Solar cell electrode

Abstract

The utility model discloses a solar cell electrode, which relates to the technical field of cells and comprises a cell piece, a grid line electrode forming ohmic contact with the cell piece is arranged on the surface of the cell piece, the grid line electrode comprises a plurality of main grid lines and a plurality of auxiliary grid lines which are perpendicular to each other, and square points are arranged at two ends of each main grid line. Each main grid line comprises a plurality of first connecting lines and a plurality of second connecting lines which are arranged in a staggered manner; the first connecting lines and the second connecting lines are arranged at intervals, so that the effective welding range during welding of the welding wires is enlarged, the contact between the welding wires and the main grid lines is improved, and the final battery quality is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a solar cell electrode. Background Art

[0002] Solar cells need to be interconnected through welding wires to form a high-power photovoltaic module. However, automated welding equipment cannot achieve a completely centered arrangement of the welding wires, and the welding may shift to the left or right during welding.

[0003] For example, Chinese patent CN219419043U, published on July 25, 2023, provides a solar cell and photovoltaic module, which involves the field of new energy. The solar cell includes a cell and a grid electrode, which is arranged on the surface of the cell and forms an ohmic contact with the cell; the grid electrode includes a number of parallel main grid lines, and each main grid line is also connected to a number of secondary grid lines; each main grid line is provided with pads at both ends and the middle section, and the span of each pad on the vertical main grid line is defined as the width of the pad, and the width of the pad at the end point is the largest, and the pads in the middle section are arranged alternately in the order of width. The human-computer interaction module of the device is also exposed when it is not working, and it is easy to be damaged by external factors. This solution expands the width of the pad on the main grid line so that the welding wire can be connected to the pad regardless of whether it is biased to the left or right, but it may only be connected to the pad, while other main grid lines are not connected, the overall connection position is insufficient, and the current flow efficiency is low. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the existing welding wire deflection affects the battery function. A solar cell electrode is proposed to effectively solve the influence caused by the welding wire deflection.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is: a solar cell electrode, including a cell sheet, a grid line electrode forming an ohmic contact with the cell sheet is provided on the surface of the cell sheet, the grid line electrode includes a plurality of main grid lines and a plurality of auxiliary grid lines perpendicular to each other, each of the main grid lines is provided with square points at both ends, and each of the main grid lines includes a plurality of first connecting lines and a plurality of second connecting lines arranged in an alternating manner.

[0006] A solar cell electrode, wherein the entire main grid line is composed of square points at both ends and a first connecting line and a second connecting line arranged alternately in the middle, a certain interval is provided between the first connecting line and the second connecting line on the left and right sides, and this interval enables the welding wire to be connected to most of the main grid lines when it deviates to the left or right, thereby increasing the contact area between the welding wire and the main grid lines when the welding wire deviates, and improving the product quality of the final battery.

[0007] Preferably, the middle position between the first connecting line and the second connecting line and the center position of the square point are on the same straight line. The welding position of the welding wire is set to be the straight line.

[0008] Preferably, the spacing between the first connecting line and the second connecting line is 50 to 150 micrometers. The spacing between the first connecting line and the second connecting line is set to be adapted to the degree of left-right deviation that may occur during welding of the welding wire.

[0009] Preferably, the width of the square point is 0.5-1.0 mm, and the length of the square point is 0.6-1.5 mm. The square point is a rectangle, which increases the contactable range on the left and right.

[0010] Preferably, a welding wire is provided between the first connecting line and the second connecting line, and a welding setting point is located at a middle position between the first connecting line and the second connecting line.

[0011] Preferably, the cross-sectional diameter of the welding wire is 0.15-0.3 mm. The diameter of the welding wire is larger than the distance between the first connecting wire and the second connecting wire, and when the welding wire is exactly in the middle position, it can be connected to both the first connecting wire and the second connecting wire.

[0012] Preferably, the auxiliary grid lines are line segments with a width of 10 to 50 micrometers and arranged at equal or unequal intervals. The auxiliary grid lines are divided by the main grid lines.

[0013] Preferably, the width of the first connecting line and the second connecting line are both 20 to 60 micrometers. The first connecting line and the second connecting line are the same.

[0014] The substantial effect of the utility model is as follows: the utility model increases the effective welding range of the welding wire, improves the final contact between the welding wire and the main grid line, and improves the final battery quality by dividing the main grid line into three parts: a square point, a first connecting line, and a second connecting line, and arranging the first connecting line and the second connecting line at intervals on the left and right. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a gate line arrangement diagram of the gate line electrode of the first embodiment.

[0016] Figure 2 This is a diagram of the connection between the gate line electrode and the welding wire in Example 1.

[0017] Among them: 1. main grid line, 101. square point, 102. first connecting line, 103. second connecting line, 2. auxiliary grid line, 3. welding wire. DETAILED DESCRIPTION

[0018] The specific implementation of the utility model is further described below through specific embodiments and in conjunction with the accompanying drawings.

[0019] Embodiment one:

[0020] A solar cell electrode, such as Figure 1 As shown, one of the electrode settings on a solar cell is shown. A cell is provided on the solar cell for electrode connection, and the grid electrode on the cell is the position where the current inside the battery interacts with the outside of the battery. In order to realize the mutual series connection between the batteries, it is necessary to connect them through welding wire 3. When the welding wire 3 is connected in series, the main grid line 1 along the grid electrode connects different batteries in series. The grid electrode is composed of a horizontal auxiliary grid line 2 and a longitudinal main grid line 1, and the main grid line 1 and the auxiliary grid line 2 are in a state perpendicular to each other. The main grid line 1 is composed of three parts: a square point 101, a first connecting line 102 and a second connecting line 103.

[0021] The square points 101 are located at both ends of the main grid line 1, at the intersection between the main grid line 1 and the main grid line 1, the secondary grid line 2 and the secondary grid line 2, and the main grid line 1 and the secondary grid line 2, that is, between adjacent square points 101 located on the same horizontal straight line is a single secondary grid line 2, between adjacent square points 101 located on the same vertical straight line is a single main grid line 1, and the connection points of adjacent main grid lines 1 share the same square point 101.

[0022] The first connection lines 102 and the second connection lines 103 on the main grid line 1 are arranged in an interlaced manner, that is, if the square point 101 near the top is the first connection line 102, then the first connection line 102 is followed by the second connection line 103, and then the arrangement is changed to the second connection line 103 again, and they are arranged alternately in sequence to form a complete main grid line 1. In addition, the first connection lines 102 and the second connection lines 103 on the main grid line 1 are not connected end to end, the first connection lines 102 are uniformly on a straight line, and the second connection lines 103 are on another straight line. The total number of the first connection lines 102 and the second connection lines 103 set in this embodiment is five, and there are five first connection lines 102 and second connection lines 103 constituting a main grid line 1. It can be three first connection lines 102 or two second connection lines 103, or it can be two first connection lines 102 and three second connection lines 103, but all the main grid lines 1 are the same. The number of the first connection lines 102 and the second connection lines 103 in each main grid line 1 can be set according to actual conditions.

[0023] The square point 101 is in the shape of a square, and its center point is located on the secondary grid line 2, and the side lines of the square point 101 are parallel or perpendicular to the secondary grid line 2, and the longer side of the square point 101 is parallel to the secondary grid line 2. The center of the square point 101 and the midline between the first connecting line 102 and the second connecting line 103 are on the same straight line, and the straight line is the position where the welding wire 3 is set to be welded.

[0024] The two ends of the first connecting line 102 and the second connecting line 103 adjacent to each other on the left and right are connected by a secondary grid line 2, and the length and width of all the secondary grid lines 2 are the same, and the width of the first connecting line 102 and the second connecting line 103 is the same, and the length can be set to be the same or different. The final formed grid electrode will be composed of rectangular squares, and two adjacent first connecting lines 102 in the horizontal direction and the upper and lower secondary grid lines 2 connected thereto form a rectangular square, and two adjacent second connecting lines 103 in the horizontal direction and the upper and lower secondary grid lines 2 connected thereto form another rectangular square. On the same horizontal plane, the same rectangular square is connected end to end, and in the vertical direction, two different rectangular squares are staggered, and the four corners of the two rectangular squares are not connected, showing a staggered shape. The two rectangular squares at the edge of the grid electrode are cut off by the edge line to form rectangular squares of different sizes. Since the first connection lines 102 and the second connection lines 103 may be the same or different, the two rectangular grids are rectangles with the same length but the same or different widths, which are determined according to the relationship between the first connection lines 102 and the second connection lines 103 .

[0025] like Figure 2 As shown, when the battery is processed and packaged to form a component, the welding is automatically arranged by the string welding machine, and the interconnection between the batteries is realized by the welding wire 3. When the welding wire 3 is welded, the position of the automatic welding of the string welding machine is set on the line between the first connecting line 102 and the second connecting line 103. Due to various reasons, the welding position of the string welding machine will have a slight deviation when welding. As shown in the figure, the deviation of the string welding machine is left-biased and right-biased. Among them, the welding wire 3 in the middle of the figure is not offset, and the welding wire 3 is in the middle. The welding wire 3 can contact the first connecting line 102 and the second connecting line 103 at the same time, and the output power of the battery can be maximized. The welding wire 3 on the left is in a state of being biased to the right. In this case, the welding wire 3 is only connected to the first connecting line 102, and the welding wire 3 on the right is in a state of being biased to the left. In this case, the welding wire 3 is only connected to the second connecting line 103. Although the welding wire 3 can only be connected to the first connecting line 102 and the second connecting line 103 when it is biased to the left or right, compared with the commonly used situation where the first connecting line 102 and the second connecting line 103 are in the same straight line, the welding wire 3 is biased to the left or right and can only contact the square point 101 while the main grid line 1 is completely out of contact, which can greatly improve the output power of the battery pack after welding.

[0026] The grid line electrode of this embodiment can be applied to solar cells with sizes of 210mm*105mm, 182mm*182mm, 210mm*182mm, 182mm*91mm, and thickness of 100 microns to 140 microns. It can be applied to the front and back electrode designs of different solar technology cells such as PERC, TOPCon, and HJT. The number of main grid lines 1 and auxiliary grid lines 2 is determined according to the size, such as the main grid lines 1 of a 210mm*105mm solar cell can be 12-20, and the number of auxiliary grid lines 2 is 50-65.

[0027] In this embodiment, the composition and size of the main grid line 1 and the auxiliary grid line 2 are limited. Among them, the width of the square point 101 is 0.5mm, and the length of the square point 101 is 0.6mm. The spacing between the first connecting line 102 and the second connecting line 103 is 50 microns, and the widths of the first connecting line 102 and the second connecting line 103 are both 20 microns. The width of the auxiliary grid line 2 is 10 microns. The cross-sectional diameter of the welding wire 3 is 0.15mm. After such design, within the offset range of the welding wire 3, there is at least one of the first connecting line 102 or the second connecting line 103, thereby greatly improving the output power of the final finished battery and improving the quality of the final finished product.

[0028] Embodiment 2:

[0029] The solar cell in the present embodiment is provided with a cell sheet for electrode connection, and the grid electrode on the cell sheet is the position where the current inside the battery and the outside of the battery interact. In order to realize the mutual series connection between the batteries, it is necessary to connect them through the welding wire 3. When the welding wire 3 is connected in series, the main grid line 1 along the grid electrode connects different batteries in series. The grid electrode is composed of a horizontal auxiliary grid line 2 and a longitudinal main grid line 1, and the main grid line 1 and the auxiliary grid line 2 are in a state perpendicular to each other. The main grid line 1 is composed of three parts: a square point 101, a first connecting line 102 and a second connecting line 103.

[0030] The square points 101 are located at both ends of the main grid line 1, at the intersection between the main grid line 1 and the main grid line 1, the secondary grid line 2 and the secondary grid line 2, and the main grid line 1 and the secondary grid line 2, that is, between adjacent square points 101 located on the same horizontal straight line is a single secondary grid line 2, between adjacent square points 101 located on the same vertical straight line is a single main grid line 1, and the connection points of adjacent main grid lines 1 share the same square point 101.

[0031] The first connection lines 102 and the second connection lines 103 on the main grid line 1 are arranged in an interlaced manner, that is, if the square point 101 near the top is the first connection line 102, then the first connection line 102 is followed by the second connection line 103, and then the arrangement is changed to the second connection line 103 again, and they are arranged alternately in sequence to form a complete main grid line 1. In addition, the first connection lines 102 and the second connection lines 103 on the main grid line 1 are not connected end to end, the first connection lines 102 are uniformly on a straight line, and the second connection lines 103 are on another straight line. The total number of the first connection lines 102 and the second connection lines 103 set in this embodiment is five, and there are five first connection lines 102 and second connection lines 103 constituting a main grid line 1. It can be three first connection lines 102 or two second connection lines 103, or it can be two first connection lines 102 and three second connection lines 103, but all the main grid lines 1 are the same. The number of the first connection lines 102 and the second connection lines 103 in each main grid line 1 can be set according to actual conditions.

[0032] The square point 101 is in the shape of a square, and its center point is located on the secondary grid line 2, and the side lines of the square point 101 are parallel or perpendicular to the secondary grid line 2, and the longer side of the square point 101 is parallel to the secondary grid line 2. The center of the square point 101 and the midline between the first connecting line 102 and the second connecting line 103 are on the same straight line, and the straight line is the position where the welding wire 3 is set to be welded.

[0033] The two ends of the first connecting line 102 and the second connecting line 103 adjacent to each other on the left and right are connected by a secondary grid line 2, and the length and width of all the secondary grid lines 2 are the same, and the width of the first connecting line 102 and the second connecting line 103 is the same, and the length can be set to be the same or different. The final formed grid electrode will be composed of rectangular squares, and two adjacent first connecting lines 102 in the horizontal direction and the upper and lower secondary grid lines 2 connected thereto form a rectangular square, and two adjacent second connecting lines 103 in the horizontal direction and the upper and lower secondary grid lines 2 connected thereto form another rectangular square. On the same horizontal plane, the same rectangular square is connected end to end, and in the vertical direction, two different rectangular squares are staggered, and the four corners of the two rectangular squares are not connected, showing a staggered shape. The two rectangular squares at the edge of the grid electrode are cut off by the edge line to form rectangular squares of different sizes. Since the first connection lines 102 and the second connection lines 103 may be the same or different, the two rectangular grids are rectangles with the same length but the same or different widths, which are determined according to the relationship between the first connection lines 102 and the second connection lines 103 .

[0034] like Figure 2As shown, when the battery is processed and packaged to form a component, the welding is automatically arranged by the string welding machine, and the interconnection between the batteries is realized by the welding wire 3. When the welding wire 3 is welded, the position of the automatic welding of the string welding machine is set on the line between the first connecting line 102 and the second connecting line 103. Due to various reasons, the welding position of the string welding machine will have a slight deviation when welding. As shown in the figure, the deviation of the string welding machine is left-biased and right-biased. Among them, the welding wire 3 in the middle of the figure is not offset, and the welding wire 3 is in the middle. The welding wire 3 can contact the first connecting line 102 and the second connecting line 103 at the same time, and the output power of the battery can be maximized. The welding wire 3 on the left is in a state of being biased to the right. In this case, the welding wire 3 is only connected to the first connecting line 102, and the welding wire 3 on the right is in a state of being biased to the left. In this case, the welding wire 3 is only connected to the second connecting line 103. Although the welding wire 3 can only be connected to the first connecting line 102 and the second connecting line 103 when it is biased to the left or right, compared with the commonly used situation where the first connecting line 102 and the second connecting line 103 are in the same straight line, the welding wire 3 is biased to the left or right and can only contact the square point 101 while the main grid line 1 is completely out of contact, which can greatly improve the output power of the battery pack after welding.

[0035] The grid line electrode of this embodiment can be applied to solar cells with sizes of 210mm*105mm, 182mm*182mm, 210mm*182mm, 182mm*91mm, and thickness of 100 microns to 140 microns. It can be applied to the front and back electrode designs of different solar technology cells such as PERC, TOPCon, and HJT. The number of main grid lines 1 and auxiliary grid lines 2 is determined according to the size, such as the main grid lines 1 of a 210mm*105mm solar cell can be 12-20, and the number of auxiliary grid lines 2 is 50-65.

[0036] In this embodiment, the composition and size of the main grid line 1 and the auxiliary grid line 2 are limited. Among them, the width of the square point 101 is 0.75mm, and the length of the square point 101 is 1.05mm. The spacing between the first connecting line 102 and the second connecting line 103 is 100 microns, and the widths of the first connecting line 102 and the second connecting line 103 are both 40 microns. The width of the auxiliary grid line 2 is 30 microns. The cross-sectional diameter of the welding wire 3 is 0.225mm. After such design, within the offset range of the welding wire 3, there is at least one of the first connecting line 102 or the second connecting line 103, thereby greatly improving the output power of the final finished battery and improving the quality of the final finished product.

[0037] Embodiment three:

[0038] The solar cell in the present embodiment is provided with a cell sheet for electrode connection, and the grid electrode on the cell sheet is the position where the current inside the battery and the outside of the battery interact. In order to realize the mutual series connection between the batteries, it is necessary to connect them through the welding wire 3. When the welding wire 3 is connected in series, the main grid line 1 along the grid electrode connects different batteries in series. The grid electrode is composed of a horizontal auxiliary grid line 2 and a longitudinal main grid line 1, and the main grid line 1 and the auxiliary grid line 2 are in a state perpendicular to each other. The main grid line 1 is composed of three parts: a square point 101, a first connecting line 102 and a second connecting line 103.

[0039] The square points 101 are located at both ends of the main grid line 1, at the intersection between the main grid line 1 and the main grid line 1, the secondary grid line 2 and the secondary grid line 2, and the main grid line 1 and the secondary grid line 2, that is, between adjacent square points 101 located on the same horizontal straight line is a single secondary grid line 2, between adjacent square points 101 located on the same vertical straight line is a single main grid line 1, and the connection points of adjacent main grid lines 1 share the same square point 101.

[0040] The first connection lines 102 and the second connection lines 103 on the main grid line 1 are arranged in an interlaced manner, that is, if the square point 101 near the top is the first connection line 102, then the first connection line 102 is followed by the second connection line 103, and then the arrangement is changed to the second connection line 103 again, and they are arranged alternately in sequence to form a complete main grid line 1. In addition, the first connection lines 102 and the second connection lines 103 on the main grid line 1 are not connected end to end, the first connection lines 102 are uniformly on a straight line, and the second connection lines 103 are on another straight line. The total number of the first connection lines 102 and the second connection lines 103 set in this embodiment is five, and there are five first connection lines 102 and second connection lines 103 constituting a main grid line 1. It can be three first connection lines 102 or two second connection lines 103, or it can be two first connection lines 102 and three second connection lines 103, but all the main grid lines 1 are the same. The number of the first connection lines 102 and the second connection lines 103 in each main grid line 1 can be set according to actual conditions.

[0041] The square point 101 is in the shape of a square, and its center point is located on the secondary grid line 2, and the side lines of the square point 101 are parallel or perpendicular to the secondary grid line 2, and the longer side of the square point 101 is parallel to the secondary grid line 2. The center of the square point 101 and the midline between the first connecting line 102 and the second connecting line 103 are on the same straight line, and the straight line is the position where the welding wire 3 is set to be welded.

[0042] The two ends of the first connecting line 102 and the second connecting line 103 adjacent to each other on the left and right are connected by a secondary grid line 2, and the length and width of all the secondary grid lines 2 are the same, and the width of the first connecting line 102 and the second connecting line 103 is the same, and the length can be set to be the same or different. The final formed grid electrode will be composed of rectangular squares, and two adjacent first connecting lines 102 in the horizontal direction and the upper and lower secondary grid lines 2 connected thereto form a rectangular square, and two adjacent second connecting lines 103 in the horizontal direction and the upper and lower secondary grid lines 2 connected thereto form another rectangular square. On the same horizontal plane, the same rectangular square is connected end to end, and in the vertical direction, two different rectangular squares are staggered, and the four corners of the two rectangular squares are not connected, showing a staggered shape. The two rectangular squares at the edge of the grid electrode are cut off by the edge line to form rectangular squares of different sizes. Since the first connection lines 102 and the second connection lines 103 may be the same or different, the two rectangular grids are rectangles with the same length but the same or different widths, which are determined according to the relationship between the first connection lines 102 and the second connection lines 103 .

[0043] like Figure 2 As shown, when the battery is processed and packaged to form a component, the welding is automatically arranged by the string welding machine, and the interconnection between the batteries is realized by the welding wire 3. When the welding wire 3 is welded, the position of the automatic welding of the string welding machine is set on the line between the first connecting line 102 and the second connecting line 103. Due to various reasons, the welding position of the string welding machine will have a slight deviation when welding. As shown in the figure, the deviation of the string welding machine is left-biased and right-biased. Among them, the welding wire 3 in the middle of the figure is not offset, and the welding wire 3 is in the middle. The welding wire 3 can contact the first connecting line 102 and the second connecting line 103 at the same time, and the output power of the battery can be maximized. The welding wire 3 on the left is in a state of being biased to the right. In this case, the welding wire 3 is only connected to the first connecting line 102, and the welding wire 3 on the right is in a state of being biased to the left. In this case, the welding wire 3 is only connected to the second connecting line 103. Although the welding wire 3 can only be connected to the first connecting line 102 and the second connecting line 103 when it is biased to the left or right, compared with the commonly used situation where the first connecting line 102 and the second connecting line 103 are in the same straight line, the welding wire 3 is biased to the left or right and can only contact the square point 101 while the main grid line 1 is completely out of contact, which can greatly improve the output power of the battery pack after welding.

[0044] The grid line electrode of this embodiment can be applied to solar cells with sizes of 210mm*105mm, 182mm*182mm, 210mm*182mm, 182mm*91mm, and thickness of 100 microns to 140 microns. It can be applied to the front and back electrode designs of different solar technology cells such as PERC, TOPCon, and HJT. The number of main grid lines 1 and auxiliary grid lines 2 is determined according to the size, such as the main grid lines 1 of a 210mm*105mm solar cell can be 12-20, and the number of auxiliary grid lines 2 is 50-65.

[0045] In this embodiment, the composition and size of the main grid line 1 and the auxiliary grid line 2 are limited. Among them, the width of the square point 101 is 1.0mm, and the length of the square point 101 is 1.5mm. The spacing between the first connecting line 102 and the second connecting line 103 is 150 microns, and the widths of the first connecting line 102 and the second connecting line 103 are both 60 microns. The width of the auxiliary grid line 2 is 50 microns. The cross-sectional diameter of the welding wire 3 is 0.3mm. After such design, within the offset range of the welding wire 3, there is at least one of the first connecting line 102 or the second connecting line 103, thereby greatly improving the output power of the final finished battery and improving the quality of the final finished product.

[0046] The comparison results of the batteries made according to the method in the above embodiment are shown in the following table:

[0047] No improved battery Embodiment 1 Embodiment 2 Embodiment 3 Percentage of cold solder joints 3% 0.9% 0.85% 0.84%

[0048] As shown in the table above, the quality of battery products improved by this solution has been greatly enhanced.

[0049] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A solar cell electrode, comprising a cell sheet, characterized in that: The surface of the battery cell is provided with a grid line electrode that forms an ohmic contact therewith, and the grid line electrode includes a plurality of main grid lines and a plurality of auxiliary grid lines that are perpendicular to each other, and each of the main grid lines is provided with square points at both ends, and each of the main grid lines includes a plurality of first connecting lines and a plurality of second connecting lines that are arranged in an alternating manner.

2. A solar cell electrode according to claim 1, characterized in that: The middle position between the first connecting line and the second connecting line is on the same straight line as the center position of the square point.

3. A solar cell electrode according to claim 2, characterized in that: The distance between the first connecting line and the second connecting line is 50-150 micrometers.

4. A solar cell electrode according to claim 3, characterized in that: The width of the square dots is 0.5-1.0 mm, and the length of the square dots is 0.6-1.5 mm.

5. A solar cell electrode according to claim 4, characterized in that: A welding wire is provided between the first connecting wire and the second connecting wire.

6. A solar cell electrode according to claim 5, characterized in that: The cross-sectional diameter of the welding wire is 0.15-0.3 mm.

7. A solar cell electrode according to claim 1 or 2 or 3 or 4 or 5, characterized in that: The secondary grid lines are line segments with a width of 10 to 50 microns and arranged at equal or unequal intervals.

8. A solar cell electrode according to claim 1 or 2 or 3 or 4 or 5, characterized in that: The width of the first connecting line and the second connecting line are both 20 to 60 micrometers.

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