556 results about "Laser assisted" patented technology

The invention relates to the technical field of photovoltaic cells, and discloses a method for improving laser-assisted sintering contact uniformity and a processing device. The method comprises the steps that a probe presses a main grid of a first area on the front face of a battery piece, first laser power is used for scanning a second area on the front face of the battery piece in a laser scanning mode in the fine grid direction, first reverse bias voltage is applied to the battery piece, and a variable resistor adjusts the resistance value of the variable resistor according to the distance between scanning point positions and the probe so as to balance the bias voltage difference of different scanning point positions; performing laser-assisted sintering on the second area; the probe presses a main grid of a second area on the front face of the battery piece, laser scanning is conducted on a first area on the front face of the battery piece in the fine grid direction through second laser power, second reverse bias voltage is applied to the battery piece, the resistance value of the variable resistance piece is adjusted according to the distance between the scanning point position and the probe, and laser-assisted sintering of the first area is completed. According to the method, the bias voltage difference of different scanning point positions can be balanced, the interface contact difference of different areas can be balanced, and the battery performance and effect can be improved.

The invention relates to the technical field of welding, in particular to a double-laser double-swing auxiliary MIG electric arc thick plate narrow gap welding method and device, and the welding method specifically comprises the following steps that S1, initial positioning is conducted; s2, performing double-laser cross scanning preheating; s3, MIG electric arc auxiliary fusion is conducted, specifically, MIG electric arc is introduced on the basis of a molten pool formed by laser, so that the molten pool is stably combusted under laser induction, the common molten pool effect is achieved, and complete fusion of the side wall and the root of the groove is promoted; s4, real-time monitoring and adjustment in the welding process are conducted, specifically, in the welding process, the state of a molten pool and the welding quality are monitored in real time, and the laser power, the electric arc parameters and the welding speed are dynamically adjusted; and S5, welding seam quality detection. The double-laser-assisted MIG electric arc is used, the stability of the MIG electric arc is remarkably enhanced, the advantage of MIG filling efficiency is brought into play, and the welding efficiency and the welding quality are effectively improved.

The invention provides a laser-assisted rolling forming method and device for reducing springback of a high-strength metal part, and the method comprises the steps that the motion trail of a rolling tool head is designed according to the shape of a target part, and the rolling tool head rolls a to-be-machined part according to the motion trail until the target part is formed; a laser head is fixedly installed on one side of the rolling tool head, during rolling forming, the local bending area of the to-be-machined part is heated, the material forming performance is improved, and meanwhile the forming load is reduced so as to reduce springback. According to the laser-assisted rolling forming method and device for reducing resilience of the high-strength metal part, the laser head emits the laser to preheat the to-be-machined part, the to-be-machined part is subjected to rolling forming in cooperation with the rolling tool head, the to-be-formed local area is softened, and the resilience of the high-strength metal part is reduced. And the forming load is reduced, so that the high-strength metal part with smaller resilience and higher geometric accuracy is obtained, the operation is convenient, and the machining and forming effect is good.

The invention provides laser-assisted sintering base metal slurry for a TOPCon solar cell and a preparation method of the laser-assisted sintering base metal slurry, and relates to the technical field of photovoltaic cell manufacturing, the slurry comprises the following components: nickel powder, glass powder and an organic carrier; wherein the glass powder at least comprises two types of glass powder, one type of glass powder is corrosive glass powder, and the corrosive glass powder at least comprises one or two of lead oxide, bismuth oxide or antimony oxide; the other kind of glass powder is auxiliary promotion type glass powder, and the auxiliary promotion type glass powder takes silicon and borate as main bodies; the two kinds of glass powder do not contain first main group element oxides. The nickel powder is used for replacing silver powder, the contact defect is made up through the LECO technology, the specific glass powder formula and the high-temperature sintering technology are combined, performance balance is achieved, and verification experiments prove that the nickel paste achieves the same efficiency (gt; 24.5%), and the cost is reduced by about 30%-40%.

The invention discloses a YOLOv5-assisted vision-laser integrated efficient bird repelling method and device, and the method comprises the steps: obtaining the video stream data of a monitoring region in real time, inputting the video data into a multi-modal target detection model, extracting a key frame containing a target bird through the pre-trained multi-modal target detection model, and carrying out the recognition of the key frame, wherein the multi-modal target detection model is constructed by a YOLOv5 network structure; performing species feature analysis on the key frame; acquiring position coordinates after accurately identifying bird types; generating a dynamic control instruction based on the positioning data; the laser bird repelling module is driven to emit green light with the wavelength of 532 nm to optically repel birds; the system is integrated with a closed-loop feedback mechanism, and the bird repelling effect is verified through secondary image acquisition. The method can be applied to key fields such as airports, orchards, photovoltaic power plants and wind power plants, can also be expanded to the fields of ecological monitoring and agriculture, and has a good application prospect.

The invention discloses a laser-assisted mechanical drilling rock breaking system which comprises a drill rod, a cooling channel distributed along the length of the drill rod is arranged in the drill rod, a laser emitting head is arranged at the position, corresponding to the cooling channel, of the top of the drill rod, and a mechanical drill bit is fixedly connected to the lower end of the drill rod. The laser emitting head emits laser beams in the drill rod in the direction towards the mechanical drill bit, a chip removal through hole is formed in the center of the mechanical drill bit, the chip removal through hole and a cooling channel in the drill rod are coaxially arranged, a plurality of laser spraying holes are evenly formed in the mechanical drill bit, and the laser emitting head is connected with a laser generator through a laser transmission pipe. The laser generator is electrically connected with a control terminal through a wire. The problem that in the prior art, single laser rock breaking cannot be coordinated with mechanical rock breaking equipment during rock breaking, so that the rock breaking efficiency is poor or the equipment is overheated is solved. The invention further discloses a rock breaking method of the mechanical drilling rock breaking system based on laser assistance.

The invention provides a laser-assisted sintering method, a crystalline silicon solar cell and a photovoltaic module, and relates to the technical field of crystalline silicon solar cells. The laser-assisted sintering method comprises the steps that a to-be-sintered area of the crystalline silicon solar cell is divided into N equal parts in the direction perpendicular to a fine grid line, the first to Nth to-be-sintered areas which are arranged in sequence are obtained, and N is a positive integer larger than or equal to 4; and laser is adopted to irradiate the metal grid lines on all the to-be-sintered areas, and bias voltage is loaded on the metal grid lines on all the to-be-sintered areas so that the metal grid lines can be sintered. The crystalline silicon solar cell prepared with the metal grid lines is divided into a plurality of to-be-sintered areas, the bias voltage and the laser output power of each to-be-sintered area are controlled, the sintering effect of the metal grid lines can be effectively improved, the crystalline silicon solar cell forms good ohmic contact, and therefore the photoelectric conversion efficiency of the crystalline silicon solar cell is improved.

The invention relates to a laser-assisted stamping processing method for a high silicon steel sheet, which comprises the following steps: performing laser pre-cutting on a segmented high silicon steel strip with the depth of laser pre-cutting being 25-50% of the thickness of the high silicon steel strip, then conveying the pre-cut high silicon steel strip to a stamping platform through a conveyor belt for stamping operation, and meanwhile, performing laser pre-cutting on the high silicon steel strip to obtain a high silicon steel sheet with the depth of laser pre-cutting being 25-50% of the thickness of the high silicon steel sheet. And when the next section of high-silicon steel strip is subjected to laser pre-cutting, the cutting machine and the punching machine work synchronously and coordinately, and during punching operation, the radius of the punching die is smaller than the radius of laser cutting, so that the contact stress between the die and the high-silicon steel strip during punching is reduced. Firstly, a laser cutting mode is adopted for pre-cutting a high silicon steel strip, and the influence of magnetic performance deterioration caused by laser cutting is reduced; and stamping is adopted to reduce the stress of the material, so that a product with a complete edge is obtained, burrs and cracks on the edge are reduced, a high-precision product is obtained, meanwhile, the machining efficiency is improved, the rejection rate is reduced, and the cost is reduced.

The invention relates to a photovoltaic cell preparation method, a photovoltaic cell, a laminated cell and a photovoltaic cell module. Providing an initial battery piece; depositing and forming a protective layer on the surface; carrying out laser treatment twice; printing and sintering to form an electrode; and carrying out at least two times of laser-assisted sintering on the electrode. According to the photovoltaic cell preparation method, the protection layer at the first area is removed, the doping concentration at the first area is improved, and at least two times of laser-assisted sintering are combined, so that on one hand, the metal contact area is optimized, the usage amount of silver paste is reduced, the material cost is reduced, and meanwhile, paste contact sintering is enhanced; damage caused by laser grooving doping is removed; and on the other hand, the doping concentration is optimized, the contact resistance is remarkably reduced, the open-circuit voltage and the filling factor are favorably improved, the shading loss is reduced, and the current collection efficiency is ensured, so that the photoelectric conversion efficiency and the reliability of the cell are remarkably improved, the production process is simplified, and the production cost is reduced.

The invention discloses a direct visual field testing device, which relates to the technical field of testing and comprises a video auxiliary device and a marker device, the video auxiliary device realizes three-dimensional positioning and real-time video acquisition of preset eye spots through a height adjusting mechanism, an angle adjusting mechanism and a holder adjusting mechanism; the marker device realizes accurate adjustment and stable positioning of a marker in a test area through a height adjusting rod, a knuckle bearing and laser-assisted positioning; the direct visual field testing device is suitable for accurate measurement of the visual field range of a driver, can efficiently collect and record testing data, has the advantages of being convenient to operate, high in adaptability, high in precision and the like, and is widely applied to the fields of vehicle design, driving training, safety research and the like.

The invention belongs to the technical field of laser measurement equipment, and provides a laser experiment device for measuring laser power reduction in a submerged environment, which comprises an experiment platform, a laser generation system and an experiment system, the experiment system comprises a submerging container and a laser power reduction measuring assembly. A liquid medium is stored in the submerged container, and the sample is submerged in the liquid medium; the laser power reduction measuring assembly is located below the submerging container. Laser emitted by the laser head irradiates a sample in the submerged container, and the laser power reduction measuring assembly is used for measuring the power reduction of the laser penetrating through the liquid medium; as a device for measuring laser reduction, the laser reduction degree of laser power and energy under different liquid media can be explored, the reduction influence of different liquid media on the laser power can be explored, the optimal laser power corresponding to the liquid media can be found, the laser-assisted rock breaking strategy in the drilling process can be correspondingly adjusted, and the drilling efficiency is improved. And effective data can be provided for laser-assisted rock breaking in a liquid environment.

The invention belongs to the technical field of additive manufacturing, and particularly relates to a multi-mode laser coupling additive manufacturing method for a high-strength and high-toughness wear-resistant layered part, which comprises the steps of part manufacturing planning, base material pretreatment, multi-mode coupling laser construction, additive manufacturing and the like. Through the laser shaping system and the light path system, the laser light source is shaped into the continuous flat-topped annular laser, the continuous flat-topped annular laser is assisted by the flat-topped pulse laser and the flat-topped oscillation laser for additive manufacturing, the organization structure of a component is homogenized, the nucleation rate in the solidification process is effectively increased, and finally refined crystal grains are obtained; meanwhile, the shape and stress state of the molten pool can be changed, and then the performance of the component is improved. Gradient changes of component components are achieved through cooperative feeding of multiple wires, a workpiece obtains excellent strength, plasticity and toughness, meanwhile, the surface layer of the component is strengthened through a ceramic material, the part obtains extremely high wear resistance, and finally the part with high strength, toughness and wear resistance is obtained.

The invention belongs to the technical field of moon sampling, and provides a casing type laser-assisted coring drilling tool for a moon-based extreme environment, which comprises a drill bit, a base, a laser head, a drill rod, a coring pipe and a motor, the bottom of the base is rotatably connected with a drill rod. The bottom of the drill rod is fixedly connected with a drill bit. A coring pipe is coaxially arranged in the drill rod, and an annular cavity is formed between the outer side face of the coring pipe and the inner side face of the drill rod. A laser head is mounted in the base; the laser head is located above the annular cavity, and laser emitted by the laser head penetrates through the annular cavity and is emitted out of the drill bit. Aiming at the lunar-based environment, through the synergistic mechanism of mechanical rotary rock breaking and laser-assisted softening, the lunar rock is softened by means of laser energy, the mechanical cutting resistance of the drill bit is greatly reduced, and efficient and continuous coring operation is achieved; the key technical problems that a traditional drilling tool is difficult in space arrangement, low in efficiency and the like are solved, and the efficiency of the lunar geology coring task and the rock sample fidelity are remarkably improved.

The invention relates to a Spin Exchange Relaxation-Free (SERF)-based magnetometer system (100) for detecting ultra- weak magnetic fields, particularly suited for bio¬ sensing applications such as MEG, MCG, and MRI. The system operates at room temperature and includes a VCSEL (101) emitting dual beams tuned to Rubidium-87 transitions, a microfabricated vapor cell (102) with LIAD-based heating (103), and an optical assembly (104) for polarization control. A detection unit (105) converts Faraday rotation into electrical signals, enhanced by lock-in amplification. Magnetic shielding (106), thermal management (107), and relaxation mitigation maintain SERF conditions. A calibration subsystem (109) and embedded machine learning module (110) optimize sensitivity in real time. The compact, cryogen-free architecture enables portable and wearable applications. The invention achieves femtotesla-level sensitivity while overcoming limitations of conventional SQUID-based systems, making it suitable for clinical and field deployments.

The invention discloses a laser-assisted helium arc penetration fusion welding method, and belongs to the technical field of welding. The problems that according to an existing paraxial laser-electric arc composite structure, the welding track is difficult to control, the energy coupling efficiency is low due to laser energy loss, and weld joint partial melting and undercut defects are caused due to uneven distribution of a welding temperature field due to a generated asymmetric heat source are solved. The welding method comprises the steps of 1, pretreatment; 2, after being focused by a focus lens, the laser is divided into three laser beams through a spectroscope, then the three laser beams are converged again through a plurality of reflectors, three fan-shaped light spots are formed on the surface of the to-be-welded plate after convergence, and finally the focal plane position of the laser is adjusted to be located on the surface of the to-be-welded plate; 3, setting welding current and arc voltage; and fourthly, laser is used for assisting helium arc penetration fusion welding. The method is used for laser-assisted helium arc penetration fusion welding.

The invention discloses a preparation method of a laser-assisted titanium alloy ion nitriding wear-resistant coating. The method comprises the following steps: 1, treating a titanium alloy workpiece; secondly, the treated titanium alloy workpiece is subjected to ion nitriding, and a nitriding layer with a hard shell layer structure is formed; 3, performing laser remelting on the infiltrated layer to destroy a hard shell layer structure; and fourthly, the titanium alloy workpiece subjected to laser remelting is subjected to ion nitriding diffusion permeation, and the wear-resistant coating is formed. The wear-resistant coating is prepared on the surface of the titanium alloy workpiece through the laser-assisted ion nitriding method, the hard shell layer structure on the surface of the nitriding layer is eliminated through laser remelting, the thickness and quality of the wear-resistant coating are improved, phase change and workpiece deformation are avoided, and the preparation process is simple, high in reliability and suitable for application and popularization.

The invention discloses a processing method of a high-toughness stainless steel / carbon steel composite plate, which comprises the following steps: compounding a high-strength carbon steel plate and a stainless steel plate through a rolling compounding process under the action of laser-assisted heating; then, the stainless steel / carbon steel composite sheet is subjected to temperature control type online periodic laser surface annealing treatment, so that a corrosion-resistant structure with a non-uniform structure in which coarse grains (a soft region) and fine grains (a hard region) are alternately arranged can be obtained on the stainless steel surface layer, and the corrosion resistance of the composite plate is improved; and meanwhile, the stress relief effect induced by laser surface annealing treatment is combined with high-temperature tempering softening of a martensitic structure on the carbon steel side part at the interface, and a heterogeneous structure induced by laser surface annealing treatment can synchronously improve the obdurability of the stainless steel / carbon steel composite plate.

The invention discloses a short pulse laser assisted continuous laser welding device and method. The method comprises the steps that materials are laid; a welding area is divided, and the whole welding area is divided into small areas; performing feature extraction on the small regions; constructing a speed mapping table according to the extracted different features; and planning a laser scanning path according to the speed mapping table. The short-pulse laser-assisted continuous laser welding device and method have the beneficial effects that near-infrared wavelength laser (such as 1064nm) is selected in the whole welding process, and the characteristics of high reflectivity of titanium alloy to the wavelength, high absorptivity of thermoplastic resin, relatively low absorptivity of a resin part in a thermosetting composite material and poor absorptivity of carbon fibers to the wavelength are utilized; laser energy is mainly concentrated on the thermoplastic resin layer, and local heating is achieved. The method comprises the following steps: dividing a region into small regions, extracting features, constructing a speed mapping table, controlling laser energy input, and reducing heat affected zones of the titanium alloy and the thermosetting composite material.

The invention discloses a BDD electrode material and a preparation method thereof. The preparation method comprises the following core steps: pretreating the surface of a porous titanium substrate; depositing a nanoscale TiN film layer on the surface of the pretreated porous titanium substrate in advance; depositing a layer of single-walled carbon nanotube network on the TiN thin film layer by using an electrophoretic deposition method; growing a highly-doped BDD layer on the single-walled carbon nanotube network by adopting a plasma enhanced chemical vapor deposition technology; repeating the two steps to form a multi-layer SWCNT / BDD composite structure, and controlling the thickness of the multi-layer SWCNT / BDD composite structure to be 1-50 microns; and finally, depositing a low-doped BDD active layer with the thickness of 1-5 microns by adopting a hot filament chemical vapor deposition (HFCVD) technology. According to the pulse laser assisted preparation process provided by the invention, the femtosecond laser pulse is introduced to replace traditional plasma treatment, so that the process flow is simplified, and the efficiency is improved; according to the technology, the process is simplified, the quality of the TiN film is improved through accurate energy input, and a new way is opened up for further improving the performance of the BDD electrode.

The invention discloses a conductive paste low-temperature laser sintering method and application thereof, and the method specifically comprises the steps: applying a low-temperature laser sintering technology to the sintering process of low-silver or silver-free conductive paste, and achieving the efficient and uniform molding of a conductive layer at a lower temperature through the control of the frequency, power density and wavelength of laser. The damage of high-temperature sintering to the material structure is avoided, the conductivity of the conductive paste is effectively improved, the use of silver is reduced, and the cost is reduced; besides, the conductive paste is modified by adding a modifier, and in practical application, the photovoltaic conductive paste with the silver content of 8.5% shows excellent conductivity after being subjected to laser-assisted sintering.

The invention discloses an intelligent belt crack and tear detection system based on machine vision and laser coupling, and relates to the technical field of belt conveying. The intelligent belt crack and tear detection system based on machine vision and laser coupling comprises a visual detection module, an image processing flow module, a laser-assisted detection module and a data processing and control module, and the visual detection module comprises double-view-angle linear array cameras (a camera 1 and a camera 2), an area array monitoring camera and an intelligent light source system; the image processing flow module comprises multi-modal feature fusion, dynamic threshold segmentation, morphological filtering and deep learning classification; the laser-assisted detection module comprises a laser array sensor; the data processing and control module comprises an edge computing unit, an upper computer system, an integrated expert system, early warning and linkage control, system automation and intelligentization, operation and maintenance cost reduction, unmanned detection, full-process automatic operation, manual inspection frequency reduction and manpower cost saving by more than 50%.

The invention relates to a three-dimensional high-density interconnection method for a substrate and an IC chip, and the method comprises the following steps: carrying out the multi-layer dielectric composite processing of a preset silicon substrate, and obtaining a silicon through hole array structure with a preset depth-to-width ratio; performing metal filling on the silicon through hole array structure to obtain a three-dimensional interconnection conductive path; performing surface treatment on the three-dimensional interconnection conductive path to obtain a micro bump structure with gradient metallization; performing laser-assisted bonding on the micro bump structure to obtain a silicon bridge-substrate temporary structural body; carrying out bottom filling on the silicon bridge-substrate temporary structure body through a supercritical fluid auxiliary injection technology to obtain a packaging structure body with a stress release function; and a preset IC chip and the packaging structure body are assembled and fixed to obtain a three-dimensional high-density interconnection packaging body, and the technical problem that a traditional two-dimensional plane interconnection method is difficult to meet the requirement of high-density integration is solved.

The invention relates to a fatigue limit rapid prediction method based on infrared thermal image energy dissipation characteristics. The method comprises the steps of sample preparation and pretreatment, fatigue loading stress level upper limit determination, infrared fatigue test and temperature rise data acquisition, thermal image data processing and temperature rise feature extraction, energy dissipation model construction, fatigue limit value prediction, error analysis and method verification. The method comprises the following steps: monitoring steady-state temperature rise rates under different stresses through a thermal infrared imager, establishing a relation curve between a dissipation rate and a stress amplitude, predicting a fatigue limit based on a least square method, and comparing the fatigue limit with an S-N test result for verification. Compared with a traditional method, the method has the advantages of high prediction precision, high response sensitivity, low loss, short test period and the like, and is particularly suitable for rapid fatigue limit prediction and strengthening effect judgment of the high-temperature alloy material subjected to laser-assisted ultrasonic rolling strengthening.

The invention provides a production method of a photovoltaic cell. The production method comprises the following steps: printing an electrode on the surface of a cell piece; carrying out sintering treatment on the battery piece after the electrode is printed; the sintered battery piece is cut; passivating the side surface of the cut battery piece to form a passivation layer; and carrying out multiple times of optical auxiliary treatment on the battery piece, wherein the multiple times of optical auxiliary treatment comprises carrying out at least one time of laser auxiliary sintering treatment on the passivated battery piece. In the production method, multiple times of optical auxiliary treatment can meet different process requirements by setting process parameters step by step, defects generated in the sintering and cutting processes are fully repaired, carrier recombination is reduced, and the photoelectric conversion efficiency is improved.

The invention provides a stress distribution optimization method and system for lens processing, and is applied to the field of data distribution processing. The internal stress information of the pre-selected material is identified and compared with the preset threshold value, the potential stress concentration area is accurately found, the crystal structure and the cutting mode of the material are combined, the cutting parameters are dynamically adjusted to reduce the machining residual stress, meanwhile, the problem area is rapidly positioned through simulation and actual stress distribution matching detection, and the machining precision is improved. And secondary annealing is conducted on the unmatched area to release residual stress, the surface stress state is adjusted through the technologies of low-temperature coating, ion-assisted coating, laser-assisted coating, sputter coating and the like, and the internal stress of the coating is introduced to achieve overall stress redistribution.

The invention provides a linear laser-assisted centering device and method for a drilling machine. The linear laser-assisted centering device comprises a base, a magnet, a laser adjusting seat and a linear laser transmitter. The laser adjusting seat is used for accommodating the linear laser transmitter, and screws are arranged on the periphery of the side surface of the laser adjusting seat to adjust the posture of the linear laser transmitter; the base comprises a shaft sleeve and branches; the shaft sleeve is sleeved on a drill clamp root flange seat of a drilling machine, and the central aperture of the shaft sleeve corresponds to the excircle diameter of the drill clamp root flange seat of the drilling machine; one end of the branch is connected to the shaft sleeve, and the other end of the branch is connected with the laser adjusting seat and fixes the laser adjusting seat; slotted holes are formed in the branches and used for connecting and fixing the base and a drilling machine; the magnets are inserted into the slotted holes of the branches and used for magnetically attracting the base to a drilling machine to be fixed. The positions of laser projection lines of the linear laser emitters are adjusted respectively, the laser projection lines are projected to a rear vertical plate through a middle gap of the laser position adjusting auxiliary sample plate, and workpiece centering is achieved.

The invention discloses a preparation method of a TBC battery electrode grid line, the electrode grid line and a TBC battery, and belongs to the technical field of solar cells, and the preparation method comprises the following steps: carrying out double-sided polishing on a silicon wafer; sequentially depositing a tunneling oxide layer and an intrinsic polycrystalline silicon layer on the back surface of the silicon wafer, and performing boron diffusion; digging an N region and a PN connection partition region on the back surface of the silicon wafer; sequentially depositing a tunneling oxide layer and an intrinsic polycrystalline silicon layer on the back surface of the silicon wafer, and performing phosphorus diffusion on the basis of the tunneling oxide layer and the intrinsic polycrystalline silicon layer; digging a P region and a GAP region on the back surface of the silicon wafer, and digging a hole channel by using a second laser; removing the borosilicate glass layer and the phosphorosilicate glass layer in the pore channel area; sequentially depositing an aluminum oxide layer and a silicon nitride layer on the surface of the silicon wafer; printing non-burn-through slurry in the main grid areas of the P area and the N area through the silk screen printing plate; and carrying out laser-assisted sintering on the auxiliary grid line pore channel region. The completeness of a passivation film layer structure on the back surface of the battery piece is ensured, meanwhile, the contact area of a metal electrode and a silicon substrate is reduced, and metal contact recombination is effectively reduced.

The invention provides a laser-assisted sintering method of a TOPCon solar cell, and relates to the technical field of TOPCon solar cells. The laser-assisted sintering method comprises the following steps that a battery piece subjected to light injection treatment is placed on an operation table, external voltage is applied to the battery piece to ensure that the front face of the battery piece is a negative electrode power source, and a laser is adopted to only conduct laser scanning treatment on a grid line area of the battery piece. The laser scanning treatment comprises the following specific steps of: scanning a laser beam along one side of the grid line, then scanning the end part of the grid line for the second time in an S shape along the other side of the grid line, and covering the position of the grid line by a light spot during each scanning; and all the grid lines are scanned by the laser. The laser-assisted sintering method has the advantages that the process time is shortened, the energy is finely controlled, and the conversion efficiency of the battery piece is improved.

The invention relates to the technical field of solar cells, and discloses a laser-assisted etching slotting method for preparing high-doping-concentration P + polycrystalline silicon and application. The grooving method comprises the following steps: preparing a tunneling SiOx layer and an i-polysi layer on the back surface of a silicon wafer; performing patterning etching by using green picosecond laser so as to remove the i-polysi layer and the tunneling SiOx layer in a laser region; removing impurities in a laser area through single-side acid pickling; boron diffusion is carried out, P + polycrystalline silicon is formed on the i-polysi layer in the non-laser area, a P + emission layer is generated in the laser area, and a BSG layer is generated on the back faces of the P + polycrystalline silicon and the P + emission layer; performing patterning etching by using green picosecond laser to remove the BSG layer in the laser area; and carrying out alkali wet etching to remove the P + emission layer in the laser area so as to form a notch. According to the grooving method, the notch with the ideal grooving depth is formed, P + polycrystalline silicon with high doping concentration can be formed in the non-laser area to reduce the contact resistivity, and the cost is low.

The invention discloses a laser-assisted sintering method for a TOPCON solar cell, the TOPCON solar cell and a photovoltaic module. The front surface of the battery is divided into a first edge region, a middle region and a second edge region along a first direction, and grid lines are arranged on the front surface; performing laser-assisted sintering on the first edge region and the second edge region under a first bias voltage U1; performing laser-assisted sintering on the middle region under a second bias voltage U2; wherein U2-U1 is marked as U, 0.5 V < U < = 9V, the length of the battery along the first direction is L, the lengths of the first edge region, the second edge region and the middle region along the first direction are d1, d2 and d3 respectively, d3 = L-d1-d2, 0.02 L < d1 < = 0.25 L, and 0.02 L < d2 < = 0.25 L. A high bias value is used in the middle region, so that high photoelectric conversion efficiency of the battery piece can be kept; the edge area has a proper size, and the edge area is subjected to laser-assisted sintering by using a relatively low bias value, so that the problem of EL edge blackening can be relieved and even solved.