Laser processing device and method for crystalline silicon solar cell

Abstract

The invention provides a laser processing device for a crystalline silicon solar cell, which comprises at least two groups of power-up roll shaft assemblies arranged at intervals along a first direction, and each power-up roll shaft assembly comprises an upper roll shaft and a lower roll shaft which are arranged along a height direction, the upper roll shaft and the lower roll shaft are respectively connected to a positive electrode and a negative electrode of a power supply so as to apply reverse voltage to the battery piece; and the laser assembly is used for emitting laser between the two groups of power-up roll shaft assemblies. The invention further provides a laser processing method of the crystalline silicon solar cell. According to the invention, the reverse voltage is applied to the solar cell through the power-up roll shaft assembly, and the solar cell can be driven to move at the same time, so that the whole cell is scanned by the laser, the laser is kept fixed, an expensive scanning assembly is not needed, and the productivity can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing crystalline silicon solar cell wafers, and particularly to a laser processing device and method for crystalline silicon solar cell wafers. Background Art

[0002] The contact resistance between the grid line electrodes of a crystalline silicon solar cell wafer and the wafer has a great influence on the fill factor and conversion efficiency. The lower the contact resistance, the higher the corresponding fill factor and conversion efficiency. Currently, the grid line electrodes are commonly printed on the surface of the wafer by screen printing and then sintered at high temperature to form a good ohmic contact. However, the metallization process of the electrode material and the new multi-layer passivation film technology have strict requirements for the sintering process, especially for the problems of ultra-thin tunneling oxide layer and doped polysilicon layer. In view of this, the preparation of the grid line electrodes of crystalline silicon solar cell wafers needs to be improved. Summary of the Invention

[0003] To achieve the above object, the present invention provides a laser processing device for a crystalline silicon solar cell wafer, which includes at least two sets of energized roller shaft assemblies arranged at intervals along a first direction. Each energized roller shaft assembly includes an upper roller shaft and a lower roller shaft arranged along the height direction. The upper roller shaft and the lower roller shaft are respectively connected to the positive electrode and the negative electrode of a power supply to apply a reverse voltage to the wafer; a laser assembly for emitting laser light between the two sets of energized roller shaft assemblies.

[0004] As a further improvement of the present invention, the upper roller shaft includes an upper rotating shaft and a plurality of first electrode rings arranged at intervals on the upper rotating shaft. The lower roller shaft includes a lower rotating shaft and a plurality of second electrode rings arranged at intervals on the lower rotating shaft. The first electrode rings and the second electrode rings are respectively connected to the positive electrode and the negative electrode of the power supply, and the first electrode rings and the second electrode rings contact the wafer to apply a reverse voltage to the wafer.

[0005] As a further improvement of the present invention, the first electrode rings and the second electrode rings are symmetrically arranged along the midline of the height direction of the energized roller shaft assembly.

[0006] As a further improvement of the present invention, the upper rotating shaft and the lower rotating shaft are insulating shafts, and in the direction from one end of the upper rotating shaft to the other end,

[0007] the (2N - 1)th of the first electrode rings and the 2Nth of the second electrode rings are respectively connected to the positive electrode and the negative electrode of the power supply to apply a reverse voltage to the wafer;

[0008] or, the 2Nth of the first electrode rings and the (2N - 1)th of the second electrode rings are respectively connected to the positive electrode and the negative electrode of the power supply to apply a reverse voltage to the wafer;

[0009] wherein, N is a positive integer.

[0010] As a further improvement of the present invention, the upper rotating shaft and the lower rotating shaft are insulating shafts, and the electrifying roller shaft assembly further includes insulating rings, which are located between two adjacent first electrode rings and between two adjacent second electrode rings, and the insulating rings on the upper roller shaft are aligned with the second electrode rings in the height direction.

[0011] As a further improvement of the present invention, the number of the first electrode rings and the second electrode rings is 2 to 60, and the materials of the first electrode rings and the second electrode rings are conductive silicone rubber, conductive sponge, copper sheet, silver-plated copper sheet, silver-plated conductive silicone rubber, and silver-plated rubber.

[0012] As a further improvement of the present invention, the laser is a strip laser spot.

[0013] As a further improvement of the present invention, the strip laser spot extends along a second direction perpendicular to the first direction, the wavelength range of the strip laser spot is 500 to 1200 nm, the size of the strip laser spot along the first direction is 0.01 to 10 mm, and the length of the strip laser spot along the second direction is not less than the length of the battery cell along the second direction, and the power of the laser assembly is 10 to 500 W.

[0014] As a further improvement of the present invention, it further includes a furnace body located upstream of the electrifying roller shaft assembly, and a transmission assembly for conveying the battery cells sintered in the furnace body to the electrifying roller shaft assembly.

[0015] As a further improvement of the present invention, it further includes a temperature control fan located between the furnace body and the electrifying roller shaft assembly; and / or a photodetector located between the furnace body and the electrifying roller shaft assembly.

[0016] The present invention also provides a laser processing method for crystalline silicon solar cells, which includes the following steps:

[0017] Turn on the power supply, and apply a reverse voltage to the battery cells located between the upper roller shaft and the lower roller shaft;

[0018] Turn on the laser assembly to emit laser light;

[0019] The battery cells pass through the radiation area of the laser and generate induced current.

[0020] As a further improvement of the present invention, keep the extending direction of the main grid line of the battery cell consistent with the first direction, and the laser is a strip laser spot, and the strip laser spot extends along a second direction perpendicular to the first direction.

[0021] Advantages of the present invention: While applying a reverse voltage to the solar cell by the powered roller shaft assembly, the present invention can drive the solar cell to move, thereby completing the laser scanning of the entire solar cell. The laser remains fixed, eliminating the need for an expensive scanning assembly and effectively improving production capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings described herein are used to provide a further understanding of the present invention and form a part of the present invention. The illustrative embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0023] Figure 1 is a schematic diagram of the overall structure of the laser processing device of the present invention;

[0024] Figure 2 is a schematic diagram of another perspective of the laser processing device of the present invention;

[0025] Figure 3 is a schematic diagram of the structure of the powered roller shaft assembly of the present invention;

[0026] Figure 4 is a schematic diagram of the connection mode of the powered roller shaft assembly 1 of the present invention to the positive and negative poles of the power supply;

[0027] Figure 5 is a schematic diagram of another connection mode of the powered roller shaft assembly of the present invention to the positive and negative poles of the power supply;

[0028] Figure 6 is a schematic diagram of the connection mode of the powered roller shaft assembly with an insulating ring of the present invention to the positive and negative poles of the power supply. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the specific embodiments and corresponding drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0030] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0032] In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the communication inside two elements. It can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0033] As Figures 1 to 6 shown, it is a laser processing device for a crystalline silicon solar cell of the present invention. The present invention defines the moving direction of the solar cell as the first direction, and the direction perpendicular to the moving direction of the solar cell as the second direction. It includes a power supply roller shaft assembly 100 and a laser assembly 200.

[0034] Among them, the power supply roller shaft assembly 100 is arranged at intervals along the first direction, and while applying a reverse voltage to the solar cell, it can drive the solar cell to move along the first direction. Preferably, the number of the power supply roller shaft assemblies 100 is two groups.

[0035] The power supply roller shaft assembly 100 includes an upper roller shaft 101 and a lower roller shaft 102 arranged along the height direction. The solar cell is located between the upper roller shaft 101 and the lower roller shaft 102. The upper roller shaft 101 and the lower roller shaft 102 can be driven to rotate by an external device such as a motor (not shown in the figure), so as to drive the solar cell to move along the first direction. The upper roller shaft 101 contacts the upper surface of the solar cell, and the lower roller shaft 102 contacts the lower surface of the solar cell. The upper roller shaft 101 and the lower roller shaft 102 are respectively connected to the positive electrode and the negative electrode of the power supply to apply a reverse voltage to the solar cell.

[0036] Further, the upper roller shaft 101 includes an upper rotating shaft 101a and a plurality of first electrode rings 101b spaced apart on the upper rotating shaft 101a. The lower roller shaft 102 includes a lower rotating shaft 102a and a plurality of second electrode rings 102b spaced apart on the lower rotating shaft 102a. The plurality of first electrode rings 101b on the upper roller shaft 101 and the plurality of second electrode rings 102b on the lower roller shaft 102 are in contact with the solar cell and apply a reverse voltage to the solar cell, so that the current generated by laser radiation is evenly distributed to the main grid lines of the solar cell, effectively reducing the risk of damage to the solar cell caused by high current breakdown. The upper rotating shaft 101a and the lower rotating shaft 102a can be respectively connected to the positive and negative electrodes of a power supply; or the first electrode ring 101b and the second electrode ring 102b can be directly connected to the positive and negative electrodes of the power supply.

[0037] Preferably, the first electrode rings 101b and the second electrode rings 102b are symmetrically arranged along the midline in the height direction of the energized roller shaft assembly 100, that is, the number of the first electrode rings 101b and the second electrode rings 102b is the same and they are aligned in the height direction, so that the solar cell is evenly stressed up and down when moving. The first electrode rings 101b and the second electrode rings 102b simultaneously provide driving force and supporting force for the solar cell at the corresponding positions on the front and back surfaces of the solar cell, thus avoiding deformation or breakage of the solar cell caused by uneven stress.

[0038] In this embodiment, the number of the first electrode rings 101b and the second electrode rings 102b is 2 - 60, preferably 8 - 12. The width of a single electrode ring in the second direction is 1 - 100 mm, preferably 3 - 15 mm. The number and width of the first electrode rings 101b and the second electrode rings 102b can be specifically determined according to the number of main grid lines on the solar cell.

[0039] The materials of the first electrode rings 101b and the second electrode rings 102b can be selected from conductive silicone rubber, conductive sponge, copper sheet, silver-plated copper sheet, silver-plated conductive silicone rubber, and silver-plated rubber. Preferably, it is conductive silicone rubber, which has good conductive stability, stable contact with the solar cell, and can effectively prevent scratching the solar cell.

[0040] The laser assembly 200 is used to emit laser between the two groups of energized roller shaft assemblies 100. The laser irradiates on the solar cell with a reverse voltage applied. The laser has a certain radiation area, and an induced current will be generated in the area where the battery cell passes through the radiation area of the laser. When flowing through the area with a relatively high contact resistance, a relatively high temperature will be generated, playing a role similar to sintering, thereby reducing the contact resistance.

[0041] In this embodiment, the laser assembly 200 is located above the electrifying roller shaft assembly 100. Of course, in other embodiments, it can also be arranged below the electrifying roller shaft assembly 100.

[0042] Preferably, the laser is a strip-shaped laser spot, the strip-shaped laser spot extends along a second direction perpendicular to the first direction, and the length of the strip-shaped laser spot along the second direction is not less than the length of the solar cell along the second direction. In this way, when the extending direction of the main grid line of the solar cell is kept consistent with the first direction, the induced current generated by the radiation of the strip-shaped laser spot can be evenly shunted to each main grid line, and the radiation range of a single scan of the strip-shaped laser spot can cover the entire surface of the solar cell.

[0043] The laser assembly 200 only includes a laser source for emitting laser; a shaping assembly for shaping the laser into a strip-shaped laser spot. The laser assembly 200 is located above two groups of the electrifying roller shaft assemblies 100, and the distance between the two groups of the electrifying roller shaft assemblies 100 is less than the length of the solar cell along the first direction, so as to ensure that the solar cell is always in a state of being applied with a reverse voltage during the process of being scanned by the strip-shaped laser spot.

[0044] In this embodiment, the power of the laser assembly 200 is 10 - 500 W, the wavelength range of the strip-shaped laser spot is 500 - 1200 nm, and the size along the first direction is 0.01 - 10 mm.

[0045] While providing a reverse voltage to the solar cell through the first electrode ring 101b and the second electrode ring 102b on the electrifying roller shaft assembly 100, the electrifying roller shaft assembly 100 drives the solar cell to move towards the laser assembly 200. When the strip-shaped laser spot generated by the laser assembly 200 irradiates on the solar cell, an induced current will be generated in the area irradiated by the strip-shaped laser spot. The induced current converges to the main grid line along the fine grid line. At the position where the contact resistance is relatively high, higher heat will be released and the temperature will rise rapidly. After the grid line undergoes an effect similar to sintering, the contact resistance can be effectively reduced. The electrifying roller shaft assembly 100 simultaneously drives the solar cell to move along the first direction, thereby realizing the scanning of the strip-shaped laser spot on the solar cell.

[0046] Keep the position of the strip-shaped laser spot fixed, and complete the scanning of the entire solar cell by the movement of the solar cell. There is no need for an expensive scanning component, i.e., a galvanometer system, which saves costs; during the transmission of the solar cell, secondary sintering is carried out through the strip-shaped laser spot, with high scanning accuracy and no impact on the original production and processing rhythm and production capacity.

[0047] The inventor also found that, due to the small spacing between the upper roller shaft 101 and the lower roller shaft 102, if there is no solar cell between them when powered on, miscontact may occur, leading to a short circuit. To avoid this situation, the present invention adopts but is not limited to the following solutions:

[0048] Referring to Figure 4 and Figure 5 , in one type of embodiment, the upper rotating shaft 101a and the lower rotating shaft 102a are made of insulating shafts, and voltages are applied to the first electrode ring 101b and the second electrode ring 102b at intervals.

[0049] Referring to Figure 4 , from left to right, the (2N - 1)th in the first electrode ring 101b and the 2Nth in the second electrode ring 102b are respectively connected to the positive and negative electrodes of the power supply to apply a reverse voltage to the battery cell, that is, the odd-numbered ones in the first electrode ring 101b are connected to the positive or negative electrode of the power supply, and the even-numbered ones in the second electrode ring 102b are connected to the negative or positive electrode of the power supply, so that the first electrode ring 101b and the second electrode ring 102b connected to both ends of the power supply are misaligned with each other, thereby preventing short circuits caused by miscontact between the first electrode ring 101b and the second electrode ring 102b.

[0050] Referring to Figure 5 , from left to right, the 2Nth in the first electrode ring 101b and the (2N - 1)th in the second electrode ring 102b are respectively connected to the positive and negative electrodes of the power supply to apply a reverse voltage to the battery cell, that is, the even-numbered ones in the first electrode ring 101b are connected to the positive or negative electrode of the power supply, and the odd-numbered ones in the second electrode ring 102b are connected to the negative or positive electrode of the power supply, so that the first electrode ring 101b and the second electrode ring 102b connected to both ends of the power supply are misaligned with each other, thereby preventing short circuits caused by miscontact between the first electrode ring 101b and the second electrode ring 102b.

[0051] Referring to Figure 6, in another type of embodiments, the upper rotating shaft 101a and the lower rotating shaft 102a are made of insulating shafts. The energizing roller shaft assembly 100 further includes insulating rings 103 (the shaded parts in the figure are insulating rings 103). The insulating rings 103 are located between two adjacent first electrode rings 101b and between two adjacent second electrode rings 102b. The insulating rings 103 on the upper roller shaft 101 are aligned with the second electrode rings 102b in the height direction, and the insulating rings 103 on the lower roller shaft 101 are aligned with the first electrode rings 101b in the height direction. In this way, the first electrode rings 101b and the second electrode rings 102b are offset from each other in the up-and-down positions, thereby preventing the first electrode rings 101b and the second electrode rings 102b from accidentally contacting and causing a short circuit. Moreover, by providing the insulating rings 103 to cooperate with the first electrode rings 101b or the second electrode rings 102b, it is ensured that the solar cell is evenly stressed in the up-and-down direction during movement, avoiding deformation or breakage of the solar cell caused by uneven stress.

[0052] Further, the laser processing device further includes a furnace body 300, a transmission assembly 400, a temperature control fan 500, and a photodetector 600.

[0053] Among them, the furnace body 300 uses an existing sintering furnace or light injection furnace, which is used for sintering the solar cell that has completed screen printing. Heating lamps for simultaneously heating the front and back surfaces of the solar cell are provided in the furnace body 300.

[0054] The transmission assembly 400 extends along the first direction and is used for conveying the solar cell. The transmission assembly 400 includes a connected first transmission section and a second transmission section. The first transmission section is used for transmitting the solar cell to be sintered into the furnace body 300, and the second transmission section is used for transmitting the sintered solar cell to the laser assembly 200. The strip-shaped laser spot emitted by the laser assembly 200 performs secondary sintering on the solar cell.

[0055] Further, the transmission assembly 400 can adopt transmission roller wheels to drive the solar cell to move along the first direction.

[0056] The transmission roller wheels are arranged at intervals along the first direction. The distance between two adjacent groups of the transmission roller wheels is preferably one-half of the length of the solar cell along the first direction, minimizing the contact area with the solar cell while ensuring transmission stability. The transmission roller wheels can be integrally formed or split roller wheels. Preferably, split roller wheels are used. The middle of the split roller wheels is disconnected. The solar cell only contacts the transmission roller wheels at both ends along the second direction, thereby minimizing the contact area between the transmission roller wheels and the solar cell to the greatest extent, and the solar cell can directly receive the heat transferred by the heating lamps.

[0057] The temperature-controlled fan 500 is located outside the furnace body 300 and is used to cool the solar cell after sintering, so as to prevent the solar cell from being overheated and burned due to excessive temperature after being irradiated by the subsequent strip laser spot. The wind speed of the temperature-controlled fan 500 is adjustable to control the temperature of the solar cell.

[0058] The photodetector 600 is located between the temperature-controlled fan 500 and the energized roller shaft assembly 100 and is used to obtain the position of the solar cell. When the solar cell is conveyed to the position where the photodetector 600 is located, the laser assembly 200 is turned on.

[0059] The present invention also provides a laser processing method for crystalline silicon solar cells. Taking N-type solar cells as an example, the method includes the following steps:

[0060] Place the front side of the crystalline silicon solar cell after screen printing face up on the first transmission section of the transmission assembly 400, and keep the extending direction of the main grid line of the solar cell consistent with the transmission direction. The solar cell is conveyed into the furnace body 300 through the first transmission section;

[0061] The solar cell passes through the sintering area in the furnace body 300, and the sintering area heats the front and back sides of the solar cell by lamps to complete high-temperature sintering;

[0062] The solar cell after sintering is conveyed to the temperature control area where the temperature-controlled fan 500 is located through the second transmission section to cool the solar cell;

[0063] The cooled solar cell continues to be conveyed to the position where the photodetector 600 is located. When the photodetector 600 detects the solar cell, the laser assembly 200 is turned on. Connect the first electrode ring 101b on the upper roller shaft 101 to the negative pole of the power supply, and connect the second electrode ring 102b on the lower roller shaft 102 to the positive pole of the power supply;

[0064] The solar cell continues to be conveyed to the position of the first group of the energized roller shaft assemblies 100. The solar cell enters between the upper roller shaft 101 and the lower roller shaft 102. The first electrode ring 101b and the second electrode ring 102b apply a reverse voltage to the solar cell, and the voltage value is 5-25V. Driven by the energized roller shaft assembly 100, the solar cell continues to move;

[0065] When the solar cell passes through the radiation area of the strip-shaped laser spot, an induced current is generated in the area irradiated by the strip-shaped laser spot on the solar cell. The induced current converges along the fine grid lines to the main grid line. At positions with relatively high contact resistance, higher heat will be released and the temperature will rise rapidly to complete the secondary sintering.

[0066] The powered roller shaft assembly 100 drives the solar cell to move, and the strip-shaped laser spot performs a scanning radiation on the solar cell until the entire solar cell is scanned. Under the action of the two groups of powered roller shaft assemblies 100, a reverse voltage is always applied to the solar cell during the scanning process, and the cell is kept moving at a constant speed. The transmission speed is 15 - 20 m / min. After the scanning is completed, the latter group of powered roller shaft assemblies 100 transports the cell out of the working area.

[0067] In summary, the present invention can drive the solar cell to move while applying a reverse voltage to the solar cell through the powered roller shaft assembly 100, thereby completing the scanning of the entire solar cell by the strip-shaped laser. The laser spot remains fixed, eliminating the need for an expensive scanning component, saving equipment costs and production line space costs; and through the power connection design of the electrode ring or the insulating ring 103, the contact short circuit of the electrode ring is effectively avoided while applying a reverse voltage to the solar cell.

[0068] Keep the position of the strip-shaped laser spot fixed, and complete the scanning of the entire front surface of the solar cell by the strip-shaped laser spot through the transmission of the cell. The scanning accuracy is high, and it can be consistent with the production rhythm of the production line screen printing without affecting the production capacity.

[0069] It should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0070] The series of detailed descriptions listed above are only specific descriptions of the feasible embodiments of the present invention, and are not used to limit the protection scope of the present invention. Any equivalent embodiments or changes made without departing from the technical spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser processing device for crystalline silicon solar cell wafers, characterized in that, Including: At least two sets of energizing roller shaft assemblies (100) spaced along a first direction, the energizing roller shaft assembly (100) including an upper roller shaft (101) and a lower roller shaft (102) arranged in a height direction, the upper roller shaft (101) and the lower roller shaft (102) being respectively connected to the positive and negative electrodes of a power supply to apply a reverse voltage to a battery cell; A laser assembly (200) for emitting a laser between the two sets of energizing roller shaft assemblies (100).

2. The laser processing device for crystalline silicon solar cell wafers according to claim 1, characterized in that: The upper roller shaft (101) includes an upper rotating shaft (101a) and a plurality of first electrode rings (101b) spaced on the upper rotating shaft (101a), the lower roller shaft (102) includes a lower rotating shaft (102a) and a plurality of second electrode rings (102b) spaced on the lower rotating shaft (102a), the first electrode rings (101b) and the second electrode rings (102b) are respectively connected to the positive and negative electrodes of a power supply, and the first electrode rings (101b) and the second electrode rings (102b) contact the battery cell to apply a reverse voltage to the battery cell.

3. The laser processing device for crystalline silicon solar cell wafers according to claim 2, characterized in that: The first electrode rings (101b) and the second electrode rings (102b) are symmetrically arranged along the midline in the height direction of the energizing roller shaft assembly (100).

4. The laser processing device for crystalline silicon solar cell wafers according to claim 3, characterized in that: The upper rotating shaft (101a) and the lower rotating shaft (102a) are insulating shafts, and in the direction from one end of the upper rotating shaft (101a) to the other end, The (2N - 1)th of the first electrode rings (101b) and the 2Nth of the second electrode rings (102b) are respectively connected to the positive and negative electrodes of a power supply to apply a reverse voltage to the battery cell; Or, the 2Nth of the first electrode rings (101b) and the (2N - 1)th of the second electrode rings (102b) are respectively connected to the positive and negative electrodes of a power supply to apply a reverse voltage to the battery cell; wherein, N is a positive integer.

5. The laser processing device for crystalline silicon solar cell wafers according to claim 2, characterized in that: The upper rotating shaft (101a) and the lower rotating shaft (102a) are insulating shafts, the energizing roller shaft assembly (100) further includes insulating rings (103), the insulating rings (103) are located between two adjacent first electrode rings (101b) and between two adjacent second electrode rings (102b), and the insulating rings (103) on the upper roller shaft (101) are aligned with the second electrode rings (102b) in the height direction.

6. The laser processing device for crystalline silicon solar cell wafers according to claim 2, characterized in that: The number of the first electrode rings (101b) and the second electrode rings (102b) is 2 to 60, and the materials of the first electrode rings (101b) and the second electrode rings (102b) are conductive silicone rubber, conductive sponge, copper sheet, silver-plated copper sheet, silver-plated conductive silicone rubber or silver-plated rubber.

7. The laser processing device for crystalline silicon solar cell wafers according to claim 1, wherein: The laser is a strip-shaped laser spot.

8. The laser processing device for crystalline silicon solar cell wafers according to claim 7, wherein: The strip-shaped laser spot extends along a second direction perpendicular to the first direction, the wavelength range of the strip-shaped laser spot is 500-1200 nm, the size of the strip-shaped laser spot along the first direction is 0.01-10 mm, and the length of the strip-shaped laser spot along the second direction is not less than the length of the battery cell along the second direction. The power of the laser assembly (200) is 10-500 W.

9. The laser processing device for crystalline silicon solar cell wafers according to claim 1, wherein: It further includes a furnace body (300) located upstream of the energized roller shaft assembly (100), and a transmission assembly (400) for conveying the battery cell sintered in the furnace body (300) to the energized roller shaft assembly (100).

10. The laser processing device for crystalline silicon solar cell wafers according to claim 9, characterized in that: It further includes a temperature control fan (500) located between the furnace body (300) and the energized roller shaft assembly (100); and / or a photodetector (600) located between the furnace body (300) and the energized roller shaft assembly (100).

11. A method for a laser processing device of a crystalline silicon solar cell sheet adopting any one of claims 1-10, characterized in that, It includes the following steps: Turn on the power supply and apply a reverse voltage to the battery cell located between the upper roller shaft (101) and the lower roller shaft (102). Turn on the laser assembly (200) to emit laser light. The battery cell passes through the radiation area of the laser and generates an induced current.

12. The laser processing method according to claim 11, characterized in that: Keep the extending direction of the main grid line of the battery cell consistent with the first direction, and the laser is a strip-shaped laser spot, and the strip-shaped laser spot extends along a second direction perpendicular to the first direction.

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