73results about How to "Reduce the risk of spontaneous combustion" patented technology

The invention discloses a spontaneous combustion early warning system for monitoring an electric vehicle in charging by a charging pile, and relates to the technical field of batteries. The system includes a processor, the processor communicates with a BMS system of the electric vehicle through a CAN bus, and is also connected with a data analysis module, an active protection module and a spontaneous combustion early warning report generation module. A spontaneous combustion analysis module is used for comprehensively judging the temperature and the internal resistance state of a battery packaccording to detection data of the charging pile and the BMS system, so that stepped early warning against the spontaneous combustion state is realized; the spontaneous combustion analysis module comprises a temperature module and an internal resistance module; the active protection module is used for carrying out charging interruption operation according to the judgment result of the spontaneouscombustion analysis module; and the spontaneous combustion early warning report generation module is used for generating a spontaneous combustion early warning condition report of the battery pack according to the judgment result of the spontaneous combustion analysis module. The whole system is simple in structure, convenient to operate, low in cost and convenient to apply and popularize.

The invention discloses a boundary coal shortwall continuously-mining tunnel arrangement and coal pillar preserving methods, according to three typical overlying rock structures, three coal pillar arrangement methods are proposed, and the three coal pillar arrangement methods are respectively a block section wide coal pillar arrangement method, a block section narrow coal pillar arrangement method and a block section non coal pillar arrangement method. Compared with the traditional shortwall continuously-mining tunnel technique tunnel arrangement and coal pillar preserving methods, by the boundary coal shortwall continuously-mining tunnel arrangement and coal pillar preserving methods, the coal pillar size is reduced, the recovery rate of resources can be improved, the roof essential security can be realized, roof safety can be effectively controlled, tunnel excavation and maintenance amount can be reduced, and the risk of coal spontaneous combustion can be reduced.

The application discloses a method and system for improving the quality of low-rank coal. The method comprises the following steps: drying to remove water in lignite which is crushed into a preset degree; sorting the dried lignite to remove pulverized coal; conducting destructive distillation on the sorted lignite at a low temperature. According to the application, the adjustability of the whole process is enhanced, and the energy distribution of the system is optimized, so that the adverse impact of pulverized lignite on low-temperature destructive distillation is reduced to the maximum extent, the quality of tar is improved, and the granularity range of quality-improving feed coal is broadened; as severe screening of the feed coal is not required, equipment investment is reduced, and potential accidents of dust pollution and spontaneous combustion are reduced.

The invention discloses an unconventional natural gas well horizontal staged methane multi-stage pulse blasting fracturing enhanced extraction method. The method is suitable for efficient extraction of shale gas, coal bed gas and gas of a tight gas well. Firstly, the whole section of a horizontal well is perforated to form a guide slot; then oxygen is injected into the sealed section and premixed with methane to form mixed gas with a certain concentration; methane is detonated, first-stage pulse blasting fracturing is conducted, and a reservoir around the slot is fractured; meanwhile, methane desorption of the reservoir is promoted by high temperature; when it is monitored that the temperature and the carbon monoxide concentration exceed alarm threshold values, nitrogen is injected into the section, and the spontaneous combustion risk of the reservoir is eliminated; after methane is fully desorbed, secondary and other multi-stage pulse blasting fracturing is repeatedly conducted, and a three-dimensional fracture network is formed; after fracturing of the section is completed, the next section continues to be subjected to blasting fracturing until fracturing of all sections of the horizontal well is completed; and finally, methane extraction is conducted. According to the method, in-situ desorption of methane in the horizontal well is used for inducing blasting, the three-dimensional fracture network is constructed, and the extraction efficiency of the unconventional natural gas well is improved.

The invention relates to a system and process for coal seam permeability improvement by inducing hole drilling extraction later-period gas burning explosion. The left end of a connecting pipe (2) is connected with a first gas extraction pipe (1); the right end of the connecting pipe is connected with a sealed gas extraction drilling hole (17); a third electromagnetic valve (8) is arranged on a water conveying pipe (10); a water discharging pipe (13) is arranged on a pipeline for connecting the third electromagnetic valve and the connecting pipe; a fourth electromagnetic valve (9) is arranged on the water discharging pipe; a first electromagnetic valve, a second electromagnetic valve, the third electromagnetic valve, the fourth electromagnetic valve, a temperature sensor, a methane sensor and a carbon monoxide sensor are connected with an intelligent controller (12) through connecting wires (11); and an electric spark igniter (14) is connected with an external power supply switch through a conducting wire. The system has the advantages that the operation is simple; the real-time monitoring can be realized; the manual coal seam burning explosion permeability improvement induction is realized; the gas permeability of a coal seam can be improved in a short time; and the problems of high-gas low-permeability coal seam gas extraction difficulty and fast extraction concentration reduction are solved.

The invention relates to an upgraded coal cooling and humidifying device which comprises a rotary cooler, a humidifier and a scrubbing tower, wherein an upgraded coal discharging hole of the rotary cooler is connected with an upgraded coal inlet in one side on the top of the humidifier; an upgraded coal outlet is formed in the other side at the bottom of the humidifier; a water spraying device isarranged on the top of the humidifier; an air inlet is formed in one end of the humidifier close to one side of the upgraded coal inlet; a tail gas outlet is formed in the top of the humidifier closeto the upgraded coal outlet; the tail gas outlet is connected with the tower column on the lower part of the scrubbing tower by virtue of a pipeline; at least two stages of spraying devices are arranged on the upper part of the scrubbing tower; a net gas outlet is formed in the top of the scrubbing tower; a washing water outlet is formed in the bottom of the scrubbing tower and connected with thespraying device by virtue of a washing water circulating pipeline; and a circulating pump and a washing water supply inlet are arranged on the washing water circulating pipeline. By virtue of a methodfor combining indirect cooling and humidification cooling, the temperature and moisture of the upgraded coal meet the requirements. Meanwhile, dust-containing steam produced in the humidification cooling process is effectively treated, and up-to-standard discharge is achieved.

The invention relates to a goaf air leakage prevention method for a thin coal seam N00 mining method. An air inlet roadway and an air return roadway are formed on the two sides of a goaf. The goaf airleakage prevention method comprises the steps that a movable telescopic air barrier is arranged on one side, positioned at a working surface, of the goaf, wherein the movable telescopic air barrier is used for preventing airflow of a coal mining roadway from entering the goaf; and spraying layers are formed on the goaf on the sides of retaining roadways of the air inlet roadway and the air returnroadway, wherein the spraying layers are used for preventing the airflow of the roadways from entering the goaf. According to the goaf air leakage prevention method for the thin coal seam N00 miningmethod, the movable telescopic air barrier capable of preventing the air leakage of the working surface is arranged between the goaf and the working surface, so that the airflow of the working surfaceis prevented from entering the goaf; and spraying materials are uniformly sprayed to form the spraying layers on the sides of the retaining roadways formed by continuously formed gangue filling supports, so that the airflow of the roadways is prevented from entering the goaf, and the tightness of goaf at the roadway sides is guaranteed.

The invention belongs to the technical field of new energy vehicles, and particularly relates to a vehicle safety monitoring method, a monitoring device and a monitoring system. The vehicle safety monitoring method comprises the following steps of: acquiring a current temperature value of a battery, and controlling athe cooling system to start running and controlling an alarm to give an alarm according to the condition that the current temperature value of the battery exceeds the set temperature value. According to the vehicle safety monitoring method, the cooling system is controlled to be started to operate according to the fact that the current temperature value of the battery exceeds the set temperature value, the alarm is controlled to give an alarm to other platforms, the spontaneouscombustion risk is reduced, meanwhile, the alarm information is sent out in time, larger losses can be avoided, the cost can be saved, and the safety can be improved.

The invention provides a brown coal drying device. The brown coal drying device comprises an air inlet, an air heater, an air blower, a discharging port, a conveying belt, an air outlet, a cyclone dust collector, a feeding port and a drying oven, wherein the drying oven is in a cylinder shape and is placed vertically, the feeding port is formed in the center of the top of the drying oven, and connecting pipelines on the two sides of the feeding port are connected with the air outlet and used for exhausting drying tail gas; the discharging port is formed in the center of the bottom of the drying oven, and connecting pipelines on the two sides of the discharging port are connected with the air inlet and used for delivering drying air; the conveying belt is spiral, and the included angle between the conveying belt and the horizontal plane is 12 degrees; the air heater and the air blower are sequentially connected to an air inlet pipeline; and the cyclone dust collector is connected to an air outlet pipeline. The invention further discloses a brown coal drying method adopting the drying device. The brown coal drying device and method have the remarkable advantages that the structure is simple, the drying efficiency is high, and the effect is remarkable.

The invention relates to an animal carbonizing treatment method and device, in particular to an emergent temperature control method and device in an animal pyrolysis carbonization process. In the pyrolysis carbonization process, when the temperature in a combustion chamber exceeds 1000 DEG C, nonflammable inert gas is introduced into a carbonizing tank, and thus the concentration of pyrolysis gas in the carbonizing tank is reduced. The emergent temperature control device comprises a carbonizing chamber, the combustion chamber and a gas passage. The carbonizing tank is arranged in the carbonizing chamber. The space between the outer wall of the carbonizing chamber and the outer side of the carbonizing tank serves as a heat exchange area for heating or cooling the carbonizing tank. The gas passage comprises an inert gas guide pipe used for introducing the nonflammable inert gas into the nonflammable inert gas. One end of the inert gas guide pipe is connected to the interior of the carbonizing tank, and the other end of the inert gas guide pipe is connected with an inert gas tank. By the adoption of the emergent temperature control method, when heat of the pyrolysis gas is too much and accordingly the temperature of the combustion chamber is too high, the concentration of flammable gas in the pyrolysis gas in the carbonizing tank can be reduced during a short period of time, the situation that ultrahigh temperature is generated by the pyrolysis gas in the combustion chamber is avoided, and accordingly the heat of the pyrolysis gas is reduced.

The invention discloses a pneumatic disc type brake capable of bidirectionally adjusting a brake clearance. The pneumatic disc type brake capable of bidirectionally adjusting the brake clearance comprises an air chamber, a brake disc, a brake part for an inner friction disc and an outer friction disc arranged on two sides of the brake disc, a clamp body matched with the outer friction disc, an external programmable logic controller (PLC), a clearance adjustment piece matched with the air chamber, a temperature sensor arranged above the brake part, and a power part matched with the clearance adjustment piece. The clearance adjustment piece comprises a drive rod in running fit with the clearance adjustment piece and matched with the inner friction disc; a holder fixedly connected onto the clamp body is arranged on the outer side of the brake part; the temperature sensor is fixedly connected to the side surface, close to the brake part direction, of the holder; and the external PLC is electrically connected with the temperature sensor and the power part through a wire harness. According to the pneumatic disc type brake capable of bidirectionally adjusting the brake clearance providedby the invention, the dragging abrasion and the abnormal heating of the brake and even the occurrence of the dangerous situation of spontaneous combustion caused by an undersize clearance can be effectively reduced, and the economic loss is reduced; and the brake clearance can be bidirectionally adjusted, and meanwhile, the pneumatic disc type brake capable of bidirectionally adjusting the brake clearance is stable in performance and reliable to adjust.

The invention discloses a method for preventing residual coal during top coal caving on a fully mechanized caving face. The method comprises the following steps: after caving top coal in previous circulation and drawing a rear conveyor, and further entering into top coal caving in next circulation, firstly, operating a tail beam spile of a fully mechanized caving bracket for inbreak of broken waste rocks in a worked out section from a tail beam, wherein the broken waste rocks are filled in space formed by the rear conveyer moving forward; naturally forming a slope after the space is filled by the waste rocks; then, operating a tail beam jack of the fully mechanized caving bracket to swing the tail beam up and down, wherein at the moment, top coal directly flows into the rear conveyer along the slope of the tail beam and the broken waste rock slope. As the space formed by the rear conveyer which moves forward and the worked out section is filled by broken waste rocks, the top coal recovery rate is improved. The danger of coal spontaneous combustion to generate fire in the worked out section on a working face is further reduced, thereby guaranteeing safe mining of the working face.

The invention provides a regeneration method and device of a particle catcher and belongs to the technical field of automobile tail gas treatment. The method comprises the steps that an environment temperature is obtained; a target rotating speed is determined according to the environment temperature, wherein the target rotating speed is the rotating speed of an engine during regeneration of the particle catcher; and a vehicle is controlled to conduct particle catcher regeneration at the target rotating speed in an idling state. The target rotating speed is determined according to the environment temperature, so that the engine can operate at a rotating speed relatively suitable for the current environment temperature, for example, when the environment temperature is low, the engine operates at a high rotating speed, the regeneration efficiency of the particle catcher is improved; and when the environment temperature is high, the engine operates at a low rotating speed, the temperatureof a front cabin of the vehicle is prevented from being too high, and therefore the risk of spontaneous combustion of the vehicle in the regeneration process of the particle catcher is reduced.

The invention relates to a flame-retardant lithium battery electrolyte. The flame-retardant lithium battery electrolyte comprises the following components in parts by weight: 21-25 parts of dimethyl sulfoxide, 1-5 parts of tribromoethane, 25-31 parts of dibromomethylfuran, 5-11 parts of pyrrolidone, 15-21 parts of potassium methylsulfonylimine, 1-5 parts of lithium phosphate, 1-5 parts of sodium carboxymethylcellulose, 1-5 parts of sodium polyaspartate and 1-5 parts of p-phenylenediamine oxalate. The invention provides the flame-retardant lithium battery electrolyte, so that the using capacityof a lithium battery can be higher than 80% of the theoretical capacity thereof.

The invention discloses a discharged material cooling heat recovery sludge low-temperature drying device. The device comprises a drying box body, a sludge inlet formed in the top of one end of the drying box body and a sludge outlet formed in the bottom of the other end of the drying box body; a mesh belt group is arranged in the drying box body from the sludge inlet to the sludge outlet. The device is characterized in that: at least a plurality of dehumidification modules are arranged around the mesh belt group in the conveying direction of the mesh belt group; and a cooling heat recovery module for reducing the temperature of discharged sludge and recovering heat of the discharged sludge is arranged around the mesh belt group at the position close to the sludge outlet. Sludge at a lower-layer discharging end is cooled to the normal temperature or below through the cooling heat recovery module, so that sludge fermentation and odor emission are reduced; meanwhile, heat of lower-layer discharged sludge is recovered into upper-layer fed sludge, so that the risk of spontaneous combustion caused by heat accumulation in organic drying sludge is completely eradicated, and meanwhile the running efficiency of a system is improved.

The invention discloses a fully mechanized caving mining method for an extra-thick hard coal lower layer. The method includes the steps that an extra-thick hard coal layer is divided into an upper layer and the lower layer; the lower layer is tunneled after the fully mechanized mining of the upper layer is finished; top coal on the roadway of the lower layer is reserved and the top coal is taken as a fully mechanized mining roof which does not need to be paved with a net; coal is recycled as caving coal after the coal arrives at the back of a frame; fully mechanized caving equipment is mountedin the roadway of the lower layer; a coal mining machine is adopted to cut the coal at the lower part of the lower layer; and the top coal is recycled at the upper part of the lower layer by top coalcaving. According to the fully mechanized caving mining method for the extra-thick hard coal lower layer, the top coal is used as the fully mechanized mining roof, lapping is not needed, and the topcoal is recycled the as caving top coal after arriving at the back of the frame, so that the safety of the roof is ensured, and coal resources are recycled. The method improves the recovery rate of the coal resources, reduces the hidden danger of the spontaneous combustion of goaf, which is better in safety, is high in efficiency, is good in benefit, and provides a new technology, a new method andnew experience for the safe and efficient recovery of the lower layer after the upper layer fully mechanized mining of the extra-thick hard coal.

The invention discloses a parking charging parking space with a sunshade. The parking space comprises two lifting grooves with rightward upper openings on the ground. A pressing plate is arranged in each lifting groove in a left-right sliding manner; a movable rod is fixedly connected to the left middle end of the pressing plate on the rear side; and a rear reset spring is fixedly connected between the pressing plate and the inner wall of the left side of the lifting groove, a transmission cavity is formed in the middle of the ground, and the left end of the movable rod is located in the transmission cavity and rotatably connected with a right bevel gear. When a vehicle is parked, a sunshade is provided for the vehicle to wrap the whole vehicle, and a risk of spontaneous combustion causedby heating of the vehicle in summer is prevented. After the vehicle is driven into the parking space, a sealing plate is opened, and a sunshade folding awning can be unfolded forwards from the rear side to wrap the vehicle; after payment, the sunshade folding awning can be folded to provide a place for next parking; and when the sunshade folding awning is not used, an extra space is not occupied,the parking space is more suitable for being used in hot days by modern electric vehicles compared with common parking spaces, and the spontaneous combustion risk that the vehicles are exposed to thesun when parked outdoors can be reduced.

The invention relates to a system and method for producing rubber powder at normal temperature through waste tires. The system comprises a ring cutting machine, a shredder, a butterfly separator, a plurality of rubber crushers and auxiliary machines thereof, a magnetic separator, a fiber separator, a rubber powder bin and a rubber powder grading device. Through the system and method for producingthe rubber powder at the normal temperature through the waste tires, the problems that in the process for producing rubber powder through waste tires, energy consumption is high, dust pollution is serious, and many accidents occur are solved completely, automatic operation of whole crushing, intermediate crushing of crushed rubber and fine powder grinding is achieved, energy conservation and environment protection are achieved, manpower quantity and labor intensity are lowered substantially, and quality of the obtained rubber powder is good.

The invention discloses a carbon-containing fly ash high-temperature melting treatment system. The carbon-containing fly ash high-temperature melting treatment system comprises a fly ash conveying assembly, a cyclone cylinder and a settling chamber, the fly ash conveying assembly is used for storing and conveying carbon-containing fly ash, mixing the fly ash with air and conveying the fly ash and the air into the cyclone cylinder together; the cyclone cylinder is used for carrying out combustion treatment on the fly ash input by the fly ash conveying assembly, so that the fly ash is melted when the temperature reaches above an ash melting point, slag and high-temperature flue gas are generated, and meanwhile, heat released by combustion of the fly ash is absorbed to generate steam for use; and the settling chamber is connected with the cyclone cylinder through a high-temperature flue gas flowing opening and is used for separating a small amount of fly ash carried in the high-temperature flue gas. According to the carbon-containing fly ash high-temperature melting treatment system, the fly ash is combusted, the fly ash is melted to form the slag when the temperature reaches the ash melting point or above, the carbon content of the slag is almost zero, the problem that the treatment difficulty of the carbon-containing fly ash is large is solved, recycling of combustion heat is achieved, and the efficiency and the heat efficiency of carbon-containing raw material combustion equipment are improved.

The invention discloses a spontaneous combustion preventing composition, use of the composition, a preparation method for the composition and a method for inhibiting coal and coal gangue from spontaneous combustion. The spontaneous combustion preventing composition disclosed by the invention contains the ingredients in parts by weight: 100 parts of polyvinyl acetate, 0.1-3 parts of bisphenol A, 1.5-30 parts of emulsifier, 0.3-2 parts of organosilicon defoamer and 50-200 parts of water. The spontaneous combustion preventing composition disclosed by the invention can be used for forming a layer of protective film on the surface of each coal and coal gangue granule, so that rainwater erosion is prevented, the process that water is evaporated from the coal and the coal gangue and surface ash content is increased is retarded, the circulation of air inside deposits is blocked, and the risk of spontaneous combustion of the coal or coal gangue is reduced.

The invention relates to a system of measuring coal leakage rate of gangue recovery based on an X-ray method and alarming. A device is mounted on a gangue conveying belt and is composed of X-ray detection equipment and a counter. The X-ray detection equipment comprises an X-ray detection probe, a photodiode and a data acquisition card. The X-ray probe is connected to the photodiode, the photodiode is connected to the data acquisition card, and the data acquisition card communicates with the external counter. Different attenuation intensities of rays after gangue is detected by the X-ray probe are used to identify gangue; signals are converted and acquired through the photodiode and the data acquisition card, the gangue amount and the coal leakage are recorded in real time, and the coal leakage rate is obtained by means of additive operation and division operation of the counter; the coal leakage rate is compared with a set coal leakage rate threshold value; when the measured coal leakage rate reaches or exceeds the set coal leakage rate threshold value, an alarm indicating lamp on the counter will be turned on. The coal mixing rate in gangue during gangue recovery can be indirectly calculated by means of the device, and a function of alarming is achieved if the coal leakage rate exceeds the threshold value.

The invention discloses a sealing material for coverage treatment of coal gangue mountains and a construction method. The sealing material is prepared from solid wastes, an additive and water, whereinthe additive is prepared from an ion curing agent and an exciting agent; the ion curing agent accounts for 0.25 percent to 0.5 percent of the mass of solid wastes, the exciting agent accounts for 0.5percent to 0.75 percent of the mass of the solid wastes and the water accounts for 27.5 percent to 29.3 percent of the mass of the solid wastes; the solid wastes are prepared from the following components in percentage by mass: 50 percent to 60 percent of red mud, 22.5 percent to 35 percent of fly ash, 2.5 to 7.5 percent of desulfurized gypsum and 5 percent to 10 percent of lime; the exciting agent is prepared from 30 percent to 35 percent of polymerized active aluminum, 10 percent to 20 percent of sodium hydroxide, 10 percent to 20 percent of sodium silicate and 35 percent to 40 percent of cement; the ion curing agent is prepared from the following components in percentage by mass: 50 percent to 60 percent of laminar double metal hydroxide and 40 percent to 50 percent of ammonium chloride. According to the sealing material disclosed by the invention, mechanical performance, sealing performance and environment-friendly performance indexes needed by coal gangue mountain treatment are met, and a lot of solid wastes including the red mud, the fly ash and the desulfurized gypsum are consumed; meanwhile, self-ignition risks of the coal gangue mountains are reduced.

The invention relates to the technical field of fire-fighting monitoring, in particular to a shop-type fire-fighting safety monitoring method based on 5G communication, and the method comprises the steps: obtaining the information of each to-be-monitored shop, wherein the information of each to-be-monitored shop comprises shop position information and goods type information; obtaining shop storageinformation of each piece of to-be-monitored shop information according to the shop position information, and setting a corresponding storage monitoring level for each piece of shop storage information according to the cargo type information; when shop purchase information is obtained, comparing the shop purchase information with the corresponding goods type information to obtain a storage purchase type; and calculating shop inventory information according to the shop storage information and the storage purchase type, and generating a fire control message according to the shop inventory information and the storage monitoring level. The invention has the effect of effectively monitoring fire-fighting conditions of shops.

The invention discloses a lightweight flame-retardant sponge and a preparation method and application thereof. The lightweight flame-retardant sponge is formed by foaming, molding and curing the following components in parts by mass: 100 parts of polyether polyol PPG; 110 to 120 parts of toluene diisocyanate TDI; 0.4 to 0.8 part of a halogen-free reactive flame retardant, 0.6 to 1 part of a catalyst; 6-8 parts of silicone oil; 90-110 parts of methylene chloride; 12-15 parts of water; 0.4 to 0.8 part of an antioxidant; 1-1.5 parts of a plasticizer; 0.4 to 0.8 part of a heat stabilizer and 1-1.5parts of glycerol. The density of the lightweight flame-retardant sponge can be reduced, the quality of materials with the same volume can be reduced, the toughness is improved, and the manufacturingcost is reduced.

The invention relates to the technical field of oil gas purification equipment, specifically to an efficient oil gas purification system. The system comprises an adsorption device, a stabilizer, a vacuum pump, a controller, a heat exchanger and a catalytic oxidation device, wherein the adsorption device is provided with a first air inlet pipe, a second air inlet pipe, a first air outlet pipe and asecond air outlet pipe; the adsorption device is communicated with an air inlet of the stabilizer through the first air outlet pipe; the second air outlet pipe is communicated with an air inlet of the vacuum pump; an air outlet of the vacuum pump is communicated with an air inlet of the stabilizer through a pipeline; the controller is installed on an air outlet of the stabilizer; an air outlet ofthe stabilizer is communicated with an air inlet of the heat exchanger through a pipeline; an air outlet of the heat exchanger is communicated with a low-temperature air inlet of the catalytic oxidation device through a pipeline; and a low-temperature air outlet of the catalytic oxidation device is communicated with an air inlet of the heat exchanger through a pipeline. The efficient oil gas purification system is high in purification efficiency, low in operation cost and simple in process.

The invention provides a high heat radiation cable. The cable comprises M cable cores, a heat conducting layer (30), a heat radiation sheath (50) and an external sheath (60) which are arranged from inside to outside in turn, wherein M>=3. The heat conducting layer (30) wraps the periphery of the cable cores, and the heat conducting layer (30) is provided with an internal layer contacting the cablecores and an external layer relative to the internal layer. The high heat radiation cable is characterized in that the internal layer and the external layer of the heat conducting layer (30) form theM-pointed-start-shaped fractal image in the cross section perpendicular to the length direction of the cable, the M-pointed start shape includes M acute angles pointing to the outside of the cable cores and M blunt angles pointing to the inside of the cable cores, and the perimeter ratio of the fractal image to the M-pointed start shape is greater than the area ratio of the fractal image to the M-pointed start shape. The heat conducting layer having the specific shape is arranged in the cable so that the heat radiation performance of the cable can be effectively increased without increasing the diameter of the cable, the problem of damage to the cable caused by poor heat radiation can be avoided, the risk of spontaneous combustion of the cable can be reduced, and the waste of electric energy caused by the increasing cable resistivity along with temperature increasing can also be effectively avoided.

The invention provides a cable with a cavity, and the cable sequentially comprises cavities (11, 21), M cable cores (30), an insulating layer (40), a shielding layer (50) and a protection sleeve layer(60) from the inside to the outside, wherein M is not less than three. A thermal conducting material (20) is disposed between the cavities (11, 21) and the insulating layer (40), and enables the cable cores (30) to be wrapped in the thermal conducting material (20). In a section perpendicular to the length direction of a cable, each of the cavities (11, 21) is a fractal graph shaped like an M-front-end star. The M-front-end star has M acute angles pointing to the outside of the cavities, and M obtuse angles pointing to the inside. Moreover, the perimeter ration of the fractal graph to the M-front-end star is greater than the area ratio of the fractal graph to the M-front-end star. The interior of the cable is provided with the cavities, thereby effectively improving the heat dissipation performances under the condition that the diameter of the cable is not increased, and solving a problem of cable damages caused by the poor heat dissipation. Moreover, the spontaneous combustion risk of the cable can be reduced, and the electric energy waste caused by the increase of the resistivity of the cable with the rise of temperature can be effectively avoided.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to silicon-containing powder for a lithium ion battery negative electrode material and a preparation method of the silicon-containing powder. The silicon-containing powder contains 50 to 90 weight percent of silicon, 5 to 30 weight percent of oxygen and 5 to 20 weight percent of zirconium, and the median particle size D50 of the silicon-containing powder is 110nm or less; the silicon-containing powder is analyzed through an X-ray diffraction pattern. According to a half-peak width value of a diffraction peak belonging to Si(111) near 2[theta]=28.4 degrees, and the grain size of silicon calculated by a Scherrer formula is 12nm or less. Compared with the prior art, when the silicon-containing powder prepared by the invention is used in a negative electrode material, high specific capacity and excellent cycle performance can be provided.

The invention provides a temperature detection method, device and equipment. The method comprises the following steps: periodically acquiring an initial temperature value of a target position through a thermal imaging sensor; when the target vehicle arrives at the target position, determining whether the target vehicle is a vehicle of a specified type, and if yes, acquiring a plurality of visible light images of the target vehicle through a visible light sensor; for each visible light image, based on the acquisition time of the visible light image and the acquisition time of the initial temperature value, selecting a target temperature value corresponding to the visible light image from all the initial temperature values; and determining the temperature values of a plurality of temperature measurement points of the target vehicle based on the target temperature values corresponding to the plurality of visible light images, and determining the temperature value of the target vehicle based on the temperature values of the plurality of temperature measurement points. According to the technical scheme, whether the target vehicle is the dangerous goods transportation vehicle or not is automatically determined, and high-temperature early warning in the driving process of the dangerous goods transportation vehicle is achieved.

The invention discloses a high-capacity 18650 lithium battery and a preparation process thereof, and relates to the technical field of new energy manufacturing. The lithium battery comprises a positive electrode material, a negative electrode material, an electrolyte, a shell and a diaphragm. The preparation process comprises the following steps: S1, performing dosing; S2, preparing materials; S3,performing coating; S4, performing coiling; S5, injecting liquid. During actual use, environment-friendly electrolyte is employed for preparing the lithium battery, so the lithium battery is green and environment friendly and the use capacity of the lithium battery can reach more than 85% of the theoretical capacity of the lithium battery. Moreover, the safety, the charge-discharge rate and the comprehensive performance of the lithium battery completely exceed national standard requirements, and the high-voltage, high-safety and high-rate charging and discharging are achieved. In addition, the spontaneous combustion risk of the battery can be effectively reduced through the added bromine-containing compound, the use safety of the lithium battery is improved, and the lithium battery is lowin cost and good in quality and has a good development prospect.