Battery piece, photovoltaic module and printing screen of battery piece

Abstract

The embodiment of the utility model provides a battery piece, a photovoltaic module and a printing screen plate of the battery piece. The two ends of a bus electrode along a second direction are provided with fish forks; the two current collection electrodes located at the two ends of the second direction are first target current collection electrodes, the first target current collection electrodes and the edge electrodes are alternately arranged and are connected through chamfer electrodes, the chamfer electrodes extend in the third direction, the current collection electrode intersecting with the harpoon is a second target current collection electrode, and the second target current collection electrode intersects with the edge electrodes. The second target current collection electrode comprises a first type of current collection electrode and a second type of current collection electrode, the first type of current collection electrode intersects with the chamfering electrode and does not penetrate through the fish fork, and the second type of current collection electrode intersects with the edge electrode and penetrates through the fish fork; and the proportion A of the first type of current collection electrodes in the second target current collection electrode is less than or equal to 0.3. The risk of edge breakage, subfissure or fragmentation of the battery piece can be reduced, and the problem of blackening of the EL edge of the photovoltaic module is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaics, in particular to a battery sheet, a photovoltaic assembly and a printing screen for the battery sheet. Background Art

[0002] In recent years, photovoltaic power generation, as an important renewable energy power generation technology, has achieved rapid development. At present, the efficiency of intrinsic thin-film heterojunction (HTJ) cells is relatively high. As one of the cells with development potential, the high battery cost is the key to restricting its rapid development. The focus of HTJ cell development is to have higher efficiency and lower cost at the same time. Both the front and back of HTJ cells require paste grid lines to print grid line patterns. However, the existing grid line pattern design has the risk of the welding point between the edge fine grid and the welding strip becoming a stress center, resulting in the risk of battery cell edge collapse, hidden cracks or fragments; moreover, the photocurrent collection effect at the edge of the battery cell is poor, resulting in the blackening of the EL edge of the photovoltaic module. Utility Model Content

[0003] In view of the above problems, embodiments of the present utility model are proposed to provide a cell, a photovoltaic module and a printing screen for a cell that overcome the above problems or at least partially solve the above problems.

[0004] In order to solve the above problems, the embodiment of the utility model discloses a battery cell, comprising: a battery cell body and an electrode structure arranged on the battery cell body, the electrode structure comprising: a plurality of collector electrodes extending along a first direction and arranged at intervals along a second direction, two edge electrodes extending along the second direction and arranged opposite to each other along the first direction, and a plurality of bus electrodes extending along the second direction and arranged at intervals along the first direction between the two edge electrodes, wherein both ends of the bus electrode along the second direction are provided with harpoons; wherein,

[0005] Among the multiple collector electrodes, two of the collector electrodes located at both ends of the second direction are first target collector electrodes, the first target collector electrodes and the edge electrodes are alternately arranged, and the first target collector electrodes and the edge electrodes are connected by chamfered electrodes, the chamfered electrodes extend along a third direction, and the third direction, the first direction and the second direction intersect each other;

[0006] Among the multiple collecting electrodes, the collecting electrode intersecting with the harpoon is a second target collecting electrode, the second target collecting electrode includes a first type of collecting electrode and a second type of collecting electrode, the first type of collecting electrode does not penetrate the harpoon, the second type of collecting electrode penetrates the harpoon, the first type of collecting electrode intersects with the chamfered electrode, the second type of collecting electrode intersects with the edge electrode, and the first type of collecting electrode accounts for a proportion A≤0.3 of the second target collecting electrode.

[0007] Optionally, the number of the first type of collecting electrodes is 1-5.

[0008] Optionally, the number of the second type of collecting electrodes is 3-19.

[0009] Optionally, 0.1≤A≤0.25.

[0010] Optionally, the battery cell body includes a first lateral edge extending along the first direction and a second lateral edge extending along the second direction, the first lateral edge and the second lateral edge are alternately arranged and connected through a battery cell chamfer, and the battery cell chamfer extends along the third direction;

[0011] The second target collector electrode includes a third type of collector electrode, and an extension line of the third type of collector electrode intersects with the chamfer of the battery cell;

[0012] The number of the third type of collecting electrodes is less than the number of the first type of collecting electrodes.

[0013] Optionally, the battery cell chamfer and the chamfered electrode closest thereto are arranged correspondingly, and the distance between the corresponding battery cell chamfer and the chamfered electrode is 0.5-2 mm;

[0014] The first lateral edge and the first target current collecting electrode closest thereto are arranged correspondingly, and the corresponding spacing between the first lateral edge and the first target current collecting electrode is 0.3-1 mm;

[0015] The second lateral edge and the edge electrode closest thereto are arranged correspondingly, and the corresponding spacing between the second lateral edge and the edge electrode is 0.3-1 mm.

[0016] Optionally, the number of the collecting electrodes is 60-120.

[0017] Optionally, the distance between two adjacent collecting electrodes is 0.3-2 mm.

[0018] Optionally, the corresponding spacing between the battery cell chamfer and the chamfer electrode is a first value, the corresponding spacing between the first lateral edge and the first target collector electrode is a second value, and the corresponding spacing between the second lateral edge and the edge electrode is a third value;

[0019] The first value is respectively greater than the second value and the third value.

[0020] Optionally, the second numerical value is equal to the third numerical value.

[0021] In a second aspect, an embodiment of the utility model discloses a photovoltaic module, including the above-mentioned solar cell.

[0022] In a third aspect, an embodiment of the utility model discloses a printing screen for a battery cell, wherein the printing screen for a battery cell is used to print the electrode structure of the battery cell.

[0023] The utility model embodiment includes the following advantages:

[0024] In the embodiment of the utility model, the first type of collector electrode intersects with the chamfered electrode, and the first type of collector electrode does not penetrate the harpoon, the second type of collector electrode intersects with the edge electrode, and the second type of collector electrode penetrates the harpoon. Since the proportion of the first type of collector electrode in the second target collector electrode is A≤0.3, the proportion of the first type of collector electrode is relatively small, and after the photovoltaic module is serially welded, the activity space between the two cells can be larger; at the same time, since the first type of collector electrode does not penetrate the harpoon, the welding point between the welding strip and the first type of collector electrode can be avoided from becoming a stress center, thereby reducing the risk of edge collapse, hidden cracks or fragments of the cell. The second type of collector electrode has a large proportion, which can ensure the collection of carriers inside the harpoon, improve the problem of blackening of the edge of the photovoltaic module EL, enhance the stability of the harpoon, and improve the yield of the photovoltaic module. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the front side of a battery cell of the utility model;

[0026] Figure 2 This is a structural schematic diagram of the back side of a battery cell of the utility model;

[0027] Figure 3 It is a partial structural schematic diagram of the back side of a battery cell of the utility model;

[0028] Figure 4 It is a partial structural schematic diagram of the back side of another battery cell of the present invention.

[0029] Description of reference numerals:

[0030] 1-battery cell body, 11-first lateral edge, 12-second lateral edge, 13-battery cell chamfer, 2-electrode structure, 21-collecting electrode, 211-first target collecting electrode, 212-second target collecting electrode, 2121-first type of collecting electrode, 2122-second type of collecting electrode, 2123-third type of collecting electrode, 22-edge electrode, 23-bus electrode, 231-harpoon, 24-chamfered electrode. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0032] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this utility model, unless otherwise specified, "multiple" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0033] 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.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] One of the core concepts of the embodiments of the present utility model is to disclose a battery cell, such as Figure 1As shown, the battery cell includes a battery cell body 1 and an electrode structure 2 arranged on the battery cell body 1, the electrode structure 2 includes: a plurality of collector electrodes 21 extending along the first direction and arranged at intervals along the second direction, two edge electrodes 22 extending along the second direction and arranged opposite to each other along the first direction, and a plurality of bus electrodes 23 extending along the second direction and arranged at intervals between the two edge electrodes 22 along the first direction, and the bus electrodes 23 are provided with harpoons 231 at both ends of the second direction; wherein, among the plurality of collector electrodes 21, the two collector electrodes 21 located at both ends of the second direction are first target collector electrodes 211, the first target collector electrodes 211 and the edge electrodes 22 are arranged alternately, and the first target collector electrodes 211 and The edge electrodes 22 are connected by chamfered electrodes 24, and the chamfered electrodes 24 extend along the third direction. The third direction, the first direction, and the second direction intersect with each other. Among the multiple collecting electrodes 21, the collecting electrode 21 intersecting with the harpoon 231 is the second target collecting electrode 212. The second target collecting electrode 212 includes a first type of collecting electrode 2121 and a second type of collecting electrode 2122. The first type of collecting electrode 2121 does not penetrate the harpoon 231, and the second type of collecting electrode 2122 penetrates the harpoon 231. The first type of collecting electrode 2121 intersects with the chamfered electrode 24, and the second type of collecting electrode 2122 intersects with the edge electrode 22. The proportion of the first type of collecting electrode 2121 in the second target collecting electrode 212 is A≤0.3.

[0036] In an embodiment of the utility model, the first type of collecting electrode 2121 intersects with the chamfered electrode 24, and the first type of collecting electrode 2121 does not penetrate the harpoon 231, and the second type of collecting electrode 2122 intersects with the edge electrode 22, and the second type of collecting electrode 2122 penetrates the harpoon 231. Since the proportion A of the first type of collecting electrode 2121 in the second target collecting electrode 212 is ≤0.3, the proportion of the first type of collecting electrode 2121 is small. In this way, after the photovoltaic module is serially welded, the movable space between the two battery cells can be larger; at the same time, since the first type of collecting electrode 2121 does not penetrate the harpoon 231, the welding point between the first type of collecting electrode 2121 and the welding strip can be avoided from becoming a stress center, and the edge of the battery cell can be avoided from being welded, thereby reducing the risk of battery cell edge collapse, hidden cracks or fragments. The second type of collecting electrode 2122 accounts for a large proportion, which can ensure the collection of carriers inside the harpoon 231, improve the problem of blackening of the EL edge of the photovoltaic module, enhance the stability of the harpoon 231, ensure the effective conduction of current at both ends of the harpoon 231, and improve the yield of the photovoltaic module.

[0037] In the embodiment of the utility model, the cell may include a cell body 1 and an electrode structure 2 printed on the cell body 1. The cell includes but is not limited to bifacial cells such as tunneling oxide passivation contact (TOPcon) cells, or HJT cells. Among them, the TOPcon cell is a solar cell with tunneling oxide passivation contact based on the selective carrier principle.

[0038] Optionally, electrode structures 2 are provided on both the front and back sides of the battery cell body 1 to improve the reliability of the battery cell body 1 in collecting current through the electrode structures 2 .

[0039] Specifically, the front side of the battery cell body 1 is the light-receiving side of the battery cell body 1 , and the back side of the battery cell body 1 is the backlight side opposite to the front side.

[0040] Specifically, the electrode structure 2 is a grid line pattern printed on the battery cell body 1. The electrode structure 2 may include multiple collecting electrodes 21, two edge electrodes 22 and multiple bus electrodes 23. The collecting electrode 21 is a fine grid, the bus electrode 23 is a main grid, and the edge electrode 22 is a fine grid arranged at the edge of the pattern.

[0041] Further, the collector electrode 21 can extend along the first direction, and the edge electrode 22 and the bus electrode 23 can extend along the second direction, that is, the length direction of the collector electrode 21 is the first direction, and the length direction of the edge electrode 22 and the bus electrode 23 is the second direction, wherein the second direction is different from the first direction. Further, the first direction can be the width direction of the battery cell body 1, and the second direction can be the length direction of the battery cell body 1.

[0042] Specifically, the number of the collecting electrodes 21 on the front side of the cell body 1 is smaller than the number of the collecting electrodes 21 on the back side of the cell body 1 , which can increase the area of ​​the front side of the cell body 1 that receives sunlight.

[0043] Optionally, among the multiple collector electrodes 21, two collector electrodes 21 located at both ends of the second direction are first target collector electrodes 211, the first target collector electrodes 211 and the edge electrodes 22 are alternately arranged, and the first target collector electrodes 211 and the edge electrodes 22 are connected by chamfered electrodes 24, such as Figure 1 As shown, the first target collector electrode 211 , the edge electrode 22 and the chamfered electrode 24 enclose and form a circumferential edge of the electrode structure 2 .

[0044] Specifically, the chamfered electrodes 24 are respectively connected to the adjacent first target collector electrodes 211 and the edge electrodes 22 , so that the top corners of the electrode structure 2 can form a chamfered structure, which can reduce the stress concentration of the battery cell body 1 .

[0045] Specifically, the third direction, the first direction, and the second direction intersect each other, wherein the first direction and the second direction may be perpendicular.

[0046] Optionally, both ends of the bus electrode 23 may be provided with a harpoon 231 structure. Among the multiple collecting electrodes 21, the collecting electrode 21 intersecting with the harpoon 231 structure is the second target collecting electrode 212. The second target collecting electrode 212 may include a first type of collecting electrode 2121 and a second type of collecting electrode 2122. The first type of collecting electrode 2121 intersects with the chamfered electrode 24, and the first type of collecting electrode 2121 does not penetrate the harpoon 231. This can avoid the stress concentration point generated by welding the first type of collecting electrode 2121 with the welding strip. Moreover, after the photovoltaic module is serially welded, it is beneficial to increase the space between the two battery cells, thereby reducing the risk of battery cell edge collapse, hidden cracks or fragments.

[0047] Specifically, the second type of collecting electrode 2122 can intersect with the edge electrode 22, and the second type of collecting electrode 2122 can pass through the harpoon 231. This design can enable the welding strip of the bus electrode 23 to have a better collection effect on the photocurrent at the edge of the battery cell, and can ensure the collection of carriers inside the harpoon 231 to prevent the edge of the photovoltaic module from blackening, thereby improving the stability of the harpoon 231 and improving the yield of the photovoltaic module.

[0048] Furthermore, if Figure 3 As shown, the second target collecting electrode 212 includes a first type of collecting electrode 2121 and a second type of collecting electrode 2122. Since the proportion A of the first type of collecting electrode 2121 in the second target collecting electrode 212 is ≤0.3, the proportion of the first type of collecting electrode 2121 is relatively small, and the proportion of the second type of collecting electrode 2122 is relatively large. In this way, the risk of chipping, cracking or fragmentation of the edge of the battery cell can be further reduced, and the blackening phenomenon of the edge EL of the photovoltaic module can be improved, the stability of the harpoon 231 can be enhanced, and the yield of the photovoltaic module can be improved.

[0049] Specifically, the first type of collecting electrodes 2121 are collecting electrodes located at the end portion in the second direction, and the first type of collecting electrodes 2121 include the first target collecting electrodes 211 .

[0050] Optionally, A≤0.3 can effectively ensure that the first type of collecting electrodes 2121 accounts for a smaller proportion in the second target collecting electrodes 212 , and the second type of collecting electrodes 2122 accounts for a larger proportion in the second target collecting electrodes 212 .

[0051] Optionally, 0.1≤A≤0.25 can further reduce the proportion of the first type of collecting electrode 2121 in the second target collecting electrode 212, increase the proportion of the second type of collecting electrode 2122 in the second target collecting electrode 212, thereby reducing the risk of edge collapse, hidden cracks or fragments of the battery cell, and improving the problem of blackening of the EL edge of the photovoltaic module, enhancing the stability of the harpoon 231, and improving the yield of the photovoltaic module.

[0052] Optionally, the number of the first type of collecting electrodes 2121 may include 1-5, and the number of the first type of collecting electrodes 2121 may be reasonably arranged to reduce the risk of edge collapse, hidden cracks or fragments of the battery cell.

[0053] Optionally, the number of the second type of collecting electrodes 2122 may include 3-19, which can effectively ensure that the number of the second type of collecting electrodes 2122 is large and can better collect the carriers inside the harpoon 231.

[0054] In some specific embodiments of the present invention, Figure 1 As shown, in the back electrode structure 2 of the battery cell body 1, the number of the first type of collecting electrodes 2121 is 2, and the number of the second type of collecting electrodes 2122 is 8; Figure 2 As shown, in the front electrode structure 2 of the battery cell body 1, the number of the first type of collecting electrodes 2121 is 1, and the number of the second type of collecting electrodes 2122 is 3.

[0055] In some other optional embodiments of the utility model, the battery cell body 1 includes a first lateral edge 11 extending along a first direction and a second lateral edge 12 extending along a second direction, the first lateral edge 11 and the second lateral edge 12 are alternately arranged and connected by a battery cell chamfer 13, and the battery cell chamfer 13 extends along the third direction; the second target collecting electrode 212 includes a third type of collecting electrode 2123, and the extension line of the third type of collecting electrode 2123 intersects with the battery cell chamfer 13; the number of the third type of collecting electrodes 2123 is less than the number of the first type of collecting electrodes 2121, so that the number of intersections between the collecting electrode 21 and the battery cell chamfer 13 is less than the number of intersections between the collecting electrode 21 and the chamfered electrode 24, which can maximize the benefits of the battery cell efficiency, i.e., the power generation power, and the battery cell cost, i.e., the slurry consumption.

[0056] Optionally, the cell chamfer 13 and the chamfered electrode 24 closest thereto are arranged correspondingly, and the spacing between the corresponding cell chamfer 13 and the chamfered electrode 24 is 0.5-2mm; the first lateral edge 11 and the first target collecting electrode 211 closest thereto are arranged correspondingly, and the spacing between the corresponding first lateral edge 11 and the first target collecting electrode 211 is 0.3-1mm; the second lateral edge 12 and the edge electrode 22 closest thereto are arranged correspondingly, and the spacing between the corresponding second lateral edge 12 and the edge electrode 22 is 0.3-1mm.

[0057] In an embodiment of the utility model, the spacing between the corresponding battery cell chamfer 13 and the chamfered electrode 24 is 0.5-2mm, the spacing between the corresponding first lateral edge 11 and the first target collecting electrode 211 is 0.3-1mm, and the spacing between the corresponding second lateral edge 12 and the edge electrode 22 is 0.3-1mm, so that each edge of the electrode structure 2 is arranged corresponding to each edge of the battery cell, and the spacing between the edge of the correspondingly arranged electrode structure 2 and the edge of the battery cell body 1 is small, which can increase the efficiency of the battery cell, that is, the power generation power of the battery cell.

[0058] Specifically, Figure 4 As shown, the corresponding spacing between the cell chamfer 13 and the chamfer electrode 24 is a first value L1, the corresponding spacing between the first lateral edge 11 and the first target collecting electrode 211 is a second value L2, and the corresponding spacing between the second lateral edge 12 and the edge electrode 22 is a third value L3. The smaller the first value L1, the second value L2 and the third value L3 are, the higher the power generation power of the cell is under the same cell size, and vice versa.

[0059] Furthermore, controlling the first value L1 within 0.5-2 mm, controlling the second value L2 within 0.3-1 mm, and controlling the third value L3 within 0.3-1 mm can achieve better component power, improve mass production operability, and improve production yield.

[0060] Optionally, the first value L1, the second value L2 and the third value L3 may be the same or different, and may be set according to actual needs.

[0061] Specifically, the battery cell body 1 includes a first lateral edge 11, a second lateral edge 12 and a battery cell chamfer 13, the first lateral edge 11 extends along a first direction, that is, the first lateral edge 11 is parallel to the collecting electrode 21; the second lateral edge 12 extends along a second direction, that is, the second lateral edge 12 is parallel to the bus electrode 23; the battery cell chamfer 13 extends along a third direction, that is, the battery cell chamfer 13 is parallel to the chamfered electrode 24.

[0062] Specifically, the first lateral edge 11 , the second lateral edge 12 and the cell chamfer 13 may enclose and form a circumferential edge of the cell body 1 .

[0063] Furthermore, the number of the collector electrodes 21 may be 60-120. A larger number of collector electrodes 21 can improve the contact between the slurry and the battery cell, and further reduce the cost of the battery cell, that is, the slurry consumption.

[0064] Specifically, the greater the number of the current collecting electrodes 21 , the better the contact between the slurry and the battery cell.

[0065] In some further optional embodiments of the present invention, the spacing L4 between two adjacent collecting electrodes 21 is 0.3-2 mm. Thus, the spacing L4 between two adjacent collecting electrodes 21 can be shortened and the number of collecting electrodes 21 can be increased to improve the contact between the slurry and the battery cell, thereby further reducing the battery cell cost, i.e., the slurry consumption.

[0066] In some specific embodiments of the utility model, the spacing between the corresponding cell chamfer 13 and the chamfer electrode 24 is 0.5-2mm; the spacing between the corresponding first lateral edge 11 and the first target collecting electrode 211 is 0.3-1mm; the spacing between the corresponding second lateral edge 12 and the edge electrode 22 is 0.3-1mm, and the number of collecting electrodes 21 is 60-120, which can take into account the efficiency of the cell while optimizing the design of the grid line pattern of the electrode structure 2, making it cheaper and easier to mass produce, and reducing the generation of defective products in the production of cell and photovoltaic modules, indirectly reducing costs, and having a higher cost performance.

[0067] Optionally, the spacing between the corresponding battery cell chamfer 13 and the chamfer electrode 24 is a first value L1, the spacing between the corresponding first lateral edge 11 and the first target collecting electrode 211 is a second value L2, and the spacing between the corresponding second lateral edge 12 and the edge electrode 22 is a third value L3; the first value L1 is respectively greater than the second value L2 and the third value L3.

[0068] In the embodiment of the utility model, the first value L1 is respectively greater than the second value L2 and the third value L3, which can reduce the stress concentration of the battery cell body 1 at the top corner position and further reduce the risk of the battery cell being broken or cracked.

[0069] Optionally, the second value L2 is equal to the third value L3, so that a larger area of ​​the electrode structure 2 can be printed on the battery cell body 1 while ensuring the stability of the structural strength of the battery cell body 1, thereby improving the utilization rate of the battery cell body 1.

[0070] In the embodiment of the utility model, the first type of collector electrode 2121 intersects with the chamfered electrode 24 and does not penetrate the harpoon 231, the second type of collector electrode 2122 intersects with the edge electrode 22 and penetrates the harpoon 231, and the proportion A of the first type of collector electrode 2121 in the second target collector electrode 212 is ≤0.3; the corresponding spacing between the cell chamfer 13 and the chamfered electrode 24 is 0.5-2mm; the corresponding spacing between the first lateral edge 11 and the first target collector electrode 211 is 0.3-1mm; the corresponding spacing between the second lateral edge 12 and the edge electrode 22 is 0.3-1mm. The number of collector electrodes 21 is 60-120. The reliability of the cell can be guaranteed, and the convenience of welding the cell in the photovoltaic module can be improved.

[0071] The battery cell described in the embodiment of the utility model has at least the following advantages:

[0072] In the embodiment of the utility model, the first type of collector electrode intersects with the chamfered electrode, and the first type of collector electrode does not penetrate the harpoon, the second type of collector electrode intersects with the edge electrode, and the second type of collector electrode penetrates the harpoon. Since the proportion of the first type of collector electrode in the second target collector electrode is A≤0.3, the proportion of the first type of collector electrode is relatively small, and after the photovoltaic module is serially welded, the activity space between the two cells can be larger; at the same time, since the first type of collector electrode does not penetrate the harpoon, the welding point between the welding strip and the first type of collector electrode can be avoided from becoming a stress center, thereby reducing the risk of edge collapse, hidden cracks or fragments of the cell. The second type of collector electrode has a large proportion, which can ensure the collection of carriers inside the harpoon, improve the problem of blackening of the edge of the photovoltaic module EL, enhance the stability of the harpoon, and improve the yield of the photovoltaic module.

[0073] In a second aspect, an embodiment of the utility model further discloses a photovoltaic module, which may specifically include the above-mentioned solar cell.

[0074] Specifically, the photovoltaic module may include a front cover plate and a front packaging film stacked on the front side of the solar cell, and a rear cover plate and a rear packaging film stacked on the rear side of the solar cell.

[0075] The photovoltaic module described in the embodiment of the utility model has at least the following advantages:

[0076] In the embodiment of the utility model, the first type of collector electrode intersects with the chamfered electrode, and the first type of collector electrode does not penetrate the harpoon, the second type of collector electrode intersects with the edge electrode, and the second type of collector electrode penetrates the harpoon. Since the proportion of the first type of collector electrode in the second target collector electrode is A≤0.3, the proportion of the first type of collector electrode is relatively small, and after the photovoltaic module is serially welded, the activity space between the two cells can be larger; at the same time, since the first type of collector electrode does not penetrate the harpoon, the welding point between the welding strip and the first type of collector electrode can be avoided from becoming a stress center, thereby reducing the risk of edge collapse, hidden cracks or fragments of the cell. The second type of collector electrode has a large proportion, which can ensure the collection of carriers inside the harpoon, improve the problem of blackening of the edge of the photovoltaic module EL, enhance the stability of the harpoon, and improve the yield of the photovoltaic module.

[0077] In a third aspect, the embodiment of the utility model further discloses a printing screen for a battery cell, which can be used to print the electrode structure 2 of the above-mentioned battery cell.

[0078] Specifically, the printed screen of the battery cell may include a screen pattern corresponding to the electrode structure 2 .

[0079] Specifically, when preparing the electrode structure 2 on the battery cell body 1, the printed screen of the battery cell is usually used to contact and squeeze the battery cell body 1. In this way, after the stress at the corners of the battery cell body 1 is reduced, the probability of hidden cracks or breakage of the battery cell body 1 can be reduced, and the probability of the printed screen being scrapped due to hidden cracks or breakage of the battery cell body 1 can also be reduced, and the deformation of the printed screen caused by the corners of the battery cell is reduced, thereby ensuring the graphic stability of the printed screen of the battery cell and extending the service life of the printed screen.

[0080] The printed screen for the battery cell described in the embodiment of the utility model has at least the following advantages:

[0081] In the embodiment of the utility model, the first type of collector electrode intersects with the chamfered electrode, and the first type of collector electrode does not penetrate the harpoon, the second type of collector electrode intersects with the edge electrode, and the second type of collector electrode penetrates the harpoon. Since the proportion of the first type of collector electrode in the second target collector electrode is A≤0.3, the proportion of the first type of collector electrode is relatively small, and after the photovoltaic module is serially welded, the activity space between the two cells can be larger; at the same time, since the first type of collector electrode does not penetrate the harpoon, the welding point between the welding strip and the first type of collector electrode can be avoided from becoming a stress center, thereby reducing the risk of edge collapse, hidden cracks or fragments of the cell. The second type of collector electrode has a large proportion, which can ensure the collection of carriers inside the harpoon, improve the problem of blackening of the edge of the photovoltaic module EL, enhance the stability of the harpoon, and improve the yield of the photovoltaic module.

[0082] Although the preferred embodiments of the utility model embodiments have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the utility model embodiments.

[0083] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0084] The above is a detailed introduction to a battery cell, a photovoltaic module and a printing screen for a battery cell provided by the utility model. Specific examples are used in this article to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model. At the same time, for general technicians in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

Claims

1. A battery cell, characterized in that: include: A battery cell body and an electrode structure arranged on the battery cell body, the electrode structure comprising: a plurality of collector electrodes extending along a first direction and spaced apart along a second direction, two edge electrodes extending along the second direction and oppositely arranged along the first direction, and a plurality of bus electrodes extending along the second direction and spaced apart along the first direction between the two edge electrodes, wherein both ends of the bus electrode along the second direction are provided with harpoons; wherein, Among the multiple collector electrodes, two of the collector electrodes located at both ends of the second direction are first target collector electrodes, the first target collector electrodes and the edge electrodes are alternately arranged, and the first target collector electrodes and the edge electrodes are connected by chamfered electrodes, the chamfered electrodes extend along a third direction, and the third direction, the first direction and the second direction intersect each other; Among the multiple collecting electrodes, the collecting electrode intersecting with the harpoon is a second target collecting electrode, the second target collecting electrode includes a first type of collecting electrode and a second type of collecting electrode, the first type of collecting electrode does not penetrate the harpoon, the second type of collecting electrode penetrates the harpoon, the first type of collecting electrode intersects with the chamfered electrode, the second type of collecting electrode intersects with the edge electrode, and the first type of collecting electrode accounts for a proportion A≤0.3 of the second target collecting electrode.

2. The battery cell according to claim 1, characterized in that: The number of the first type of collecting electrodes includes 1-5.

3. The battery cell according to claim 1, characterized in that: The number of the second type of collecting electrodes ranges from 3 to 19.

4. The battery cell according to claim 1, characterized in that: 0.1≤A≤0.25。 5. The battery cell according to claim 1, characterized in that: The battery cell body comprises a first lateral edge extending along the first direction and a second lateral edge extending along the second direction, the first lateral edge and the second lateral edge are alternately arranged and connected by a battery cell chamfer, and the battery cell chamfer extends along the third direction; The second target collector electrode includes a third type of collector electrode, and an extension line of the third type of collector electrode intersects with the chamfer of the battery cell; The number of the third type of collecting electrodes is less than the number of the first type of collecting electrodes.

6. The battery cell according to claim 5, characterized in that: The cell chamfer and the chamfer electrode closest thereto are arranged correspondingly, and the distance between the corresponding cell chamfer and the chamfer electrode is 0.5-2 mm; The first lateral edge and the first target current collecting electrode closest thereto are arranged correspondingly, and the corresponding spacing between the first lateral edge and the first target current collecting electrode is 0.3-1 mm; The second lateral edge and the edge electrode closest thereto are arranged correspondingly, and the corresponding spacing between the second lateral edge and the edge electrode is 0.3-1 mm.

7. The battery cell according to claim 6, characterized in that: The number of the current collecting electrodes is 60-120.

8. The battery cell according to claim 6, characterized in that: The distance between two adjacent collector electrodes is 0.3-2 mm.

9. The battery cell according to claim 6, characterized in that: The corresponding spacing between the battery cell chamfer and the chamfer electrode is a first value, the corresponding spacing between the first lateral edge and the first target collector electrode is a second value, and the corresponding spacing between the second lateral edge and the edge electrode is a third value; The first value is respectively greater than the second value and the third value.

10. The battery cell according to claim 9, characterized in that: The second value is equal to the third value.

11. A photovoltaic module, characterized in that: A battery cell comprising any one of claims 1 to 10.

12. A printing screen for a battery cell, characterized in that: The printing screen of the battery cell is used for printing the electrode structure of the battery cell according to any one of claims 1 to 10.

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