Battery sheet and photovoltaic module

Abstract

The utility model discloses a kind of battery piece and photovoltaic module, battery piece includes: battery piece ontology and connecting electrode. Connecting electrode includes grid line and connecting point, connecting electrode is arranged on the at least one side surface of battery piece ontology, the height of connecting point in the thickness direction of battery piece ontology is H1, the distance between the at least one side surface of battery piece ontology and the side surface of at least one part of grid line away from battery piece ontology is H2, wherein, H1, H2 satisfy: H1 Thus, when interconnection structure piece is welded with grid line and connecting point, under high temperature condition, tin solder layer produced by welding the end of grid line away from connecting point and interconnection structure piece can be blocked from gathering towards connecting point, avoid that the paste of grid line is excessively consumed by interconnection structure piece, reduce the possibility of grid line break, prolong the service life of grid line, guarantee the welding effect of grid line and interconnection structure piece, ensure the normal collection of current, improve the reliability of battery piece.

Description

Technical Field

[0001] This utility model relates to the field of photovoltaic module technology, and in particular to a solar cell and a photovoltaic module. Background Technology

[0002] In the existing technology, during the welding process between the grid lines and the solder ribbon, some grid lines are consumed by the solder ribbon to form a solder layer. Under high temperature conditions, the solder layer will accumulate at the solder joint, which can easily lead to grid line breakage, affect current collection, and thus reduce the reliability of the solar cell. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a battery cell that can improve the reliability of the battery cell.

[0004] The second objective of this invention is to provide a photovoltaic module, including the solar cells described in the first aspect embodiment above.

[0005] According to a first aspect embodiment of the present invention, the battery cell includes: a battery cell body and a connecting electrode. The connecting electrode is disposed on at least one side surface of the battery cell body. The connecting electrode includes a grid line and a connection point. The grid line and the connection point are electrically connected. The height of the connection point in the thickness direction of the battery cell body is H1. The distance between at least a portion of the grid line on the side surface away from the battery cell body and the at least one side surface of the battery cell body is H2. Wherein, H1 and H2 satisfy: H1 < H2 ≤ 5H1.

[0006] According to the embodiments of the present invention, the battery cell has a feature where at least a portion of the surface of the end of the grid line near the connection point, away from the battery cell body, is higher than the surface of the connection point away from the battery cell body. When the interconnect structure is welded to the grid line and the connection point, under high temperature conditions, this setting prevents the solder layer generated by the welding of the end of the grid line away from the connection point to the interconnect structure from accumulating towards the connection point. This avoids excessive consumption of the grid line paste by the interconnect structure, reduces the possibility of grid line breakage, extends the service life of the grid line, ensures the welding effect between the grid line and the interconnect structure, ensures normal current collection, and improves the reliability of the battery cell.

[0007] In some embodiments, H1 and H2 further satisfy: 1μm≤H2-H1≤18μm.

[0008] In some embodiments, H2 further satisfies: 3μm≤H2≤20μm.

[0009] In some embodiments, the grid line includes: a first grid line portion and a second grid line portion, wherein the distance between the side surface of the first grid line portion away from the battery cell body and the at least one side surface of the battery cell body is H3; and the distance between the side surface of the second grid line portion away from the battery cell body and the at least one side surface of the battery cell body is H4, wherein H3 and H4 satisfy: H4 > H3.

[0010] In some embodiments, the side surface of the first grid line portion adjacent to the battery cell body is connected to at least one side surface of the battery cell body, and the first grid line portion is electrically connected to the connection point; the second grid line portion is connected to the side surface of the first grid line portion away from the battery cell body, and at least one of the second grid line portion and the connection point is integrally formed with the first grid line portion.

[0011] In some embodiments, the side surface of the first grid line portion away from the cell body is flush with the side surface of the connection point away from the cell body.

[0012] In some embodiments, at least one groove is formed on the side surface of at least a portion of the grid line away from the cell body.

[0013] In some embodiments, the groove divides the grid line into a plurality of grid line segments, and the groove is located on the side of at least one of the grid line segments away from the connection point.

[0014] In some embodiments, the grid line segment closest to the connection point is a blocking segment, and the distance between the side surface of the blocking segment away from the battery cell body and the at least one side surface of the battery cell body is H5, wherein H1 and H5 satisfy: H1 < H5 ≤ 4H1.

[0015] In some embodiments, the length of the blocking segment along the extension direction perpendicular to the grid line is L, wherein L satisfies: 0.2mm≤L≤2mm; and / or, the width of the blocking segment along the extension direction of the grid line is W, wherein W satisfies: 0.1mm≤W≤1mm.

[0016] In some embodiments, the blocking segment is a conductive metal material, a carbon material, or a conductive polymer material.

[0017] In some embodiments, the distance between the bottom wall of the groove and at least one side surface of the battery cell body is H6, wherein H2 and H6 satisfy: H6 < H2.

[0018] In some embodiments, there are multiple grooves, and the multiple grooves are arranged at intervals along the extension direction of the grid line.

[0019] In some embodiments, the connecting electrode includes a first connecting electrode and a second connecting electrode, the first connecting electrode and the second connecting electrode being alternately arranged along a direction perpendicular to the grid line, and the first connecting electrode and the second connecting electrode being located on the same side in the thickness direction of the cell body.

[0020] According to a second aspect of the present invention, the photovoltaic module includes: a solar cell, an interconnecting structure, and an insulating component. The solar cell is any one of the solar cells described in the above embodiments. The interconnecting structure is electrically connected to at least the connection point of the connecting electrode of the solar cell. The insulating component is disposed between the grid line of the connecting electrode and the interconnecting structure, and the blocking section of the grid line separates the insulating component from the connection point.

[0021] In some embodiments, along the direction perpendicular to the grid line, the length of the blocking segment is L1, and the length of the insulating element is L2, wherein L1 and L2 satisfy: 1 / 2L2≤L1≤L2, where 0.2mm≤L1≤2mm.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a partial schematic diagram of a battery cell according to an embodiment of the present utility model; Figure 2 This is a partial schematic diagram of a photovoltaic module according to an embodiment of the present utility model; Figure 3 This is a schematic diagram of a first grid line portion and a second grid line portion being integrally formed according to an embodiment of the present invention; Figure 4 This is a schematic diagram showing that, according to an embodiment of the present invention, the second grid line portion is stacked on the first grid line portion and the first grid line portion and the connection point are integrally formed parts; Figure 5 This is a schematic diagram of a first grid line portion and a second grid line portion being integrally formed according to another embodiment of the present invention; Figure 6 This is a schematic diagram showing at least one groove formed on the grid line according to an embodiment of the present invention; Figure 7 This is a schematic diagram showing multiple grooves formed on the grid line according to an embodiment of the present invention; Figure 8This is a printed schematic diagram of a blocking segment according to an embodiment of the present utility model; Figure 9 This is another printed schematic diagram of the blocking segment according to an embodiment of the present utility model; Figure 10 This is another printed schematic diagram of the blocking segment according to an embodiment of the present utility model.

[0024] Figure label: 100. Battery cells; 10. Solar cell body; 11. First grid line; 12. Second grid line; 20. Connecting electrode; 21. Grid line; 22. First grid line portion; 221. First sub-grid line portion; 222. Second sub-grid line portion; 23. Second grid line portion; 24. Connection point; 25. Groove; 26. Grid line segment; 27. Blocking segment; 271. First sub-blocking segment; 272. Second sub-blocking segment; 28. First connecting electrode; 281. First main grid line; 282. First connection point; 29. ​​Second connecting electrode; 291. Second main grid line; 292. Second connection point; 30. Interconnecting structural components; 31. Insulating components; A. First direction; B. Second direction; C. Third direction. Detailed Implementation

[0025] The embodiments of this utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Figures 1-10 The battery cell 100 according to an embodiment of the present utility model is described. The battery cell 100 includes: a battery cell body 10 and a connecting electrode 20.

[0026] Specifically, such as Figures 1-4 As shown, a connecting electrode 20 is disposed on at least one side surface of the battery cell body 10. The connecting electrode 20 includes a grid line 21 and a connection point 24, which are electrically connected. The height of the connection point 24 in the thickness direction of the battery cell body 10 is H1. The distance between at least a portion of the grid line 21 on the side surface away from the battery cell body 10 and at least one side surface of the battery cell body 10 is H2, wherein H1 and H2 satisfy: H1 < H2 ≤ 5H1. The battery cell body 10 has a first direction A, a second direction B, and a third direction C. The first direction A is the length direction of the battery cell body 10, the second direction B is the width direction of the battery cell body 10, and the third direction C is the thickness direction of the battery cell body 10.

[0027] In this embodiment, the connecting electrode 20 is adapted to collect the current on the cell body 10 and lead it to an external circuit through the interconnect structure 30 described below. The grid line 21 extends along the first direction A. The grid line 21 and the connection point 24 are disposed along the third direction C on at least one side surface of the cell body 10. The grid line 21 is a discontinuous grid line 21. The connection point 24 is disposed along the first direction A at the discontinuity of the grid line 21 and forms an electrical connection with the grid line 21. Interconnector 30 is disposed along the third direction C on the surface of the grid line 21 and the connection point 24 away from the cell body 10. The interconnector 30 is welded to the grid line 21 and the connection point 24 to form an electrical connection. Along the third direction C, the height of at least a portion of the surface of the grid line 21 near the connection point 24 away from the cell body 10 is greater than the height of the surface of the connection point 24 away from the cell body 10, i.e., H2 > H1. When H2 ≤ 5H1, the distance from the surface of the grid line 21 near the connection point 24 away from the cell body 10 to the cell body 10 can be avoided to be too large, reducing the risk of cell cracking after photovoltaic module lamination. For example, H2 = 3H1. The grid line 21 and the connection point 24 are printed using silver paste or silver-copper paste, and the surface of the interconnector 30 is coated with a tin layer.

[0028] According to the embodiment of the present invention, the battery cell 100, by limiting that at least a portion of the surface of the end of the grid line 21 near the connection point 24 away from the battery cell body 10 is higher than the surface of the connection point 24 away from the battery cell body 10, when the interconnect structure 30 is welded to the grid line 21 and the connection point 24, under high temperature conditions, the setting that at least a portion of the end of the grid line 21 near the connection point 24 is higher than the connection point 24 can prevent the solder layer generated by the welding of the end of the grid line 21 away from the connection point 24 to the interconnect structure 30 from accumulating towards the connection point 24, avoiding excessive consumption of the paste of the grid line 21 by the interconnect structure 30, reducing the possibility of grid line 21 grid breakage, extending the service life of the grid line 21, ensuring the welding effect of the grid line 21 and the interconnect structure 30, ensuring normal current collection, and improving the reliability of the battery cell 100.

[0029] Optionally, the interconnect structure 30 is a solder strip.

[0030] Optionally, the insulating element 31 described below is disposed along the third direction C between at least a portion of the gate line 21 and the interconnect structure 30 to reduce the contact area between the gate line 21 and the interconnect structure 30, thereby preventing the gate line 21 from being completely consumed by the tin layer on the surface of the interconnect structure 30 when it is soldered to the interconnect structure 30.

[0031] Optionally, at least a portion of one end of the gate line 21 near the connection point 24 is positioned higher than the connection point 24. Even if the solder layer at the gate line 21 near the connection point 24 flows toward the connection point 24 during the soldering process, the end of the gate line 21 near the connection point 24 can still maintain a certain height in the third direction C, thereby preventing the gate line 21 from breaking and ensuring normal current collection.

[0032] According to some embodiments of this utility model, H1 and H2 further satisfy: 1μm≤H2-H1≤18μm.

[0033] When H2-H1 < 1 μm, the distance between at least a portion of the surface of the grid line 21 near the connection point 24 away from the cell body 10 and the surface of the connection point 24 away from the cell body 10 is too small, and the distance between the surface of the grid line 21 near the connection point 24 away from the cell body 10 and the surface of the connection point 24 away from the cell body 10 is too close, which may not prevent the solder layer generated by welding the end of the grid line 21 away from the connection point 24 to the interconnect structure 30 from spreading to the connection point 24. When H2-H1 > 18 μm, the distance between at least a portion of the surface of the grid line 21 near the connection point 24 away from the cell body 10 and the surface of the connection point 24 away from the cell body 100 is too large, and the height of at least a portion of the grid line 21 along the third direction C is too high, resulting in increased paste cost and easy cracking of the cell 100 after photovoltaic module lamination. For example, H2-H1 = 10 μm.

[0034] Therefore, by limiting the range of H2-H1, that is, limiting the distance range between the side surface of at least a portion of the end of the grid line 21 near the connection point 24 away from the cell body 10 and the side surface of the connection point 24 away from the cell body 10, it is possible to avoid the distance between the side surface of at least a portion of the end of the grid line 21 near the connection point 24 away from the cell body 10 and the side surface of the connection point 24 away from the cell body 10 being too close. At least a portion of the end of the grid line 21 near the connection point 24 is set higher than the connection point 24, which can effectively prevent the solder layer generated by welding the end of the grid line 21 away from the connection point 24 to the interconnect structure 30 from accumulating towards the connection point 24, avoiding excessive consumption of the paste of the grid line 21 by the interconnect structure 30, reducing the possibility of grid line 21 grid breakage. At the same time, it avoids the height of the second grid line portion 23 along the third direction C being too high, reducing production costs, reducing the risk of cell 100 cracking, extending the service life of the cell 100, and improving the reliability of the cell 100.

[0035] Optionally, H2 further satisfies: 3μm≤H2≤20μm. For example, H2=10μm.

[0036] Optionally, the distance between at least a portion of the side surface of the grid line 21 that is away from the battery cell body 10 and the battery cell body 10 can be specifically set according to actual needs.

[0037] According to some embodiments of this utility model, such as Figure 4 As shown, the grid line 21 includes a first grid line portion 22 and a second grid line portion 23. The distance between the surface of the first grid line portion 22 away from the battery cell body 10 and at least one surface of the battery cell body 10 is H3; the distance between the surface of the second grid line portion 23 away from the battery cell body 10 and at least one surface of the battery cell body 10 is H4, where H3 and H4 satisfy: H4 > H3. That is, along the third direction C, the height of the surface of the second grid line portion 23 away from the battery cell body 10 is greater than the height of the surface of the first grid line portion 22 away from the battery cell body 10.

[0038] According to some embodiments of this utility model, combined with Figure 3 and Figure 4 The first grid line portion 22 is connected to at least one side surface of the battery cell body 10 on one side surface of the battery cell body 10, and the first grid line portion 22 is electrically connected to the connection point 24; the second grid line portion 23 is connected to the side surface of the first grid line portion 22 away from the battery cell body 10, and at least one of the second grid line portion 23 and the connection point 24 is integrally formed with the first grid line portion 22.

[0039] The first grid line portion 22 and the connection point 24 are disposed along a third direction C on at least one side surface of the cell body 10, and the first grid line portion 22 and the connection point 24 form an electrical connection. The second grid line portion 23 is disposed along a third direction C at one end of the first grid line portion 22 adjacent to the connection point 24 and located on the side surface away from the cell body 10, that is, the second grid line portion 23 is stacked along a third direction C on the side surface of the first grid line portion 22 away from the cell body 10. Figure 3 The first grid line portion 22 and the second grid line portion 23 can be printed together in one step along the third direction C and printed separately from the connection point 24, thus combining them. Figure 4 The first grid line portion 22 can also be printed and formed at the connection point 24 at one time. Based on the first grid line portion 22, a second grid line portion 23 is provided on the surface of the first grid line portion 22 away from the battery cell body 10. The second grid line portion 23 can be printed separately from the first grid line portion 22 by a secondary printing method.

[0040] Therefore, at least one of the second grid line portion 23 and the connection point 24 is integrally formed with the first grid line portion 22, which can improve the setting efficiency of the connection electrode 20. In the third direction C, the distance from the side surface of the second grid line portion 23 away from the cell body 10 to the cell body 10 is greater than the distance from the connection point 24 and the side surface of the first grid line portion 22 away from the cell body 10 to the cell body 10. The second grid line portion 23 can prevent the solder layer generated at the end of the first grid line portion 22 away from the connection point 24 from spreading to the connection point 24, avoid the excessive consumption of the paste of the grid line 21 by the interconnect structure 30, reduce the possibility of grid line 21 grid breakage, ensure normal current collection, and improve the reliability of the cell 100.

[0041] Optionally, combined Figure 5 The second grid line portion 23 is disposed between the first grid line portion 22 and the connection point 24 along the first direction A. The end of the second grid line portion 23 away from the first grid line portion 22 is electrically connected to the connection point 24. The distance from the surface of the second grid line portion 23 away from the battery cell body 10 to the battery cell body 10 is greater than the distance from the connection point 24 and the surface of the first grid line portion 22 away from the battery cell body 10 to the battery cell body 10. The second grid line portion 23 and the first grid line portion 22 can be integrally formed or separately formed. In this embodiment, the second grid line portion 23 and the first grid line portion 22 are integrally formed as an example. Here, integrally forming the second grid line portion 23 and the first grid line portion 22 means that the second grid line portion 23 and the first grid line portion 22 are printed simultaneously; separate forming the second grid line portion 23 and the first grid line portion 22 means that the second grid line portion 23 and the first grid line portion 22 are printed separately, and the printing order can be different. Therefore, the second grid section 23 can prevent the solder layer generated on the first grid section 22 from spreading to the connection point 24, prevent the paste of the first grid section 22 from being excessively consumed by the interconnect structure 30, reduce the possibility of grid breakage of the first grid section 22, ensure normal current collection, and improve the reliability of the cell 100.

[0042] According to some embodiments of this utility model, such as Figure 4As shown, the surface of the first grid line portion 22 away from the cell body 10 is flush with the surface of the connection point 24 away from the cell body 10. That is, the distance from the surface of the first grid line portion 22 away from the cell body 10 along the third direction C to the cell body 10 is the same as the distance from the surface of the connection point 24 away from the cell body 10 along the third direction C to the cell body 10, H1=H3. This facilitates simultaneous printing of the first grid line portion 22 and the connection point 24, improving printing efficiency. Simultaneously, it ensures that the height of the surface of the second grid line portion 23 away from the cell body 10 is greater than the heights of both the first grid line portion 22 and the connection point 24 away from the cell body 10, preventing the solder layer generated at the end of the first grid line portion 22 away from the connection point 24 from spreading to the connection point 24, reducing the possibility of grid line 21 breakage, ensuring normal current collection, and improving the reliability of the cell 100.

[0043] Optionally, the insulating member 31 is disposed along the third direction C between the portion of the first gate line portion 22 not covered by the second gate line portion 23 and the interconnecting structure member 30.

[0044] According to some embodiments of this utility model, such as Figure 6 and Figure 7 As shown, at least one groove 25 is formed on the surface of at least a portion of the grid line 21 on the side away from the battery cell body 10.

[0045] In this embodiment, the first grid line portion 22 and the connection point 24 are printed first, and then at least two second grid line portions 23 are printed on the first grid line portion 22. The two second grid line portions 23 are spaced apart along the first direction A, and the two second grid line portions 23 and the first grid line portion 22 together define a groove 25. Optionally, the first grid line portion 22 and the second grid line portion 23 are printed first, and then the connection point 24 is printed. At least one groove 25 is formed on the surface of the second grid line portion 23 away from the battery cell body 10. The number of grooves 25 is not limited.

[0046] Thus, a groove 25 is formed on the second gate line portion 23, or the first gate line portion 22 and multiple second gate line portions 23 are used to construct the groove 25. When a portion of the insulating material 31 between the gate line 21 and the interconnect structure 30 diffuses into the groove 25, during the soldering process, at high temperatures, the groove 25 can buffer the insulating material 31 flowing towards the connection point and the solder layer at the end away from the connection point 24, preventing the insulating material 31 and the solder layer at the end away from the connection point 24 from further diffusing towards the connection point 24, thereby preventing the gate line 21 from breaking and improving the connection strength and reliability between the connection point 24 and the interconnect structure 30.

[0047] According to some embodiments of this utility model, such as Figure 6As shown, the groove 25 divides the grid line 21 into a plurality of grid line segments 26, and the groove 25 is located on the side of at least one grid line segment 26 away from the connection point 24. In this embodiment, multiple first grid lines 22 and connection points 24 are printed at the same horizontal plane in the thickness direction of the battery cell body 10, with the same height. The multiple first grid lines 22 include two first sub-grid lines 221 and one second sub-grid line 222. The second sub-grid line 222 is disposed between two adjacent first sub-grid lines 221. The connection point 24 is disposed along the first direction A on the side of the first sub-grid line away from the second sub-grid line 222. Second grid lines 23 are printed on the two first sub-grid lines 221 respectively. The first sub-grid lines 221 and the second grid lines 23 on the first sub-grid lines 221 are formed into grid lines 26. The grid lines 26 are spaced apart along the first direction A. The second sub-grid lines 222 are disposed between two adjacent grid lines 26. The two adjacent grid lines 26 and the second sub-grid lines 222 between the two adjacent grid lines 26 together define a groove 25. Thus, by designing the groove 25 to be located on the side of at least one gate segment 26 away from the connection point 24, it is convenient to buffer the insulation 31 migrating toward the connection point 24 and the solder layer at the end away from the connection point 24, and to prevent the insulation 31 and the solder layer at the end away from the connection point 24 from migrating toward the connection point 24.

[0048] According to some embodiments of this utility model, such as Figure 6 As shown, the grid line segment 26 closest to the connection point 24 is the blocking segment 27. The distance between the side surface of the blocking segment 27 away from the battery cell body 10 and the at least one side surface of the battery cell body 10 is H5, wherein H1 and H5 satisfy: H1 < H5 ≤ 4H1.

[0049] When H5 > 4H1, the distance from the surface of the blocking segment 27 away from the cell body 10 along the third direction C to the cell body 10 is too large, resulting in increased paste cost and easy cracking of the cell 100 after photovoltaic module lamination. For example, H5 = 3H1.

[0050] Optionally, such as Figure 6 As shown, the gate line segment 26 formed by the first sub-gate line portion 221 adjacent to the connection point 24 and the second gate line portion 23 on the first sub-gate line portion 221 is a blocking segment 27. Optionally, the first sub-gate line portion 221 and the second gate line portion 23 on the first sub-gate line portion 221 can be printed in one step, and then the second sub-gate line portion 222 between adjacent gate line segments 26 and the connection point 24 can be printed in one step.

[0051] Therefore, by limiting the distance range between the side surface of the blocking section 27 away from the cell body 10 and the cell body 10, it is ensured that the blocking section 27 can prevent the insulation 31 and solder layer in the groove 25 from migrating to the connection point 24, thus avoiding grid line 21 breakage, improving the connection strength and reliability between the connection point 24 and the interconnection structure 30. At the same time, it avoids the blocking section 27 from being too high along the third direction C, reducing production costs, reducing the risk of cell 100 cracking, extending the service life of cell 100, and improving the reliability of cell 100.

[0052] Optionally, combined Figure 8 First, print the first grid line portion 22 and the connection point 24, then print the blocking segment 27 between the first grid line portion 22 and the connection point 24 in one step, or, combine Figure 9 First, the first grid line portion 22 and the connection point 24 are printed. Then, a blocking segment 27 is printed in one step between the first grid line portion 22 and the connection point 24. The blocking segment 27 printed in one step is the first sub-blocking segment 271. To increase the height of the blocking segment 27, a second blocking segment 27 of a certain height can be printed simultaneously on the first sub-blocking segment 271 during the printing of the blocking segment 27, forming a second sub-blocking segment 272. The distance between the side of the second sub-blocking segment 272 away from the first sub-blocking segment 271 and the adjacent side of the first sub-blocking segment 271 is equal to the distance between the surface of the connection point 24 away from the battery cell body 10 and the surface of the adjacent side of the battery cell body 10, or, combined with Figure 10 The first grid line portion 22 and the connection point 24 are printed in one step, and then the blocking segment 27 is printed on the surface of the first grid line portion 22 near the connection point 24 and along the third direction C away from the battery cell body 10.

[0053] According to some embodiments of the present invention, the length of the blocking segment 27 along the extension direction perpendicular to the grid line 21, i.e., the second direction B, is L, and L satisfies: 0.2mm≤L≤2mm.

[0054] When the length of the blocking segment 27 along the second direction B is less than 0.2 mm, the length of the blocking segment 27 along the second direction B is small, which may not effectively prevent the insulation component 31 and the solder layer from migrating to the connection point 24; when the length of the blocking segment 27 along the second direction B is greater than 2 mm, the length of the blocking segment 27 along the second direction B is large, resulting in increased slurry costs. For example, L=1 mm.

[0055] Therefore, by limiting the length range of the blocking segment 27 along the second direction B, the insulation component 31 and the solder layer can be effectively prevented from migrating to the connection point 24, thus avoiding grid line 21 breakage, improving the connection strength and reliability between the connection point 24 and the interconnection structure 30, while reducing production costs and improving the reliability of the battery cell 100.

[0056] Optionally, combined Figure 7 The width of the blocking segment 27 along the extension direction of the grid line 21, i.e. the first direction A, is W, and W satisfies: 0.1mm≤W≤1mm.

[0057] When the width of the blocking segment 27 along the first direction A is less than 0.1 mm, the width of the blocking segment 27 along the first direction A is small, which may result in lower structural strength of the blocking segment 27; when the width of the blocking segment 27 along the first direction A is greater than 1 mm, the width of the blocking segment 27 along the first direction A is large, increasing production costs. For example, W=0.5 mm.

[0058] Therefore, by limiting the width range of the blocking segment 27 along the first direction A, the structural strength of the blocking segment 27 is ensured, production costs are reduced, and the reliability of the battery cell 100 is improved.

[0059] Optionally, L satisfies: 0.2mm≤L≤2mm, and W satisfies: 0.1mm≤W≤1mm.

[0060] According to some embodiments of this utility model, the blocking segment 27 is made of conductive metal, carbon, or conductive polymer material. The material of the blocking segment 27 must have excellent conductivity. The blocking segment 27 is formed by a composite of one or more of the following materials: conductive metal, carbon, or conductive polymer. This improves the conductivity of the blocking segment 27, thereby enhancing the overall conductivity of the grid line 21 and increasing the current transmission efficiency of the solar cell 100.

[0061] According to some embodiments of this utility model, such as Figure 6 and Figure 7 As shown, the distance between the bottom wall of the groove 25 and at least one side surface of the battery cell body 10 is H6, wherein H2 and H6 satisfy: H6 < H2.

[0062] That is, the distance from the surface of the groove 25 away from the cell body 10 along the third direction C to the cell body 10 is less than the distance from the surface of the second grid line portion 23 away from the cell body 10 along the third direction C to the cell body 10. When H6 ≥ H2, a circumferentially closed groove 25 cannot be formed, and the insulating member 31 and the solder layer at the end away from the connection point 24 may flow to the surface of the connection point 24 away from the cell body 10. Therefore, by limiting the height of the bottom wall of the groove 25 to be lower than the height of the surface of the second grid line portion 23 away from the cell body 10, it can be ensured that the insulating member 31 and the solder layer in the groove 25 are blocked by the second grid line portion 23, thereby effectively preventing the insulating member 31 and the solder layer in the groove 25 from flowing to the surface of the connection point 24 away from the cell body 10, preventing grid line 21 from breaking, improving the connection strength and reliability between the connection point 24 and the interconnection structure 30, and improving the reliability of the cell 100.

[0063] According to some embodiments of this utility model, such as Figure 7 As shown, there are multiple grooves 25, which are arranged at intervals along the extension direction of the grid line 21.

[0064] Multiple grooves 25 are formed on the surface of the second grid line portion 23 away from the cell body 10, and the multiple grooves 25 are arranged at intervals along the first direction A. Therefore, by providing multiple grooves 25, the buffering effect of the grooves 25 on the insulating member 31 and the solder layer at the end away from the connection point 24 can be further improved, further preventing the solder layer at the end of the insulating member 31 and the end away from the connection point 24 from flowing to the surface of the connection point 24 away from the cell body 10, improving the connection strength and reliability between the connection point 24 and the interconnection structure 30, preventing grid line 21 from breaking, and improving the reliability of the cell 100.

[0065] According to some embodiments of this utility model, such as Figure 1 and Figure 2 As shown, the connecting electrode 20 includes a first connecting electrode 28 and a second connecting electrode 29. The first connecting electrode 28 and the second connecting electrode 29 are alternately arranged along the direction of the vertical grid line 21. The first connecting electrode 28 and the second connecting electrode 29 are located on the same side in the thickness direction of the cell body 10.

[0066] The first connecting electrode 28 and the second connecting electrode 29 are disposed on the same side surface of the battery cell body 10 along a third direction C. The polarities of the first connecting electrode 28 and the second connecting electrode 29 are opposite. Both the first connecting electrode 28 and the second connecting electrode 29 extend along a first direction A. The first connecting electrode 28 and the second connecting electrode 29 are arranged alternately along a second direction B. Both the first connecting electrode 28 and the second connecting electrode 29 include grid lines 21. The first connecting electrode 28 and the second connecting electrode 29 are disposed on at least one side surface of the battery cell body 10 along a third direction C. The connection point 24 includes a first connection point 282 and a second connection point 292. The first connecting electrode 28 includes a first main grid line 281 and a first connection point 282. The second connecting electrode 29 includes a first main grid line 281 and a first connection point 282. The battery cell 100 also includes a first sub-busbar 11 and a second sub-busbar 12, with two main busbars 291 and a second connection point 292. Both the first sub-busbar 11 and the second sub-busbar 12 extend along a second direction B and are alternately spaced along a first direction A. The first main busbar 281 and the second main busbar 291 extend along a first direction A and are alternately spaced along a second direction B. The second sub-busbar 12 adjacent to the first main busbar 281 is intermittently arranged. The first main busbar 281 is located at the discontinuity of the second sub-busbar 12 and is spaced apart from the second sub-busbar 12 along the second direction B. The first sub-busbar 11 adjacent to the second main busbar 291 is intermittently arranged. The second main busbar 291 is located at the discontinuity of the first sub-busbar 11 and is spaced apart from the first sub-busbar 11 along the second direction B.

[0067] Taking the first connecting electrode 28 as an example, the first sub-grid line 11 can be electrically connected to the first main grid line 281 or to the first connection point 282. The first main grid line 281 can be intermittently or continuously arranged along the first direction A. When the first main grid line 281 is intermittently arranged along the first direction A, the first connection point 282 is located at the discontinuity of the first main grid line 281 and is electrically connected to the first main grid line 281. The interconnection structure 30 is located along the third direction C on the side of the first main grid line 281 and the first connection point 282 away from the cell body 10. The first main grid line 281 and the first connection point 282 are welded to the surface of the first main grid line 281 to form an electrical connection. When the first main grid line 281 is continuously arranged along the first direction A, the first connection point 282 is arranged along the third direction C on the surface of the first main grid line 281 away from the cell body 10 and forms an electrical connection with the first main grid line 281. The interconnect structure 30 is arranged along the third direction C on the surface of the first main grid line 281 and the first connection point 282 away from the cell body 10 and is welded to the first main grid line 281 and the first connection point 282 respectively to form an electrical connection. Among them, the first main grid line 281 is the grid line 21 in the above embodiment. The second connection electrode 29 is similar and will not be described in detail here.

[0068] Therefore, by setting the first connecting electrode 28 and the second connecting electrode 29, it is convenient to collect currents of different polarities from the cell body 10. At least a portion of one end of the grid line 21 of the first connecting electrode 28 and the second connecting electrode 29 adjacent to the connection point 24 is higher than the connection point 24. This can prevent the solder layer generated by welding the end of the grid line 21 away from the connection point 24 to the interconnect structure 30 from accumulating towards the connection point 24, reducing the possibility of grid line 21 grid breakage, ensuring normal current collection, and improving the reliability of the connecting electrode 20 and the cell 100.

[0069] According to the photovoltaic module of the second aspect embodiment of the present invention, such as Figure 2 As shown, the photovoltaic module includes: a solar cell 100, an interconnect structure 30, and an insulating member 31. The solar cell 100 is any one of the solar cells 100 described in the above embodiments. The interconnect structure 30 is electrically connected to at least the connection point 24 of the connecting electrode 20 of the solar cell 100. The insulating member 31 is disposed between the grid line 21 of the connecting electrode 20 and the interconnect structure 30. The blocking section 27 of the grid line 21 separates the insulating member 31 from the connection point 24.

[0070] In this application, the photovoltaic module is a back-contact solar photovoltaic module. The interconnect structure 30 is disposed along the third direction C on the side surface of the grid line 21 and the connection point 24 away from the cell body 10. The interconnect structure 30 is welded to the grid line 21 and the connection point 24 respectively to form an electrical connection. The insulating member 31 is disposed along the third direction C between the grid line 21 and the interconnect structure 30. The insulating member 31 can cover at least a portion of the grid line 21 adjacent to the connection point 24 to reduce the contact area between the interconnect structure 30 and the grid line 21, thereby reducing the degree to which the grid line 21 is consumed by the interconnect structure 30. Furthermore, due to the setting of the blocking section 27, the insulating member 31 and the connection point 24 are spaced apart along the first direction A.

[0071] Therefore, by electrically connecting the interconnecting structure 30 to at least the connection point 24 of the connection electrode 20 of the cell 100, the current on the cell body 10 is easily collected and led to the external circuit. By employing the aforementioned cell 100, at least a portion of the end of the grid line 21 near the connection point 24 is higher than the connection point 24, effectively reducing the possibility of grid line 21 breakage, ensuring normal current collection, and ensuring the normal operation of the photovoltaic module. The blocking section 27 of the grid line 21 separates the insulating component 31 from the connection point 24. During the welding process, as the curing temperature rises, it prevents the insulating component 31 from diffusing between the connection point 24 and the interconnecting structure 30, thereby avoiding poor welding between the interconnecting structure 30 and the connection point 24, improving the welding strength between the interconnecting structure 30 and the connection point 24, and enhancing the reliability of the photovoltaic module.

[0072] It should be noted that the insulating member 31 in this application may be an insulating member 31 disposed between the gate line 21 and the interconnect structure member 30 along a third direction C. The insulating member 31 is a first insulating member, and at this time the first insulating member is disposed adjacent to the second gate line portion 23 along the first direction A, and is disposed on the side of the second gate line portion 23 away from the connection point 24. Optionally, for connection electrodes 20 of different polarities, such as the first connection electrode 28 and the second connection electrode 29, the polarities of the currents collected by the first connection electrode 28 and the second connection electrode 29 are different. An insulating member 31 disposed adjacent to the first connection electrode 28 along the second direction B is insulated from the first connection electrode 28. The insulating member 31 is the second insulating member. Optionally, the first insulating member and the second insulating member can be integrally formed. That is, when the insulating member 31 is disposed, the insulating member 31 covers part of the grid line 21 and extends in the second direction B, and is disposed between adjacent first connection electrodes 28 and second connection electrodes 29. That is, when the first connection electrode 28 and the second connection electrode 29 are distributed along the second direction B, they can be insulated by the above-mentioned insulating member 31.

[0073] According to some embodiments of this utility model, such as Figure 2 As shown, the direction extending along the vertical grid line 21 is the second direction B. The length of the blocking section 27 is L1, and the length of the insulating member 31 is L2. L1 and L2 satisfy: L2≤L1≤2L2, where 0.2mm≤L1≤2mm.

[0074] When the length of the blocking segment 27 along the second direction B is less than the length of the insulating component 31 along the second direction B, the length of the blocking segment 27 along the second direction B is too small. During the welding process, the insulating component 31 may flow from both ends of the blocking segment 27 along the second direction B to the connection point 24. When the length of the blocking segment 27 along the second direction B is greater than twice the length of the insulating component 31 along the second direction B, the length of the blocking segment 27 along the second direction B is too large, which may increase the cost of the slurry. For example, L1 = 1.5L2.

[0075] Therefore, by limiting the relationship between the length of the blocking segment 27 along the second direction B and the length of the insulating component 31 along the second direction B, the insulating component 31 is prevented from flowing from both ends of the blocking segment 27 along the second direction B to the connection point 24, thereby improving the reliability and stability of the welding between the connection point 24 and the interconnection structure 30. At the same time, production costs are reduced and the reliability of the photovoltaic module is improved.

[0076] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0077] In the description of this utility model, "first feature" and "second feature" may include one or more of the features. In the description of this utility model, "multiple" means two or more. In the description of this utility model, "above" or "below" the second feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. In the description of this utility model, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0079] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A type of battery cell, characterized in that, include: The battery cell itself; A connecting electrode is disposed on at least one side surface of the battery cell body. The connecting electrode includes a grid line and a connection point. The grid line and the connection point are electrically connected. The height of the connection point in the thickness direction of the battery cell body is H1. The distance between at least a portion of the grid line on the side surface away from the battery cell body and the at least one side surface of the battery cell body is H2. H1 and H2 satisfy: H1 < H2 ≤ 5H1.

2. The battery cell according to claim 1, characterized in that, H1 and H2 further satisfy: 1μm≤H2-H1≤18μm.

3. The battery cell according to claim 1, characterized in that, The H2 further satisfies: 3μm≤H2≤20μm.

4. The battery cell according to claim 1, characterized in that, The gate lines include: The distance between the first grid line portion and the side surface of the first grid line portion away from the battery cell body and the at least one side surface of the battery cell body is H3; The distance between the second grid line portion and the surface of the second grid line portion away from the battery cell body and the at least one surface of the battery cell body is H4, wherein H3 and H4 satisfy: H4 > H3.

5. The battery cell according to claim 4, characterized in that, The first grid line portion has one side surface adjacent to the battery cell body connected to at least one side surface of the battery cell body, and the first grid line portion is electrically connected to the connection point; The second grid line portion is connected to the side surface of the first grid line portion away from the battery cell body, and at least one of the second grid line portion and the connection point is integrally formed with the first grid line portion.

6. The battery cell according to claim 4, characterized in that, The side surface of the first grid line portion away from the cell body is flush with the side surface of the connection point away from the cell body.

7. The battery cell according to any one of claims 1-6, characterized in that, At least one groove is formed on the surface of at least a portion of the grid line on the side away from the cell body.

8. The battery cell according to claim 7, characterized in that, The groove divides the grid line into multiple grid line segments, and the groove is located on the side of at least one of the grid line segments away from the connection point.

9. The battery cell according to claim 8, characterized in that, The grid line segment closest to the connection point is a blocking segment. The distance between the side surface of the blocking segment away from the battery cell body and the at least one side surface of the battery cell body is H5, wherein H1 and H5 satisfy: H1 < H5 ≤ 4H1.

10. The battery cell according to claim 9, characterized in that, The length of the blocking segment along the extension direction perpendicular to the grid line is L, where L satisfies: 0.2mm ≤ L ≤ 2mm; and / or, The width of the blocking segment along the extension direction of the grid line is W, and W satisfies: 0.1mm≤W≤1mm.

11. The battery cell according to claim 9, characterized in that, The blocking section is made of conductive metal, carbon, or conductive polymer materials.

12. The battery cell according to claim 7, characterized in that, The distance between the bottom wall of the groove and at least one side surface of the battery cell body is H6, wherein H2 and H6 satisfy: H6 < H2.

13. The battery cell according to claim 7, characterized in that, There are multiple grooves, and the multiple grooves are arranged at intervals along the extension direction of the grid line.

14. The battery cell according to claim 7, characterized in that, The connecting electrode includes a first connecting electrode and a second connecting electrode, which are alternately arranged along a direction perpendicular to the grid line, and the first connecting electrode and the second connecting electrode are located on the same side in the thickness direction of the cell body.

15. A photovoltaic module, characterized in that, include: The battery cell is a battery cell according to any one of claims 1-14; An interconnecting structure, wherein the interconnecting structure is electrically connected at least to the connection point of the connecting electrode of the battery cell; An insulating element is disposed between the grid line of the connecting electrode and the interconnect structure, wherein a blocking segment of the grid line separates the insulating element from the connection point.

16. The photovoltaic module according to claim 15, characterized in that, Along the direction perpendicular to the grid line, the length of the blocking segment is L1, and the length of the insulating element is L2. L1 and L2 satisfy: 1 / 2L2≤L1≤L2, where 0.2mm≤L1≤2mm.

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