9588 results about "Solar battery" patented technology

Systems, methods, and articles for a portable power case are disclosed. The portable power case is comprised of at least one battery and at least one PCB. The portable power case has at least two access ports and at least one USB port. The portable power case is operable to supply power to an amplifier, a radio, a wearable battery, a mobile phone, and a tablet. The portable power case is operable to be charged using solar panels, vehicle batteries, AC adapters, non-rechargeable batteries, and generators. The portable power case provides for modularity that allows the user to disassemble and selectively remove the batteries installed within the portable power case housing.

A system for supplying power to a portable battery pack including a battery enclosed by a wearable and replaceable pouch or skin using at least one solar panel is disclosed, wherein the pouch or skin can be provided in different colors and / or patterns. Further, the pouch or skin can be MOLLE-compatible. The battery comprises a battery element housed between a battery cover and a back plate, wherein the battery element, battery cover, and back plate have a slight curvature or contour. Further, the battery comprises flexible leads.

Systems, methods, and articles for a portable power case are disclosed. The portable power case is comprised of at least one battery and at least one PCB. The portable power case has at least one USB port and at least two access ports, at least two leads, or at least one access port and at least one lead. The portable power case is operable to supply power to an amplifier, a radio, a wearable battery, a mobile phone, and a tablet. The portable power case is operable to be charged using solar panels, vehicle batteries, AC adapters, non-rechargeable batteries, and generators. The portable power case provides for modularity that allows the user to disassemble and selectively remove the batteries installed within the portable power case housing.

The invention discloses a self-assembled monomolecular layer material with an asymmetric intermediate core and a preparation method and application thereof, and belongs to the field of solar cells. The self-assembled monomolecular layer material is formed by combining an asymmetric intermediate core with anchoring groups such as phosphonic acid and sulfonic acid, has good hydrophobicity and high light transmittance, can be used as a hole transport layer material, and is used for preparing organic solar cells and perovskite solar cells with p-i-n structures, the organic solar cell achieves the maximum energy conversion efficiency of 18.9%, shows excellent environmental stability, still keeps 95% or above of the initial performance after being stored in air for 480 h, and is far superior to a traditional device based on a PEDOT: PSS interface layer. By designing and developing a series of self-assembled monomolecular layer materials with asymmetric intermediate cores, the energy conversion efficiency and environmental stability of the solar cell can be remarkably improved.

The invention discloses a thiapyran molecule modified solar cell and a preparation method thereof. The cell sequentially comprises an ITO (Indium Tin Oxide) conductive glass layer, a 4-aminotetrahydro-2H-thiapyran-1, 1-dioxide hydrochloride modified [4-(3, 6-dimethoxy-9H-carbazole-9-yl) butyl] phosphonic acid hole transport layer, a Cs0.05 (FA < 0.77 > MA < 0.23 >) < 0.95 > Pb < (I < 0.77 > Br < 0.23 >) 3 wide-band gap perovskite thin film, a phenethyl ammonium iodide passivation layer, an electron transport layer of [6, 6]-phenyl-C61-butyric acid isomethyl ester, a 2, 9-dimethyl-4, 6, 7-tetrahydro-2H-thiapyran-1, 1-dioxide hydrochloride modified [4-(3, 6-dimethoxy-9H-carbazole-9-yl) butyl] the hole barrier layer is made of 1, 7-biphenyl-1, 10-phenanthroline; the electrode layer is made of metal Ag; according to the scheme, the hole transport layer is modified through thiapyran molecules, agglomeration of the hole transport layer is relieved, and a more compact and more uniform self-assembled single layer is generated by inducing favorable crystal orientation. A good bottom interface is obtained based on thiapyran molecule modification, and ordered growth of high-quality perovskite crystal grains is promoted. In addition, the energy level of the hole transport layer is effectively adjusted through thiapyran molecule treatment, and the extraction and transmission of carriers by the hole transport layer are enhanced.

The invention discloses a solar cell defect detection method based on a multi-mode sensing technology. The system comprises the following steps: 1, multi-modal data acquisition: acquiring multi-modal data in real time by using four sensing technologies of near-infrared laser, area array visible light, PL and EL; 2, multi-modal data processing: carrying out denoising, edge detection and feature extraction on the acquired near-infrared, visible light, PL and EL images by adopting a mixed image processing algorithm to obtain key defect features; 3, multi-modal data fusion: combining a multi-modal data fusion method with a decision-making level strategy, synthesizing different technical data, improving the detection precision, and classifying, positioning and labeling the defects of cracks, broken gates, scratches, depressions, poor welding and hot spots by using a convolutional neural network to ensure accurate distinguishing of surface and internal defects; and 4, defect marking and production line adjustment: marking defects and adjusting the production line through a feedback and automatic control module, and feeding back a real-time visual result to a management layer.

The invention relates to a solar cell and a manufacturing method thereof. The solar cell comprises a substrate, a first electrode and a second electrode, the front surface of the substrate comprises a first metallization region and a first non-metallization region, the first metallization region is provided with a first pyramid structure, the first non-metallization region is provided with a second pyramid structure, the spire of the first pyramid structure is higher than that of the second pyramid structure, and the first metallization region is provided with a first diffusion doping region; the back surface of the substrate comprises a second metallization region and a second non-metallization region, a tunneling layer and a semiconductor doping layer are sequentially laminated on one side, far away from the substrate, of the second metallization region, and the second non-metallization region is provided with a third pyramid structure; the first electrode is arranged in the first metallization region, and the first electrode is electrically connected with the first diffusion doping region; and the second electrode is arranged in the second metallization region and is electrically connected with the semiconductor doping layer. The short-circuit current output and the overall photoelectric conversion efficiency of the cell are improved, and the double-sided rate of the cell is improved.

The invention relates to a back contact solar cell and a preparation method thereof. The back contact solar cell comprises a monocrystalline silicon substrate, a tunneling oxide layer, a first doping type polycrystalline silicon layer, a second doping type polycrystalline silicon layer, an intrinsic amorphous silicon layer, a first electrode and a second electrode. The tunneling oxide layer is arranged on the first side of the monocrystalline silicon substrate, the first doping type polycrystalline silicon layer, the second doping type polycrystalline silicon layer and the intrinsic amorphous silicon layer are respectively arranged on the tunneling oxide layer, and the intrinsic amorphous silicon layer is arranged between the first doping type polycrystalline silicon layer and the second doping type polycrystalline silicon layer. The back contact solar cell is provided with an isolation groove, and the isolation groove divides the intrinsic amorphous silicon layer into a first part connected to the first doping type polycrystalline silicon layer and a second part connected to the second doping type polycrystalline silicon layer. According to the back contact solar cell, the interface defect of the monocrystalline silicon substrate at the back contact solar cell is overcome, and the insulation of two different doping types of media is realized.

A system for supplying power to a portable battery pack including a battery enclosed by a wearable and replaceable pouch or skin using at least one solar panel is disclosed, wherein the pouch or skin can be provided in different colors and / or patterns. Further, the pouch or skin can be MOLLE-compatible. The battery comprises a battery element housed between a battery cover and a back plate, wherein the battery element, battery cover, and back plate have a slight curvature or contour. Further, the battery comprises flexible leads.

The invention discloses a solar cell and a preparation method and application thereof, and relates to the technical field of solar cells. P-type doped regions and N-type doped regions are alternately arranged on the back surface of the crystalline silicon substrate, a boron diffusion doped layer, a first passivation layer and a first antireflection layer are sequentially arranged in the P-type doped regions, and a phosphorus-doped silicon oxide layer, a phosphorus-doped polycrystalline silicon layer, a second passivation layer and a second antireflection layer are sequentially arranged in the N-type doped regions from the surface of the crystalline silicon substrate. A traditional TBC battery P region mostly adopts a two-step process of intrinsic amorphous silicon deposition and boron diffusion to form a polycrystalline silicon layer, but the P region does not contain the polycrystalline silicon layer and can be prepared through a one-step boron diffusion process, so that the process steps can be reduced, and the process time can be shortened; and the action of laser and P-region polycrystalline silicon is avoided, the patterning difficulty of the battery is reduced, and the production yield of the battery can be greatly improved.

Systems, methods, and articles for a wearable and lightweight portable power case are disclosed. The portable power case is comprised of a cylindrical housing, at least two battery elements connected to a printed circuit board (PCB), and at least one separating barrier between the at least two batteries and the PCB. The portable power case is operable to supply power to an amplifier, a radio, a wearable battery, a mobile phone, a tablet, a portable satellite dish and / or any other power consuming device. The portable power case is operable to be charged using solar panels, vehicle batteries, AC adapters, non-rechargeable batteries, and / or generators.

The invention discloses a photovoltaic cell defect detection method, and the method comprises the steps: 1) adding an SPDConv convolution module in a backbone network Backbone of a YOLOv8 model, adding a BoTNet attention mechanism behind an SPPF layer of the backbone network Backbone, and obtaining a photovoltaic cell defect detection and recognition model; 2) training the photovoltaic cell defect detection and identification model by using a photovoltaic cell defect data set; and 3) inputting a photovoltaic cell defect image to be identified into the trained photovoltaic cell defect detection model to obtain a detection result. According to the method, fine defects distributed on the surface of the solar cell can be effectively processed, the receptive field of small target defects is expanded, the problem of key feature information loss is relieved, network attention is focused on the to-be-detected target, interference of irrelevant backgrounds is reduced, the parameter quantity is reduced, and the detection precision of the model is remarkably improved.

The utility model relates to the field of solar photovoltaic technology, in particular to a battery piece, a battery piece stacking structure and a solar battery assembly. In the battery piece, the plurality of first isolation bulges are arranged on the back surface of the battery piece body, and the first isolation bulges protrude out of the back surface of the battery piece body; the plurality of second isolation bulges are arranged on the front surface of the battery piece body and protrude out of the front surface of the battery piece body; the plurality of grid lines 40 are arranged on at least one surface of the battery piece body; in the thickness direction of the battery piece body, the height of at least one of the first isolation bulges and the second isolation bulges is greater than that of all the grid lines; and the plurality of second isolation bulges are projected on the back surface of the battery piece body, and the projection does not intersect with the first isolation bulges, or the projection partially intersects with the first isolation bulges. The arrangement of the first isolation protrusions and the second isolation protrusions effectively prevents the grid lines from making contact with the front face of the battery piece body.

The invention relates to the technical field of solar cells, in particular to a back contact solar cell interconnection method, which comprises the following steps of: arranging positive fine grid lines and negative fine grid lines on the back surfaces of cells in a staggered manner; printing conical insulating glue on the negative electrode fine grid lines and printing conductive glue on the positive electrode fine grid lines at the positions, corresponding to the positive electrode welding strips, of the discontinuous openings; printing a conical insulating adhesive on the positive electrode fine grid line and printing a conductive adhesive on the negative electrode fine grid line at the position of the discontinuous opening corresponding to the negative electrode welding strip; printing isolation glue on the edge of the cell corresponding to the positive electrode solder strip and the negative electrode solder strip; laying a positive electrode welding strip and a negative electrode welding strip on the conductive adhesive in a staggered manner; and then carrying out lamination welding treatment. Connection is achieved by printing the conductive adhesive between the fine grid lines, traditional main grid line connection is removed, and the use amount of silver paste is reduced; and a welding strip in a specific shape can be directly laid on the conductive adhesive for pre-curing, so that the welding strip is ensured to be fully connected with the fine grid through the conductive adhesive, and the problem of insufficient welding in later lamination is effectively solved.

The invention relates to a back contact solar cell and a preparation method thereof. The back contact solar cell comprises a monocrystalline silicon substrate, a tunneling oxide layer, a first doping type polycrystalline silicon layer, a second doping type polycrystalline silicon layer, an intrinsic amorphous silicon layer, a first electrode and a second electrode, the tunneling oxide layer is arranged on one side of the monocrystalline silicon substrate, and the first doping type polycrystalline silicon layer, the second doping type polycrystalline silicon layer and the intrinsic amorphous silicon layer are respectively arranged on the tunneling oxide layer. The intrinsic amorphous silicon layer is arranged between the first doping type polycrystalline silicon layer and the second doping type polycrystalline silicon layer, the first electrode is connected to the first doping type polycrystalline silicon layer, and the second electrode is connected to the second doping type polycrystalline silicon layer. According to the back contact solar cell, the generation of an electric leakage channel can be prevented, and the intrinsic amorphous silicon layer can perform chemical passivation on the monocrystalline silicon substrate, so that the conversion efficiency of the cell is improved.

The invention belongs to the technical field of solar cell materials, and particularly relates to silver-coated copper powder and a preparation method thereof. A preparation method of silver-coated copper powder comprises the following steps that copper powder subjected to surface activation through an acid-base solution and a complexing agent are dissolved in water, and copper powder turbid liquid is obtained; dropwise adding a silver source solution into the copper powder turbid liquid to carry out a replacement reaction, and adjusting the pH value of the solution after the reaction to obtain a silver-coated copper powder precursor turbid liquid; and dropwise adding a reducing agent solution into the silver-coated copper powder precursor turbid liquid, then dropwise adding a silver source solution, carrying out oxidation-reduction reaction, carrying out solid-liquid separation, washing, and drying to obtain the silver-coated copper powder. According to the preparation method provided by the invention, in the chemical oxidation reduction process, the silver-coated copper powder with different silver layer distribution structures, compact silver coating structure and better performance is obtained by regulating and controlling the dropping sequence and dropping rate of the reducing agent solution and the silver source solution.

The invention relates to the technical field of solar cells, in particular to a pyridinium compound doped perovskite solar cell and a preparation method thereof, a perovskite layer of the cell comprises Pb < 2 + > and a pyridinium compound doped in the perovskite layer, and the molar ratio of the pyridinium compound to the Pb < 2 + > is 1: 500-3: 250. By doping the pyridinium compound and Pb < 2 + >, the perovskite solar cell constructs a four-dimensional synergistic interaction mechanism of defect passivation, ultraviolet protection, energy conversion optimization and environmental protection. The M molecule not only solves the key problem that the perovskite material is easy to be damaged by ultraviolet and influenced by surface defects, but also provides a new solution for improving the comprehensive performance of the solar cell by improving the light utilization rate and the environmental tolerance. The preparation method of the M-doped perovskite solar cell provided by the invention is simple in process, easy to operate and beneficial to large-scale production.

Systems, methods, and articles for a portable power case are disclosed. The portable power case is comprised of at least one battery and at least one PCB. The portable power case has at least one USB port and at least two access ports, at least two leads, or at least one access port and at least one lead. The portable power case is operable to supply power to an amplifier, a radio, a wearable battery, a mobile phone, and a tablet. The portable power case is operable to be charged using solar panels, vehicle batteries, AC adapters, non-rechargeable batteries, and generators. The portable power case provides for modularity that allows the user to disassemble and selectively remove the batteries installed within the portable power case housing.

The invention provides a solar cell and a preparation method thereof. The solar cell comprises a silicon substrate, the front surface of the silicon substrate is provided with a textured structure, the front surface of the silicon substrate is divided into a working area and an edge isolation area, the working area comprises a p-type emitter, a first passivation layer and a first electrode which are sequentially arranged on the front surface from inside to outside, and the edge isolation area comprises the first passivation layer arranged on the front surface. A tunneling oxide layer, an n-type doped polycrystalline silicon layer, a second passivation layer and a second electrode are sequentially arranged on the back face of the silicon substrate from inside to outside, the reflectivity of the suede structure in the working area is R1, the reflectivity of the suede structure in the edge isolation area is R2, R1 / R2 is within the range of 0.3-3, and R2 is within the range of 0.3-3. And the distance between the suede structure substrate of the working area and the suede structure substrate of the edge isolation area is within the range of 3-10 [mu] m.

The invention discloses a perovskite solar cell buried interface modifier and a preparation method and application thereof, and belongs to the technical field of photovoltaic solar materials. The 2-(benzoylamino) benzoic acid serves as a perovskite solar cell buried interface modifier, the molecule has a structure shown in a formula (1), the molecule takes benzoic acid as an anchoring group and is used for modifying a hole transport layer NiOx / perovskite interface layer, defects at a NiOx / perovskite layer thin film crystal boundary are reduced, the morphology of the perovskite layer thin film is regulated and controlled, and the performance of the perovskite solar cell is improved. The charge transfer capability of the NiOx / perovskite layer interface is enhanced, the interface reaction and carrier recombination are inhibited, the photoelectric conversion efficiency and stability of the perovskite solar cell are improved, and a new preparation way is provided for preparing the efficient and stable perovskite solar cell. # imgabs0 #

The invention discloses a self-assembly material, a solar cell and electric equipment, the self-assembly material comprises a first self-assembly molecular material, the structural formula of the first self-assembly molecular material is # imgabs0 #, Ar represents an aryl group, the Ar comprises at least one coordination atom, the coordination atom comprises lone pair electrons which are not bonded, and the first self-assembly molecular material comprises a second self-assembly molecular material, a third self-assembly molecular material and a fourth self-assembly molecular material, the coordination atoms comprise one or more of phosphorus atoms, arsenic atoms, sulfur atoms and selenium atoms; l comprises one or more of a carbon-containing group, a nitrogen-containing group, an oxygen-containing group, a silicon-containing group, a phosphorus-containing group and a sulfur-containing group, and n is 0-10; a comprises a hydrophilic group. When the self-assembly material is used for passivating the light absorption layer of the solar cell, a better passivation effect can be realized, and the photoelectric conversion efficiency and the stability of the solar cell can be improved.

The invention discloses an electric power monitoring device for an energy storage power station, the electric power monitoring device is installed on an electric power support rod, the electric power monitoring device comprises a rack, the right side of the rack is welded with a fixing plate, the fixing plate is in a semicircle shape capable of surrounding the electric power support rod, the rack is provided with a clamping mechanism, and the clamping mechanism clamps the fixing plate on the electric power support rod; the top end of the rack is fixedly connected with a top plate through a second connecting rod, a rotating mechanism is arranged on the top plate, the rotating mechanism is connected with a rotating rod to drive the rotating rod to rotate, the top end of the rotating rod is fixedly connected with a mounting plate, and a freely telescopic cylinder is mounted on the mounting plate; a lifting mechanism is mounted at the tail end of the barrel and connected with the camera to drive the camera to move up and down; the rack is also provided with a solar cell panel, and the solar cell panel is used for storing energy and providing power for the electric power monitoring device. The power monitoring device is convenient to install and can comprehensively monitor the high-voltage lines installed on the two sides of the power support rod.

The invention relates to a preparation method of a solar cell and the solar cell, the solar cell comprises a substrate, a first surface of the substrate is provided with a plurality of first areas and a plurality of second areas which are distributed in a staggered manner, and each second area comprises a first sub-area and a second sub-area which are distributed along a first direction; the first region is provided with a tunneling oxide layer and a first doped conductive layer. The preparation method comprises the following steps: providing a substrate, and sequentially preparing a tunneling oxide layer, a first doped conductive layer and a dielectric layer on a first surface; performing graphical processing on the second region by adopting first laser, and sequentially modifying the dielectric layers in the plurality of first sub-regions into loose structures along the first direction; performing graphical processing on the second region by adopting second laser, and modifying the dielectric layers in the plurality of second sub-regions into loose structures in sequence along the first direction; and removing the modified dielectric layer, the first doped conductive layer and the tunneling oxide layer in the second region. The preparation method can reduce the surface defects of the battery and can improve the conversion efficiency of the battery.

The invention provides a back contact solar cell and a solar cell module, the back contact solar cell comprises a silicon wafer and a grid line structure, and the grid line structure comprises main grid lines and fine grid lines connected with the main grid lines. The grid line structure comprises a plurality of middle grid line sub-structures arranged in the first direction, a first edge grid line sub-structure closest to the first edge and a second edge grid line sub-structure closest to the second edge. The distance between the center line of the main grid line of the first edge grid line substructure and the center line of the main grid line of the adjacent middle grid line substructure is larger than the distance between the center lines of the main grid lines of any two adjacent middle grid line substructures. The distance between the center line of the main grid line of the second edge grid line substructure and the center line of the main grid line of the adjacent middle grid line substructure is larger than the distance between the center lines of any two adjacent middle grid line substructures. The back contact solar cell solves the problem of damage caused by stress concentration at the edge of the cell.

The back surface of the solar cell is provided with metal grid lines located in a grid line area and alignment marks located in a non-grid line area. The solar cell further comprises a patterned passivation contact structure, the passivation contact structure only comprises a first area located in the grid line area and a second area located at the position where the alignment marks are formed, the metal grid lines are located in the first area, and the alignment marks are located in the second area. According to the utility model, the alignment mark is arranged on the second area of the non-grid line area, so that the contrast around the alignment mark can be increased, the point grabbing precision is improved, and good grid line alignment can be realized.

The invention relates to the technical field of solar cells, in particular to a back contact solar cell module and a preparation method thereof. The back contact solar cell module comprises a cell piece, a bus bar, a plurality of first polarity welding strips, a plurality of second polarity welding strips and an insulating film, wherein the bus bar, the plurality of first polarity welding strips, the plurality of second polarity welding strips and the insulating film are all arranged on the back surface of the cell piece. The first polarity welding strip and the second polarity welding strip are arranged on the back face of the battery piece in a staggered mode, the first polarity welding strip is electrically connected with the bus bar, and the insulating film can isolate the bus bar from the battery piece. The first polarity welding strip and the second polarity welding strip are arranged on the two sides of the insulating film respectively in the thickness direction of the battery piece. The bus bars are arranged on the back surfaces of the battery pieces, so that the space between the battery pieces is saved, the area utilization rate of the back contact battery assembly is improved, the length of the welding strip is shortened, and the collection efficiency of current is improved.

The invention relates to the technical field of solar cells, in particular to a film layer structure for improving UV attenuation of a TOPcon cell. In order to improve the passivation effect of the front face of the TOPCon cell, an aluminum oxide passivation layer is generally arranged on the surface of a BSG layer on the front face of the TOPCon cell, but the aluminum oxide passivation layer is poor in ultraviolet resistance and prone to being damaged by ultraviolet light, and then the service life of the cell is affected. Aiming at the problem, the invention provides the film layer structure for improving UV attenuation of the TOPcon battery, the second silicon oxide layer and the first silicon oxide layer are respectively arranged above and below the aluminum oxide layer, and the silicon nitride layer is arranged on the surface of the second silicon oxide layer, so that the passivation effect of the front surface of the obtained TOPcon battery is remarkably improved, the attenuation speed of the battery is effectively reduced, and the service life of the battery is prolonged. And the service life of the battery is prolonged.

The invention belongs to the technical field of solar power generation, and particularly relates to a back contact BC solar cell structure and a preparation method thereof. A tunneling SiO2 layer and a phosphorus-doped N + poly layer with high crystallization rate and low parasitic absorption are arranged in a back N region of the cell; the P region is sequentially provided with an i: a-Si layer, a P: a-Si sub-layer and a P-uc-SiOxCy sub-layer; the front surface of the cell is provided with a laminated gradient silicon nitride antireflection passivation film; the back N region adopts the SiO2 layer and the N + poly field structure with high crystallization rate and low parasitic absorption to replace an i: a-Si + N: a: Si field structure of a traditional HBC to improve the current density, and the back N region adopts the suede light trapping structure to replace a polishing structure to improve the current density. A low-temperature silicon nitride antireflection film is additionally arranged on the upper layer of the TCO transparent conductive film to improve passivation and current density, silicon nitride coverage antireflection is carried out on the isolation regions of the P region and the N region to improve passivation and current density, the back efficiency of the cell is improved, and the double-sided rate is improved.

The invention discloses a preparation method of a solar cell, and the method comprises the following steps: placing an N-type silicon wafer in a furnace tube of a diffusion furnace, and introducing nitrogen and oxygen into the furnace tube to form a first oxide layer on the surface of the silicon wafer; boron trichloride, oxygen and nitrogen are introduced into the furnace tube, so that a boron diffusion layer is formed on the surface, away from the silicon wafer, of the first oxide layer; introducing nitrogen into the furnace tube, and controlling the temperature of the furnace tube to be a first temperature so as to carry out oxygen-free propulsion of the boron element; introducing nitrogen and oxygen into the furnace tube, and controlling the temperature of the furnace tube to rise from the first temperature to a second temperature so as to carry out aerobic propulsion of the boron element; dry oxygen and wet oxygen are alternately introduced into the furnace tube for multiple times to form a second oxide layer; the temperature in the furnace tube is reduced, and dry oxygen continues to be introduced into the furnace tube; and nitrogen is introduced into the furnace tube, the temperature in the furnace tube is reduced, and boron diffusion of the silicon wafer is completed. According to the preparation method of the solar cell, the silicon wafer can have low surface concentration shallow junctions and uniform sheet resistance.

The invention provides a TOPCon battery metallization method, and relates to the technical field of solar cells, and the method comprises the following steps: providing a blue diaphragm; preparing a metal seed layer on one side of the blue membrane and then drying; preparing a metal seed layer on the other side of the blue diaphragm, and then drying or sintering; preparing main and auxiliary grids on the metal seed layer on one side and then drying, wherein the main and auxiliary grids are made of non-silver paste; and preparing main and auxiliary grids on the metal seed layer on the other side, and sintering to complete metallization of the battery piece. In the invention, the main grid and the auxiliary grid are made of the non-silver paste, and the non-silver paste is used for replacing traditional silver paste, so that the use amount of silver is greatly reduced, the cost of raw materials is reduced, the production cost of the TOPCon battery is reduced, the dependence on noble metal resources is relieved when the TOPCon battery is produced, and the requirement of sustainable development is better met.