Battery cell and photovoltaic power generation module

Abstract

To provide a battery cell and a photovoltaic power generation module.SOLUTION: A photovoltaic power generation module includes a substrate, a main grid, and at least one mark point. The main grid is arranged on a same side of the substrate, and includes at least a first main grid and a second main grid, the first main grid and the second main grid having opposite polarities. The first main grid has a first pad, and the second main grid has a second pad. The first pad and the second pad are arranged sequentially along a straight line parallel to an arrangement direction of the main grid. A distance from a mark point to the first pad is different from a distance from the same mark point to the second pad. Through such a design, the polarity of the corresponding main grid can be determined as positive or negative according to distances from the mark point to different pads, which is conducive to identifying the polarity of the main grid and facilitating electrical connection of battery cells.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to the technical field of photovoltaic devices, and in particular to battery cells and photovoltaic modules. [Background technology]

[0002] A back-contact battery is a battery that has no electrodes on the front side, and the metal grid lines of the positive and negative electrodes are arranged in a cross-finger pattern on the back side of the battery. The grid lines of the positive and negative electrodes are located on the same side of the battery and arranged in a cross-like pattern. This makes it difficult to distinguish the positive main grid and the negative main grid during use, which increases the difficulty of electrical connection of the battery cells. Summary of the Invention [Problem to be solved by the invention]

[0003] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a battery cell and a photovoltaic power generation module to solve the problem of the positive and negative electrodes of the main grid. [Means for solving the problem]

[0004] The present invention provides a battery cell, the battery cell including a substrate, a main grid, and at least one mark point; The main grid is provided on the same side of the substrate, The mark points are provided on the substrate and / or the main grid, The main grid includes at least a first main grid and a second main grid, the first main grid and the second main grid have opposite polarities, the first main grid has a first pad, and the second main grid has a second pad, the first pad and the second pad are sequentially arranged along a straight line parallel to an arrangement direction of the main grids, and the same mark point has a different distance to the first pad and a different distance to the second pad.

[0005] In one possible embodiment, the number of the main grids is an odd number, and adjacent main grids along the arrangement direction of the main grids have opposite polarities.

[0006] In one possible embodiment, the battery cell includes at least two of the mark points.

[0007] In one possible embodiment, the mark points are provided in the main grid.

[0008] In one possible embodiment, two of the main grids located at the outermost sides along an arrangement direction of the main grids are the first main grids, and the main grid adjacent to the first main grids is a second main grid, and the mark points include a first mark point and a second mark point; The first mark point is provided on one of the first main grids, and the second mark point is provided on the second main grid that is not adjacent to the first main grid, and a distance from the first mark point to the corresponding first pad and a distance from the second mark point to the corresponding second pad are different.

[0009] In one possible embodiment, the mark points include a first mark point and a second mark point, the first mark point being provided on the first main grid and the second mark point being provided on the second main grid; The first mark point and the second mark point have different shapes.

[0010] In one possible embodiment, the first main grid and the second main grid are adjacent to each other, and the mark point is located between the first main grid and the second main grid along the arrangement direction of the main grids.

[0011] In one possible embodiment, a is the distance from the mark point to the first main grid, and b is the distance from the mark point to the second main grid, where a≠b.

[0012] In one possible embodiment, a distance a from the mark point to the first main grid satisfies 9 mm≦a≦18 mm, a distance b from the mark point to the second main grid satisfies 9 mm≦b≦18 mm, and / or a difference between the distance a from the mark point to the first main grid and the distance b from the mark point to the second main grid satisfies 1 mm≦|ab|≦9 mm.

[0013] In one possible embodiment, the mark points include a first mark point and a second mark point, the first mark point being located on a side of the second mark point closer to the first main grid, and the second mark point being located on a side of the first mark point closer to the second main grid; The first mark point and the second mark point have different shapes.

[0014] In one possible embodiment, a distance from the mark point to the first pad satisfies 9 mm≦m≦18 mm, and a distance from the mark point to the second pad satisfies 9 mm≦n≦18 mm, and / or If the distance from the mark point to the first pad is m and the distance from the mark point to the second pad is n, then 1 mm≦|mn|≦9 mm is satisfied.

[0015] In one possible embodiment, the area of ​​a single said mark point is between 0.3 square millimeters and 4 square millimeters.

[0016] In one possible embodiment, the shape of the mark point is at least one of a circle, a rectangle, and a triangle.

[0017] In one possible embodiment, the material of the mark points is silver paste.

[0018] The present application further provides a photovoltaic module, the photovoltaic module including a battery cell, the battery cell including a substrate, a main grid and at least one mark point, the main grid being provided on a same side of the substrate, and the mark point being provided on the substrate and / or the main grid; The main grid includes at least a first main grid and a second main grid, the first main grid and the second main grid have opposite polarities, the first main grid has a first pad, and the second main grid has a second pad, the first pad and the second pad are sequentially arranged along a straight line parallel to an arrangement direction of the main grids, and the same mark point has a different distance to the first pad and a different distance to the second pad. Effect of the Invention

[0019] This application discloses a battery cell and a photovoltaic module, the photovoltaic module includes a substrate, a main grid, and at least one mark point, the main grid is provided on the same side of the substrate and includes at least a first main grid and a second main grid, the first main grid and the second main grid have opposite polarities, the first main grid has a first pad, the second main grid has a second pad, the first pad and the second pad are provided in sequence along a straight line parallel to the arrangement direction of the main grids, and the mark point has a different distance to the first pad and a different distance to the second pad. With such a design, it is possible to determine whether the polarity of the corresponding main grid is positive or negative based on the distance from the mark point to the different pad, which is advantageous to identifying the polarity of the main grid and facilitating the electrical connection of the battery cell. [Brief description of the drawings]

[0020] [Figure 1] 1 is a schematic diagram of a first embodiment of a battery cell according to the present application. [Diagram 2] FIG. 2 is a schematic diagram of a second embodiment of a battery cell according to the present application. [Diagram 3] FIG. 13 is a schematic diagram of a third embodiment of a battery cell according to the present application. [Figure 4] FIG. 13 is a schematic diagram of a fourth embodiment of a battery cell according to the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] The embodiments described below with reference to the drawings are illustrative and are intended to illustrate the present invention only and should not be construed as limiting the present invention.

[0022] As shown in FIG. 1, an embodiment of the present application provides a battery cell, which includes a substrate 1, a main grid 2, and at least one mark point 3, and the main grid 2 is provided on the same side of the substrate 1. The mark point 3 may be provided on the substrate 1 and / or the main grid 2. The main grid 2 includes at least a first main grid 21 and a second main grid 22, and the first main grid 21 and the second main grid 22 have opposite polarities, i.e., the first main grid 21 is a positive electrode and the second main grid 22 is a negative electrode, or the first main grid 21 is a negative electrode and the second main grid 22 is a positive electrode. The first main grid 21 has a first pad 211, and the second main grid 22 has a second pad 221, and the first pad 211 and the second pad 221 are sequentially provided along a straight line parallel to the arrangement direction of the main grids 2. The same mark point 3 has a different distance to the first pad 211 and a different distance to the second pad 221 .

[0023] By providing the main grids 2 on the same side of the substrate 1, the battery cell becomes a back-contact battery (IBC battery), the side with the main grids 2 is the back side, and the side without the main grids 2 is the front side. The main feature of the IBC battery is that both the PN junction and the metal contact are on the back side of the battery, and there is no shielding effect of the metal electrode on the front side, so it has a high short-circuit current, and at the same time, the wide grid lines on the back side can be provided to reduce the series resistance, which is favorable for improving the fill factor, and the open-circuit voltage gain due to the front surface field (FSF) and good passivation effect of the battery cell is added. Such a battery cell without shielding on the front side not only has a high conversion efficiency, but also has a more aesthetic appearance, and the full back electrode module is easier to assemble. When used, it can be identified by the mark point 3, and according to the distance from the different main grids 2 to the mark point 3, it can be distinguished whether the corresponding main grids 2 are positive or negative, which is convenient for use, reduces the possibility of the distinction between positive and negative electrodes being unclear, and is favorable for improving product quality and processing accuracy.

[0024] Note that "parallel" here does not mean parallel in an absolute sense, but rather approximately parallel; in the actual processing process, due to factors such as processing accuracy and pad shape, the connection lines between the first pads 211 and the second pads 221 may not be completely parallel to the arrangement direction of the main grid 2; usually, it is sufficient for the first pads 211 and the second pads 221 to be in the same row.

[0025] In one possible embodiment, three to eight pads may be provided on the same main grid 2, and specifically, the number of pads on the same main grid 2 may be three, four, five, six, seven, or eight. Any of the pads provided on the first main grid 21 may be the first pad 211, and among the pads located on the second main grid 22, a pad located in the same row as the first pad 211 may be the second pad 221.

[0026] In one possible embodiment, the number of main grids 2 is an odd number, and adjacent main grids 2 along the arrangement direction of the main grids 2 have opposite polarities.

[0027] The number of main grids 2 may be an odd number, such as 3, 5, 7, 9, 11, 13, etc. Adjacent main grids 2 have opposite polarities, and the main grids 2 with positive polarity and the main grids 2 with negative polarity are arranged alternately. Along the arrangement direction of the main grids 2, the first main grid 2 and the last main grid 2 have the same electrode, and during use, it can be determined by the mark points 3 whether the corresponding main grid 2 is positive or negative, which is convenient for use.

[0028] When the number of main grids 2 of a battery cell is an even number, the positive and negative main grids 2 are arranged alternately, so that the first main grid 2 and the last main grid 2 have opposite polarities, and when the battery cells are electrically connected, the positive and negative poles can be distinguished by chamfering, and when the polarities of the main grids 2 at the corresponding positions of adjacent battery cells are different, one of the battery cells can be rotated 180°. In a battery cell with an odd number of main grids 2, the polarity of the first main grid 2 and the last main grid 2 are the same, and even if rotated 180°, the polarity of the main grid 2 at the corresponding position does not change. Therefore, it is necessary to determine the positive and negative poles of the main grids 2. In the technical solution of the embodiment of the present application, the mark points 3 are provided on the battery cells, so that it is possible to distinguish whether the polarity corresponding to the main grid 2 is positive or negative, and thus electrical connection is made based on the polarity of the corresponding main grid 2, thereby improving the accuracy of electrical connection, improving product quality, and better meeting actual usage needs.

[0029] As shown in FIG. 1, in one possible embodiment, the battery cell includes at least two mark points 3.

[0030] The number of mark points 3 may be two, three, four, five, six, seven or more. By providing multiple mark points 3, the polarity of the main grid 2 can be more easily distinguished. Furthermore, if an individual mark point 3 is damaged and cannot be identified, it can be identified by the other mark points 3. This is advantageous in reducing the possibility that the polarity of the main grid 2 of the battery cell cannot be identified due to damage to the mark points 3, and is advantageous in improving the processing efficiency and processing quality of the battery cell.

[0031] As shown in FIG. 1, in one possible embodiment, the mark point 3 is provided on the main grid 2, and when multiple mark points 3 are provided on the battery cell, each mark point 3 may be provided on the first main grid 21 and the second main grid 22, respectively.

[0032] By providing the mark point 3 on the main grid 2, the possibility of the mark point 3 coming into contact with multiple main grids 2 and / or sub-grids 4 at the same time can be reduced. If the mark point 3 comes into contact with multiple main grids 2 and / or sub-grids 4 at the same time, it is likely to cause a situation such as a short circuit in the battery cell, which will affect the normal use of the battery cell and pose a safety risk.

[0033] Each mark point 3 can be used to mark a positive electrode or a negative electrode, and the distance from the mark point 3 to the corresponding pad of the main grid 2 varies according to the polarity of the main grid 2. For example, the distance from the mark point 3 on the positive main grid 2 to the corresponding pad of the main grid 2 is L1, and the distance from the mark point 3 on the negative main grid 2 to the corresponding pad of the main grid 2 is L2, where L1 ≠ L2. During use, the distances from the mark points 3 to the corresponding pads of the main grid 2 can be measured, and the different distances from the mark points 3 to the corresponding pads of the main grid 2 can be used to identify the main grids 2, and the polarity of the main grid 2 can be known, which is convenient for the electrical connection of the battery cells and more meets the actual needs of use.

[0034] In one possible embodiment, the mark point 3 may include a first mark point 31 and a second mark point 32, the first mark point 31 is provided on the first main grid 21, and the second mark point 32 is provided on the second main grid 22. One positive main grid is selected as the first main grid 21, and one negative main grid is selected as the second main grid 22. The distance from the mark point 3 located on the positive main grid to the pad of the corresponding main grid 2 can be preset to be greater than the distance from the mark point 3 located on the negative main grid to the pad of the corresponding main grid 2. During use, the distances from the mark point 3 to the pads of the corresponding main grid 2 can be measured and compared. The longer the distance, the more the positive main grid, and the shorter the distance, the more the negative main grid. Thus, the polarity of the corresponding main grid 2 can be known, and the polarity information of the main grid 2 of the battery cell can be grasped, which is convenient for use.

[0035] As shown in FIG. 1, in one possible embodiment, the two main grids 2 located at the outermost positions along the arrangement direction of the main grids 2 are a first main grid 21, and the main grid 2 adjacent to the first main grid 21 is a second main grid 22, the mark points 3 include a first mark point 31 and a second mark point 32, the first mark point 31 is provided on one of the first main grids 21, and the second mark point 32 is provided on a second main grid 22 that is not adjacent to the first main grid 21, the distance from the first mark point 31 to the corresponding first pad 211 of the first main grid 21 is m, and the distance from the second mark point 32 to the corresponding second pad 221 of the second main grid 22 is n, where m ≠ n.

[0036] During identification, it is possible to identify whether the corresponding main grid 2 is the first main grid 21 or the second main grid 22 according to the distances from the first mark point 31 and the second mark point 32 to the corresponding pads, thereby knowing the polarity of the main grid 2. Since the main grids 2 with positive polarity and the main grids 2 with negative polarity of the battery cells are arranged alternately, it is possible to obtain the polarity arrangement rule of the main grids 2 of the battery cells, thereby knowing whether the main grid 2 is positive or negative. The first main grid 21 and the second main grid 22 are provided with the first mark point 31 and the second mark point 32, respectively, and have different polarities, so that it is possible to identify whether the corresponding main grid 2 is positive or negative based on the first mark point 31 and the second mark point 32, which is convenient to use.

[0037] With this design, the first mark point 31 and the second mark point 32 are provided at the corresponding two ends of the battery cell, respectively, which not only reduces the possibility of the first mark point 31 and the second mark point 32 being damaged at the same time, but also enables the polarity of the main grid 2 to be identified from both ends, which is advantageous to improving the accuracy of identification.

[0038] As shown in FIG. 1, in one possible embodiment, the number of main grids 2 is an odd number, and along the arrangement direction of the main grids 2, the first main grid 2 is the first main grid 21, the penultimate main grid 2 is the second main grid 22, the first mark point 31 is provided on the first main grid 21, and the second mark point 32 is provided on the second main grid 22.

[0039] With this design, the polarities of the first main grid 21 and the second main grid 22 at the front and rear positions can be determined, and since the main grids 2 of the battery cells are arranged alternately according to positive and negative poles, along the arrangement direction of the main grids 2, the polarity of the first main grid 2 and the polarity of the last main grid 2 are the same, and if the first main grid 2 is positive, the last main grid 2 is also positive, and the second main grid 2 and the penultimate main grid 2 are negative. If the first main grid 2 is negative, the last main grid 2 is also negative, and the second main grid 2 and the penultimate main grid 2 are positive. Therefore, by providing mark points 3 on the first main grid 2 and the penultimate main grid 2, respectively, the main grids 2 of different polarities can be marked. During identification, the main grids 2 of different polarities can be identified by the mark points 3, and the information of the positive main grid and the negative main grid can be obtained simultaneously, which is advantageous in distinguishing whether the corresponding main grid 2 is positive or negative, and the accuracy of identification can be improved, which is more in line with actual usage needs.

[0040] 2, in one possible embodiment, the first main grid 21 and the second main grid 22 are adjacent to each other, and along the arrangement direction of the main grids 2, a battery cell includes one mark point 3, which is located between the first main grid 21 and the second main grid 22. The distance from the mark point 3 to the first pad 211 of the first main grid 21 is m, and the distance from the mark point 3 to the second pad 221 of the second main grid 22 is n, where m≠n.

[0041] With this design, the polarity of adjacent main grids 2 can be distinguished by one mark point 3, and since the number of main grids 2 in a battery cell is odd, and the positive and negative main grids 2 are alternately arranged, after checking the polarity of two adjacent main grids 2, the polarity of the other main grids 2 can also be checked according to the arrangement rule, so that it can be determined whether each main grid 2 is positive or negative. With this design, the number of mark points 3 can be reduced, thereby reducing costs and improving production efficiency, and better meeting actual usage needs.

[0042] As shown in FIG. 2, in one possible embodiment, the distance from the mark point 3 to the first main grid 21 is a, and the distance from the mark point 3 to the second main grid 22 is b, where a≠b.

[0043] With such a design, in use, by identifying the distance from the mark point 3 to the different main grids 2, the polarity of the corresponding main grid 2 can be identified.

[0044] By providing the mark points 3 between adjacent main grids 2, the number of mark points 3 can be reduced, and two adjacent main grids 2 can be identified by a single mark point 3, thereby making it possible to know the corresponding polarities of the two adjacent main grids 2, and further obtaining the polarities of other main grids 2 based on the arrangement discipline of the main grids 2 to know the arrangement information of the main grids 2 of the battery cell. During identification, a comprehensive judgment can be made by combining the distance from the mark point 3 to the main grid 2 and the distance from the mark point 3 to the pad, which is advantageous to improving the accuracy of identification and better meets the actual needs of use.

[0045] In one possible embodiment, the distance from the mark point 3 to the first main grid 21 is a and the distance from the mark point 3 to the second main grid 22 is b, where a is in the range of 9 mm≦a≦18 mm and b is in the range of 9 mm≦b≦18 mm.

[0046] In one possible embodiment, the difference between a and b is between 1 mm and 9 mm, ie 1 mm≦|ab|≦9 mm.

[0047] The distance from the mark point 3 to the first main grid 21 may be 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, etc. The distance from the mark point 3 to the second main grid 22 may be 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, etc. The difference between the distance from the mark point 3 to the first main grid 21 and the distance from the mark point to the second main grid 22 may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, etc.

[0048] This design allows a certain difference between a and b, which reduces the possibility that the closeness of the values ​​of a and b will increase the difficulty of discrimination and will be disadvantageous in distinguishing whether the corresponding main grid 2 is a positive main grid or a negative main grid, whereas the closeness of the values ​​of a and b will be influenced by factors such as processing accuracy and will easily lead to indistinguishability or discrimination errors. By presetting the difference between a and b, a clear distinction between a and b can be made, making discrimination easier and improving the accuracy of discrimination.

[0049] In one possible embodiment, the distance from the mark point 3 to the first pad 211 is m, the distance from the mark point 3 to the second pad 221 is n, and the range of m is 9 millimeters≦m≦18 millimeters, and the range of n is 9 millimeters≦n≦18 millimeters.

[0050] In one possible embodiment, the difference between m and n is between 1 millimeter and 9 millimeters, ie 1 millimeter≦|mn|≦9 millimeters.

[0051] The distance from the mark point 3 to the first pad 211 may be 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, etc. The distance from the mark point 3 to the second pad 221 may be 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, 17 mm, 18 mm, etc. The difference between the distance from the mark point 3 to the first pad 211 and the distance from the mark point 3 to the second pad 221 may be 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, etc.

[0052] With this design, the difference between the distance from the mark point 3 to the first pad 211 and the distance from the mark point 3 to the second pad 221 can be made clear, so that by identifying the distance from the mark point 3 to the pad, it is convenient to identify the polarity of the corresponding main grid 2. With this design, it is possible to reduce the possibility that the values ​​of m and n are too close to each other, which increases the difficulty of identification and even leads to inability to identify or identification errors.

[0053] In one possible embodiment, the mark point 3 includes a first mark point 31 and a second mark point 32, the distance from the first mark point 31 to the first pad 211 is m, and the distance from the second mark point 32 to the second pad 221 is n. The values ​​of m and n can satisfy the above data range.

[0054] With this design, by setting a certain difference between m and n, it is possible to reduce the possibility that the values ​​of m and n are too close to each other, which increases the difficulty of discrimination and is disadvantageous in distinguishing whether the corresponding main grid 2 is a positive main grid or a negative main grid.

[0055] As shown in FIG. 2, in one possible embodiment, the mark point 3 and the first pad 211 and the second pad 221 are not collinear, i.e., the mark point 3 is not located in the same row as the first pad 211 and the second pad 221, and there is a gap between the mark point 3 and the first pad 211 and the second pad 221 along the extension direction of the main grid 2.

[0056] The distance from the mark point 3 to the first pad 211 is m, the distance from the mark point 3 to the second pad 221 is n, the distance from the mark point 3 to the first main grid 21 is a, the distance from the mark point 3 to the second main grid 22 is b, and the distance between the first pad 211 and the second pad 221 may be approximately equal to the distance between the first main grid 21 and the second main grid 22. When the mark point 3 and the first pad 211 and the second pad 221 are collinear, m+n is approximately equal to a+b; when the mark point 3 and the first pad 211 and the second pad 221 are not collinear, the connecting lines between the mark point 3 and the first pad 211 and the second pad 221 can form an approximate triangle, and the distance between the first pad 211 and the second pad 221 is approximately equal to the distance between the first main grid 21 and the second main grid 22. Based on the principle that the sum of both sides of a triangle is greater than the third side, m+n>a+b, so that by designing the mark point 3 not to be collinear with the pads, it is advantageous to increase the distance between the mark point 3 and the pads, which makes it easier to measure the distance between the mark point 3 and the pads, reducing the difficulty of measurement and identification, which is more advantageous to identifying the corresponding main grids, and further improving the accuracy of identifying the main grids.

[0057] In one possible embodiment, the shape of the mark point 3 may be circular, rectangular, triangular, etc.

[0058] The shape of the mark point 3 can be selected according to actual needs, thereby reducing the possibility of the mark point 3 contacting multiple main grids 2 and / or sub-grids 4 at the same time, causing a short circuit in the battery cell. When a battery cell includes multiple mark points 3, the shapes and sizes of the mark points 3 may be the same or different.

[0059] 3, in one possible embodiment, the first main grid 21 and the second main grid 22 are provided adjacent to each other, and the mark point 3 includes a first mark point 31 and a second mark point 32, both of which are located between the first main grid 21 and the second main grid 22, with the first mark point 31 located on a side of the second mark point 32 closer to the first main grid 21, and the second mark point 32 located on a side of the first mark point 31 closer to the second main grid 22. The first mark point 31 and the second mark point 32 have different shapes.

[0060] With this design, it is more convenient to check the positive and negative poles of the main grid 2 by the mark point 3, and the shape of the mark point 3 can be used to distinguish whether the mark point 3 is the first mark point 31 or the second mark point 32, thereby identifying whether the main grid 2 adjacent to the mark point 3 is the first main grid 21 or the second main grid 22, and identifying the polarity of the corresponding main grid 2.

[0061] As shown in FIG. 4, in one possible embodiment, the mark point 3 includes a first mark point 31 and a second mark point 32, where the first mark point 31 is provided on the first main grid 21 and the second mark point 32 is provided on the second main grid 22, and the shapes of the first mark point 31 and the second mark point 32 are different.

[0062] With this design, by detecting the shape of the mark point 3, it is possible to distinguish whether the corresponding main grid 2 is the first main grid 21 or the second main grid 22, and thereby know the polarity of the main grid 2. By identifying the main grid 2 by combining the shape of the mark point 3 and the distance from the mark point 3 to the pad, the polarity of the main grid 2 can be easily known, which is more convenient in actual use.

[0063] In one possible embodiment, the area of ​​a single mark point 3 is between 0.3 square millimeters and 4 square millimeters.

[0064] The area of ​​a single mark point 3 may be 0.3 square millimeters, 0.6 square millimeters, 0.9 square millimeters, 1.2 square millimeters, 1.5 square millimeters, 1.8 square millimeters, 2.1 square millimeters, 2.4 square millimeters, 2.7 square millimeters, 3.0 square millimeters, 3.3 square millimeters, 3.6 square millimeters, 3.9 square millimeters, 4.0 square millimeters, etc.

[0065] If the area of ​​the mark point 3 is too small, it is likely to cause difficulty in identifying the mark point 3, which is disadvantageous for identification. If the area of ​​the mark point 3 is too large, the mark point is likely to come into contact with multiple main grids 3 and / or sub-grids 4, causing a short circuit, and if the mark point 3 is too large, it will shield the surface of the battery cell and affect the light absorption efficiency of the battery cell, so the area of ​​the mark point 3 can be 0.3 square millimeters to 4 square millimeters. Such a design makes it easy to identify the mark point 3 and reduces the possibility that a single mark point 3 will come into contact with multiple main grids 2 and / or sub-grids 4 at the same time, thereby reducing the possibility of a short circuit of the battery cell due to the mark point 3.

[0066] In one possible embodiment, the material of the mark points 3 is silver paste.

[0067] If the material of the mark points 3 is silver paste, the mark points 3 can be printed simultaneously in the process of printing the main grid 2 and / or the sub-grid 4, thereby saving a processing step and improving processing efficiency. The mark points 3 may be made of other materials, but the mark points 3 must be printed separately in the processing process, which will complicate the process, reduce efficiency, and increase costs.

[0068] Based on the photovoltaic power generation modules according to the above embodiments, an embodiment of the present application further provides a photovoltaic power generation module, the photovoltaic power generation module includes a battery cell, the battery cell may be the battery cell according to any of the above embodiments, the battery cell may be electrically connected in the form of a full cell or a multi-cut cell to form a battery string, and the multiple battery strings are electrically connected in series and / or parallel. The photovoltaic power generation module may further include a sealing layer covering a surface of the battery string, and a cover plate covering a side of the sealing layer away from the battery string. A sealing layer and a cover plate may be provided on both opposing sides of the battery string along the thickness direction of the photovoltaic power generation module.

[0069] When welding a battery string, the polarity of the first main grid 21 and the second main grid 22 can be determined by the mark points 3 provided on the battery cells, thereby obtaining the polarity of the main grids of the battery cells and reducing the possibility of incorrect electrical connection of the battery cells.

[0070] The embodiments of the present application provide a battery cell and a photovoltaic power generation module, the battery cell includes a substrate 1, a main grid 2, and at least one mark point 3, the main grid 2 is provided on the same side of the substrate 1 and includes at least a first main grid 21 and a second main grid 22, the first main grid 21 and the second main grid 22 have opposite polarities, the first main grid 21 has a first pad 211, the second main grid 22 has a second pad 221, the first pad 211 and the second pad 221 are provided in sequence along a straight line parallel to the arrangement direction of the main grid 2, and the same mark point 3 has a different distance to the first pad 211 and a different distance to the second pad 221. With such a design, it is possible to determine whether the polarity of the corresponding main grid 2 is positive or negative based on the distance from the mark point 3 to the different pads, which is advantageous to identifying the polarity of the main grid 2 and facilitating the electrical connection of the battery cell.

[0071] The above describes in detail the structure, features and operational effects of the present invention based on the embodiments shown in the drawings. The above is only a preferred embodiment of the present invention, and the present invention is not limited to the scope of implementation shown in the drawings. Any modifications made based on the concept of the present invention or equivalent embodiments modified into equivalent changes should still be included in the protection scope of the present invention as long as they do not exceed the spirit contained in the specification and drawings. [Explanation of symbols]

[0072] 1-Base material 2-Main Grid 21-1st Main Grid 211-1st Pad 22-2nd Main Grid 221-2nd Pad 3- Mark Point 31-First Mark Point 32-Second Mark Point 4-Subgrid

Claims

1. A battery cell, The battery cell includes a substrate (1), a main grid (2), and at least one mark point (3); The main grid (2) is provided on the same side of the substrate (1), The mark points (3) are provided on the substrate (1) and / or the main grid (2), a first main grid (21) and a second main grid (22) having opposite polarities to each other, the first main grid (21) having a first pad (211) and the second main grid (22) having a second pad (221), the first pad (211) and the second pad (221) being arranged in sequence along a straight line parallel to an arrangement direction of the main grids (2), and the same mark point (3) has a different distance to the first pad (211) and a different distance to the second pad (221).

2. 2. The battery cell according to claim 1, wherein the number of the main grids (2) is an odd number, and adjacent main grids (2) along an arrangement direction of the main grids (2) have opposite polarities.

3. 3. The battery cell according to claim 2, characterized in that the battery cell includes at least two of the mark points (3).

4. 4. The battery cell according to claim 3, characterized in that the mark points (3) are provided on the main grid (2).

5. The two main grids (2) located at the outermost positions along the arrangement direction of the main grids (2) are the first main grids (21), the main grid (2) adjacent to the first main grid (21) is the second main grid (22), and the mark points (3) include a first mark point (31) and a second mark point (32); 5. The battery cell according to claim 4, wherein the first mark point (31) is provided on one of the first main grids (21), the second mark point (32) is provided on the second main grid (22) not adjacent to the first main grid (21), and a distance from the first mark point (31) to the corresponding first pad (211) is different from a distance from the second mark point (32) to the corresponding second pad (221).

6. the mark points (3) include a first mark point (31) and a second mark point (32), the first mark point (31) being provided on the first main grid (21) and the second mark point (32) being provided on the second main grid (22); The battery cell according to claim 4 , wherein the first mark point (31) and the second mark point (32) have different shapes.

7. 3. The battery cell according to claim 2, wherein the first main grid (21) and the second main grid (22) are adjacent to each other, and the mark point (3) is located between the first main grid (21) and the second main grid (22) along an arrangement direction of the main grids (2).

8. 8. The battery cell according to claim 7, wherein a is a distance from the mark point (3) to the first main grid (21) and b is a distance from the mark point (3) to the second main grid (22), and a ≠ b is satisfied.

9. 9. The battery cell of claim 8, wherein a distance a from the mark point (3) to the first main grid (21) satisfies 9 millimeters≦a≦18 millimeters, a distance b from the mark point (3) to the second main grid (22) satisfies 9 millimeters≦b≦18 millimeters, and / or a difference between the distance a from the mark point (3) to the first main grid (21) and the distance b from the mark point (3) to the second main grid (22) satisfies 1 millimeter≦|a-b|≦9 millimeters.

10. the mark point (3) includes a first mark point (31) and a second mark point (32), the first mark point (31) is located on a side of the second mark point (32) closer to the first main grid (21), and the second mark point (32) is located on a side of the first mark point (31) closer to the second main grid (22); The battery cell according to claim 7, wherein the first mark point (31) and the second mark point (32) have different shapes.

11. If the distance from the mark point (3) to the first pad (211) is m, then 9 mm≦m≦18 mm is satisfied; if the distance from the mark point (3) to the second pad (221) is n, then 9 mm≦n≦18 mm is satisfied; and / or The battery cell according to any one of claims 1 to 10, characterized in that, when a distance from the mark point (3) to the first pad (211) is m and a distance from the mark point (3) to the second pad (221) is n, 1 mm≦|m-n|≦9 mm is satisfied.

12. The battery cell according to any one of claims 1 to 10, characterized in that the area of ​​a single said mark point (3) is 0.3 mm2 to 4 mm2.

13. 11. The battery cell according to claim 1, wherein the mark point (3) has at least one of a circular shape, a rectangular shape, and a triangular shape.

14. 11. The battery cell according to any one of claims 1 to 10, characterized in that the material of the mark point (3) is silver paste.

15. A photovoltaic module, comprising: The photovoltaic module includes a battery cell, the battery cell including a substrate (1), a main grid (2) and at least one mark point (3), the main grid (2) being provided on the same side of the substrate (1), and the mark point (3) being provided on the substrate (1) and / or the main grid (2), The solar power generation module is characterized in that the main grid (2) includes at least a first main grid (21) and a second main grid (22), the first main grid (21) and the second main grid (22) have opposite polarities, the first main grid (21) has a first pad (211) and the second main grid (22) has a second pad (221), the first pad (211) and the second pad (221) are arranged in order along a straight line parallel to the arrangement direction of the main grid (2), and the same mark point (3) has a different distance to the first pad (211) and a different distance to the second pad (221).

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