Solar cell and solar cell module

Abstract

The utility model discloses a solar cell and a solar cell module, relates to the technical field of solar cells, and aims to solve the problem that the welding reliability of the finally obtained solar module is reduced due to concentrated distribution of welding stress on a plurality of bonding pads with different polarities. The solar cell comprises a cell body, a collector electrode and a bonding pad. The collector electrodes are formed on the battery body, the plurality of collector electrodes extend along a first direction and are distributed at intervals along a second direction, and the first direction is different from the second direction. The plurality of bonding pads are arranged on the battery body at intervals, the bonding pads intersect with the collector electrodes with the same polarity, and the bonding pads comprise first polarity bonding pads and second polarity bonding pads which are distributed at intervals in the first direction. In the second direction, the first distance between the center point of the first polarity bonding pad and the center point of the adjacent second polarity bonding pad is larger than or equal to the second distance between the two adjacent current collection electrodes.

Description

Technical Field

[0001] The utility model relates to the technical field of solar cells, in particular to a solar cell and a solar cell assembly. Background Art

[0002] A solar cell is a semiconductor device that can convert light energy into electrical energy. Specifically, when a solar cell is exposed to light, the semiconductor material included in the solar cell absorbs photons and generates electron-hole pairs. The electron-hole pairs are separated under the action of the built-in electric field of the PN junction, and are respectively led out through the emitter and back field of the solar cell, and finally collected by the electrode structure.

[0003] The solar cell generally includes a battery body, a bus electrode, a collector electrode and a plurality of pads. The center points of the plurality of pads are distributed in an array on the battery body, and the center points of the plurality of pads of different polarities distributed along the row direction are on the same straight line. During the series welding process, the welding strips are respectively welded to the plurality of pads along the length extension direction of the bus electrode. At this time, in the column direction, the center points of the plurality of pads of different polarities have the same coordinates in the column direction, so that the welding stress distribution on the plurality of pads of different polarities is concentrated, resulting in a reduction in the welding reliability of the finally obtained solar module. Utility Model Content

[0004] The utility model aims to provide a solar cell, which is used to reduce the probability of welding stress concentration occurring on the welding pad of the solar cell, so as to ensure the welding reliability of the finally obtained solar cell assembly.

[0005] In order to achieve the above-mentioned purpose, in a first aspect, the utility model provides a solar cell. The solar cell comprises: a battery body, a collector electrode and a pad. The collector electrode is formed on the battery body, and a plurality of collector electrodes extend along a first direction and are spaced apart along a second direction, and the first direction is different from the second direction. A plurality of pads are spaced apart on the battery body, and the pads intersect with the collector electrodes of the same polarity, and the pads comprise a first polarity pad and a second polarity pad spaced apart along the first direction. Along the second direction, a first spacing between a center point of a first polarity pad and a center point of an adjacent second polarity pad is greater than or equal to a second spacing between two adjacent collector electrodes.

[0006] In the solar cell provided by the utility model, along the first direction, the center points of multiple first polarity welding pads are on a straight line (referred to as the first straight line for the convenience of subsequent description). Along the first direction, the center points of multiple second polarity welding pads are on a straight line (referred to as the second straight line for the convenience of subsequent description). Since along the second direction, the first spacing between the center point of the first polarity welding pad and the center point of the adjacent second polarity welding pad is greater than or equal to the second spacing between two adjacent collector electrodes. It can be seen that the first polarity welding pad and the second polarity welding pad are staggered and not facing each other, and the above-mentioned first straight line and second straight line are also staggered. Compared with the prior art, along the first direction, the center points of multiple first polarity welding pads and the center points of the adjacent second polarity welding pads are on the same straight line. In the solar cell provided by the utility model, a straight line in the prior art is divided into at least two straight lines, so that the welding stress on the welding pad in the later stage is dispersed, so as to reduce the probability of welding stress concentration on the welding pad on the solar cell, thereby ensuring the welding reliability of the solar module finally obtained. Furthermore, since the first polarity pad and the second polarity pad are staggered, after the multiple welding strips are respectively welded to the first polarity pad and the second polarity pad, the multiple fastening forces between the welding strips and the battery body are discretely distributed on the surface of the battery body. At this time, not only can the firmness of the connection between the welding strip and the battery body be improved to ensure the yield of the solar cell. At the same time, the multiple discretely distributed fastening force components act on different areas of the battery body, and the multiple component forces cover most of the surface of the battery body, so the probability of deformation of the battery body due to uneven force can be reduced, and then the probability of the collector electrode falling off or poor contact caused by the deformation of the battery body can be reduced, so as to further improve the yield and stability of the solar cell.

[0007] In one implementation, along the second direction, the adjacent second polarity pad has a relative first edge and a second edge; the distance between the first edge and the center point of the first polarity pad in the second direction is greater than the distance between the second edge and the center point of the first polarity pad in the second direction; along the second direction, the first spacing is less than or equal to the minimum distance between the edge of the first polarity pad and the first edge of the adjacent second polarity pad.

[0008] When the above technical solution is adopted, the center point of the first polarity pad and the center point of the adjacent second polarity pad along the second direction are prevented from being too far apart, so as to avoid excessive dispersion of welding stress, thereby ensuring welding reliability. Further, it also provides greater flexibility for pad design.

[0009] In one implementation, along the second direction, the length of the first polarity pad is smaller than the length of the second polarity pad.

[0010] When the above technical solution is adopted, compared with the case where the length of the first polarity pad is greater than or equal to the length of the second polarity pad, not only the manufacturing cost of the first polarity pad is reduced, thereby reducing the total manufacturing cost of the pad, and further reducing the manufacturing cost of the solar cell. At the same time, the shielding of the battery body by the pad is reduced, thereby improving the photoelectric conversion efficiency of the solar cell.

[0011] In one implementation, a straight line passing through the center point of the first polarity pad along the first direction coincides with an extension line of at least one collector electrode. And / or a straight line passing through the center point of the second polarity pad along the first direction coincides with an extension line of at least one collector electrode.

[0012] When the above technical solution is adopted, the graphic appearance is relatively regular, which is convenient for design and adjustment.

[0013] In one implementation, a straight line passing through the center point of the first polarity pad along the first direction is staggered with an extension line of at least one collector electrode. And / or a straight line passing through the center point of the second polarity pad along the first direction is staggered with an extension line of at least one collector electrode.

[0014] When the above technical solution is adopted, the probability of deformation of the battery body due to uneven force can be reduced, and the probability of the collector electrode falling off or poor contact caused by the deformation of the battery body can be reduced, so as to further improve the yield and stability of the solar cell.

[0015] In one implementation, along the second direction, the battery body includes a first edge and a second edge opposite to each other. The first polarity pad includes an edge pad close to the first edge and the second edge, and along the second direction, a third spacing between a center point of the edge pad and a center point of an adjacent second polarity pad is greater than or equal to a second spacing between two adjacent collector electrodes.

[0016] When the above technical solution is adopted, during actual welding, when the welding strip is welded to the first polarity welding pad along the second direction, the two ends of the welding strip are respectively welded to the first polarity welding pad (i.e., edge welding pad) close to the first edge and the second edge. When the welding strip is welded to the second polarity welding pad along the second direction, the two ends of the welding strip are respectively welded to the second polarity welding pad close to the first edge and the second edge. At this time, the edge welding pad and the second polarity welding pad close to the edge of the battery body are most affected by the welding stress. Therefore, when the third spacing between the center point of the edge welding pad and the center point of the adjacent second polarity welding pad along the second direction is greater than or equal to the second spacing between two adjacent collecting electrodes, the edge welding pad is staggered with the second polarity welding pad close to the edge of the battery body, so that the welding stress on the later welding pad is dispersed, so as to reduce the probability of welding stress concentration on the welding pad on the solar cell, thereby ensuring the welding reliability of the solar module finally obtained.

[0017] In one implementation, along the first direction, the battery body includes a third edge and a fourth edge relative to each other; the first polarity welding pad includes an edge welding pad close to the third edge and the fourth edge, and an intermediate welding pad away from the third edge and the fourth edge; along the second direction, a fourth spacing between a center point of the edge welding pad and a center point of an adjacent second polarity welding pad is greater than or equal to a second spacing between two adjacent collecting electrodes.

[0018] The two side edges (the third edge and the fourth edge) of the battery cell are greatly affected by welding stress. When the above technical solution is adopted, the solution provided by the utility model can improve the stability and reliability of welding of the two side edges of the battery cell.

[0019] In one implementation, along the second direction, a first spacing between center points of all first polarity pads and center points of all second polarity pads is greater than or equal to a second spacing between two adjacent collector electrodes.

[0020] When the above technical solution is adopted, all the first polarity welding pads and all the second polarity welding pads are staggered. At this time, in the actual welding process, the probability of welding stress concentration in the solar cell can be further reduced to ensure the welding reliability of the final solar module.

[0021] In one implementation, along the first direction, the battery body includes a third edge and a fourth edge opposite to each other, the first polarity pad includes an edge pad close to the third edge and the fourth edge, and the collector electrode connected to the second polarity pad adjacent to the edge pad has a bent section.

[0022] The bending section is located between the edge pad and the third edge or the fourth edge. When the above technical solution is adopted, the above bending section fully utilizes the blank area on the battery body, increases the number of collector electrodes included in the solar cell, improves the current collection capacity, and thus improves the efficiency of the solar cell.

[0023] And / or, an edge pad has only one bending section on one side along the second direction. In the case of adopting the above technical solution, compared with the case where both sides of an edge pad have multiple bending sections, the number of bending sections is reduced in the utility model, which not only reduces the processing difficulty caused by the difficulty in printing the bending sections, but also improves the printing efficiency. At the same time, it also reduces the probability of broken printing when printing the bending sections, improves the printing quality of the collector electrode, and thus improves the quality of the solar cell. Furthermore, it also saves the production cost of the collector electrode, thereby reducing the production cost of the solar cell.

[0024] And / or, along the second direction, the adjacent second polarity pad has a first edge and a second edge relative to each other. The distance between the first edge and the center point of the first polarity pad in the second direction is greater than the distance between the second edge and the center point of the first polarity pad in the second direction. The extension line of the bending section extending along the first direction is located between the first edge and the second edge, and the extension line of the bending section is close to the second edge. When the above technical solution is adopted, the bending of the printed collector electrode can be effectively reduced, the consumption of slurry can be reduced, and the production cost of the battery can be reduced.

[0025] In one implementation, the first polarity pad is a negative pad, and the second polarity pad is a positive pad; along the second direction, the length of the first polarity pad is smaller than the length of the second polarity pad.

[0026] In a second aspect, the utility model further provides a solar cell assembly, comprising a welding ribbon and the solar cell described in the above technical solution, wherein the welding ribbon is connected to the welding pad along the second direction.

[0027] Compared with the prior art, the beneficial effects of the solar cell assembly provided by the utility model are the same as the beneficial effects of the solar cell described in the above technical solution, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0029] Figure 1 It is a schematic diagram of a part of the structure of a solar cell in the prior art;

[0030] Figure 2 The schematic diagram of the partial structure of the first solar cell in the embodiment of the utility model is as follows Figure 1 ;

[0031] Figure 3 The schematic diagram of the partial structure of the first solar cell in the embodiment of the utility model is as follows Figure 2 ;

[0032] Figure 4 The partial structure of the second solar cell in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0033] Figure 5 The partial structure of the second solar cell in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0034] Figure 6 It is a schematic diagram of the structure of a solar cell in the prior art.

[0035] Reference numerals:

[0036] 1-battery body, 10-first edge, 11-second edge, 12-third edge, 13-fourth edge; 2-collector electrode, 20-bending section; 3-welding pad, 30-first polarity welding pad, 31-second polarity welding pad, 310-first edge, 311-second edge, 32-edge welding pad, 33-middle welding pad, 34-edge welding pad. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined. The meaning of "several" is one or more, unless otherwise clearly and specifically defined.

[0040] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0041] In the description of the present utility model, 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 an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0042] See also Figure 1 In the prior art, the solar cell generally includes a battery body, a bus electrode, a collector electrode 2 and a plurality of pads 3. The center points of the plurality of pads 3 are distributed in an array on the battery body, and the center points of the plurality of pads 3 of different polarities distributed along the row direction are on the same straight line M. During the series welding process, the welding strips are respectively welded to the plurality of pads along the length extension direction of the bus electrode. At this time, in the column direction, the center points of the plurality of pads of different polarities have the same coordinates in the column direction, so that the welding stress distribution on the plurality of pads of different polarities is concentrated, resulting in a reduction in the welding reliability of the finally obtained solar module.

[0043] In order to solve the above technical problems, in the first aspect, the present utility model provides a solar cell. Figures 2 to 5 The solar cell includes: a battery body 1, a collector electrode 2 and a pad. The collector electrode 2 is formed on the battery body 1, and a plurality of collector electrodes 2 extend along a first direction and are spaced apart along a second direction, and the first direction is different from the second direction. A plurality of pads are spaced apart on the battery body 1, and the pads intersect with the collector electrodes 2 of the same polarity, and the pads include a first polarity pad 30 and a second polarity pad 31 spaced apart along the first direction. Along the second direction, a first spacing L1 between a center point of a first polarity pad 30 and a center point of an adjacent second polarity pad 31 is greater than or equal to a second spacing L2 between two adjacent collector electrodes 2 (it should be noted that the attached Figure 2 To Attachment Figure 5 The second spacing indicated in the figure is only used to explain what the second spacing is, and is not used for specific limitation). It should be noted that in the present application, "adjacent" refers to "adjacent" in the first direction, for example Figures 2 to 5 The first polarity pad 30 and the second polarity pad 31 are shown to be in a closely adjacent relationship.

[0044] The structure and specifications of the battery body can be set according to actual conditions and are not specifically limited here. Furthermore, the first direction and the second direction can be any two directions parallel to the surface of the battery body and different from each other. Figures 2 to 5, the first direction A is orthogonal to the second direction B. Preferably, the first direction A is the row direction, and the second direction B is the column direction.

[0045] See also Figure 3 and Figure 5 The first spacing L1 can be specifically understood as: along the first direction A, for the adjacent first polarity pad 30 and the second polarity pad 31. The distance between the center point of the first polarity pad 30 and the center point of the adjacent second polarity pad 31 of the above two types of pads along the second direction B. It should be noted that the center point of the pad is the center point of the geometric shape of the pad.

[0046] See also Figures 2 to 5 In the solar cell provided by the embodiment of the utility model, along the first direction A, the center points of multiple first polarity pads 30 are on a straight line (referred to as the first straight line for the convenience of subsequent description). Along the first direction A, the center points of multiple second polarity pads 31 are on a straight line (referred to as the second straight line for the convenience of subsequent description). Since along the second direction B, the first spacing L1 between the center point of the first polarity pad 30 and the center point of the adjacent second polarity pad 31 is greater than or equal to the second spacing L2 between two adjacent collector electrodes 2. It can be seen that the first polarity pad 30 and the second polarity pad 31 are staggered and not facing each other, and the above-mentioned first straight line and second straight line are also staggered. Compared with the prior art, along the first direction, the center points of multiple first polarity pads 30 and the center points of the second polarity pad 31 are on the same straight line. In the solar cell provided by the embodiment of the utility model, a straight line in the prior art is divided into at least two straight lines, so that the welding stress on the pad in the later stage is dispersed, so as to reduce the probability of welding stress concentration on the pad on the solar cell, thereby ensuring the welding reliability of the solar module finally obtained. Furthermore, since the first polarity pad 30 and the adjacent second polarity pad 31 are staggered, after the multiple welding strips are respectively welded to the first polarity pad 30 and the second polarity pad 31, the multiple fastening forces between the welding strips and the battery body 1 are discretely distributed on the surface of the battery body 1. At this time, not only can the firmness of the connection between the welding strips and the battery body 1 be improved to ensure the yield of the solar cell. At the same time, the multiple discretely distributed fastening force components act on different areas of the battery body 1, and the multiple component forces cover most of the surface of the battery body 1, so that the probability of deformation of the battery body 1 due to uneven force can be reduced, and then the probability of the collector electrode 2 falling off or poor contact caused by the deformation of the battery body 1 can be reduced, so as to further improve the yield and stability of the solar cell.

[0047] As a possible implementation, see Figures 2 to 5, along the second direction B, the adjacent second polarity pad 31 has a relative first edge 310 and a second edge 311; the distance between the first edge 310 and the center point of the first polarity pad 30 in the second direction B is greater than the distance between the second edge 311 and the center point of the first polarity pad 30 in the second direction B; along the second direction B, the first spacing L1 is less than or equal to the minimum distance L3 between the edge of the first polarity pad 30 and the first edge 310 of the adjacent second polarity pad 31.

[0048] At this time, the center point of the first polarity pad 30 and the center point of the adjacent second polarity pad 31 can be prevented from being too far apart in the second direction, so as to avoid excessive dispersion of welding stress, thereby ensuring welding reliability. Further, it also provides greater flexibility for pad design.

[0049] The length relationship between the first polarity pad and the second polarity pad is described below by way of example. It should be understood that the following description is only for understanding and is not intended to be a specific limitation.

[0050] For example, see Figure 2 and Figure 4 , along the second direction B, the length L4 of the first polarity pad 30 is smaller than the length L5 of the second polarity pad 31 .

[0051] When the above technical solution is adopted, compared with the case where the length of the first polarity pad 30 is greater than or equal to the length of the second polarity pad 31, not only the manufacturing cost of the first polarity pad 30 is reduced, thereby reducing the total manufacturing cost of the pad, and further reducing the manufacturing cost of the solar cell. At the same time, the shielding of the pad on the battery body 1 is also reduced, thereby improving the photoelectric conversion efficiency of the solar cell.

[0052] As a possible implementation, see Figure 2 and Figure 3 , a straight line N passing through the center point of the first polarity pad 30 along the first direction A coincides with the extension line of at least one collector electrode 2. And / or a straight line P passing through the center point of the second polarity pad 31 along the first direction A coincides with the extension line of at least one collector electrode 2. When the above technical solution is adopted, the graphic appearance is relatively regular, which is convenient for design and adjustment.

[0053] As another possible implementation, see Figure 4 and Figure 5, a straight line N passing through the center point of the first polarity pad 30 along the first direction A is staggered from the extension line of at least one collector electrode 2. And / or, a straight line P passing through the center point of the second polarity pad 31 along the first direction A is staggered from the extension line of at least one collector electrode 2. When the above technical solution is adopted, the probability of deformation of the battery body due to uneven force can be reduced, and then the probability of the collector electrode falling off or poor contact caused by the deformation of the battery body can be reduced, so as to further improve the yield and stability of the solar cell.

[0054] As a possible implementation, see Figure 6 , along the second direction B, the battery body 1 includes a first edge 10 and a second edge 11 opposite to each other. The first polarity pad 30 includes an edge pad 34 close to the first edge 10 and the second edge 11. Along the second direction B, the third spacing between the center point of the edge pad 34 and the center point of the adjacent second polarity pad 31 is greater than or equal to the second spacing between two adjacent collector electrodes 2. It should be noted that the third spacing here is essentially a special description of the first spacing at another special position. In order to distinguish, the description "third spacing" is used here. Further, the above Figure 6 The schematic diagram of the structure of the solar cell in the prior art is shown in the attached Figure 6 It is only used to assist in understanding the technical solutions described in the embodiments of the present utility model. Figure 6 The technical solution of the embodiment of the utility model is not fully shown in the figure.

[0055] During actual welding, when the welding strip is welded to the first polarity welding pad 30 along the second direction, the two ends of the welding strip are respectively welded to the first polarity welding pad 30 (i.e., the edge welding pad 34) near the first edge 10 and the second edge 11. When the welding strip is welded to the second polarity welding pad 31 along the second direction, the two ends of the welding strip are respectively welded to the second polarity welding pad 31 near the first edge 10 and the second edge 11. At this time, the edge welding pad 34 and the second polarity welding pad 31 near the edge of the battery body 1 are most affected by the welding stress. Therefore, when the third spacing between the center point of the edge welding pad 34 and the center point of the adjacent second polarity welding pad 31 along the second direction is greater than or equal to the second spacing between two adjacent collector electrodes 2, the edge welding pad 34 is staggered with the second polarity welding pad 31 near the edge of the battery body 1, so that the welding stress on the later welding pad is dispersed, so as to reduce the probability of welding stress concentration on the welding pad on the solar cell, thereby ensuring the welding reliability of the solar module finally obtained.

[0056] In an optional manner, along the second direction, the third interval is less than or equal to the minimum distance between the edge of the edge pad 34 and the first edge 310 of the adjacent second polarity pad 31 .

[0057] As a possible implementation, see Figures 2 to 6 , along the first direction A, the battery body 1 includes a third edge 12 and a fourth edge 13 opposite to each other. The first polarity pad 30 includes an edge pad 32 close to the third edge 12 and the fourth edge 13, and an intermediate pad 33 away from the third edge 12 and the fourth edge 13. Along the second direction B, the fourth spacing between the center point of the edge pad 32 and the center point of the adjacent second polarity pad 31 is greater than or equal to the second spacing L2 between two adjacent collector electrodes. It should be noted that the fourth spacing here is essentially a special description of the first spacing at a special position, and the description of "fourth spacing" is used here to distinguish them.

[0058] The two side edges (the third edge and the fourth edge) of the battery cell are greatly affected by welding stress. When the above technical solution is adopted, the stability and reliability of welding on the two side edges of the battery cell can be improved.

[0059] In an optional manner, the straight line passing through the center point of the middle pad 33 along the first direction A coincides with the straight line passing through the center point of the second polarity pad 31 along the first direction A.

[0060] In an alternative approach, see Figures 2 to 6 , along the first direction, the battery body includes a third edge and a fourth edge opposite to each other, and the first polarity pad includes an edge pad close to the third edge and the fourth edge. The collector electrode 2 connected to the second polarity pad 31 adjacent to the edge pad 32 has a bent section 20.

[0061] The bending section 20 is located between the edge pad 32 and the third edge, or the bending section is located between the edge pad and the fourth edge. When the above technical solution is adopted, the bending section 20 makes full use of the blank area on the battery body 1, increases the number of collector electrodes 2 included in the solar cell, improves the current collection capacity, and thus improves the efficiency of the solar cell.

[0062] and / or, see Figures 2 to 5 , an edge pad 32 has a bending section 20 only on one side along the second direction B. When the above technical solution is adopted, compared with the case where both sides of an edge pad 32 have bending sections 20, the number of bending sections 20 is reduced in the embodiment of the utility model, which not only reduces the processing difficulty caused by the difficulty in printing the bending sections 20, but also improves the printing efficiency. At the same time, it also reduces the probability of broken printing when printing the bending sections 20, improves the printing quality of the collector electrode 2, and thus improves the quality of the solar cell. Furthermore, it also saves the production cost of the collector electrode 2, thereby reducing the production cost of the solar cell.

[0063] Exemplarily, along the second direction, the edge pad has a third edge and a fourth edge relative to the first edge, and the distance between the fourth edge and the first edge in the second direction is greater than the distance between the third edge and the first edge in the second direction. When compared to the prior art, the distance between the fourth edge of the edge pad and the second edge of the battery body remains unchanged, and only the length of the edge pad is reduced, the area above the edge pad is vacated, and at this time the collector electrode connected to the second polarity pad can be directly extended to the edge area of ​​the battery body along the first direction without forming a bend. Alternatively, when compared to the prior art, the distance between the third edge of the edge pad and the first edge of the battery body remains unchanged, and only the length of the edge pad is reduced, the area below the edge pad is vacated, and at this time the collector electrode connected to the second polarity pad can be directly extended to the edge area of ​​the battery body along the first direction without forming a bend.

[0064] and / or, see Figures 2 to 5 , along the second direction B, the adjacent second polarity pad 31 has a first edge 310 and a second edge 311 opposite to each other. The extension line of the bending section 20 extending along the first direction A is located between the first edge 310 and the second edge 311, and the extension line of the bending section 20 is close to the second edge 311. It should be noted that along the second direction B, the adjacent second polarity pad 31 has a first edge 310 and a second edge 311 opposite to each other, and the distance between the second edge 311 and the center point of the first polarity pad 30 in the second direction B is less than the distance between the first edge 310 and the center point of the first polarity pad 30 in the second direction B. When the above technical solution is adopted, the bending of the printed collector electrode can be effectively reduced, the consumption of slurry is reduced, and the production cost of the battery can be reduced.

[0065] As a possible implementation manner, along the second direction, a first distance between center points of all first polarity pads and center points of all second polarity pads is greater than or equal to a second distance between two adjacent collector electrodes.

[0066] When the above technical solution is adopted, all the first polarity welding pads and all the second polarity welding pads are staggered. At this time, in the actual welding process, the probability of welding stress concentration in the solar cell can be further reduced to ensure the welding reliability of the final solar module.

[0067] In an optional manner, along the second direction, the lengths of all the first polarity pads are smaller than the lengths of all the second polarity pads.

[0068] Compared with the case where the length of the first polarity pad is greater than or equal to the length of the second polarity pad, not only the manufacturing cost of the first polarity pad is further reduced, thereby further reducing the total manufacturing cost of the pad and further reducing the manufacturing cost of the solar cell, but also further reducing the shielding of the battery body by the pad, further improving the photoelectric conversion efficiency of the solar cell.

[0069] As for the polarity of the above-mentioned first polarity pad and the second polarity pad, they can be set according to actual conditions. Preferably, the first polarity pad is a negative pad, and the second polarity pad is a positive pad; along the second direction B, the length L4 of the first polarity pad 30 is less than the length L5 of the second polarity pad 31. The above technical solution can improve the contact resistance balance of the positive pad and the negative pad of the solar cell, and at the same time reduce the production cost of the negative pad. It should be understood that the slurry for making the above-mentioned pad can be selected according to actual conditions, and the above description is not intended to be specifically limited, as long as it can meet the requirements of increased welding tension, improved contact, current collection or yield. In addition, the above-mentioned first polarity pad and the second polarity pad can be printed and formed at the same time, or they can be printed and formed in batches, which is not specifically limited here.

[0070] In summary, compared with the solar cells in the prior art, the solar cells provided by the embodiments of the utility model have an open circuit voltage increased by 0.4mV-0.9mV, a conversion efficiency increased by 0.02%-0.11%, and a 1sunPL (Photoluminescence) brightness increased by 450photo·cm -2 Up to 580 photos·cm -2 Furthermore, when printing the same number of solar cells, the consumption of the collector electrode paste (eg, silver paste) can be effectively reduced by 25mg-40mg.

[0071] As a possible implementation, the solar cell may be a BC solar cell or other types of solar cells, which are not specifically limited herein.

[0072] In a second aspect, the utility model embodiment further provides a solar cell assembly, comprising a soldering ribbon and the solar cell described in the above technical solution, wherein the soldering ribbon is connected to the soldering pad along the second direction. For example, the soldering ribbon is connected to the first polarity soldering pad or the second polarity soldering pad along the second direction.

[0073] Compared with the prior art, the beneficial effects of the solar cell assembly provided by the embodiment of the utility model are the same as the beneficial effects of the solar cell described in the above technical solution, which will not be described in detail here.

[0074] In the description of the above embodiments, specific features, structures, materials or characteristics may be combined in a suitable manner in any one or more embodiments or examples.

[0075] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the utility model, which should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A solar cell, characterized in that: include: Battery body; A collector electrode is formed on the battery body; a plurality of the collector electrodes extend along a first direction and are spaced apart along a second direction, the first direction being different from the second direction; A welding pad, a plurality of the welding pads are arranged at intervals on the battery body; the welding pads intersect with the collector electrodes with the same polarity; The pads include a first polarity pad and a second polarity pad that are spaced apart and distributed along the first direction; Along the second direction, a first distance between a center point of the first polarity pad and a center point of the second polarity pad adjacent thereto is greater than or equal to a second distance between two adjacent collector electrodes.

2. The solar cell according to claim 1, characterized in that: Along the second direction, the adjacent second polarity pad has a first edge and a second edge opposite to each other; the distance between the first edge and the center point of the first polarity pad in the second direction is greater than the distance between the second edge and the center point of the first polarity pad in the second direction; Along the second direction, the first spacing is less than or equal to a minimum distance between an edge of the first polarity pad and a first edge of the adjacent second polarity pad.

3. The solar cell according to claim 1 or 2, characterized in that: Along the second direction, the length of the first polarity pad is smaller than the length of the second polarity pad.

4. The solar cell according to claim 1 or 2, characterized in that: A straight line passing through the center point of the first polarity pad along the first direction coincides with an extension line of at least one of the collector electrodes; and / or, A straight line passing through a center point of the second polarity pad along the first direction coincides with an extension line of at least one of the collector electrodes.

5. The solar cell according to claim 1 or 2, characterized in that: A straight line passing through the center point of the first polarity pad along the first direction is staggered from an extension line of at least one of the collector electrodes; and / or, A straight line passing through a center point of the second polarity pad along the first direction is offset from an extension line of at least one of the collector electrodes.

6. The solar cell according to claim 1, characterized in that Along the second direction, the battery body includes a first edge and a second edge opposite to each other; The first polarity pad includes an edge pad close to the first edge and the second edge; Along the second direction, a third distance between a center point of the edge pad and a center point of the adjacent second polarity pad is greater than or equal to a second distance between two adjacent collector electrodes.

7. The solar cell according to claim 1, characterized in that Along the first direction, the battery body includes a third edge and a fourth edge opposite to each other; The first polarity pads include edge pads close to the third edge and the fourth edge, and middle pads far from the third edge and the fourth edge; Along the second direction, a fourth distance between a center point of the edge pad and a center point of the adjacent second polarity pad is greater than or equal to a second distance between two adjacent collector electrodes.

8. The solar cell according to claim 1 or 2, characterized in that: Along the second direction, a first distance between center points of all the first polarity pads and center points of all the second polarity pads is greater than or equal to a second distance between two adjacent collector electrodes.

9. The solar cell according to claim 1, characterized in that: Along the first direction, the battery body includes a third edge and a fourth edge opposite to each other, the first polarity pad includes an edge pad close to the third edge and the fourth edge; the collector electrode connected to the second polarity pad adjacent to the edge pad has a bent section; wherein, The bending section is located between the edge pad and the third edge or the fourth edge; And / or, one of the edge pads has only one bending section on one side along the second direction; And / or, along the second direction, the adjacent second polarity pad has a relative first edge and second edge; the distance between the first edge and the center point of the first polarity pad in the second direction is greater than the distance between the second edge and the center point of the first polarity pad in the second direction; the extension line of the bending section extending along the first direction is located between the first edge and the second edge, and the extension line of the bending section is close to the second edge.

10. The solar cell according to claim 1, characterized in that: The first polarity pad is a negative pad, and the second polarity pad is a positive pad; along the second direction, the length of the first polarity pad is smaller than the length of the second polarity pad.

11. A solar cell module, characterized in that: The solar cell comprises a soldering ribbon and the solar cell according to any one of claims 1 to 10, wherein the soldering ribbon is connected to the soldering pad along the second direction.

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