517 results about "Copper electrode" patented technology

The invention discloses a wearable medical monitoring equipment electrode which is composed of a layered structure and comprises a transparent flexible substrate layer which is made of a biocompatible flexible polymer material and is used for providing flexible support and isolating a metal electrode from the skin; the metal grid copper transparent electrode layer is formed on the surface of the transparent flexible substrate layer through a yellow light etching micro-nano processing technology; the conductive gel layer uniformly covers the surface of the metal grid copper electrode layer; the encapsulation layer is formed by spin-coating a polymethyl methacrylate solution on the surface of the conductive gel layer and forming a transparent protection layer after curing; the gradient line width bionic honeycomb-shaped copper grid design is adopted, the light transmittance is kept, meanwhile, the collection efficiency of physiological electric signals is remarkably improved, signal transmission loss is reduced, through the polyacrylamide and nanocellulose composite gel formula and micro-channel dynamic humidity adjustment, signal stability under long-term wearing is ensured, and the application range is wide. The problem of signal distortion caused by dryness of traditional gel is solved.

The invention discloses a UV-CIPP material for pipeline repair and stress monitoring and a preparation method of the UV-CIPP material, and belongs to the technical field of intelligent materials. The preparation method comprises the following steps: respectively diluting MWCNT slurry according to a certain proportion; soaking the glass fiber in the dipping solution for a period of time, taking out and drying; coating two ends of the dried glass fiber with conductive silver adhesive, and pasting a copper electrode after curing; adding a thermal initiator into the ultraviolet curing resin; respectively preparing test pieces with different resin contents; and sequentially carrying out ultraviolet curing and thermocuring on the prepared test piece. The characteristics and advantages of the ultraviolet curing resin, the glass fiber and the resin material are combined, and the preparation problem of the ultraviolet curing composite material for repairing the intelligent pipeline, which does not influence the mechanical property of the material and can realize excellent monitoring capability, is solved.

The invention discloses a self-powered multifunctional wireless sensing system based on a wind energy friction nano-generator, which comprises a self-powered module, the self-powered module is provided with the wind energy friction nano-generator capable of generating alternating current, and the self-powered module comprises a supporting seat and a friction power generation assembly fixedly assembled on the supporting seat; the friction power generation assembly comprises a wind energy rotating mechanism, an FEP film sleeve layer, a first power generation copper electrode set and a second power generation copper electrode set, the first power generation copper electrode set and the second power generation copper electrode set are fixedly attached to the outer side of the fixing cylinder, and the FEP film sleeve layer is connected to the outer side of the first power generation copper electrode set and the outer side of the second power generation copper electrode set in a sleeving mode. The wind energy rotating mechanism is connected to the outer side of the FEP film sleeve layer in a sliding and sleeving mode. Two copper foil sheets are arranged in the wind energy rotating mechanism; the wireless sensing module is electrically connected with the first power generation copper electrode group, and the wired energy supply module is electrically connected with the second power generation copper electrode group. The friction nanometer generator can supply power to the wireless unit and the wired unit at the same time, and the utilization efficiency of the friction nanometer generator on wind energy is improved.

The invention relates to the technical field of photovoltaic cells, and provides copper electrode slurry, a metal electrode, a preparation method of the metal electrode and a photovoltaic cell. The copper electrode slurry comprises a metal composition, a dispersion reducing agent, a composite curing agent and an optional solvent, the metal composition at least comprises copper powder and optional gold powder and / or silver powder; the composite curing agent comprises thermosetting resin and a latent curing agent; wherein the mass ratio of the metal composition to the composite curing agent is (7-30): 1. The copper electrode paste provided by the invention replaces expensive silver paste, so that the manufacturing cost of a solar cell energy electrode is greatly reduced. According to the method for preparing the metal electrode, the position of the copper electrode can be precisely machined, damage to the amorphous silicon layer is avoided, remelting and solidification of the copper electrode are achieved through multiple times of laser scanning, and the problem that the adhesive force between the copper electrode and the substrate is poor is effectively solved.

The invention provides copper slurry and a preparation method thereof, a copper electrode, a solar cell and a photovoltaic module, and belongs to the technical field of conductive materials. The copper slurry comprises a dispersion medium and copper particles dispersed in the dispersion medium, the copper particles comprise first copper particles, second copper particles, third copper particles and fourth copper particles; the particle size range of the first copper particles is 1-10 [mu] m, the particle size range of the second copper particles is 500-999 nm, and the particle size range of the third copper particles is 101-499 nm; the first copper particles, the second copper particles and the third copper particles are elementary copper particles, and the fourth copper particles are cuprous hydride nanoparticles; at least part of the fourth copper particles are attached to the surfaces of the first copper particles and / or the second copper particles and / or the third copper particles. Therefore, the fourth copper particles are interconnected among the three copper particles, more transmission channels are provided, the wire resistance is reduced, and the conductivity is improved.

The invention relates to the technical field of electronic paste, in particular to copper electrode paste for an NTC thermistor and a preparation method and application of the copper electrode paste. A copper electrode slurry for an NTC thermistor comprises copper powder, an inorganic glass binder, an organic carrier and a dispersant, the inorganic glass binder comprises CuO and NiO, and the organic carrier comprises a polymer thickener. The copper electrode slurry can be coated on the surface of an NTC thermistor ceramic substrate through a silk-screen printing method, can be used as a metallized conductive layer after being sintered in nitrogen, is used for temperature measurement, temperature compensation, temperature control components and the like, and is wide in application. The copper electrode slurry for the NTC thermistor provided by the invention can be sintered in nitrogen at 550-650 DEG C, and has the advantages of wide sintering interval, good sintering appearance, excellent welding performance and strong adhesive force. After sintering, the ohmic contact is good, so that the prepared NTC thermistor can truly reflect the resistance value of a substrate, and the phenomenon of ion migration is avoided.

The invention relates to a hydrophilic and hydrophobic controllable magnetorheological rubber-foam metal bearing which is characterized in that a magnetorheological rubber-foam metal shaft sleeve is uniformly divided into n arc-shaped section units along the circumferential direction, and i water film sensors are arranged in each arc-shaped section unit along the axial direction of the magnetorheological rubber-foam metal shaft sleeve, two copper electrodes are led out from two ends of each water film sensor; j electromagnetic coils are arranged outside each arc-shaped section unit in the axial direction of the magnetorheological rubber-foam metal shaft sleeve, the two poles of each electromagnetic coil are fixed to the periphery of the magnetorheological rubber-foam metal shaft sleeve, gaps between the adjacent electromagnetic coils and the bearing shell are filled with iron blocks, and the iron blocks and the electromagnetic coils form a magnetic flux loop; the problems that due to the fact that the shaft sleeve material performance and the interface lubricating state of a traditional rubber bearing cannot be adjusted, the bearing capacity of a water-lubricated rubber bearing is insufficient, the hydrophilicity and hydrophobicity of a lubricating interface cannot be adjusted, noise reduction and abrasion resistance are insufficient, and performance improvement of a rubber sliding bearing is limited are solved.

The invention relates to an electric heating anti-icing multi-layer structure based on a copper-clad PI film and graphene. The electric heating anti-icing multi-layer structure sequentially comprises a surface insulating layer, an adhesive film layer, a graphene heating layer, an adhesive film layer and a surface insulating layer, and the graphene heating layer is provided with a copper-clad PI film layer. The method comprises the following steps: etching a copper foil on a polyimide film to obtain an etched copper electrode film; the preparation method comprises the following steps: uniformly dispersing graphene and polyimide resin through vacuum stirring, coating the surface of a polyimide electrode film with the graphene and polyimide resin through a tape casting method, and performing high-temperature curing to obtain a graphene heating layer with smooth appearance and uniform sheet resistance; and molding the heating layer and the composite material through an autoclave to obtain the wing-shaped electric heating anti-icing assembly.

The utility model discloses a clamp for prolonging the service life of a vacuum resistance evaporation boat, which comprises two water-cooled copper electrode bars, the tops of the two water-cooled copper electrode bars are fixedly connected with lower copper clamps, and the interiors of the lower copper clamps are connected with upper copper clamps in a sliding manner. When in use, the two water-cooled copper electrode bars are used as electrodes, the water-cooled copper electrode bars are fixedly provided with the clamps to clamp the two ends of the resistance boat, after voltage is applied to the two water-cooled copper electrode bars, current flows through the resistance boat, and the resistance boat is heated by means of the high resistance characteristic of the resistance boat; when the resistance boat is in use, a temperature change area can be transferred from the resistance boat to the transition block, the transition block has enough thickness, so that the temperature change is much slower than that of a very thin resistance boat, the transition block cannot be broken due to the temperature change, and due to the existence of the transition block, all parts on the resistance boat do not have large temperature difference, so that the resistance boat is more stable in temperature change. And the service life is greatly prolonged.

The utility model discloses a welding device and a welding system. The welding device comprises a welding gun; the electrode assembly comprises a first electrode and a second electrode, and the second electrode is suitable for being connected with the welding gun; the positioning block is connected with the first electrode; the correction assembly is suitable for being arranged between the first electrode and the second electrode, the correction assembly comprises a copper electrode, a to-be-welded part is arranged on the copper electrode, the contact end of the first electrode is suitable for being in surface contact with the copper electrode, and the contact end of the second electrode is suitable for being in surface contact with the to-be-welded part. According to the welding device, the end face of the electrode is enlarged, indentations are reduced, the appearance quality problems of welding spot distortion and too deep indentations on the appearance face in the existing manual resistance spot welding process are solved, the situation that the welding spot is distorted due to the fact that the electrode assembly is difficult to be perpendicular to the plane of the piece to be welded is avoided, and the appearance quality of the welding spot is optimized.

The invention discloses a method for prolonging the service life of a resistance spot-welding electrode, a manufactured resistance spot-welding electrode cap and application, and the method comprises the following steps: taking a chromium-zirconium-copper electrode cap as a base body, grinding the working surface of the base body step by step by adopting abrasive paper, and then sequentially polishing, ultrasonically cleaning and drying to obtain a pretreated base body; performing vacuum zirconium permeation treatment on the pretreated matrix by adopting a permeation agent so as to form a zirconium-rich solid solution diffusion layer in the pretreated matrix, thereby obtaining the matrix subjected to zirconium permeation reinforcement; physical vapor deposition treatment is adopted, and a metal transition layer is deposited on the surface of the solid solution diffusion layer of the matrix subjected to zirconium permeation strengthening; wherein the metal transition layer is a Cr transition layer or a Ti transition layer; and a graphite target and titanium target co-sputtering mode is adopted, and a composite gradient functional layer is sputtered and deposited on the surface of the metal transition layer of the matrix treated in the step S3. The electrode service life of the method is improved by magnitude order, and the effect is extremely remarkable.

The invention provides a film-coated copper sheet for interconnection of copper electrodes on the front side of a chip and a preparation method and application of the film-coated copper sheet. The preparation method comprises the following steps: S1, carrying out surface treatment and single-side metallization treatment on a bare copper sheet to obtain a copper sheet with a single-side metallization layer; s2, the single-face metallization layer of the copper sheet is coated with metal soldering paste, drying is conducted in an inert or reducing atmosphere, and the copper sheet with a pre-sintered metal film is obtained; s3, cleaning, drying and activating the copper sheet to obtain an activated copper sheet; and S4, coating the activated copper sheet with a coating solution, and curing after coating to obtain the film-coated copper sheet for interconnection of the copper electrodes on the front surface of the chip. According to the preparation method, the dried metal soldering paste can be protected, sufficient adhesive force can be provided for the film-coated copper sheet and the chip in the sintering process, dispensing fixation is avoided, the packaging cost is reduced, and the service reliability of a packaged device is improved.

The application belongs to the technical field of hydrogen production by ammonia decomposition, and discloses an electrically-assisted low-temperature hydrogen production method by ammonia decomposition, characterized by comprising the following steps: S1, preparing a reactor; the reactor comprises a quartz tube, two pieces of foam copper are installed in the quartz tube, a catalyst is filled between the two pieces of foam copper, each piece of foam copper is connected with a copper electrode, and two thermocouples are installed in the quartz tube and extend into the catalyst; S2, preparing the catalyst; S2.1, the catalyst is synthesized by a solution combustion method, and the precursors of the components of the catalyst are respectively Ni(NO3)2·6H2O, Co(NO3)2·6H2O, Fe(NO3)3·9H2O, Ce(NO3)3·6H2O and Zr(NO3)4·5H2O; and S3, introducing ammonia into the reactor to produce hydrogen; compared with the prior art, the application applies the electric field-assisted catalysis technology to the field of hydrogen production by ammonia decomposition, and develops a catalyst suitable for the electric field-assisted hydrogen production by ammonia decomposition.

The invention discloses a focusing type acoustic streaming heat dissipation device facing a chip. The device belongs to the crossing field of ultrasonic technology and heat dissipation technology and is composed of a piezoelectric stack, an acoustic lens, a splitter plate, a base, a supporting rod, a copper electrode and the like. According to the device, geometric parameter configuration of the splitter plate, the piezoelectric stack and the acoustic lens is optimized, and a double-piezoelectric-plate stacked structure is adopted to enhance the ultrasonic resonance effect; high-frequency alternating voltage is applied to the copper electrodes at the two ends of the piezoelectric stack, high-frequency sound waves are excited through the inverse piezoelectric effect, and after the sound waves are focused through the sound lens, a gradient sound pressure field is formed in a cavity formed by the splitter plate and the piezoelectric stack; air molecules are driven to move directionally based on the acoustic streaming effect, so that air flow at an air inlet is accelerated by sound pressure to form high-flow-rate focusing jet flow at an air outlet, and targeted forced convection heat dissipation of a chip heat source is realized. According to the device, the ultrasonic technology and the heat dissipation technology are combined, the whole device is simple in structure, free of moving parts and low in noise, and various heat dissipation requirements can be met in an array mode.

The invention relates to a fingerstall based on an ionic gel pressure sensor array and a preparation method. The fingerstall comprises a flexible fingerstall body and a flexible pressure sensor array main body fixedly embedded in the inner side of the flexible fingerstall body. The flexible pressure sensor array main body comprises a top flexible electrode layer, an ionic gel layer and a bottom flexible electrode layer which are arranged in sequence; the ionic gel layer is located between the top flexible electrode layer and the bottom flexible electrode layer, the top flexible electrode layer and the bottom flexible electrode layer are each composed of a polyimide film layer and a copper electrode, and the polyimide film layers and the copper electrodes are tightly attached and fixedly connected; the copper electrodes of the top flexible electrode layer and the bottom flexible electrode layer are formed by arranging and connecting a plurality of copper electrode units in a matrix manner; the copper electrode units of the top flexible electrode layer are connected in rows, the copper electrode units of the bottom flexible electrode layer are connected in columns, and the copper electrode connection directions are vertical after the two layers are assembled; one side, close to the top flexible electrode layer, of the ionic gel layer is provided with a uniform pyramid microstructure. According to the invention, the force of the finger acting on the pricking needle can be accurately obtained.

The embodiment of the invention relates to the photovoltaic field, and provides a cyanide-free electroplating silver-coated copper conductive material, a preparation method thereof and a crystalline silicon solar cell. The silver-coated copper electrode provided by the embodiment of the invention comprises a copper core and a copper-tin alloy electroplated layer coated on the surface of the copper core, the surface of the pre-plating material is coated with the silver electroplating layer; the surface of the silver-coated copper material is coated with the self-repairing layer; wherein the self-repairing layer comprises a resin film and a pH response type microcapsule, the microcapsule is embedded in the resin film, and the microcapsule is filled with an ammonium molybdate corrosion inhibitor. The copper-silver interface bonding force can be improved through the copper-tin alloy electroplated layer, and the silver layer material does not contain cyanogen and is environmentally friendly; the corrosion inhibitor in the pH response type microcapsule in the self-repairing film layer on the surface of the silver layer is released under a specific pH condition to form a protection film on the silver layer again, so that the self-repairing purpose is achieved, and the dynamic protection effect is achieved.

The invention belongs to the field of flexible sensors, and particularly relates to a flexible sensor prepared from a self-powered piezoelectric nanofiber membrane, and in addition, the prepared sensor also has a human physiological signal acquisition function. The sensor is composed of silicone rubber (Ecoflex 00-30), a polyvinylidene fluoride (PVDF) nanofiber membrane and a copper electrode. As the polyvinylidene fluoride nanofiber membrane prepared by the electrostatic spinning technology is nanoscale, certain surface roughness can be increased when the polyvinylidene fluoride nanofiber membrane is attached to the surface of the silicone rubber, the output performance of the sensor is improved, and meanwhile, due to the hydrophobic property of the polyvinylidene fluoride nanofiber membrane, the sensor can be used for detecting the surface roughness of the silicon rubber. When external energy is collected, the friction loss between a solid friction surface and external liquid is greatly reduced, so that the service life of the sensor is prolonged; finally, by testing the sensor, it is found that the sensor has huge potential in the application field of external energy collection and human physiological signal collection.

The invention discloses a preparation method of a TCO film with good electroplate liquid corrosion resistance, which comprises the following steps: weighing ABCD powder according to the mass percentage, mixing the ABCD powder, grinding, carrying out compression molding, carrying out cold isostatic pressing molding, sintering in a high-temperature atmosphere and the like to obtain a target material, and carrying out sputtering coating by using the target material through a direct-current magnetron sputtering coating machine to obtain the TCO film. The TCO thin film prepared by the method has good electroplate liquid corrosion resistance, low resistivity and good conductivity, the sheet resistance of the thin film is only slightly increased and the transmittance is only slightly reduced after the thin film is soaked for 10 minutes, and the TCO thin film shows excellent electroplate liquid corrosion resistance, is used as an electrode material of a novel crystalline silicon heterojunction solar cell and has good application prospects. The TCO thin film electroplating copper electrode is used for replacing a traditional silk-screen printing silver paste electrode, complete silver removal is achieved, and the non-silicon cost of a heterojunction cell is reduced.

The invention relates to an ultrasonic-assisted longitudinal-torsional compound vibration two-roller rolling device, and belongs to the technical field of ultra-thin strip rolling. According to the device, the ultrasonic longitudinal-torsional vibration device is combined with the rolling mill, so that the deformation resistance of materials is effectively reduced, the surface roughness is improved, grains are refined, and the residual stress is reduced by utilizing ultrasonic vibration. The device comprises a rolling mill rack, an ultrasonic longitudinal-torsional vibration device, a winding device, a winding assisting device and an unwinding device. The ultrasonic longitudinal-torsional vibration device is composed of a variable-amplitude roller shaft, a connecting shaft, piezoelectric ceramics, a copper electrode, a rear cover plate and a hexagon socket screw, and has a single-excitation form and a double-excitation form. The single excitation device adopts a quarter-wavelength conical amplitude-change pole, a spiral groove is formed in the conical surface of the quarter-wavelength conical amplitude-change pole, and longitudinal vibration can be partially converted into torsional vibration; according to the double-excitation device, the torsional vibration amplitude is increased through cooperation of two longitudinal-torsional amplitude-change poles which are symmetrically arranged. The device is compact in structure, small in energy loss, high in machining precision and suitable for production of high-precision ultra-thin strips.

The utility model provides a contact resistance thermal printing head, and belongs to the technical field of additive manufacturing. A pressure sensor is arranged at the upper end of the printing head, a copper electrode compresses a spring in the printing process, the spring transmits pressure to the pressure sensor, the pressure sensor transmits pressure information to a controller, the controller outputs a control signal to a pressure motor, and the pressure motor pushes a sliding block to move, so that the compression amount of the spring is changed; the spring pushes the copper electrode of the printing head to be directly pressed on the metal raw material, and stable pressure control in the printing process is achieved. A copper electrode tip in the printing head is connected with an alternating power supply, the alternating power supply is connected with the printing head, the metal raw material and the substrate through wires to form a closed loop, and contact resistance thermal printing is achieved.

The invention belongs to the technical field of semiconductors and solar cells, and discloses a preparation method of a low-cost electroplating copper grid line heterojunction solar cell. In order to solve the problems that the cost is high when a metal electrode in a heterojunction solar cell is prepared through traditional screen printing low-temperature paste, and efficiency improvement is limited due to the fact that a narrower grid line is difficult to prepare in a screen printing mode, in-situ pretreatment is carried out on an N face to carry out surface roughening; then, copper electroplating is carried out in a light-induced horizontal electroplating mode to prepare an N-face copper electrode; and then turning over the battery piece to carry out P-surface copper electroplating so as to prepare the heterojunction solar battery with double-surface copper-electroplated grid lines.

The invention discloses a low-temperature safety valve leakage detection device based on electrical capacitance tomography, which comprises a liquid nitrogen storage container, a test container, a low-temperature stop valve, a detected low-temperature safety valve, a constant-temperature water bath device, a flow meter, a water tank, a leakage detection pipeline, a capacitance measurement system and a data acquisition and software system, the capacitance measuring system comprises a plurality of groups of copper electrode plates and a processing module, each group of copper electrode plates comprises two copper electrode plates arranged on two opposite side parts of the water tank, and the copper electrode plates are used for capturing bubbles formed by the low-temperature gas in the cavity and acquiring capacitance signals; and the copper electrode plate is electrically connected with the data acquisition and software system through the lead electrode plate connector and the shielding coaxial cable. Insulation supports are arranged between the water tank and the copper electrode plates, the interior of the water tank is divided into a plurality of cavities, and communication gaps are formed between the adjacent cavities. The invention further discloses a low-temperature safety valve leakage detection method based on electrical capacitance tomography. According to the method, the accuracy and comprehensiveness of calculating the leakage rate of the low-temperature gas are improved.

The invention discloses a preparation method of a high-temperature superconducting wire strip with high strength, high shunt and high heat-conducting property. The method comprises the following steps: 1, cleaning a semi-finished superconducting wire strip; 2, putting the cleaned semi-finished superconducting wire strip serving as a cathode and a copper electrode serving as an anode into copper sulfate electroplating liquid, and connecting with a direct-current power supply to form an electroplating device; and 3, after electroplating the cathode semi-finished superconducting wire strip, taking out the cathode semi-finished superconducting wire strip and staying in the air, and forming an electroplated layer of nano-scale copper grains by a process of repeatedly electroplating and taking out for multiple times, thereby obtaining the high-temperature superconducting wire strip. According to the invention, the surface of the semi-finished superconducting wire strip is plated with the electroplated layer of the nano-scale copper crystal grains through electroplating, and the high-temperature superconducting wire strip has high strength, high shunting and high heat-conducting properties by utilizing the strong pinning characteristic of the nano-copper crystal grains and the intrinsic high electric conductivity and high heat-conducting characteristics of copper, resists Lorentz force in a strong magnetic field, and has the characteristics of high conductivity and high heat conductivity. And the shunting and heat conduction capabilities of the high-temperature superconducting wire strip after quenching are improved, the process is simple, and industrial production is easy.

The invention discloses a T-type thermocouple and an electrochemical spray deposition manufacturing method thereof. The method comprises the steps of depositing a copper inclined column, replacing electroplating liquid, depositing a copper inclined column and combining the inclined columns. Additive manufacturing of the constantan electrode and the copper electrode in the T-type thermocouple is completed through the electrochemical spray deposition process, the thermocouple with the wire diameter within hundred micrometers can be manufactured, the technical problem that in the prior art, the thermocouple with the scale is difficult to machine is effectively solved, and application and popularization are facilitated.

The invention discloses a UV-CIPP material for pipeline repair and intelligent water level monitoring and a preparation method of the UV-CIPP material, and belongs to the technical field of ultraviolet curing pipeline repair. The preparation method comprises the following steps: selecting a proper amount of MWCNTs solution; the woven glass fibers are put into the dipping solution to be soaked; coating a conductive silver adhesive on the woven glass fiber, and pasting a copper electrode; adding a thermal initiator into the ultraviolet curing resin; pouring the resin into a mold, and laying woven glass fibers; and carrying out ultraviolet light curing and thermocuring on the prefabricated member. By introducing the MWCNTs impregnated woven glass fiber sensing layer and adopting ultraviolet light / heat dual curing, the intelligent pipeline composite material with ultrahigh strength and ultrahigh sensing capacity is formed, and the change of the water level in a pipeline can be monitored in real time while the pipeline is repaired.

The invention relates to the technical field of photovoltaic cells, and provides a solar cell and a preparation method thereof, the solar cell comprises a silicon substrate and a transparent conductive film, the transparent conductive film is provided with a periodic nanostructure array, and the solar cell also comprises a metal electrode arranged on the surface of the transparent conductive film, the metal electrode is prepared by adopting copper electrode slurry and a laser process. The periodic nanostructure array modified layer is prepared on the conductive thin film, so that the surface area and the conductivity of the transparent conductive thin film can be increased, the absorption and reflection of the transparent conductive thin film to light are improved, and the efficiency of the solar cell is improved; and the binding force of the electrode can be increased, and the durability and the stability of the solar cell are improved. According to the preparation method of the solar cell provided by the invention, the position of the copper electrode can be precisely processed, the problem of precision of current silk-screen printing is solved, the damage to the amorphous silicon layer can be avoided, the prepared copper electrode has a relatively large height-width ratio, and the light conversion efficiency can be effectively improved.

The invention belongs to the technical field of silicon solar cells, and particularly relates to a copper electrode material and a method for preparing a copper electrode of a silicon solar cell by using the copper electrode material, the copper electrode material comprises the following components: a copper wire, a tin-bismuth alloy and modified rosin, and the preparation method of the modified rosin comprises the following steps: firstly, taking polyethylene glycol and aniline phenylacetic acid as raw materials; carrying out esterification reaction to obtain aniline modified polyethylene glycol; then, rosin and acrylic acid are used as raw materials, and acrylic acid modified rosin is obtained through a D-A addition reaction; and finally, by taking aniline modified polyethylene glycol and acrylic acid modified rosin as raw materials, carrying out esterification reaction. The invention also provides a method for preparing a silicon solar cell copper electrode by using the copper electrode material. The surface of a copper wire is sequentially coated with a modified rosin layer, a tin-bismuth alloy layer and a modified rosin layer. The copper electrode provided by the invention has relatively low bulk resistance and relatively good oxidation stability, and also has excellent adhesive force and relatively low interface contact resistance when the copper electrode is fused and welded on the surface of a substrate.

A dissimilar steel resistance spot welding process based on differentiated electrode parameter optimization belongs to the field of welding technology. Carbon steel and stainless steel plates are assembled and fixed on a fixture in an overlapping manner as workpieces. Chromium-zirconium-copper electrodes are selected as welding electrodes. The electrode end face diameter is 5mm to 9mm, and the electrode end face diameter on the carbon steel plate side is smaller than the electrode end face diameter on the stainless steel plate side. The electrode end face is fully contacted with the workpiece surface and pre-pressed. Welding is performed using resistance spot welding. During welding, the electrode pressure is 7kN to 10kN, the welding current is 7kA to 10kA, and the welding time is 0.2s to 0.4s. After the power is turned on, the current is removed, and the electrode pressure is maintained to allow natural cooling. At this point, the dissimilar steel resistance spot welding of carbon steel and stainless steel plates is completed. By using electrodes of different sizes on the stainless steel and low-carbon steel sides, the present invention effectively controls the nugget offset and nugget size, thereby improving the quality and stability of spot welding.

The invention relates to the technical field of thermoelectric conversion, solves the technical problems of bending strength, stretchability and the like of an existing flexible thermoelectric device, and particularly relates to a flexible thermoelectric unit based on a thermoelectric thick film, a thermoelectric device and a preparation method of the flexible thermoelectric unit. A group of thermoelectric channels are obtained by combining a thermoelectric thick film material and a slotted copper electrode, heating, welding and curing are performed to obtain a group of thermoelectric channels, a plurality of groups of thermoelectric channels are connected in parallel and inserted by using a connecting electrode to form a flexible thermoelectric unit with a three-dimensional framework, and the flexible thermoelectric unit is integrally placed into a pouring mold after connection and is packaged into a flexible thermoelectric device by a flexible packaging material. The temperature difference between the cold end and the hot end is easy to establish, and excellent bendability and reliability are achieved. Theoretical calculation shows that the flexible thermoelectric device has the stretch rate of about 51%, and the maximum output power under the temperature difference of 200K is 0.126 mW. Compared with an existing flexible thermoelectric device, the flexible thermoelectric device has the advantages of being simple in preparation method process, good in bending and stretching effect, low in cost and the like, and batch preparation can be achieved.

The invention provides an LTCC raw material belt with a high thermal expansion coefficient, an LTCC substrate and a preparation method of the LTCC substrate, the LTCC raw material belt with a smooth surface and a uniform thickness is obtained through tape casting by adjusting the proportion of silicon dioxide ceramic powder, MgTiO3 ceramic, SrTiO3 ceramic, Li2MgSiO4 ceramic, BCBS, ZABS and LASP microcrystalline glass powder, the LTCC raw material belt is sintered in a nitrogen furnace at 880-940 DEG C for 1-3 h, and the LTCC raw material belt can be co-fired with low-cost copper electrode slurry to be flat and tightly attached to the low-cost copper electrode slurry. The LTCC substrate with the thermal expansion coefficient larger than 11 ppm / DEG C is prepared, under the test frequency of 5 GHz, the dielectric constant of the LTCC substrate ranges from 5.1 to 6.1, the dielectric loss ranges from 0.0025 to 0.004, the bending strength ranges from 170 MPa to 230 MPa, the thermal expansion coefficient at the temperature ranging from 30 DEG C to 400 DEG C ranges from 11.0 ppm / DEG C to 13.0 ppm / DEG C, and acid resistance is good.