33results about How to "Reduce swelling" patented technology

The invention relates to the technical field of anion exchange membrane fuel cells, in particular to a cation remote grafting type polycarbazole anion exchange membrane and a preparation method thereof. The membrane is prepared by the following steps: condensing N-(4-bromobutyl) carbazole, N-alkyl carbazole and 2, 3-butanedione to obtain a polymer skeleton, then carrying out Menshutkin reaction on the polymer skeleton and cations to obtain polyelectrolyte, and finally carrying out ion exchange on the polyelectrolyte and sodium hydroxide. Wherein the main chain of the polymer has no unstable ether bond, so that the membrane has strong alkali resistance. The flexible overhanging side chain improves dimensional stability and increases polarity differences. Cations are grafted away from a framework, the alkali resistance of the membrane is improved, the service life is prolonged, hydrophilic / hydrophobic microphase separation is enhanced, an ion transmission channel is formed, and the ion conductivity is high. The membrane has good mechanical strength and flexibility, the tensile strength reaches 55.34 MPa, the elongation at break reaches 22.49%, the application requirements of fuel cells are met, and the membrane has excellent thermal stability and wide application prospects in alkaline anion exchange membrane fuel cells.

This invention discloses a wellbore plugging device and its operating method. The device is used to plug the casing of oil and gas wellheads under high-pressure or ultra-high-pressure testing conditions. It includes a central tube with an upper end and a lower end connected to its upper and lower ends, respectively. From the upper end to the lower end, a first conversion assembly, a sealing assembly with at least one sealing rubber sleeve, an anchoring assembly, and a second conversion assembly are sequentially fitted onto the central tube between the upper and lower ends. The first and second conversion assemblies are threadedly connected to the central tube. When the central tube is rotated clockwise or counterclockwise, the first and second conversion assemblies move towards or away from each other along the axis of the central tube. A volumetric tube is provided between the sealing assembly and the central tube, and is fixedly connected to the central tube. The upper end of the volumetric tube and the lower part of the first conversion assembly cooperate to form a bypass structure. The wellbore plugging device of this invention is reliable in operation and can withstand high-pressure sealing.

This application discloses a separator and a battery cell, relating to the field of secondary battery technology. The separator disclosed in this application includes a base layer and a coating layer located on at least one side of the base layer. The coating layer is made of a polymer, which includes primary particles and secondary particles. Before the separator comes into contact with the electrolyte, the average particle size of the primary polymer particles is A μm, and the average particle size of the secondary polymer particles is B μm. After the separator is wetted with the electrolyte, the average particle size of the primary polymer particles is C μm, and the average particle size of the secondary polymer particles is D μm. Furthermore, A, B, C, and D satisfy the following condition: 5% < (D-B) / B < (C-A) / A < 50%. The separator described in this application exhibits good electrolyte resistance and good adhesion to the electrodes.

This invention relates to a welding method for a heat spreader plate and a metal heat pipe, comprising the following steps: a cylindrical portion is integrally formed by protruding upwards from the upper end of the outer shell of the heat spreader plate corresponding to the periphery of the mounting hole; a stainless steel ring is fitted around the periphery of the cylindrical portion; the lower ends of both the metal heat pipe and the second capillary core are simultaneously inserted into the first inner cavity through the mounting hole; an annular brazing filler metal is fitted around the periphery of the cylindrical portion and stacked on top of the stainless steel ring to obtain a workpiece; the workpiece is placed in a vacuum brazing furnace for heating; during the heating process, the inner wall of the cylindrical portion is tightly fitted to the outer wall of the metal heat pipe, and the molten annular brazing filler metal is squeezed under clamping force, which greatly improves its wettability and prevents incomplete welding or local lack of fusion; during the cooling and solidification stage, the molten annular brazing filler metal is compacted during solidification, resulting in a higher weld density, no shrinkage cavities or porosity defects, and higher weld mechanical strength.

The utility model discloses a pressure-resistant rubber joint with high bearing capacity, which relates to the technical field of pipeline connection and comprises a rubber body, flange plates are mounted at two ends of the rubber body in the length direction, and pressure-bearing components are arranged on one sides, close to the rubber body, of the two flange plates and used for distributing pressure for the rubber body. When materials are conveyed, if the flow of the materials is too large and the rubber body expands, the rubber body makes contact with the pressure-bearing assembly in the expansion process, the pressure-bearing assembly divides pressure for the rubber body, then the expansion amplitude of the rubber body is reduced, the pressure borne by the rubber body during material conveying is reduced, and the service life of the rubber body is prolonged.

This utility model discloses a patient arm support device for cardiovascular care, including a base. A connecting box is fixedly connected to the top of the base. Rotating rods are rotatably connected to both sides of the inner wall of the connecting box. A support plate is sleeved on the outer wall of the rotating rods. Fixing straps are fixedly connected to both sides of the support plate. An angle adjustment mechanism is rotatably connected to the bottom of the inner wall of the connecting box. A fixing mechanism is fixedly connected to one side of the base, and a chuck bearing seat is fixedly connected to the top of the base. A worm gear is inserted into the inner wall of the bearing seat. A rocker arm is fixedly connected to one end of the worm gear. A chuck is fixedly connected to the outer wall of the rocker arm. A worm wheel is rotatably connected to the top of the base and meshes with the worm gear. A helical gear one is fixedly connected to the top of the worm wheel, and a helical gear two is sleeved on the outer wall of the rotating rod. This utility model can not only precisely control the angle of the patient's arm but also prevent accidental changes in the patient's arm position, ensuring the safety and stability of the patient's arm support.

The utility model provides a leg blood activating exercise device for fracture rehabilitation. The leg blood activating exercise device for fracture rehabilitation comprises a bed body, a first moving plate and a second moving plate are arranged at the top of the bed body, a second screw rod and a third screw rod are rotationally installed in the first moving plate and the second moving plate correspondingly, and the ends, close to each other, of the second screw rod and the third screw rod are fixedly connected; second servo motors are fixedly installed in the first moving plate and the second moving plate correspondingly, output shafts of the two second servo motors are fixedly connected with one ends of the two second screws correspondingly, and the outer sides of the second screws and the outer sides of the third screws are in threaded connection with moving connecting bases correspondingly. The leg blood activating exercise device for fracture rehabilitation has the advantages of being convenient to use, capable of conforming to the angle change of the leg and easy to operate.

This invention discloses the application of psoralen in the preparation of FFA4 receptor agonists and drugs for FFA4 receptor-related diseases. Cellular experiments show that this compound is a concentration-dependent FFA4 agonist; animal experiments show that this compound has significant efficacy in a DSS-induced colitis model, reducing DSS-induced colonic shortening, improving weight loss, and alleviating splenic swelling. This compound can be used in the preparation of FFA4 agonists and in the prevention and treatment of FFA4-related diseases such as inflammatory bowel disease.

The utility model provides a kind of electric-shock remelting's slab ingot crystallizer, including two groups of mutually symmetrical setting by corrugated working copper plate and being formed slab ingot crystallizer half module;Two groups of mutually symmetrical setting slab ingot crystallizer half module left and right ends are each equipped with connecting plate, bolt hole is equipped on connecting plate, and two groups of symmetrical setting slab ingot crystallizer half module are fixedly connected by bolt hole, and constitute slab ingot crystallizer.Combination slab ingot crystallizer by corrugated working copper plate is formed, and the working copper plate in width direction is greatly improved due to using folding process, and the deformation resistance of wide copper plate is greatly improved.Wide copper plate is decomposed into 6 strip copper plates with width W / 6 due to using corrugated process, and the working copper plate of electric-shock remelting slab ingot crystallizer is formed into corrugated structure with high stability, and the adjacent copper plate of each strip copper plate is connected in the form of fold line.

This utility model relates to the technical field of cardboard processing equipment, and in particular to a cardboard creasing wheel, which reduces the lateral stretching of cardboard, avoids the occurrence of creasing, greatly reduces enterprise costs, and ensures the neatness and aesthetics of packaging materials; it includes a lower metal wheel frame, an upper metal wheel frame, a rubber ring, and a rubber ring. The lower metal wheel frame has recessed grooves on the left and right sides of its outer wall, the surface of which is roughened. The rubber ring is installed in the recessed grooves, and the creasing line is between the two recessed grooves. The upper metal wheel frame has a groove in the middle of its outer wall, the surface of which is roughened, and the rubber ring is installed in the groove.

The application provides a method for relieving spheroidal graphite cast iron shrinkage cavity and porosity based on improving liquid inflow in casting, which relieves spheroidal graphite cast iron shrinkage cavity and porosity by improving metal liquid shrinkage when the inner gate is not closed, and specifically comprises the following steps: step S1, reducing liquid shrinkage volume when spheroidal graphite cast iron solidifies; step S2, reducing eutectic expansion volume when spheroidal graphite cast iron solidifies in a paste state; step S3, selecting corresponding cold iron specifications according to the size of the castings to be cast, calculating the position of the shrinkage cavity and porosity generated in the spheroidal graphite cast iron during pouring by simulation software, and then placing cold iron or prolonging pouring time at the position of the shrinkage cavity and porosity. The application can solve the problem that the castings are prone to defects of shrinkage cavity and porosity, thereby causing rejection, and can realize quantitative analysis for large and complex cast iron castings, so that the scheme of promoting simultaneous solidification of each part of the castings can be implemented.

The invention relates to the technical field of new energy, in particular to a composite current collector assembly and a preparation method thereof, a pole piece assembly and a preparation method thereof and a battery. The composite current collector assembly comprises an insulating layer, a conductive layer and a weld-aid coating, the conductive layer is located on at least one side of the insulating layer, the conductive layer comprises an electrode active area and a tab blank area connected with the electrode active area, and the weld-aid coating is located on the conductive layer corresponding to the tab blank area. The raw materials of the weld-aid coating comprise modified rosin, organic acid, organic amine, a wetting agent, a surface active agent and a corrosion inhibitor. By selecting the raw materials of the weld-aid coating, the traditional transfer welding procedure can be omitted, the problem that the welding process is tedious is solved, and the welding quality is good.

The invention discloses a method for improving the reliability of a phase delay film and the phase delay film, and belongs to the technical field of optics. According to the invention, the sulfur-sulfur alkyl chain-containing compound is adopted to perform molecular modification on the phase delay film, so that the adsorption and invasion rate of the phase delay film to water molecules can be reduced, and polymer swelling, plasticizing and hydrolysis effects caused by water vapor can be reduced; thermal motion of a polymer molecular chain in a high-humidity and high-temperature environment is inhibited, internal stress release and microstructure change are reduced, and then the problems of phase delay value drift, haze rising and surface physical degradation of the phase delay film in the high-humidity and high-temperature environment are solved; and the optical stability and the mechanical stability of the phase delay film in a high-humidity and high-temperature environment are improved.

The invention belongs to the technical field of postoperative cooling patches in clinical medicine, and particularly relates to a postoperative stepped continuous cooling patch which sequentially comprises a base layer, a quick-release cooling layer, a slow-release temperature stabilizing layer, a long-acting temperature slowing layer and an adhesive layer from outside to inside. The quick-release cooling layer comprises a double-layer wall material microcapsule, the core material of the double-layer wall material microcapsule is tetrafluoroethane, and the wall material of the double-layer wall material microcapsule is a polylactic acid-sodium alginate composite wall; the slow-release temperature stabilizing layer comprises menthol glyceryl ether and paraffin microspheres with the melting point of 18-20 DEG C; the long-acting temperature slowing layer is high-water-retention gel containing hyaluronic acid; the continuous cooling duration of the cooling patch is larger than or equal to 8 hours, and the cooling curve meets the conditions that the temperature is 15-20 DEG C within 0-2 hours, the temperature is 18-22 DEG C within 2-6 hours, and the temperature is 22-25 DEG C within 6-8 hours. According to the invention, the local temperature is controlled in a safe and effective interval of 15-25 DEG C, and the swelling control effect and the skin safety are both considered; meanwhile, through the design of the high-elasticity and high-fitness base material, the two hands of the patient are liberated, and cutting can be conducted to meet the movement requirements of different parts after an operation.

The application relates to the technical field of clinical nursing, and discloses a cold and hot compress nursing device for pain relief based on neurology clinical treatment, wherein the cold and hot compress nursing device for pain relief based on neurology clinical treatment comprises a shell, a cold and hot compress component arranged in the shell, a temperature transmission component arranged on the cold and hot compress component in the shell, and fixing components arranged at the bottoms of the two ends of the shell. The cold and hot compress nursing device for pain relief based on neurology clinical treatment is characterized in that: the semiconductor refrigerating sheet is installed on the mounting frame, and the semiconductor refrigerating sheet can be turned over by using the rotary fixing assembly. When a patient needs cold compress to reduce swelling and pain in the early stage of acute injury, and needs hot compress to promote blood circulation and recovery in the later stage, the cold and hot ends of the semiconductor refrigerating sheet can be turned over at will, so that the functionality of the device is improved, and the mode can be quickly switched during the treatment process when cold compress and hot compress are needed.

This invention provides a device for external expansion of soft tissue on one side of the face, comprising pairs of spaced-apart fixators, with multiple supports connected between each pair of fixators, and at least one end of each support slidably connected to a fixator. Each support is equipped with at least one elastic traction device, which is equipped with a negative pressure suction cup. In this invention, by adjusting the positions of the supports and the elastic traction device, the negative pressure suction cup periodically applies mechanical traction before surgery, causing local tissue expansion and relaxation. This mechanically induces and stimulates cell regeneration, gently expanding the soft tissue volume and providing space for subsequent filling.

This invention discloses a limb immobilization and rehabilitation training device after peripheral vascular intervention, comprising a frame, a lifting backrest, four wheels, a soft pad, two braking components, a twisting component, two massage components, and an ankle pump component. The four wheels are rotatably mounted on both sides of the frame in pairs. The lifting backrest is rotatably connected to the frame, and the soft pad is placed on the frame. Through the ankle pump component, the patient's foot is placed in the foot groove of the footplate, and an elastic band limits the foot's position. When the frame slides back and forth within the slide rail, it drives the footplate to slide. Simultaneously, under the fixation of the support, as the footplate slides, a ring makes a directional reciprocating motion along the slide groove. Under the action of the connecting rod and the support's resistance, the ring drives the footplate to complete a regular swinging motion, allowing the patient's foot to synchronously perform ankle joint flexion and extension movements with the footplate, achieving passive ankle pump training. This promotes distal lower limb blood circulation while preventing patients from being unable to perform ankle pump movements independently due to postoperative limb weakness.

This application provides a porous silicon / carbon nanotube composite anode material for lithium-ion batteries, comprising a nanoporous silicon framework with three-dimensional through-holes and hierarchical channels, within which villous carbon nanotubes are distributed and grown in situ. The preparation method involves: dealloying silicon alloy particles to create pores by generating oxide or nitride particles during the dealloying process; removing the oxides / nitrides with acid to form a nanoporous silicon framework structure with hierarchical channels; mixing this with a catalyst and a carbon source solution to obtain a silicon-carbon precursor powder; and then rapidly heating the powder in an inert atmosphere for 0.1-3 minutes to allow the catalyzed carbon source to grow in situ on the nanoporous silicon framework, forming villous carbon nanotubes, which react with the porous silicon to generate SiC and metal silicides, resulting in a porous silicon / carbon nanotube composite anode material with carbon nanotubes grown in situ within the channels. This material exhibits good cycle performance and rate performance. This application also provides a lithium battery using the above-mentioned composite anode material.

The invention relates to the field of zwitter-ion hydrogel materials, in particular to room-temperature phosphorescent zwitter-ion hydrogel as well as a preparation method and application thereof.The method relates to two crystal phases with a synergistic effect: (1) a dopant is induced to crystallize through salting-out ions, a clustered aggregate can be formed as a phosphorescent chromophore, and meanwhile, by means of a rigid structure of a crystalline region, the phosphorescent chromophore can be formed; non-radiative transition is inhibited to realize room-temperature phosphorescence emission; (2) a hydroxyl / carboxyl-containing polymer is introduced, a polymer crystal region is formed based on an interchain hydrogen bond, and the crystal region can significantly improve the swelling resistance of the hydrogel and dissipate energy in the deformation process of the hydrogel. The preparation of the full-color room-temperature phosphorescent zwitter-ion hydrogel can be realized by additionally doping other fluorescent molecules with different colors. The problems that existing zwitterionic hydrogel is free of phosphorescence and poor in mechanical property and water resistance are solved. By utilizing the multicolor phosphorescence and conductivity of the material, the material is applied to underwater dual-channel information interaction and underwater biological motion monitoring.

The invention belongs to the technical field of medical auxiliary equipment, and discloses an intelligent cervical endoscopic diagnosis auxiliary device, which comprises an upper expansion page and a lower expansion page, the upper expansion page and the lower expansion page are consistent in shape and size and are symmetrically arranged up and down, in addition, the intelligent cervical endoscopic diagnosis auxiliary device also comprises two connecting frames which are arranged on one side of the upper expansion page and are L-shaped as a whole, and an upper expansion page and a lower expansion page which are symmetrically arranged up and down; the fixing frame is installed on one side of the lower expansion hinge, and the connecting frame is arranged in the fixing frame in a penetrating mode; the adjusting assembly is arranged at the position, close to the lower end, in the fixing frame and used for dynamically adjusting the vertical height of the connecting frame and adapting to intelligent adjustment of the real-time opening and expanding degree of the upper expanding hinge and the lower expanding hinge; the buffering assemblies are vertically mounted at the top of the upper expanding page and the bottom of the lower expanding page and used for buffering vaginal dilatation, and long-term discomfort of a patient is avoided; the cervical endoscope has the advantages that the swelling discomfort of a patient is reduced during cervical endoscope, and the bad experience of seeing a doctor of the patient is relieved.

The invention belongs to the technical field of self-assembled microsphere arrays, and particularly relates to a pore-adjustable and stable self-assembled microsphere array as well as a preparation method and application thereof. The microsphere array disclosed by the invention is self-assembled in a manner of combining electrostatic mediation and covalent coupling, and contact among the microspheres is guided by virtue of electrostatic interaction, so that guidance is provided for realizing controllable covalent coupling among the microspheres by virtue of Schiff base reaction. The combination of covalent coupling and electrostatic force can improve the flexibility of the microsphere array and the stability of the combination between the microspheres, so as to improve the stability of pores between the microspheres, reduce the collapse of the microsphere array, provide a good and controllable three-dimensional space for the creeping growth of cells, and facilitate the promotion of wound healing and growth. The self-assembled microsphere array is suitable for application modes such as smearing or injection, and the scene applicability is greatly improved.

This invention belongs to the field of traditional Chinese medicine compound technology, and discloses a traditional Chinese medicine compound and mask preparation for anti-inflammatory, soothing and repairing facial dermatitis. The traditional Chinese medicine compound is made from the following traditional Chinese medicines in parts by weight: purslane: 10-15 parts, phellodendron bark: 10-12 parts, burnet root: 10-12 parts, and licorice root: 6-10 parts. This invention selects four medicinal materials—purslane, phellodendron bark, burnet root, and licorice root—and formulates them in a clear and coordinated manner. The herbs work synergistically, addressing both the symptoms and the root cause. It can clear heat and dampness, cool the blood and detoxify, and also has modern pharmacological activities such as anti-inflammatory and antibacterial effects, and promotes wound healing. It can effectively improve various skin lesions such as erythema, swelling, itching, and burning in facial dermatitis. Moreover, the medicine is mild, has low irritation, acts directly on the affected area, has a direct effect, and is highly safe.

The utility model relates to the technical field of air conditioners, in particular to an indoor unit and an air conditioning system, and aims to solve the problem that an existing indoor unit easily generates abnormal sound due to thermal expansion and cold contraction during startup and shutdown. In order to achieve the purpose, the indoor unit comprises a plurality of air conditioner parts which are connected with one another, and the air conditioner parts are provided with matching surfaces so as to be matched with other air conditioner parts; and in two adjacent matching surfaces, one matching surface is provided with a first micro bulge, and the other matching surface is provided with a second micro bulge. The first micro-protrusions and the second micro-protrusions can absorb a part of vibration energy in the vibration process, the vibration amplitude is reduced, the first micro-protrusions and the second micro-protrusions can transversely expand and contract in the thermal expansion and cold contraction process, the expansion amount and the contraction amount towards the air conditioner components are reduced, the displacement amount between the adjacent air conditioner components is reduced, and the air conditioner components are prevented from being damaged. And noise caused by thermal expansion and cold contraction is reduced. And the stress concentration phenomenon of the geometric edge area can be reduced, the sound of thermal expansion and cold contraction is reduced, and the user experience is improved.

The utility model relates to the technical field of medical first aid, in particular to a leg fracture fixing splint which comprises a splint body, a rotating assembly is arranged between bent portions of the two splint bodies, fixing blocks are arranged on the side walls, away from each other, of the two splint bodies at intervals, and long bandages are symmetrically arranged on the fixing block of one splint body up and down. Short bandages are symmetrically arranged on the fixing block of the other splint up and down, and square sleeves are arranged on the short bandages. The device is simple in structure and convenient for medical staff to quickly operate on an emergency site. By means of the simple steps of pulling the pull rod, rotating the clamping plates, loosening the pull rod and the like, the legs can be rapidly clamped and fixed through the two clamping plates, the device is provided with the air bag and the convertible connector, and therefore medical staff can adjust the clamping area at any time according to the leg injury condition.

The invention relates to the technical field of medicines, in particular to a gel patch capable of relieving pain as well as a preparation method and application of the gel patch. The gel patch comprises a hydrogel matrix and a traditional Chinese medicine composition loaded on the matrix, the traditional Chinese medicine composition is prepared from 10 to 20 parts of folium artemisiae argyi, 20 to 30 parts of liquorice root, 10 to 15 parts of radix angelicae sinensis, 30 to 40 parts of frankincense, 10 to 20 parts of myrrh, 15 to 20 parts of radix aconiti, 15 to 30 parts of rhizoma chuanxiong, 10 to 20 parts of flos carthami, 20 to 25 parts of herba asari, 10 to 25 parts of rhizoma curcumae longae, 10 to 30 parts of radix astragali seu hedysari and 30 to 40 parts of herba lycopodii. The gel patch can relieve different types of pains, improve local blood circulation and regulate body functions, and the traditional Chinese medicine components such as radix aconiti and lycopodium clavatum in the analgesic patch have the effects of expanding blood vessels and promoting blood circulation.

The utility model relates to ankle joint protector technical field, especially a kind of protector for ankle joint ligament repair.Its technical scheme includes: detachable ankle brace and hard ankle protector, the hard ankle protector can be used alone or cooperate with detachable ankle brace, fixed installation in hard ankle protector and cover in whole ankle joint and atmosphere bag of foot, small air bag connecting piece is movably installed on hard ankle protector, small air bag connecting piece is installed with the small air bag for providing accurate target pressing mechanics stimulation on it.The utility model adopts the design of atmosphere bag and small air bag combination.Atmosphere bag is used to eliminate lower limb ankle joint swelling, promote blood circulation through extensive pressure distribution, reduce swelling and pain.Small air bag provides accurate pressurization to ligament local, promotes the healing and regeneration of ligament through accurate mechanics stimulation.This design ensures the comprehensiveness of treatment, and improves the pertinence and efficiency of treatment.

The utility model discloses an HDI board, and relates to the technical field of circuit board design. The HDI plate comprises a substrate and a wiring layer group which are stacked, the HDI plate is provided with a laser hole group, the laser hole group is located in the wiring layer group, the central axis of each laser hole of the laser hole group extends along the thickness direction of the HDI plate, the hole length of each laser hole of the laser hole group is smaller than the thickness of the wiring layer group, and the thickness of the wiring layer group is smaller than the thickness of the substrate. And the first end of the laser hole group extends to one surface, deviating from the substrate, of the wiring layer group. According to the scheme, the problem that a laser hole of an existing HDI plate is prone to failure under the high-temperature and high-pressure conditions can be solved.

The application discloses an oil-resistant submarine valve rubber and a preparation method thereof, and belongs to the technical field of rubber sealing materials. The rubber is prepared from the following raw materials: base rubber, molybdenum disulfide nanoflower, vulcanizing agent and additive. The molybdenum disulfide nanoflower is a flower-like aggregate formed by self-assembly of molybdenum disulfide nanosheets, and has interlayer mesopores. The preparation method comprises the following steps: dissolving the molybdenum disulfide nanoflower and the base rubber in organic solvents respectively, mixing the two, co-precipitating with water to obtain rubber masterbatch, and then mixing and vulcanizing the rubber masterbatch, the vulcanizing agent and the additive to form the rubber. The molybdenum disulfide nanoflower single filler can simultaneously realize the triple functions of labyrinth barrier, interlayer mesopore oil storage and solid lubrication, can effectively inhibit the swelling of the rubber in oil-based mud, and can maintain the size stability of the conical surface seal.

The application provides a non-fluorine-coated diaphragm, a preparation method thereof, and a secondary battery. The non-fluorine-coated diaphragm comprises a base film and a composite coating layer coated on at least one side of the base film. The composite coating layer comprises a first coating layer and a second coating layer, and the first coating layer is arranged between the second coating layer and the base film. The first coating layer comprises first inorganic particles and second inorganic particles. The second coating layer comprises third inorganic particles and polymer particles. The polymer particles are non-fluorine polymers. The lower surface of the polymer particles is tangent to the first coating layer, and the polymer particles are filled in the second coating layer. When the temperature in the battery cell rises, the non-fluorine-coated diaphragm can effectively block the charging and discharging of the battery cell. When the temperature in the battery cell returns to normal, the swelling of the polymer particles decreases, the coverage of the polymer particles in the composite coating layer decreases, and the battery cell can operate normally again. The non-fluorine-coated diaphragm does not deteriorate the internal resistance and cycle performance of the battery cell, and simultaneously improves the heat resistance of the non-fluorine-coated diaphragm at high temperatures.

The application belongs to the technical field of lithium ion batteries, and provides a multilayer ceramic electrode tab and a preparation method thereof. The method comprises the following steps: sequentially coating a binder layer and an active composition layer on the surface of a current collector, and then performing heat treatment to obtain a composite; depositing a ceramic layer on the surface of the active composition layer of the composite to obtain an intermediate; and repeating the above steps to obtain the multilayer ceramic electrode tab. The application adopts a laminated mode, and can further improve the utilization rate of the battery; the active composition layer is prepared by a dry method, and the ceramic layer is deposited by an ALD deposition mode, so that the use of a solvent is avoided, and the swelling phenomenon is reduced. The application adopts a multilayer ceramic deposition mode, improves the energy density and safety of the battery, and effectively prevents lithium dendrites from directly piercing through the multilayer ceramic layer. The multilayer ceramic electrode tab provided by the application greatly improves the safety of the battery while ensuring the performance of the battery, and is suitable for large-scale use.