Battery sheet and assembly, printing screen for battery sheet, and method for producing battery sheet

Abstract

The application provides a battery piece and an assembly, a printing screen plate of the battery piece and a battery piece production method, and relates to the technical field of solar photovoltaic technology. In the battery piece: at least one first staggered antenna column exists in all the antenna columns; the first staggered antenna column is arranged along the length direction of the main grid line; in the first staggered antenna column, the surface area of the two antenna columns at both ends is greater than that of the antenna column at the midpoint position, and the surface area of the antenna column is the area of the antenna column parallel to the surface of the body of the battery piece. The surface area of the two antenna columns at both ends in the first staggered antenna column is arranged to be larger, which can avoid the melting of the sub-grid line caused by the welding deviation of the welding strip with a high probability, and the surface area of the antenna column at the midpoint position is arranged to be smaller, which can not only avoid the melting of the sub-grid line caused by the welding deviation of the welding strip, but also greatly reduce the amount of silver paste, thereby reducing the cost of the battery piece.

Description

Technical Field

[0001] This invention relates to the field of solar photovoltaic technology, and in particular to a solar cell and module, a printing screen for the solar cell, and a method for producing the solar cell. Background Technology

[0002] Silver paste accounts for an increasingly larger proportion of the cost of solar cells, and reducing the amount of silver paste used is of great significance for reducing the cost of solar cells.

[0003] In the solar cell, the antennae are overlapped with the sub-busbars, which can largely prevent the sub-busbars from melting due to misalignment of the solder strips.

[0004] During their research on the aforementioned prior art, the inventors discovered that existing battery cells consume a significant amount of silver paste at the antennae, resulting in high battery cell costs. Summary of the Invention

[0005] This invention provides a battery cell and module, a printing screen for the battery cell, and a battery cell production method, aiming to solve the problem of high battery cell costs.

[0006] In a first aspect, the present invention provides a battery cell, comprising: a battery cell body and a grid structure disposed on the battery cell body, the grid structure comprising a main grid line, a sub-grid line perpendicular to the main grid line, and a beak portion, the sub-grid lines being spaced apart along the length direction of the main grid line, and the beak portion being used to connect the main grid line and the sub-grid line. All of the aforementioned antennae have at least one first staggered antennae column; the first staggered antennae column is arranged along the length direction of the main grid line; in the first staggered antennae column, the surface area of ​​the two antennae located at both ends is greater than the surface area of ​​the antennae located at the midpoint, and the surface area of ​​the antennae is: the area of ​​the antennae parallel to the surface of the battery cell body.

[0007] In this embodiment of the invention, the surface area of ​​the two antennae located at both ends of the first staggered antennae column is set to be larger, which can largely avoid the sub-grid line melting caused by solder strip misalignment. The surface area of ​​the antennae located at the midpoint is set to be smaller, which can not only avoid the sub-grid line melting caused by solder strip misalignment, but also significantly reduce the amount of silver paste used, thereby reducing the cost of the battery cell. In other words, this invention can not only avoid the sub-grid line melting caused by solder strip misalignment, but also significantly reduce the amount of silver paste used, thereby reducing the cost of the battery cell.

[0008] Optionally, in the first staggered antennae column, the length of the two antennae located at both ends is greater than the length of the antennae located at the midpoint. And / or, in the first staggered antennae column, the width of the two antennae located at both ends is greater than the width of the antennae located at the midpoint; Wherein, the length direction of the antennae is perpendicular to the length direction of the main grid line, and the length direction of the antennae is perpendicular to the width direction of the antennae.

[0009] Optionally, from one end to the other of the first staggered antennae array, the length of each antennae first decreases and then increases; And / or, from one end of the first staggered antennae array to the other end, the width of each of the antennae first decreases and then increases.

[0010] Optionally, from one end to the other of the first staggered antennae array, the length of each antennae decreases sequentially and then increases sequentially. And / or, from one end of the first staggered antennae array to the other end, the width of each of the antennae decreases sequentially and then increases sequentially.

[0011] Optionally, the first staggered antennae column consists of at least two antennae sets, and each antennae set includes at least two antennae; All antennae in each antennal set are of equal length; from one end of the first staggered antennal column to the other, the length of each antennal set first decreases and then increases; the length of each antennal set is equal to the length of one antenna in the antennal set; And / or, all antennae in each antennae set have the same width; from one end of the first staggered antennae column to the other end, the width of each antennae set first decreases and then increases; the width of the antennae set is equal to the width of one antenna in the antennae set.

[0012] Optionally, from one end to the other of the first staggered antennae array, the length of each antennae set first decreases and then increases sequentially; And / or, from one end of the first staggered antennae array to the other end, the width of each antennae set decreases sequentially and then increases sequentially.

[0013] Optionally, in the first staggered antennae column, there is no antennae at the midpoint position.

[0014] Optionally, the first staggered antennae are symmetrical about the midpoint of the first staggered antennae.

[0015] Optionally, the maximum length of the antennae is 1.2 mm.

[0016] A second aspect of the present invention provides another type of battery cell comprising: a battery cell body and a grid structure disposed on the battery cell body, the grid structure comprising main grid lines, sub-grid lines perpendicular to the main grid lines, and antennae, the sub-grid lines being spaced apart along the length direction of the main grid lines, the antennae being used to connect the main grid lines and the sub-grid lines, and at least two adjacent rows of second staggered antennae rows being present in all the antennae rows; the second staggered antennae rows being disposed along the length direction of the main grid lines; the second staggered antennae rows comprising at least one first antennae and at least one second antennae, wherein the surface area of ​​the second antennae is greater than the surface area of ​​the first antennae; the surface area of ​​the first antennae is the area of ​​the surface of the first antennae parallel to the battery cell body; The first antennae in a column of second staggered antennae and the second antennae in an adjacent column of second staggered antennae are collinear; A sub-grid line adjacent to a first antennae overlaps on a second antennae collinear with the first antennae in an adjacent row of staggered second antennae.

[0017] Optionally, the length of the second antennae is greater than the length of the first antennae; And / or, the width of the second antenna is greater than the width of the first antenna; Wherein, the length direction of the first antennae is perpendicular to the length direction of the main grid line, and the length direction of the first antennae is perpendicular to the width direction of the first antennae.

[0018] A third aspect of the present invention also provides a battery assembly, comprising: a front cover plate, a front encapsulation film, any of the aforementioned battery cells, a rear encapsulation film, and a rear cover plate, all stacked together.

[0019] In a fourth aspect, the present invention also provides a printing screen for a battery cell, the printing screen for printing the grid structure of any of the aforementioned battery cells.

[0020] A fifth aspect of the present invention also provides a method for producing a battery cell, comprising: printing the grid structure of the battery cell using the aforementioned printing screen for the battery cell.

[0021] The battery module, the printing screen for the battery cell, and the battery cell production method provided in this embodiment of the invention have the same or similar beneficial effects as the aforementioned battery cell. To avoid repetition, they will not be described again here. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of a battery cell according to an embodiment of the present invention is shown; Figure 2 A partial enlarged schematic diagram of a battery cell according to an embodiment of the present invention is shown; Figure 3 A partial structural schematic diagram of the first type of battery cell in an embodiment of the present invention is shown; Figure 4 A partial structural schematic diagram of a battery cell in the prior art is shown; Figure 5 A partial structural schematic diagram of the second type of battery cell in an embodiment of the present invention is shown; Figure 6 A partial structural schematic diagram of the third type of battery cell in an embodiment of the present invention is shown; Figure 7 A partial structural schematic diagram of the fourth type of battery cell in an embodiment of the present invention is shown; Figure 8 A partial structural schematic diagram of the fifth type of battery cell in an embodiment of the present invention is shown; Figure 9 A partial structural schematic diagram of the sixth type of battery cell in an embodiment of the present invention is shown.

[0024] Explanation of the attached drawing numbers: 1-Antentacle, 11-First Antennae, 12-Second Antennae, 2-Main Grid Line, 3-Sub-Grid Line. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Figure 1 A schematic diagram of the structure of a battery cell according to an embodiment of the present invention is shown. Figure 2 A partial enlarged schematic diagram of a battery cell according to an embodiment of the present invention is shown. Figure 2 yes Figure 1 Enlarged view of the area enclosed by the dashed box. (Refer to...) Figure 1 , Figure 2 As shown, the solar cell includes a solar cell body and a grid structure disposed on the solar cell body. The grid structure includes a main grid line 2, sub-grid lines 3 perpendicular to the main grid line 2, and a contact portion 1. The direction indicated by the dashed line L in the figure is the length direction of the main grid line 2. The sub-grid lines 3 are spaced apart along the length direction of the main grid line 1, and the contact portion 1 is used to connect the main grid line 3 and the sub-grid line 2.

[0027] Figure 4 A partial structural schematic diagram of a battery cell in the prior art is shown. (Refer to...) Figure 4 As shown, in each column of antennae, the surface area of ​​each antennae 1 is equal.

[0028] Figure 5 A partial structural schematic diagram of the second type of battery cell in an embodiment of the present invention is shown. Figure 6 A partial structural schematic diagram of the third type of battery cell in an embodiment of the present invention is shown. Figure 7 A partial structural schematic diagram of the fourth type of battery cell in an embodiment of the present invention is shown. Figure 8 A partial structural schematic diagram of the fifth type of battery cell according to an embodiment of the present invention is shown. (Refer to...) Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, all the antennae 1 contain at least one first staggered antennae column, which runs along the length of the main grid line 2. In the first staggered antennae column, the surface area of ​​the two antennae 1 at each end is greater than the surface area of ​​the antennae 1 at the midpoint. The surface area of ​​antennae 1 is the area of ​​the surface of antennae 1 parallel to the battery cell body. Figure 3 In the middle, the leftmost and rightmost antennal columns constitute the first staggered antennal column. The top and bottom ends of the leftmost first staggered column are the two ends of the first staggered column. The top and bottom ends of the rightmost first staggered column are the two ends of the first staggered column. The surface area of ​​the two antennal parts 1 at the top and bottom ends of the leftmost first staggered antennal column is larger than the surface area of ​​the antennal part 1 located at the midpoint. Figure 5 , Figure 6 , Figure 7 , Figure 8 In the middle, all four columns are the first uneven antennae section.

[0029] Specifically, the inventors discovered that weld strip misalignment most likely occurs near the starting and ending points of a weld, which are typically located at the two ends of a column of antennae. Weld strip misalignment is less likely to occur in the middle of a column of antennae. (Refer to...) Figure 1 , Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown in the embodiment of the invention, the inventors set the surface area of ​​the two end antennae 1 in the first staggered antennae array to be larger, which can largely avoid the sub-busbar meltdown caused by solder strip misalignment. The surface area of ​​the antennae array 1 at the midpoint is set to be smaller, which can not only avoid the sub-busbar meltdown caused by solder strip misalignment, but also significantly reduce the amount of silver paste used, thus reducing the cost of the solar cell. During the string bonding process, pads can be provided at the starting and ending solder joints. For a half-cell solar cell, the number of pads on a single main busbar 2 can be six.

[0030] It should be noted that the total number of antennae 1 with different surface areas in the entire battery cell is not specifically limited, nor is the proportion of each size antennae 1 specified. For example, Figure 2 The battery cell shown includes at least two types of antennae 1 with different surface areas. Figure 3 The battery cell shown includes at least three types of antennae 1 with different surface areas.

[0031] It should be noted that, in the first staggered antennae column, the surface area of ​​the antennae located at the midpoint is not specifically limited to how much smaller it is than the surface areas of the two antennae located at the two ends.

[0032] Optional, refer to Figure 3 , Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, in the first staggered antenna array, the lengths of the two antennae 1 at both ends are greater than the length of the antennae 1 at the midpoint, and the length direction of the antennae 1 is perpendicular to the length direction of the main grid line 2. The inventors set the lengths of the two antennae 1 at both ends of the first staggered antenna array to be larger, which can largely prevent the sub-grid line from melting due to solder strip misalignment. The length of the antennae 1 at the midpoint is set to be smaller, which, while still preventing sub-grid line melting due to solder strip misalignment, can also significantly reduce the amount of silver paste used, thus reducing the cost of the solar cell.

[0033] It should be noted that, in the first staggered antennae column, the length of the antennae located at the midpoint is not specifically limited to how much shorter it is than the lengths of the two antennae located at the two ends.

[0034] Optionally, in the first staggered antenna array, the width of the two antennae 1 at both ends is greater than the width of the antennae 1 at the midpoint. The width direction of the antennae 1 is parallel to the length direction of the main grid line 2, or the width direction of the antennae 1 is perpendicular to the length direction of the antennae 1. By setting the width of the two antennae 1 at both ends of the first staggered antenna array to be larger, the inventors can largely avoid the melting of the sub-grid line caused by solder strip misalignment. Meanwhile, the width of the antennae 1 at the midpoint is set to be smaller, which, while avoiding the melting of the sub-grid line caused by solder strip misalignment, can also significantly reduce the amount of silver paste used, thereby reducing the cost of the solar cell.

[0035] It should be noted that, in the first staggered antennae column, the width of the antennae located at the midpoint is not specifically limited to how much shorter it is than the width of the two antennae located at the two ends.

[0036] Optional, you can refer to Figure 6 As shown, from one end of the first staggered antenna array to the other, the length of each antenna 1 first decreases and then increases. That is, in the first staggered antenna array, the length of each antenna 1 decreases from both ends towards the midpoint. This situation further corresponds to the situation of solder strip misalignment, and further avoids the sub-busbar meltdown caused by solder strip misalignment, while also significantly reducing the amount of silver paste used, thus reducing the cost of the solar cell.

[0037] Optionally, from one end of the first staggered antenna array to the other, the width of each antenna 1 first decreases and then increases; that is, in the first staggered antenna array, the width of each antenna 1 decreases from both ends towards the midpoint. This further corresponds to the situation of solder strip misalignment, further avoiding the melting of the sub-busbars caused by solder strip misalignment, and also significantly reducing the amount of silver paste used, thereby reducing the cost of the solar cell. Optional, you can refer to Figure 6 As shown, from one end of the first staggered antenna array to the other, the length of each antenna 1 decreases sequentially and then increases sequentially. That is, in the first staggered antenna array, the length of each antenna 1 gradually decreases from both ends towards the midpoint, or the slope of the decrease in length from both ends towards the midpoint is equal. This situation corresponds more closely to the case of solder strip misalignment. Furthermore, it can avoid the melting of the sub-grid lines caused by solder strip misalignment, significantly reduce the amount of silver paste used, lower the cost of the solar cell, and facilitate the production of printing screens.

[0038] Optionally, from one end of the first staggered antenna array to the other, the width of each antenna 1 decreases sequentially and then increases sequentially. That is, in the first staggered antenna array, the width of each antenna 1 gradually decreases from both ends towards the midpoint, or the slope of the decrease in width of each antenna 1 from both ends towards the midpoint is equal. This configuration better corresponds to the situation of solder strip misalignment, further avoiding the melting of the sub-grid lines caused by solder strip misalignment, significantly reducing the amount of silver paste used, lowering the cost of the solar cell, and facilitating the production of printing screens.

[0039] Optional, you can refer to Figure 7 , Figure 8 As shown, the first staggered antennae array consists of at least two antennae clusters. Figure 7 The area outlined by the dashed line represents the various antennae sets. Each antennae set includes at least two antennae 1. All antennae 1 within each antennae set are of equal length. From one end of the first staggered antennae column to the other, the length of each antennae set first decreases and then increases. The length of an antennae set is equal to the length of one antennae 1 within that set. In other words, in the first staggered antennae column, the length of each antennae set gradually decreases from both ends towards the midpoint. This corresponds more closely to the situation of solder strip misalignment, further avoiding the melting of the sub-grid lines caused by solder strip misalignment, and significantly reducing the amount of silver paste used, thus lowering the cost of the solar cell.

[0040] like Figure 7 In the diagram, all four antennal column groups are first staggered antennal column groups. For each first staggered antennal column group, antennal column S1 includes 5 antennal segments 1, all 5 antennal segments 1 in antennal column S1 have equal lengths, and the length of antennal column S1 is the length of one antennal segment 1 in antennal column S1. Antennal column S2 includes 4 antennal segments 1, all 4 antennal segments 1 in antennal column S2 have equal lengths, and the length of antennal column S2 is the length of one antennal segment 1 in antennal column S2. Antennal column S3 includes 4 antennal segments 1, all 4 antennal segments 1 in antennal column S3 have equal lengths, and the length of antennal column S3 is the length of one antennal segment 1 in antennal column S3. Antennae set S4 includes four antennae 1, all four antennae 1 in set S4 are of equal length, and the length of antennae set S4 is equal to the length of one antennae 1 in set S4. Antennae set S5 corresponds to antennae set S3, antennae set S6 corresponds to antennae set S2, and antennae set S7 corresponds to antennae set S1. From antennae set S1 at one end of the first staggered antennae column to antennae set S7 at the other end, the length of each antennae set first decreases and then increases.

[0041] It should be noted that the degree to which the length of each set of antennae decreases or increases is not specifically limited. The number of antennae 1 contained in each set of antennae is also not specifically limited. Whether the number of antennae 1 contained in each set of antennae is equal is also not specifically limited.

[0042] Optionally, the first staggered antenna array consists of at least two antenna set groups, each antenna set including at least two antennae 1. All antennae 1 in each antenna set have the same width. From one end of the first staggered antenna array to the other, the width of each antenna set first decreases and then increases. The width of an antenna set is equal to the width of one antennae 1 within that set. That is, in the first staggered antenna array, the width of each antenna set gradually decreases from both ends towards the midpoint. This corresponds more closely to the situation of solder strip misalignment, further avoiding the melting of the sub-grid lines caused by solder strip misalignment, and significantly reducing the amount of silver paste used, thus lowering the cost of the solar cell.

[0043] It should be noted that the degree to which the width of each antennal portion set decreases or increases is not specifically limited. The number of antennal portions 1 contained in each antennal portion set is also not specifically limited. Whether the number of antennal portions 1 contained in each antennal portion set is equal is also not specifically limited.

[0044] Optional, you can refer to Figure 7 , Figure 8 As shown, from one end of the first staggered antenna array to the other, the lengths of each antenna set first decrease and then increase sequentially. That is, in the first staggered antenna array, the lengths of each antenna set gradually decrease from both ends towards the middle, or in other words, the slope of the decrease in length of each antenna 1 from both ends towards the middle is equal. This situation corresponds more closely to the case of solder strip misalignment. Furthermore, it can avoid the melting of the sub-grid lines caused by solder strip misalignment, significantly reduce the amount of silver paste used, lower the cost of the solar cell, and facilitate the production of printing screens.

[0045] Optionally, from one end of the first staggered antenna array to the other, the width of each antenna array first decreases and then increases sequentially. That is, in the first staggered antenna array, the width of each antenna array gradually decreases from both ends towards the middle, or the slope of the decrease in width of each antenna 1 from both ends towards the middle is equal. This configuration better corresponds to the situation of solder strip misalignment. Furthermore, it can avoid the melting of the sub-grid lines caused by solder strip misalignment, significantly reduce the amount of silver paste used, lower the cost of the solar cell, and facilitate the production of printing screens.

[0046] Optional, you can refer to Figure 6 , Figure 8As shown, in the first staggered antennae column, there is no antennae at the midpoint. Specifically, the inventors found that the probability of the solder strip being misaligned at this midpoint is extremely small. Therefore, the antennae can be omitted, further reducing the amount of silver paste used.

[0047] Optional, you can refer to Figure 5 , Figure 6 , Figure 7 , Figure 8 As shown, the first staggered antennae are symmetrical about the midpoint of the first staggered antennae. The inventors discovered that the probability of welding deviation at the starting point and the ending point is approximately equal, and the distribution of the weld strip is approximately the same. The symmetry of the first staggered antennae about the midpoint of the first staggered antennae facilitates the fabrication of the antennae.

[0048] Optional, refer to Figure 3 As shown, the maximum length of the antennae 1 is 1.2mm, that is, d1+d1≤1.2mm. The maximum length of the antennae 1 is 1.2mm, which can reduce the amount of silver paste used and also avoid the breakage of the sub-gate.

[0049] Figure 9 A partial structural schematic diagram of the sixth type of battery cell in an embodiment of the present invention is shown. An embodiment of the present invention also provides another type of battery cell, see below. Figure 1 , Figure 9 As shown, the solar cell can also include: a solar cell body and a grid structure disposed on the solar cell body. The grid structure includes: a main grid line 2, sub-grid lines 3 perpendicular to the main grid line 2, and a contact portion 1. The direction indicated by the dashed line L in the figure is the length direction of the main grid line 2. The sub-grid lines 3 are spaced apart along the length direction of the main grid line 1, and the contact portion 1 is used to connect the main grid line 3 and the sub-grid line 2.

[0050] You can refer to Figure 9 As shown, at least two adjacent rows of second staggered antennae exist in all the antennae. The second staggered antennae rows are arranged along the length direction of the main grid line 2. The second staggered antennae rows include at least one first antennae 11 and at least one second antennae 12, wherein the surface area of ​​the second antennae 12 is larger than the surface area of ​​the first antennae 11.

[0051] Figure 9 The four columns are all second staggered antenna columns. The first antenna 11 in one column of the second staggered antenna column and the second antenna 12 in the adjacent column of the second staggered antenna column are collinear. The first first antenna 11 from top to bottom in the leftmost column is collinear with the second antenna 12 in the second column of the second staggered antenna column from left to right. The subgrid line that overlaps with the first antenna 11 can overlap with the second antenna 12 in the adjacent column that is collinear. This not only reduces the amount of silver paste used, but also avoids the breakage of the subgrid line.

[0052] The number of first antennae 11 and the number of second antennae 12 in each column of the second staggered antennae are not specifically limited. The number of second antennae 12 may be greater than or equal to the number of first antennae 11. The specific extent to which the surface area of ​​the second antennae is larger than that of the first antennae is not specifically limited in this embodiment of the invention. For example, in a column of second staggered antennae, all odd-numbered positions from top to bottom can be first antennae 11, and in adjacent columns of second staggered antennae, all even-numbered positions from top to bottom can be second antennae 12.

[0053] Optional, refer to Figure 9 As shown, the length of the second antenna portion 12 is greater than the length of the first antenna portion 11. The sub-grid line that overlaps with the first antenna portion 11 can overlap with the second antenna portion 12 that is in the adjacent column and collinear. This not only reduces the amount of silver paste used, but also avoids the breakage of the sub-grid line.

[0054] Optionally, the width of the second antenna portion is greater than the width of the first antenna portion. The sub-gate that overlaps with the first antenna portion can overlap with the second antenna portion that is collinear in the adjacent column. Similarly, this not only reduces the amount of silver paste used, but also avoids breakage of the sub-gate line.

[0055] Optionally, the maximum length of the antennae is 1.2 mm, which can reduce the amount of silver paste used and also prevent the sub-grid lines from breaking.

[0056] Optionally, for a single solar cell, the number of sub-grid lines can be 128, and the number of antennae can be 1152.

[0057] This invention also provides a battery assembly, which includes a front cover plate, a front encapsulation film, any of the aforementioned battery cells, a rear encapsulation film, and a rear cover plate stacked together. The battery assembly has the same or similar beneficial effects as the aforementioned battery cells, and will not be described again here to avoid repetition.

[0058] This invention also provides a printing screen for a battery cell, which is used to print the grid line structure of any of the aforementioned battery cells. Specifically, the printing screen for the battery cell may include: a screen pattern corresponding to the main grid lines, a screen pattern corresponding to the sub-grid lines perpendicular to the screen pattern corresponding to the main grid lines, and a screen pattern corresponding to the antennae. The screen patterns corresponding to the sub-grid lines are spaced apart along the length direction of the screen pattern corresponding to the main grid lines, and the screen pattern corresponding to the antennae is used to connect the screen patterns corresponding to the main grid lines and the screen patterns corresponding to the sub-grid lines. The screen pattern corresponding to the antennae corresponds to the same antennae structure in any of the aforementioned battery cells, and the two can be referenced to each other and can achieve the same or similar beneficial effects. To avoid repetition, it will not be described in detail here.

[0059] This invention also provides a method for producing solar cells. This method can use any of the aforementioned solar cell printing screens to print the grid structure of the solar cell. This method has the same or similar beneficial effects as the aforementioned solar cells or solar cell printing screens. To avoid repetition, it will not be described again here.

[0060] It should be noted that, for the sake of simplicity, the method embodiments are all described as a series of actions. However, those skilled in the art should understand that the embodiments of this application are not limited to the described order of actions, because according to the embodiments of this application, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also understand that the embodiments described in the specification are all preferred embodiments, and the actions involved are not necessarily essential to the embodiments of this application.

[0061] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0062] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, air conditioner, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0063] The embodiments of the present invention have been described above with reference to the accompanying drawings. However, the present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present invention.

Claims

1. A solar cell comprising: A battery cell body and a grid structure disposed on the battery cell body, the grid structure including main grid lines, sub-grid lines perpendicular to the main grid lines, and a beak-like portion, the sub-grid lines being spaced apart along the length direction of the main grid lines, and the beak-like portion being used to connect the main grid lines and the sub-grid lines, characterized in that: All of the aforementioned antennae include at least one first staggered antennae column; the first staggered antennae column is arranged along the length direction of the main grid line; the first staggered antennae column consists of at least two antennae sets, each antennae set includes at least two antennae, all antennae in each antennae set have equal length, and / or, all antennae in each antennae set have equal width; in the first staggered antennae column, the surface area of ​​the two antennae located at both ends is greater than the surface area of ​​the antennae located at the midpoint, and the surface area of ​​the antennae is: the area of ​​the antennae parallel to the surface of the battery cell body.

2. The battery cell according to claim 1, characterized in that, In the first staggered antennal column, the length of the two antennal segments at both ends is greater than the length of the antennal segment at the midpoint. And / or, in the first staggered antennae column, the width of the two antennae located at both ends is greater than the width of the antennae located at the midpoint; Wherein, the length direction of the antennae is perpendicular to the length direction of the main grid line, and the length direction of the antennae is perpendicular to the width direction of the antennae.

3. The battery cell according to claim 1, characterized in that, From one end of the first staggered antennal column to the other end, the length of each antennal column first decreases and then increases; the length of each antennal column is equal to the length of one antennal column in the antennal column. And / or, from one end of the first staggered antennae array to the other end, the width of each antennae set first decreases and then increases; the width of the antennae set is equal to the width of one antennae in the antennae set.

4. The battery cell according to claim 3, characterized in that, From one end of the first staggered antennae array to the other end, the lengths of each antennae set first decrease and then increase sequentially; And / or, from one end of the first staggered antennae array to the other end, the width of each antennae set decreases sequentially and then increases sequentially.

5. The battery cell according to any one of claims 1 to 4, characterized in that, In the first row of staggered antennae, there is no antenna at the midpoint.

6. The battery cell according to any one of claims 1 to 4, characterized in that, The first staggered antennae are symmetrical about the midpoint of the first staggered antennae.

7. The battery cell according to any one of claims 1 to 4, characterized in that, The maximum length of the antennae is 1.2 mm.

8. A solar cell comprising: A battery cell body and a grid structure disposed on the battery cell body, the grid structure including main grid lines, sub-grid lines perpendicular to the main grid lines, and a beak-like portion, the sub-grid lines being spaced apart along the length direction of the main grid lines, and the beak-like portion being used to connect the main grid lines and the sub-grid lines, characterized in that: All of the aforementioned antennae have at least two adjacent rows of second staggered antennae; the second staggered antennae rows are arranged along the length direction of the main grid line; the second staggered antennae rows include at least one first antennae and at least one second antennae, wherein the surface area of ​​the second antennae is greater than the surface area of ​​the first antennae, and the number of second antennae is greater than or equal to the number of first antennae; the surface area of ​​the first antennae is the area of ​​the surface of the first antennae parallel to the battery cell body; The first antennae in a column of second staggered antennae and the second antennae in an adjacent column of second staggered antennae are collinear; A sub-grid line adjacent to a first antennae overlaps on a second antennae collinear with the first antennae in an adjacent row of staggered second antennae.

9. The battery cell according to claim 8, characterized in that, The length of the second antenna is greater than the length of the first antenna; And / or, the width of the second antenna is greater than the width of the first antenna; Wherein, the length direction of the first antennae is perpendicular to the length direction of the main grid line, and the length direction of the first antennae is perpendicular to the width direction of the first antennae.

10. A battery assembly, characterized in that, include: A front cover plate, a front encapsulation film, a battery cell as described in any one of claims 1 to 9, a rear encapsulation film, and a rear cover plate are stacked together.

11. A printing screen for battery cells, characterized in that, The printing screen of the battery cell is used to print the grid structure of the battery cell according to any one of claims 1 to 9.

12. A method for producing solar cells, characterized in that, include: The grid structure of the battery cell is printed using the screen printing plate of claim 11.

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