7results about How to "Reduce flammability" patented technology

This invention discloses an electrolyte and a battery. The electrolyte comprises an electrolyte, a solvent, and a first additive, the first additive having the structural formula (1). The first additive contains silicon-based phosphate groups, which have low oxidation and reduction potentials. It can generate an inorganic interface film rich in P and Si at the positive and negative electrodes. The generated interface helps to reduce the interfacial impedance of the positive and negative electrodes. Cyclic phosphates have good high-voltage stability. The generated phosphate compounds can suppress excessive ion deposition during the high-voltage positive electrode phase transition, providing better protection for the positive and negative electrode interfaces and improving high-voltage cycle performance. The polycyclic phosphate structure can capture hydroxyl radicals and hydrogen radicals generated by the electrolyte at high temperatures, preventing the diffusion reaction of hydrocarbon radicals. At the same time, the silicon-based structure can generate a stable thermally stable film at the positive and negative electrode interfaces. The generated high-thermal-stability inorganic thermal insulation protective layer can reduce the flammability of the electrolyte and significantly improve the safety performance of the battery.

The embodiment of the invention provides a secondary battery and electric equipment, and the secondary battery provided by the embodiment of the invention is characterized in that an electrolyte comprises a fluorine-containing organic solvent, a fluorine-containing lithium salt and a fluorine-containing additive; the fluorine-containing organic solvent comprises a fluorine ether saturated compound and a fluorine cyclic ester compound; the fluorine-containing additive comprises a fluoroether unsaturated compound; according to the electrolyte, the fluoroether saturated compound and the fluorine cyclic ester compound are used as solvents, the fluorine-containing lithium salt is used as an electrolyte, and the fluoroether unsaturated compound is added as an additive, so that the flammability of the electrolyte can be effectively reduced, and the fluoroether saturated compound not only can regulate and control the formation of an interface SEI membrane through molecular polarity, but also can regulate and control the flammability of the electrolyte. And the lithium ion secondary battery can also cooperate with fluorine-containing lithium salt to reduce interface impedance and inhibit generation of lithium fluoride (LiF) by-products, so that the problem of relatively poor cycle performance of the existing secondary battery is improved.

This invention relates to the field of building electromechanical installation technology, and discloses a BIM-based integrated layout and modular prefabrication and installation system for electromechanical pipelines. The system includes multi-disciplinary pipelines and integrated supports installed under the exterior building roof slab. The integrated supports include columns, combined steel beams, and pipe clamps. The pipe clamps are configured as variable-angle pipe clamp assemblies, comprising a variable-angle base connected to the combined steel beam and a clamp movably connected to the variable-angle base. The clamp has an adjustable degree of freedom to rotate relative to the horizontal direction within the vertical longitudinal section, so that the clamping axis of the clamp is aligned with the inclined axis of the inclined ramp section. This invention achieves zero-collision pre-assembly before construction, eliminates potential hazards from on-site demolition and alteration, precisely ensures the physical clearance height between driveways and parking spaces, and the modular prefabricated variable-angle damping pipe clamps passively adapt to and conform to the 45-degree inclined ramp path adjusted by BIM.

The invention discloses a battery combustion suppression device and system, the battery combustion suppression device comprises a shell, a gas channel for flowing of discharged gas is formed in the shell, and the shell is provided with a gas inlet communicated with a discharge port of a battery module or a battery pack and a gas outlet communicated with the outside; wherein at least part of the inner surface of the gas channel is provided with a perfluorohexanone fire extinguishing material, and the perfluorohexanone fire extinguishing material is used for releasing perfluorohexanone fire extinguishing gas and discharging the perfluorohexanone fire extinguishing gas from the gas outlet after the perfluorohexanone fire extinguishing gas is mixed with the discharged gas when the high-temperature and high-pressure discharged gas enters the gas channel through the gas inlet. The fire extinguishing material is introduced into the discharge path, so that the discharged gas is synchronously released and mixed in the flowing process to form low-oxygen and non-combustible mixed gas, eruptive combustion is inhibited before the gas is discharged, the safety of the lithium battery in the early stage of thermal runaway can be improved, the fire risk is reduced, and the service life of the lithium battery is prolonged. The method is suitable for safety protection of the battery module and the battery pack.

The application discloses a preparation method of a complex, and relates to the technical field of boron trifluoride production, and comprises the following steps: S1, vaporizing a ketone intermediate and mixing the ketone intermediate with boron trifluoride gas to perform a complexing reaction, so as to obtain a ketone-boron trifluoride complex; S2, adding diethyl ether drop by drop into the ketone-boron trifluoride complex to perform a coordination reaction, and obtaining a reaction mixture after the reaction is completed; and S3, washing, filtering and evaporating and drying the reaction mixture to obtain a boron trifluoride-diethyl ether complex. According to the preparation method, the intermediate complex is prepared first, and then the boron trifluoride-diethyl ether complex is prepared through a coordination reaction, so that the generation of impurities is reduced, the purity of a product is improved, the operation is safer, the stability of boron trifluoride is protected in the reaction process, and the volatilization and loss of boron trifluoride are reduced.

The application discloses a hydrogen injection strategy optimization method for a dual-fuel X-type rotor engine, obtains geometric parameters of the X-type rotor engine, establishes a CDF fluid simulation model of a dual-fuel X-type rotor engine with gasoline intake port premixing and hydrogen in-cylinder direct injection, determines engine ignition parameters and operating conditions of a single hydrogen injection strategy, and obtains, through simulation calculation, a hydrogen injection time point at which a hydrogen distribution area is maximum and a hydrogen injection time point at which a flame front area is maximum. Under the condition that the hydrogen injection total amount at the two hydrogen injection time points is the same as that of the single hydrogen injection strategy and the hydrogen injection mass fraction at the two hydrogen injection time points is taken as a variable, the hydrogen injection mass fraction corresponding to the hydrogen injection time point at which the hydrogen distribution area is maximum and the hydrogen injection mass fraction corresponding to the hydrogen injection time point at which the flame front area is maximum are obtained through simulation calculation, an optimal two-stage hydrogen direct injection strategy of the dual-fuel X-type rotor engine is obtained, and the thermal efficiency and emission performance of the rotor engine are improved.

The application discloses a heat transfer composition and a preparation method and application thereof. According to the total mass of the composition, the mass proportions of a first component, trans-1,3,3,3-tetrafluoropropene and difluoromethane are x%, y% and z% respectively, the first component is 2,3,3,3-tetrafluoropropene and 1,1-difluoroethane, the proportions (x, y, z) of the three are located in a ternary phase diagram, the x coordinate of point A is 23.6%, the x coordinate of point B is 90.0%, the coordinates of points on the curve segment AB are (x, 70.06-0.6395x-0.001538x 2 , 29.94-0.3605x+0.001538x 2 ), and the coordinates of point C are (77.6, 0, 22.4). The composition has a GWP of not more than 150 and a flammability level of A2L, is a low-global-warming-potential, high-refrigeration / heat-efficiency and low-flammability heat transfer composition for replacing propane, and is suitable for refrigeration / heat application.