Solar cell and photovoltaic module

Abstract

The utility model discloses a solar cell and a photovoltaic assembly, the surface of a substrate of the solar cell is provided with a plurality of grid line electrodes, each grid line electrode comprises a plurality of fine grid lines arranged at intervals along a first direction, and the polarities of two adjacent fine grid lines are opposite; the fine grid lines are provided with conductive connecting parts; along the first direction, the plurality of conductive connection parts of the plurality of fine grid lines with the same polarity form conductive connection groups, and the plurality of columns of conductive connection groups are arranged at intervals along the second direction; the solar cell further comprises a plurality of insulating pieces covering the area where the conductive connecting sets are located, and gaps exist between the insulating pieces and the conductive connecting parts. In the thickness direction of the substrate, the thickness of the insulating part is smaller than that of the conductive connecting part. The thickness of the insulating part is lower than that of the conductive connecting part, so that the possibility that the welding strip is influenced by the insulating part when being connected with the conductive connecting part is reduced, and the overall working efficiency of the solar cell is improved.

Description

[Technical field]

[0001] The utility model relates to the technical field of photovoltaic components, in particular to a solar cell and a photovoltaic component. [Background technology]

[0002] The back-contact battery concentrates the front electrode grid lines and PN junction of the battery cell on the back side, reducing the obstruction of the front grid lines of the battery cell, having a higher photon impact conversion area, and improving the conversion efficiency of the battery cell.

[0003] Since the electrodes of the back-contact battery are designed in a forked-finger shape, short circuits often occur during welding. To solve this problem, related technologies often add an insulating structure, but this structure will affect the contact between the soldering ribbon and the soldering point, resulting in empty solder joints during welding; this will affect the overall working efficiency of the back-contact battery. [Contents of the utility model]

[0004] The main purpose of the utility model is to provide a solar cell, aiming to improve the overall working efficiency of the solar cell.

[0005] To achieve the above object, the utility model provides a solar cell, wherein the surface of the substrate of the solar cell comprises a plurality of grid line electrodes, the grid line electrodes comprise a plurality of thin grid lines spaced apart along a first direction, and the polarities of two adjacent thin grid lines are opposite; the thin grid lines are provided with a conductive connection portion;

[0006] Along the first direction, the plurality of conductive connection portions of the plurality of fine grid lines of the same polarity form a conductive connection group, and a plurality of columns of the conductive connection groups are arranged at intervals along the second direction;

[0007] The solar cell further comprises a plurality of insulating members covering the area where the conductive connection group is located, and there are gaps between the insulating members and the conductive connection part;

[0008] Along the thickness direction of the substrate, the thickness of the insulating member is lower than the thickness of the conductive connecting portion.

[0009] In an embodiment of the present invention, the height of the insulating member along the thickness direction is M mm, and the height of the conductive connecting portion along the thickness direction is N mm, satisfying the relationship: 1 mm ≤ (NM) ≤ 2 mm.

[0010] In one embodiment of the present invention, the two insulating members are respectively distributed on two opposite sides of the conductive connection group;

[0011] Alternatively, the insulating member is extended along the second direction, and a projection of the distance between two adjacent conductive connection portions of one conductive connection group in the thickness direction coincides with a portion of the insulating member.

[0012] In one embodiment of the utility model, the gate line electrode further comprises a plurality of main gate lines extending along a first direction, two adjacent main gate lines have opposite polarities, and the fine gate line is electrically connected to the main gate lines with the same polarity;

[0013] The conductive connection portion is arranged at the intersection of the main grid line and the fine grid line of the same polarity; one end of the insulating member extends to cover one end of the fine grid line close to the main grid line of opposite polarity.

[0014] In one embodiment of the utility model, the insulating member is extended along the second direction. In the second direction, the distance between one end of the fine grid line close to the main grid line and the main grid line with opposite polarity is L1, and the straight-line distance between one side of the insulating member close to the main grid line and the main grid line is L2, satisfying the relationship: 3 / 10≤L2 / L1≤7 / 10.

[0015] In one embodiment of the present invention, the two insulating members are respectively distributed on two opposite sides of the main grid line;

[0016] Alternatively, the insulating member is extended along the second direction and covers the main grid line, and is spaced apart from the conductive connection portion.

[0017] In one embodiment of the present invention, a groove is provided on the surface of the substrate, and at least part of the fine gate wire is embedded in the groove of the substrate; the protruding height of the fine gate wire on the substrate is less than the thickness of the insulating member.

[0018] In an embodiment of the present invention, the insulating member is insulating glue, and the insulating glue is arranged in an arc shape or a streamline shape.

[0019] The utility model also proposes a photovoltaic module, which includes the above-mentioned solar cell, a front packaging structure, a back packaging structure and an adhesive film, and a plurality of solar cells are connected in series into a battery string through welding ribbons; the front packaging structure and the back packaging structure are arranged on two opposite sides of the solar cell for packaging the solar cell; the adhesive film is used to bond the front packaging structure and the back packaging structure.

[0020] In an embodiment of the present invention, the photovoltaic assembly further comprises a plurality of welding strips extending along the first direction, and the plurality of welding strips are connected to the fine grid lines or the main grid lines of the solar cell through the conductive connection parts.

[0021] In an embodiment of the present invention, the actual length of the welding strip between any two adjacent conductive connection parts on the main grid line of the solar cell is greater than its projected length along the thickness direction.

[0022] In one embodiment of the present invention, there is a gap between the lowest point of the welding strips at two adjacent conductive connection parts and the insulating member; and the gap is arranged in a curved shape.

[0023] After adopting the above technical solution, the beneficial effect is as follows: in the solar cell provided by the utility model, multiple fine grid lines are closely arranged, and the distance between multiple fine grid lines and the distance between the conductive connection parts on adjacent fine grid lines are relatively close; in the welding process between the solar cell and the welding strip, the welding strip has the possibility of contacting the fine grid lines with opposite polarity, thereby causing a short circuit of the solar cell, so the utility model also provides an insulating member, by covering the area where the welding strip is located with the insulating member, and the insulating member is arranged between the two conductive connection parts; such an arrangement can effectively reduce the possibility of contacting the fine grid lines with opposite polarity during the welding process of the welding strip with the conductive connection part, and effectively prevent the occurrence of short circuit phenomenon of the solar cell during the welding process. At the same time, in order to maintain the stability of the welding strip and the conductive connection part during the welding process, it is necessary to reduce the influence of the insulating member on the welding strip and the conductive connection part, so the utility model sets the thickness of the conductive connection part to be higher than the height of the insulating member along the thickness direction of the substrate; in this way, the welding strip and the conductive connection part can be stably and quickly welded during the welding process, which is conducive to improving the working efficiency of the solar cell.

Brief Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0025] Figure 1 A side view of a solar cell provided by an embodiment of the utility model;

[0026] Figure 2 A schematic diagram of the structure of a solar cell provided in Embodiment 1 of the present utility model;

[0027] Figure 3 for Figure 2 A in the enlarged view;

[0028] Figure 4 A schematic diagram of the structure of a solar cell provided in Embodiment 2 of the present utility model;

[0029] Figure 5 for Figure 4 The enlarged view of point B in the figure;

[0030] Figure 6 A schematic diagram of the structure of a solar cell provided in Embodiment 3 of the present utility model;

[0031] Figure 7 for Figure 6 The enlarged view of point C in the figure;

[0032] Figure 8 A schematic diagram of the structure of a solar cell provided in Embodiment 4 of the present utility model;

[0033] Fig. 9 for Figure 8 The enlarged view of D in the figure;

[0034] Fig.10 A side view of the connection between the soldering ribbon provided in an embodiment of the utility model and the conductive connecting portion of a solar cell.

[0035] Description of Figure Numbers:

[0036] Label name Label name 100 Solar Cells 10 substrate 20 Gate electrode 21 Fine grid lines 22 Main grid line 23 Conductive connection 24 Conductive connection group 30 Insulation 200 Welding Strip [Specific implementation method]

[0037] In order to better understand the technical solution of the present utility model, the embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0038] It should be clear that the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0039] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0040] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0041] The solar cell proposed in the utility model can be a back-contact solar cell, that is, the positive and negative metal electrodes are arranged on the back of the substrate to reduce the shielding of the grid lines on the front of the cell, thereby improving the conversion efficiency of the cell. A plurality of solar cells are connected in series through welding strips to form a cell string. Since the grid line electrodes with opposite polarities are usually adjacent and closely arranged, it is easy for the welding strip to be welded to the welding points with opposite polarities at the same time during the welding process, so that the cell often short-circuits, affecting the working efficiency of the solar cell.

[0042] The existing technology is to use a printer to apply insulating glue on the grid line by screen printing, and then solidify the insulating glue on the surface of the cell by heating. This method has high requirements on the accuracy of the screen and the printing position of the glue, and the insulating glue and the solder joint are easy to contact during printing, which will cause empty soldering between the solder strip and the solder joint during welding, and will also affect the working efficiency of the solar cell.

[0043] The following is a detailed description with reference to the accompanying drawings and specific embodiments.

[0044] Figure 1 A side view of a solar cell provided by an embodiment of the utility model; Figure 2 A schematic diagram of the structure of a solar cell provided in Embodiment 1 of the present utility model; Figure 3 for Figure 2 Enlarged view of point A in .

[0045] The utility model provides a solar cell 100, wherein the surface of a substrate 10 of the solar cell 100 includes a plurality of grid line electrodes 20, the grid line electrodes 20 include a plurality of fine grid lines 21 spaced apart along a first direction, and the polarities of two adjacent fine grid lines 21 are opposite; the fine grid lines 21 are provided with conductive connection parts 23; along the first direction, a plurality of conductive connection parts 23 of a plurality of fine grid lines 21 of the same polarity form a conductive connection group 24, and a plurality of columns of conductive connection groups 24 are spaced apart along a second direction; the solar cell 100 further includes a plurality of insulating members 30 covering the area where the conductive connection group 24 is located, and there are gaps between the insulating members 30 and the conductive connection parts 23; along the thickness direction of the substrate 10, the thickness of the insulating members 30 is lower than the thickness of the conductive connection parts 23.

[0046] like Figures 1 to 3 As shown, in the first embodiment of the utility model, the solar cell 100 is a back contact cell without a main grid. In this embodiment, a plurality of fine grid lines 21 are arranged on the substrate 10 at intervals along the first direction. Preferably, the spacing between adjacent fine grid lines 21 is consistent. In this arrangement, light can be more evenly distributed and absorbed by the substrate 10, thereby improving the overall light absorption efficiency of the back contact cell.

[0047] Each fine grid line 21 is extended along the second direction, and the polarities of adjacent fine grid lines 21 are opposite, and a plurality of conductive connection parts 23 are provided on the fine grid lines 21; the conductive connection parts 23 of a plurality of fine grid lines 21 of the same polarity arranged along the first direction form a column of conductive connection groups 24, and the plurality of columns of conductive connection groups 24 are arranged at intervals along the second direction; a plurality of welding strips 200 weld the plurality of columns of conductive connection groups 24 of a plurality of solar cells 100 to form a battery string.

[0048] Reference Figure 2 and Figure 3In the present embodiment, the solar cell 100 further includes a plurality of insulating members 30, wherein an insulating member 30 is arranged in parallel with a conductive connection group 24, and an insulating member 30 basically covers the area where a conductive connection group 24 is located, wherein two insulating members 30 are respectively distributed on opposite sides of the conductive connection group 24; in order to ensure good conductivity of the conductive connection portion 23, there is a gap between the insulating member 30 and the conductive connection portion 23, such an arrangement can effectively reduce the possibility of the welding strip 200 contacting the fine grid line 21 of opposite polarity during the welding process with the conductive connection portion 23, and effectively prevent the occurrence of short circuit of the solar cell 100 during the welding process.

[0049] In order to solve the technical problem that "empty welding occurs between the welding ribbon 200 and the welding point, resulting in reduced working efficiency of the solar cell 100", refer to Figure 1 In this embodiment, the thickness of the insulating member 30 is lower than the thickness of the conductive connection portion 23 along the thickness direction of the substrate 10, and the height difference between the insulating member 30 and the conductive connection portion 23 is increased, thereby reducing the influence of the insulating member 30 during the welding process of the welding ribbon 200 and the conductive connection group 24, reducing the occurrence of empty welding between the welding ribbon 200 and the conductive connection portion 23, thereby improving the working efficiency of the solar cell 100.

[0050] In the present invention, the insulating member 30 may be a hot-melt insulating film or an insulating glue; the insulating member 30 may be made of polyvinyl chloride or rubber, or other materials with insulating properties, which are not limited here.

[0051] Furthermore, in this embodiment, the insulating member 30 is an insulating glue. Figure 1 It can be seen that at this time, the insulating part 30 is arranged in an arc shape, and the straight-line distance from the farthest point of the insulating part 30 from the substrate 10 to the substrate 10 is Nmm, and the straight-line distance from the farthest point of the conductive connection part 23 (which can also be understood as a soldering point) from the substrate 10 to the substrate 10 is Mmm, and the two satisfy the relationship: 1mm≤(NM)≤2mm.

[0052] It can be understood that the height difference between the conductive connection part 23 and the insulating part 30 ranges from 1mm to 2mm; illustratively, the height difference (NM) between the conductive connection part 23 and the insulating part 30 can be 1mm, 1.1mm, 1.2mm, 1.5mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc., and of course it can also be any value within this height difference range, which is not limited here.

[0053] If the height difference between the conductive connection part 23 and the insulating member 30 is less than 1 mm, the distance between the insulating member 30 and the conductive connection part 23 is too small. During the welding process of the welding ribbon 200 and the conductive connection group 24, the welding ribbon 200 may contact the insulating member 30 and the conductive connection part 23 at the same time, thereby making the connection between the welding ribbon 200 and the conductive connection group 24 unstable, which will affect the working efficiency of the solar cell 100; if the height difference between the conductive connection part 23 and the insulating member 30 is greater than 2 mm, the distance between the insulating member 30 and the conductive connection part 23 is too large, and the insulating member 30 may not completely cover the fine grid lines 21 with opposite polarity next to the area where the conductive connection part 23 is located. Then, during the welding process of the welding ribbon 200 and the conductive connection group 24, if the welding ribbon 200 is offset, it is very easy to contact the fine grid lines 21 with opposite polarity, thereby connecting the two fine grid lines 21 with opposite polarity, causing a short circuit in the solar cell 100.

[0054] When the height difference between the conductive connection part 23 and the insulating member 30 is within the range of the present embodiment, the insulating member 30 can cover the fine grid line 21 adjacent to the conductive connection group 24 to insulate it, and reduce the possibility of the soldering tape 200 directly contacting the insulating member 30 during soldering, thereby improving the welding quality between the soldering tape 200 and the conductive connection group 24, thereby improving the working efficiency of the solar cell 100.

[0055] Of course, in other embodiments of the present invention, the insulating member 30 may also be provided in a streamlined shape, which is not limited here.

[0056] In some embodiments of the utility model, in order to increase the height difference between the fine gate line 21 and the conductive connecting portion 23, and to increase the contact area between the fine gate line 21 and the PN junction provided on the substrate 10 to reduce the resistance; a groove is provided on the surface of the substrate 10, and at least a portion of the fine gate line 21 is embedded in the groove of the substrate 10; the protruding height of the fine gate line 21 on the substrate 10 is less than the thickness of the insulating member 30 to achieve the above-mentioned effect.

[0057] It is known that the grooves can be provided on the substrate 10 by laser grooving.

[0058] Figure 4 A schematic diagram of the structure of a solar cell provided in Embodiment 2 of the present utility model; Figure 5 for Figure 4 Enlarged view of point B in .

[0059] Reference Figure 4 and Figure 5 In the second embodiment of the present invention, the insulating member 30 is extended along the second direction, and the projection of the distance between two adjacent conductive connection parts 23 of a conductive connection group 24 in the thickness direction coincides with a portion of the insulating member 30 .

[0060] In this embodiment, an insulating member 30 is disposed between two adjacent conductive connecting portions 23 on a thin gate line 21. Figure 5 It can be seen that a space for printing an insulating member 30 is formed between two adjacent conductive connecting portions 23 on a fine grid line 21 and two adjacent conductive connecting portions 23 on a conductive connection group 24; the insulating member 30 can separate the conductive connecting portions 23 of the fine grid lines 21 with opposite polarities to reduce the possibility of the soldering ribbon 200 causing a short circuit in the solar cell 100 during the soldering process.

[0061] In this embodiment, there may be a gap between an insulating member 30 and a plurality of insulating members 30 adjacent to it at a diagonal line, or there may be a partial overlap, which is not limited here.

[0062] Figure 6 A schematic diagram of the structure of a solar cell provided in Embodiment 3 of the present utility model; Figure 7 for Figure 6 Enlarged view of point C in Figure 6 and Figure 7 In the third embodiment of the utility model, the gate line electrode 20 includes a main gate line 22 and a fine gate line 21, and the plurality of gate line electrodes 20 are arranged in a staggered manner in a finger-like cross-shaped form. The main gate line 22 extends along a first direction, and the fine gate line 21 extends along a second direction. The polarities of two adjacent main gate lines 22 are opposite, and the fine gate line 21 is electrically connected to the main gate line 22 with the same polarity; the conductive connecting portion 23 is arranged at the intersection of the main gate line 22 and the fine gate line 21 with the same polarity.

[0063] In this embodiment, the fine grid lines 21 are used to guide current, and the main grid lines 22 are used to collect and aggregate the current conducted by multiple fine grid lines 21. The welding strip 200 is connected to the conductive connecting part 23 arranged at the intersection of the fine grid lines 21 and the main grid lines 22 to lead out the current at the main grid lines 22.

[0064] Reference Figure 7 It can be known that the interval between the end of the fine grid line 21 close to the main grid line 22 with the opposite polarity and this main grid line 22 is smaller, so in the present embodiment, one end of the insulating member 30 is extended to cover the end of the fine grid line 21 close to the main grid line 22 with the opposite polarity; such a setting can make the insulating member 30 cover the end of the fine grid line 21 close to the main grid line 22 as much as possible, thereby reducing the possibility of the fine grid line 21 and the main grid line 22 with the opposite polarity being connected through the welding strip 200, so as to improve the working stability and efficiency of the solar cell 100.

[0065] Furthermore, the two insulating members 30 are respectively distributed on opposite sides of the main gate line 22, and the insulating members 30 are extended along the second direction. In the second direction, with the main gate line 22 having the opposite polarity to the fine gate line 21 as a reference, the distance between one end of the fine gate line 21 close to the main gate line 22 and the main gate line 22 is L1, and the distance between one side of the insulating member 30 close to the main gate line 22 and the main gate line 22 is L2, and the two satisfy: 3 / 10≤L2 / L1≤7 / 10.

[0066] It is understandable that the insulating member 30 is closer to the main grid line 22 than the thin grid line 21. Such a configuration can reduce the possibility of the welding strip 200 being connected to the main grid line 22 and the thin grid line 21 of opposite polarity at the same time, so as to reduce the possibility of short circuit of the solar cell 100. Exemplarily, the ratio (L2 / L1) of the spacing between the insulating member 30 and the main grid line 22 and the spacing between the thin grid line 21 and the main grid line 22 can be 3 / 10, 4 / 10, 5 / 10, 6 / 10, 7 / 10, and of course can be any value within the range of this ratio, which is not limited here.

[0067] If the ratio of the spacing between the insulating member 30 and the main grid line 22 and the spacing between the fine grid line 21 and the main grid line 22 is less than 3 / 10, on the one hand, it may be because the area of ​​the fine grid line 21 covered by the insulating member 30 is small, and it is difficult to ensure the insulation effect; on the other hand, it may be because the length of the insulating member 30 in the second direction is too large, so that it consumes too much material, resulting in a waste of cost.

[0068] If the ratio of the distance between the insulating member 30 and the main grid line 22 and the distance between the thin grid line 21 and the main grid line 22 is greater than 7 / 10, the insulating member 30 is difficult to cover the end of the thin grid line 21 close to the main grid line 22, which will affect the insulation effect.

[0069] When the ratio of the spacing between the insulating member 30 and the main gate line 22 and the spacing between the fine gate line 21 and the main gate line 22 are within the range values ​​set in this embodiment, the insulating member 30 can cover the end of the fine gate line 21 close to the main gate line 22 to maintain the insulation effect; at the same time, the length of the insulating member 30 in the second direction can meet the insulation requirements of the fine gate line 21 without being too large to increase the production cost of the insulating member 30.

[0070] Figure 8 A schematic diagram of the structure of a solar cell provided in Embodiment 4 of the present utility model; Fig. 9 for Figure 8 Enlarged view of point D in Figure 8 and Fig. 9 In the fourth embodiment of the present utility model, the insulating member 30 is extended along the second direction and covers the main grid line 22 , and is spaced apart from the conductive connection portion 23 .

[0071] In this embodiment, a space for printing the insulating member 30 is formed between two adjacent conductive connecting portions 23 on a main grid line 22 and two conductive connecting portions 23 on two adjacent main grid lines 22 with opposite polarities. In this way, the insulating member 30 can separate the conductive connecting portions 23 on the main grid lines 22 with opposite polarities to reduce the possibility of the soldering ribbon 200 causing a short circuit in the solar cell 100 during the soldering process.

[0072] It is understandable that there may be intervals between the multiple insulating members 30 , or there may be overlapping portions, which is not limited here.

[0073] The utility model also proposes a photovoltaic module, which includes the above-mentioned solar cell 100, a front packaging structure, a back packaging structure and an adhesive film. A plurality of solar cells 100 are connected in series into a cell string through a welding ribbon 200; the front packaging structure and the back packaging structure are arranged on two opposite sides of the solar cell 100, and are used to encapsulate the solar cell 100; the adhesive film is used to bond the front packaging structure and the back packaging structure.

[0074] The present application also provides a photovoltaic module, which includes a battery string, which is formed by electrically connecting multiple solar cells 100 through welding strips 200. The film component can cover the two opposite sides of the solar cell 100 respectively, and the film can be an organic packaging film such as ethylene-vinyl acetate copolymer (EVA) film, polyethylene octene co-elastomer (POE) film or polyethylene terephthalate (PET) film; the front packaging structure and the back packaging structure can be glass cover plates, plastic cover plates, or other cover plates with light-transmitting function; the surfaces of the front packaging structure and the back packaging structure facing the film can be concave and convex surfaces, thereby increasing the utilization rate of incident light.

[0075] The specific structure of the photovoltaic module refers to the above embodiments. Since the photovoltaic module of this solution adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0076] In an embodiment of the present invention, the photovoltaic module further includes a plurality of welding strips 200 extending along the first direction, and the plurality of welding strips 200 are connected to the fine grid lines 21 or the main grid lines 22 of the solar cell 100 through the conductive connection parts 23 .

[0077] In this embodiment, the multiple welding strips 200 included in the photovoltaic module respectively achieve electrical connection with the fine grid lines 21 or the main grid lines 22 through contact with multiple columns of conductive connection groups 24, and then achieve electrical connection with the solar cell 100, thereby facilitating the transmission of carriers collected by the multiple fine grid lines 21.

[0078] Fig.10A side view of the connection between the soldering ribbon provided in the embodiment of the utility model and the conductive connection group 24 of the solar cell.

[0079] In the related art, during the welding process between the welding ribbon 200 and the welding point, the materials of the welding ribbon 200 and the grid electrode 20 are inconsistent, so that the thermal expansion coefficients of the two are different, and the stress is too large after welding, which can easily cause the solar cell 100 to warp. At the same time, the thinner the solar cell 100, the greater the warping, which is not conducive to controlling the production cost of the solar cell 100.

[0080] For this purpose, refer to Fig.10 In one embodiment of the present invention, the actual length of the welding strip 200 between any two adjacent conductive connecting parts 23 on the main grid line 22 of the solar cell 100 is greater than its projected length along the thickness direction.

[0081] In this embodiment, along the first direction, the actual length of the soldering strip 200 between two adjacent conductive connection parts 23 is greater than its projected length along the thickness direction. It can be understood that the soldering strip 200 between two adjacent conductive connection parts 23 is arranged in a curved shape.

[0082] Through the above arrangement, a deformation margin can be provided to the soldering ribbon 200 when it shrinks after soldering, thereby preventing the soldering ribbon 200 from being stretched as a whole and reducing the possibility of warping of the solar cell 100 after soldering.

[0083] It can be known that in order to maintain the stability of the transmission current of the welding strip 200, a gap exists between the lowest point of the welding strip 200 at two adjacent conductive connection parts 23 and the insulating member 30 to avoid contact between the welding strip 200 and the insulating member 30.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the above embodiments, a person skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the utility model.

Claims

1. A solar cell, characterized in that: The substrate surface of the solar cell includes a plurality of grid line electrodes, the grid line electrodes include a plurality of thin grid lines spaced apart along a first direction, and the polarities of two adjacent thin grid lines are opposite; the thin grid lines are provided with conductive connecting portions; Along the first direction, the plurality of conductive connection portions of the plurality of fine grid lines of the same polarity form a conductive connection group, and a plurality of columns of the conductive connection groups are arranged at intervals along the second direction; The solar cell further comprises a plurality of insulating members covering the area where the conductive connection group is located, and there are gaps between the insulating members and the conductive connection part; Along the thickness direction of the substrate, the thickness of the insulating member is lower than the thickness of the conductive connecting portion.

2. The solar cell according to claim 1, wherein: The height of the insulating part along the thickness direction is M mm, and the height of the conductive connection part along the thickness direction is N mm, satisfying the relationship: 1 mm ≤ (NM) ≤ 2 mm.

3. The solar cell according to claim 1, wherein: The two insulating members are respectively distributed on two opposite sides of the conductive connection group; Alternatively, the insulating member is extended along the second direction, and a projection of the distance between two adjacent conductive connection portions of one conductive connection group in the thickness direction coincides with a portion of the insulating member.

4. The solar cell according to claim 1, wherein: The gate line electrode further comprises a plurality of main gate lines extending along a first direction, two adjacent main gate lines have opposite polarities, and the fine gate line is electrically connected to the main gate lines with the same polarity; The conductive connection portion is arranged at the intersection of the main grid line and the fine grid line of the same polarity; one end of the insulating member extends to cover one end of the fine grid line close to the main grid line of opposite polarity.

5. The solar cell according to claim 4, characterized in that The insulating member is extended along the second direction. In the second direction, the distance between one end of the fine grid line close to the main grid line and the main grid line with opposite polarity is L1, and the straight-line distance between one side of the insulating member close to the main grid line and the main grid line is L2, satisfying the relationship: 3 / 10≤L2 / L1≤7 / 10.

6. The solar cell according to claim 4, characterized in that The two insulating members are respectively distributed on two opposite sides of the main grid line; Alternatively, the insulating member is extended along the second direction and covers the main grid line, and is spaced apart from the conductive connection portion.

7. The solar cell according to claim 1, wherein: A groove is provided on the surface of the substrate, and at least part of the fine gate line is embedded in the groove of the substrate; the protruding height of the fine gate line on the substrate is less than the thickness of the insulating member.

8. The solar cell according to claim 1, wherein: The insulating member is insulating glue, and the insulating glue is arranged in an arc shape or a streamline shape.

9. A photovoltaic module, characterized in that: The photovoltaic module comprises: A plurality of solar cells according to any one of claims 1 to 8, wherein the plurality of solar cells are connected in series to form a cell string via welding ribbons; A front encapsulation structure and a back encapsulation structure, wherein the front encapsulation structure and the back encapsulation structure are disposed on two opposite sides of the solar cell and are used to encapsulate the solar cell; and An adhesive film is used to bond the front packaging structure and the back packaging structure.

10. The photovoltaic module according to claim 9, characterized in that: The photovoltaic assembly further includes a plurality of welding strips extending along a first direction, and the plurality of welding strips are connected to the fine grid lines or the main grid lines of the solar cell through the conductive connection parts.

11. The photovoltaic module according to claim 10, characterized in that: The actual length of the welding strip between any two adjacent conductive connection parts on the main grid line of the solar cell is greater than its projected length along the thickness direction.

12. The photovoltaic module according to claim 10, characterized in that: There is a gap between the lowest point of the welding strips at two adjacent conductive connection parts and the insulating member; and the welding strips are arranged in a curved shape.

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