CN112864276A - Nondestructive cutting method and device for photovoltaic cell - Google Patents
Nondestructive cutting method and device for photovoltaic cell Download PDFInfo
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- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
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- H01L21/302—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/20 - H01L21/26 to change their surface-physical characteristics or shape, e.g. etching, polishing, cutting
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Abstract
The invention provides a nondestructive cutting method for a photovoltaic cell, which can solve the problem of low cutting quality caused by non-coincident grooving and thermal cracking laser cutting paths in the conventional nondestructive cutting application of the photovoltaic cell. Firstly, debugging a laser cutting device, and setting a slotting laser generator and a thermal cracking laser generator into laser beams which are simultaneously emitted to the surface of a photovoltaic cell piece, so that the two laser beams can just intersect on the surface of the photovoltaic cell piece and form coincident and concentric laser spots; the control system controls the debugged laser cutting device to move along a cutting scanning path S of the photovoltaic cell, controls the slotted laser generator and the thermal cracking laser generator to be simultaneously opened in the moving process along a head-end slotted thermal cracking path S1 and the moving process along a tail-end slotted thermal cracking path S3, and controls the slotted laser generator to be closed and the thermal cracking laser generator to be opened in the moving process of a middle thermal cracking path S2.
Description
Technical Field
The invention relates to the technical field of photovoltaic cell production and processing, in particular to a photovoltaic cell nondestructive cutting method and a photovoltaic cell nondestructive cutting device.
Background
With the iteration of new technology and the development of large-size battery plates, the power generation cost of global photovoltaic power stations is gradually close to the power generation cost of fossil fuels, and photovoltaic power generation gradually enters the era of flat power generation. In recent years, when large-size battery pieces are cut, the conventional mechanical sheet breaking method adopted in the past is gradually replaced by a laser non-destructive cutting method due to the defects of poor sheet breaking precision, high hidden crack risk, low bending strength, easy occurrence of crystal shedding phenomenon and the like.
The existing laser nondestructive cutting is to focus a beam of pulse laser on the surface of a battery piece, and perform slotting with the length of 0.5-2mm and the depth of 20-50% at the head end and the tail end of a cutting line so as to form stress induction grooves at two ends of the cutting line of the battery piece; and then scanning the battery piece along the cutting line of the battery piece by using a beam of infrared continuous laser, thereby heating the battery piece along the cutting line of the battery piece, so that the temperature of an illuminated area of the battery piece is rapidly increased, when a sufficient temperature gradient is formed, the battery piece is cracked along the laser scanning direction, namely along the cutting line of the battery piece after the stress exceeds a threshold value, and then the battery piece is cut, wherein the process is called a thermal cracking process.
In practical production and application, the above photovoltaic cell laser nondestructive cutting method generally has two cutting modes: the first is a rotating disc type work station, for example, the Chinese patent application with the publication number of CN111558773A, which discloses a nondestructive cutting method of solar cells, the method at least comprises a loading photographing work station, a laser grooving work station, a laser thermal cracking slicing work station and a blanking work station, wherein the laser grooving work station and the laser thermal cracking slicing work station are two mutually independent work stations, and the laser grooving work station is generally used for respectively grooving the head end and the tail end of a cutting line of the cell by combining pulse laser with a vibrating mirror field lens; the laser thermal cracking slicing station scans a cutting line of the cell by using a beam of continuous laser and heats the cell to crack; because the equipment can generate unavoidable vibration in the operation process, when the equipment vibration reaches a certain degree, the center of the thermal cracking laser and/or the center of the slotting laser on the working surface can be directly deviated, and the vibrating mirror can also have a certain degree of temperature drift and zero drift, when the deviation of the thermal cracking laser cutting path and the slotting laser cutting path is +/-30 mu m, the head end and the tail end of the slotting of the cell piece can have obvious radians (see figures 1 and 2) and even the cell piece can not crack, the straight line parts shown in figures 1 and 2 are the head end and the tail end of the photovoltaic cell piece, the deviations of the thermal cracking laser cutting path and the slotting laser cutting path are respectively 42 mu m and 89.5 mu m, and the end parts of the photovoltaic cell piece all have obvious radians; in order to reduce the deviation of the central positions of the two laser spots caused by vibration, the vibration of the whole equipment is generally reduced by prolonging the cutting period of a single battery piece, but the efficiency and the capacity of the whole equipment are reduced by prolonging the cutting period of the single battery piece, but the deviation caused by the drift of the galvanometer cannot be solved.
The other non-destructive splitting mode is linear cutting, and the working mode is that a slotting laser and a thermal cracking laser both output laser vertically downwards through a cutting head, wherein a thermal cracking laser spot on a working surface always lags behind a slotting laser spot by dozens of millimeters or even hundreds of millimeters; the battery piece passes through a grooving laser cutting head at a constant speed in a straight line, and a first groove is opened by opening grooving laser; the battery piece continues to move forwards again to pass through the thermal cracking laser cutting head, and at the moment, the thermal cracking laser is opened to crack the battery piece; when the battery piece continues to operate, the tail end of the battery piece is close to the slotting laser cutting head, and a tail slot is slotted; and the battery piece continues to move forwards until the battery piece completely passes through the thermal cracking laser cutting head, and the thermal cracking laser is turned off, so that one cutting cycle of the battery piece is completed. In this embodiment, since the thermal cracking laser spot always lags behind the grooving laser spot, if the cutting line of the battery piece and the moving direction of the battery piece have a certain angle, the cutting path of the grooving laser does not coincide with the cutting path of the thermal cracking laser, so that a certain offset is generated, and when the offset exceeds 30 μm, the phenomena shown in fig. 1 and 2 also occur.
In conclusion, the two existing photovoltaic cell nondestructive cutting methods have the problem that the quality of the split sheet is low due to the fact that deviation is prone to occur between a slotting laser cutting path and a thermal cracking laser cutting path.
Disclosure of Invention
Aiming at the problems, the invention provides a photovoltaic cell nondestructive cutting method which can solve the problem of low cutting quality caused by grooving and thermal cracking laser cutting path deviation in the conventional photovoltaic cell nondestructive cutting application. Therefore, the invention also provides a special cutting device.
A photovoltaic cell nondestructive cutting method comprises a laser cutting device, wherein the laser cutting device comprises a slotting laser generator and a thermal cracking laser generator, and is characterized in that: which comprises the following steps of,
(1) debugging the laser cutting device: the grooving laser generator and the thermal cracking laser generator are arranged such that two laser beams respectively emitted by the grooving laser generator and the thermal cracking laser generator can simultaneously emit to the surface of the photovoltaic cell piece and the two laser beams can intersect on the surface of the photovoltaic cell piece, so that laser spots of the two laser beams on the surface of the photovoltaic cell piece can form coincident and concentric laser spots;
(2) presetting a photovoltaic cell slice cutting scanning path S according to a photovoltaic cell slice cutting line in a control system, wherein the photovoltaic cell slice cutting scanning path S consists of a head-end slotted hot cracking path S1, a middle hot cracking path S2 and a tail-end slotted hot cracking path S3 which are sequentially continuous;
(3) the control system controls the laser cutting device and the photovoltaic cell slice after debugging in the step (1) to move relatively according to the cutting scanning path S of the photovoltaic cell slice in the step (2), wherein,
in the relative movement process according to the head end slotting heat cracking path S1 and the tail end slotting heat cracking path S3, the control system controls the slotting laser generator and the heat cracking laser generator of the laser cutting device to be simultaneously started, so that two laser beams intersect on the surface of the photovoltaic cell in the two relative movement processes to form concentric coincident laser spots, and simultaneously scan the surface of the photovoltaic cell, and the laser beams of the heat cracking laser generator heat the cell while the laser beams of the slotting laser generator slot the cell;
and in the relative movement process according to the intermediate thermal cracking path S2, the control system controls the opening and closing of a slotted laser generator and the opening of a thermal cracking laser generator of the laser cutting device, and laser beams emitted by the thermal cracking laser generator heat and scan the photovoltaic cell in the relative movement process.
Furthermore, the laser cutting device comprises an installation part, the angle of the slotted laser generator and the angle of the hot-cracked laser generator are adjustably installed on the installation part, the specific operation of the step (1) is to adjust the installation angle of the slotted laser generator and/or the hot-cracked laser generator on the installation part, so that two laser beams just can intersect and form on the surface of the photovoltaic cell, and the laser spots coincide and are concentric.
Furthermore, in the step (1), the grooving laser generator is firstly installed on the installation part and is set to be perpendicular to the surface of the photovoltaic cell piece, then the thermal cracking laser generator is assembled on the installation part and is adjusted to move in the X direction and the Y direction, so that the laser beam of the thermal cracking laser generator and the laser beam of the grooving laser intersect on the surface of the photovoltaic cell piece in an angle manner and form coincident and concentric laser spots.
According to another technical scheme, the laser cutting device comprises a dichroic mirror, the wavelength of the slotted laser generator is different from that of the thermal cracking laser generator, the slotted laser generator and the thermal cracking laser generator are arranged in the step (1) that two beams of laser simultaneously irradiate the dichroic mirror, one beam of laser can penetrate through the dichroic mirror and then irradiate the surface of the photovoltaic cell piece, the other beam of laser is reflected by the dichroic mirror and then irradiates the surface of the photovoltaic cell piece, and the angle of the dichroic mirror is adjusted so that the two beams of laser which are respectively transmitted and reflected by the dichroic mirror can simultaneously irradiate the surface of the photovoltaic cell piece and can intersect on the surface of the photovoltaic cell piece to form coincident and concentric laser spots.
In the step (2) of the method, the length of the head-end slotting thermal cracking path S1 is the length of the head-end slotting of the photovoltaic cell slice cutting line, and the length of the tail-end slotting thermal cracking path S3 is the length of the tail-end slotting of the photovoltaic cell slice cutting line.
The utility model provides a photovoltaic cell piece's harmless cutting device, its includes fluting laser generator, hot crack laser generator and control system, fluting laser generator, hot crack laser generator respectively with control system electric control connects its characterized in that: slotted laser generator, hot crack laser generator install in the installation department just angularly adjustable slotted laser generator's laser beam, hot crack laser generator's laser beam all towards photovoltaic cell piece surface to two bundles of laser beams just in time can intersect and form coincident and endocentric laser facula on photovoltaic cell piece surface, control system can control the installation department that installs angularly adjustable slotted laser generator and hot crack laser generator wholly with between the photovoltaic cell piece according to the photovoltaic cell piece cutting path synchronization relative movement of predetermineeing and at the relative movement in-process control system can control opening and closing of slotted laser generator, hot crack laser generator.
Furthermore, install in the laser beam of the fluting laser generator emission of installation department is perpendicular with photovoltaic cell piece surface, hot crack laser generator with fluting laser generator is angle slope install in on the installation department, and make the laser beam of fluting laser generator with hot crack laser generator's laser beam is that the angle ground intersects at photovoltaic cell piece surface and forms coincident and concentric laser facula on photovoltaic cell piece surface.
The invention relates to a nondestructive cutting device for a photovoltaic cell, which comprises a slotted laser generator, a thermal cracking laser generator and a control system, wherein the slotted laser generator and the thermal cracking laser generator are respectively in electric control connection with the control system, and the nondestructive cutting device is characterized in that: the control system can control the grooving laser generator, the thermal cracking laser generator and the photovoltaic cell to synchronously and relatively move between the whole body of the grooving laser generator, the thermal cracking laser generator and the photovoltaic cell according to a preset photovoltaic cell cutting path, and can control the grooving laser generator and the thermal cracking laser generator to be opened and closed in the relative movement process.
The invention has the beneficial effects that: the grooving laser generator and the thermal cracking laser generator of the laser cutting device are arranged such that two laser beams respectively emitted by the grooving laser generator and the thermal cracking laser generator can simultaneously emit to the surface of a photovoltaic cell piece and the two laser beams can intersect on the surface of the photovoltaic cell piece so that laser spots of the two laser beams on the surface of the photovoltaic cell piece can form coincident and concentric laser spots, when the photovoltaic cell piece is cut, the control system controls the relative movement between the whole laser cutting device and the photovoltaic cell piece according to a preset cutting scanning path S of the photovoltaic cell piece, wherein the control system controls the grooving laser generator and the thermal cracking laser generator to be simultaneously opened in the relative movement process along a head end grooving thermal cracking path S1 and the relative movement process along a tail end grooving thermal cracking path S3, so that the concentric laser spots formed by the two laser beams intersecting and coinciding on the surface of the photovoltaic cell piece in the two relative processes can simultaneously scan the surface of the photovoltaic cell piece, the laser beam of the laser generator is thermally cracked to heat the battery piece while the laser beam of the laser generator is slotted to the battery piece; in the relative movement process along the middle hot cracking path S2, the control system controls the slotted laser generator to be closed and the hot cracking laser generator to be opened, and laser beams emitted by the hot cracking laser generator heat and scan the photovoltaic cell in the process; because the slotted laser generator and the thermal cracking laser generator can intersect and coincide on the surface of the photovoltaic cell to form a concentric laser spot, the situation that the head end and the tail end of the slot of the photovoltaic cell have radians and even can not be cracked due to the deviation of the scanning path of the slotted laser generator and the scanning path of the thermal cracking laser generator in the existing method can be effectively avoided; meanwhile, the photovoltaic cell is subjected to simultaneous slotting and hot cracking in the scanning process of the head-end slotting hot cracking path S1 and the tail-end slotting hot cracking path S3, so that the cutting efficiency can be greatly improved, and the productivity can be improved; in addition, because the two laser beams intersect on the surface of the photovoltaic cell and coincide, the cutting path of the photovoltaic cell is not limited, and the bidirectional splitting of the cell can be realized, so that the cutting efficiency of the photovoltaic cell can be further improved, and the productivity can be improved.
Drawings
FIG. 1 is a first picture of a cutting defect generated by scanning path deviation of grooving laser and thermal cracking laser in a conventional nondestructive cutting process of a photovoltaic cell, which is displayed by an electron microscope;
FIG. 2 is a second picture of a cutting defect generated by scanning path deviation of a slotting laser and a thermal cracking laser in a nondestructive cutting process of a conventional photovoltaic cell, which is displayed by an electron microscope;
FIG. 3 is a schematic diagram of the intersection of the laser beam of a slotted laser generator and the laser beam of a thermal cracking laser generator on the surface of a photovoltaic cell to form coincident and concentric laser spots according to a first embodiment of the method of the present invention;
FIG. 4 is a schematic diagram of the intersection of the laser beam of a slotted laser generator and the laser beam of a thermal cracking laser generator on the surface of a photovoltaic cell to form coincident and concentric laser spots according to a second embodiment of the method of the present invention;
fig. 5 is a schematic diagram of a predetermined cutting path S of a photovoltaic cell sheet in an embodiment of the method of the present invention.
Reference numerals: 1-slotted laser generator, 2-hot-cracked laser generator, 3-photovoltaic cell slice, 4-dichroic mirror and 5-working platform.
Detailed Description
The invention relates to a nondestructive cutting method of a photovoltaic cell, which comprises a laser cutting device, wherein the laser cutting device comprises a slotting laser generator and a thermal cracking laser generator; which comprises the following steps of,
(1) debugging the laser cutting device: the grooving laser generator 1 and the thermal cracking laser generator 2 are arranged such that two laser beams respectively emitted by the grooving laser generator 1 and the thermal cracking laser generator 2 can simultaneously emit to the surface of the photovoltaic cell piece and the two laser beams can intersect on the surface of the photovoltaic cell piece, so that laser spots of the two laser beams on the surface of the photovoltaic cell piece can form coincident and concentric laser spots;
(2) presetting a photovoltaic cell slice cutting scanning path S according to a photovoltaic cell slice cutting line in a control system, wherein the photovoltaic cell slice cutting scanning path S is composed of a head-end slotted hot cracking path S1, a middle hot cracking path S2 and a tail-end slotted hot cracking path S3 which are sequentially continuous;
(3) the control system controls the laser cutting device and the photovoltaic cell slice after debugging in the step (1) to move relatively according to the cutting scanning path S of the photovoltaic cell slice in the step (2); wherein the content of the first and second substances,
in the relative movement process of the head-end grooving hot cracking path S1 and the tail-end grooving hot cracking path S3, the control system controls the grooving laser generator and the hot cracking laser generator of the laser cutting device to be simultaneously started, so that two laser beams intersect on the surface of the photovoltaic cell in the two relative movement processes to form concentric coincident laser spots, the concentric coincident laser spots simultaneously scan the surface of the photovoltaic cell, and the laser beams of the grooving laser generator heat the cell while grooving the laser beams of the grooving laser generator perform grooving on the cell;
and in the relative movement process according to the intermediate thermal cracking path S2, the control system controls the opening and closing of a slotted laser generator and the opening of a thermal cracking laser generator of the laser cutting device, and laser beams emitted by the thermal cracking laser generator heat and scan the photovoltaic cell in the relative movement process.
In practical application, the control system controls the laser cutting device after debugging in the step (1) and the photovoltaic cell slice to move relatively according to the cutting scanning path S of the photovoltaic cell slice in the step (2), and the laser cutting device is relatively fixed, and the working platform 5 bearing the photovoltaic cell slice is driven by the movement driving device to move so as to realize relative movement; the photovoltaic cell piece can also be fixed, and the laser cutting device is driven by the movement driving mechanism to move so as to realize relative movement.
The laser cutting device in the method further comprises an installation part, wherein the angle of the slotted laser generator and the angle of the hot cracking laser generator are adjustably installed on the installation part, and the specific operation of the step (1) is to adjust the installation angle of the slotted laser generator and/or the hot cracking laser generator on the installation part, so that two laser beams can just intersect on the surface of the photovoltaic cell and form the coincident and concentric laser spots.
In a further embodiment, in the step (1), the slotted laser generator 1 is firstly installed on the installation part and is set to be vertical to the laser beam on the surface 3 of the photovoltaic cell, then the thermal cracking laser generator 2 is assembled on the installation part and the thermal cracking laser generator 2 is adjusted to move in the X direction and the Y direction so that the laser beam of the thermal cracking laser generator and the laser beam of the slotted laser intersect on the surface of the photovoltaic cell at an angle and form a superposed and concentric laser spot, which is shown in fig. 3.
According to the other technical scheme of the laser cutting device in the method, the laser cutting device further comprises a dichroic mirror 4, the wavelength of a slotted laser generator is different from that of a hot-cracking laser generator, the specific operation of the step (1) is that the slotted laser generator and the hot-cracking laser generator are set to enable two beams of laser to simultaneously irradiate towards the dichroic mirror, one beam of laser can penetrate through the dichroic mirror and then irradiate towards the surface of a photovoltaic cell piece, the other beam of laser can penetrate through the dichroic mirror and then irradiate towards the surface of the photovoltaic cell piece, and the angle of the dichroic mirror is adjusted to enable the two beams of laser which are respectively transmitted and reflected through the dichroic mirror to simultaneously irradiate towards the surface of the photovoltaic cell piece and can intersect on the surface of the photovoltaic cell piece to form coincident and concentric laser spots; referring to fig. 4, in this embodiment, the slotted laser emitted by the slotted laser generator transmits through the dichroic mirror 4 and then irradiates onto the surface of the photovoltaic cell 3, and the thermal cracking laser emitted by the thermal cracking laser generator is reflected by the dichroic mirror 4 and then irradiates onto the surface of the photovoltaic cell 3.
The dichroic mirror is an optical lens, one surface of which is plated with a dichroic color separation film and the other surface of which is plated with an anti-reflection film, and the dichroic mirror has the function of reflecting light in a certain wavelength range and transmitting light in another wavelength range; in practical application of the method, the slotted laser generator can adopt a fiber laser with the wavelength of 1064nm, the dichroic mirror can only split light with different wavelengths, and the thermal cracking laser can adopt a direct semiconductor laser with the wavelengths of 808nm, 878nm, 915nm and 976 nm.
In the step (2) of the method, the length of the head-end slotting thermal cracking path S1 is the length of the head-end slotting of the photovoltaic cell slice cutting line, and the length of the tail-end slotting thermal cracking path S3 is the length of the tail-end slotting of the photovoltaic cell slice cutting line.
The embodiment of the invention relates to a nondestructive cutting device for a photovoltaic cell, which comprises a slotted laser generator 1, a thermal cracking laser generator 2 and a control system, wherein the slotted laser generator 1 and the thermal cracking laser generator 2 are respectively in electric control connection with the control system; grooving laser generator 1, hot crack laser generator 2 angularly adjustable installs in installation department and grooving laser generator 1's laser beam, hot crack laser generator 2's laser beam all faces photovoltaic cell piece 3 surface, and two bundles of laser beams just in time can intersect and form coincident and concentric laser facula on photovoltaic cell piece surface at photovoltaic cell piece 3 surface, control system can control the installation department that installs angularly adjustable grooving laser generator 1 and hot crack laser generator 2 whole and photovoltaic cell piece between according to the synchronous relative movement of predetermined photovoltaic cell piece cutting route and can control grooving laser generator 1 at relative movement in-process control system, opening and closing of hot crack laser generator 2.
According to the further technical scheme, laser beams emitted by a slotted laser generator 1 installed on the installation part are perpendicular to the surface of a photovoltaic cell piece 3, a thermal cracking laser generator 2 and the slotted laser generator 1 are installed on the installation part in an inclined mode, and the laser beams of the slotted laser generator 1 and the laser beams of the thermal cracking laser generator 2 intersect on the surface of the photovoltaic cell piece in an angle mode to form coincident and concentric laser spots on the surface of the photovoltaic cell piece.
The invention relates to another embodiment of a nondestructive cutting device for a photovoltaic cell, which comprises a slotted laser generator 1, a thermal cracking laser generator 2 and a control system, wherein the slotted laser generator 1 and the thermal cracking laser generator 2 are respectively in electric control connection with the control system; the control system can control the slotted laser generator 1, the hot-cracking laser generator 2, the whole dichroic mirror 4 and the photovoltaic cell to synchronously and relatively move according to a preset photovoltaic cell cutting path, and can control the slotted laser generator 1 and the hot-cracking laser generator 2 to be opened and closed in the relative movement process; in this embodiment, the laser beam emitted by the slotted laser generator 1 transmits through the dichroic mirror 4 and irradiates the surface of the photovoltaic cell 3, and the laser beam emitted by the thermal cracking laser generator 2 is reflected by the dichroic mirror 4 and irradiates the surface of the photovoltaic cell 3.
The detailed description of the embodiments of the present invention is provided above, but the present invention is only the preferred embodiments of the present invention, and should not be considered as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the invention shall fall within the scope of the patent coverage of the present invention.
Claims (8)
1. A photovoltaic cell nondestructive cutting method comprises a laser cutting device, wherein the laser cutting device comprises a slotting laser generator and a thermal cracking laser generator, and is characterized in that: which comprises the following steps of,
(1) debugging the laser cutting device: the grooving laser generator and the thermal cracking laser generator are arranged such that two laser beams respectively emitted by the grooving laser generator and the thermal cracking laser generator can simultaneously emit to the surface of the photovoltaic cell piece and the two laser beams can intersect on the surface of the photovoltaic cell piece, so that laser spots of the two laser beams on the surface of the photovoltaic cell piece can form coincident and concentric laser spots;
(2) presetting a photovoltaic cell slice cutting scanning path S according to a photovoltaic cell slice cutting line in a control system, wherein the photovoltaic cell slice cutting scanning path S consists of a head-end slotted hot cracking path S1, a middle hot cracking path S2 and a tail-end slotted hot cracking path S3 which are sequentially continuous;
(3) the control system controls the laser cutting device and the photovoltaic cell slice after debugging in the step (1) to move relatively according to the cutting scanning path S of the photovoltaic cell slice in the step (2), wherein,
in the relative movement process according to the head end slotting heat cracking path S1 and the tail end slotting heat cracking path S3, the control system controls the slotting laser generator and the heat cracking laser generator of the laser cutting device to be simultaneously started, so that two laser beams intersect on the surface of the photovoltaic cell in the two relative movement processes to form concentric coincident laser spots, and simultaneously scan the surface of the photovoltaic cell, and the laser beams of the heat cracking laser generator heat the cell while the laser beams of the slotting laser generator slot the cell;
and in the relative movement process according to the intermediate thermal cracking path S2, the control system controls the opening and closing of a slotted laser generator and the opening of a thermal cracking laser generator of the laser cutting device, and laser beams emitted by the thermal cracking laser generator heat and scan the photovoltaic cell in the relative movement process.
2. The nondestructive cutting method for the photovoltaic cell slice as claimed in claim 1, wherein: the laser cutting device comprises an installation part, the angle of the slotted laser generator and the angle of the hot-cracking laser generator are adjustably installed on the installation part, the specific operation of the step (1) is to adjust the installation angle of the slotted laser generator and/or the hot-cracking laser generator on the installation part, so that two laser beams just can intersect and form on the surface of the photovoltaic cell and coincide and form the concentric laser light spots.
3. The nondestructive cutting method for the photovoltaic cell slice as claimed in claim 2, wherein: in the step (1), the grooving laser generator is firstly installed on the installation part and is set to be vertical to the surface of the photovoltaic cell piece, then the thermal cracking laser generator is assembled on the installation part and is adjusted to move in the X direction and the Y direction, so that the laser beam of the thermal cracking laser generator and the laser beam of the grooving laser are intersected on the surface of the photovoltaic cell piece in an angle mode, and coincident and concentric laser spots are formed.
4. The nondestructive cutting method for the photovoltaic cell slice as claimed in claim 1, wherein: the laser cutting device comprises a dichroic mirror, the wavelength of the slotted laser generator is different from that of the hot-cracking laser generator, the slotted laser generator and the hot-cracking laser generator are arranged in the step (1) that two laser beams of the slotted laser generator and the hot-cracking laser generator simultaneously irradiate towards the dichroic mirror, one laser beam can penetrate through the dichroic mirror and then irradiate towards the surface of a photovoltaic cell piece, the other laser beam is reflected by the dichroic mirror and then irradiates towards the surface of the photovoltaic cell piece, and the angle of the dichroic mirror is adjusted so that the two laser beams respectively transmitted and reflected by the dichroic mirror can simultaneously irradiate towards the surface of the photovoltaic cell piece and can intersect on the surface of the photovoltaic cell piece to form coincident and concentric laser spots.
5. The nondestructive cutting method for the photovoltaic cell slice as claimed in any one of claims 1 to 4, wherein: in the step (2), the length of the head-end slotting thermal cracking path S1 is the length of the head-end slotting of the photovoltaic cell slice cutting line, and the length of the tail-end slotting thermal cracking path S3 is the length of the tail-end slotting of the photovoltaic cell slice cutting line.
6. The special cutting device for the nondestructive cutting method of the photovoltaic cell as claimed in claim 2, which comprises a slotted laser generator, a thermal cracking laser generator and a control system, wherein the slotted laser generator and the thermal cracking laser generator are respectively connected with the control system in an electric control manner, and the special cutting device is characterized in that: slotted laser generator, hot crack laser generator install in the installation department just angularly adjustable slotted laser generator's laser beam, hot crack laser generator's laser beam all towards photovoltaic cell piece surface to two bundles of laser beams just in time can intersect and form coincident and endocentric laser facula on photovoltaic cell piece surface, control system can control the installation department that installs angularly adjustable slotted laser generator and hot crack laser generator wholly with between the photovoltaic cell piece according to the photovoltaic cell piece cutting path synchronization relative movement of predetermineeing and at the relative movement in-process control system can control opening and closing of slotted laser generator, hot crack laser generator.
7. The special cutting device for the nondestructive cutting method of the photovoltaic cell piece as claimed in claim 6, wherein: install in the laser beam of the fluting laser generator emission of installation department is perpendicular with photovoltaic cell piece surface, thermal crack laser generator with fluting laser generator is angle slope install in on the installation department, and make the laser beam of fluting laser generator with thermal crack laser generator's laser beam is that angle ground intersects at photovoltaic cell piece surface and forms coincident and concentric laser facula on photovoltaic cell piece surface.
8. The special cutting device for the nondestructive cutting method of the photovoltaic cell as claimed in claim 4, which comprises a slotted laser generator, a thermal cracking laser generator and a control system, wherein the slotted laser generator and the thermal cracking laser generator are electrically connected with the control system respectively, and the special cutting device is characterized in that: the control system can control the grooving laser generator, the thermal cracking laser generator and the photovoltaic cell to synchronously and relatively move between the whole body of the grooving laser generator, the thermal cracking laser generator and the photovoltaic cell according to a preset photovoltaic cell cutting path, and can control the grooving laser generator and the thermal cracking laser generator to be opened and closed in the relative movement process.
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| CN113664393A (en) * | 2021-09-30 | 2021-11-19 | 卡门哈斯激光科技（苏州）有限公司 | Nondestructive cutting method and device for solar photovoltaic cell |
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| CN113664393A (en) * | 2021-09-30 | 2021-11-19 | 卡门哈斯激光科技（苏州）有限公司 | Nondestructive cutting method and device for solar photovoltaic cell |
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