Solar cell and photovoltaic module

Abstract

The invention provides a solar cell and a photovoltaic module. The solar cell comprises a cell body; the main-grid-free region is positioned on one surface of the battery body; the plurality of first collector electrodes and the plurality of second collector electrodes are positioned in the main-grid-free region; the plurality of first current collection electrodes and the plurality of second current collection electrodes extend along a second direction, the plurality of first current collection electrodes and the plurality of second current collection electrodes are alternately arranged at intervals along a first direction, and the first direction is perpendicular to the second direction; the polarities of the first collector electrode and the second collector electrode are opposite; each of the first current collection electrode and the second current collection electrode comprises a plurality of electrode sub-parts and disconnection parts located between the adjacent electrode sub-parts; the electrode sub-parts extend along a second direction; each electrode sub-part is provided with at least one conductive joint part; and at least a connecting line of the two conductive combination parts along the first direction of the adjacent electrode sub-parts with the same polarity penetrates through the electrode sub-parts with the different polarities between the adjacent electrode sub-parts with the same polarity.

Description

Technical Field

[0001] The present application relates to the technical field of solar cells, and in particular to a solar cell and a photovoltaic module. Background Art

[0002] The positive and negative electrodes of the back contact (BC) cell are both placed on the backlight side of the cell, which can effectively reduce the light-shielding area of ​​the light-receiving side, thereby improving the light utilization rate of the solar cell. This makes the back contact cell have a higher short-circuit current and photoelectric conversion efficiency, and is one of the main technical directions for achieving high-efficiency crystalline silicon cells.

[0003] BC batteries mainly collect current from the secondary grid (collecting electrode) through the main grid. The main grid needs to be electrically connected to the like-gender secondary grid on the battery cell and electrically isolated from the opposite-gender secondary grid. Otherwise, the main grid will be connected to the opposite-gender secondary grid to form a short circuit. In order to achieve effective isolation between the main grid and the opposite-gender secondary grid, electrical insulating glue (usually green glue) is usually printed on the part of the opposite-gender secondary grid close to the main grid.

[0004] However, due to the wide width of the main grid, the consumption of green glue is large, resulting in high costs. Summary of the invention

[0005] In view of this, in order to at least partially solve at least one of the above-mentioned technical problems, the present application provides a solar cell and a photovoltaic module.

[0006] According to an embodiment of one aspect of the present application, a solar cell is provided, comprising: a battery body; a main grid-free region, located on a surface of the battery body; and a plurality of first collecting electrodes and a plurality of second collecting electrodes located in the main grid-free region; the plurality of first collecting electrodes and the plurality of second collecting electrodes all extend along the second direction, the plurality of first collecting electrodes and the plurality of second collecting electrodes are alternately arranged along the first direction, and the first direction and the second direction are perpendicular to each other; the first collecting electrode and the second collecting electrode have opposite polarities; the first collecting electrode and the second collecting electrode both include a plurality of electrode sub-sections, and disconnecting portions located between adjacent electrode sub-sections; the electrode sub-sections extend along the second direction; each electrode sub-section is provided with at least one conductive joint portion; there are at least two conductive joint portions of adjacent electrode sub-sections of the same polarity, and a line connecting the two conductive joint portions along the first direction passes through the electrode sub-sections of opposite polarity between the adjacent electrode sub-sections of the same polarity.

[0007] According to an embodiment of another aspect of the present application, a photovoltaic component is provided, comprising a plurality of solar cells as described above; and a plurality of electrical connection lines, the electrical connection lines comprising a first electrical connection line and a second electrical connection line extending along a first direction and arranged alternately and spaced apart in a second direction; an electrode sub-portion of a first collecting electrode is electrically connected to the first electrical connection line via a corresponding conductive joint; an electrode sub-portion of a second collecting electrode is electrically connected to the second electrical connection line via a corresponding conductive joint; each electrical connection line passes through a disconnected portion of a collecting electrode of opposite polarity, or crosses a collecting electrode of opposite polarity via a second insulating portion.

[0008] According to the embodiments of the present application, a main grid-free area is provided, and the collector electrode can be directly electrically connected to the external electrical connection line by welding, without the need for electrical connection through the main grid, thereby saving the use of the main grid, increasing the light receiving area of ​​the solar cell, and further improving the photoelectric conversion efficiency of the solar cell. Since the use of the main grid is saved, it helps to reduce costs. When the insulating glue is subsequently printed, the amount of insulating glue used is reduced, the covering of the reflected light is reduced, and the cost is further reduced. In addition, by arranging the electrode sub-parts in sequence and disconnecting the multiple electrode sub-parts from each other through the disconnecting part, when the collector electrode is connected to the battery body, it helps to reduce the stress on the battery body, improve the bending resistance of the battery body, and thus increase the service life of the solar cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The above and other objects, features and advantages of the present application will become more apparent through the following description of the embodiments of the present application with reference to the accompanying drawings, in which:

[0010] Figure 1 A partial top view of a solar cell provided in an embodiment of the present application is shown;

[0011] Figure 2 A partial top view of a solar cell provided by another embodiment of the present application is shown;

[0012] Figure 3 A partial top view of a solar cell provided in yet another embodiment of the present application is shown;

[0013] Figure 4 A partial top view of a solar cell provided in another embodiment of the present application is shown;

[0014] Figure 5 A partial top view of a first region and a second region of a solar cell provided by an embodiment of the present application is shown;

[0015] Figure 6 A schematic diagram showing an emitter region of a battery body provided in an embodiment of the present application; and

[0016] Figure 7A schematic diagram showing the connection between a solar cell provided in an embodiment of the present application and an external electrical connection line is shown.

[0017] In the drawings, the meanings of the reference numerals are as follows:

[0018] 1. Battery body;

[0019] 11. First side;

[0020] 12. Second side;

[0021] 13. Emitter region;

[0022] 131. a first emitter region;

[0023] 132. a second emitter region;

[0024] 1-0, no main grid area;

[0025] 1-1, first area;

[0026] 1-2, the second area;

[0027] 2. Collecting electrode;

[0028] 21. Disconnection unit;

[0029] 211, a first insulating portion;

[0030] 22. Electrode sub-unit;

[0031] 221, second insulating portion;

[0032] 23. Conductive joint;

[0033] 2-1, first collector electrode;

[0034] 2-2, second current collecting electrode;

[0035] 2-3, first connecting electrode;

[0036] W1, the distance between adjacent conductive bonding parts on the same electrode sub-part;

[0037] W2, width of the conductive bonding portion along the first direction;

[0038] W3, length of the conductive bonding portion along the second direction;

[0039] W4, the distance between adjacent first collector electrodes and second collector electrodes;

[0040] W5, length of the breaking portion along the second direction. DETAILED DESCRIPTION

[0041] Below, embodiments of the present application will be described with reference to the accompanying drawings. However, it should be understood that these descriptions are exemplary only and are not intended to limit the scope of the present application. In the following detailed description, for ease of explanation, many specific details are set forth to provide a comprehensive understanding of the embodiments of the present application. However, it is apparent that one or more embodiments may also be implemented without these specific details. In addition, in the following description, descriptions of known structures and technologies are omitted to avoid unnecessary confusion of the concepts of the present application.

[0042] The terms used herein are only for describing specific embodiments and are not intended to limit the present application. The term "comprising" used herein indicates the existence of features, steps, operations, but does not exclude the existence or addition of one or more other features.

[0043] In the case of using expressions such as "at least one of A, B, and C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, and C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.). In the case of using expressions such as "at least one of A, B, or C, etc.", it should generally be interpreted in accordance with the meaning of the expression generally understood by those skilled in the art (for example, "a system having at least one of A, B, or C" should include but is not limited to a system having A alone, B alone, C alone, A and B, A and C, B and C, and / or A, B, C, etc.).

[0044] In back-contact cells, the current of the secondary grid is mostly collected through the main grid and transmitted to the outside. Since the main grid needs to carry a large current, it needs to be designed to be wider to reduce resistance and power loss. However, due to the wide width of the main grid, the consumption of metal materials is high. When isolating the main grid from the opposite-sex secondary grid, it is usually necessary to print electrical insulating glue between the main grid and the opposite-sex secondary grid, resulting in a large consumption of insulating glue. In addition, the large area of ​​insulating glue printing causes a certain degree of light coverage, which affects the photoelectric conversion efficiency of the battery.

[0045] In the process of realizing the concept of this application, it is found that thinning the electrical insulating glue between the main grid and the opposite-sex secondary grid is not conducive to electrical insulation between the two; that is, if less electrical insulating glue is used, the main grid and the opposite-sex secondary grid may be connected, causing the battery to short-circuit; that is, it is difficult to ensure that the battery has a high conversion efficiency when used when the amount of insulating glue used is reduced. Therefore, this application provides a new solar cell, which reduces the amount of insulating glue used while further improving the conversion efficiency of the battery by improving the setting and distribution structure of the collector electrode.

[0046] Specifically, according to an embodiment of one aspect of the present application, a solar cell is provided. Figure 1 FIG. 4 shows a partial top view of a solar cell provided in an embodiment of the present application, such as Figure 1 As shown, the solar cell of the embodiment of the present application includes: a cell body 1 , a main grid-free region 1 - 0 , and a plurality of collector electrodes 2 .

[0047] The busbar-free region 1-0 is located on a surface of the battery body 1 (such as the backlight surface of the battery body 1, i.e. Figure 1 In general, the front side of the battery body 1 is the light-receiving side, and the back side is the backlight side. Alternatively, the battery body 1 can also be double-sided, in which case both the front side and the back side of the battery body 1 are the light-receiving side. The collector electrode 2 (also called a fine grid, collector grid line, auxiliary grid, etc.) is disposed in a first direction (such as Figure 1 The plurality of emitter regions are arranged alternately with different polarities (used to extract majority carriers or minority carriers from different emitter regions) and along the second direction (as shown in the upper and lower directions). Figure 1 The plurality of collector electrodes 2 include a plurality of first collector electrodes 2-1 and a plurality of second collector electrodes 2-2. The plurality of first collector electrodes 2-1 and the plurality of second collector electrodes 2-2 are located in the main grid-free region 1-0. The plurality of first collector electrodes 2-1 and the plurality of second collector electrodes 2-2 are both extended along the second direction. The plurality of first collector electrodes 2-1 and the plurality of second collector electrodes 2-2 are alternately arranged along the first direction, and the first direction and the second direction are perpendicular to each other. The first collector electrode 2-1 and the second collector electrode 2-2 have opposite polarities. The first collector electrode 2-1 and the second collector electrode 2-2 each include a plurality of electrode sub-sections 22 and a disconnecting section 21 between adjacent electrode sub-sections 22. The electrode sub-sections 22 extend along the second direction, and each electrode sub-section 22 is provided with at least one conductive joint 23. Each electrode sub-section 22 can be electrically connected to an external electrical connection line (also called a welding strip or an interconnecting strip, used to connect at least two solar cells in series) of the same polarity through the conductive joint 23. There is at least one connecting line of two conductive bonding portions 23 of adjacent electrode sub-portions 22 of the same polarity along the first direction that passes through the electrode sub-portions 22 of opposite polarity between the adjacent electrode sub-portions 22 of the same polarity.

[0048] According to the embodiments of the present application, the solar cell of the present application can be a back contact heterojunction (Heterojunction Back Contac, referred to as HBC) cell, a TBC (TopCon-Back Contact) cell, a hybrid HBC cell such as a hybrid cell combined with TBC (TopCon-Back Contact)-HJT (Heterojunction with Intrinsic Thin-layer, referred to as HJT), etc.

[0049] Furthermore, the solar cell of the present application may be a solar cell of the present invention. Figure 1 The structure without main grid (OBB) is shown. That is, the electrode sub-portion 22 is directly connected to the external electrical connection line by welding without passing through the bus electrode (also called main grid). It can also be understood that at the disconnection portion 21, there is no bus electrode with opposite polarity to the collector electrode.

[0050] The cell body 1 of the solar cell at least includes a substrate and an emitter region on the substrate, wherein the substrate is a rectangular or square structure. The substrate may be, for example, a semiconductor material selected from monocrystalline silicon, polycrystalline silicon or microcrystalline silicon, and may further be an N-type or P-type monocrystalline silicon substrate. The cell conversion efficiency based on the monocrystalline silicon substrate is higher than that of other types such as polycrystalline silicon cells. By introducing donor impurities such as VA group elements such as phosphorus (P), arsenic (As) or antimony (Sb) into these semiconductor materials, an N-type crystalline silicon substrate is obtained, or by introducing acceptor impurities such as IIIA group elements such as boron (B), aluminum (Al) or gallium (Ga) into these semiconductor materials, a P-type crystalline silicon substrate is obtained.

[0051] In some embodiments of the present application, the electrode sub-portions 22 in the first collecting electrode 2-1 and the second collecting electrode 2-2 can be made of metal (such as Ag, Cu, Al, Ni, Au, Zn, Sn, Pb, silver-clad copper, etc.), conductive metal oxides (various TCOs, such as ITO, AZO, IWO, etc.), metal nitrides (TiN, etc.), metal carbides (TiC, etc.), or metal sulfides, etc., as well as other conductive connecting materials (such as graphene, etc.), or various combinations of the above materials.

[0052] Furthermore, the electrode sub-part 22 can be made of metal electrodes by printing, electrodeposition, etc. Optionally, the metal paste can be printed on the battery body 1, and then the metal paste is sintered to achieve metallization. The printing method can be, for example, screen printing or inkjet printing, and the low-cost screen printing method can be further selected.

[0053] In some embodiments of the present application, a conductive bonding portion 23 (for example, it can be solder, solder paste, such as solder, used to weld the electrode sub-portion 22 and the solder strip; it can also be a conductive adhesive layer, such as conductive silver paste, conductive glue, etc., used to conductively bond the electrode sub-portion 22 and the solder strip, and can also be understood as a pad, based on which the electrode sub-portion 22 and the solder strip are welded together through the above-mentioned solder, solder paste or conductive adhesive layer) is arranged between the electrode sub-portion 22 and the electrical connection line of the same polarity, so that the electrode sub-portion 22 and the electrical connection line of the same polarity have a good connection relationship.

[0054] According to the embodiment of the present application, since the use of the main grid is saved, the main grid is directly connected to the electrode sub-section 22 through the electrical connection wire, thereby reducing the shading loss of the main grid. Accordingly, since the electrical connection wire is thinner than the main grid, the use of insulating glue is reduced, further reducing the shading loss of the insulating glue, and improving the photoelectric conversion efficiency of the solar cell.

[0055] In some embodiments of the present application, there are at least two conductive joints 23 on at least one electrode sub-part 22. When the electrode sub-part 22 and the electrical connection line are welded through the conductive joint 23, since misalignment and cold welding may occur during the conventional welding process between the electrode sub-part 22 and the electrical connection line, the welding yield of the electrode sub-part 22 between a single conductive joint 23 and the electrical connection line is about 90-95%. For example, on an electrode sub-part 22, the connection between one of the conductive joints 23 and the external electrical connection line fails, and the other conductive joints 23 on the same electrode sub-part 22 can also improve the reliability of the connection and ensure the collection of the current of the corresponding area on the battery body 1 corresponding to the electrode sub-part 22. When the conductive joints 23 on at least one electrode sub-part 22 are adjusted to the above number, the welding yield between at least one electrode sub-part 22 and the electrical connection line reaches 99% or more, further improving the connection reliability between the electrode sub-part 22 and the electrical connection line, and thus improving the current collection efficiency of the electrical connection line for the battery.

[0056] For ease of understanding, in one embodiment, Figure 1As shown, the disconnected portion 21 of the first collecting electrode 2-1 and the conductive bonding portion 23 of the second collecting electrode 2-2 adjacent to the first direction are arranged correspondingly along the first direction, and the corresponding arrangement can be understood as that along the first direction, the geometric center of the disconnected portion 21 of the first collecting electrode 2-1 and the geometric center of the conductive bonding portion 23 of the adjacent second collecting electrode 2-2 are located on a common straight line; and / or the disconnected portion 21 of the second collecting electrode 2-2 and the conductive bonding portion 23 of the first collecting electrode 2-1 adjacent to the first direction are arranged correspondingly along the first direction, and the corresponding arrangement can be understood as that along the first direction, the geometric center of the disconnected portion 21 of the second collecting electrode 2-2 and the geometric center of the conductive bonding portion 23 of the adjacent first collecting electrode 2-1 are located on a common straight line.

[0057] Along the first direction, by arranging the geometric center of each disconnect portion 21 and the geometric center of the conductive connecting portion 23 of the adjacent electrode sub-portion 22 of opposite polarity on a common straight line, when the electrical connecting line crosses between the electrode sub-portions 22 of different polarities, the amount of insulating glue used near the disconnect portion 21 is correspondingly reduced, thereby further reducing the shading loss of the insulating glue and improving the photoelectric conversion efficiency of the solar cell.

[0058] In another embodiment, Figure 2 FIG. 2 shows a partial top view of a solar cell provided by another embodiment of the present application. Figure 2As shown, along the first direction, the disconnection portion 21 of the first collector electrode 2-1 is staggered with the disconnection portion 21 of the first collector electrode 2-1 adjacent to the first direction. The staggered setting can be understood as when observed along the first direction, the disconnection portion 21 of a first collector electrode 2-1 will not be on the same straight line as the disconnection portion 21 on the adjacent collector electrode of the same polarity, but have a certain offset from each other. It can also be understood that when observed from the first direction, the projection areas of the two disconnections 21 in this direction do not intersect, and have a relatively clear spatial separation. And / or, the disconnection portion 21 of the second collector electrode 2-2 is staggered with the disconnection portion 21 of the second collector electrode 2-2 adjacent to the first direction. The staggered setting can be understood as when observed along the first direction, the disconnection portion 21 of a second collector electrode 2-2 will not be on the same straight line as the disconnection portion 21 on the adjacent collector electrode of the same polarity, but have a certain offset from each other. It can also be understood as when observed from the first direction, the projection areas of the two disconnections 21 in this direction do not intersect, and have a relatively clear spatial separation. It should be noted that when one of the conductive bonding parts 23 is misaligned or has a cold weld, due to the intersection of the electrical connection line and the electrode sub-part 22 (which may be perpendicular to each other), the electrical connection line extending in the first direction and the corresponding other electrode sub-parts 22 of the same polarity may also be misaligned or have a cold weld. Based on the staggered arrangement of the geometric centers of the disconnecting parts 21 of adjacent collector electrodes 2 with the same polarity, even if a poor connection occurs between a certain electrical connection line and the electrode sub-part 22, the other conductive bonding parts 23 on the same electrode sub-part 22 can maintain the reliability of the connection, thereby reducing the possibility of poor connection of the entire electrode sub-part 22 and improving the current collection efficiency.

[0059] In yet another embodiment, Figure 2 As shown, the conductive joint 23 of each first collector electrode 2-1 is provided with an electrode sub-portion 22 of the second collector electrode 2-2 adjacent to the side on one side along the first direction, and a disconnection portion 21 of the second collector electrode 2-2 adjacent to the side on the other side; it can also be understood that the conductive joint 23 of each second collector electrode 2-2 is provided with an electrode sub-portion 22 of the first collector electrode 2-1 adjacent to the side on one side along the first direction, and a disconnection portion 21 of the first collector electrode 2-1 adjacent to the side on the other side. By arranging the disconnection portions 21 and the electrode sub-portions 22 corresponding to the two sides of the conductive joint 23 as described above, it is helpful to sequentially displace the electrode sub-portions 22 of the first collector electrode 2-1 and the second collector electrode 2-2, thereby improving the reliability of the connection with the electrical connection line, reducing the probability of poor connection, and improving the current collection efficiency.

[0060] In another embodiment, two conductive bonding parts 23 are arranged on each electrode sub-section 22 at intervals along the second direction. It can be understood that when two conductive bonding parts 23 are arranged on the electrode sub-section 22, the failure rate of the connection can be reduced by two orders of magnitude (it can be understood that the failure rate is reduced by 100 times), and at the same time, there will be no waste of materials and complexity in preparation due to the arrangement of too many conductive bonding parts 23. While ensuring the reliability of the connection, cost control is taken into account to avoid unnecessary waste of resources. Along the first direction, in the adjacent electrode sub-sections 22 with opposite polarities, one conductive bonding part 23 of one electrode sub-section 22 is located between two adjacent conductive bonding parts 23 of another electrode sub-section 22. There are two conductive bonding parts 23 on one electrode sub-section 22, and the geometric center of one of the conductive bonding parts 23 is arranged between two adjacent conductive bonding parts 23 of the other electrode sub-section 22 with opposite polarity, preferably on the vertical midline of the two adjacent conductive bonding parts 23. The geometric center of another conductive joint 23 corresponds to the disconnection portion 21 between the electrode sub-parts 22 with opposite polarities, so that the electrode sub-parts 22 can better collect current through the conductive joint 23 while reducing the use of insulating materials and reducing costs.

[0061] According to an embodiment of the present application, Figure 3 FIG. 4 shows a partial top view of a solar cell provided in another embodiment of the present application. Figure 3 As shown, the first collector electrode 2-1 is located in the N-type region of the battery body 1, and the second collector electrode 2-2 is located in the P-type region of the battery body 1; or the first collector electrode 2-1 is located in the P-type region of the battery body 1, and the second collector electrode 2-2 is located in the N-type region of the battery body 1. Figure 3 The positions of the first collector electrode 2-1 and the second collector electrode 2-2 are only schematically shown, and are not to be construed as a special limitation on their positions. The N-type region and the P-type region are different local surfaces on the surface, which can correspond to different carrier collection areas, which are specifically determined by the emitter region set thereon and its extension method.

[0062] In some embodiments of the present application, the surface of the battery body 1 has a first side 11 and a second side 12 opposite to each other along a second direction. The solar cell further includes: a first connecting electrode 2-3 extending along the first direction and close to the first side 11, the first connecting electrode 2-3 connecting at least two electrode sub-portions 22 of the first collector electrode 2-1; and / or a second connecting electrode (not shown in the figure), extending along the first direction and close to the second side 12, the second connecting electrode connecting at least two electrode sub-portions 22 of the second collector electrode. Specifically, Figure 3As shown on the left side of the figure (shown for example only), the first connecting electrode 2-3 is arranged between the electrode sub-parts 22 of the same polarity near the first side 11. This allows a single electrode sub-part 22 that may appear near the edge of the battery cell to also have two conductive bonding parts 23, thereby improving the welding yield between the electrode sub-part 22 and the electrical connection line and ensuring the reliability of the connection between the two. Figure 3 As shown on the right side of the figure, if the second connecting electrode is not provided, the electrode sub-portions 22 with the same polarity close to the second edge 12 respectively have a conductive connecting portion 23. When the above-mentioned cold solder joints or misaligned positions occur, the current at the corresponding electrode sub-portion 22 may be difficult to collect due to poor welding, and it is difficult to improve the local current collection efficiency.

[0063] It should be noted that Figure 3 This is only an example and does not mean that the first connecting electrode 2-3 is only arranged on the left side. The first connecting electrode 2-3 can be separately arranged on the first side 11 along the second direction close to the battery body 1, or separately arranged on the second side 12 along the second direction close to the battery body 1 as needed, which will not be repeated here.

[0064] In another embodiment, the first connecting electrode 2-3 is disposed near the first side 11 and the second side 12, the first connecting electrode 2-3 near the first side 11 is connected to the electrode sub-portion 22 of the first collector electrode 2-1, and the second connecting electrode near the second side 12 is connected to the electrode sub-portion 22 of the second collector electrode 2-2. It can be understood that Figure 3 As shown, the connecting electrodes are symmetrically arranged on both sides of the battery body 1 along the second direction. The first connecting electrode 2-3 and the second connecting electrode with opposite polarities extend along the first direction and are respectively close to the opposite first side 11 and the second side 12. The first connecting electrode 2-3 is electrically connected to the two first collector electrodes 2-1 with the same polarity close to the first side 11, and the second connecting electrode is electrically connected to the two second collector electrodes 2-2 with the same polarity close to the second side 12. Of course, the polarities of the above two connecting electrodes can also be replaced, which is not particularly limited here.

[0065] In yet another embodiment, Figure 4 FIG. 2 shows a partial top view of a solar cell provided by another embodiment of the present application. Figure 4 As shown, it can be understood that based on Figure 3For the reason of approximation, the first connecting electrode 2-3 is suitable for electrically connecting multiple electrode sub-sections 22 of multiple first collecting electrodes 2-1 with the same polarity, and / or the second connecting electrode is suitable for electrically connecting multiple electrode sub-sections 22 of multiple second collecting electrodes 2-2 with the same polarity. For example, the multiple sub-sections can be set to 3, 4, 5, 6, 7, 8, 9, 10, 11 or 12 according to actual production needs, and are not particularly limited here.

[0066] Optionally, multiple electrode sub-sections 22 with the same polarity can be electrically connected through the first connecting electrode 2-3 on the side of the solar cell near the first side 11. For the effectiveness of collecting current and the aesthetics of the surface of the battery body 1, it is also possible to consider setting the first connecting electrode 2-3 and the second connecting electrode near the opposite first side 11 and the second side 12 respectively. For example, assuming that the surface of the solar cell has 20 collecting electrodes 2, including 10 first collecting electrodes 2-1 and 10 second collecting electrodes 2-2, for example, the first side 11 (for example, the second side 12) of the solar cell along the second direction can be connected to the first connecting electrode 2-3 and the second connecting electrode can be set to the first connecting electrode 2-3 and the second connecting electrode can be set to the second connecting electrode 2-2. Figure 4 The first connecting electrode 2-3 is provided to electrically connect the electrode sub-portions 22 of the ten first collector electrodes 2-1 close to the first side 11, and at the other end along the second direction (for example, Figure 4 A second connecting electrode with opposite polarity is provided to electrically connect the electrode sub-portions 22 of the 10 second collecting electrodes 2-2 close to the second edge 12, thereby further reducing the local current collection problem caused by poor welding and further improving the local current collection efficiency.

[0067] According to an embodiment of the present application, Figure 5 FIG. 1 shows a partial top view of the first region 1-1 and the second region 1-2 of the solar cell provided by the embodiment of the present application. Figure 5 As shown, the main grid-free region 1-0 includes a first region 1-1 and a second region 1-2, wherein the second region 1-2 extends along the second direction and is located on a side of the first region 1-1 close to the edge of the solar cell along the first direction. It can be understood that the first region 1-1 can be the main region of the solar cell, and the second region 1-2 can be understood as the edge region of the solar cell. Please refer to Figure 4 , the size of the conductive joint 23 located in the first area 1-1 is smaller than the size of the conductive joint 23 located in the second area 1-2. It can be understood that the larger the size of the conductive joint 23, the more it can improve the connection yield between the electrode sub-part 22 and the external electrical connection line. The first area 1-1 and the second area 1-2 of the solar cell are divided into zones, and the size of the conductive joint 23 in the edge area (second area 1-2) is designed to be larger than that in the main area (first area 1-1), so that the edge current of the battery body 1 can be more fully collected.

[0068] In another embodiment, the length of the disconnected portion 21 located in the first region 1-1 extending along the second direction is less than or equal to the length of the disconnected portion 21 located in the second region 1-2 extending along the second direction. Setting the length of the disconnected portion 21 in the second region 1-2 to be longer is more conducive to the electrical isolation between the electrode sub-portion 22 and the electrical connection line of different polarities when the electrode sub-portion 22 is subsequently electrically connected to the electrical connection line, avoiding the short circuit formed by the mutual connection between the two, and improving the collection efficiency of the edge current.

[0069] It should be noted that Figure 5 It is mainly shown schematically and does not mean to limit the length of the break portion 21 extending along the second direction.

[0070] In some embodiments of the present application, the solar cell further includes a main grid region (not shown in the figure) located on a surface of the battery body 1; the main grid region is located on one side of the first region 1-1 close to the edge of the battery cell along the first direction; the main grid segment (also referred to as a busbar electrode or main grid) is arranged in the main grid region, and the main grid segment is electrically connected to the same polarity electrode sub-portion 22 and electrically isolated from the opposite polarity electrode sub-portion 22. The electrical isolation between the main grid segment and the opposite polarity electrode sub-portion 22 may include: the opposite polarity electrode sub-portion 22 covered by the main grid segment at the extension area along the first direction is disconnected, or the opposite polarity electrode sub-portion 22 is not disconnected, and an insulating layer is used to isolate and arrange between the main grid segment and the opposite polarity electrode sub-portion 22 for electrical insulation. The main grid segment arranged at the above position helps to more fully collect the edge current of the battery body 1.

[0071] In an exemplary embodiment, the material of the main gate segment includes but is not limited to silver, copper, silver-clad copper, etc.

[0072] According to an embodiment of the present application, along the first direction, the geometric centers of the conductive joints 23 of the plurality of electrode sub-parts 22 having the same polarity are located on a common straight line. Figure 1~Figure 5 As shown, the geometric centers of the conductive joints 23 on the multiple electrode sub-parts 22 are set on a common straight line. When laying the electrical connection wires, it is helpful to align the geometric centers of the multiple conductive joints 23, reduce the impact of the electrical connection wires being offset, and is more conducive to direct welding of the electrical connection wires in the first direction. In addition, when welding, the height difference in the thickness direction of the conductive joints 23 is reduced to avoid the electrical connection wires from fluctuating up and down, thereby affecting the electrical connection effect between the electrical connection wires and the electrode sub-parts 22, avoiding the risk of poor contact or short circuit, and improving the reliability of the solar cell.

[0073] In some embodiments of the present application, along the first direction, the plurality of conductive joints 23 corresponding to the plurality of first collector electrodes 2-1 are divided into a first conductive joint and a second conductive joint, and the first conductive joint and the second conductive joint have different sizes in the second direction; along the first direction, the first conductive joint and the second conductive joint are arranged alternately; and / or, along the first direction, the plurality of conductive joints 23 corresponding to the plurality of second collector electrodes 2-2 are divided into a third conductive joint and a fourth conductive joint, and the third conductive joint and the fourth conductive joint have different sizes in the second direction; along the first direction, the third conductive joint and the fourth conductive joint are arranged alternately. For example, the first conductive joint and the third conductive joint can be designed to be relatively large, and the second conductive joint and the fourth conductive joint can be designed to be relatively small, or the sizes of the above conductive joints can be interchanged. This allows the reliability of the connection to be ensured while reducing the consumption of materials used in the conductive joint 23 and reducing costs. If the first conductive joint, the second conductive joint, the third conductive joint and the fourth conductive joint are all designed to be larger in size, it will cause waste of materials and make the cost higher; if the first conductive joint, the second conductive joint, the third conductive joint and the fourth conductive joint are all designed to be smaller in size, it may cause multiple conductive joints 23 to be poorly welded, making it difficult to collect current in local areas of the battery body 1.

[0074] In some embodiments of the present application, the projection of the conductive bonding portion 23 on the surface is surrounded by at least one of a straight line and an arc, and the width W2 of the conductive bonding portion 23 along the first direction is 30~6000μm, for example, it can be 30μm, 50μm, 80μm, 100μm, 150μm, 200μm, 500μm, 1000μm, 2000μm, 3000μm, 4000μm, 5000μm or 6000μm; the length W3 of the conductive bonding portion 23 along the second direction is 30~6000μm, for example, it can be 30μm, 50μm, 80μm, 100μm, 150μm, 200μm, 500μm, 1000μm, 2000μm, 3000μm, 4000μm, 5000μm or 6000μm. When the width and length of the conductive bonding portion 23 are respectively set within the above ranges, it is helpful to improve the reliability of subsequent connection with the electrical connection line.

[0075] Optionally, the width W2 of the conductive bonding part 23 along the first direction is 50~1000μm, and the length W3 of the conductive bonding part 23 along the second direction is 50~4000μm. When the width and length of the conductive bonding part 23 are respectively set within the above ranges, it is possible to save the use of raw materials while ensuring good subsequent connection with the electrical connection line. Optionally, the projection of the conductive bonding part 23 on the surface is one of a rectangle, a square, a rectangle with chamfers, or a square with chamfers. It is understood that having chamfers means that the four corners of the rectangle or square are chamfered. When the conductive bonding part 23 is projected on the surface as a rectangle or a rectangle with chamfers, continue as Figure 2 As shown, the width W2 of the conductive bonding part 23 along the first direction is 50-200 μm, for example, it can be 50 μm, 80 μm, 100 μm, 150 μm or 200 μm, and the length W3 of the conductive bonding part 23 along the second direction is 200-1000 μm, for example, it can be 200 μm, 400 μm, 500 μm, 600 μm, 800 μm or 1000 μm. When the length and width and the projection shape of the conductive bonding part 23 are respectively set in the above ranges, it is helpful to save the material usage of the conductive bonding part 23 while ensuring the connection reliability between the electrode sub-part 22 and the electrical connection line, saving costs, and reducing the shielding effect of the conductive bonding part 23 on light, thereby improving the photoelectric conversion efficiency of the solar cell.

[0076] Furthermore, the sizes of the first conductive bonding portion and the second conductive bonding portion, and the third conductive bonding portion and the fourth conductive bonding portion located on the same electrode sub-portion 22 may be, for example, that the width W2 of the larger conductive bonding portion 23 along the first direction is 50~200μm, and the length W3 along the second direction is 600~1000μm; the width W2 of the smaller conductive bonding portion 23 along the first direction is 50~200μm, and the length W3 along the second direction is 400~800μm.

[0077] In some embodiments of the present application, the distance W1 between adjacent conductive joints 22 on the same electrode sub-part 22 is 5-40 mm, for example, 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm or 40 mm. Setting W1 within the above range helps to more fully collect the local current on the battery body 1.

[0078] In some embodiments of the present application, along the first direction, the spacing W4 between the adjacent first collector electrodes 2-1 and the second collector electrodes 2-2 is 0.2-2mm, for example, 0.2mm, 0.5mm, 1mm, 1.5mm or 2mm. Setting W4 in the above range helps to achieve the isolation state between the adjacent first collector electrodes 2-1 and the second collector electrodes 2-2, avoid the current short circuit phenomenon, and improve the reliability of the battery.

[0079] According to an embodiment of the present application, the battery body 1 further includes an emitter region 13, Figure 6 A schematic diagram of the emitter region 13 of the battery body provided in the embodiment of the present application is shown, Figure 6 As shown, the emitter region 13 can be understood as a patterned layer structure, and the battery body 1 includes a first emitter region 131 corresponding to the first collector electrode 2-1, and a second emitter region 132 corresponding to the second collector electrode 2-2; the first emitter region 131 and the second emitter region 132 are continuous at the disconnection portion 21. The doping types of the first emitter region 131 and the second emitter region 132 are opposite, for example, the first emitter region 131 may be N-type doped, and the second emitter region 132 may be P-type doped; or the first emitter region 131 may be P-type doped, and the second emitter region 132 may be N-type doped.

[0080] Furthermore, N-type doping can be achieved, for example, by introducing donor impurities such as phosphorus (P), arsenic (As) or antimony (Sb) and other VA group elements into the semiconductor material; P-type doping can be achieved by introducing acceptor impurities such as boron (B), aluminum (Al) or gallium (Ga) and other IIIA group elements into the aforementioned semiconductor material. Furthermore, the materials of the first emitter region 131 and the second emitter region 132 can each independently include semiconductor materials such as amorphous silicon, polycrystalline silicon or microcrystalline silicon.

[0081] The first emitter region 131 and the second emitter region 132 can be prepared in a sequence as needed. The preparation of the two can be done by diffusion, ion implantation or laser doping. This application uses laser doping as an example. The dopant is first deposited on the surface of the battery body 1, and then the selected area is irradiated with a laser beam. The energy of the laser allows the dopant to be quickly integrated into the semiconductor material, so that the doping process proceeds smoothly.

[0082] It should be noted that the first collector electrode 2-1 of the present application is located on the first emitter region 131, and is used to collect carriers of the first emitter region 131; the second collector electrode 2-2 is located on the second emitter region 132, and is used to collect carriers of the second emitter region 132. The first emitter region 131 and the second emitter region 132 are respectively distributed continuously along the second direction. In the related art, a main gate of different polarities usually passes through the position of the disconnection portion 21 located in the first emitter region 131, so the second emitter region 132 needs to be made under the disconnection portion 21 of the first emitter region 131. When laser doping is performed, since different dopants need to be doped in a row of laser operations along the second direction, and the energies corresponding to different dopants are different, it is necessary to turn on, stop, and then turn on the laser during the doping process, and in the related art, since N-type doping and P-type doping appear alternately on the battery body 1 corresponding to a row of collector electrodes 2, a certain degree of defective rate may occur at the start and stop positions due to inaccurate laser positioning. Based on the above reasons, in the related art, it usually takes more than 50ms to use laser to complete the operation of a row of emitter regions on the battery body 1. However, in the present application, the first emitter region 131 and the second emitter region 132 are respectively distributed continuously in the disconnection portion 21, which reduces the start and stop time in the laser doping process, so that the time to use laser to complete the operation of a row of emitter regions 13 on the battery body 1 is about 15ms, which greatly improves the production efficiency. In addition, since the present application uses laser for continuous doping, the defect rate that may occur at the start and stop positions is reduced.

[0083] It should be noted that, on the surface of the battery body 1 , the doping patterns of the first emitter region 131 and / or the second emitter region 132 can be matched with the distribution positions of the electrode sub-parts 22 as required, and are not particularly limited here.

[0084] According to an embodiment of the present application, the battery body 1 may further include a first interface passivation layer, located between the substrate and the first emitter region 131; and a second interface passivation layer, located between the substrate and the second emitter region 132. The first interface passivation layer and the second interface passivation layer may be composed of one layer or multiple layers, respectively, or may be composed of different materials in different regions, and the optional materials may include one or more of silicon nitride, silicon oxide, silicon oxynitride, aluminum oxide, silicon carbide, and amorphous silicon.

[0085] According to some embodiments of the present application, exemplarily, the first interface passivation layer may be a silicon oxide layer, the first emitter region 131 may be a doped polysilicon layer, and the first interface passivation layer and the first emitter region 131 form a tunneling oxide passivation contact structure; at this time, the second interface passivation layer may form a similar tunneling oxide passivation contact structure with the second emitter region 132, and the corresponding back contact battery is a TBC battery.

[0086] According to some embodiments of the present application, the solar cell further includes a surface passivation layer, which is located on the other surface of the battery body 1. The surface passivation layer may include one or more layers of aluminum oxide, silicon nitride, and silicon oxynitride, such as a stack of aluminum oxide and silicon nitride. For example, an aluminum oxide passivation layer may be first prepared by atomic layer deposition, and then one or more silicon nitride layers may be formed on the surface of the silicon oxide passivation layer by chemical vapor deposition. The material of the surface passivation layer includes one or more of silicon nitride, silicon oxide, silicon oxynitride, aluminum oxide, silicon carbide, and amorphous silicon. The surface passivation layer is used to realize the surface passivation and anti-reflection functions of the back contact battery. Since the relevant design of the surface passivation layer is not the focus of the present application, it will not be described one by one here.

[0087] like Figure 6 As shown, as an optional embodiment, between the first emitter region 131 and the second emitter region 132, the surface of the battery body 1 may also include a third region, namely, an isolation region (also referred to as a gap region), which prevents the first emitter region 131 and the second emitter region 132 from contacting and leaking electricity when the back contact battery is working normally.

[0088] Furthermore, if Figure 6 As shown, the first connection electrode 2-3 has the same polarity as the first collector electrode 2-1, and the emitter region corresponding to the first connection electrode 2-3 is also the first emitter region 131. The second connection electrode has the same polarity as the second collector electrode 2-2, and the emitter region corresponding to the second connection electrode is also the second emitter region 132. Similar to the above, the first connection electrode 2-3 can be set on one side of the battery body 1, so the emitter region with the same polarity also corresponds to one side; the first connection electrode 2-3 and the second connection electrode with opposite polarities can also be set as Figure 6 As shown, they appear on both sides of the battery body 1 at the same time, and the emitter regions 13 with opposite polarities are also arranged on both sides of the battery body 1 accordingly.

[0089] According to the embodiments of the present application, Figure 7 As shown, the length W5 of the disconnection portion 21 extending along the second direction is 20-6000 μm, for example, 20 μm, 100 μm, 1000 μm, 2000 μm, 3000 μm, 4000 μm, 5000 μm or 6000 μm. When W5 is set in the above range, it helps to ensure the electrical isolation effect between the disconnection portion 21 and the electrical connection lines of different polarities, and reduce the amount of insulating material used at the disconnection portion 21, thereby reducing costs.

[0090] Optionally, the length W5 of the disconnection portion 21 along the second direction is 1000-3000 μm. Setting W5 within the above range can ensure sufficient isolation between the electrode sub-portion 22 and the electrical connection lines of different polarities.

[0091] Further optionally, the length W5 of the disconnection portion 21 in the first region 1-1 along the second direction may be 1600 μm; the length W5 of the disconnection portion 21 in the second region 1-2 along the second direction may be 2000 μm. The length W5 of the disconnection portion 21 of the main body of the battery body 1 is adjusted to 1600 μm, which can ensure that the local current of the solar cell is fully collected and the electrode sub-portion 22 is fully insulated from the electrical connection wires of different polarities; setting the W5 of the second region at a greater distance helps to further block the possibility of the electrode sub-portion 22 contacting the electrical connection wires of different polarities, thereby ensuring the effectiveness of the battery.

[0092] According to an embodiment of the present application, the width of the electrode sub-portion 22 along the first direction is 10-500 μm, for example, 10 μm, 30 μm, 50 μm, 100 μm, 150 μm, 200 μm, 300 μm, 400 μm or 500 μm. The width of the electrode sub-portion 22 is set to the above range, while ensuring that the battery current is fully collected, reducing the loss of light shielding of the electrode sub-portion 22, and improving the conversion efficiency of the solar cell.

[0093] According to an embodiment of the present application, Figure 7 A schematic diagram showing the connection between the solar cell provided in the embodiment of the present application and the external electrical connection line is shown, Figure 7 As shown, the two ends of the electrode sub-sections 22 on both sides of the disconnection portion 21 along the second direction are respectively provided with first insulating portions 211. It should be noted that when the length of the disconnection portion 21 along the second direction is greater than a certain range, for example, more than 2000 μm, since the possibility of contact between the external electrical connection wire and the electrode sub-sections 22 of different polarities has been avoided, the first insulating portion 211 may not be provided, that is, the electrical isolation state between the external electrical connection wire and the electrode sub-sections 22 of different polarities can be achieved. The first insulating portion 211 may also be provided at both ends of the electrode sub-sections 22 on both sides of the disconnection portion 21, respectively, to increase the isolation effect between the external electrical connection wire and the electrode sub-sections 22 of different polarities, further reduce the risk of short circuit, and improve the reliability of the connection between solar cells. The present application can reduce the use of insulating materials by providing or not providing the first insulating portion 211, save costs, reduce the shading loss of the first insulating portion 211, and improve the photoelectric conversion efficiency of solar cells.

[0094] According to an embodiment of the present application, the second insulating portion 221 is located between two adjacent conductive bonding portions 23 on the same electrode sub-portion 22. The electrical connection line is electrically isolated from the electrode sub-portions 22 of different polarities by the second insulating portion 221. The shape of the first insulating portion 211 and / or the second insulating portion 221 can be, for example, block-shaped or strip-shaped, which is not particularly limited here. The first insulating portion 211 and / or the second insulating portion 221 can be made of inorganic materials, such as silicon oxide, silicon nitride, etc., or can be made of organic materials, such as insulating glue, etc. The thickness of the first insulating portion 211 and the second insulating portion 221 is the same. When the thickness of the two is different, a height difference occurs between the welding points accordingly. The electrical connection lines at adjacent positions are arched due to the stress after welding cooling, thereby affecting the electrical connection effect between the electrode sub-portion 22 and the electrical connection line, which may cause poor contact or short circuit risks, and affect the reliability of the connection between solar cells.

[0095] In some embodiments of the present application, Figure 7 As shown, the size of the second insulating portion 221 is larger than that of the first insulating portion 211. As mentioned above, due to the setting of the disconnecting portion 21, when connecting external electrical connection wires of different polarities to the electrode sub-portion 22, less insulating material is used, and a better electrical isolation effect can be achieved, which further reduces the use of insulating materials, saves costs, and reduces the light loss caused by the insulating portion covering.

[0096] It should be noted that the first insulating part 211 and / or the second insulating part 221 can be printed during the preparation process of the battery cell as needed, that is, the first insulating part 211 and / or the second insulating part 221 are present on the finished battery cell; of course, the first insulating part 211 and / or the second insulating part 221 can also be prepared without printing the first insulating part 211 and / or the second insulating part 221, and when the photovoltaic module is subsequently formed, the first insulating part 211 and / or the second insulating part 221 can be formed by printing as needed.

[0097] According to an embodiment of another aspect of the present application, a photovoltaic component is provided, comprising a plurality of solar cells as described above; and a plurality of electrical connection lines, comprising a first electrical connection line and a second electrical connection line extending along a first direction and alternately arranged in a second direction, the electrode sub-portion 22 of the first collecting electrode 2-1 being electrically connected to the first electrical connection line via a corresponding conductive bonding portion 23; the electrode sub-portion 22 of the second collecting electrode 2-2 being electrically connected to the second electrical connection line via a corresponding conductive bonding portion 23; each electrical connection line passes through the disconnection portion 21 of the collector electrode 2 of the opposite polarity along the second direction, and is electrically connected to the collector electrode 2 of the same polarity through the conductive bonding portion 23, or crosses the collector electrode 2 of the opposite polarity along the second direction, and is electrically insulated from the collector electrode 2 of the opposite polarity.

[0098] It should be noted that the electrical insulation between the electrical connection line and the opposite polarity collector electrode 2 can be achieved by the second insulating portion 221 as described above. The size and material of the second insulating portion 221 are consistent with the above content and will not be repeated here.

[0099] According to an embodiment of the present application, a disconnecting portion 21 is provided in the first collecting electrode 2-1 and the second collecting electrode 2-2 to separate a plurality of electrode sub-portions 22, so that during the assembly process of the photovoltaic module, when the electrical connecting line crosses the electrode sub-portions 22 of different polarities, the use of insulating materials can be reduced, thereby saving costs.

[0100] In some embodiments of the present application, the width of the electrical connection line along the second direction is 10-500 μm, for example, 10 μm, 30 μm, 50 μm, 100 μm, 150 μm, 200 μm, 300 μm, 400 μm or 500 μm. The width of the electrical connection line is set to the above range, while ensuring that the battery current is fully collected, reducing the loss of shading of the electrical connection line and improving the conversion efficiency of the solar cell.

[0101] Optionally, the electrical connection line may be, for example, a metal strip having various cross-sectional shapes, such as a circular, triangular, rectangular, flat, elliptical, or rectangular with chamfered corners, etc., which is not particularly limited here.

[0102] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A solar cell comprising: Battery body; A busbar-free region, the busbar-free region being located on a surface of the battery body; and a plurality of first collector electrodes and a plurality of second collector electrodes are located in the main grid-free region; the plurality of first collector electrodes and the plurality of second collector electrodes all extend along the second direction, the plurality of first collector electrodes and the plurality of second collector electrodes are alternately arranged along the first direction, the first direction and the second direction are perpendicular to each other; the first collector electrode and the second collector electrode have opposite polarities; Wherein, the first collector electrode and the second collector electrode each include a plurality of electrode sub-portions and a disconnection portion located between adjacent electrode sub-portions; the electrode sub-portions extend along the second direction; Each of the electrode sub-sections is provided with at least one conductive joint; There are at least two adjacent electrode sub-sections of the same polarity whose connecting line along the first direction passes through the electrode sub-sections of opposite polarity between the adjacent electrode sub-sections of the same polarity.

2. The solar cell according to claim 1, wherein: The disconnected portion of the first collector electrode and the conductive joint portion of the second collector electrode adjacent to the first direction are arranged correspondingly in position along the first direction; And / or, the disconnected portion of the second collecting electrode and the conductive connecting portion of the first collecting electrode adjacent to the first collecting electrode along the first direction are arranged correspondingly in position along the first direction.

3. The solar cell according to claim 1 or 2, wherein: The disconnected portion of the first collector electrode is staggered with the disconnected portion of the first collector electrode adjacent to the first direction; And / or, the disconnected portion of the second collector electrode is offset from the disconnected portion of the second collector electrode adjacent to the second collector electrode along the first direction.

4. The solar cell according to any one of claims 1 to 3, wherein The conductive connecting portion of each first collector electrode is provided with the electrode sub-portion adjacent to the second collector electrode on one side along the first direction, and is provided with the disconnecting portion adjacent to the second collector electrode on the other side.

5. The solar cell according to any one of claims 1 to 4, wherein Two of the conductive combining parts are arranged on each of the electrode sub-parts at intervals along the second direction; Along the first direction, in two adjacent electrode sub-sections with opposite polarities, a conductive connecting portion of one electrode sub-section is located between two conductive connecting portions of the other electrode sub-section.

6. The solar cell according to any one of claims 1 to 5, wherein The battery body has a first side and a second side opposite to each other along a second direction; The solar cell further comprises: A first connecting electrode extending along a first direction and close to a first side, wherein the first connecting electrode connects at least two of the electrode sub-portions of the first collecting electrode; and / or, The second connecting electrode extends along the first direction and is close to the second side, and the second connecting electrode connects at least two of the electrode sub-portions of the second collecting electrode.

7. The solar cell according to any one of claims 1 to 6, wherein The busbar-free region includes a first region and a second region, wherein the second region is located on a side of the first region close to an edge of the cell along the first direction; A size of the conductive joint in the first region along the second direction is smaller than a size of the conductive joint in the second region along the second direction.

8. The solar cell according to claim 7, wherein: The length of the disconnected portion located in the first region extending along the second direction is less than or equal to the length of the disconnected portion located in the second region extending along the second direction.

9. The solar cell according to any one of claims 1 to 8, wherein Along the first direction, geometric centers of the conductive junctions of the plurality of electrode sub-sections having the same polarity are located on a common straight line.

10. The solar cell according to any one of claims 1 to 9, wherein: Along the first direction, the plurality of conductive bonding portions corresponding to the plurality of first collecting electrodes are divided into first conductive bonding portions and second conductive bonding portions, and the sizes of the first conductive bonding portions and the second conductive bonding portions in the second direction are different; along the first direction, the first conductive bonding portions and the second conductive bonding portions are alternately arranged; and / or, Along the first direction, the multiple conductive bonding parts corresponding to the multiple second collecting electrodes are divided into third conductive bonding parts and fourth conductive bonding parts, and the sizes of the third conductive bonding parts and the fourth conductive bonding parts in the second direction are different; along the first direction, the third conductive bonding parts and the fourth conductive bonding parts are arranged alternately at intervals.

11. The solar cell according to any one of claims 1 to 10, wherein: The distance between adjacent conductive bonding parts on the same electrode sub-part is 5-40 mm.

12. The solar cell according to any one of claims 1 to 11, wherein: The width of the conductive bonding portion along the first direction is 30-6000 μm, preferably 50-1000 μm, more preferably 50-200 μm; the length along the second direction is 30-6000 μm, preferably 50-4000 μm, more preferably 200-1000 μm.

13. The solar cell according to any one of claims 1 to 12, wherein: The battery body further includes a first emitter region corresponding to the first collector electrode and a second emitter region corresponding to the second collector electrode; the first emitter region and the second emitter region are continuous at the disconnection portion.

14. The solar cell according to any one of claims 1 to 13, wherein: The length of the break portion extending along the second direction is 20-6000 μm, preferably 1000-3000 μm, and more preferably 1600 μm or 2000 μm.

15. The solar cell according to any one of claims 1 to 14, wherein The solar cell further comprises a main grid region located on a surface of the battery body; the main grid region is located on one side of the first region close to the edge of the battery cell along the first direction; The main gate segment is arranged in the main gate area, and the main gate segment is electrically connected to the electrode sub-portion of the same polarity and electrically isolated from the electrode sub-portion of the opposite polarity.

16. The solar cell according to any one of claims 1 to 15, wherein Two ends of the electrode sub-portion on both sides of the disconnection portion along the second direction are respectively provided with a first insulating portion.

17. The solar cell according to claim 16, wherein: The second insulating portion is located between two adjacent conductive connecting portions on the same electrode sub-portion.

18. The solar cell according to claim 17, wherein: The second insulating portion has a size greater than that of the first insulating portion.

19. A photovoltaic module comprising a plurality of solar cells according to any one of claims 1 to 18; and a plurality of electrical connection lines, the electrical connection lines comprising first electrical connection lines and second electrical connection lines extending along the first direction and arranged alternately and spaced apart in the second direction; the electrode sub-portions of the first collector electrode are electrically connected to the first electrical connection lines via corresponding conductive joints; The electrode sub-portion of the second current collecting electrode is electrically connected to the second electrical connection line via the corresponding conductive joint portion; Each of the electrical connection lines passes through the disconnected portion of the different polarity collector electrodes along the second direction, or crosses over the different polarity collector electrodes along the second direction, and is electrically insulated from the different polarity collector electrodes.

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