Abstract: Disclosed herein is a wide-range temperature electrolyte, a preparation thereof and a lithium ion battery. The wide-range temperature electrolyte includes a glycerin segment, a diisocyanate segment and a segment containing at least two terminal hydroxyl groups and one disulfide bond, and the self-healing electrolyte has a three-dimensional cross-linked network structure. The wide-range temperature electrolyte introduces a large number of repetitive disulfide bond groups and self-complementary hydrogen bond structures into molecules of an electrolyte base material having self-complementary hydrogen bond structures, so as to form the three-dimensional cross-linked network structure. An intermolecular exchange reaction of the disulfide bonds realizes a cross-scale (molecular, micro, and macro-scale) damage sensing response of the electrolyte and a rapid self-healing of the material, and further achieves a multi-level (molecule-component-device-system) self-healing repair function.

Abstract: A method for recycling a lithium iron phosphate positive plate with low energy consumption and low Al content, including: crushing a lithium iron phosphate positive plate to be recycled into a granular material with a particle size of 1-15 mm by using a crusher; heating the granular material obtained in step (1) to 350-500° C. in an atmosphere furnace in an inert atmosphere; and keeping the granular material at 350-500° C. for 0.5-2 h followed by cooling to a preset temperature to obtain a calcined product; grinding the calcined product obtained in step (2) by using a grinder to obtain a ground product with D50 larger than or equal to 50 ?m; and classifying the ground product obtained in step (3) by using an air classifier to remove Al simple substance to obtain a recovered positive material with an Al content below 200 ppm.

Abstract: The disclosure provides an anti-corrosion conductive film and methods of making and using thereof. The anti-corrosion conductive film is formed by sequentially forming an anti-corrosion protective layer, a stress transition layer and a conducting layer on the surface of a substrate by deposition through a high-low pulse bias alternation method. The anti-corrosion conductive film is a nano-multilayer anti-corrosion conductive film exhibiting excellent corrosion resistance and conductivity. The anti-corrosion conductive film has great application prospects in the fields of metal polar plates of fuel cells, ground grid equipment of power transmission lines, and the like.

Abstract: A method for preparing a non-corrosive fire extinguishing agent, including combining a methyl phosphate organosilane material and a perfluorohexanone to prepare the fire extinguishing agent.

Abstract: A method for preparing a non-corrosive fire extinguishing agent, including combining a methyl phosphate organosilane material and a perfluorohexanone to prepare the fire extinguishing agent.

Abstract: The present invention discloses a modular multilevel dynamic switching DC-DC transformer, which consists of N DC-DC sub-modules connected in series. Each of the DC-DC sub-modules is of a symmetrical structure capable of realizing bidirectional power flow, which consists of two half-bridge sub-modules and isolating switches S1, S2 between capacitors C1, C2 of the two half-bridge sub-modules. The capacitors C1, C2 are disposed in parallel between the half-bridge sub-modules and the isolating switches. Assuming that the power flows in the primary side of the DC-DC transformer and flows out from the secondary side; the half-bridge sub-module located on the primary side of the DC-DC transformer is referred to as a primary-side sub-module; and, the half-bridge sub-module located on the secondary side of the DC-DC transformer is referred to as a secondary-side sub-modules.

Abstract: Disclosed herein is a wide-range temperature electrolyte, a preparation thereof and a lithium ion battery. The wide-range temperature electrolyte includes a glycerin segment, a diisocyanate segment and a segment containing at least two terminal hydroxyl groups and one disulfide bond, and the self-healing electrolyte has a three-dimensional cross-linked network structure. The wide-range temperature electrolyte introduces a large number of repetitive disulfide bond groups and self-complementary hydrogen bond structures into molecules of an electrolyte base material having self-complementary hydrogen bond structures, so as to form the three-dimensional cross-linked network structure. An intermolecular exchange reaction of the disulfide bonds realizes a cross-scale (molecular, micro, and macro-scale) damage sensing response of the electrolyte and a rapid self-healing of the material, and further achieves a multi-level (molecule-component-device-system) self-healing repair function.

Abstract: A method for recycling a lithium iron phosphate positive plate with low energy consumption and low Al content, including: crushing a lithium iron phosphate positive plate to be recycled into a granular material with a particle size of 1-15 mm by using a crusher; heating the granular material obtained in step (1) to 350-500° C. in an atmosphere furnace in an inert atmosphere; and keeping the granular material at 350-500° C. for 0.5-2 h followed by cooling to a preset temperature to obtain a calcined product; grinding the calcined product obtained in step (2) by using a grinder to obtain a ground product with D50 larger than or equal to 50 ?m; and classifying the ground product obtained in step (3) by using an air classifier to remove Al simple substance to obtain a recovered positive material with an Al content below 200 ppm.

Abstract: A fire extinguishing system for a lithium battery energy storage unit based on stagewise warning and multiple spraying includes a power management system, a warning control system connected to the power management system and a fire extinguishing device connected to the warning control system. The fire extinguishing device is externally connected to a temperature-sensing fire detection tube, a large-flow release pipeline and a local release pipeline. The warning control system is externally connected to a local data collection module and a lithium battery energy storage pack. The fire extinguishing system of this application is designed to perform cyclical detection according to fire signals, in which a starting signal can be repeatedly sent to achieve multiple starting, so as to suppress a lithium battery fire for a long time and solve the problem of re-ignition.

Abstract: The present invention discloses a modular multilevel dynamic switching DC-DC transformer, which consists of N DC-DC sub-modules connected in series. Each of the DC-DC sub-modules is of a symmetrical structure capable of realizing bidirectional power flow, which consists of two half-bridge sub-modules and isolating switches S1, S2 between capacitors C1, C2 of the two half-bridge sub-modules. The capacitors C1, C2 are disposed in parallel between the half-bridge sub-modules and the isolating switches. Assuming that the power flows in the primary side of the DC-DC transformer and flows out from the secondary side; the half-bridge sub-module located on the primary side of the DC-DC transformer is referred to as a primary-side sub-module; and, the half-bridge sub-module located on the secondary side of the DC-DC transformer is referred to as a secondary-side sub-modules.

Abstract: The present invention discloses a power system reliability assessment method considering optimized scheduling of cascade hydropower stations, by which the reliability of the power system is improved, comprising following steps: establishing power system optimization models; inputting the sequential wind speed, runoff and load data within 24h; in accordance with reliability parameters of units and by the sequential Monte Carlo method, sampling the state durations of three kinds of units and segmenting the state durations on a 24-hour cycle; calculating the sequential output of wind farms within 24h according to wind speed data and the state of wind power units; calculating the hourly loss-of-load, according to the state of wind power units and thermal power units as well as the optimization models; optimizing for 365 days according to the method described in the step 4, and calculating reliability indices; and determining convergence or not, and if not, continuously repeating the steps S3 to S7 until convergen

Abstract: The invention relates to an anti-corrosion conductive film and a pulse bias alternation-based magnetron sputtering deposition method and application thereof. The anti-corrosion conductive film is formed by sequentially forming an anti-corrosion protective layer, a stress transition layer and a conducting layer on the surface of a substrate by deposition through a high-low pulse bias alternation method.

Abstract: A tetradentate chelating monoquinoline derivative with a structure as shown in formula (I) is able to specifically chelate redox active metal ions like copper ions that are dis-regulated in neurodegenerative diseases (Alzheimer's disease, Huntington's disease, Parkinson's disease, and amyotrophic lateral sclerosis), or copper accumulation disease like Wilson's disease. The binding constants of these derivatives for zinc are 6-10 orders of magnitude below that ones for copper, and these derivatives have a good capability of reducing an oxidative stress. The method for preparing the derivative is simple and the derivatives have good application prospects in manufacturing drugs for neurodegenerative diseases and diseases related to disorder of copper metabolism.

Abstract: A tetradentate chelating monoquinoline derivative with a structure as shown in formula (I) is able to specifically chelate redox active metal ions like copper ions that are dis-regulated in neurodegenerative diseases (Alzheimer's disease, Huntington's disease, Parkinson's disease, and amyotrophic lateral sclerosis), or copper accumulation disease like Wilson's disease. The binding constants of these derivatives for zinc are 6-10 orders of magnitude below that ones for copper, and these derivatives have a good capability of reducing an oxidative stress. The method for preparing the derivative is simple and the derivatives have good application prospects in manufacturing drugs for neurodegenerative diseases and diseases related to disorder of copper metabolism.

Abstract: A brush-less DC motor control device includes a position detecting unit that detects the position of a motor rotor and acquires the position signals of the rotor, a reference generating unit that selects a reference time moment according to the rotor's position signal, a current measuring unit that measures the phase current of the motor and acquires the phase current at the reference time moment according to the measured phase current, a calculation unit that calculates the direct axis current of the motor according to the acquired phase current, a phase adjusting unit that adjusts the phase of the drive voltage of a motor coil according to the difference value between the direct axis current of the motor and an expected target current, and a drive unit that outputs drive signals of the motor coil according to the acquired position signal and the phase of the coil's drive voltage.

Abstract: The present invention discloses a position-sensorless control method for a brushless motor, the method including: turning off a first driving voltage of a first phase coil, and within detection time, detecting a back electromotive force of the first phase coil; determining a reference phase and a cycle of a second driving voltage according to the back electromotive force; determining a pulse width modulation signal according to the reference phase and the cycle; and determining to provide the second driving voltage for the brushless motor according to the pulse width modulation signal, the second driving voltage being used to drive the brushless motor. The present invention effectively reduces the cost, decreases implementation difficulty and increases system performance and reliability.

Abstract: The present invention discloses a position-sensorless control method for a brushless motor, the method including: turning off a first driving voltage of a first phase coil, and within detection time, detecting a back electromotive force of the first phase coil; determining a reference phase and a cycle of a second driving voltage according to the back electromotive force; determining a pulse width modulation signal according to the reference phase and the cycle; and determining to provide the second driving voltage for the brushless motor according to the pulse width modulation signal, the second driving voltage being used to drive the brushless motor. The present invention effectively reduces the cost, decreases implementation difficulty and increases system performance and reliability.

Abstract: A method for automatically sending a multimedia file comprises: obtaining a voice feature of each object in a multimedia file (101); matching the obtained voice feature of each object with a voice feature of each contact in a voice parameter database (102); and when matching succeeds, automatically sending the multimedia file to a contact obtained by successful matching (103). Further disclosed are an apparatus for automatically sending a multimedia file, a mobile terminal, and a storage medium.