74results about How to "Low conductivity" patented technology

The invention relates to a composite positive active material and a preparation method thereof, a positive pole piece and a secondary battery. The composite positive electrode active material comprises a positive electrode active material substrate, a porous metal oxide coating layer arranged on the surface of the positive electrode active material substrate and a conductive polymer coating layer arranged on the surface of the porous metal oxide coating layer. In the composite positive electrode active material, the electrochemical inert porous metal oxide coating layer has good thermal stability and is beneficial to stabilization of a crystal structure and inhibition of surface side reaction, and in addition, the porous structure is beneficial to transmission of lithium ions and storage of oxygen free radicals separated out due to structural collapse of a positive electrode active material matrix in the overcharge process; severe reaction with electrolyte is relieved, and overcharge failure of the positive electrode active material is slowed down. The conductive polymer coating layer can make up the electrochemical inertness of the metal oxide and improve the electronic conductivity of the positive electrode active material.

The invention provides a conductive structure which can save space and can restrain reduction of conductive performance in a use state. A conductive structure (1) is provided with a holding member (2) that is a conductive member that is annular about an axis (x), and a conductive member (3) that is an annular member about the axis (x). The electrically conductive component (3) has at least one radially extending gap (10) and at least one electrically conductive body (20) extending about an axis (x). The conductive member (3) is held by the holding member (2). The conductor (20) has a pair of end portions (20a, 20b) in the direction around the axis (x). The gap (10) is connected to the ends (20a, 20b) of the conductor (20).

The purpose of the present invention is to provide an aluminum alloy for die casting, which has excellent thermal conductivity and is suitable for die casting, and to provide an aluminum alloy for die casting, which has excellent electrical conductivity, corrosion resistance and strength and is also suitable for die casting. The purpose of the present invention is also to provide a method for producing a die casting material in which a recycled material can also be used as a starting material. The aluminum alloy material is characterized by containing, in mass%, 0.4 to 2.0% of Fe, 0.1 to 0.8% of Si, and 0.1 to 1.0% of Mg, with the remainder being Al and unavoidable impurities.

The invention relates to a cable structure optimization design method and device and computer equipment. The method comprises the following steps: acquiring cable structure data of a cable, and core structure information and physical performance information of each filling core, constructing a cable structure model of the cable based on the cable structure data to simulate a current transmission process so as to obtain simulation structure data of the cable, and constructing a cable structure model of the cable based on the simulation structure data of the cable, the position information of each hollow core of the cable is identified, so that the cable structure model is adjusted, a cable core structure model of each filling core is obtained, and target cable structure data of the cable is identified based on core structure simulation data of each cable core structure model and core structure experiment data of each cable core structure model. By adopting the method, the resource optimization effect of designing the cable conductor structure can be improved.

The invention relates to a composite microsphere for enhancing the antibacterial performance of baicalin as well as a preparation method and application of the composite microsphere, and relates to the technical field of biological materials. The composite microsphere comprises zein and baicalin, wherein the baicalin is embedded into the hydrophobic interior of the zein. The composite microspheres can reduce the minimum inhibitory concentration of the baicalin and the cell membrane conductivity of the baicalin, and enhance the biological membrane clearance rate of the baicalin and the DNA inhibition effect of the baicalin, so that the antibacterial property of the baicalin is improved, and the composite microspheres have wide application prospects in the industries of biological materials and the like.

The invention provides a conductive filler and a preparation method thereof, and particularly, the conductive filler is formed by mixing a carbon material and a Ga-based liquid metal alloy, or is formed by mixing the carbon material, the Ga-based liquid metal alloy and metal powder. The invention also provides a conductive adhesive containing the conductive filler. The conductive adhesive disclosed by the invention has the characteristics of low cost, high conductivity (controllable conductivity), high bonding strength and the like, has good wettability on battery pieces, and can remarkably reduce the production cost and the contact resistance between the battery pieces as a connecting material of a photovoltaic module.

The invention discloses a composite material containing porous carbon and sodium ferric sulfate as well as a preparation method and application of the composite material, the composite material comprises the porous carbon and the sodium ferric sulfate, the porous carbon is used as a carrier, and the sodium ferric sulfate is distributed on the outer surface and in pores of the porous carbon. The preparation method of the composite material comprises the following steps: firstly, uniformly mixing an iron-containing compound, a sodium-containing compound, a sulfate radical-containing compound and a solvent to obtain a first material flow; and uniformly mixing with porous carbon to obtain a second material flow, and further drying and roasting to obtain the composite material. According to the method disclosed by the invention, the composite electrode material with high rate performance can be obtained, and the composite material has relatively high energy density and power density when being applied to a sodium ion capacitor and a sodium ion battery.

The present application relates to the technical field of lithium-ion battery fire extinguishing agents, and in particular to a lithium-ion battery water-based fire extinguishing agent and a preparation process. According to mass parts, the lithium-ion battery water-based fire extinguishing agent includes 70 to 80 parts of water, 25 to 35 parts of starch-grafted ammonium phosphate-montmorillonite complex, 15 to 25 parts of polyols, 5 to 10 parts of saponin, 3 to 5 parts of potassium perfluorobutyl sulfonate, 10 to 15 parts of diethylene glycol monobutyl ether, 3 to 5 parts of N, N-diethyl-1,3-propylenediamine, 4 to 6 parts of nano-silicon dioxide, and sodium carboxymethyl cellulose, wherein the sodium carboxymethyl cellulose is 5 to 7% of the mass of the starch-grafted ammonium phosphate-montmorillonite complex; the starch-grafted ammonium phosphate-montmorillonite complex includes starch, montmorillonite, ammonium phosphate, ammonium persulfate, ethyl acetate and sodium dodecyl sulfate. The embodiment of the present application provides a lithium-ion battery water-based fire extinguishing agent and a preparation process to solve the problem of electric shock risk and re-ignition risk when the water-based fire extinguishing agent extinguishes the lithium-ion battery in the related art.

The invention discloses a hot rolled steel coil for a supercritical carbon dioxide conveying pipeline and a production method of the hot rolled steel coil. The steel coil comprises the following chemical components in percentage by weight: 0.03 to 0.05 percent of C, 0.10 to 0.30 percent of S i, 1.20 to 1.40 percent of Mn, less than or equal to 0.010 percent of P, less than or equal to 0.002 percent of S, 0.030 to 0.050 percent of Nb, 0.005 to 0.020 percent of T i, 0.20 to 0.40 percent of Cr, 0.10 to 0.25 percent of N i, 0.020 to 0.050 percent of Al and the balance of Fe and inevitable impurities. The Nb-Ti-Cr-Ni alloy components and the TMCP rolling technology are adopted, the thickness of a steel coil is 10-15 mm, the steel coil has good strength, low-temperature toughness and carbon dioxide corrosion resistance, the impact energy at the temperature of-60 DEG C is larger than 300 J, the corrosion rate is smaller than 0.125 mm / a, and the requirement for the steel for the supercritical carbon dioxide conveying pipeline is completely met.

The embodiment of the utility model provides a cylindrical battery monomer, a battery, a power utilization device and a lining, and belongs to the technical field of batteries. The cylindrical battery cell comprises: a liner comprising a cylindrical tubular net structure woven by wires; and the winding battery core is wound outside the lining. Through the arrangement of the lining and the shape design of the cylindrical pipe type net structure, the problem of collapse of the central hole of the winding battery cell is effectively improved by adopting the structure, and the purpose that the lining supports the central hole of the winding battery cell is achieved, so that continuous deterioration of the collapse situation of the central hole in a cycle period is inhibited, the weight of the lining is reduced, and the service life of the winding battery cell is prolonged. Therefore, the energy density of the cylindrical battery monomer is improved, the overall miniaturization and lightweight design is realized, the surface of the lining has no convex structure, and the influence of the lining on the winding battery cell is reduced as much as possible.

The invention relates to the technical field of electrical switches, and discloses an operating mechanism of a strip-shaped disconnecting switch, which comprises a shell, a plurality of contacts are arranged in the shell, a push plate is slidably mounted in the shell, and a plurality of main knife switches are arranged on the push plate. A rotating shaft and a clamping piece are matched to compress a spring and enable a second supporting piece to rotate, meanwhile, movement of the rotating shaft can drive a pull plate to move so as to drive a push plate to conduct opening and closing, and when the rotating shaft swings towards the other side through a critical point of rotation of the second supporting piece, the compressed spring releases energy, and therefore opening and closing are conducted. When the opening and closing speed is increased, the distance between the contact and the main knife switch is increased more within the same time, so that the electric arc is lengthened quickly, the electric arc is extinguished more easily, and the arc extinguishing effect is improved.

The present application relates to the field of infrared light measurement, and specifically provides an infrared light detection device based on semi-metallic materials and a preparation method thereof. The device includes a substrate, a semi-metallic material layer is provided on the substrate, and electrodes and a polymer material layer are provided on the surface of the semi-metallic material layer away from the substrate. The electrodes are provided at both ends, and the polymer material layer is provided between the two electrodes, and the polymer material layer is not in contact with the electrodes. The present application also provides a preparation method for an infrared light detection device based on a semi-metallic material, and the method includes the following steps: step one, depositing a semi-metallic material layer on the surface of the substrate; step two, spin coating a polymer material layer on the surface of the semi-metallic material layer; step three, preparing electrodes on both ends of the polymer material layer on the semi-metallic material layer. In the device of the present application, the polymer material layer plays a role of thermal isolation, so that the temperature of the semi-metallic material layer is reduced, thereby improving the conductive performance and the detection accuracy is higher.

The present application relates to the field of lithium battery technology, and discloses an electrode assembly and an electrochemical device and an electronic device containing the same. The electrode assembly includes an anode electrode piece, a cathode electrode piece and a separator. The cathode electrode piece includes a cathode current collector and a first cathode covering layer arranged in a straight area of ​​the cathode current collector and a second cathode covering layer in a corner area. The conductivity of the second cathode covering layer is lower than the conductivity of the first cathode covering layer; or, the porosity of the corner area of ​​the separator is smaller than the porosity of its straight area. The electrode assembly of the embodiment of the present application improves the situation of lithium precipitation in the corner by optimizing the corner area of ​​the separator and / or the corner area of ​​the cathode electrode piece. Moreover, the present application only optimizes the corners, which will not have a significant impact on the overall performance of the battery cell.

The application relates to a silicon-carbon composite material and a preparation method thereof, a negative active material, a negative electrode sheet, a secondary battery and an electric device. The silicon-carbon composite material comprises porous carbon and a zinc silicate-silicon-oxygen-carbon composite material; at least part of the zinc silicate-silicon-oxygen-carbon composite material is filled in the pores of the porous carbon; the zinc silicate-silicon-oxygen-carbon composite material is of a porous structure; the pore diameter of the zinc silicate-silicon-oxygen-carbon composite material is 1-5 nm; and the mass content of zinc elements in the zinc silicate-silicon-oxygen-carbon composite material is 1-6%. The zinc silicate-silicon-oxygen-carbon composite material has proper pore diameter and zinc element content, is good in structural stability, and has low volume expansion rate and good conductivity. Since part of the zinc silicate-silicon-oxygen-carbon composite material is filled in the pores of the porous carbon, the volume expansion of the silicon-carbon composite material is further buffered. In the electrochemical cycle process, the silicon-carbon composite material has low volume expansion, and the cycle stability of the secondary battery can be improved.

A fast-response temperature and humidity sensor includes a humidity-sensitive material, a cylindrical frame disk, a temperature sensor, and an MCU with on-chip ROM. The frame disk has multiple deep-groove air channels evenly distributed around its perimeter. The frame disk has a socket for fixing the temperature sensor, which is electrically connected to the microcontroller. The temperature sensor measures the ambient temperature around the temperature and humidity sensor, and the MCU performs temperature correction on the humidity measurement value. The MCU's on-chip ROM stores a standard database containing multiple humidity-sensitive resistance (R)-humidity (H) curves of the fast-response temperature and humidity sensor at different temperatures (T). Based on the measured temperature value (T) and resistance value (R), the MCU looks up the corresponding humidity value (H) in the standard database.

The present disclosure relates to integrated assemblies including hydrogen diffused within two or more different semiconductor materials and methods of forming integrated assemblies. Some embodiments include an integrated assembly having a first semiconductor material between two regions of a second semiconductor material. The second semiconductor material is a different composition than the first semiconductor material. Hydrogen diffuses within the first and second semiconductor materials. The conductivity of the second semiconductor material increases in response to the hydrogen diffused therein to thereby create a structure having the second semiconductor material as a source / drain region and having the first semiconductor material as a channel region between the source / drain regions. A transistor gate is adjacent the channel region and is configured to induce an electric field within the channel region. Some embodiments include methods of forming an integrated assembly.

The invention is suitable for the technical field of conductive slurry preparation, and provides a conductive slurry stirring device which comprises a base, a workbench and a mounting frame are arranged at the top of the base, a sleeve mechanism is mounted on the mounting frame, and a transmission mechanism and a stirring mechanism are mounted in the sleeve mechanism. The transmission mechanism comprises a rotating main shaft as well as a first driven shaft, a second driven shaft and a third driven shaft which are arranged around the rotating main shaft; the stirring mechanism comprises a first stirring assembly, a second stirring assembly and a third stirring assembly. The device solves the problems that the viscosity of the conductive slurry is relatively large, bubbles and particle sedimentation are easily generated due to insufficient stirring, and the performance and quality of a finished product are influenced, and achieves the purposes of realizing simultaneous stirring of the conductive slurry by multiple shafts through a planetary transmission mode and realizing bidirectional stirring in the stirring process, thereby improving the stirring full degree and improving the stirring efficiency. And bubbles and sedimentation caused by insufficient stirring of the conductive slurry are avoided.

The invention discloses a forming and coating process method of high, medium and low strength aluminum-clad steel wires for optical cable accessories, and belongs to the technical field of aluminum-clad steel wire strands for optical cable accessories. The preparation method comprises the following steps: placing the modified steel wire in a wire drawing machine for drawing, washing and drying to obtain the drawn modified steel wire; gluing the aluminum wire on the surface of the drawn modified steel wire to form strands to obtain a semi-finished aluminum-clad steel wire; adding composite gel and carbon fiber to ethanol, stirring evenly to obtain a composite filler; dipping the semi-finished aluminum-clad steel wire into the composite filler, taking it out, drying it, placing it in a continuous extrusion coating machine for extrusion, and winding it after cooling and drying to obtain the initial aluminum-clad steel wire. The initial aluminum-clad steel wire is added to the composite material, stirred, taken out, and dried to obtain the finished aluminum-clad steel wire. The carbon fiber and composite gel in the composite filler interact with each other and are filled to the surface of the modified steel wire, thereby increasing the bonding strength between the aluminum wire and the copper wire, and making the coating more uniform.

The present invention provides a method for micro-loss welding of pipeline jumper cables, which relates to the field of cathode anti-corrosion technology. The method comprises the following steps: grinding the conductive sheet; inserting the prefabricated heat insulation board into the pipe gap, spreading the copper core flat, close to the conductive sheet, and fixing it with a fixing clamp; heating the copper welding rod, inserting the heated copper welding rod into the borax bottle, and wrapping a layer of borax on the surface of the copper welding rod; preheating the conductive sheet; dipping the end of the copper welding rod with borax to the place where the copper core of the cable and the conductive sheet are close, heating, and the copper welding rod melts and flows to the contact surface of the copper cable and the conductive sheet, and the cable and the conductive sheet are welded together; after the cable cools down, pull the cable upward to confirm whether the welding head is firmly welded to the pipeline; measure the welding resistance; and repair the welding joint. The damage to the pipeline anti-corrosion and copper core is minimized to the greatest extent, the welding performance is strong, the damaged anti-corrosion area is secondary reinforced and repaired, the external corrosion is isolated, the conductive performance is excellent, and it is suitable for large-diameter PCCP pipeline joint processing operations.

The invention discloses a novel carbonized polybenzoxazine aerogel and a preparation method thereof, the novel carbonized polybenzoxazine aerogel is prepared by carbonizing a novel polybenzoxazine aerogel, and the invention belongs to the technical field of aerogel materials. The preparation method comprises the following steps: preparing a polybenzoxazine solution; putting the polybenzoxazine solution into a mold to form wet gel; aging the wet gel, and drying at normal pressure for 24 hours after aging; the aged wet gel is washed with N, N-dimethylformamide, and wet conductive gel is obtained; and drying the wet gel at normal temperature and normal pressure to obtain the novel polybenzoxazine aerogel. The polybenzoxazine aerogel is subjected to heat preservation for 6 hours at the temperature of 800 DEG C in an argon environment to be carbonized, then furnace cooling is carried out, and the novel carbonized polybenzoxazine aerogel is obtained after the polybenzoxazine aerogel is cooled. The preparation method has the advantages that the bisphenol F type benzoxazine monomer is used as a raw material, and the preparation method is simple through acid catalytic polymerization and normal-pressure drying; compared with other aerogel materials, the aerogel disclosed by the invention has excellent electromagnetic shielding performance and relatively high resistivity.

The invention relates to a photo-hardening conductive composition, which comprises a photo-curing component, a conductive material and a flatting agent. The photocuring component comprises a reactive monomer with an acid ester group, an adhesive and a photoinitiator. And the weight ratio of the adhesive to the reactive monomer with the acid ester group is more than 4. By matching the components of the photo-hardening conductive composition and designing the weight ratio of the adhesive to the reactive monomer with the acid ester group, the conductive hardened material formed by the photo-hardening conductive composition has the advantage of thermal dimensional stability, so that the thermal dimensional stability of the conductive hardened material is improved in the co-sintering process of manufacturing a passive electronic component. The problem of low yield or poor conductivity caused by large size change can be reduced.

The invention discloses a lithium manganese iron phosphate positive electrode material and a preparation method thereof, and belongs to the technical field of lithium batteries, the preparation method of the lithium manganese iron phosphate positive electrode material comprises the following steps: dissolving a soluble iron source, a soluble manganese source and a complexing agent in 100 mL of deionized water, adjusting the pH value of the mixed solution to 2-4, and heating and stirring for 2-6 h to obtain xerogel; calcining the dry gel, taking out, cooling and grinding to obtain powder A; calcining the powder A in a nitrogen atmosphere, and grinding to obtain powder B; uniformly mixing the powder B, a lithium source, a phosphorus source, a carbon source and 70mL of deionized water, sanding, and spray-drying slurry after sanding to obtain powder C; and calcining the powder C in a nitrogen atmosphere, crushing, and sieving to obtain the lithium iron manganese phosphate positive electrode material. The lithium manganese iron phosphate positive electrode material prepared by the method has excellent conductivity and cycle performance.

The invention relates to a battery pack and a vehicle, and belongs to the technical field of batteries. The battery pack and the vehicle comprise a mounting shell as well as a water-cooling substrate, a plurality of electric connecting pieces and a plurality of battery cells which are mounted in the mounting shell, the water-cooling substrate is provided with a water inlet, a water outlet and a flow channel arranged in the water-cooling substrate, and the flow channel is communicated with the water inlet and the water outlet; the electric connecting pieces are attached to the surface of the water-cooling substrate through the first insulating heat-conducting layer, are arranged at intervals and are used for performing electric connection in the battery pack. According to the battery pack and the vehicle disclosed by the invention, sufficient heat dissipation of the electric connecting pieces among the battery cells can be realized.

The invention discloses an explosion-proof human body static discharger, and particularly relates to the field of static dischargers, the explosion-proof human body static discharger comprises a mounting base, a vertical rod is fixedly mounted on the upper end face of the mounting base, a fixing rod is fixedly mounted on the upper end face of the vertical rod, and a touch ball is fixedly mounted on the upper end face of the fixing rod; a transmission device is rotatably mounted on the outer wall of the touch ball, a mounting plate is fixedly mounted at the output end of the transmission device, two mounting holes are symmetrically formed in the two sides of the mounting plate, and a cleaning device is arranged in each mounting hole. When the cleaning device is used, operation is easy, the transmission device rotates to drive the mounting plate and the cleaning device mounted on the mounting plate to rotate on the outer wall of the touch ball, the outer wall of the touch ball can be cleaned through rotation of the cleaning device, oil stains are prevented from being attached to the touch ball, the limiting rod is separated from the fixing hole, and the cleaning device is convenient to operate. And the cleaning device can be conveniently replaced.

The present invention relates to an electrode including an electrode active material layer and a secondary battery including the same, in which the electrode active material layer includes an electrode active material and a conductive agent, and in which the conductive agent includes a first conductive agent and a second conductive agent, wherein the first conductive agent includes secondary particles in a chain form in which a plurality of graphene sheets are arranged in different directions and a portion of one graphene sheet is connected to a portion of another adjacent graphene sheet, and the second conductive agent includes a carbon nanotube structure in which 2 to 5,000 single-walled carbon nanotube units are bonded to each other.

The present application relates to the technical field of new energy vehicles, in particular to a vehicle low-voltage power supply system and an electric vehicle. The present application comprises a storage battery and a DC / DC, one end of the DC / DC is used for connecting a power battery, the other end is connected with the storage battery and a low-voltage load, and is used for charging the storage battery and supplying power to the low-voltage load. The storage battery is connected with emergency loads and 24-hour constant power equipment through a low-voltage power supply circuit. If the power battery and the DC / DC are normal, the DC / DC converts high-voltage direct current of the power battery into low-voltage direct current to supply power to the low-voltage load. If the power battery or the DC / DC fails, the storage battery supplies power to the emergency loads and the 24-hour constant power equipment. The present application not only ensures normal power supply to the emergency loads and the 24-hour constant power equipment of the vehicle, guarantees the stability and reliability of the low-voltage power supply of the vehicle, but also has low system cost and simple structure.

The present invention relates to the technical field of organic silicon coatings, and discloses a method for preparing an insulating heat-conducting organic silicon coating, wherein the present invention uses N-(3-aminopropyl)acetamide, methacrylate-2-(perfluorooctyl)ethyl ester, (3-glycidoxypropyl)methyldiethoxysilane, methyltriethoxysilane, dimethyldiethoxysilane, glacial acetic acid, and modified silicon carbide as raw materials, and uses N-(3-aminopropyl)acetamide and methacrylate-2-(perfluorooctyl)ethyl ester to prepare intermediate 1, and prepares intermediate 2 by hydrolysis reaction, and then prepares intermediate 3 by ring-opening reaction with (3-glycidoxypropyl)methyldiethoxysilane, and finally prepares fluorinated organic silicon by co-hydrolysis-polycondensation method, and then mixes with modified silicon carbide to prepare insulating heat-conducting organic silicon coating. The insulating heat-conducting organic silicon coating prepared by the present invention has good insulation, flexibility, excellent thermal conductivity and corrosion resistance.

The invention discloses a power insulator with a protection structure at the edge, and the power insulator comprises a plurality of groups of ceramic insulators, the outer end of each ceramic insulator is provided with a protection assembly, and the center of each ceramic insulator is provided with a slot. An upper resin rod and a lower resin rod are respectively inserted into the slots at the two ends of the plurality of groups of ceramic insulators, a middle resin rod is inserted into the slot between the upper resin rod and the lower resin rod, fixed seats are fixedly mounted at the separated ends of the upper resin rod and the lower resin rod, and a fastening assembly is arranged on one side of each fixed seat. The flashover phenomenon of discharge breakdown occurs between the adjacent ceramic insulators, the protection assembly can effectively protect the edges of the ceramic insulators, damage caused by overlarge stress at the edges is avoided, the sunken sealing grooves and the umbrella-shaped faces of the ceramic insulators form transitional umbrella skirt-shaped cambered surfaces after being matched with the upper sheath, and therefore the sealing effect of the ceramic insulators is improved. Therefore, water drops cannot gather on the surface and can quickly flow away to reduce the conductivity, and the safety is improved.

The invention discloses a PMMA (polymethyl methacrylate) material atomic vapor pool for low-frequency electric field measurement and a manufacturing method thereof, the atomic vapor pool comprises a pool body made of PMMA material and a convex opening hermetically arranged on the pool body, the convex opening is communicated with an inner cavity of the pool body, and the convex opening is used for vacuumizing the interior of the pool body and filling alkali metal cesium atoms into the pool body. The structure is reliable, the cell body structure is made of a specific PMMA material, the conductivity of the PMMA material is small after cesium atoms are adsorbed, the low-frequency electric field shielding effect caused by adsorption of the cesium atoms is reduced under the condition that the optical property of the material and the influence of the electric field are not changed, the shielding effect is effectively reduced, and measurement of the space low-frequency electric field is achieved.

A combined drive / brake unit (100) integrated into the rim (111) of a wheel (112) includes an axial flux motor (118) and an eddy current brake (120), wherein a common rotor (106) is provided for the axial flux motor (118) and the eddy current brake (120).