Solar cell module and photovoltaic system

Abstract

The utility model discloses a solar cell module and a photovoltaic system, and relates to the technical field of solar cells, the solar cell module comprises a plurality of cells and solder strips, the front and back surfaces of the cells are provided with first grid lines, the front surface of each cell is provided with a first distribution area, and the back surface of each cell is provided with a second distribution area. The first distribution area and the second distribution area are arranged on the two sides of the battery piece in the first direction respectively, and the bonding pads are arranged in the first distribution area and the second distribution area; one end of the welding strip is connected to the bonding pad in the first distribution area of any battery piece, and the other end of the welding strip sequentially passes through the first distribution area, the extension area and the second distribution area and extends to be connected to the bonding pad in the second distribution area of the adjacent battery piece. The welding strip of the solar cell module sequentially passes through the first distribution area, the extension area and the second distribution area, so that the length of the welding strip is greatly shortened, and the problem of insufficient welding caused by overlong length of the welding strip is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of solar cells, in particular to a solar cell 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 consumes more solder pad materials, which increases the production cost of solar cells. Moreover, when the soldering ribbon is soldered on two adjacent solar cells, the soldering ribbon will extend from the left side of one solar cell to the right side of the adjacent solar cell. The soldering ribbon needs to be soldered for a long distance, which can easily cause the soldering ribbon to be misaligned with the main grid, resulting in the problem of soldering ribbon cold soldering, affecting the production efficiency of solar cell modules. Utility Model Content

[0004] The utility model aims to provide a solar cell assembly and a photovoltaic system to solve the problems that too many solder joints are arranged on the existing solar cell sheets, resulting in waste of materials and too long soldering distance of solder strips, which easily leads to cold solder joints.

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

[0006] A solar cell assembly comprises a plurality of cells and welding strips, wherein:

[0007] Two oppositely arranged side surfaces of the battery cell are set as a front side and a back side, the front side of the battery cell is divided into a first distribution area and a third distribution area along a first direction, the back side of the battery cell is divided into a second distribution area and a fourth distribution area along the first direction, the first distribution area and the second distribution area are respectively arranged on opposite sides of the battery cell in the first direction; an extension area is formed between two adjacent battery cells;

[0008] A first grid line arranged along a first direction is provided on both the front and back sides of the battery cell, the first grid line continuously extends along the first direction from one side of the battery cell to the other side of the battery cell, and a welding pad is provided on the first grid line in the first distribution area and the first grid line in the second distribution area;

[0009] One end of the soldering ribbon is connected to the soldering pad of the first distribution area of ​​a battery cell, and the other end of the soldering ribbon passes through the first distribution area, the extension area and the second distribution area in sequence, and extends to connect to the soldering pad of the second distribution area of ​​an adjacent battery cell.

[0010] In some embodiments, the pads are respectively disposed at the end of the first grid line located on the front side of the battery cell and the end of the first grid line located on the back side of the battery cell.

[0011] In some embodiments, the battery cell is a busbar battery cell, and in any battery cell, the first busbar is a positive busbar disposed on the front side of the battery cell and a negative busbar disposed on the back side of the battery cell, and each positive busbar and each negative busbar are arranged continuously along the first direction.

[0012] 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.

[0013] In some embodiments, when the battery cell is a main grid battery cell, the front side of the battery cell is further provided with a positive electrode fine grid arranged along the second direction, and the back side of the battery cell is further provided with a negative electrode fine grid arranged along the second direction.

[0014] 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.

[0015] In some embodiments, the battery cell is a busbar-less battery cell, and in any battery cell, the first grid line is a front fine grid arranged on the front side of the battery cell and a back fine grid arranged on the back side of the battery cell, and each front fine grid and each back fine grid are arranged continuously along the first direction.

[0016] In some embodiments, there are multiple pads, and the multiple pads are arranged sequentially along the second direction.

[0017] In some embodiments, a plurality of battery cells are arranged in the same direction along the first direction.

[0018] Based on the aforementioned solar cell assembly, the utility model further provides a photovoltaic system, which includes the aforementioned solar cell assembly.

[0019] Compared with the prior art, the solar cell assembly and photovoltaic system implemented by the utility model have the following beneficial effects:

[0020] (1) In the solar cell module, welding pads are only arranged in the first distribution area and the second distribution area on the two sides of the solar cell. In the third distribution area outside the first distribution area and the fourth distribution area outside the second distribution area, no welding pads are arranged on the first grid line, thereby forming a layout structure in which welding pads are arranged only in the designated areas on the two sides of the solar cell, 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.

[0021] (2) One end of the welding ribbon of the solar cell module is connected to the welding pad of the first distribution area of ​​a battery cell, and the other end of the welding ribbon passes through the first distribution area, the extension area and the second distribution area in sequence, and is connected to the welding pad of the second distribution area of ​​an adjacent battery cell. Therefore, the welding ribbon does not cover the first grid line located in the second distribution area and the third distribution area. The length of the welding ribbon is close to the spacing between two adjacent battery cells, which greatly shortens the length of the welding ribbon and reduces the difficulty of welding the welding ribbon between the welding pads of two adjacent battery cells, effectively avoiding the problem of cold soldering due to the excessive length of the welding ribbon. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

[0025] Figure 4 It is a schematic diagram of the reverse side of the solar cell assembly in Example 2 of the utility model.

[0026] In the figure, 1, battery cell; 10, front side; 100, first distribution area; 101, third distribution area; 11, back side; 110, second distribution area; 111, fourth distribution area; 12, extension area; 2, first welding pad; 3, second welding pad; 4, first grid line; 5, positive electrode fine grid; 6, negative electrode fine grid; 7, welding strip. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] Example 1

[0032] like Figure 1-2 As shown, a solar cell assembly of Embodiment 1 of the utility model comprises a plurality of cells 1 and welding strips 7, wherein the cell 1 is a busbar cell, that is, a busbar is provided on the cell 1. It should be noted that, according to the design requirements of the busbar cell, the number of busbars provided on the cell 1 can be 1 or more. This Embodiment 1 specifically takes the MBB (12 busbars) cell as an example for further detailed description.

[0033] In this embodiment 1, a plurality of battery cells 1 are arranged in the same direction in sequence along a first direction. Figure 1 The direction of the short side of the cell 1 is shown. It should be noted that the cell 1 can also be arranged in other arrangements according to design requirements. Moreover, according to the performance requirements of the solar cell module, the number of cells 1 can be 2 or more.

[0034] Two opposite side surfaces are formed on the battery cell 1, namely a front side 10 and a back side 11. The front side of the battery cell 1 is divided into a first distribution area 100 and a third distribution area 101 along a first direction, and the back side of the battery cell 1 is divided into a second distribution area 110 and a fourth distribution area 111 along the first direction. The first distribution area 100 and the second distribution area 110 are respectively arranged on opposite sides of the battery cell 1 in the first direction; an extension area 12 is formed between two adjacent battery cells 1.

[0035] In the present embodiment 1, the front side 10 and the back side 11 of the battery cell 1 are both provided with the first grid line 4 arranged along the first direction, and the first grid line 4 extends continuously along the first direction from one side of the battery cell 1 to the other side of the battery cell 1, so on the front side 10 of the battery cell 1, the first grid line 4 is arranged in the first distribution area 100 and the third distribution area 101, and on the back side 11 of the battery cell 1, the first grid line 4 is arranged in the second distribution area 110 and the fourth distribution area 111. On the front side 10 of the battery cell 1, the first pad 2 connected to the first grid line 4 is arranged in the first distribution area 100, and on the back side 11 of the battery cell 1, the second pad 3 connected to the first grid line 4 is arranged in the second distribution area 110, and the first pad 2 and the second pad 3 are respectively arranged on both sides of the battery cell 1 in the first direction.

[0036] By only setting the first soldering pad 2 in the first distribution area 100 of the battery cell 1, and only setting the second soldering pad 3 in the second distribution area 110 of the battery cell 1, the battery cell 1 has and only has soldering 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 battery cell 1, saves the production materials of the battery cell 1, and reduces the production cost of the solar cell module.

[0037] 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, so in this embodiment 1, the first pad 2 is set on the left side of the battery cell 1, and the second pad 3 is set on the right side of the battery cell 1. In other embodiments, the first pad 2 can also be set on the right side of the battery cell 1, and correspondingly, the second pad 3 is set on the left side of the battery cell 1.

[0038] Specifically, in the present embodiment 1, on the front side 10 of the battery cell 1, the first grid line 4 is arranged along the first direction, and the first pad 2 corresponds to the arrangement position of the first grid line 4 and is arranged at the end of the arrangement path of the first grid line 4, that is, the first pad 2 is arranged at the left end of the first grid line 4, so that when the soldering tape 7 is connected to the first pad 2, it can be conductively connected to the first grid line 4, and the soldering tape 7 does not need to cover the first grid line 4 located in the third distribution area 101. Correspondingly, on the reverse side 11 of the battery cell 1, the second pad 3 also corresponds to the arrangement position of the first grid line 4 and is arranged at the right end of the first grid line 4.

[0039] In other embodiments, if the first soldering pad 2 is arranged on the right side of the battery cell 1, in this case, the first soldering pad 2 is arranged at the end of the first grid line 4 on the side, that is, on the front side 10 of the battery cell 1, the first soldering pad 2 is arranged at the right end of the first grid line 4, and correspondingly, on the back side 11 of the battery cell 1, the second soldering pad 3 is arranged at the left end of the first grid line 4.

[0040] like Figure 1-2 As shown, there are multiple first pads 2, and the multiple first pads 2 are arranged in sequence along the second direction; there are multiple second pads 3, and the multiple second pads 3 are arranged in sequence along the second direction. In this embodiment 1, the second direction is Figure 1 The second direction is perpendicular to the first direction, which is the direction of the long side of the battery cell 1. In other embodiments, based on the specification design of the battery cell 1, the first direction may also intersect with the second direction, but not perpendicularly.

[0041] like Figure 1-2 As shown, in this embodiment 1, the battery cell 1 has a main grid and a fine grid. Specifically, in the same battery cell 1, the front side 10 of the battery cell 1 is provided with a positive main grid and a positive fine grid 5, wherein:

[0042] The first grid line 4 located on the front side 10 of the battery cell 1 is a positive main grid, and there are multiple positive main grids, each of which extends continuously along the first direction from one side of the battery cell 1 to the other side of the battery cell 1, and the multiple positive main grids are arranged in sequence along the second direction; the first welding pad 2 is connected to the left end of the positive main grid;

[0043] There are multiple positive electrode fine grids 5 , each positive electrode fine grid 5 is arranged along the second direction, and multiple positive electrode fine grids 5 are arranged in sequence along the first direction.

[0044] Moreover, in the same battery cell 1, the reverse side 11 of the battery cell 1 is provided with a negative electrode main grid and a negative electrode fine grid 6, wherein:

[0045] The first grid line 4 located on the reverse side 11 of the battery cell 1 is a negative main grid, and the number of negative main grids is multiple, each negative main grid extends continuously along the first direction from one side of the battery cell 1 to the other side of the battery cell 1, and the multiple negative main grids are arranged in sequence along the second direction; the second pad 3 is connected to the right end of the negative main grid;

[0046] There are multiple negative electrode fine grids 6 , each of which is arranged along the second direction, and multiple negative electrode fine grids 6 are arranged in sequence along the first direction.

[0047] It should be noted that the positive electrode main grid and the negative electrode main grid are made of conductive materials, and are arranged on the battery cell 1 in a linear and continuous manner.

[0048] In this embodiment 1, one end of the welding ribbon 7 is connected to the first welding pad 2 of a battery cell 1, and the other end of the welding ribbon 7 passes through the first distribution area 100, the extension area 12 and the second distribution area 110 in sequence, and extends to connect to the second welding pad 3 of the adjacent battery cell 1, so that the two adjacent battery cells 1 are conductively connected.

[0049] It should be noted that in this embodiment 1, Figure 1 In the direction shown, the other end of the welding ribbon 7 passes through the first distribution area 100, the extension area 12 and the second distribution area 110 in sequence, which means that in any battery cell 1, the welding ribbon 7 connected to the first pad 2 will extend along the first direction toward the left side of the battery cell 1, and extend to the second pad 3 of another battery cell 1, so that the two adjacent battery cells 1 can be electrically connected without passing through the third distribution area 101 and the fourth distribution area 111 of any battery cell 1. At this time, the length of the welding ribbon 7 is the distance between the first pad 2 and the second pad 3 that are close to each other in the two adjacent battery cells 1, and the length of the welding ribbon 7 is close to the spacing between the two adjacent battery cells 1, and the length of the welding ribbon 7 is greatly reduced.

[0050] Based on the solar cell assembly of the present embodiment 1, the present embodiment 1 also provides a photovoltaic system, and the photovoltaic system includes the aforementioned solar cell assembly.

[0051] Example 2

[0052] The difference between this embodiment 2 and embodiment 1 is that Figure 3-4 As shown, in the solar cell assembly of the second embodiment, the cell 1 is a busbar-less cell, that is, the cell 1 does not have a busbar, so in the second embodiment, the first grid line 4 is a fine grid.

[0053] In this embodiment 2, on the front side 10 of the battery cell 1, the first grid line 4 serves as a front 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 4 of the front side 10 of the battery cell 1 and distributed in the first distribution area 100.

[0054] On the reverse side 11 of the cell 1 , the first grid line 4 serves as a reverse 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 4 on the reverse side 11 of the cell 1 and is distributed in the second distribution area 110 .

[0055] Similarly, one end of the welding ribbon 7 is connected to the first welding pad 2 of a battery cell 1, and the other end of the welding ribbon 7 passes through the first distribution area 100, the extension area 12 and the second distribution area 110 in sequence, and extends to connect to the second welding pad 3 of the adjacent battery cell 1, so that the two adjacent battery cells 1 are conductively connected. In this way, the two ends of the welding ribbon 7 are welded to the first welding pad 2 of the battery cell 1 and the second welding pad 3 of the adjacent battery cell 1, and the adjacent battery cells 1 can be electrically connected.

[0056] In summary, the embodiments of the utility model provide a solar cell module and a photovoltaic system, in which the cell 1 of the solar cell module is only provided with a first welding pad 2 on one side and a second welding pad 3 on the other side, so that the cell 1 has and only has welding pads arranged on one side on two sides, which greatly reduces the number of welding points on the cell 1, saves the production materials of the cell 1, and reduces the production cost of the solar cell module. Moreover, one end of the welding ribbon 7 of the solar cell module is connected to the first welding pad 2 of the first distribution area 100 of a cell 1, and the other end of the welding ribbon 7 passes through the first distribution area 100, the extension area 12 and the second distribution area 110 in sequence, and extends to be connected to the second welding pad 3 of the second distribution area 110 of the adjacent cell 1, so that the length of the welding ribbon 7 is close to the spacing between the two adjacent cell 1, so that the length of the welding ribbon 7 is greatly shortened, and the difficulty of welding the welding ribbon 7 between the first welding pad 2 and the second welding pad 3 is reduced, and the problem of cold welding caused by the excessive length of the welding ribbon 7 is effectively avoided.

[0057] 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 module, It is characterized in that It includes a plurality of battery cells and welding strips, wherein: Two oppositely arranged side surfaces of the battery cell are set as a front side and a back side, the front side of the battery cell is divided into a first distribution area and a third distribution area along a first direction, and the back side of the battery cell is divided into a second distribution area and a fourth distribution area along the first direction, the first distribution area and the second distribution area are respectively arranged on opposite sides of the battery cell in the first direction; an extension area is formed between two adjacent battery cells; First grid lines arranged along a first direction are provided on the front and back surfaces of the battery cell, the first grid lines continuously extend along the first direction from one side of the battery cell to the other side of the battery cell, and pads are provided on the first grid lines in the first distribution area and the first grid lines in the second distribution area; One end of the welding ribbon is connected to the welding pad of the first distribution area of ​​a battery cell, and the other end of the welding ribbon passes through the first distribution area, the extension area and the second distribution area in sequence, and extends to connect to the welding pad of the second distribution area of ​​an adjacent battery cell.

2. The solar cell module according to claim 1, It is characterized in that The pads are respectively arranged at the end of the first grid line located on the front side of the battery cell and the end of the first grid line located on the back side of the battery cell.

3. The solar cell module according to claim 1 or 2, It is characterized in that The battery cell is a busbar battery cell, and in any of the battery cells, the first busbar is a positive busbar arranged on the front side of the battery cell and a negative busbar arranged on the back side of the battery cell, each of the positive busbars and each of the negative busbars are arranged continuously along a first direction, and the first direction is the direction of the short side of the battery cell.

4. The solar cell module according to claim 3, It is 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 module according to claim 3, It is characterized in that The front side of the battery cell is also provided with positive electrode fine grids arranged along the second direction, and the back side of the battery cell is also provided with negative electrode fine grids arranged along the second direction.

6. The solar cell module according to claim 5, It is characterized in that 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.

7. The solar cell module according to claim 1 or 2, It is characterized in that The battery cell is a busbar-less battery cell, and in any of the battery cells, the first grid lines are front fine grids arranged on the front side of the battery cell and back fine grids arranged on the back side of the battery cell, and each of the front fine grids and each of the back fine grids are continuously arranged along the first direction.

8. The solar cell module according to claim 1, It is characterized in that There are multiple pads, and the pads are arranged in sequence along the second direction.

9. The solar cell module according to claim 1, It is characterized in that The plurality of battery cells are arranged in the same direction along a first direction.

10. A photovoltaic system, It is characterized in that The invention comprises a solar cell module as claimed in any one of claims 1 to 9.

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