105results about How to "Avoid fire and explosion" patented technology

The invention discloses a manufacturing process for iron-silicon-aluminum alloy powder and belongs to the technical field of metal soft magnetic materials. The manufacturing process for the iron-silicon-aluminum alloy powder includes the manufacturing steps that A, raw materials are weighed and mixed; B, a crucible is preheated; C, iron and silicon are added, aluminum is added after the iron and the silicon are completely molten, silicon-calcium alloy is added after the aluminum is molten, and the mixture is cooled into an iron-silicon-aluminum alloy block after boiling; D, the alloy block is crushed into alloy materials of 0.1-0.8 cm<2>; E, the alloy materials are subjected to ring milling, so that powder smaller than 60 meshes is obtained; F, ethyl alcohol is added, wet milling is conducted for 1-30 h, and then solid powder is obtained; G, open-area baking is conducted for 1-2 h at the temperature of 30-80 DEG C, and then screening is conducted; and H, the screened powder is placed in an annealing furnace with protective gas to be subjected to annealing heat treatment for 1-2.5 h at the temperature of 850-890 DEG C. By manufacturing the iron-silicon-aluminum alloy powder according to the above steps, burning loss of the aluminum can be reduced, the production cost is reduced, and an oven is prevented from catching a fire and exploding.

The invention provides a manufacturing process for a non-diaphragm lithium ion cell. The manufacturing process comprises the steps of coating the surface of a positive plate and/or negative plate with ceramic powder slurry; and then assembling the positive plate and the negative plate into a cell. According to the manufacturing process, the surface of the positive plate or negative plate is coated with the ceramic powder slurry; and then the positive plate and the negative plate are assembled, so that the existing diaphragm is omitted, the mechanical strength in assembling the positive plate and the negative plate is improved, the phenomenon of battery expansion and explosion caused by puncture in use of the common diaphragm is avoided, and a short-circuit phenomenon is effectively prevented; and furthermore, the non-diaphragm lithium ion cell has microporous omni-directional property, so that the requirements of electronic insulation and ionic conduction characteristic between the positive plate and the negative plate are satisfied. The invention also designs a battery applying the process.

The invention discloses a porous composite material partition and a preparation method thereof, a composite-structure cell and a lithium ion battery. The partition comprises a high-temperature-resistant resin substrate, a flame retardant and inorganic high-temperature-resistant particles, wherein the high-temperature-resistant resin substrate is composed of any one or more of a polyamide resin, a polyethylene terephthalate resin, a polyamide resin, a polystyrene resin and a polysilane resin; the flame retardant accounts for 1-15 wt% of the high-temperature-resistant resin substrate; the inorganic high-temperature-resistant particles are at least one of Al2O3, TiO2, ZrO2 and SiO2; and the inorganic high-temperature-resistant particles account for 5-15 wt% of the high-temperature-resistant resin substrate. The porous composite material partition can resist the high temperature of more than 200 DEG C, and has the advantages of flame retardancy, high temperature resistance, corrosion resistance and impact resistance. The porous composite material partition is independently formed, does not need to be applied to a pole piece or diaphragm, can not influence the pole piece or diaphragm in the forming process, and ensures the self performance and service performance of the pole piece and diaphragm.

The invention discloses an explosion-proof and flame-retardant device for a new energy automobile battery, which relates to the technical field of new energy automobile battery packs, and provides the following scheme aiming at the problems that the battery packs are easy to explode and burn after being collided: the explosion-proof and flame-retardant device comprises a mounting frame and a chassis, and four groups of mounting seats are fixedly mounted at the top of the mounting frame through bolts; a battery is placed at the top of each mounting seat, eight connecting blocks are welded to the periphery of each battery, third boxes are welded to the sides, away from the batteries, of the eight connecting blocks, movable plates are slidably connected to the inner walls of the third boxes, and two hydraulic rods are welded to the sides, away from the batteries, of the movable plates. The explosion-proof and flame-retardant device has the explosion-proof and flame-retardant effects on the battery pack, prevents the battery pack from being easily exploded and fired after strenuous vibration and collision, effectively dampens and fixes the battery pack, simplifies the battery replacement operation of the battery pack, and is high in practicability and suitable for wide popularization.

The invention discloses a flammable refrigerant air-conditioner fire protection system and an application method thereof as well as an air-conditioner. The flammable refrigerant air-conditioner fire protection system comprises a detection device (50) for detecting the environmental conditions of an outdoor unit (10) of the air-conditioner, and a control device which is connected to the detection device (50) and used for determining whether the environmental conditions are abnormal according to the environmental conditions detected by the detection device (50), and enabling a protection action when the environmental conditions are abnormal. The flammable refrigerant air-conditioner fire protection system is capable of effectively preventing fire of the outdoor unit of the air-conditioner from spreading to the indoor unit of the air-conditioner, preventing that the indoor unit of the air-conditioner is on fire and even exploded due to the fire of the outdoor unit, and improving the safety of the air-conditioner in use.

The invention provides a lithium ion secondary battery and a negative pole piece thereof. The negative pole piece of the lithium ion secondary battery comprises a negative pole current collector, a negative pole active material layer and a gas generating coating, wherein the negative pole active material layer is formed on the negative pole current collector; and the gas generating coating is formed on the negative pole active material layer. The lithium ion secondary battery comprises a positive pole piece, the negative pole piece, an isolating membrane and electrolyte, wherein the isolating membrane is arranged between the positive pole piece and the negative pole piece which are adjacent to each other. When the lithium ion secondary battery is in improper use, such as acupuncture (comprising burr piercing) and extrusion, gas generated by the gas generating coating can isolate the positive pole piece from the negative pole piece well, so that fire and even explosion caused by internal short circuit of the lithium ion secondary battery are effectively avoided; and when the lithium ion secondary battery is overcharged, the gas generated by the gas generating coating can isolate the positive pole piece from the negative pole piece well and can isolate a lithium ion conveying channel in the lithium ion battery, so that fire and even explosion caused by the lithium ion secondary battery are effectively avoided.

The invention discloses a crushing and screening device for materials. The crushing and screening device is characterized by comprising a charge device, a crushing device and a screening device, wherein the charge device is communicated with a shell; the crushing device is arranged in the shell, and provided with a filter screen at the periphery; and the screening device is located below the crushing device. Preferably, the materials are alloy sheets; the charge device comprises a charge nozzle and a loop from the filter screen to the charge nozzle; an inert gas inlet is arranged in the top of the charge nozzle and the bottom of a stainless steel elbow pipe respectively; the crushing device is provided with a drive motor; the screening device is provided with a vibration motor; the drive motor is a special frequency conversion motor; and the special frequency conversion motor is controlled by a frequency converter. The crushing and screening device disclosed by the invention is simple in structure, simple and convenient to operate overall, stable and reliable in running, low in noise, less in raising dust, good in field environment, and capable of effectively preventing frictional sparking generated by ultrafine powder grains with a pipe wall during a high-speed rotation process, thus safety performance is greatly improved.

The invention discloses an oil-immersed transformer digital non-electric quantity protection method based on pressure change quantity; the method comprises the following steps that a relay starting threshold value Pst and a protection action threshold value Pth of a protected oil-immersed transformer are set before electrification; next, a signal acquisition device collects the pressure waveform on the wall of an oil tank in real time through a pressure sensor to obtain a pressure instantaneous value P(t) at a measuring point, and whether a pressure relay is started or not is judged by makingcomparison between the pressure instantaneous value P(t) and the relay starting threshold value Pst; if the pressure relay is started, the pressure waveform of data window length when T is equal to 10ms is intercepted from the start moment, and the pressure change quantity delta P is calculated; and finally, by making comparison between the pressure change quantity delta P and the protection action threshold value Pth, the internal state of the oil-immersed transformer is accurately identified. By adoption of the method, the internal faults and external disturbance of the oil-immersed transformer can be accurately distinguished, and misoperation or rejection of the pressure protection device is effectively avoided.

The invention provides an electrode plate and an electrochemical device, the electrode plate comprises a current collector and a functional coating located on at least one surface of the current collector, and the functional coating comprises a first coating, a second coating and an active material layer which are sequentially stacked on the surface of the current collector; the first coating comprises a conductive agent, a binder and a first functional filler; the second coating comprises a conductive agent, a binder and a second functional filler; the mass ratio of the binder in the first coating to the first coating is a1, the mass ratio of the binder in the second coating to the second coating is a2, the mass ratio of the binder in the active substance layer to the active substance layer is a3, and a1 > a2 > a3. According to the invention, the safety, cyclicity and other performances of the electrochemical device can be improved.

An online repair method of a gas pipe corrugation compensator is mainly applied for the repair of a corrugation compensator on a gas overhead pipeline. The method mainly comprises the following steps of: (1) firstly stopping leaking of a leak source of the compensator; (2) selecting a new compensator which is the same as the old compensator in shape and wave number but 200 mm greater than the oldcompensator in diameter, and then averagely cutting the new compensator into eight pieces of repair materials, wherein a bleeder is welded in a wave peak in the vicinity of a cut outside one piece ofrepair material, which is 2 m higher than the wave peak; and (3) jointing the eight pieces of repair materials in field and nesting the repair materials to the periphery of the old compensator, wherein the repair material with the bleeder is sleeved to the topmost side of the preceding compensator (ensuring the bleeder to be in a vertical state). A continuous weld is employed for welding; during the welding, nitrogen is introduced into the cavity of the new compensator and the pressure of the nitrogen is 0.6 MPa; a flow rate is decided by the calibre of a pipe in which nitrogen is introduced and then coke oven gas is evicted. The online repair method disclosed by the invention cannot cause stopping of a pipeline to affect production.

The invention provides an anti-leakage bulletproof oil tank comprising an oil tank body and an oil sucking pipe mechanism. The oil tank body comprises an anti-corrosion coating, a forming metal layer, a first foam metal buffer layer, a rubber layer, a first fireproof layer, an inner steel sheet layer, a second foam metal buffer layer, a fiber fabric bulletproof layer and an outer steel sheet layer which are arranged in sequence from inside to outside. The oil sucking pipe mechanism comprises an oil sucking pipe and a sealing cover body protruding out of the outer surface of the oil tank body, an opened metal cylinder extending into the oil tank body is arranged inside the sealing cover body, and the outer side of the sealing cover body is provided with a heat dissipation mechanism. The anti-leakage bulletproof oil tank is good in bulletproof performance, the lightweight requirements of vehicles are met, oil and gas leakage and oil tank explosion can be effectively prevented, and the reliability is greatly improved.

The invention provides equipment and a method for preventing a lithium battery in a charging box from fire explosion; in order to solve a problem of preventing the lithium battery from being on fire and exploding at present, a water spraying cooling and fire extinguishing mode which is recognized to be most effective for the lithium battery is adopted, and the temperature of a battery cell is monitored, early monitoring is emphasized, early discovery is performed and water spraying cooling is intervened in advance. And out-of-control fire explosion of the lithium battery can be effectively prevented. Even if fire and explosion cannot be completely prevented, the effects of controlling the fire behavior and reducing the temperature can be achieved, and the fire disaster is completely controlled in the accident cabin. And the sharing cost is greatly reduced in a mode of sharing a water system pair with a heating system. Therefore, whether the lithium battery has a fire explosion risk or not and whether the lithium battery is out of control or not can be judged by monitoring the temperature of the battery cell of the lithium battery, and the fire explosion of the lithium battery is prevented or the damage caused by the fire explosion of the lithium battery is reduced by a method of spraying water to cool the lithium battery.

The invention discloses a multifunctional alternating current capacitor. A capacitor core is positioned in a shell; the shell is provided with a pin; the external of the pin is provided with a protective cover; the lower part of the protective cover is connected with the shell; a weight lever is arranged in the protective cover cavity; the weight lever is wrapped with an internal connecting wire; the pin is connected with the lower end of the inner connecting wire; the upper end of the inner connecting wire is welded with an outer connecting wire through an outer welding point; an inner welding point is arranged on the lower end plane of the protective cover; one side of the inner welding point is in contact with the inner connecting wire; a side plate is arranged on the other side of the inner welding point; and a spring is arranged between the side plate and the inner welding point. The multifunctional alternating current capacitor is provided with the weight lever and the outer welding point; when the outer connecting wire is heating and over-burnt, the outer welding point is melted; the inner connecting wire falls off with the weight lever to disconnect a circuit; when the capacitor is inverted, the outer connecting wire is heating and over-burnt, the heat melts the inner welding point, the spring bounces off the inner connecting wire for protecting the capacitor; and the pin is connected with the inner connecting wire by screws, and the pin is clamped with the shell, so that the pin can the inner connecting wire are convenient to replace.

The invention discloses a snap-in relay, which comprises a base, a moving contact assembly and a static contact assembly are arranged on the upper side of the base, the moving contact assembly includes a moving contact, and the static contact assembly includes a static contact point, the upper side of the dynamic and static contacts is provided with an upper insulating arc-stopper, the base and the upper insulating arc-stopper are made of ceramic materials; the movable contact includes a left movable contact and a right movable contact, the The static contact includes a left static contact and a right static contact. The upper insulating arc stopper is located on the upper side of the junction of the moving and static contacts. The length of the upper insulating arc stopper is greater than the outer edge of the left moving contact and the The maximum distance between the outer edges of the right movable contacts may be greater than the maximum distance between the outer edges of the left static contacts and the right static contacts, and the width of the upper insulating arc shield is greater than the distance between the movable and static contacts.

The invention provides a lithium ion battery membrane with heat resistance and high mechanical strength. The lithium ion battery membrane comprises a polyolefin porous base material and a porous heat-resistant layer coated on one side surface or two side surfaces of the base material, wherein the porosity of the polyolefin porous base material is 20-60%, the needling strength is greater than or equal to 200 gf, and the peel strength of the porous heat-resistant layer is greater than or equal to 10 N/m; and the porous heat-resistant layer comprises inorganic filler, a binder, a thickening agent, a dispersing agent and a wetting agent, the mass of the inorganic filler accounts for 90% or above of the mass of the porous heat-resistant layer, and the mass of the binder accounts for 4%-7% of the mass of the porous heat-resistant layer. The porous heat-resistant layer is coated on the surface of at least one side of the polyolefin porous base material, so that the heat resistance of the diaphragm is improved, the safety of the lithium ion battery is effectively improved, the phenomena of fire explosion and the like caused by thermal shock are prevented, and the problems that the thermal shrinkage rate is high and the strength is greatly reduced after heating are solved.

The invention discloses a pressure sealant and production technology thereof. The sealant comprises 100 parts of polytetrafluoroethylene as a matrix material, 20 parts of a mixture of fluorocarbon oil and dimethicone as a performance additive, 10 parts of expandable graphite as a filler, and 5 parts of carbon fibre as a reinforcing material, and is prepared through steps such as mixing and extruding. According to the invention, a polymer material of polytetrafluoroethylene is taken as the matrix material; the performance additive is screened; and the prepared novel sealant has preferable chemical stability, a low-temperature cold flow property and mouldability. Therefore, the sealant is adaptable to leakage seal of mediums with high temperature, high pressure, ultralow temperature, strong corrosivity, high dissolvability and strong oxidizability to ensure the safety and reliability of a seal construction process with temperature and pressure.

The invention discloses a lightweight electric automobile floor. The floor is of a five-layer composite structure, the five layers are fixed together by rivets and are a high-strength sheet metal, a foamed aluminum board, a high-strength sheet metal, a foamed aluminum board and a high-strength sheet metal from bottom to top in sequence, and the periphery of the floor is reinforced by adopting a vertical metallic framework in an encircled manner, so that the floor is integrated, the strength is not reduced, and the body weight is greatly reduced. The structural design is simple, a composite vehicle floor technology for alternatively superposing multiple foamed aluminum layers and multiple high-strength sheet metal layers is adopted, collision deformation of the platform floor is avoided, the passenger safety is protected, fire and explosion caused by collided deformation of a battery pack can be avoided, and energy generated by collision can be effectively absorbed. Meanwhile, the traditional foamed aluminum formula is changed, so that the lightweight electric automobile floor has an excellent energy absorption effect, and the application range of the floor is widened.

The invention discloses a damp-proof bottom plate reinforced bullet cabinet which comprises a cabinet body and a cabinet door. The cabinet door is hinged to an opening in one side of the cabinet body,a human face lock is inlaid into the cabinet door, a firearm storage box is welded on one inner side of the cabinet body, one side, close to the cabinet door, of the firearm storage box is hollow, timed operation of a dehumidifier is controlled by a time delay, so that water vapor inside the cabinet body can be removed at regular time, damage to gunpowder in a cartridge due to the water vapor inair is avoided, and the service life of the cartridge is prolonged. A drying agent storage box is additionally arranged inside the cabinet body and filled with drying agents for absorbing the water vapor inside the cabinet body, so that the inside of the cabinet body is kept dry. A reinforcing plate is additionally arranged at the bottom end of the cabinet body, the thickness of the bottom end ofthe cabinet body is increased, so that the bottom end of the cabinet body is firmer, and the dehumidifier can be more firmly mounted inside the cabinet body.