Photovoltaic cell, photovoltaic module

Abstract

The embodiment of the present disclosure relates to the photovoltaic field, and provides a photovoltaic cell and a photovoltaic module, the photovoltaic cell comprises: a cell substrate having two surface sides opposite along a first direction, at least one surface side comprising an interconnection area and a non-interconnection area opposite along a second direction, and a connecting area between the interconnection area and the non-interconnection area; a plurality of grid lines arranged at intervals along the second direction and located on the at least one surface side, the grid lines extending along a third direction; a straight-through part located on the non-interconnection area, the straight-through part extending along the second direction; a connecting block located on a side of the straight-through part away from the cell substrate; and an oblique-through part located on the interconnection area, the oblique-through part comprising two bus lines intersecting in the extending direction; the interconnection area is an area on the surface side provided with components for electrically connecting two adjacent photovoltaic cells, the non-interconnection area is an area on the surface side not provided with components for electrically connecting two adjacent photovoltaic cells, and at least the photovoltaic cell is beneficial to reducing the light-shielding area of the photovoltaic cell and improving the structural stability of the photovoltaic cell.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of photovoltaics, and in particular to a photovoltaic cell and a photovoltaic module. BACKGROUND

[0002] With the gradual depletion of fossil energy, photovoltaic cells are used more and more widely as a new energy alternative. Photovoltaic cells are devices that convert solar light energy into electrical energy. Photovoltaic cells use the photovoltaic principle to generate carriers, and then use electrodes to lead out the carriers, thereby facilitating the effective use of electrical energy. Current photovoltaic cells mainly include BC (Back Contact) cells, TOPcon (Tunnel Oxide Passivated Contact) cells, PERC (Passivated emitter and real cell) cells, and heterojunction cells, etc.

[0003] However, the area where the electrodes are arranged in the photovoltaic cell can be regarded as a light-shielding area, and the part of the photovoltaic cell where the substrate is located in this area receives less total light, which is not conducive to improving the photoelectric conversion efficiency of the solar cell. SUMMARY

[0004] The embodiments of the present disclosure provide a photovoltaic cell and a photovoltaic module, which at least help to reduce the light-shielding area of the photovoltaic cell and improve the structural stability of the photovoltaic cell.

[0005] According to some embodiments of the present disclosure, the embodiments of the present disclosure provide a photovoltaic cell, comprising: a cell substrate having two surface sides opposite along a first direction, at least one of the surface sides comprising an interconnection area and a non-interconnection area opposite along a second direction, and a connection area between the interconnection area and the non-interconnection area, the first direction being the thickness direction of the cell substrate, and the second direction intersecting the first direction; a plurality of grid lines arranged at intervals along the second direction on at least one of the surface sides, the grid lines extending along a third direction; a straight-through portion on the non-interconnection area, the straight-through portion extending along the second direction; a connecting block on a side of the straight-through portion away from the cell substrate; an inclined-through portion on the interconnection area, the inclined-through portion comprising two bus bars intersecting in extension, the second direction, the third direction, and the extension direction of the bus bars lying on the same plane and intersecting each other in pairs; wherein the interconnection area is an area on the surface side where components for electrically connecting two adjacent photovoltaic cells are arranged, and the non-interconnection area is an area on the surface side where components for electrically connecting two adjacent photovoltaic cells are not arranged.

[0006] In some embodiments, the number of the connection blocks in contact with a single straight-through portion is multiple; wherein two adjacent connection blocks on the same straight-through portion are arranged at intervals, or two adjacent connection blocks on the same straight-through portion are in contact.

[0007] In some embodiments, the shape of the projection of the connection block on the surface side is a quadrilateral, and one diagonal of the quadrilateral is located in the projection of the straight-through portion on the surface side.

[0008] In some embodiments, the photovoltaic cell further comprises: a first pad in contact with the straight-through portion, located on an area in the connection region close to the non-interconnected region; a second pad in contact with the oblique-through portion, located on an area in the connection region close to the interconnected region; wherein the first pad is in contact with at least one grid line, and the second pad is in contact with at least one grid line.

[0009] In some embodiments, the photovoltaic cell further comprises: a plurality of welding blocks arranged at intervals along the second direction, the welding blocks being located between the first pad and the second pad adjacent along the second direction, and the projection area of the welding block on the surface side is smaller than the projection area of the pad on the surface side, the pad being the first pad or the second pad.

[0010] In some embodiments, the projection area of the connection block on the surface side is smaller than or equal to the projection area of the welding block on the surface side.

[0011] In some embodiments, the ratio of the projection area of the welding block on the surface side to the projection area of the pad on the surface side is 0.25-0.625.

[0012] In some embodiments, the photovoltaic cell further comprises: a plurality of welding points arranged at intervals along the second direction, the welding points being located between the first pad and the second pad adjacent along the second direction, and a single welding point being in contact with a single grid line; wherein the welding point comprises a welding line extending along the third direction and an extension line extending along the second direction, and the two opposite segments of the welding line along the third direction are respectively in contact with a welding line.

[0013] In some embodiments, the photovoltaic cell further comprises: a connection line extending along the second direction, located between two welding points adjacent along the second direction, and in contact with two welding lines adjacent along the second direction.

[0014] In some embodiments, the battery substrate includes a first edge side and a second edge side opposite to each other along the second direction, and the two surface sides opposite to each other along the first direction are a first surface side and a second surface side respectively; the grid lines include a first grid line located on the first surface side and a second grid line located on the second surface side; in the same photovoltaic cell, the interconnection region includes a first interconnection region of the first surface side and a second interconnection region of the second surface side, and the non-interconnection region includes a first non-interconnection region of the first surface side and a second non-interconnection region of the second surface side, the first interconnection region and the second non-interconnection region are close to the first edge side, and the first non-interconnection region and the second interconnection region are close to the second edge side.

[0015] In some embodiments, the grid lines are located on one surface side, the grid lines include first grid lines and second grid lines arranged alternately along the second direction; the surface side provided with the grid lines includes first soldering regions and second soldering regions arranged alternately along the second direction, the first soldering regions are used for positioning components for collecting currents on the plurality of first grid lines, and the second soldering regions are used for positioning components for collecting currents on the plurality of second grid lines; wherein each soldering region includes the interconnection region and the non-interconnection region opposite to each other along the second direction, the interconnection region and the non-interconnection region are arranged alternately along the second direction, and the soldering region is the first soldering region or the second soldering region.

[0016] According to some embodiments of the present disclosure, another aspect of the embodiments of the present disclosure further provides a photovoltaic module, including: a cell string connected by a plurality of photovoltaic cells according to any one of the above embodiments; an encapsulating film used for covering a surface of the cell string; and a cover plate used for covering a surface of the encapsulating film away from the cell string.

[0017] The technical solutions provided by the embodiments of the present disclosure have at least the following advantages:

[0018] Compared with two bus bars with different extension directions in the oblique through part, the straight through part is a strip structure extending along the second direction. In this way, when the layout length along the second direction is consistent, the extension length of the straight through part is less than that of the bus bar, on the one hand, which is conducive to reducing the layout area of the straight through part on the battery substrate, thereby reducing the preparation cost of the straight through part, on the other hand, which is conducive to reducing the area of the light shielding region caused by the straight through part, so that more areas in the battery substrate are not shielded to improve the total amount of light received. Moreover, the subsequent component for electrically connecting two adjacent photovoltaic cells is generally a solder strip, even if the solder strip extends to a part of the area of the non-interconnected region, the orthogonal projection of the solder strip on the battery substrate is mostly coincided with the orthogonal projection of the straight through part on the battery substrate, and does not cause excessive additional light shielding area on the battery substrate. In addition, unlike the straight through part arranged in the non-interconnected region, the oblique through part is designed in the interconnected region, so that the overlapping area of the orthogonal projection of the oblique through part on the battery substrate and the orthogonal projection of the solder strip on the battery substrate is almost 0, which is conducive to reducing the risk of the subsequent solder strip causing a large force on the oblique through part, so as to reduce the risk of the oblique through part breaking. Therefore, it is conducive to reducing the risk of the oblique through part breaking by means of the oblique through part to avoid the carriers in the interconnected region from being effectively collected, so that the solder strip can collect as many carriers in each grid line as possible, thereby not only improving the photoelectric conversion efficiency of the photovoltaic cell based on the reduction of the light shielding area, but also improving the structural stability of the photovoltaic cell based on the reduction of the risk of breaking.

[0019] Further, the connecting block is designed on the side of the straight through part away from the battery substrate, even if the subsequent solder strip extends to a part of the area of the non-interconnected region to cause a large force on the non-interconnected region, the connecting and fixing effect of the connecting block on the straight through part can reduce the risk of the straight through part breaking, and ensure the effective collection of carriers in the non-interconnected region, thereby further improving the structural stability of the photovoltaic cell; moreover, the carriers collected by the straight through part can be directly transmitted to the solder strip along the first direction by means of the connecting block. BRIEF DESCRIPTION OF DRAWINGS

[0020] One or more embodiments are illustrated by way of example in the drawings that are for illustrative purposes only, and not for the purposes of limiting the embodiments, unless otherwise explicitly stated in the specification. As is evident from the figures and their descriptions, one or more of the figures can not be to scale as the drawings are for clarity of description only. In the following description, for the purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. It will be apparent, however, to one skilled in the art that the embodiments can be practiced without all these specific details. In other instances, well-known structures and devices are not shown in order to avoid obscuring the description.

[0021] Figure 1 A first partial cross-sectional schematic view of a photovoltaic cell according to an embodiment of the present disclosure is provided.

[0022] Figure 2 A second partial cross-sectional view of a photovoltaic cell according to an embodiment of the present disclosure is provided;

[0023] Figure 3 A first partial cross-sectional view of two adjacent photovoltaic cells after electrical connection according to an embodiment of the present disclosure is provided;

[0024] Figure 4 A second partial cross-sectional view of two adjacent photovoltaic cells after electrical connection according to an embodiment of the present disclosure is provided;

[0025] Figure 5 A third partial cross-sectional view of a photovoltaic cell according to an embodiment of the present disclosure is provided;

[0026] Figure 6 A fourth partial cross-sectional view of a photovoltaic cell according to an embodiment of the present disclosure is provided;

[0027] Figure 7 A fifth partial cross-sectional view of a photovoltaic cell according to an embodiment of the present disclosure is provided;

[0028] Figure 8 A first partial cross-sectional view of three adjacent photovoltaic cells after electrical connection according to an embodiment of the present disclosure is provided;

[0029] Figure 9 A second partial cross-sectional view of three adjacent photovoltaic cells after electrical connection according to an embodiment of the present disclosure is provided;

[0030] Figure 10 A partial cross-sectional view of a photovoltaic module according to another embodiment of the present disclosure is provided; Figure 8 A partial cross-sectional view of a photovoltaic module according to another embodiment of the present disclosure is provided.

[0031] Figure 11 A partial cross-sectional view of a photovoltaic module according to another embodiment of the present disclosure is provided. Figure 9 A partial cross-sectional view of a photovoltaic module according to another embodiment of the present disclosure is provided.

[0032] Legend of reference signs:

[0033] 100, battery substrate; 10, surface side; 110, first surface side; 120, second surface side; 11, interconnection area; 1101, first interconnection area; 1201, second interconnection area; 12, non-interconnection area; 1102, first non-interconnection area; 1202, second non-interconnection area; 13, connection area; 1103, first welding area; 1104, second welding area; 20, first edge side; 30, second edge side; 101, gate line; 111, first gate line; 121, second gate line; 102, straight-through part; 103, connection block; 104, oblique-through part; 114, bus line; 105, solder pad; 115, first solder pad; 125, second solder pad; 106, welding block; 107, welding point; 117, welding line; 127, extension line; 108, connection line; 40, photovoltaic cell; 41, encapsulation adhesive film; 42, cover plate; 43, solder ribbon. DETAILED DESCRIPTION

[0034] As can be known from the background, the photoelectric conversion efficiency of the photovoltaic cell needs to be improved.

[0035] The photovoltaic cell and the photovoltaic module provided by the embodiments of the present disclosure have the following beneficial effects. Compared with two bus lines with different extension directions in the oblique-through part, the straight-through part is a strip-shaped structure extending along the second direction, which is conducive to reducing the layout area of the straight-through part on the battery substrate, thereby reducing the preparation cost of the straight-through part, and reducing the area of the light-shielding region caused by the straight-through part, so that more areas in the battery substrate are not shielded to improve the total amount of light received. Moreover, even if the solder ribbon extends to the partial area of the non-interconnection area, it will not cause excessive additional light-shielding area on the battery substrate. In addition, unlike the straight-through part arranged in the non-interconnection area, the oblique-through part is designed on the interconnection area, so that the overlapping area of the orthographic projection of the oblique-through part on the battery substrate and the orthographic projection of the solder ribbon on the battery substrate is almost 0, which is conducive to reducing the risk of the oblique-through part being subjected to a large force by the solder ribbon, so as to reduce the risk of the oblique-through part being broken. Therefore, it is conducive to reducing the risk of the oblique-through part being broken by means of the oblique-through part to avoid the carriers in the interconnection area from being effectively collected, so that the solder ribbon can collect as many carriers as possible in each gate line, thereby not only improving the photoelectric conversion efficiency of the photovoltaic cell based on the reduction of the light-shielding area, but also improving the structural stability of the photovoltaic cell based on the reduction of the risk of being broken. Further, the connection block is designed on the side of the straight-through part away from the battery substrate, so that even if the solder ribbon extends to the partial area of the non-interconnection area and causes a large force on the non-interconnection area, the connection and fixing effect of the connection block on the straight-through part can reduce the risk of the straight-through part being broken, so as to ensure the effective collection of the carriers in the non-interconnection area, thereby further improving the structural stability of the photovoltaic cell; and the carriers collected by the straight-through part can be directly transmitted to the solder ribbon in the first direction by means of the connection block.

[0036] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise explicitly specified and limited.

[0037] Reference herein to "embodiments" means that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily a separate or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0038] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can mean: A exists, A and B exist, and B exists. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0039] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two), and similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0040] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0041] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0042] In the drawings corresponding to the embodiments of the present application, the thickness and area of a layer are exaggerated for clarity and ease of description. When it is described that one component (such as a layer, a film, a region, or a substrate) is on or is on the surface of another component, the one component can be "directly" on the surface of the other component, or a third component can be present between the two components. Conversely, when it is described that one component is on the surface of another component or that one component forms or is provided with another component, it is indicated that there is no third component between the two components. In addition, when it is described that one component is "approximately" formed on another component, it means that the one component is not formed on the entire surface (or front surface) of the other component, nor is it formed on a partial edge of the entire surface.

[0043] In the description of the embodiments of the present application, when a certain component "includes" another component, unless otherwise specified, other components can also be included, and other components can also be further included. In addition, when a layer, a film, a region, or a plate, and the like, are referred to as "on / over" another component, it can be "directly on" another component (i.e., between the surface of another component and another component, there is no other component), or another component can be present therebetween. In addition, when a layer, a film, a region, a plate, and the like, are "directly on" another component, or when a layer, a film, a region, a plate, and the like, are on the surface of another component, it is indicated that there is no other component therebetween.

[0044] The terms used in the description of various described embodiments herein are only used to describe specific embodiments, and are not intended to be limiting. As used in the description of various described embodiments and in the appended claims, "the component" is also intended to include the plural form, unless the context clearly indicates otherwise. Among them, the components include layers, films, regions, or plates, and the like.

[0045] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in the embodiments of the present disclosure, many technical details are presented in order to enable the reader to better understand the embodiments of the present disclosure. However, the technical solutions claimed by the embodiments of the present disclosure can be implemented even without these technical details and based on various changes and modifications of the following embodiments.

[0046] An embodiment of the present disclosure provides a photovoltaic cell, and the photovoltaic cell provided by the embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0047] Combined reference Figures 1 to 4The photovoltaic cell comprises: a cell substrate 100 having two surface sides 10 opposite along a first direction X, at least one surface side 10 comprising an interconnection area 11 and a non-interconnection area 12 opposite along a second direction Y, and a connecting area 13 between the interconnection area 11 and the non-interconnection area 12, the first direction X being a thickness direction of the cell substrate 100, and the second direction Y intersecting the first direction X; a plurality of grid lines 101 arranged at intervals along the second direction Y and located on the at least one surface side 10, the grid lines 101 extending along a third direction Z; a straight-through part 102 located on the non-interconnection area 12, the straight-through part 102 extending along the second direction Y; a connecting block 103 located on a side of the straight-through part 102 away from the cell substrate 100; and an oblique-through part 104 located on the interconnection area 11, the oblique-through part 104 comprising two bus lines 114 intersecting in extension, the second direction Y, the third direction Z and the extension direction of the bus lines 114 being located in the same plane and intersecting two by two; wherein the interconnection area 11 is an area on the surface side 10 provided with components for electrically connecting adjacent two photovoltaic cells, and the non-interconnection area 12 is an area on the surface side 10 not provided with components for electrically connecting adjacent two photovoltaic cells.

[0048] wherein, Figure 1 a first partial cross-sectional schematic view of a photovoltaic cell according to an embodiment of the present disclosure; Figure 2 a second partial cross-sectional schematic view of a photovoltaic cell according to an embodiment of the present disclosure; Figure 3 a first partial cross-sectional schematic view of adjacent two photovoltaic cells after electrical connection according to an embodiment of the present disclosure; Figure 4 a second partial cross-sectional schematic view of adjacent two photovoltaic cells after electrical connection according to an embodiment of the present disclosure.

[0049] It should be noted that, Figures 1 to 4 in each of the figures, the photovoltaic cell is truncated along the second direction Y by a truncated wavy line to show the non-interconnection area 12, the connecting area 13 and the interconnection area 11 of the photovoltaic cell along the second direction Y; Figures 1 to 4 in each of the figures, the photovoltaic cell is truncated along the third direction Z by another truncated wavy line to show the two sides of the photovoltaic cell along the third direction Z; and Figures 1 to 4 in each of the figures, the truncated wavy line is drawn by a dashed line. In addition, based on the difference in type of the photovoltaic cell, the arrangement of the components such as the interconnection area 11, the non-interconnection area 12 and the grid line 101 on the surface side 10 will be different, which will be described in detail in combination with Figure 3 and Figure 4 different types of photovoltaic cells.

[0050] It is worth noting that, compared with the two busbars 114 extending in different directions in the inclined portion 104, the straight portion 102 is a strip structure extending in the second direction Y. In this way, under the condition that the layout length in the second direction Y is consistent, the extension length of the straight portion 102 is smaller than that of the busbar 114. On the one hand, compared with the inclined portion 104, it is beneficial to reduce the layout area of the straight portion 102 on the battery substrate 100, so as to reduce the material consumption of the straight portion 102 and thus reduce the preparation cost of the straight portion 102. On the other hand, compared with the inclined portion 104, it is beneficial to reduce the area of the light shielding area caused by the straight portion 102, so that more areas in the battery substrate 100 are not shielded, so as to improve the total amount of light received.

[0051] Moreover, the component for electrically connecting the adjacent two photovoltaic cells in sequence is generally a solder strip 43 (for reference Figure 3 or Figure 4 When the component for electrically connecting the adjacent two photovoltaic cells in sequence, i.e. the solder strip 43, is arranged, the solder strip 43 needs to be located on the interconnection area 11 and the connection area 13. The opposite two ends of the solder strip 43 in the second direction Y can not extend to the non-interconnection area 12. Even if the solder strip 43 extends to part of the non-interconnection area 12, the orthographic projection of the solder strip 43 on the battery substrate 100 is mostly coincided with the orthographic projection of the straight portion 102 on the battery substrate 100, and will not cause too much additional light shielding area on the battery substrate 100. It is worth emphasizing that, in order to clearly show the layout position of the solder strip 43 on the photovoltaic cell, Figure 3 and Figure 4 the solder strip 43 is drawn in a perspective drawing mode in the above two figures.

[0052] In addition, since the interconnection region 11 is a region on the surface side 10 provided with components electrically connecting two adjacent photovoltaic cells, the solder strip 43 will extend along the second direction Y to be located on two interconnection regions 11 of two adjacent photovoltaic cells, and the interconnection region 11 is closer to the edge of the cell substrate 100 than the connection region 13, so that when the solder strip 43 is subsequently welded to the interconnection region 11, the interconnection region 11 will be subjected to a greater force caused by welding, and the problem of cracking or broken grid is more likely to occur. Based on this, unlike the straight-through portion 102 provided on the non-interconnection region 12, the inclined-through portion 104 is designed on the interconnection region 11, and the second direction Y and the extension direction of the busbar 114 are located in the same plane and intersect, so that the two busbars 114 intersecting in the inclined-through portion 104 are different from the extension direction of the solder strip 43, for example, the solder strip 43 is arranged between the two busbars 114 of the same inclined-through portion 104. In other words, the overlapping area of the orthographic projection of the inclined-through portion 104 on the cell substrate 100 and the orthographic projection of the solder strip 43 on the cell substrate 100 is almost 0, and the inclined-through portion 104 will not be located directly below the solder strip 43, which is beneficial to reduce the risk of the inclined-through portion 104 being subjected to a greater force caused by welding when the solder strip 43 is subsequently welded to the interconnection region 11, so as to reduce the risk of the inclined-through portion 104 being broken.

[0053] It should be noted that no matter the interconnection region 11, the non-interconnection region 12 or the connection region 13 is provided with a plurality of grid lines 101 arranged at intervals, in general, the number of grid lines 101 located on the interconnection region 11 will be less than the number of grid lines 101 located on the connection region 13, the number of grid lines 101 located on the non-interconnection region 12 will be less than the number of grid lines 101 located on the connection region 13, the straight-through portion 102 is electrically connected with the grid line 101 located on the non-interconnection region 12 to collect the carriers in the non-interconnection region 12, and the inclined-through portion 104 is electrically connected with the grid line 101 located on the interconnection region 11 to collect the carriers in the interconnection region 11. Subsequently, when the solder strip 43 is used to electrically connect two adjacent photovoltaic cells, the solder strip 43 will generate a greater force on the interconnection region 11 than on the non-interconnection region 12. Based on this, the straight-through portion 102 is designed on the non-interconnection region 12, and the inclined-through portion 104 is designed on the interconnection region 11, which is beneficial to reduce the risk of the inclined-through portion 104 being broken while reducing the shading area of the photovoltaic cell by means of the straight-through portion 102, so as to avoid the carriers in the interconnection region 11 from being effectively collected, so that the solder strip 43 can collect the carriers in each grid line 101 as much as possible, thereby not only improving the photoelectric conversion efficiency of the photovoltaic cell based on the reduction of the shading area, but also improving the structural stability of the photovoltaic cell based on the reduction of the risk of being broken.

[0054] Further, the connecting block 103 is designed on the side of the through portion 102 away from the battery substrate 100. Even if the subsequent solder strip 43 extends to the partial area of the non-interconnected area 12 and brings a larger force to the non-interconnected area 12, the connecting and fixing effect of the connecting block 103 on the through portion 102 can reduce the risk of fracture of the through portion 102, ensure the effective collection of carriers of the non-interconnected area, and further improve the structural stability of the photovoltaic cell. Moreover, the carriers collected by the through portion 102 can be directly transmitted to the solder strip 43 along the first direction X vertically by means of the connecting block 103.

[0055] The photovoltaic cell provided by the embodiment of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0056] In some embodiments, with reference to Figures 1 to 4 , the case that the first direction X and the second direction Y intersect includes that the first direction X and the second direction Y are orthogonal, or the included angle formed by the case that the first direction X and the second direction Y intersect is an obtuse angle, or the included angle formed by the case that the first direction X and the second direction Y intersect is an acute angle.

[0057] In some cases, the included angle between the first direction X and the second direction Y can be 45°-90°, for example, can be 50°, 55°, 60°, 65°, 70°, 75°, 80° or 85°, etc.

[0058] In some cases, the case that the second direction Y, the third direction Z and the extension direction of the busbar 114 are located on the same plane and intersect with each other includes that the second direction Y, the third direction Z and the extension direction of the busbar 114 are all perpendicular to the first direction X.

[0059] In one example, the second direction Y can be perpendicular to the third direction Z, and the included angle formed by the extension direction of the busbar 114 and the second direction Y can be 30°-60°, for example, can be 35°, 40°, 45°, 50° or 55°, etc.

[0060] In some embodiments, with reference to Figures 1 to 4 , along the third direction Z, the width of the through portion 102 can be greater than the width of the busbar 114. Based on the foregoing analysis, when the subsequent solder strip 43 and the photovoltaic cell are welded, even if the solder strip 43 extends to the partial area of the non-interconnected area 12 and brings a larger force to the non-interconnected area 12, the wider through portion 102 is also beneficial to reduce the risk of its own stress fracture, and can further reduce its own transmission resistance.

[0061] In some embodiments, with reference to Figure 1 or Figure 2At least one of the plurality of gate lines 101 connected to the bus line 114 is disconnected at the bus line 114, in other words, along the third direction Z, at least one of the plurality of gate lines 101 connected to the bus line 114 is not arranged in the interval between two bus lines 114 in the same diagonal passing portion 104.

[0062] In some cases, referring to Figure 1 Among the plurality of gate lines 101 connected to the bus line 114, the gate line 101 closer to the connection region 13 is disconnected at the bus line 114, in other words, along the third direction Z, the gate line 101 is not arranged in the interval between two bus lines 114 in the same diagonal passing portion 104 in the region close to the connection region 13.

[0063] In other cases, referring to Figure 2 Among the plurality of gate lines 101 connected to the bus line 114, the gate line 101 closer to the edge of the photovoltaic cell is disconnected at the bus line 114, in other words, along the third direction Z, the gate line 101 is not arranged in the interval between two bus lines 114 in the same diagonal passing portion 104 in the region close to the edge of the photovoltaic cell. In other embodiments, referring to Figure 3 Or Figure 4 All of the plurality of gate lines 101 connected to the bus line 114 can be arranged in the interval between two bus lines 114 in the same diagonal passing portion 104.

[0064] The number and arrangement of the connection blocks 103 are described in detail below.

[0065] In some embodiments, referring to Figures 1 to 5 The number of the M connection blocks 103 connected to the single passing portion 102 can be multiple.

[0066] In some cases, referring to Figures 1 to 4 The two adjacent connection blocks 103 on the same passing portion 102 are arranged at intervals; in other cases, referring to Figure 5 , Figure 5 A third partial cross-sectional view of a photovoltaic cell according to an embodiment of the present disclosure is provided, in which the two adjacent connection blocks 103 on the same passing portion 102 are connected at intervals.

[0067] It should be noted that Figures 1 to 4 In the embodiment, only the number of the connection blocks 103 connected to the single passing portion 102 is taken as an example of 2, and the two connection blocks 103 are arranged at intervals, Figure 5 In the embodiment, only the number of the connection blocks 103 connected to the single passing portion 102 is taken as an example of 3, and the three connection blocks 103 are connected in sequence, in actual applications, the number of the connection blocks connected to the single passing portion can be flexibly designed based on the width of the non-interconnected region in the second direction.

[0068] In some examples, the single connecting block 103 can contact and connect 1-3 grid lines 101, Figures 1 to 5 In some examples, the single connecting block 103 can contact and connect 1-3 grid lines 101,

[0069] In some examples, the single connecting block 103 can contact and connect 1-3 grid lines 101, Figures 1 to 4 The area of the orthographic projection of the plurality of connecting blocks 103 on the battery substrate 100 contacted and connected by the single through portion 102 can be the same.

[0070] In some examples, the single connecting block 103 can contact and connect 1-3 grid lines 101, Figure 5 Since the number of grid lines 101 required to be converged by the through portion 102 gradually decreases in the direction away from the connecting area 13, and the effect of the solder strip 43 on the through portion gradually decreases when the solder strip 43 is welded to the photovoltaic cell, the area of the orthographic projection of the plurality of connecting blocks 103 on the battery substrate 100 contacted and connected by the single through portion 102 can gradually decrease in the direction away from the connecting area, which is conducive to reducing the shading area caused by the connecting block as much as possible and reducing the material required for preparing the connecting block to reduce the preparation cost of the connecting block.

[0071] The orthographic projection shape of the connecting block 103 is described in detail below.

[0072] In some examples, the single connecting block 103 can contact and connect 1-3 grid lines 101, Figures 1 to 5 The orthographic projection shape of the connecting block 103 on the surface side 10 can be a quadrilateral, and one diagonal of the quadrilateral is located in the orthographic projection of the through portion 102 on the surface side 10. In this way, it is conducive to increasing the contact area between the connecting block 103 and the through portion 102 as much as possible, i.e., increasing the overlapping area of the orthographic projections of the connecting block 103 and the through portion 102 on the battery substrate 100 as much as possible, to reduce the additional shading area of the battery substrate 100 caused by the connecting block 103 as much as possible, while improving the connection and fixing effect of the connecting block 103 on the through portion 102.

[0073] It should be noted that, Figures 1 to 5 In some examples, the single connecting block 103 can contact and connect 1-3 grid lines 101,

[0074] In some examples, the single connecting block 103 can contact and connect 1-3 grid lines 101, Figure 6 Figure 6 ​The fourth partial cross-sectional view of the photovoltaic cell provided by an embodiment of the present disclosure can further comprise: a first solder pad 115 in contact with the straight-through portion 102, located on the area of the connection region 13 close to the non-interconnected region 12; and a second solder pad 125 in contact with the oblique-through portion 104, located on the area of the connection region 13 close to the interconnected region 11; wherein the first solder pad 115 is in contact with at least one of the grid lines 101, and the second solder pad 125 is in contact with at least one of the grid lines 101.

[0075] It is worth noting that, for the convenience of subsequent electrical connection between two adjacent photovoltaic cells by means of the solder strip 43 (refer to Figure 3 or Figure 4 ), for any solder strip 43, one end of the solder strip 43 can be used as the starting soldering end, and the other end can be used as the tail soldering end. The area of the photovoltaic cell corresponding to the starting soldering end of the solder strip 43 can be regarded as the starting soldering position, i.e., the starting soldering position; and the area of the photovoltaic cell corresponding to the tail soldering end of the solder strip 43 can be regarded as the tail soldering position, i.e., the ending soldering position. Generally, compared with other areas of the solder strip 43 corresponding to the photovoltaic cell, the solder strip 43 has a greater force on the starting soldering position and the tail soldering position in the photovoltaic cell. Based on this, the first solder pad 115 in contact with the straight-through portion 102 can be regarded as the starting soldering position or the tail soldering position, so that the connection area of the end of the solder strip 43 and the photovoltaic cell can be improved by means of the first solder pad 115, and the problem of false soldering or soldering separation caused by excessive force of the solder strip 43 on the first solder pad 115 as the starting soldering position or the tail soldering position can be avoided, so as to improve the connection stability between the solder strip 43 and the photovoltaic cell; and moreover, it is beneficial to improve the alignment accuracy between the solder strip 43 and the first solder pad 115 and reduce the transmission resistance of the first solder pad 115 by means of the large size of the first solder pad 115. Further, even if the solder strip 43 extends to part of the non-interconnected region 12, the carriers collected by the straight-through portion 102 can be directly transmitted vertically to the solder strip 43 along the first direction X by means of the connection block 103, or can be first transmitted horizontally to the first solder pad 115 and then transmitted vertically to the solder strip 43 along the first direction X, so as to increase the transmission path of the carriers in the cell substrate 100 to the solder strip 43; if the solder strip 43 does not extend to the non-interconnected region 12, the carriers collected by the straight-through portion 102 can also be first transmitted horizontally to the first solder pad 115 and then transmitted vertically to the solder strip 43 along the first direction X, so as to ensure the collection of the carriers in the non-interconnected region 12 by the solder strip 43.

[0076] In addition, at the abutment of the two adjacent photovoltaic cells, the solder strip 43 is electrically connected with the two interconnection regions 11 of the two adjacent photovoltaic cells at the same time, and based on the change of the arrangement of the two adjacent photovoltaic cells, for example, the front and back surfaces are the same or different, the solder strip 43 can be deformed, for example, bent, at the interval of the two adjacent photovoltaic cells. Based on this, the solder strip 43 can cause a greater force on the two interconnection regions 11 of the two adjacent photovoltaic cells, and the second pad 125 is arranged on the area of the connection region 13 close to the interconnection region 11, and the second pad 125 is in contact with the inclined through portion 104. The connection area between the solder strip 43 and the interconnection region 11 can be improved by the second pad 125, so as to avoid the problem of virtual welding or delamination caused by the excessive force of the solder strip 43 on the interconnection region 11, so as to improve the connection stability between the solder strip 43 and the photovoltaic cell. Moreover, the alignment accuracy between the solder strip 43 and the second pad 125 and the transmission resistance of the second pad 125 itself can be improved by the large size of the second pad 125.

[0077] In some cases, referring to Figure 6 , the first pad 115 and the straight-through portion 102 can be one-to-one corresponding, and the second pad 125 and the inclined through portion 104 can be one-to-one corresponding.

[0078] In some cases, referring to Figure 6 , the first pad 115 can be in contact with 2-3 grid lines 101, and the second pad 125 can also be in contact with 2-3 grid lines 101. It should be noted that Figure 6 only takes the first pad 115 in contact with 2 grid lines 101 and the second pad 125 in contact with 2 grid lines 101 as an example.

[0079] In some cases, referring to Figure 7 , Figure 7 is a fifth partial cross-sectional view of a photovoltaic cell provided by an embodiment of the present disclosure. The photovoltaic cell can further include a plurality of solder blocks 106 arranged at intervals along the second direction Y, the solder block 106 being located between the first pad 115 and the second pad 125 adjacent along the second direction Y, and the projection area of the solder block 106 on the surface side 10 being smaller than the projection area of the pad 105 on the surface side 10, and also smaller than the projection area of the second pad 125 on the surface side 10, the pad 105 being the first pad 115 or the second pad 125.

[0080] It should be noted that the solder strip 43 (refer to Figure 3 or Figure 4Generally, the solder strip 43 is in a long strip structure, and based on this, the solder strip 43 will be deformed due to its own gravity and internal stress and the like within a certain extension length, thereby affecting the alignment accuracy of the solder strip 43 and the photovoltaic cell, and causing greater force on the photovoltaic cell at the deformation position. Therefore, two solder blocks 106 are arranged in a unit length of the solder strip 43 prone to self-deformation, and the solder strip 43 is fixed by the solder blocks 106 to avoid the reduction of the alignment accuracy caused by the self-deformation of the solder strip 43, for example, to avoid the offset of the solder strip 43, thereby ensuring the high connection accuracy between the solder strip 43 and the photovoltaic cell, and resisting the greater force caused by the self-deformation of the solder strip 43 by means of the solder blocks 106, so as to further improve the connection stability between the solder strip 43 and the photovoltaic cell.

[0081] In addition, compared with the starting welding position, the tail welding position or the interconnection area 11 adjacent to the two photovoltaic cells, the solder block 106 on the connection area 13 is subjected to smaller external force, and the probability of virtual welding or separation between the solder strip 43 and the solder block 106 is smaller. Therefore, the projection area of the solder block 106 on the surface side 10 is designed to be smaller than the projection area of the solder pad 105 on the surface side 10, which is conducive to stabilizing the connection between the solder strip 43 and the solder block 106 while reducing the projection area of the solder block 106 on the surface side 10 as much as possible, so as to reduce the shading area caused by the solder block 106 and reduce the preparation cost of the solder block 106.

[0082] In some examples, referring to Figure 7 , 3-8 solder blocks 106 can be arranged between the first solder pad 115 and the second solder pad 125 adjacent in the second direction Y. Figure 7 It is to be noted that

[0083] In some examples, referring to Figure 7 , the projection areas of the first solder pad 115 and the second solder pad 125 on the cell substrate 100 can be equal and greater than the projection area of the solder block 106 on the cell substrate 100.

[0084] In some examples, referring to Figure 7 , the projection area of the connection block 103 on the surface side 10 can be smaller than or equal to the projection area of the solder block 106 on the surface side 10. In this way, while ensuring that the through portion 102 is prevented from being broken by means of the connection block 103, the additional increase of the shading area caused by the connection block 103 is reduced, and the preparation cost of the connection block 103 is reduced.

[0085] In some examples, referring to Figure 7The ratio of the area of the footprint of the solder bump 106 on the surface side 10 to the area of the footprint of the pad 105 on the surface side 10 can be 0.25 to 0.625, for example, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, or 0.6, etc.

[0086] In some examples, the area of the footprint of the solder bump 106 on the surface side 10 can be 0.5 mm 2 ~1.2 mm 2 , for example, 0.55 mm 2 , 0.6 mm 2 , 0.65 mm 2 , 0.7 mm 2 , 0.75 mm 2 , 0.8 mm 2 , 0.85 mm 2 , 0.9 mm 2 , 0.95 mm 2 , 1 mm 2 , 1.05 mm 2 , 1.1 mm 2 , or 1.15 mm 2 , etc.; and the area of the footprint of the pad 105 on the surface side 10 can be 0.48 mm 2 ~1.2 mm 2 , for example, 0.5 mm 2 , 0.6 mm 2 , 0.7 mm 2 , 0.8 mm 2 , 0.9 mm 2 , 1 mm 2 , or 1.1 mm 2 , etc.

[0087] In some examples, with reference to Figure 7 , along the third direction Z, the length of the solder bump 106 and the length of the pad 105 can be equal, and along the second direction Y, the width of the solder bump 106 is less than the length of the pad 105.

[0088] In one example, along the third direction Z, the length of the solder bump 106 and the length of the pad 105 can each be 0.8 mm to 1.2 mm, for example, 0.85 mm, 0.9 mm, 0.95 mm, 1 mm, 1.05 mm, 1.1 mm, or 1.15 mm, etc.

[0089] In one example, the soldering block 106 can have a width of 0.2mm~0.5mm along the second direction Y, for example, 0.25mm, 0.3mm, 0.35mm, 0.4mm or 0.45mm, etc.; the soldering pad 105 can have a width of 0.6mm~1mm along the second direction Y, for example, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm or 0.95mm, etc.

[0090] In some cases, continuing to refer to Figure 7 , the photovoltaic cell can further include a plurality of soldering points 107 arranged at intervals along the second direction Y, the soldering points 107 being located between the first soldering pad 115 and the second soldering pad 125 along the second direction Y, and a single soldering point 107 being in contact with a single grid line 101; wherein the soldering point 107 includes a soldering line 117 extending along the third direction Z and an extension line 127 extending along the second direction Y, and the soldering line 117 has two opposite segments along the third direction Z, each of which is in contact with a extension line 127. In this way, the area of the normal projection of the soldering point 107 on the cell substrate 100 is similar to a H-shaped structure, wherein the soldering line 117 mainly serves to contact and connect the grid line 101 to collect carriers, and the extension line 127 mainly serves to enhance the connection stability between the subsequent soldering ribbon 43 (refer to Figure 3 or Figure 4 ) and the soldering point 107. In this way, it is beneficial to reasonably layout the normal projection shape of the soldering point 107, to ensure the good connection strength between the soldering ribbon 43 and the soldering point 107, and to reduce the light-shielding area caused by the soldering point 107 and the preparation cost of the soldering point 107. Moreover, based on the design of the soldering point 107, the photovoltaic cell can be a main grid-free cell, further reducing the preparation cost of the photovoltaic cell.

[0091] In other cases, referring to Figures 1 to 6 , the soldering point 107 can also be a long strip structure extending along the third direction Z.

[0092] In some examples, continuing to refer to Figure 7 , the photovoltaic cell can further include a connection line 108 extending along the second direction Y, located between two soldering points 107 adjacent along the second direction Y, and in contact with two soldering lines 117 adjacent along the second direction Y. In this way, the connection line 108 can directly connect the subsequent soldering ribbon 43 (refer to Figure 3 or Figure 4The welding point 107 that has the problem of virtual welding, missing welding or disconnection is electrically connected to another welding point 107. Even if part of the welding point 107 fails to contact the solder strip 43 and fails to transmit the carrier to the solder strip 43, the welding point 107 can transmit the carrier to another welding point 107 through the connecting line 108 and then to the solder strip 43. In other words, the design of the connecting line 108 helps to further ensure that the subsequent solder strip 43 can collect the carrier in all the gate lines 101, thereby further improving the photoelectric conversion efficiency of the mainless gate photovoltaic cell.

[0093] It should be noted that, Figure 6 and Figure 7 In both of Figure 6 and Figure 7 In both of

[0094] The surface side 10, the interconnection area 11, the non-interconnection area 12 and the gate line 101 will be described in detail below based on the type of photovoltaic cell.

[0095] In some embodiments, in combination with reference to Figure 3 and Figure 8 The photovoltaic cell is a cell with gate lines 101 on both surfaces, such as a TOPcon cell; the cell substrate 100 includes a first edge side 20 and a second edge side 30 opposite in the second direction Y, and two surface sides 10 opposite in the first direction X are a first surface side 110 and a second surface side 120; the gate line 101 includes a first gate line 111 on the first surface side 110 and a second gate line 121 on the second surface side 120; in the same photovoltaic cell, the interconnection area 11 includes a first interconnection area 1101 of the first surface side 110 and a second interconnection area 1201 of the second surface side 120, the non-interconnection area 12 includes a first non-interconnection area 1102 of the first surface side 110 and a second non-interconnection area 1202 of the second surface side 120, and the first interconnection area 1101 and the second non-interconnection area 1202 are close to the first edge side 20, and the first non-interconnection area 1102 and the second interconnection area 1201 are close to the second edge side 30.

[0096] In which, Figure 8 is the first partial cross-sectional view of the electric connection of three adjacent photovoltaic cells according to an embodiment of the present disclosure; in addition, Figure 3 In both of In both of

[0097] Based on this, for the first surface side 110 and the second surface side 120 of the same photovoltaic cell, the interconnection region 11 is staggered, and the non-interconnection region 12 is also staggered. For example, the first interconnection region 1101 of the first surface side 110 and the second non-interconnection region 1202 of the second surface side 120 are directly opposite each other along the first direction X, and the first non-interconnection region 1102 of the first surface side 110 and the second interconnection region 1201 of the second surface side 120 are directly opposite each other along the first direction X.

[0098] It is worth noting that when the first surface side 110 of adjacent photovoltaic cells is on the same side, the solder ribbon 43 connecting the adjacent photovoltaic cells needs to be bent from the first surface side 110 to the second surface side 120 at the interval between the adjacent photovoltaic cells. Therefore, the solder ribbon 43 will exert a large force on the two interconnect regions 11 of the adjacent photovoltaic cells. Based on this, a slanted section 104 is designed on the interconnect region 11 to avoid the solder ribbon 43 being directly opposite the bus line 114, so as to ensure that the slanted section 104 can effectively collect the charge carriers in the interconnect region 11. Furthermore, a straight section 102 is provided on the non-interconnect region 12 to avoid creating too many additional shading areas on the cell substrate 100.

[0099] In some embodiments, reference Figure 9 , Figure 9 This is a second partial cross-sectional view of three adjacent photovoltaic cells electrically connected according to an embodiment of the present disclosure. The photovoltaic cells are cells with grid lines 101 on one side, such as BC cells. The grid lines 101 are located on a surface side 10. The grid lines 101 include first grid lines 111 and second grid lines 121 arranged alternately along the second direction Y. The surface side 10 with the grid lines 101 includes a first welding area 1103 and a second welding area 1104 arranged alternately along the second direction Y. The first welding area 1103 is used to position the component that collects the current on the multiple first grid lines 111, and the second welding area 1104 is used to position the component that collects the current on the multiple second grid lines 121. Each welding area includes an interconnection area 11 and a non-interconnection area 12 opposite to each other along the second direction Y. The interconnection area 11 and the non-interconnection area 12 are arranged alternately along the second direction Y. The welding area is either the first welding area 1103 or the second welding area 1104.

[0100] It should be noted that for any given photovoltaic cell, a single welding area corresponds to one solder strip 43. Among these, Figure 9 In this example, a single solder strip 43 is located on either of the two first welding areas 1103 of two adjacent photovoltaic cells, or on either of the two second welding areas 1104 of two adjacent photovoltaic cells, to achieve parallel connection of adjacent photovoltaic cells. In practical applications, a single solder strip can also be located on the first welding area of ​​one of the two adjacent photovoltaic cells and the second welding area of ​​the other to achieve series connection of adjacent photovoltaic cells. Moreover,Figure 9 In the actual application, the first welding area of one of the two adjacent photovoltaic cells can be opposite to the second welding area of the other along the second direction Y.

[0101] In addition, Figure 9 In the actual application, the first welding area 1103, the second welding area 1104, the interconnection area 11 included in the first welding area 1103, and the non-interconnection area 12 included in the first welding area 1103, and the interconnection area 11 included in the second welding area 1104, and the non-interconnection area 12 included in the second welding area 1104 are divided in a single photovoltaic cell by the relatively dense dashed line.

[0102] It is worth noting that when the first surface side 110 of the adjacent photovoltaic cells is on the same side, the solder strip 43 can be laid on the two adjacent photovoltaic cells.

[0103] In summary, compared with the two bus lines 114 in the oblique through part 104, the extension directions of which are different, the straight through part 102 is a strip structure extending along the second direction Y. In this way, when the layout length along the second direction Y is consistent, the extension length of the straight through part 102 is smaller than that of the bus line 114, on the one hand, which is conducive to reducing the layout area of the straight through part 102 on the cell substrate 100, thereby reducing the preparation cost of the straight through part 102, on the other hand, which is conducive to reducing the area of the light-shielding region caused by the straight through part 102, so that more areas in the cell substrate 100 are not blocked to improve the total amount of light received. Moreover, the subsequent component for electrically connecting the two adjacent photovoltaic cells is generally a solder strip 43, even if the solder strip 43 extends to part of the area of the non-interconnection area 12, the orthogonal projection of the solder strip 43 on the cell substrate 100 is mostly coincided with the orthogonal projection of the straight through part 102 on the cell substrate 100, which will not cause too much additional light-shielding area on the cell substrate 100. In addition, unlike the straight through part 104 is designed on the interconnection area 11, so that the coincided area of the orthogonal projection of the oblique through part 104 on the cell substrate 100 and the orthogonal projection of the solder strip 43 on the cell substrate 100 is almost 0, which is conducive to reducing the risk of the oblique through part 104 being broken by a larger force caused by the subsequent solder strip 43, so as to reduce the risk of the oblique through part 104 being broken. Therefore, it is conducive to reducing the risk of the oblique through part 104 being broken by means of the straight through part 102 to avoid the carriers in the interconnection area 11 cannot be effectively collected, so that the solder strip 43 can collect as many carriers in each bus line 101 as possible, thereby not only can the photoelectric conversion efficiency of the photovoltaic cell be improved based on the reduction of the light-shielding area, but also the structural stability of the photovoltaic cell can be improved based on the reduction of the risk of being broken.

[0104] Further, the connecting block 103 is designed on the side of the through portion 102 away from the battery substrate 100. Even if the subsequent solder strip 43 extends to the partial area of the non-interconnected area 12 and causes a greater force on the non-interconnected area 12, the connecting and fixing effect of the connecting block 103 on the through portion 102 can reduce the risk of fracture of the through portion 102, ensure the effective collection of carriers on the non-interconnected area, and further improve the structural stability of the photovoltaic cell. Moreover, the carriers collected by the through portion 102 can be directly transmitted to the solder strip 43 in the first direction X by the connecting block 103.

[0105] Another embodiment of the present disclosure provides a photovoltaic module connected by a plurality of photovoltaic cells provided by the foregoing embodiments. The photovoltaic module provided by another embodiment of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be noted that the same or corresponding parts as the foregoing embodiments will not be described herein.

[0106] In combination with reference to Figures 1 to 11 , the photovoltaic module includes: a cell string connected by a plurality of photovoltaic cells 40 provided by the foregoing embodiments; an encapsulating adhesive film 41 for covering the surface of the cell string; and a cover plate 42 for covering the surface of the encapsulating adhesive film 41 away from the cell string.

[0107] Among them, Figure 10 is the corresponding photovoltaic module provided by another embodiment of the present disclosure Figure 8 is a partial cross-sectional schematic view of the corresponding photovoltaic module. Figure 11 is the corresponding photovoltaic module provided by another embodiment of the present disclosure Figure 9 is a partial cross-sectional schematic view of the corresponding photovoltaic module.

[0108] In some embodiments, in combination with reference to Figure 8 , Figure 10 and Figure 1 , Figure 3 , Figures 5 to 7 , the photovoltaic cell 40 is a cell with grid lines 101 on both sides, including but not limited to a TOPcon cell, a PERC cell, or a heterojunction cell.

[0109] It should be noted that in combination with reference to Figure 3 , Figure 8 or Figure 10 , a plurality of photovoltaic cells 40 can be electrically connected by a solder strip 43. Figure 3 , Figure 8 and Figure 10Only one position relationship between the photovoltaic cells 40 is shown, that is, the photovoltaic cells 40 have the same arrangement direction of the grid lines of the same polarity or in other words, each photovoltaic cell 40 has the first surface side 110 of the first grid line 111 arranged towards the same side, so that the solder strips 43 are respectively connected to different sides of two adjacent photovoltaic cells 40. In other embodiments, the photovoltaic cells can also be arranged according to the grid lines of different polarities towards the same side, that is, the grid lines of the adjacent photovoltaic cells on the same side are respectively the first grid line, the second grid line, the first grid line in order, and then the solder strips are connected to two adjacent photovoltaic cells on the same side.

[0110] In some other embodiments, in combination with reference to Figure 9 , Figure 11 and Figure 4 , the photovoltaic cells 40 are BC cells, which include but are not limited to IBC cells (Interdigitated Back Contact), HBC cells (Heterojunction Back Contact), TBC cells (TOPCon Back Contact) or HPBC cells (Hybrid Passivated Back Contact) and the like. In addition, the photovoltaic cells 40 are electrically connected in the form of a whole piece or multiple pieces to form a plurality of cell strings, and the plurality of cell strings are electrically connected in series and / or parallel. The photovoltaic cells 40 can be whole piece cells or sliced cells, which means that a complete whole piece cell is formed by a cutting process.

[0111] It should be noted that in combination with reference to Figure 4 , Figure 9 or Figure 11 , the plurality of photovoltaic cells 40 can be electrically connected by the solder strips 43. Figure 9 and Figure 11 Only one position relationship between the photovoltaic cells 40 is shown, that is, each photovoltaic cell 40 has the grid lines arranged towards the same side, so that the solder strips 43 are respectively connected to the same sides of two adjacent photovoltaic cells 40. In other embodiments, the photovoltaic cells can also be arranged according to the grid lines of the adjacent 2 photovoltaic cells respectively located on different sides, so that the solder strips are connected to two adjacent photovoltaic cells on different sides.

[0112] In some embodiments, the encapsulation film 41 comprises a first encapsulation layer covering one of the front side or the back side of the photovoltaic cell 40, and a second encapsulation layer covering the other of the front side or the back side of the photovoltaic cell 40. Specifically, at least one of the first encapsulation layer or the second encapsulation layer can be an organic encapsulation film such as a polyvinyl butyral (PVB) film, an ethylene-vinyl acetate (EVA) film, a polyolefin elastomer (POE) film, or a polyethylene terephthalate (PET) film, or at least one of the first encapsulation layer or the second encapsulation layer can also be an EP film, an EPE film, or a PVP film. The EP film refers to a co-extrusion film formed by stacking an EVA film and a POE film, the EPE film refers to a co-extrusion film formed by stacking an EVA film, a POE film, and an EVA film in sequence, and the PVP film refers to a co-extrusion film formed by stacking a POE film, an EVA film, and a POE film in sequence. The co-extrusion film can be prepared by extruding one or more raw materials onto another film that has been prepared, or by bonding different kinds of films to each other during film processing.

[0113] In some cases, the first encapsulation layer and the second encapsulation layer have a boundary before lamination, and after lamination, the photovoltaic module is formed without the concept of the first encapsulation layer and the second encapsulation layer, i.e., the first encapsulation layer and the second encapsulation layer have formed an integral encapsulation film 41.

[0114] In some embodiments, the cover plate 42 can be a glass cover plate, a plastic cover plate, or the like, which has a light-transmitting function. Specifically, the surface of the cover plate 42 facing the encapsulation film 41 can be a concave-convex surface or a suede surface comprising a plurality of convex structures, thereby increasing the utilization rate of incident light. The cover plate 42 comprises a first cover plate opposite the first encapsulation layer and a second cover plate opposite the second encapsulation layer.

[0115] In some cases, the surface of the photovoltaic cell 40 has a plurality of fine grids arranged at intervals in the second direction, and the bus bar 43 is electrically connected to the plurality of fine grids on each of the two adjacent photovoltaic cells 40 during the process of constructing a cell string using the photovoltaic cells 40.

[0116] It is understood by those skilled in the art that the above embodiments are specific embodiments for implementing the present disclosure, and various changes can be made in form and details in actual applications without departing from the spirit and scope of the embodiments of the present disclosure. Any person skilled in the art can make various modifications and changes without departing from the spirit and scope of the embodiments of the present disclosure, and therefore the protection scope of the embodiments of the present disclosure should be subject to the scope defined by the claims.

Claims

1. A photovoltaic cell, characterized by, The battery substrate has two surface sides opposite along a first direction, at least one of the surface sides includes an interconnection area and a non-interconnection area opposite along a second direction, and a connection area between the interconnection area and the non-interconnection area, the first direction is the thickness direction of the battery substrate, and the second direction intersects the first direction; a plurality of grid lines arranged at intervals along the second direction are located on at least one of the surface sides, and the grid lines extend along a third direction; a through portion is located on the non-interconnection area, and the through portion extends along the second direction; a connection block is located on a side of the through portion away from the battery substrate; an inclined through portion is located on the interconnection area, and the inclined through portion includes two bus bars intersecting in extension direction, the second direction, the third direction and the extension direction of the bus bar are located on the same plane and intersect with each other in pairs; wherein the interconnection area is a region on the surface side provided with components for electrically connecting two adjacent photovoltaic cells, and the non-interconnection area is a region on the surface side not provided with components for electrically connecting two adjacent photovoltaic cells. The number of connection blocks in contact with a single through portion is multiple; wherein adjacent two connection blocks located on the same through portion are arranged at intervals, or adjacent two connection blocks located on the same through portion are in contact.

2. The photovoltaic cell of claim 1, wherein, The orthographic projection shape of the connection block on the surface side is a quadrilateral, and one diagonal of the quadrilateral is located in the orthographic projection of the through portion on the surface side.

3. Photovoltaic cell according to claim 1 or 2, characterized in that Further comprising:

4. The photovoltaic cell of claim 1, wherein, a first pad in contact with the through portion is located on a region in the connection area close to the non-interconnection area; a second pad in contact with the inclined through portion is located on a region in the connection area close to the interconnection area; wherein the first pad is in contact with at least one grid line, and the second pad is in contact with at least one grid line. Further comprising:

5. The photovoltaic cell of claim 4, wherein, a plurality of welding blocks arranged at intervals along the second direction, the welding blocks are located between the first pad and the second pad adjacent along the second direction, and the orthographic projection area of the welding block on the surface side is smaller than the orthographic projection area of the pad on the surface side, the pad is the first pad or the second pad. The orthographic projection area of the connection block on the surface side is smaller than or equal to the orthographic projection area of the welding block on the surface side.

6. The photovoltaic cell of claim 5, wherein, The ratio of the orthographic projection area of the welding block on the surface side to the orthographic projection area of the pad on the surface side is 0.25-0.

625.

7. Photovoltaic cell according to claim 5 or 6, characterized in that Further comprising:

8. Photovoltaic cell according to claim 4 or 5, characterized in that a plurality of welding points arranged at intervals along the second direction, the welding points are located between the first pad and the second pad adjacent along the second direction, and a single welding point is in contact with a single grid line; wherein the welding point includes a welding line extending along the third direction and an extension line extending along the second direction, and each of the two opposite segments of the welding line along the third direction is in contact with a welding line. Further comprising:

9. The photovoltaic cell of claim 8, wherein, ​ A connection line extending along the second direction is located between and in contact with two adjacent soldering lines along the second direction.

10. The photovoltaic cell of claim 1, wherein, The battery substrate includes a first edge side and a second edge side opposite along the second direction, and a first surface side and a second surface side opposite along the first direction; The gate lines include a first gate line located on the first surface side and a second gate line located on the second surface side; In the same photovoltaic cell, the interconnection region includes a first interconnection region on the first surface side and a second interconnection region on the second surface side, and the non-interconnection region includes a first non-interconnection region on the first surface side and a second non-interconnection region on the second surface side, the first interconnection region and the second non-interconnection region are close to the first edge side, and the first non-interconnection region and the second interconnection region are close to the second edge side.

11. The photovoltaic cell of claim 1, wherein, The gate lines are located on one surface side, and the gate lines include first gate lines and second gate lines arranged alternately along the second direction; the surface side provided with the gate lines includes first soldering regions and second soldering regions arranged alternately along the second direction, the first soldering regions are used for positioning components for collecting current on a plurality of the first gate lines, and the second soldering regions are used for positioning components for collecting current on a plurality of the second gate lines; Each soldering region includes the interconnection region and the non-interconnection region opposite along the second direction, and the interconnection region and the non-interconnection region are arranged alternately along the second direction, and the soldering region is the first soldering region or the second soldering region.

12. A photovoltaic module, characterized by, It includes: A battery string connected by a plurality of photovoltaic cells according to any one of claims 1 to 11; An encapsulation film for covering the surface of the battery string; A cover plate for covering the surface of the encapsulation film away from the battery string.

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