Cells and solar modules

Abstract

The present application provides a battery cell and a solar cell module. The battery cell includes: a battery cell body; a main grid line arranged on the front of the battery cell body and close to the end of the battery cell body; and a back grid line arranged on the back of the battery cell body and close to the end of the battery cell body, and at least one of the back grid lines and at least one of the main grid lines are close to the same end; wherein the back grid line is farther away from the end of the battery cell body than the main grid line. The solar cell module includes a plurality of battery strings; wherein each of the battery strings is formed by connecting a plurality of the battery cells in sequence, and one end of one of the two adjacent battery strings is connected to one end of the other battery string, wherein the main grid line at one end of the one battery string and the back grid line at one end of the other battery string are spaced apart. The present application avoids the phenomenon of local short circuit black sheets caused when the battery strings are overlapped together.

Description

Technical Field

[0001] The present application belongs to the field of solar cells and relates to a solar cell and a solar cell module. Background Art

[0002] In recent years, energy issues have become one of the most concerned issues in the world, and the development and use of new energy has become a global consensus. As an easily accessible and inexhaustible energy source, solar energy has given rise to the solar photovoltaic industry. In recent years, the photovoltaic industry has developed rapidly, and innovative technologies have been continuously introduced.

[0003] It is known that in traditional solar cell modules, there are certain gaps between cells and between cell strings. Therefore, researchers have proposed some methods to eliminate the gaps, such as shingling technology (using conductive glue to stack the front and back cells together), stack welding technology (making the front and back cells overlap to a certain size, and then welding them together with welding ribbons), and splicing technology (using triangular welding ribbons to weld the front and back cells together, with basically no gap between the cells). However, these technologies have certain limitations and risks, such as the possibility of short circuits, which may cause the entire cell string to be short-circuited or even unable to generate electricity. Summary of the invention

[0004] In order to solve the above technical problems, on the one hand, the present application provides a battery cell designed with specific grid lines, including: a battery cell body; a main grid line arranged on the front side of the battery cell body and close to the end of the battery cell body; and a back grid line arranged on the back side of the battery cell body and close to the end of the battery cell body, and at least one of the back grid lines and at least one of the main grid lines are close to the same end; wherein the back grid line is farther away from the end of the battery cell body than the main grid line.

[0005] The distance between the back grid line and the end of the battery cell body is 0.3-1.5 mm greater than the distance between the main grid line and the end of the battery cell body.

[0006] Wherein, the distance between the main grid line and the end of the battery cell body is 0.5-0.8 mm.

[0007] Wherein, the distance between the back grid line and the end of the battery cell body is 0.8-2 mm.

[0008] The end portion includes a first end portion and a second end portion, and the first end portion and the second end portion are arranged facing each other on the battery cell body.

[0009] Wherein, the main gate line and the back gate line are parallel to each other.

[0010] Wherein, the width of the main gate line is equal to the width of the back gate line.

[0011] In a second aspect, the present application also provides a solar cell assembly, comprising a plurality of columns of battery strings; wherein each of the battery strings is formed by connecting the battery cells described in the first aspect above in sequence, and one end of one column of two adjacent battery strings is connected to one end of the other column of battery strings, wherein the main grid line at one end of the one column of battery strings is spaced from the back grid line at one end of the other column of battery strings.

[0012] The overlap width of two adjacent columns of battery strings is greater than 0 and less than 1.5 mm.

[0013] Wherein, the solar cell module is a whole-cell module, a half-cell module, a three-cell module, a six-cell module, or a combination thereof.

[0014] Wherein, the four corners of the edge of the component are rounded corners or concave right angles.

[0015] The present application designs specific grid lines on the battery cell, that is, the back grid lines on the back side of the battery cell body and close to the end of the battery cell body are retracted relative to the main grid lines arranged on the front side of the battery cell body and close to the end of the battery cell body. This can avoid the grid lines at the end of the back side of the battery cell body of one column of battery string overlapping with the grid lines at the end of the front side of the battery cell body of another column of battery string that overlaps, causing a local short-circuit black film phenomenon.

[0016] Compared with existing solar cell modules, the solar cell module provided in the present application shortens the gap between cell strings, further increases the effective power generation area of ​​the cell, improves the energy density of the module, and achieves a reduction in the cost per kilowatt-hour and an improvement in the conversion efficiency of the module. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The schematic diagram of the structure of an existing solar cell and the schematic diagram of the structure of a solar cell provided with a main grid line and a back grid line according to an embodiment of the present application are shown.

[0018] Figure 2 A cross-sectional schematic diagram of a solar cell string according to an embodiment of the present application is shown.

[0019] Figure 3 A schematic structural diagram of an existing solar cell assembly is shown.

[0020] Figure 4 A schematic structural diagram of a whole-piece assembly A-1 according to an embodiment of the present application is shown.

[0021] Figure 5A schematic structural diagram of a whole-piece assembly A-2 according to another embodiment of the present application is shown.

[0022] Figure 6 A schematic structural diagram of a half-chip assembly B-1 according to an embodiment of the present application is shown.

[0023] Figure 7 A schematic structural diagram of a half-chip assembly B-2 according to another embodiment of the present application is shown.

[0024] Figure 8 A schematic structural diagram of a half-chip assembly B-3 according to another embodiment of the present application is shown.

[0025] Fig. 9 A schematic structural diagram of a half-piece assembly B-4 according to another embodiment of the present application is shown.

[0026] Fig.10 A schematic structural diagram of a three-slice assembly C-1 according to an embodiment of the present application is shown.

[0027] Fig.11 A schematic structural diagram of a three-slice assembly C-2 according to another embodiment of the present application is shown.

[0028] Fig.12 A schematic structural diagram of a three-slice assembly C-3 according to another embodiment of the present application is shown.

[0029] Fig.13 A schematic structural diagram of a three-slice assembly C-4 according to another embodiment of the present application is shown.

[0030] Fig.14 A schematic structural diagram of a three-slice assembly C-5 according to another embodiment of the present application is shown.

[0031] Fig.15 A schematic structural diagram of a three-slice assembly C-6 according to another embodiment of the present application is shown.

[0032] Fig.16 A schematic structural diagram of a six-slice assembly D-1 according to an embodiment of the present application is shown.

[0033] Fig.17 A schematic structural diagram of a six-slice assembly D-2 according to another embodiment of the present application is shown.

[0034] Fig.18 A schematic structural diagram of a six-slice assembly D-3 according to another embodiment of the present application is shown.

[0035] Fig.19 A schematic structural diagram of a six-segment assembly D-4 according to another embodiment of the present application is shown.

[0036] Fig. 20 A schematic structural diagram of a six-segment assembly D-5 according to another embodiment of the present application is shown. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present application clearer, the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. However, those skilled in the art should understand that these embodiments are only used to illustrate the technical solution of the present application and are not limiting.

[0038] See also Figure 1 , where A is a schematic diagram of the structure of an existing battery cell, it can be seen that the distance L between the gate line 16 set on the front side 12 and the back side 14 of the battery cell body and the same end of the battery cell body 11 is the same. In practice, when a battery string consisting of a plurality of the existing battery cells is connected, it is easy to cause the gate line at the end of the back side of the battery cell body of the previous battery string to overlap with the gate line at the end of the front side of the battery cell body of the overlapping subsequent battery string, resulting in a local short circuit black film phenomenon.

[0039] In one embodiment of the present application, a battery cell having a specific grid line structure is provided. Figure 1 As shown, B is a schematic diagram of the structure of the battery cell of the present application. The battery cell 10 includes a battery cell body 11, a main grid line 13 arranged on the front side 12 of the battery cell body and close to the end of the battery cell body 11; and a back grid line 15 arranged on the back side 14 of the battery cell body and close to the end of the battery cell body 11, and at least one back grid line 15 and at least one main grid line 13 are close to the same end; wherein the back grid line 15 is farther away from the end of the battery cell body 11 than the main grid line 13.

[0040] Preferably, the distance between the back grid line 15 and the end of the battery cell body 11 is 0.3-1.5 mm greater than the distance between the main grid line 13 and the end of the battery cell body 11 .

[0041] The distance between the main grid line 13 and the end of the battery cell body 11 is 0.5-0.8 mm.

[0042] The distance L1 between the back grid line 15 and the end of the battery cell body 11 is 0.8-2 mm.

[0043] The end portion includes a first end portion and a second end portion, and the first end portion and the second end portion are disposed opposite to each other on the battery cell body 11 .

[0044] The main gate lines 13 and the back gate lines 15 are parallel to each other.

[0045] The present application does not specifically limit the width of the main gate line 13 and the width of the back gate line 15, that is, the width of the main gate line 13 and the width of the back gate line 15 can be equal, or greater than the width of the back gate line 15, or less than the width of the back gate line 15. Preferably, the width of the main gate line 13 and the width of the back gate line 15 are equal.

[0046] In another embodiment of the present application, a solar cell assembly is provided, comprising a plurality of columns of cell strings; wherein each of the cell strings is formed by sequentially connecting the cell sheets 10 described above, and one end of a cell string in one of two adjacent columns of cell strings is connected to one end of a cell string in the other column, wherein a main grid line at one end of the one column of cell strings is spaced from a back grid line at one end of the other column of cell strings, so that the contact area of ​​the end faces of adjacent cell strings is greatly increased, thereby reducing the stress generated by the overlap between adjacent cell strings and greatly reducing the risk of cell sheet breakage during the lamination process.

[0047] like Figure 2 As shown, in a preferred embodiment, adjacent battery strings 100, 200, and 300 are connected in sequence, and the back grid line 15 at the end of the battery string 100 and the main grid line 13 at the end of the battery string 200 have a spacing distance S, thereby avoiding direct contact between the grid lines at the ends of adjacent battery strings after overlapping, thereby avoiding the occurrence of local short circuits; at the same time, the contact area of ​​the end faces of adjacent battery strings is greatly increased, reducing the stress generated by the overlap between adjacent battery strings, and greatly reducing the risk of battery cell breakage during the lamination process.

[0048] Preferably, the overlapping parts of adjacent battery strings abut to form direct contact between the upper and lower surfaces, and there is no need to add insulating glue to the overlapping parts of adjacent battery strings, thus eliminating the use of insulating glue. This can save the process of laying insulating glue, greatly improve manufacturing efficiency and reduce manufacturing costs. In addition, since the insulating glue structure is omitted between the two battery strings, the overall thickness and weight of the solar cell module are reduced, making the solar cell module lighter and thinner. Preferably, the overlapping width of two adjacent battery strings is greater than 0 and less than 1.5 mm.

[0049] Wherein, the solar cell module is a whole-cell module, a half-cell module, a three-cell module, a six-cell module, or a combination thereof.

[0050] Optionally, the main grid lines 13 on the front side 12 of the battery cell body and the back grid lines 15 on the back side 14 of the battery cell body are maintained according to the above design; then further, the four corners of the edge of the solar cell module are designed to be chamfered (rounded) corners or "concave" right angles, etc., so that it can avoid the overlap of battery strings due to the position offset of a certain battery string, causing the back grid line at the end of the back side of the battery cell body of the previous battery string to overlap with the main grid line at the end of the front side of the battery cell body of the overlapping subsequent battery string, causing a local short circuit black film phenomenon.

[0051] Figure 3 The schematic diagram of the structure of an existing solar cell assembly is shown, wherein in the assembly, the distance between the grid line on the cell sheet and its end is L, such as 0.5-0.8 mm.

[0052] Figures 4 to 20 The schematic diagrams of the structures of the whole-piece components A-1 and A-2, half-piece components B-1, B-2, B-3, B-4, three-piece components C-1, C-2, C-3, C-4, C-5, C-6, and six-piece components D-1, D-2, D-3, D-4, and D-5, respectively, are shown according to the embodiments of the present application. The distance between the back grid line on the cell and its end is L1, such as 0.8 to 2 mm. For example, it includes but is not limited to 0.8 mm, 1.0 mm, 1.2 mm, 1.5 mm, 2.0 mm, or any range thereof, such as 0.8 to 1.5 mm, 1.0 mm to 2.0 mm, etc.

[0053] In one embodiment of the present application, a manufacturing process of a solar cell module is also provided, including: laying the front glass → adhesive film → battery string (the latter battery string is directly laid on the former battery string, and the overlapping width of adjacent battery strings is 0 to 1.5 mm, such as Figure 2 As shown) → Laying of adhesive film → Laying of back panel or rear glass, laminating for 10 to 35 minutes at 120℃~145℃, and finally trimming, framing and cleaning → finished component.

[0054] Those skilled in the art should understand that the above-mentioned embodiments are only some specific embodiments for implementing the present application, and in actual applications, various changes and modifications may be made thereto in form and details, all of which fall within the scope of protection of the present application.

Claims

1. A battery cell, characterized in that: include Battery cell body; A main grid line disposed on the front side of the battery cell body and close to the end of the battery cell body along a reference direction, wherein the reference direction is a direction perpendicular to the extension direction of the main grid line; and a back grid line disposed on the back side of the battery cell body and close to the end of the battery cell body along the reference direction, and at least one of the back grid lines and at least one of the main grid lines are close to the same end; Among them, along the reference direction, the back grid line is farther away from the end of the battery cell body than the main grid line, the distance between the main grid line and the end of the battery cell body is 0.5-0.8mm, and the distance between the back grid line and the end of the battery cell body is 0.8-2mm.

2. The battery cell according to claim 1, characterized in that: The distance between the back grid line and the end of the battery cell body is 0.3-1.5 mm greater than the distance between the main grid line and the end of the battery cell body.

3. The battery cell according to claim 1 or 2, characterized in that: The end portion includes a first end portion and a second end portion, and the first end portion and the second end portion are disposed opposite to each other on the battery sheet body.

4. The battery cell according to claim 1 or 2, characterized in that: The main gate line and the back gate line are parallel to each other.

5. The battery cell according to claim 4, characterized in that: The width of the main gate line is equal to the width of the back gate line.

6. A solar cell module, characterized in that: including multiple battery strings; Each of the battery strings is formed by connecting a plurality of battery cells as described in any one of claims 1 to 5 in sequence, and one end of one of two adjacent battery strings is connected to one end of the other battery string, wherein the main grid line at one end of the one battery string and the back grid line at one end of the other battery string are spaced apart.

7. The solar cell assembly according to claim 6, characterized in that: The overlap width of two adjacent columns of battery strings is greater than 0 and less than 1.5 mm.

8. The solar cell assembly according to claim 6 or 7, characterized in that: The solar cell module is a whole-cell module, a half-cell module, a three-cell module, a six-cell module, or a combination thereof.

9. The solar cell assembly according to claim 8, characterized in that: The four corners of the edge of the component are rounded or concave right angles.

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