Battery sheet, printing method of battery sheet, and photovoltaic module

Abstract

The application relates to a battery piece, a printing method of the battery piece and a photovoltaic module. The battery piece is rectangular, has a first surface and a second surface along the thickness direction of the battery piece, and is provided with welding spots on the battery piece. The welding spots are located on the first surface and the second surface, and the projection of the welding spot on the first surface and the projection of the welding spot on the second surface do not coincide along the thickness direction of the battery piece. In the application, the battery piece is rectangular, that is, the length and the width of the battery piece are different, so that the area of the battery piece is increased by increasing the length of the battery piece, and the area of the photovoltaic module is increased, and the power of the photovoltaic module is improved. Meanwhile, the width of the battery piece is set so that the battery piece provided by the application is still applicable to the existing connection, packaging and transportation mode of the battery piece, so that a new layout and packaging mode do not need to be designed, the power of the photovoltaic module is improved, and the production cost of the battery piece is not increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solar cells, in particular to a cell piece, a printing method of the cell piece and a photovoltaic module. BACKGROUND

[0002] Photovoltaic power generation is a technology of converting light energy into electric energy by using the photovoltaic effect of the semiconductor interface, and the core unit is a photovoltaic module. The photovoltaic module usually includes an encapsulation structure, a film and a cell string, and the cell string is formed by connecting a plurality of cell pieces through a welding strip. Therefore, the size of the cell piece directly affects the size of the photovoltaic module, and further affects the power of the photovoltaic module.

[0003] The existing cell piece is generally a square piece, and the commonly used ones are 182mm*182mm and 210mm*210mm. The photovoltaic module selected with the 182mm*182mm cell piece cannot meet the requirement of the power, and the size of the photovoltaic module selected with the 210mm*210mm cell piece does not conform to the size limitation of the container, which affects the transportation of the photovoltaic module. SUMMARY

[0004] The present application provides a cell piece, a printing method of the cell piece and a photovoltaic module. The cell piece can have the advantages of high power while being applicable to the existing packaging and transportation methods.

[0005] The cell piece provided by the present application is rectangular, and has a first surface and a second surface along the thickness direction of the cell piece.

[0006] The cell piece is provided with welding points, and the welding points are located on the first surface and the second surface and do not overlap in projection along the thickness direction of the cell piece. The distance d1 between the welding point on the first surface and the welding point on the second surface closest to the welding point on the first surface satisfies 0.2mm≤d1≤2mm.

[0007] In a possible implementation design, the welding points are uniformly arranged along the length direction or the width direction of the cell piece.

[0008] Or the distance between adjacent welding points gradually increases from the center of the cell piece to the edge.

[0009] In a possible implementation design, the length L and the width W of the cell piece satisfy L / 2+0.5mm≤W≤L / 2+5mm.

[0010] In a possible implementation design, the minimum distance d2 between the welding point and the edge of the cell piece along the arrangement direction of the welding point satisfies 0.3mm≤d2≤3mm.

[0011] In a possible implementation design, the battery piece is provided with a main grid and a sub-grid, the main grid includes a connecting line and a fish-tail structure, the fish-tail structure is located at the edge of the connecting line, and part of the sub-grid is connected with the fish-tail structure.

[0012] In a possible implementation design, at least 2 / 3 of the sub-grids connected with the fish-tail structure penetrate the fish-tail structure.

[0013] In a possible implementation design, all the sub-grids connected with the fish-tail structure penetrate the fish-tail structure.

[0014] In a possible implementation design, the battery piece has a cutting edge and a non-cutting edge, for the fish-tail structure close to the cutting edge, all the sub-grids connected therewith penetrate the fish-tail structure, and for the fish-tail structure close to the non-cutting edge, at least 2 / 3 of the sub-grids connected therewith penetrate the fish-tail structure.

[0015] The printing method of the battery piece provided in the embodiments of the present application is used for printing the battery piece described above, and the printing method of the battery piece includes:

[0016] printing the sub-grid on the cut battery piece;

[0017] printing the main grid and the welding point on the cut battery piece.

[0018] The photovoltaic module provided in the embodiments of the present application includes a battery string, an encapsulation layer and a cover plate, the battery string is connected by a plurality of battery pieces, the encapsulation layer is used for covering the surface of the battery string, and the cover plate is used for covering the surface of the encapsulation layer away from the battery string.

[0019] In the present application, the battery piece is rectangular, that is, the length and the width of the battery piece are different, so that the area of the battery piece is increased by increasing the length of the battery piece, and the area of the photovoltaic module is increased, and the power of the photovoltaic module is improved. At the same time, by setting the width of the battery piece, the battery piece provided in the present application is still applicable to the existing connection, packaging and transportation mode of the battery piece, so that a new layout and packaging mode do not need to be designed, the power of the photovoltaic module is improved, and the production cost of the battery piece is not increased. The first surface and the second surface are the upper surface and the lower surface of the battery piece, the projection of the welding point located on the first surface and the projection of the welding point located on the second surface do not coincide in the thickness direction of the battery piece, that is, the welding points on the first surface and the second surface are arranged in a staggered manner, so as to prevent the soldering tin from appearing on both sides of the same position on the battery piece at the same time, improve the strength of the battery piece, and make the battery piece less likely to crack.

[0020] It should be understood that the above general description and the following detailed description are only exemplary and cannot limit the present application.BRIEF DESCRIPTION OF DRAWINGS BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A structure schematic diagram of the battery piece provided by the present application in one embodiment is shown in the figure.

[0022] Figure 2 A structure schematic diagram of the battery piece provided by the present application in one embodiment is shown in the figure. Figure 1 A structure schematic diagram of the battery piece provided by the present application in one embodiment is shown in the figure.

[0023] Figure 3 A structure schematic diagram of the battery piece provided by the present application in one embodiment is shown in the figure. Figure 1 A structure schematic diagram of the battery piece provided by the present application in one embodiment is shown in the figure.

[0024] Figure 4 A structure schematic diagram of the battery piece provided by the present application in one embodiment is shown in the figure. Figure 1 A structure schematic diagram of the battery piece provided by the present application in one embodiment is shown in the figure.

[0025] Figure 5 A structure schematic diagram of the battery piece provided by the present application in one embodiment is shown in the figure.

[0026] Figure 6 A structure schematic diagram of the photovoltaic module provided by the present application in one embodiment is shown in the figure.

[0027] REFERENCE NUMERALS

[0028] 1 - battery piece

[0029] 2 - soldering point

[0030] 3 - main grid

[0031] 31 - connecting line

[0032] 32 - fish-tail structure

[0033] 4 - auxiliary grid

[0034] 110 - battery string

[0035] 120 - encapsulating layer

[0036] 130 - cover plate

[0037] The drawings herein are incorporated into and form part of the specification, show embodiments consistent with the present application, and together with the specification serve to explain the principles of the present application. DETAILED DESCRIPTION

[0038] In order to better understand the technical solutions of the present application, the embodiments of the present application are described in detail below in combination with the drawings.

[0039] It should be noted that the embodiments described are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0040] The terms used in the embodiments of the present application are merely for the purpose of describing particular embodiments and are not intended to limit the present application. The singular forms "a", "said" and "the" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0041] It should be understood that the term "and / or" used herein is only to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0042] It should be noted that the "up", "down", "left", "right" and other orientation words described in the embodiments of the present application are described from the angle shown in the drawings, and should not be understood as a limitation on the embodiments of the present application. In addition, in the context, it should also be understood that when referring to an element connected to another element "on" or "under", it can be directly connected to another element "on" or "under" or indirectly connected to another element "on" or "under" through an intermediate element.

[0043] The embodiments of the present application provide a battery piece 1, as shown in Figure 1 and Figure 2 The battery piece 1 is rectangular, and has a first surface and a second surface along the thickness direction of the battery piece 1. The battery piece 1 is provided with solder points 2, the solder points 2 are located on the first surface and the second surface, and the projection of the solder points 2 located on the first surface and the projection of the solder points 2 located on the second surface do not coincide along the thickness direction of the battery piece 1.

[0044] In the present embodiment, as shown in Figure 1 The battery piece 1 is rectangular, that is, the length and width of the battery piece 1 are different, so as to increase the area of the battery piece 1 by increasing the length of the battery piece 1, and further increase the area of the photovoltaic module and improve the power of the photovoltaic module. At the same time, by setting the width of the battery piece 1, the battery piece 1 provided by the present application is still suitable for the existing connection, packaging and transportation mode of the battery piece 1, so that there is no need to design new layout and packaging mode, and the power of the photovoltaic module is improved without increasing the production cost of the battery piece 1.

[0045] As shown in Figure 2As shown, the first surface and the second surface are the upper surface and the lower surface of the battery cell 1. Along the thickness direction of the battery cell 1, the projection of the solder point 2 on the first surface and the projection of the solder point 2 on the second surface do not coincide. That is, the solder point 2 on the first surface and the solder point 2 on the second surface are misaligned, thereby preventing the solder point 2 from accumulating solder on both sides at the same position on the battery cell 1 at the same time, improving the strength of the battery cell 1, and making the battery cell 1 less prone to microcracks.

[0046] In addition, solder joint 2 can be rectangular, circular, elliptical, or other shapes.

[0047] In one specific implementation, such as Figure 1 and Figure 2 As shown, the solder joints 2 are evenly arranged along the length or width of the battery cell 1 or from the center of the battery cell 1 to the edge, and the distance between adjacent solder joints 2 gradually increases.

[0048] In this embodiment, such as Figure 1 and Figure 2 As shown, the solder joints 2 are evenly arranged along the length or width of the cell 1, so that the current generated by the cell 1 can be better collected at the solder joints 2 and then output outward, preventing the power of the photovoltaic module from being affected by the inability of the solder joints 2 to effectively collect the current generated by the cell 1.

[0049] In addition, the distribution of solder points 2 on the battery cell 1 can also be such that the distance between adjacent solder points 2 gradually increases from the center of the battery cell 1 to the edge. By adjusting the distance between adjacent solder points 2, the overlap of solder points 2 on both sides of the battery cell 1 can be effectively avoided, ensuring the strength and rigidity of the battery cell 1 and making the battery cell 1 less prone to microcracks.

[0050] In one specific embodiment, the width of solder joint 2 is 0.5mm to 1.2mm, and the length of solder joint 2 is 0.6mm to 1.4mm. For example, the width of solder joint 2 can be 0.5mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, etc., and the length of solder joint 2 can be 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, etc.

[0051] In this embodiment, the size of the solder joint 2 should not be too large or too small. If the size of the solder joint 2 is too small (for example, the width of the solder joint 2 is less than 0.5 mm and the length is less than 0.6 mm), the solder joint 2 cannot provide sufficient welding tensile force, resulting in poor welding and affecting the performance of the battery cell 1. If the size of the solder joint 2 is too large (for example, the width of the solder joint 2 is greater than 1.2 mm and the length is greater than 1.5 mm), the raw materials required to form the solder joint 2 will increase, thus increasing the production cost of the battery cell. Therefore, when the width of the solder joint 2 is between 0.5 mm and 1.2 mm and the length of the solder joint 2 is between 0.6 mm and 1.4 mm, it is possible to reduce the production cost of the battery cell 1 while ensuring sufficient welding tensile force.

[0052] In one specific embodiment, the size of the solder joint 2 near the edge of the battery cell 1 is larger than the size of other solder joints 2 on the battery cell 1.

[0053] In this embodiment, such as Figure 1 As shown, since the proportion of poor solder joints at the edge of the battery cell 1 is relatively high, making the size of the solder joint 2 near the edge of the battery cell 1 larger than the size of other solder joints 2 on the battery cell 1 can reduce the proportion of poor solder joints 2 at the edge of the battery cell 1. Preferably, the length of the solder joint 2 near the edge of the battery cell 1 is 1.2 mm and the width is 0.8 mm, while the length of other solder joints 2 on the battery cell 1 is 0.8 mm and the width is 0.6 mm.

[0054] In one specific embodiment, along the length or width direction of the battery cell 1, the distance d1 between the solder joint 2 located on the first surface and the nearest solder joint 2 located on the second surface satisfies: 0.2mm ≤ d1 ≤ 2mm. For example, the distance d1 can specifically be: 0.2mm, 0.5mm, 1.0mm, 1.5mm, 2.0mm, etc.

[0055] In this embodiment, the distance d1 between the solder joint 2 on the first surface and the nearest solder joint 2 on the second surface along the length or width direction of the solar cell 1 should not be too large or too small. If the distance d1 is too large (e.g., greater than 2 mm), the solder joints 2 may be unevenly distributed on the solar cell 1, affecting the collection and discharge of the current generated by the solar cell 1, and thus affecting the power of the photovoltaic module. If the distance d1 is too small (e.g., less than 0.2 mm), the solder joint 2 on the first surface may not effectively avoid the solder joint 2 on the second surface, or vice versa, causing stress concentration on the solar cell 1 and making it prone to microcracks. Therefore, the distance d1 between the solder joint 2 on the first surface and the nearest solder joint 2 on the second surface along the length or width direction of the solar cell 1 satisfies the condition that 0.2 mm ≤ d1 ≤ 2 mm, which ensures both the rigidity and strength of the solar cell 1 and the smooth collection and discharge of the current generated by the solar cell 1.

[0056] In a specific embodiment, the length L and the width W of the cell sheet 1 satisfy: L / 2+0.5mm≤W≤L / 2+5mm. For example, the length L and the width W can satisfy: W=L / 2+0.5mm, W=L / 2+1mm, W=L / 2+3mm, W=L / 2+5mm, etc.

[0057] In the present embodiment, when the length L and the width W of the cell sheet 1 satisfy: L / 2+0.5mm≤W≤L / 2+5mm, on the one hand, the area of the photovoltaic module formed by connecting the cell sheets 1 is increased, thereby effectively improving the power of the photovoltaic module; on the other hand, since the size of each cell sheet 1 is slightly different from that of the existing cell sheet, the processing, packaging and transportation of the cell sheet 1 do not need to be changed, thereby effectively controlling the production cost of the cell sheet 1. At the same time, the number of the main grid 3 and the auxiliary grid 4 on the cell sheet 1 also does not need to be changed, and only the distance between the adjacent main grid 3 and the adjacent auxiliary grid 4 needs to be adjusted, thereby not increasing the production cost of the cell sheet 1.

[0058] Specifically, the area of the cell sheet 1 in the present application is increased by 5% to 20% compared with the area of the existing cell sheet 1, thereby effectively increasing the light receiving area of the photovoltaic module and improving the power of the photovoltaic module.

[0059] In a specific embodiment, along the arrangement direction of the solder joint 2, the minimum distance d2 between the solder joint 2 and the edge of the cell sheet 1 satisfies: 0.3mm≤d2≤3mm. For example, the minimum distance d2 between the solder joint 2 and the edge of the cell sheet 1 can be specifically 0.3mm, 0.5mm, 1mm, 2mm, 3mm, etc.

[0060] In the present embodiment, the minimum distance d2 between the solder joint 2 and the edge of the cell sheet 1 should not be too large or too small. If the distance d2 is too large (for example, greater than 3mm), the current flowing from the edge of the cell sheet 1 to the solder joint 2 is difficult, the current loss of the cell sheet 1 is increased, and the power of the photovoltaic module formed by connecting the cell sheets 1 is affected. If the distance d2 is too small (for example, less than 0.3mm), more solder joints 2 need to be arranged on the cell sheet 1, thereby increasing the production cost of the cell sheet 1. At the same time, the shielding of the solder joint 2 on the surface of the cell sheet 1 will affect the utilization of sunlight by the cell sheet 1, thereby affecting the photoelectric conversion efficiency of the cell sheet 1. Therefore, when the minimum distance d2 between the solder joint 2 and the edge of the cell sheet 1 satisfies: 0.3mm≤d2≤3mm along the arrangement direction of the solder joint 2, the power of the photovoltaic module formed by connecting the cell sheets 1 can be ensured.

[0061] In a specific embodiment, as shown in FIG. 1, the cell sheet 1 is a rectangular sheet, and the length L and the width W of the cell sheet 1 satisfy: L / 2+0.5mm≤W≤L / 2+5mm. Figure 1As shown in the figure, the battery piece 1 is provided with a main grid 3 and a sub-grid 4, the main grid 3 includes a connecting line 31 and a fishhook structure 32, the fishhook structure 32 is located at the edge of the connecting line 31, and part of the sub-grid 4 is connected with the fishhook structure 32.

[0062] In the embodiment, as shown in the figure, Figure 1 The main grid 3 and the sub-grid 4 are both located on the battery piece 1, the main grid 3 includes a connecting line 31 and a fishhook structure 32, part of the sub-grid 4 is connected with the connecting line 31, and part of the sub-grid 4 is connected with the fishhook structure 32. The main grid 3 is provided with a welding spot 2, and the fishhook structure 32 and the connecting line 31 are connected through the welding spot 2. Since the fishhook structure is located at the edge of the battery piece 1, the fishhook structure 32 can effectively collect the current collected by the sub-grid 4 at the edge of the battery piece 1, thereby improving the power of the battery piece 1.

[0063] In addition, as shown in the figure, Figure 5 The main grid 3 can be discontinuously arranged, thereby reducing the processing difficulty of the main grid 3.

[0064] Specifically, in the first embodiment, the first surface and the second surface of the battery piece 1 can both apply the main grid 3 structure as shown in the figure; in the second embodiment, the first surface and the second surface of the battery piece 1 can both apply the main grid 3 structure as shown in the figure; in the third embodiment, the first surface of the battery piece 1 can apply the main grid 3 structure as shown in the figure, and the second surface of the battery piece 1 can apply the main grid 3 structure as shown in the figure, or the first surface of the battery 1 can apply the main grid 3 structure as shown in the figure, and the second surface of the battery piece 1 can apply the main grid 3 structure as shown in the figure, so as to adapt to different application scenarios. Figure 1 Figure 5 Figure 1 Figure 5 Figure 5 Figure 1

[0065] In a specific embodiment, as shown in the figure, Figure 3 The sub-grid 4 connected with the fishhook structure 32 all penetrates the fishhook structure 32.

[0066] In the embodiment, as shown in the figure, Figure 3 The sub-grid 4 connected with the fishhook structure 32 all penetrates the fishhook structure 32, thereby improving the current collecting capacity of the fishhook structure 32, and improving the power of the battery piece 1 and the photovoltaic module.

[0067] In a specific embodiment, as shown in the figure, Figure 4 At least 2 / 3 of the sub-grid 4 connected with the fishhook structure 32 penetrates the fishhook structure 32.

[0068] In the embodiment, as shown in the figure, Figure 4 ​​​​​​As shown, at least 2 / 3 of the busbars 4 connected with the fish-tail structure 32 penetrate the fish-tail structure 32, which on the one hand ensures the current collecting ability of the fish-tail structure 32 and on the other hand reduces the paste required for forming the fish-tail structure 32, thereby reducing the production cost of the battery piece 1.

[0069] In a specific embodiment, as shown in Figure 3 and Figure 4 As shown, the battery piece 1 has a cutting edge and a non-cutting edge, for the fish-tail structure 32 close to the cutting edge, the busbars 4 connected therewith all penetrate the fish-tail structure 32, and for the fish-tail structure 32 close to the non-cutting edge, at least 2 / 3 of the busbars 4 connected therewith penetrate the fish-tail structure 32.

[0070] In the present embodiment, since the cutting edge of the battery piece 1 generates structural defects in the cutting process, which is prone to recombination of carriers, for the fish-tail structure 32 close to the cutting edge, making the busbars 4 connected therewith all penetrate the fish-tail structure 32 can improve the current collecting ability of the fish-tail structure 32 and effectively improve the power of the battery piece 1; since the non-cutting edge of the battery piece 1 has less structural defects and less recombination of carriers, for the fish-tail structure 32 close to the non-cutting edge, making at least 2 / 3 of the busbars 4 connected therewith penetrate the fish-tail structure 32 can reduce the paste required for forming the fish-tail structure 32, thereby reducing the production cost of the battery piece 1. Therefore, making the cutting edge and the non-cutting edge of the battery piece 1 have different fish-tail structures 32 can reduce the production cost of the battery piece 1 while ensuring that the current generated by the battery piece 1 is effectively collected.

[0071] In a specific embodiment, the number of main busbars 3 on a battery piece 1 is 14-16, and the distance between adjacent main busbars 3 is 10-15 mm. The number of busbars 4 on a battery piece 1 is 90-140, and the distance between adjacent busbars 4 is 0.5-1.5 mm.

[0072] In a specific embodiment, the number of soldering points 2 provided on a main busbar 3 is 3-15. For example, the number of soldering points provided on a main busbar 3 can be specifically 3, 5, 8, 10, 12, 15, etc.

[0073] The present application provides a printing method of a battery piece, which is used to print the battery piece 1 in the above embodiments. The printing method of the battery piece 1 comprises:

[0074] S1: printing the busbars 4 on the cut battery piece 1.

[0075] S2: printing the main busbars 3 and the soldering points 2 on the cut battery piece 1.

[0076] In this embodiment, since the sub-grid 4 is printed on the battery cell 1 first, and then the main grid 3 is printed on the battery cell 1, the position of the solder joint 2 can coincide with the sub-grid 4. When the position of the solder joint 2 coincides with the sub-grid 4, the solder joint 2 will still be connected to the main grid 3. The contact area between the solder joint 2 and the main grid 3 is large, and the connection strength is more reliable. Therefore, the solder joint 2 does not need to avoid the sub-grid 4, which reduces the printing difficulty.

[0077] This application provides a photovoltaic module, such as... Figure 6 As shown, the photovoltaic module includes: a cell string 110, an encapsulation layer 120, and a cover plate 130. The cell string 110 is formed by connecting multiple cells 1. The encapsulation layer 120 is used to cover the upper and lower surfaces of the cell string 110, and the cover plate 130 is used to cover the surface of the encapsulation layer 120 away from the cell string 110.

[0078] In this embodiment, such as Figure 6 As shown, multiple solar cells in the battery string 110 are electrically connected in series and / or parallel. A laminated module can be obtained by pressing the cover plate 130, encapsulation layer 120, and battery string 110 in a specific order using a lamination process. A frame can then be installed on the laminated module to form a photovoltaic module, facilitating transportation and use.

[0079] In addition, by encapsulating the battery string 110 with the encapsulation layer 120 and the cover plate 130, the photovoltaic module can be guaranteed to have high mechanical strength, reducing the impact of hail, wind, mechanical vibration and other conditions. The encapsulation process can also improve the sealing performance of the photovoltaic module, and improve its corrosion resistance and safety.

[0080] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery sheet, characterized by, The battery piece (1) is rectangular, and has a first surface and a second surface along the thickness direction of the battery piece (1); The battery piece (1) is provided with solder points (2), the solder points (2) are located on the first surface and the second surface, and the projection of the solder point (2) located on the first surface and the projection of the solder point (2) located on the second surface do not coincide along the thickness direction of the battery piece (1), and the distance d1 between the solder point (2) on the first surface and the closest solder point (2) on the second surface satisfies: 0.2mm≤d1≤2mm; The battery piece (1) is provided with a main grid (3) and a sub-grid (4), the main grid (3) includes a connecting line (31) and a fish-tail structure (32), and the fish-tail structure (32) is located at the edge of the connecting line (31); The battery piece (1) has a cutting edge and a non-cutting edge, and the cutting edge and the non-cutting edge have different fish-tail structures, for the fish-tail structure (32) close to the cutting edge, the sub-grid (4) connected thereto all penetrates the fish-tail structure (32), and for the fish-tail structure (32) close to the non-cutting edge, at least 2 / 3 of the sub-grid (4) connected thereto penetrates the fish-tail structure (32).

2. The battery sheet of claim 1, wherein, The solder points (2) are uniformly arranged along the length direction or the width direction of the battery piece (1); Or the distance between adjacent solder points (2) gradually increases from the center to the edge of the battery piece (1).

3. The battery sheet of claim 1, wherein, The length L and the width W of the battery piece (1) satisfy: L / 2+0.5mm≤W≤L / 2+5mm.

4. The battery sheet of claim 1, wherein, The minimum distance d2 between the solder point (2) and the edge of the battery piece (1) along the arrangement direction of the solder point (2) satisfies: 0.3mm≤d2≤3mm.

5. A method of printing a battery cell, characterized by, The printing method of the battery piece (1) according to any one of claims 1 to 4 comprises: Printing the sub-grid (4) on the cut battery piece (1); Printing the main grid (3) and the solder point (2) on the cut battery piece (1).

6. A photovoltaic module, characterized by, The photovoltaic module comprises: A battery string (110) connected by a plurality of battery pieces (1), the battery piece (1) being the battery piece (1) according to any one of claims 1 to 4; An encapsulation layer (120) for covering the surface of the battery string (110); A cover plate (130) for covering the surface of the encapsulation layer (120) away from the battery string (110).

Images