Solar cell and photovoltaic module

Abstract

The utility model discloses a solar cell and a photovoltaic module, the solar cell comprises a cell body, the surface of the cell body is provided with a plurality of first fine grids and second fine grids which extend along a second direction and are alternately spaced along a first direction; a plurality of electric combination parts are arranged on the surface of the battery body, and each group of electric combination parts comprises a group of collinear first electric combination parts and a group of collinear second electric combination parts; each group of electric combination parts is provided with a first center line, the first group of electric combination parts are arranged close to the edge of the battery body, and the vertical distance D between the first center line of the first group of electric combination parts and the adjacent edge of the battery body and the width W of the battery body in the first direction meet the formula: 0.03 < = D / W < = 0.09. Therefore, the D / W is set in a reasonable range, so that the electric combination part has a certain distance from the edge of the battery body, the electric combination part is prevented from being too close to the edge of the battery body, and the hidden crack risk during welding in the subsequent process is reduced while the current collection in the fine grid is met.

Description

Technical Field

[0001] This application belongs to the field of solar cell technology, specifically relating to a solar cell and a photovoltaic module. Background Technology

[0002] A back-contact solar cell is a specially designed solar cell whose main feature is that the conductive lines and contact points of the cell are placed on the back, thereby improving light transmittance and photoelectric conversion efficiency.

[0003] In related technologies, the edge welding position in solar cells is close to the edge of the cell, which makes it easy for microcracks to occur during subsequent welding due to its proximity to the cell edge. Utility Model Content

[0004] This application aims to provide a solar cell and a photovoltaic module that can solve the problem in related technologies where the edge welding position of a solar cell is too close to the edge of the cell, which makes it easy for microcracks to occur during subsequent welding due to the proximity to the edge of the cell.

[0005] To solve the above-mentioned technical problems, this application is implemented as follows:

[0006] In a first aspect, embodiments of this application propose a solar cell, comprising: a cell body, the surface of which is provided with a plurality of first fine grids and a plurality of second fine grids extending along a second direction and alternately spaced along a first direction, the first direction intersecting the second direction; the surface of the cell body is provided with a plurality of electrical connection portions, each electrical connection portion including a first electrical connection portion electrically connected to at least one first fine grid and a second electrical connection portion electrically connected to at least one second fine grid; the electrical connection portions are in multiple groups, each group of electrical connection portions including a group of a plurality of first electrical connection portions collinear along the first direction and a group of a plurality of second electrical connection portions collinear along the first direction; each group of electrical connection portions has a first centerline along the second direction, the multiple groups of electrical connection portions including a first group of electrical connection portions disposed near the edge of the cell body, the vertical distance between the first centerline of the first group of electrical connection portions and the adjacent edge of the cell body is D, and the width of the cell body along the second direction is W, satisfying: 0.03≤D / W≤0.09.

[0007] Optionally, the distance between the first centerline of two adjacent electrical junctions is S, satisfying: 0.8≤S / D≤2.

[0008] Optionally, along the first direction, in each group of electrical connections, one group of the first electrical connections is collinear with a first straight line, and one group of the second electrical connections is collinear with a second straight line; along the second direction, the distance between the first straight line and the second straight line in each group of electrical connections is T, satisfying: 2≤D / T≤14.

[0009] Optionally, the distance between the first centerlines of two adjacent sets of electrical joints is S; along the first direction, in each set of electrical joints, one set of the first electrical joints is collinear with a first straight line, and one set of the second electrical joints is collinear with a second straight line; along the second direction, the distance between the first straight line and the second straight line in each set of electrical joints is T, and the ratio of D:T:S ranges from 2:1:1.6 to 14:1:28.

[0010] Optionally, the solar cell further includes an edge connection electrode, which is electrically connected to the first or second grid located near the edge of the cell body along the first direction.

[0011] Optionally, the first fine grid is disconnected at a position corresponding to the second electrical connection to form a plurality of first sub-fine grids, each of the first sub-fine grids having a first electrical connection; the first sub-fine grid includes a first end and a second end opposite to each other along the second direction, and the distance from the first end to the corresponding first electrical connection is not equal to the distance from the second end to the corresponding first electrical connection;

[0012] And / or, the second fine gate is disconnected at a position corresponding to the first electrical junction to form a plurality of second sub-fine gates, the second sub-fine gate including a third end and a fourth end opposite to each other along the second direction, the distance from the third end to the corresponding second electrical junction is not equal to the distance from the fourth end to the corresponding second electrical junction.

[0013] Optionally, the solar cell satisfies at least one of the following conditions:

[0014] A. The vertical distance D between the first centerline of the first group of electrical junctions and the adjacent edge of the battery body satisfies: 7mm <D<15mm;

[0015] B. The distance T between the first straight line and the second straight line in each electrical junction satisfies: 0.8mm≤T≤4mm;

[0016] C. The width W of the battery body along the second direction satisfies: 160mm≤W≤260mm.

[0017] Optionally, along the first direction, a plurality of first fine grids and a plurality of second fine grids are arranged at equal intervals.

[0018] Optionally, the solar cell further includes a first conductive element and a second conductive element, wherein the first conductive element is electrically connected to a plurality of first electrical junctions in the same group of electrical junctions, and the second conductive element is electrically connected to a plurality of second electrical junctions in the same group of electrical junctions.

[0019] Optionally, along the first direction, the width of the first electrical connection portion is greater than the width of the portion of the first fine gate excluding the first electrical connection portion;

[0020] And / or, along the first direction, the width of the second electrical connection portion is greater than the width of the portion of the second fine gate excluding the second electrical connection portion.

[0021] Optionally, the solar cell further includes a first insulating element disposed between the first fine grid and the second conductive element;

[0022] And / or, the solar cell further includes a second insulating element disposed between the second fine grid and the first conductive element.

[0023] Secondly, embodiments of this application provide a photovoltaic module, including an interconnecting element and a solar cell as described in any of the preceding claims, wherein the interconnecting element is electrically connected to the electrical junction.

[0024] Optionally, in photovoltaic modules, along different cell string arrangement directions, 0, 1, or 2 sets of electrical junctions are provided between adjacent electrical interconnects of adjacent solar cells.

[0025] In embodiments of this application, the solar cell includes a cell body. The surface of the cell body is provided with a plurality of first grids and a plurality of second grids extending along a second direction and alternately spaced along a first direction, the first direction intersecting the second direction. The surface of the cell body is provided with a plurality of electrical connection portions, each electrical connection portion including a first electrical connection portion electrically connected to at least one first grid and a second electrical connection portion electrically connected to at least one second grid. The electrical connection portions are in multiple groups, each group of electrical connection portions including a group of a plurality of first electrical connection portions collinear along the first direction and a group of a plurality of second electrical connection portions collinear along the first direction. Each group of electrical connection portions has a first centerline along the second direction. The multiple groups of electrical connection portions include a first group of electrical connection portions disposed near the edge of the cell body. The vertical distance between the first centerline of the first group of electrical connection portions and the adjacent edge of the cell body is D. The width of the cell body along the first direction is W, satisfying: 0.03≤D / W≤0.09. By setting the D / W ratio within a reasonable range, the first or second electrical junction is kept at a certain distance from the edge of the battery body, thus avoiding the first or second electrical junction from being too close to the edge of the battery body. This satisfies the current collection in the first or second grid while reducing the risk of microcracks during welding in subsequent processes.

[0026] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0027] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 This is a schematic diagram of a first type of solar cell according to an embodiment of this application;

[0029] Figure 2 This is a schematic diagram of a second type of solar cell according to an embodiment of this application;

[0030] Figure 3 This is a schematic diagram of a first type of photovoltaic module according to an embodiment of this application;

[0031] Figure 4 This is a schematic diagram of a second type of photovoltaic module according to an embodiment of this application;

[0032] Figure 5 This is a partial schematic diagram of a solar cell according to an embodiment of this application;

[0033] Figure 6 This is another partial schematic diagram of a solar cell according to an embodiment of this application.

[0034] Figure label:

[0035] 1: Battery body; 12: First center line; 2: First grid; 20: Electrical connection; 201: First electrical connection; 21: First electrical connection; 22: First straight line; 23: First sub-grid; 231: First end; 232: Second end; 3: Second grid; 31: Second electrical connection; 32: Second straight line; 33: Second sub-grid; 331: Third end; 332: Fourth end; 40: Edge connecting electrode; 4: First conductive element; 5: Second conductive element; 6: First insulating element; 7: Second insulating element; 8: First interconnecting element; 9: Second interconnecting element; X: First direction; Y: Second direction. Detailed Implementation

[0036] The embodiments of this application will now be described in detail. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0037] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0038] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0039] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] Before explaining the solar cells and photovoltaic modules provided in the embodiments of this application, the application scenarios of the solar cells and photovoltaic modules provided in the embodiments of this application will be specifically described first:

[0041] In back-contact solar cells, the electrode structure is located entirely on the back side of the cell, with no electrodes obstructing the front. Therefore, back-contact solar cells exhibit higher short-circuit current and photoelectric conversion efficiency, making them one of the current technological directions for achieving high-efficiency crystalline silicon solar cells. For back-contact solar cells, the structure and electrode pattern design concentrated on the back side are the core of the technology.

[0042] In related technologies, in order to effectively utilize the fine grid in the edge region of solar cells, one approach is to form a hook structure in the fine grid at the edge of the solar cell and set the main grid at the outermost edge of the solar cell to collect the current generated in the fine grid. However, such a structure makes the current collection capacity of the main grid uneven. Another approach is to set a solder ribbon near the edge of the solar cell to collect the current in the fine grid at the edge through the solder ribbon. However, because the solder ribbon is too close to the edge of the solar cell, it is easy to cause defects such as microcracks in subsequent processes.

[0043] Therefore, this application provides a solar cell and a photovoltaic module. The following description, in conjunction with the accompanying drawings, details the solar cell and photovoltaic module provided in this application through specific embodiments and application scenarios.

[0044] Solar cells according to some embodiments of this application, such as Figure 1As shown, the battery body 1 has a plurality of first fine grids 2 and a plurality of second fine grids 3 extending along a second direction Y and alternately spaced along a first direction X. The first direction X intersects the second direction Y. The surface of the battery body 1 has a plurality of electrical connection portions 20, each electrical connection portion 20 including a first electrical connection portion 21 electrically connected to at least one first fine grid 2 and a second electrical connection portion 31 electrically connected to at least one second fine grid 3. Each group of electrical connection portions has a first centerline 12 along the second direction Y. The plurality of groups of electrical connection portions 20 include a first group of electrical connection portions 201 disposed near the edge of the battery body 1. The vertical distance between the first centerline 12 of the first group of electrical connection portions 201 and the adjacent edge of the battery body 1 is D. The width of the battery body 1 along the second direction Y is W, satisfying: 0.03≤D / W≤0.09.

[0045] In this embodiment, by setting the ratio D / W between the vertical distance D between the first centerline 12 of the first electrical connection portion 201 and the adjacent edge of the battery body 1 and the width W of the battery body 1 along the second direction Y to be within a reasonable range, the first electrical connection portion 21 or the second electrical connection portion 31 is at a certain distance from the edge of the battery body 1, thereby avoiding the first electrical connection portion 21 or the second electrical connection portion 31 being too close to the edge of the battery body 1. While satisfying the current collection in the first fine grid 2 or the second fine grid 3, the risk of microcracks during welding in subsequent processes is reduced.

[0046] It should be noted that the first direction X is the length direction of the solar cell, and the second direction Y is the width direction of the solar cell. In a solar cell, the fine grid, also known as the subgrid (finer electrodes), is where the semiconductor material (such as silicon) absorbs photons and generates electron-hole pairs, i.e., photogenerated charge carriers, when sunlight shines on the cell. These photogenerated charge carriers can be quickly discharged through the fine grid to form a current. The fine grid includes a first fine grid 2 and a second fine grid 3. Taking a back-contact cell as an example, one is the positive electrode fine grid and the other is the negative electrode fine grid. The flow direction of the photogenerated charge carriers collected in the two grids is opposite, and the two grids form a loop to discharge the current.

[0047] Understandably, the plurality of first fine grids 2 and the plurality of second fine grids 3 can be alternately spaced, and the plurality of first fine grids 2 and the plurality of second fine grids 3 can be equally spaced or non-equally spaced; the material of the first fine grids 2 and the second fine grids 3 can be at least one of silver, aluminum, copper, copper plating, etc. When the solar cell is a non-back contact cell, the plurality of first fine grids 2 and the plurality of second fine grids 3 can be alternately spaced, or they can be connected by the electrical connection portion 20. Those skilled in the art can configure them according to actual needs, and this application does not impose any restrictions on this.

[0048] In specific applications, the first electrical connection 21 and the second electrical connection 31 specifically refer to at least one of the following: an electrical connection point (pad, also called a solder pad or contact point) that leads the current out of the first fine gate 2 or the second fine gate 3; a section of the fine gate; a thickened section of the fine gate; a section of the main gate (busbars); a thickened section of the main gate; a fine gate connecting line (a connecting line connecting at least two fine gates); or conductive adhesive dots. The first electrical connection 21 can be electrically connected to one first fine gate 2, such as a pad or a thickened section of the fine gate, or it can be electrically connected to multiple first fine gates 2, such as a section of the main gate or a fine gate connecting line. The second electrical connection 31 can be electrically connected to one second fine gate 3, such as a pad, or it can be electrically connected to multiple second fine gates 3, such as the main gate. In practical applications, the first electrical connection portion 21 and the second electrical connection portion 31 of the back contact solar cell are both located on the back side of the cell body 1, so that the first electrical connection portion 21 and the second electrical connection portion 31 are staggered in the first direction X and the second direction Y to reduce the risk of short circuit.

[0049] It should be noted that when the first electrical connection 21 and the second electrical connection 31 are pad points, the first electrical connection 21 and the first fine grid 2 can be integrally formed or separately formed, and the second electrical connection 31 and the second fine grid 3 are similarly set; the pad point can be any shape such as round, square, elliptical, or rhomboid, and those skilled in the art can set it according to actual needs, and this application does not limit it in this regard.

[0050] It needs to be explained that, such as Figure 1 As shown in the dashed box, the electrical junction 20 is divided into multiple groups. A group of multiple first electrical junctions 21 and a group of multiple second electrical junctions 31 form a group of electrical junctions 20. That is, the first electrical junctions 21 and the second electrical junctions 31 appear in pairs. This makes the collection paths of photogenerated carriers in the first fine gate 2 and the second fine gate 3 approximately equal, reducing local resistance losses caused by uneven current distribution. Figure 1 As shown in the leftmost dashed box, the collection path of the first electrical bonding part 21 to the left of the first fine grid 2 is approximately equal to the collection path of the second electrical bonding part 31 to the left of the second fine grid 3; at the same time, it can make the force more uniform and reduce stress concentration during subsequent welding or bonding; and it also facilitates subsequent processing.

[0051] Understandably, in a group of electrical junctions 20, multiple first electrical junctions 21 are collinear along the first direction X. Specifically, multiple first electrical junctions 21 may be collinear along their edge lines in the second direction Y, or they may be collinear along their center lines in the second direction Y. As long as the uniformity of the collection path can be guaranteed, it is acceptable. The collinear arrangement of multiple second electrical junctions 31 is similar and will not be elaborated here. Those skilled in the art can make the arrangement according to actual needs, and this application does not impose any restrictions on it.

[0052] It should be noted that each electrical junction 20 has a first centerline 12 along the second direction Y, specifically, as shown in the figure. Figure 1 As shown in the dashed box, multiple first electrical connections 21 are collinear on a first straight line 22, and multiple second electrical connections 31 are collinear on a second straight line 32. The first center line 12 is the center line of the first straight line 22 and the second straight line 32 along the second direction Y; it can also be the geometric center line of each group of electrical connections 20 along the second direction Y, that is, the perpendicular distance between the first center line 12 and the first electrical connection 21 along the second direction Y is equal to the perpendicular distance between the first center line 12 and the second electrical connection 31 along the second direction Y.

[0053] In specific applications, such as Figure 1 As shown, the multiple sets of electrical connections 20 include a first set of electrical connections 201 disposed near the edge of the battery body 1, such as... Figure 1 As shown in the leftmost dashed box, the group of electrical connections 20 closest to the edge of the battery body 1 along the second direction Y is the first group of electrical connections 201. Alternatively, it could be the group of electrical connections 20 closest to the rightmost edge of the battery body 1 along the second direction Y. The vertical distance D between the first centerline 12 of the first group of electrical connections 201 and the adjacent edge of the battery body 1 is as follows: Figure 1 As shown in the leftmost dashed box, the leftmost dashed box contains the first electrical connection part 201. The vertical distance between the first centerline 12 of the first electrical connection part 201 along the first direction X and the leftmost edge of the battery body 1 is D. The width of the battery body 1 along the second direction Y is W, and 0.03≤D / W≤0.09.

[0054] It should be noted that when the ratio D / W between the vertical distance D between the first centerline 12 of the first electrical junction 201 and the edge of the adjacent battery body 1 and the width W of the battery body 1 along the second direction Y is less than 0.03, that is, when the first electrical junction 201 is too close to the edge of the adjacent battery body 1, not only will the current collection path of the first electrical junction 201 be too short, but it will also cause the risk of microcracks in the first fine grid 2 or the second fine grid 3 during welding in subsequent processes. On the other hand, when the ratio D / W between the vertical distance D between the first centerline 12 of the first electrical junction 201 and the edge of the adjacent battery body 1 and the width W of the battery body 1 along the second direction Y is greater than 0.09, that is, when the first electrical junction 201 is too far from the edge of the adjacent battery body 1, the collection ability of photogenerated carriers in the first fine grid 2 or the second fine grid 3 at the farthest end of the first electrical junction 201 will decrease, thereby reducing the current collection efficiency.

[0055] Specifically, the ratio D / W between the vertical distance D between the first centerline 12 of the first electrical junction 201 and the adjacent edge of the battery body 1 and the width W of the battery body 1 along the second direction Y can be set to any value or a range between any two values, such as 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09.

[0056] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, the distance between the first center line 12 of two adjacent electrical junctions 20 is S, which satisfies: 0.8≤S / D≤2.

[0057] In this embodiment, by setting the ratio S / D between the spacing S between the first center lines 12 of two adjacent electrical junctions 20 and the vertical distance D between the first center line 12 of the first electrical junction 201 and the edge of the adjacent battery body 1 to be within a reasonable range, a certain distance is maintained between the first electrical junction 201 and the edge of the adjacent battery body 1, while ensuring that the arrangement of the electrical junctions 20 is not too dense and causes shading. At the same time, the current collection paths of the first electrical junction 21 and the second electrical junction 31 are made to be nearly the same, thus improving the balance of current collection.

[0058] It needs to be explained that when the ratio S / D of the distance between the first center lines 12 of two adjacent sets of electrical junctions 20 and the vertical distance D between the first center line 12 of the first set of electrical junctions 201 and the edge of the adjacent battery body 1 is less than 0.8, that is, when the distance S between the first center lines 12 of two adjacent sets of electrical junctions 20 is too small, the distance between multiple sets of electrical junctions 20 along the second direction Y is too small, that is, the multiple sets of electrical junctions 20 are arranged too densely, which not only causes waste but also creates obstruction and reduces the generation efficiency of photogenerated carriers; while when the ratio S / D of the distance S between the first center lines 12 of two adjacent sets of electrical junctions 20 and the vertical distance D between the first center line 12 of the first set of electrical junctions 201 and the edge of the adjacent battery body 1 is greater than 2, that is, when the distance S between the first center lines 12 of two adjacent sets of electrical junctions 20 is too large, such as Figure 1 and Figure 2 As shown, the current collection paths on the left and right sides of the same electrical joint 20 along the second direction are too long, which reduces the current collection efficiency. In addition, the vertical distance between the first set of electrical joints 201 and the edge of the adjacent battery body 1 is too close, which may cause hidden cracks during welding in subsequent processes.

[0059] In specific applications, the ratio S / D of the distance S between the first center line 12 of two adjacent electrical junctions 20 and the vertical distance D between the first center line 12 of the first electrical junction 201 and the edge of the adjacent battery body 1 can be set to any value or a range between any two values, such as 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2.

[0060] It should be noted that two adjacent sets of electrical junctions 20 can be any two adjacent sets of electrical junctions 20, such as... Figure 1 or Figure 2 The two dashed boxes can be either the leftmost or the rightmost. In actual measurement, the distance S along the second direction Y is taken as the geometric center of two adjacent electrical junctions 20.

[0061] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, along the first direction X, in each group of electrical joints 20, a group of first electrical joints 21 are collinear with a first straight line 22, and a group of second electrical joints 31 are collinear with a second straight line 32; along the second direction Y, the distance between the first straight line 22 and the second straight line 32 in each group of electrical joints 20 is T, which satisfies: 2≤D / T≤14.

[0062] In this embodiment, by setting the ratio D / T between the vertical distance D between the first center line 12 of the first group of electrical junctions 201 and the edge of the adjacent battery body 1 and the distance T between the first straight line 22 and the second straight line 32 in each group of electrical junctions 20 to be within a reasonable range, it is possible to ensure the electrical isolation range and the space requirements during subsequent welding processes, while making the current collection paths of the first electrical junction 21 and the adjacent second electrical junction 31 approach and equal, thereby improving the current collection efficiency.

[0063] It needs to be explained that when the ratio D / T between the vertical distance D between the first center line 12 of the first group of electrical junctions 201 and the adjacent edge of the battery body 1 and the spacing T between the first straight line 22 and the second straight line 32 in each group of electrical junctions 20 is less than 2, that is, when the spacing T between the first straight line 22 and the second straight line 32 in each group of electrical junctions 20 is too large, the photogenerated carriers on the first fine grid 2 or the second fine grid 3 need to travel a longer path to reach the first electrical junction 21 or the second electrical junction 31, and there may be local current density that is too high. This can lead to issues with the left and right sides of the first electrical junction 21 and the second electrical junction 31 in the same group of electrical junctions 20. The current collection paths differ too much, resulting in poor collection uniformity. When the ratio D / T between the vertical distance D between the first center line 12 of the first electrical junction 201 and the edge of the adjacent battery body 1 and the distance T between the first straight line 22 and the second straight line 32 in each electrical junction 20 is greater than 14, that is, when the distance T between the first straight line 22 and the second straight line 32 in each electrical junction 20 is too small, two interconnecting solder strips need to be welded to the first electrical junction 21 and the second electrical junction 31 respectively during subsequent welding. Since the interconnecting solder strips themselves have a certain width, the two interconnecting solder strips are prone to short circuit, and the process difficulty is relatively high.

[0064] In specific applications, the ratio D / T between the vertical distance D between the first center line 12 of the first group of electrical junctions 201 and the edge of the adjacent battery body 1 and the distance T between the first straight line 22 and the second straight line 32 in each group of electrical junctions 20 can be set to any value or a range between any two values, such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14.

[0065] It should be noted that the first straight line 22 specifically refers to the line in which a group of first electrical connections 21 in the same group of electrical connections 20 are collinear along the first direction X. Specifically, it can be the edge line of multiple first electrical connections 21. For example, when the first electrical connection 21 is the main gate, the first straight line 22 is the left or right line of the main gate. Alternatively, it can be the line connecting the center lines of multiple first electrical connections 21. For example, when the first electrical connection 21 is a pad point, multiple pads are connected along the center line of the second direction Y in the first direction X to form the first straight line 22. The setting of the second straight line 32 is the same as that of the first straight line 22, and will not be repeated here. Those skilled in the art can set it according to actual needs, and this application does not limit it.

[0066] In actual measurement, the distance between the geometric center of the first electrical connection 21 and the geometric center of the second electrical connection 31 along the second direction Y in the same group of electrical connections 20 can be measured, which is the distance T between the first straight line 22 and the second straight line 32 in the same group of electrical connections 20. Of course, it can also be the distance between two edge lines.

[0067] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, the distance between the first centerline 12 of two adjacent sets of electrical joints 20 is S; along the first direction X, in the electrical joints 20, a set of first electrical joints 21 are collinear on the first straight line 22, and a set of second electrical joints 31 are collinear on the second straight line 32; along the second direction Y, the distance between the first straight line 22 and the second straight line 32 in each set of electrical joints 20 is T, and the ratio of D:T:S ranges from 2:1:1.6 to 14:1:28.

[0068] In this embodiment, by setting the ratio D:T:S between the vertical distance D between the first center line 12 of the first group of electrical joints 201 and the edge of the adjacent battery body 1, the distance T between the first straight line 22 and the second straight line 32 in each group of electrical joints 20, and the distance S between the first center lines 12 of two adjacent groups of electrical joints 20 to a reasonable range, multiple groups of electrical joints 20 can be evenly spaced along the second direction Y, while ensuring that the first group of electrical joints 201 is not too close to the edge of the adjacent battery body 1, reducing the risk of microcracks during subsequent welding, and improving the current collection efficiency of the electrical joints 20.

[0069] It should be explained that when the ratio of the vertical distance D between the first centerline 12 of the first group of electrical junctions 201 and the edge of the adjacent battery body 1, the distance T between the first straight line 22 and the second straight line 32 in each group of electrical junctions 20, and the distance S between the first centerlines 12 of two adjacent groups of electrical junctions 20, D:T:S, is in the range of 2:1:1.6 to 14:1:28, the first group of electrical junctions 201 is at a certain distance from the edge of the adjacent battery body 1. In subsequent welding processes, this reduces the possibility of microcracks in the first fine grid 2 or the second fine grid 3 at the edge of the battery body 1, while ensuring that the distance between the first straight line 22 and the second straight line 32 is within a reasonable range. This reduces the risk of short circuits and also improves the convergence of current collection paths on both sides of the electrical junction 20. Furthermore, it allows multiple groups of electrical junctions 20 to be evenly spaced along the second direction Y, resulting in balanced current collection in each group of electrical junctions 20 and improving the overall current collection efficiency of the solar cell.

[0070] In specific applications, the ratio D:T:S between the vertical distance D between the first center line 12 of the first group of electrical junctions 201 and the edge of the adjacent battery body 1, the distance T between the first straight line 22 and the second straight line 32 in each group of electrical junctions 20, and the distance S between the first center lines 12 of two adjacent groups of electrical junctions 20 can be set to any ratio such as 2:1:1.6, 5:1:8, 10:1:20, 14:1:28, or a range between two arbitrary ratios.

[0071] Understandably, since the width of the battery body 1 along the second direction Y is a fixed value in the actual product, by setting D:T:S within a reasonable range, multiple sets of electrical junctions 20 with a certain distance from the edge of the battery body 1 and reasonable distribution can be formed on the specific battery body 1 to collect current, thereby improving the efficiency of current collection.

[0072] In some embodiments of this application, such as Figure 5 As shown, the solar cell also includes an edge connection electrode 40, which is electrically connected to a first grid 2 or a second grid 3 located at the edge of the cell body 1 along the first direction X.

[0073] In this embodiment, by setting an edge connection electrode 40 at the edge position along the first direction X of the battery body 1, the current in the first fine grid 2 or the second fine grid 3 at the edge of the battery body 1 can be collected, reducing the setting of the electrical junction 20 at the edge of the battery body 1 and reducing the impact of welding in subsequent processes; at the same time, the current in the fine grid at the edge of the battery body 1 can be effectively collected, ensuring current collection efficiency, reducing transmission loss, and effectively increasing the light-receiving area.

[0074] In specific applications, the edge connection electrode 40, such as Figure 5As shown, extending along the first direction X, multiple first fine grids 2 at the edge of the battery body 1 in the first direction X are electrically connected, thereby concentrating the current in the multiple first fine grids 2 at the edge and reducing losses during transmission; multiple edge connection electrodes 40 can be provided, and can be provided on both sides of the battery body 1 along the first direction X. The connection principle of the edge connection electrode 40 and the second fine grid 3 is the same, and will not be described again here.

[0075] It should be noted that the material of the edge connecting electrode 40 can be at least one of silver paste, copper plating, or conductive polymer, and its width is between 0.5 mm and 3 mm. Processing through printing, laser processing, electroplating, deposition, etc., can not only improve the current collection capacity, but also improve the bending resistance at the edge of the battery body 1.

[0076] In some embodiments of this application, such as Figure 6 As shown, the first fine grid 2 is disconnected at the position corresponding to the second electrical connection portion 31 to form a plurality of first sub-fine grids 23, and each first sub-fine grid 23 is provided with a first electrical connection portion 21; the first sub-fine grid 23 includes a first end 231 and a second end 232 opposite to each other along the second direction Y, and the distance from the first end 231 to the corresponding first electrical connection portion 21 is not equal to the distance from the second end 232 to the corresponding first electrical connection portion 21.

[0077] In this embodiment, by disconnecting the first fine grid 2 at the position corresponding to the second electrical junction 31 to form multiple first sub-fine grids 23, it is not necessary to provide an insulating component or insulating layer between the interconnect welded to the second electrical junction 31 and the first fine grid 2 in subsequent processes. This simplifies the overall structure, reduces processing steps, and lowers the risk of short circuits. Furthermore, the distance from the first end 231 of the first sub-fine grid 23 to the corresponding first electrical junction 21 is not equal to the distance from the second end 232 to the corresponding first electrical junction 21. This allows heat to be dispersed to different regions rather than concentrated at a single point, reducing the probability of hot spot burnout. At the same time, each first electrical junction 21 only collects current from the corresponding first sub-fine grid 23, which improves current collection efficiency. Overall, the total length of the first fine grid 2 is shortened, which means the effective path for current collection is shortened.

[0078] Understandably, the first fine gate 2 is disconnected at the position corresponding to the second electrical connection 31, meaning that the first fine gate 2 is not continuous along the second direction Y. Of course, in practical applications, the first fine gate 2 can also be continuous along the second direction Y, such as... Figure 1 and Figure 2 The multiple first fine gates 2 can be continuous or discontinuous, or they can be partially continuous or partially discontinuous. Those skilled in the art can set them according to actual needs, and this application does not limit them.

[0079] In some embodiments of this application, such as Figure 6 As shown, the second fine gate 3 is disconnected at the position corresponding to the first electrical junction 21 to form a plurality of second sub-fine gates 33. The second sub-fine gate 33 includes a third end 331 and a fourth end 332 opposite to each other along the second direction Y. The distance from the third end 331 to the corresponding second electrical junction 31 is not equal to the distance from the fourth end 332 to the corresponding second electrical junction 31.

[0080] In this embodiment, by disconnecting the second fine grid 3 at the position corresponding to the first electrical connection 21 to form multiple second sub-fine grids 33, it is not necessary to provide an insulating component or insulating layer between the interconnect welded to the first electrical connection 21 and the second fine grid 3 in subsequent processes. This simplifies the overall structure, reduces processing steps, and lowers the risk of short circuits. Furthermore, the distance from the third end 331 of the second sub-fine grid 33 to the corresponding second electrical connection 31 is not equal to the distance from the fourth end 332 to the corresponding second electrical connection 31, causing heat to be dispersed to different regions rather than concentrated at a single point, reducing the probability of hot spot burnout. At the same time, each second electrical connection 31 only collects the current on the corresponding second sub-fine grid 33, which improves the current collection efficiency. Overall, the total length of the second fine grid 3 is shortened, which means the effective path for current collection is shortened.

[0081] Understandably, the second fine gate 3 is disconnected at the position corresponding to the first electrical connection 21, meaning that the second fine gate 3 is not continuous along the second direction Y. Of course, in practical applications, the second fine gate 3 can also be continuous along the second direction Y, such as... Figure 1 and Figure 2 The multiple second fine gates 3 can be continuous or discontinuous, or they can be partially continuous or partially discontinuous. Those skilled in the art can set them according to actual needs, and this application does not limit them.

[0082] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, the vertical distance D between the first centerline 12 of the first electrical junction 201 and the adjacent edge of the battery body 1 satisfies: 7mm. <D<15mm。

[0083] In this embodiment of the application, by setting the vertical distance D between the first center line 12 of the first group of electrical junctions 201 and the adjacent edge of the battery body 1 within a reasonable range, the risk of microcracks occurring at the first fine grid 2 or the second fine grid 3 at the edge of the battery body 1 during welding in subsequent processes can be reduced. At the same time, the current in the first fine grid 2 or the second fine grid 3 at the edge can be effectively collected, thereby improving the overall current collection capability of the solar cell.

[0084] It should be explained that when the vertical distance D between the first center line 12 of the first electrical connection 201 and the edge of the adjacent battery body 1 is ≤ 7mm, that is, when the first electrical connection 201 is too close to the edge of the adjacent battery body 1, there is a risk of microcracks occurring at the first fine grid 2 or the second fine grid 3 at the edge of the battery body 1 during subsequent welding processes. On the other hand, when the vertical distance D between the first center line 12 of the first electrical connection 201 and the edge of the adjacent battery body 1 is ≥ 15mm, that is, when the first electrical connection 201 is too far from the edge of the adjacent battery body 1, the first electrical connection 201 cannot effectively collect the current in the fine grid at the edge of the battery body 1, and when the current collection path is too long, it is easy to cause losses or form local high resistance points, resulting in damage. At the same time, the bending resistance at the edge of the solar cell is reduced.

[0085] In specific applications, the vertical distance D between the first centerline 12 of the first electrical junction 201 and the edge of the adjacent battery body 1 can be set to any value or a range between two arbitrary values, such as 7.5mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 14.5mm.

[0086] In actual measurement, the distance between one edge of the battery body 1 along the second direction Y and the geometric center of the nearest set of electrical junctions 20 along the second direction Y can be measured, which is the vertical distance D.

[0087] In some embodiments of this application, the distance T between the first straight line 22 and the second straight line 32 in each group of electrical junctions 20 satisfies: 0.8mm≤T≤4mm.

[0088] In this embodiment, by setting the distance T between the first straight line 22 and the second straight line 32 in each group of electrical joints 20 within a reasonable range, it is possible to ensure the electrical isolation range and the space requirements during subsequent welding processes, while making the current collection paths of the first electrical joint 21 and the adjacent second electrical joint 31 approach and equal, thereby improving the current collection efficiency.

[0089] It should be explained that when the distance T between the first straight line 22 and the second straight line 32 in each group of electrical junctions 20 is less than 0.8 mm, since the two interconnects need to be welded to the first electrical junction 21 and the second electrical junction 31 respectively in subsequent processes, and the interconnects themselves have a certain width, it is easy for two adjacent interconnects with opposite polarities to short-circuit, and the requirements for processing technology are also high. When the distance T between the first straight line 22 and the second straight line 32 in each group of electrical junctions 20 is greater than 4 mm, the photogenerated carriers on the first fine gate 2 or the second fine gate 3 need to travel a longer path to reach the first electrical junction 21 or the second electrical junction 31, and there may be local current density that is too high. The current collection paths on the left and right sides of the first electrical junction 21 and the second electrical junction 31 in the same group of electrical junctions 20 are too different, and the collection uniformity is poor.

[0090] In specific applications, the distance T between the first straight line 22 and the second straight line 32 in each electrical connection 20 can be set to any value or a range between any two values, such as 0.8mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm.

[0091] In actual measurements, for example, such as Figure 1 and Figure 2 As shown, the distance between the geometric center of a first electrical connection 21 along the second direction Y and the geometric center of a second electrical connection 31 along the second direction Y in the same group of electrical connections 20 can be measured, which is the distance T between the first straight line 22 and the second straight line 32 in the same group of electrical connections 20. Of course, it can also be the distance between two edge lines.

[0092] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, the width W of the battery body 1 along the second direction Y satisfies: 160mm≤W≤260mm.

[0093] In this embodiment of the application, by setting the width W of the battery body 1 along the second direction Y within a reasonable range, it is possible to ensure the structural strength of the battery body 1 while ensuring sufficient light-receiving area and reducing the possibility of damage.

[0094] It should be explained that when the width W of the battery body 1 along the second direction Y is less than 160mm, the light-receiving area of ​​the battery body 1 is too small, and the efficiency of generating current is too low; while when the width W of the battery body 1 along the second direction Y is greater than 260mm, the overall area of ​​the battery body 1 is too large. Since the battery body 1 has a plate-like structure, the structural strength of the battery body 1 is poor and it is easy to be damaged.

[0095] In specific applications, the width W of the battery body 1 along the second direction Y can be set to any value or a range between two arbitrary values, such as 160mm, 170mm, 180mm, 190mm, 200mm, 210mm, 220mm, 230mm, 240mm, 250mm, 260mm.

[0096] In some embodiments of this application, such as Figures 1 to 4 As shown, along the first direction X, a plurality of first fine grids 2 and a plurality of second fine grids 3 are arranged at equal intervals.

[0097] In the embodiments of this application, the equal spacing of multiple first fine grids 2 and multiple second fine grids 3 can reduce excessive local current density and reduce the possibility of hot spot effect, thereby improving the reliability and lifespan of solar cells.

[0098] It should be explained that the multiple first fine grids 2 are set at equal intervals, that is, the distance between any two adjacent first fine grids 2 is the same value, and the distance between adjacent first fine grids 2 and second fine grids 3 along the first direction X is also equal.

[0099] In some embodiments of this application, such as Figure 2 As shown, the solar cell also includes a first conductive element 4 and a second conductive element 5. The first conductive element 4 is electrically connected to a plurality of first electrical connections 21 in the same group of electrical connections 20, and the second conductive element 5 is electrically connected to a plurality of second electrical connections 31 in the same group of electrical connections 20.

[0100] In this embodiment, the first conductive member 4 can electrically connect multiple first electrical connections 21 in the same group of electrical connections 20 to collect and output the current in multiple first fine grids 2; the second conductive member 5 can electrically connect multiple second electrical connections 31 in the same group of electrical connections 20 to collect and output the current in multiple second fine grids 3; thereby shortening the current transmission distance and reducing power loss; at the same time, it can facilitate connection with interconnecting components; and it can disperse the stress during welding or packaging, reducing the risk of microcracks in the battery body 1.

[0101] It should be noted that the first conductive element 4 may be a main gate that runs through the first direction X, which has a simpler structure and is easier to process; or a multi-busbar (MBB) structure, which can shorten the current transmission path and improve current uniformity; or at least one of the main gate structures such as a floating main gate. Those skilled in the art can make the configuration according to actual needs, and this application does not limit it.

[0102] In specific applications, the width of the first conductive element 4 and the second conductive element 5 along the second direction Y is 30μm to 50μm, thereby reducing the obstruction of sunlight and improving the current generation efficiency.

[0103] In some embodiments of this application, the solar cell may also be a gridless structure (OBB, Zero Busbar), where interconnects are electrically connected to the fine grid via electrical junctions 20, thereby discharging current.

[0104] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, along the first direction X, the width of the first electrical connection portion 21 is greater than the width of the portion of the first fine gate 2 excluding the first electrical connection portion 21.

[0105] In this embodiment, the width of the first electrical connection portion 21 is greater than the width of the portion of the first fine gate 2 excluding the first electrical connection portion 21, thereby facilitating welding with the interconnect and subsequent processing.

[0106] In specific applications, the first electrical connection portion 21 can be integrally formed with the first fine grid 2. During processing, the first electrical connection portion 21 is widened to form the first electrical connection portion 21. For example, the first fine grid 2 is formed by silver paste printing. A larger electrical connection point is formed by silver paste at the location of the first electrical connection portion 21, and this electrical connection point is the first electrical connection portion 21. The width of this area along the first direction X is greater than the width of the rest of the first fine grid 2. This can improve processing efficiency, for example, by eliminating the need for additional coating of conductive adhesive to form the electrical connection point.

[0107] In some embodiments of this application, such as Figure 1 and Figure 2 As shown, along the first direction X, the width of the second electrical connection portion 31 is greater than the width of the portion of the second fine gate 3 excluding the second electrical connection portion 31.

[0108] In this embodiment, the width of the second electrical connection portion 31 is greater than the width of the portion of the second fine gate 3 excluding the second electrical connection portion 31, thereby facilitating welding with the interconnecting component and subsequent processing.

[0109] In specific applications, the second electrical connection portion 31 can be integrally formed with the second fine grid 3. During processing, the second electrical connection portion 31 is widened to form the second electrical connection portion 31. For example, the second fine grid 3 is formed by silver paste printing, and a larger electrical connection point is formed at the location of the second electrical connection portion 31 by the silver paste. This electrical connection point is the second electrical connection portion 31, and the width of this area along the first direction X is greater than the width of the rest of the second fine grid 3. This can improve processing efficiency, for example, by eliminating the need for additional coating of conductive adhesive to form the electrical connection point.

[0110] In some embodiments of this application, such as Figure 2 , Figure 3 and Figure 4As shown, the solar cell also includes a first insulating element 6, which is disposed between the first fine grid 2 and the second conductive element 5.

[0111] In this embodiment, by providing a first insulating member 6 between the first fine gate 2 and the second conductive member 5, an insulating isolation can be formed between the first fine gate 2 and the second conductive member 5, reducing the risk of short circuit between the first fine gate 2 and the second conductive member 5.

[0112] In specific applications, the first insulating element 6 can be an insulating coating, rubber pad, etc., as long as it can achieve insulation isolation between the first fine grid 2 and the second conductive element 5. Those skilled in the art can make the settings according to actual needs, and this application does not limit it.

[0113] In some embodiments of this application, such as Figure 2 , Figure 3 and Figure 4 As shown, the solar cell also includes a second insulating element 7, which is disposed between the second fine grid 3 and the first conductive element 4.

[0114] In this embodiment, by providing a second insulating member 7 between the second fine gate 3 and the first conductive member 4, an insulating isolation can be formed between the second fine gate 3 and the first conductive member 4, reducing the risk of short circuit between the second fine gate 3 and the first conductive member 4.

[0115] In specific applications, the second insulating element 7 can be an insulating coating, a rubber pad, etc., as long as it can achieve insulation isolation between the second fine grid 3 and the first conductive element 4. Those skilled in the art can make the setting according to actual needs, and this application does not limit it.

[0116] In some embodiments of this application, such as Figure 3 and Figure 4 As shown, a photovoltaic module is also proposed, including interconnects and solar cells as described in any of the above embodiments, wherein the interconnects are electrically connected to the electrical junction 20.

[0117] In this embodiment, the interconnecting element is used to connect multiple solar cells, connect the electrical junctions 20 of adjacent solar cells in series / parallel, and conduct current. In the solar cell, by setting the ratio D / W between the vertical distance D between the first center line 12 of the first group of electrical junctions 201 and the edge of the adjacent cell body 1 and the width W of the cell body 1 along the first direction X, the first electrical junction 21 or the second electrical junction 31 is at a certain distance from the edge of the cell body 1, thereby avoiding the first electrical junction 21 or the second electrical junction 31 being too close to the edge of the cell body 1. While satisfying the current collection in the first fine grid 2 or the second fine grid 3, the risk of microcracks during welding in subsequent processes is reduced.

[0118] In specific applications, interconnecting components may include at least one of the following: solder ribbons, such as conventional solder ribbons, multi-busbar solder ribbons, low-temperature solder ribbons, etc.; conductive adhesives, such as silver paste, copper paste, anisotropic conductive adhesives, etc.; flexible circuits, such as lightweight components, interconnecting heterogeneous components; and conductive backplanes, with the backplane integrating a conductive layer directly connected to solar cells, etc. Those skilled in the art can configure these components according to actual needs, and this application does not impose any limitations on them.

[0119] In some embodiments of this application, such as Figure 3 and Figure 4 As shown, the interconnecting element includes a first interconnecting element 8 and a second interconnecting element 9. The first interconnecting element 8 is disposed along a first direction X and is electrically connected to a plurality of first electrical connections 21 or first conductive elements 4 in a set of electrical connections 20. The second interconnecting element 9 is disposed along the first direction X and is electrically connected to a plurality of second electrical connections 31 or second conductive elements 5 in a set of electrical connections 20.

[0120] In this embodiment, the first interconnecting element 8 and the second interconnecting element 9 can lead out currents of different polarities to form a current loop, thereby realizing the output of photogenerated current for user use.

[0121] It should be noted that the first interconnecting element 8 can be electrically connected to the first electrical connection portion 21, for example, the first interconnecting element 8 can be directly spot-welded to the pad; or the first interconnecting element 8 can be electrically connected to the first conductive element 4, for example, the first interconnecting element 8 can be directly connected to the first main gate. The connection method of the second interconnecting element 9 is the same as that of the first interconnecting element 8, and will not be described again here.

[0122] In some embodiments of this application, the distance between the center line of the first interconnecting member 8 along the second direction Y and the center line of the second interconnecting member 9 along the second direction Y is equal to the distance T between the first straight line 22 and the second straight line 32.

[0123] In this embodiment, the distance between the center line of the first interconnecting member 8 along the second direction Y and the center line of the second interconnecting member 9 along the second direction Y is equal to the distance T between the first straight line 22 and the second straight line 32. That is, the first interconnecting member 8 and a set of first electrical connection portions 21 overlap, and the second interconnecting member 9 and a set of second electrical connection portions 31 overlap, which can reduce the current transmission path and improve the structural strength.

[0124] In a specific application, the center line of the first interconnecting member 8 along the second direction Y coincides with the first straight line 22. At this time, the first straight line 22 is the center line of a group of first electrical connections 21 along the second direction Y; the center line of the second interconnecting member 9 along the second direction Y coincides with the second straight line 32. At this time, the second straight line 32 is the center line of a group of second electrical connections 31 along the second direction Y.

[0125] In some embodiments of this application, in photovoltaic modules, along different cell string arrangement directions, adjacent solar cells may be electrically connected to corresponding busbars via an electrical junction located on the outermost side and an interconnecting member. In this case, two sets of electrical junctions 20 are provided between the interconnecting members connecting the two adjacent solar cells.

[0126] Alternatively, along different battery string arrangement directions, one of two adjacent solar cells can be electrically connected to the corresponding busbar via an interconnecting element through an outermost electrical connection, while the other is electrically connected to the corresponding busbar via an interconnecting element through an outermost electrical connection. In this case, a set of electrical connections 20 is provided between the interconnecting elements of the two adjacent solar cells.

[0127] Alternatively, along different battery string arrangement directions, adjacent solar cells can be electrically connected to their respective busbars via an interconnecting element at their outermost electrical junction. In this case, there are 0 sets of electrical junctions 20 between the interconnecting elements of the two adjacent solar cells.

[0128] The arrangement of interconnect components can be selected based on space requirements and stress distribution needs. The following are for reference: If a larger space is needed, such as to avoid junction boxes, or if the edges of solar cells are prone to stress damage, the first or second option can be used; conversely, the third option can be chosen for areas where dense stress is required, such as the edges of photovoltaic modules.

[0129] In this embodiment, the first electrical connection portion 21 or the second electrical connection portion 31 of the solar cell is a certain distance from the edge of the battery body 1, thereby avoiding the first electrical connection portion 21 or the second electrical connection portion 31 being too close to the edge of the battery body 1. This also avoids the interconnecting parts that are electrically connected to the electrical connection portions 20 of two adjacent solar cells being too close. Even if one or zero sets of electrical connection portions 20 are provided between the two adjacent interconnecting parts of the two adjacent solar cells in the second or third case, enough space can be provided to meet the requirements of the busbar opening or junction box setting. At the same time, the force-bearing structure setting is increased, making the component structure more stable. In particular, in the third case, the waste of electrical connection portions 20 is avoided, and the carrier collection effect is enhanced.

[0130] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0131] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A solar cell, characterized in that, include: The battery body has a plurality of first fine grids and a plurality of second fine grids extending along a second direction and alternately spaced along a first direction on its surface, wherein the first direction intersects the second direction; The surface of the battery body is provided with a plurality of electrical bonding portions, the electrical bonding portions including a first electrical bonding portion electrically connected to at least one of the first fine grids and a second electrical bonding portion electrically connected to at least one of the second fine grids; The electrical connection portion is in multiple groups, and each group of electrical connection portions includes a group of multiple first electrical connection portions collinear along the first direction and a group of multiple second electrical connection portions collinear along the first direction. Each set of electrical connections has a first centerline along the second direction. The plurality of sets of electrical connections include a first set of electrical connections disposed near the edge of the battery body. The vertical distance between the first centerline of the first set of electrical connections and the adjacent edge of the battery body is D. The width of the battery body along the second direction is W, satisfying: 0.03≤D / W≤0.

09.

2. The solar cell according to claim 1, characterized in that, The distance between the first centerline of two adjacent electrical junctions is S, which satisfies: 0.8≤S / D≤2.

3. The solar cell according to claim 1, characterized in that, Along the first direction, in each group of electrical joints, one group of the first electrical joints is collinear with a first straight line, and one group of the second electrical joints is collinear with a second straight line; along the second direction, the distance between the first straight line and the second straight line in each group of electrical joints is T, satisfying: 2≤D / T≤14.

4. The solar cell according to claim 1, characterized in that, The distance between the first centerlines of two adjacent electrical joints is S; along the first direction, in each group of electrical joints, one group of the first electrical joints is collinear with a first straight line, and one group of the second electrical joints is collinear with a second straight line; along the second direction, the distance between the first straight line and the second straight line in each group of electrical joints is T, and the ratio of D:T:S ranges from 2:1:1.6 to 14:1:

28.

5. The solar cell according to claim 1, characterized in that, The solar cell further includes an edge connection electrode, which is electrically connected to the first or second grid located near the edge of the cell body along the first direction.

6. The solar cell according to claim 1, characterized in that, The first fine grid is disconnected at a position corresponding to the second electrical junction to form a plurality of first sub-fine grids, each of which is provided with a first electrical junction; the first sub-fine grid includes a first end and a second end opposite to each other along the second direction, and the distance from the first end to the corresponding first electrical junction is not equal to the distance from the second end to the corresponding first electrical junction; And / or, the second fine gate is disconnected at a position corresponding to the first electrical junction to form a plurality of second sub-fine gates, the second sub-fine gate including a third end and a fourth end opposite to each other along the second direction, the distance from the third end to the corresponding second electrical junction is not equal to the distance from the fourth end to the corresponding second electrical junction.

7. The solar cell according to claim 4, characterized in that, The solar cell must meet at least one of the following conditions: A. The vertical distance D between the first centerline of the first group of electrical junctions and the adjacent edge of the battery body satisfies: 7mm <D<15mm; B. The distance T between the first straight line and the second straight line in each electrical junction satisfies: 0.8mm≤T≤4mm; C. The width W of the battery body along the second direction satisfies: 160mm≤W≤260mm.

8. The solar cell according to claim 1, characterized in that, Along the first direction, a plurality of first fine grids and a plurality of second fine grids are arranged at equal intervals.

9. The solar cell according to any one of claims 1-8, characterized in that, The solar cell further includes a first conductive element and a second conductive element, wherein the first conductive element is electrically connected to a plurality of first electrical junctions in the same group of electrical junctions, and the second conductive element is electrically connected to a plurality of second electrical junctions in the same group of electrical junctions.

10. The solar cell according to any one of claims 1-8, characterized in that, Along the first direction, the width of the first electrical junction is greater than the width of the portion of the first fine gate excluding the first electrical junction; And / or, along the first direction, the width of the second electrical connection portion is greater than the width of the portion of the second fine gate excluding the second electrical connection portion.

11. The solar cell according to claim 9, characterized in that, The solar cell further includes a first insulating element, which is disposed between the first fine grid and the second conductive element; And / or, the solar cell further includes a second insulating element disposed between the second fine grid and the first conductive element.

12. A photovoltaic module, characterized in that, It includes interconnects and battery strings; the battery strings are formed by electrical connections of solar cells as described in any one of claims 1-11, and the interconnects are electrically connected to the electrical junction.

13. The photovoltaic module according to claim 12, characterized in that, Along different battery string arrangement directions, two adjacent electrical connections are provided between the interconnecting elements of two adjacent solar cells, with 0, 1, or 2 sets of electrical junctions.

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