266results about How to "Improve high pressure performance" patented technology

The invention belongs to the technical field of lithium ion batteries and particularly relates to a membrane for a lithium ion battery, which is good in safety performance and mechanical performance. The membrane for the lithium ion battery comprises a porous membrane substrate, a ceramic material layer coated on the surface of the porous membrane substrate, and a polymer sticking layer which is coated on the ceramic material layer and is located on the surface layer. Compared with the prior art, the ceramic material layer can form a microcosmic physical separation on the surface of the membrane so as to reduce the piercing effect of a lithium pine-tree crystal on the membrane; the ceramic material layer coated on the porous membrane substrate can improve the heat resistance of the membrane; the polymer sticking layer which is coated on the ceramic material layer and has a sticking effect can be used for preventing an inner short circuit caused by staggering of the membrane and an electrode, so that the safety performance of the battery is enhanced. In addition, the membrane, an anode sheet and a cathode sheet are joined together through the effect of the polymer sticking layer, so that the mechanical performance of the battery can be enhanced. Furthermore, the invention further discloses the lithium ion battery containing the membrane.

A transformer which conducts or responds to a high voltage, high frequency electrosurgical output waveform has a core with a permeability in the range of 500-2000 and a resistivity in the range of 90,000-1,000,000 ohm centimeters and insulation on the secondary high voltage winding of at least 800 VAC per 0.001 inch thickness. The permeability and resistivity of the core enhance energy conversion, reduce parasitic capacitance to enhance the high frequency spectral energy content of the electrosurgical output waveform while simultaneously reducing leakage current, reducing the size of the transformer, enhancing manufacturing reproducibility and enhancing the ability to pass a high voltage safety test.

The invention discloses a low-speed high-pressure vane pump for hydraulic bicycles. The invention comprises an end cover, a principal axis, a framework oil seal, a right casing, a blade, a middle casing, a left casing, a bearing, an O-shaped sealing ring, a bolt, a pressure-limiting spring, a spring seat, a regulating nut, a side end cover, a rotor, a stator, a slide block, a cover plate, a flow adjusting screw, a sealing ring, a lock nut and a needle roller. The invention is characterized in that: a vane groove is arranged in the rotor, a vane spring and a vane bracket are arranged in the vane groove, the vane bracket is positioned by the vane spring, the blade is arranged in the vane groove of the rotor, one end of the blade presses the vane spring, while the other end clings to the inner surface of the stator. The low-speed high-pressure vane pump for the hydraulic bicycles has the advantages of reasonable structure, light self-weight, small bulk, high efficiency, low cost, labor conservation and rapidness, which is adopted to be matched with all wheel diameters of bicycles and has the function of pressure servo variation.

The invention relates to a non-contact mechanical end surface sealing structure, which comprises mechanical sealed movable ring and stable ring. While the end surface of stable or movable ring has micro groove and porous zone that symmetry according to the rotational center. Wherein, said zone is at the ascending part of end surface and the micro groove is at the descending part, which has a circular sealing dam beside it. The invention can be used in variable mediums to increase the ability of solid particle, the static pressure property, fluid dynamic pressure property and the pump adsorption property, to attain better sealing effect, with long service life.

The invention provides a lithium ion battery electrolyte. The lithium ion battery electrolyte is a liquid containing a lithium salt and an organic solvent, the electrolyte also contains a high pressure additive, the high pressure additive comprises a phosphotriester organic matter and/or a phosphite triester organic matter, and the molecular structures of the phosphotriester organic matter and/or the phosphite triester organic matter respectively have at least one cyanophenyl group. The invention also provides a lithium ion battery. The lithium ion battery comprises a shell, a battery cell positioned in the shell, and the lithium ion battery electrolyte. The high pressure resistance of the lithium ion battery is substantially improved.

An ESD self-protection device with an LDMOS-SCR structure and high in holding current and robustness can be used for an on-chip IC high-voltage ESD self-protection circuit. The ESD self-protection device is mainly formed by a P substrate, a P trap, an N trap, a first P+ injection region, a first N+ injection region, a second P+ injection region, a third P+ injection region, a second N+ injection region, a first field oxide isolation region, a thin gate oxide layer, a second field oxide isolation region, a third field oxide isolation region, a fourth field oxide isolation region and a polysilicon gate. According to the ESD self-protection device with the LDMOS-SCR structure, the parasitic LDMOS-SCR structure and an ESD current discharging path with two diodes connected with an LDMOS conducting channel can be formed respectively under the high-voltage ESD pulse effect, an ESD current is discharged rapidly, the holding current and a failure current after device trigger hysteresis are improved, the ESD robustness of the device is enhanced, and the ESD self-protection device is suitable for ESD self-protection of the high-voltage circuit.

The invention relates to a lithium ion battery positive electrode material and a preparation method thereof. According to an embodiment, the lithium ion battery positive electrode can comprise a positive electrode material particle and a solid electrolyte film, wherein the solid electrolyte film is coated on an outer surface of the positive electrode material particle, is a continuous film havingthickness within a range of 1-50 nanometers and comprises an amorphous phase and a crystal phase which coexist, the grain size is within a range of 1-40 nanometers, and no new phase is formed betweenthe solid electrolyte film and the positive electrode particle. By the lithium ion battery positive electrode material, the electrochemical stability can be improved, meanwhile, the problems of volumeexpansion of the positive electrode particle and dissolution-out of transition metal can be prevented, and thus, the lithium ion battery positive electrode material has the advantages of high electrochemical stability, favorable cycle property, high structure stability, good high-voltage performance, high safety and the like.

The invention discloses a lithium-ion battery electrolyte taking LiBF2SO4 as basic lithium salt. The electrolyte comprises the following components: electrolyte lithium salt and an aprotic solvent, wherein the electrolyte lithium salt can be unitary LiBF2SO4 and also can be a mixture of LiBF2SO4 and other common lithium salts; the aprotic solvent is one or a mixture of some of common carbonic ester, sulphite, sulfone compounds and the like. Through the lithium-ion battery electrolyte, disclosed by the invention, the compatibility between the electrolyte and the electrode materials can be improved; meanwhile, the rate performance, the high-temperature performance and the cycle performance of the lithium-ion battery can be effectively improved.

The invention discloses an III-nitride semiconductor avalanche photodetector which comprises a substrate and an epitaxial layer that grows above the substrate. According to a sequence from bottom to top, the epitaxial layer is successively provided with an unintentional adulteration nitride buffer layer, an unintentional adulteration nitride transition layer, a heavy adulteration n-type nitride ohmic electrode contact layer, a heterogeneous light adulteration p-type nitride active layer, a p-type adulteration nitride layer and a heavy adulteration p-type nitride ohmic electrode contact layer. Simultaneously, the invention discloses a device manufacturing method, the method comprises the steps of taking advantage of multiple times of photoetching and dry etching to make steps on the periphery of a device, respectively carrying out vapor deposition of p-type and n-type metal electrodes on the p-type ohmic contact layer and the n-type ohmic contact layer, and forming ohmic contact with a semiconductor through an alloy. According to the device structure, the electric field intensity of an avalanche photodiode active area can be enhanced, and the properties of low dark current, high gain and high detection responsivity of the nitride avalanche photodetector can be realized by effectively increasing the field intensity of the active area and reducing the marginal leakage current of the device.

A lubrication apparatus of a high pressure pump for a common rail system can improve lubrication performance for a friction portion M1 between a roller 12 and a shoe by supplying a large amount of lubricating fuel, which is supplied from a low pressure pump 24, to the friction portion M1 for a short time.

The invention discloses an assembled half-exposed framework high-pressure seal ring, which not only can seal in a rotating way, but also can seal in a reciprocating way. The seal ring includes a rubber body with a sealing lip, a metal framework vulcanized in the rubber, and a half-exposed framework, a pressure bearing ring taking a metal or non-metal composite material and a spring that are assembled on the rubber body. The half-exposed framework, the composite material pressure bearing ring and the rubber body of the seal ring are designed in an assembling way; and the composite material pressure bearing ring is arranged between the half-exposed framework and the sealing lip, and the pressure bearing ring bears a large amount of working pressure. The assembled half-exposed framework high-pressure seal ring has extremely high high-pressure resistance, outstanding and stable extrusion resistance, excellent heat dissipation and friction lubricating property, good eccentricity adaptability, extremely long service life, simple process, and efficient and stable machining.

The invention relates to a high-voltage polymer electrolyte and a preparation method of a solid-state battery thereof, and the preparation method of the high-voltage polymer electrolyte comprises thefollowing steps: (1) dissolving a polymer in a solvent at normal temperature or by heating at the temperature of 25-120 DEG C; (2) dissolving a certain proportion of lithium salt into the mixture, wherein the mass of the lithium salt accounts for 100%-200% of the mass of the polymer; (3) adding a high-voltage additive into the mixture, uniformly stirring, then pouring the mixture into a membrane or coating the membrane with the mixture, and carrying out blast heating and drying to obtain a high-voltage-resistant composite high-voltage polymer electrolyte membrane, wherein the mass of the high-voltage additive accounts for 1%-10% of the mass of the polymer. The high-voltage polymer electrolyte is prepared by adding the high-voltage-resistant additive, has relatively low interface impedanceand relatively high ionic conductivity, and is beneficial to improving the energy density, the power density and the safety of the solid-state battery.

The invention relates to a lithium ion battery cathode material and a preparation method thereof and a lithium battery. The lithium ion battery cathode material comprises cathode material particles and an inorganic solid electrolyte membrane covering the outer surface of the cathode material particles; doping elements are distributed on the surface of the cathode material particles from outside toinside to form a gradient solid solution layer, and the concentration of the doping elements in the gradient solid solution layer gradually decreases from the surface to the inside; the doping elements are 4d and 5d metals; the outer surface of the cathode material particles is covered with the inorganic solid electrolyte membrane, the inorganic solid electrolyte membrane is a continuous membranehaving a thickness of 1 to 200 nm, the inorganic solid electrolyte membrane comprises an amorphous phase and a crystalline phase that coexist, and the crystalline grain size is in a range of 1 to 40nm. The lithium ion battery cathode material has the advantages of high electrochemical stability, high voltage resistance, good cycle performance, strong structural stability, high safety, and the like.

The invention discloses a longitudinal NPN triggered high-voltage ESD (Electronic Static Discharge) protective device with high maintaining voltage. The protective device can be used for an on-chip IC (Integrated Circuit) high-voltage ESD protective circuit and mainly comprises a substrate Psub, an N buried layer, P epitaxy, an N sink, a high-voltage deep N well, a first N+ injection region, a first P+ injection region, a second N+ injection region, a third N+ injection region, a polysilicon gate, thin gate oxide and a plurality of field oxide isolation regions. A reverse PN junction of an internal longitudinal NPN structure of the protective device is triggered and switched on under a high-voltage ESD pulse action to form a plurality of ESD current discharge paths connected in parallel, so that secondary breakdown current of the device can be raised, the switch-on resistance can be reduced, and the robustness of the device can be improved. The current path of the device after triggering and switch-on is extended by extending the length of the polysilicon gate of an LDMOS (laterally diffused metal oxide semiconductor) device, increasing the base width of the NPN structure, and employing the N buried layer and the N sink, the electric field distribution in the device is changed, and the voltage endurance capability and maintaining voltage of the device are improved and increased.

A preparation method of a high-voltage-resistant solid polymer electrolyte includes the steps of: 1) according to certain ratio, dissolving a polymer substrate, lithium salt, and an inorganic additivein anhydrous acetonitrile and stirring the mixture at room temperature to obtain a uniform solution, wherein the polymer substrate is polyoxyethylene, the lithium salt is lithium bistrifluoromethylsulfonimide or lithium perchlorate; the inorganic additive is nano-wires or nano-particles of zinc borate, aluminum borate, sodium tetraborate, barium metaborate or calcium borate, the mass ratio of thepolyoxyethylene to the lithium salt EO : Li<+> is 10-20:1, and the mass of the inorganic additive is not more than 20% of the total mass of the polymer substrate and lithium salt; 2) pouring the solution into a polytetrafluoroethylene mold to volatilize the solution until completely dried, thus preparing the solid polymer electrolyte. The method improves the high-voltage resistance of the solid polymer electrolyte, so that the product fits a high-voltage ternary cathode material and energy density and safety of an all-solid-state battery are improved.

The invention relates to a production process for an electric and light source integrated light emitting diode (LED) aluminum-based circuit board. A finished product is obtained according to the following steps of surface processing on an aluminum plate, head conduction adhesive fabrication, coating, composite copper foil lamination, cutting, positioning hole drilling, pre-processing, circuit pattern forming, etching and film removal, positioning hole by a target process, circuit on/off test, solder resistant white oil coating, exposure, development, character printing and curing, punching, v-shaped cutting and anti-oxidation process, wherein in the step of coating, the heat conduction adhesive is sprayed by a curtain formed by a spraying cutter. By the process, an aluminum-based circuit integrated with a light source and an electric source can be produced at a large scale, and the fabricated LED and the electric source both have favorable heat dissipation performance.

The invention relates to a vacuum switch tube, comprising a first electric conduction pole and a second electric conduction pole. A contact is arranged at one end of the first electric conduction pole and a second contact is arranged at one end of the second electric conduction pole. Each of the first contact and the second contact comprises an electric conduction assembly and a magnetic conduction assembly which are sealed inside a vacuum tube face to face with each other; wherein the front end of the first contact is provided with a convex hemispheroid and the front end of the second contact is provided with a concave hemispheroid which matches with the convex hemispheroid at the front end of the first contact. The electric conduction assembly and the magnetic conduction assembly are matched like Yin-Yang fish in shape. The magnetic conduction assembly of the first contact is arranged face to face with the electric conduction assembly of the second contact, and the electric conduction assembly of the first contact is arranged face to face with the magnetic conduction assembly of the second contact. The surface areas of the contacts of the vacuum switch tube are increased, thus reducing the increase of the resistance caused by poor contact. Meanwhile, a revolving magnetic field is formed between contacts of the convex hemispheroid and the concave hemispheroid, which is good for arc extinguishing, thus improving breaking capacity.

The invention relates to a polypropylene (PP) composite material and a preparation method thereof. The polypropylene composite material comprises the components in parts by weight as follows: 50-80 parts of polypropylene, 5-20 parts of graphite powder, 8-20 parts of glass fiber, 1-3.6 parts of surface treating agent, 0.4-7.4 parts of unsaturated carboxylic acid and polypropylene graft phase solvent, 0.6-1.6 parts of maleic anhydride phase solvent, 0.4-3 parts of coupler and 1-4 parts of antioxidant. The preparation method comprises the following steps of: firstly, carrying out surface treatment on graphite powder and glass fiber; then, mixing polypropylene, unsaturated carboxylic acid, polypropylene graft phase solvent, antioxidant and graphite powder after surface treatment at high speed to obtain a graphite/PP mixture; and then, melting, cutting, mixing, homogenizing, extruding, cooling and prilling the graphite/PP mixture and dried glass fiber by a double-screw extruder to obtain graphite modified and reinforced PP composite material. The PP composite material provided by the invention is better in heat resistance and chemical corrosion resistance, and meanwhile, the tensile strength and impact strength are further remarkably improved.

The invention relates to a condenser and a heat radiation net for integrally formed fined aluminum alloy composite material seamless micropore fin. An air inlet nozzle, an air outlet nozzle, an air inlet, an air outlet, the channels of an upper cover plate and a lower cover plate and the seamless microspores of a heat radiation part are connected to a communicated microporous path; the heat radiation part is an integrally formed aluminum composite material flat tube aluminum profile part which is symmetrically at two sides and a plurality of radiating fins are uniformly distributed on the aluminum profile part; at least two communicated seamless microspores which are uniformly distributed are arranged at the upper and lower ends of the heat radiation part and are connected with the upper and lower cover plates using screws after being arranged side by side in the weldless mode; the gasket devices are adopted at the positions that various fittings are connected with each other and various fittings are connected by adopting the screws; the device is practically used in the air conditioning system which the carbon dioxide is used as the refrigerants for, thus effectively solving the problem that the condenser and the heat radiation net bearing the high-pressure microspores are hard to be produced; in addition, the invention has high sealing performance and strong compression resistance, thus providing an energy-saving and environment-friendly optimal design for the condenser and the heat radiation net for the future automobiles and commercial civil air conditioning system.

The invention provides an electric heater, a defroster, an air-conditioning heating system and an automobile. The electric heater comprises a frame and a heater body component in the frame, wherein the heater body component comprises a plurality of heat dissipation bars and a plurality of heating elements, and the heat dissipation bars and the heating elements are arranged side by side at intervals. Each heating element comprises a core tube and a PTC thermistor installed in the core tube, heat conducting silica gel is arranged between each core tube and the adjacent heat dissipation bars, and the core tube and the adjacent heat dissipation bars are bonded through the heat conducting silica gel. The end, used for being connected with a current, of the heater body component is wrapped by a sealing waterproof rubber frame, and the sealing waterproof rubber frame is located in the frame. The waterproof performance can reach the IPX 7 level, and the comprehensive performance such as high voltage resistance and vibration performance is still high.