line segments 41 located on the second guide gate line 52 and the second edge interconnection structure 621. For example, the first connection reinforcement member 8 and the second connection reinforcement member 9 are solder paste members, respectively, thereby increasing the electrical connection strength between the first edge interconnection structure 611 and the corresponding second gate line segment 51, increasing the welding tension, and improving the welding performance, so that the connection between the first edge interconnection structure 611 and the battery cell 100 is more stable. Moreover, the electrical connection strength between the second edge interconnection structure 621 and the corresponding first grid line segment 41 is increased, and the welding performance is improved, so that the connection between the second edge interconnection structure 621 and the battery cell 100 is more stable, thereby improving the reliability of the battery string 200 and improving the performance of the battery string 200. In addition, the first connection reinforcement member 8 and the second connection reinforcement member 9 also reduce the gap between the surface of the battery cell 100 and the corresponding interconnection structure 6, so that the height of the two second grid line segments 51 located on both sides of the first guide grid line 42 is roughly the same as the height of the first guide grid line 42 after the insulating glue is applied, making the welding of the first edge interconnection structure 611 more reliable and stable.

[0086] The photovoltaic module according to the third embodiment of the utility model includes the battery cell 100 according to the first embodiment, or the battery string 200 according to the second embodiment.

[0087] According to the photovoltaic module of the present invention, by adopting the above-mentioned battery sheet 100 or the above-mentioned battery string 200, the production cost of the photovoltaic module is reduced and the power generation of the photovoltaic module is increased.

[0088] The photovoltaic power generation system according to the fourth aspect of the present invention comprises the battery cell 100 according to the first aspect, or the battery string 200 according to the second aspect, or the photovoltaic module according to the third aspect.

[0089] According to the photovoltaic power generation system of the present invention, by adopting the above-mentioned battery cell 100, the above-mentioned battery string 200 or the above-mentioned photovoltaic module, the production cost of the photovoltaic power generation system is reduced, the power generation of the photovoltaic power generation system is increased, and the performance of the photovoltaic power generation system is improved.

[0090] Other structures and operations of the cell sheet 100, the cell string 200, the photovoltaic module and the photovoltaic power generation system according to the embodiment of the utility model are known to those skilled in the art and will not be described in detail here.

[0091] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0092] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0093] 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 spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that: include: Battery cell body; A first edge grid line and a second edge grid line, wherein the first edge grid line and the second edge grid line are arranged on one side of the battery cell body in the thickness direction, the first edge grid line and the second edge grid line extend along a first direction, and the first edge grid line and the second edge grid line are respectively arranged on both sides of the battery cell body along a second direction, and the first direction is perpendicular to the second direction; A plurality of first gate lines and a plurality of second gate lines, wherein the first gate lines and the second gate lines are arranged on the one side in the thickness direction of the battery cell body, the plurality of first gate lines and the plurality of second gate lines are alternately arranged along the first direction, the first gate lines and the second gate lines have opposite polarities, one end of the plurality of first gate lines is connected to the first edge gate lines, the other end of the plurality of first gate lines is spaced apart from the second edge gate lines, one end of the plurality of second gate lines is spaced apart from the first edge gate lines, the other end of the plurality of second gate lines is connected to the second edge gate lines, the first gate line comprises a plurality of first gate line segments arranged along the second direction, two adjacent first gate line segments of at least one of the plurality of first gate lines adjacent to the first edge gate line are connected to each other to form a first guide gate line, and the width of at least a portion of the first guide gate line is greater than the width of the first gate line segment, the second gate line comprises a plurality of second gate line segments arranged along the second direction, two adjacent second gate line segments of at least one of the plurality of second gate lines adjacent to the second edge gate line are connected to each other to form a second guide gate line, and the width of at least a portion of the second guide gate line is greater than the width of the second gate line segment.

2. The battery cell according to claim 1, characterized in that: The ratio of the width of the at least a portion of the first guide gate line to the width of the first gate line segment is b1, wherein b1 satisfies: 2≤b1≤3; and / or The ratio of the width of the at least a portion of the second guide gate line to the width of the second gate line segment is b2, wherein b2 satisfies: 2≤b2≤3.

3. The battery cell according to claim 1, characterized in that: A first break is defined between two adjacent first gate line segments, and the first break of the first gate lines is opposite to each other along the first direction; A second break is defined between two adjacent second gate line segments, and a plurality of second breaks of a plurality of second gate lines are opposite to each other along the first direction; One end of the at least one portion of the first guide gate line is connected to the first edge gate line, and the other end of the at least one portion of the first guide gate line extends to a position opposite to the second opening along the first direction; and / or One end of the at least a portion of the second guide grid line is connected to the second edge grid line, and the other end of the at least a portion of the second guide grid line extends to a position opposite to the first opening along the first direction.

4. The battery cell according to claim 3, characterized in that: The other end of the at least a portion of the first guide grid line extends to a position opposite to the second opening adjacent to the first edge grid line along the first direction; and / or The other end of the at least a portion of the second guide grid line extends to a position opposite to the first opening adjacent to the second edge grid line along the first direction.

5. The battery cell according to claim 3, characterized in that: The length of the first opening in the second direction is L1, wherein L1 satisfies: 0.4 mm ≤ L1 ≤ 1.6 mm; and / or The length of the second opening in the second direction is L2, wherein L2 satisfies: 0.4 mm ≤ L2 ≤ 1.6 mm.

6. The battery cell according to claim 1, characterized in that: There are a plurality of first guide grid lines, and the plurality of first guide grid lines are arranged at intervals along the first direction; and / or There are a plurality of the second guide grid lines, and the plurality of the second guide grid lines are arranged at intervals along the first direction.

7. The battery cell according to claim 1, characterized in that: The ratio of the width of the first edge gate line to the width of the first gate line segment is b3, wherein b3 satisfies: 2≤b3≤3; and / or The ratio of the width of the second edge gate line to the width of the second gate line segment is b4, wherein b4 satisfies: 2≤b4≤3.

8. The battery cell according to claim 1, characterized in that: The minimum distance between the first edge grid line and the edge of the battery cell body in the second direction is L3, wherein L3 satisfies: 0.3mm≤L3≤1mm; and / or The minimum distance between the second edge grid line and the edge of the battery cell body in the second direction is L4, wherein L4 satisfies: 0.3 mm ≤ L4 ≤ 1 mm.

9. The battery cell according to claim 1, characterized in that: The minimum distance between the first edge gate line and the one end of the second gate line is L5, wherein L5 satisfies: 0.2 mm ≤ L5 ≤ 1 mm; and / or The distance between the second edge gate line and the other end of the first gate line is L6, wherein L6 satisfies: 0.2 mm≤L6≤1 mm.

10. The battery cell according to claim 1, characterized in that: The distance between the first gate line and the adjacent second gate line is d1, wherein d1 satisfies: 0.3 mm≤d1≤1 mm.

11. The battery cell according to any one of claims 1 to 10, characterized in that: The distance between two adjacent first gate lines is d2, wherein d2 satisfies: 0.6 mm ≤ d2 ≤ 2 mm; The distance between two adjacent second gate lines is d3, wherein d3 satisfies: 0.6 mm≤d3≤2 mm.

12. A battery string, characterized in that: include: A plurality of battery cells, wherein the battery cells are battery cells according to any one of claims 1 to 11; A plurality of interconnecting structural members, two adjacent battery cells are electrically connected via the plurality of interconnecting structural members.

13. A photovoltaic module, characterized in that: It comprises the battery cell according to any one of claims 1 to 11, or the battery string according to claim 12.

14. A photovoltaic power generation system, characterized in that: It comprises the battery cell according to any one of claims 1 to 11, or the battery string according to claim 12, or the photovoltaic module according to claim 13.

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