Solar cell piece, cell assembly and photovoltaic system

Abstract

The utility model discloses a solar cell sheet, a cell assembly and a photovoltaic system, and relates to the technical field of solar cells, the solar cell sheet comprises a cell sheet body, two opposite side surfaces of the cell sheet body are a front surface and a back surface, the front surface and the back surface of the cell sheet body are both provided with first grid lines, and the first grid lines are provided with second grid lines. A first distribution area and a third distribution area are arranged on the front face of the cell body, a second distribution area and a fourth distribution area are arranged on the back face of the cell body, the first distribution area and the second distribution area are arranged on the two sides of the cell body in the first direction respectively, and the bonding pads are arranged in the first distribution area and the second distribution area. In the third distribution area and the fourth distribution area, the first grid lines are not provided with bonding pads. According to the solar cell piece, the bonding pads are only arranged in the first distribution area and the second distribution area, so that the number of the bonding pads is greatly reduced, the production material of the solar cell piece is saved, and the production cost of the solar cell piece and the solar cell module is reduced.

Description

Technical Field

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

[0002] Solar cell modules are generally assembled by connecting multiple solar cells in sequence, and two adjacent solar cells are electrically connected through welding strips. At present, existing solar cells are provided with multiple welding pads on both sides and in the middle of each side of the cell, so that a large number of welding pads are arranged on each side of the solar cell, and the welding strips are welded to two adjacent solar cells through the welding pads to make the two adjacent solar cells conductive.

[0003] However, the existing solder pad arrangement method of solar cells requires a large amount of solder pad materials, which not only increases the production cost of solar cells, but also arranges a large number of solder pads on each side of the solar cell, which also affects the grid line arrangement of the solar cell, increases the influencing factors affecting the production quality of the solar cell, and restricts the performance improvement of the solar cell. Utility Model Content

[0004] The utility model aims to provide a solar cell, a battery assembly and a photovoltaic system to solve the problem that too many welding points are arranged on the existing solar cell, resulting in waste of materials and affecting the arrangement of grid lines.

[0005] In order to achieve the above purpose, the utility model adopts the following design:

[0006] A solar cell comprises a cell body and a solder pad, wherein:

[0007] Two oppositely disposed side surfaces of the battery cell body are set as a front side and a back side, and the front side and the back side of the battery cell body are both provided with first grid lines arranged along a first direction, and the front side of the battery cell body is divided into a first distribution area and a third distribution area along the first direction, and the back side of the battery cell body is divided into a second distribution area and a fourth distribution area along the first direction, and the first distribution area and the second distribution area are respectively arranged on opposite sides of the battery cell body in the first direction;

[0008] The pad is disposed on the first gate line in the first distribution area and the first gate line in the second distribution area, and the pad is not disposed on the first gate line in the third distribution area outside the first distribution area and the fourth distribution area outside the second distribution area.

[0009] In some embodiments, the welding pad includes a first welding pad arranged on the first grid line on the front side of the battery cell body and a second welding pad arranged on the first grid line on the back side of the battery cell body, and the first welding pad and the second welding pad are respectively arranged at the edges of the corresponding first grid line; and within a single first grid line, the number of the first welding pad and / or the second welding pad is N, and the N first welding pads and / or the N second welding pads are respectively arranged at intervals on the corresponding first grid line, and 1≤N≤4.

[0010] In some embodiments, the solar cell is a busbar cell. In the same cell body, the first busbar is a positive busbar disposed on the front side of the cell body and a negative busbar disposed on the back side of the cell body. Each positive busbar and each negative busbar are arranged along a first direction, which is the direction of the short side of the cell body.

[0011] In some embodiments, there are multiple positive main grids, which are arranged in sequence along the second direction, and the first direction intersects with the second direction; there are multiple negative main grids, which are arranged in sequence along the second direction, and the first direction intersects with the second direction.

[0012] In some embodiments, the solar cell is a main grid cell. In the same cell body, a positive electrode fine grid is also provided on the front side of the cell body, and a negative electrode fine grid is also provided on the back side of the cell body. Each of the positive electrode fine grid and each of the negative electrode fine grid are arranged along the second direction.

[0013] In some embodiments, there are multiple positive electrode fine grids, and the multiple positive electrode fine grids are arranged in sequence along the first direction; there are multiple negative electrode fine grids, and the multiple negative electrode fine grids are arranged in sequence along the first direction.

[0014] In some embodiments, the solar cell is a main grid-less cell. In the same cell body, the first grid line is a front fine grid arranged on the front side of the cell body and a back fine grid arranged on the back side of the cell body. Each front fine grid and each back fine grid are arranged along the first direction.

[0015] In some embodiments, there are multiple pads, and the multiple pads are arranged sequentially along the second direction.

[0016] Based on the aforementioned solar cell sheets, the utility model provides a solar cell assembly, comprising a plurality of the aforementioned solar cell sheets and welding strips, wherein:

[0017] The welding ribbon is connected to any solar cell, connected to the welding pad in the first distribution area or the second distribution area of ​​any solar cell, and extends to the adjacent solar cell along the first direction, connected to the corresponding welding pad in the second distribution area or the first distribution area of ​​the adjacent solar cell, and the welding ribbon covers any solar cell and the first grid line on the adjacent solar cell.

[0018] In some embodiments, a plurality of solar cells are arranged in the same direction along a first direction; along the first direction, the welding strip covers the first grid lines on any solar cell and the adjacent solar cell.

[0019] Based on the aforementioned solar cell assembly, the utility model further provides a photovoltaic system, which includes the aforementioned solar cell assembly.

[0020] Compared with the prior art, the solar cell, photovoltaic module and photovoltaic system implemented by the utility model have the following beneficial effects:

[0021] The solar cell is divided into a first distribution area and a third distribution area on the front side of the cell body, and a second distribution area and a fourth distribution area on the back side of the cell body, and the first distribution area and the second distribution area are respectively arranged on opposite sides of the cell body in the first direction, so that welding pads are only arranged in the first distribution area and the second distribution area on the two sides of the cell body, and no welding pads are arranged on the first grid line in the third distribution area outside the first distribution area and the fourth distribution area outside the second distribution area, thereby forming a layout structure in which welding pads are arranged only in the designated area on the two sides of the cell body, which greatly reduces the number of welding points on the solar cell, saves the production materials of the solar cell, and reduces the production cost of the solar cell and the solar cell module. Moreover, the first distribution area and the second distribution area are respectively arranged on opposite sides of the cell body in the first direction, and the welding pads are not arranged in the area outside the first distribution area and the second distribution area, so that no welding pads are arranged on the first grid line outside the first distribution area and the second distribution area, and the first grid line is welded to the welding pads of the two distribution areas of the adjacent solar cell through the welding ribbon, which can ensure the conductive connection of each solar cell in the solar cell module, so that each solar cell can be connected in series or in parallel according to the design requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view schematic diagram of the solar cell in Example 1 of the utility model;

[0023] Figure 2 It is a schematic diagram of the reverse side of the solar cell in Embodiment 1 of the present utility model;

[0024] Figure 3 It is a front view schematic diagram of a solar cell in Embodiment 2 of the present utility model;

[0025] Figure 4 It is a schematic diagram of the reverse side of the solar cell in Embodiment 2 of the present utility model;

[0026] Figure 5 It is a front view schematic diagram of a solar cell in Embodiment 3 of the present utility model;

[0027] Figure 6 It is a schematic diagram of the reverse side of the solar cell in Embodiment 3 of the present utility model;

[0028] Figure 7 It is a front view schematic diagram of a solar cell assembly in Example 4 of the utility model;

[0029] Figure 8 It is a schematic diagram of the reverse side of the solar cell assembly in Example 4 of the utility model;

[0030] Fig. 9 It is a front view schematic diagram of a solar cell assembly in Example 5 of the utility model;

[0031] Fig.10 It is a schematic diagram of the reverse side of the solar cell assembly in Example 5 of the utility model.

[0032] In the figure, 1A, solar cell; 2A, first grid line;

[0033] 1. Battery cell body; 10. Front side; 100. First distribution area; 101. Third distribution area; 11. Back side; 110. Second distribution area; 111. Fourth distribution area; 2. First welding pad; 3. Second welding pad; 4. Positive electrode fine grid; 5. Negative electrode fine grid; 6. Welding strip. DETAILED DESCRIPTION

[0034] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0035] In the description of the present utility model, it should be understood that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. The terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0036] In the description of the present invention, it should be understood that the terms "height", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0037] In the description of the present invention, it should be understood that the terms "first" and "second" are used in the present invention for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0038] Example 1

[0039] like Figure 1-2 As shown, the solar cell 1A of this embodiment 1 is a busbar cell, that is, a busbar is provided on the solar cell. It should be noted that, according to the design requirements of the busbar cell, the number of busbars provided on the cell can be 1 or more. This embodiment 1 specifically takes a 7BB (7 busbar) cell as an example for further detailed description.

[0040] The solar cell 1A of the present embodiment 1 comprises a cell body 1, and two opposite side surfaces are formed on the cell body 1, namely, a front surface 10 and a back surface 11. The front surface 10 and the back surface 11 of the cell body 1 are both provided with first grid lines 2A arranged along a first direction, and along the first direction, the front surface 10 of the cell body 1 is divided into a first distribution area 100 and a third distribution area 101, and the back surface 11 of the cell body 1 is divided into a second distribution area 110 and a fourth distribution area 111, that is, the front surface 10 of the cell body 1, except for the first distribution area 100, has the third distribution area 101, and the back surface 11 of the cell body 1, except for the second distribution area 110, has the fourth distribution area 111, and the first distribution area 100 and the second distribution area 110 are respectively arranged on opposite sides of the cell body 1 in the first direction. Generally speaking, on the front side 10 of the cell body 1 , the area of ​​the third distribution area 101 is larger than that of the first distribution area 100 , and on the back side 11 of the cell body 1 , the area of ​​the fourth distribution area 111 is larger than that of the second distribution area 110 .

[0041] It should be noted that in this embodiment 1, the first direction is the direction of the short side of the battery cell body 1. Specifically, Figure 1-2 As shown, the first distribution area 100 is arranged on the left side of the front side 10 of the battery cell body 1, the third distribution area 101 is arranged on the right side of the front side 10 of the battery cell body 1, the second distribution area 110 is arranged on the right side of the back side 11 of the battery cell body 1, and the fourth distribution area 111 is arranged on the left side of the back side 11 of the battery cell body 1. In other embodiments, the first distribution area 100 may also be arranged on the right side of the front side 10 of the battery cell body 1, and the third distribution area 101 is arranged on the left side of the front side 10 of the battery cell body 1, and correspondingly, the second distribution area 110 is arranged on the left side of the back side 11 of the battery cell body 1, and the fourth distribution area 111 is arranged on the right side of the back side 11 of the battery cell body 1.

[0042] In the present embodiment 1, the first grid line 2A of the front side 10 of the cell body 1 is provided with a first pad 2, and the first grid line 2A of the back side 11 of the cell body 1 is provided with a second pad 3, and the first pad 2 and the second pad 3 are pads of the solar cell 1A in the present embodiment 1. The first pad 2 is provided in the first distribution area 100 of the front side 10 of the cell body 1, and the second pad 3 is provided in the second distribution area 110 of the back side 11 of the cell body 1, so that the first pad 2 and the second pad 3 are respectively provided on opposite sides of the cell body 1 in the first direction.

[0043] Specifically, Figure 1-2As shown, the first welding pad 2 is arranged on the left side of the battery cell body 1, and the second welding pad 3 is arranged on the right side of the battery cell body 1. Therefore, in the third distribution area 101 outside the first distribution area 100 and in the fourth distribution area 111 outside the second distribution area 110, the first grid line 2A is not provided with a welding pad, that is, in the front side 10 and the back side 11 of the battery cell body 1, no welding pad is arranged on the first grid line 2A outside the first distribution area 100 and the second distribution area 110, and the welding pads are only arranged in the first distribution area 100 and the second distribution area 110 of the battery cell body 1.

[0044] By only setting the first solder pad 2 in the first distribution area 100 of the cell body 1, and only setting the second solder pad 3 in the second distribution area 110 of the cell body 1, the cell body 1 has and only has solder pads arranged on one side on the front side 10 and the back side 11, which greatly reduces the number of solder joints on the solar cell 1A, saves the production materials of the solar cell 1A, and reduces the production cost of the solar cell 1A and the solar cell module.

[0045] It should be noted that the area where the first pad 2 is set corresponds to the location of the first distribution area 100, and the area where the second pad 3 is set corresponds to the location of the second distribution area 110. In other embodiments, when the first distribution area 100 is set on the right side of the front side 10 of the battery cell body 1 and the second distribution area 110 is set on the left side of the back side 11 of the battery cell body 1, the first pad 2 is correspondingly set on the right side of the front side 10 of the battery cell body 1, and the second pad 3 is set on the left side of the back side 11 of the battery cell body 1.

[0046] In the present embodiment 1, on the front side 10 of the cell body 1, when the first grid line 2A is arranged along the first direction, the first pad 2 corresponds to the arrangement position of the first grid line 2A and is arranged on the path of the first grid line 2A, so that when the welding strip is welded to the first pad 2, it can cover the first grid line 2A in the first direction. Correspondingly, on the back side 11 of the cell body 1, the second pad 3 also corresponds to the arrangement position of the first grid line 2A and is arranged on the path of the first grid line 2A. In this way, the two ends of the welding strip are welded to the first pad 2 of the cell body 1 and the second pad 3 of the adjacent cell body 1, and the adjacent cell bodies 1 can be electrically connected.

[0047] like Figure 1-2 As shown, there are multiple first pads 2, which are arranged in sequence along the second direction; there are multiple second pads 3, which are arranged in sequence along the second direction, and the first pads 2 and the second pads 3 are respectively arranged at the edges of the first grid lines 2A arrangement direction of the front side 10 and the back side 11 of the battery cell body 1. Of course, there are also multiple welding strips 6.

[0048] In the present embodiment 1, the first pad 2 is arranged at the edge of the first grid line 2A arrangement direction of the side, that is, on the front side 10 of the battery cell body 1, the first pad 2 is arranged at the left end of the first grid line 2A. Correspondingly, the second pad 3 is arranged at the edge of the first grid line 2A arrangement direction of the side, that is, on the reverse side 11 of the battery cell body 1, the second pad 3 is arranged at the right end of the first grid line 2A. In other embodiments, if the first pad 2 is arranged on the right side of the battery cell body 1, at this time, the first pad 2 is arranged at the edge of the first grid line 2A arrangement direction of the side, that is, on the front side 10 of the battery cell body 1, the first pad 2 is arranged at the right end of the first grid line 2A, and correspondingly, on the reverse side 11 of the battery cell body 1, the second pad 3 is arranged at the left end of the first grid line 2A.

[0049] like Figure 1-2 As shown, in this embodiment 1, the solar cell 1A has a main grid and a fine grid. Specifically, in the same cell body 1, the front side 10 of the cell body 1 is provided with a positive main grid and a positive fine grid 4, wherein:

[0050] The first grid line 2A located on the front side 10 of the battery cell body 1 is used as a positive main grid. There are multiple positive main grids, each of which is arranged along a first direction. Multiple positive main grids are arranged along a second direction, and the first direction intersects the second direction.

[0051] There are multiple positive electrode fine grids 4 , each positive electrode fine grid 4 is arranged along the second direction, and multiple positive electrode fine grids 4 are arranged along the first direction.

[0052] Moreover, in the same cell body 1, the reverse side 11 of the cell body 1 is provided with a negative electrode main grid and a negative electrode fine grid 5, wherein:

[0053] The first grid line 2A located on the reverse side 11 of the battery cell body 1 is used as a negative main grid. There are multiple negative main grids, each of which is arranged along a first direction. Multiple negative main grids are arranged along a second direction, and the first direction intersects the second direction.

[0054] There are multiple negative electrode fine grids 5 , each negative electrode fine grid 5 is arranged along the second direction, and multiple negative electrode fine grids 5 are arranged along the first direction.

[0055] It should be noted that in this embodiment 1, the second direction is the arrangement direction of the fine grid. Generally speaking, in the solar cell 1A, the arrangement directions of the main grid and the fine grid are perpendicular to each other. Therefore, in this embodiment 1, the second direction is Figure 1 In the direction of the long side of the battery cell body 1 shown, the first pad 2 and the second pad 3 are arranged on the front side 10 and the back side 11 of the battery cell body 1 from top to bottom.

[0056] It should be noted that the positive main grid and the negative main grid are made of conductive materials, and are arranged in a linear manner on the battery cell body 1 in a continuous arrangement. In other embodiments, the positive main grid and the negative main grid can also be arranged on the battery cell body 1 in a non-continuous arrangement manner in the shape of dots, blocks, etc. In this case, the positive main grid and the negative main grid arranged along the first direction will include multiple conductors, and the conductors in the same row can be connected through the welding strip 6, so that the positive main grid and the negative main grid are connected in the first direction.

[0057] Example 2

[0058] The difference between this embodiment 2 and embodiment 1 is that Figure 3-4 As shown, in the solar cell 1A of the present embodiment 2, on a single first grid line 2A, the number of the first soldering pads 2 and the second soldering pads 3 is 4, the 4 first soldering pads 2 and the 4 second soldering pads 3 are respectively arranged at intervals on the corresponding grid lines, and the 4 first soldering pads 2 are still distributed in the first distribution area 100 of the front side 10 of the cell body 1, and the 4 second soldering pads 3 are distributed in the second distribution area 110 of the back side 11 of the cell body 1.

[0059] In other embodiments, the number of the first pads 2 and the second pads 3 on a single first grid line 2A may also be 2 or 3. The number of the first pads 2 and the second pads 3 on a single first grid line 2A may be determined according to the specification design of the solar cell 1A.

[0060] Example 3

[0061] The difference between this embodiment 3 and embodiment 1 is that Figure 5-6 As shown, the solar cell 1A in the third embodiment is a busbar-less solar cell, that is, the solar cell 1A does not have a busbar, so in the third embodiment, the first grid line 2A is a fine grid.

[0062] In this embodiment 3, on the front side 10 of the battery cell body 1, the first grid line 2A serves as a fine grid, passing through the first distribution area 100 and the third distribution area 101 along the first direction, and the first solder pad 2 is arranged on the first grid line 2A on the front side 10 of the battery cell body 1 and distributed in the first distribution area 100.

[0063] On the reverse side 11 of the cell body 1 , the first grid line 2A serves as a fine grid and passes through the second distribution area 110 and the fourth distribution area 111 along the first direction. The second pad 3 is arranged on the first grid line 2A on the reverse side 11 of the cell body 1 and is distributed in the second distribution area 110 .

[0064] At this time, when the welding ribbon is welded to the first welding pad 2, it can cover the first grid line 2A located on the front side 10 of the battery cell body 1 in the first direction. Correspondingly, when the welding ribbon is welded to the second welding pad 3 on the back side 11 of the battery cell body 1, it can also cover the first grid line 2A located on the back side 11 of the battery cell body 1 in the first direction. In this way, the two ends of the welding ribbon are welded to the first welding pad 2 of the battery cell body 1 and the second welding pad 3 of the adjacent battery cell body 1, and the adjacent battery cell bodies 1 can be electrically connected.

[0065] Example 4

[0066] like Figure 7-8 As shown, a solar cell assembly of the fourth embodiment includes a plurality of solar cells 1A and welding strips 6 of the first embodiment, wherein the plurality of solar cells 1A are sequentially arranged in the same direction along a first direction.

[0067] It should be noted that the solar cell sheets 1A may also be arranged in other arrangements according to design requirements. Moreover, according to the performance requirements of the solar cell assembly, the number of solar cell sheets 1A may be 2 or more.

[0068] In this embodiment 4, the welding ribbon 6 is connected to any solar cell 1A along the first direction, welded to the first welding pad 2 in the first distribution area 100 of the solar cell 1A, and sequentially extends through the third distribution area 101 and the fourth distribution area 111 of the adjacent solar cell 1A to the second distribution area 110 of the adjacent solar cell 1A, and welded to the second welding pad 3 of the second distribution area 110, and the welding ribbon 6 covers the first grid line 2A on the any solar cell 1A and the adjacent solar cell 1A.

[0069] In this embodiment 4, Figure 7-8 As shown, in any solar cell 1A, the soldering ribbon 6 connected to the first soldering pad 2 will extend along the first direction toward the right side of the solar cell 1A, and extend forward to the second soldering pad 3 of another solar cell 1A, thereby covering the first grid line 2A located on the front side 10 of the solar cell 1A and the first grid line 2A on the back side 11 of the other solar cell 1A, so that the soldering ribbon 6 covers the first grid line 2A on the front side 10 where the connected first soldering pad 2 is located and the first grid line 2A on the back side 11 where the connected second soldering pad 3 is located, thereby realizing the power output of a single solar cell 1A and the conductive connection between two adjacent solar cells 1A.

[0070] At this time, the length of the welding ribbon 6 in the solar cell assembly is the distance between the first welding pad 2 and the second welding pad 3 on two adjacent solar cells 1A, and the length of the welding ribbon 6 is close to the sum of the width of the two solar cells 1A and the spacing between the two adjacent solar cells 1A, and each solar cell 1A has only one row of welding pads on the front and back sides, respectively. In this way, the number of welding pads and the material used will be less than that of multiple rows of welding pads.

[0071] It should be noted that the solar cell 1A constituting the solar cell assembly can be Figure 5 The same-direction arrangement shown can also be arranged in a staggered manner according to the requirements of the assembly design. In this case, the portion of the welding ribbon 6 on any solar cell 1A is still arranged along the first direction, covering the first grid line 2A located between the connected first welding pad 2 and the second welding pad 3 in the first direction, while the portion of the welding ribbon 6 between two adjacent solar cells 1A is arranged according to the relative position between the two adjacent solar cells 1A.

[0072] Based on the solar cell assembly of the fourth embodiment, the fourth embodiment further provides a photovoltaic system, which includes the aforementioned solar cell assembly.

[0073] Example 5

[0074] like Figure 9-10 As shown, the difference between this embodiment 5 and embodiment 4 is that the solar cell assembly of this embodiment 5 includes multiple solar cell sheets 1A and welding strips 6 of embodiment 3, wherein the multiple solar cell sheets 1A are arranged in the same direction in sequence along the first direction.

[0075] In this embodiment 5, the welding ribbon 6 is connected to any solar cell 1A along the first direction, welded to the first welding pad 2 in the first distribution area 100 of the solar cell 1A, and sequentially extends through the third distribution area 101 and the fourth distribution area 111 of the adjacent solar cell 1A to the second distribution area 110 of the adjacent solar cell 1A, and welded to the second welding pad 3 of the second distribution area 110, and the welding ribbon 6 covers the first grid line 2A on the any solar cell 1A and the adjacent solar cell 1A.

[0076] In summary, the embodiment of the utility model provides a solar cell 1A and a photovoltaic module and a photovoltaic system, wherein the front side 10 of the cell body 1 is divided into a first distribution area 100 and a third distribution area 101, and the back side 11 of the cell body 1 is divided into a second distribution area 110 and a fourth distribution area 111, and the first distribution area 100 and the second distribution area 110 are respectively arranged on opposite sides of the cell body 1 in the first direction, so that the first soldering pad 2 and the second soldering pad 3 are only arranged in the first distribution area 100 and the second distribution area 110 on the two sides of the cell body, and the first grid line 2A is not arranged with a soldering pad in the third distribution area 101 outside the first distribution area 100 and the fourth distribution area 111 outside the second distribution area 110, so that the cell body 1 has and only has a soldering pad on the two sides. The layout structure of arranging the pads in the designated area greatly reduces the number of pads on the solar cell 1A, saves the production materials of the solar cell 1A, and reduces the production cost of the solar cell 1A and the solar cell module. Moreover, the first pad 2 and the second pad 3 are only arranged on one side of the cell body 1, and are not arranged in the area outside the first distribution area 100 and the second distribution area 110, so that the first grid line 2A is not provided with a pad outside the first distribution area 100 and the second distribution area 110. The first grid line 2A located between the connected first pad 2 and the second pad 3 is covered by the welding strip 6, which can ensure the conductive connection of each solar cell 1A in the solar cell module, so that each solar cell 1A can be connected in series or in parallel according to the design requirements.

[0077] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A solar cell, characterized in that: Including the battery cell body and pad, Two oppositely disposed side surfaces of the battery cell body are set as a front side and a back side, and the front side and the back side of the battery cell body are both provided with first grid lines arranged along a first direction, and the front side of the battery cell body is divided into a first distribution area and a third distribution area along the first direction, and the back side of the battery cell body is divided into a second distribution area and a fourth distribution area along the first direction, and the first distribution area and the second distribution area are respectively arranged on opposite sides of the battery cell body in the first direction; The pad is disposed on the first gate line in the first distribution area and on the first gate line in the second distribution area, and the first gate line is not disposed with the pad in the third distribution area outside the first distribution area and in the fourth distribution area outside the second distribution area.

2. The solar cell according to claim 1, characterized in that: The soldering pads include a first soldering pad arranged on the first grid line on the front side of the battery cell body and a second soldering pad arranged on the first grid line on the back side of the battery cell body, the first soldering pad and the second soldering pad are respectively arranged on the edges of the corresponding first grid lines; and within a single first grid line, the number of the first soldering pads and / or the second soldering pads is N, the N first soldering pads and / or the N second soldering pads are respectively spaced apart on the corresponding first grid lines, 1≤N≤4.

3. The solar cell according to claim 1 or 2, characterized in that: The solar cell is a main-grid cell. In the same cell body, the first grid line is a positive main grid arranged on the front side of the cell body and a negative main grid arranged on the back side of the cell body. Each positive main grid and each negative main grid are arranged along a first direction, which is the direction of the short side of the cell body.

4. The solar cell according to claim 3, characterized in that: There are multiple positive main grids, which are arranged in sequence along the second direction; there are multiple negative main grids, which are arranged in sequence along the second direction; and the first direction intersects with the second direction.

5. The solar cell according to claim 3, characterized in that: A positive electrode fine grid is also provided on the front side of the battery cell body, and a negative electrode fine grid is also provided on the back side of the battery cell body, and each of the positive electrode fine grids and each of the negative electrode fine grids are arranged along the second direction; there are multiple positive electrode fine grids, and the multiple positive electrode fine grids are arranged in sequence along the first direction; there are multiple negative electrode fine grids, and the multiple negative electrode fine grids are arranged in sequence along the first direction.

6. The solar cell according to claim 1 or 2, characterized in that: The solar cell is a busbar-less cell. In the same cell body, the first grid lines are front fine grids arranged on the front side of the cell body and back fine grids arranged on the back side of the cell body. Each front fine grid and each back fine grid are arranged along the first direction.

7. The solar cell according to claim 1, characterized in that: There are multiple pads, and the pads are arranged in sequence along the second direction.

8. A solar cell module, characterized in that: The invention comprises a plurality of solar cells and welding strips as claimed in any one of claims 1 to 7, wherein: The welding ribbon is connected to any solar cell, connected to the welding pad in the first distribution area or the second distribution area of ​​any solar cell, and extends to the adjacent solar cell along the first direction, connected to the corresponding welding pad in the second distribution area or the first distribution area of ​​the adjacent solar cell, and the welding ribbon covers the first grid line on any solar cell and the adjacent solar cell.

9. The solar cell assembly according to claim 8, characterized in that: The plurality of solar cells are arranged in the same direction along a first direction.

10. A photovoltaic system, characterized in that: Comprising the solar cell assembly as described in any one of claims 8-9.

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