319results about How to "Avoid puncture" patented technology

The invention relates to a multi-layer nickel net catalytic electrode for hydrogen production by alkaline electrolysis of water and a preparation method of the multi-layer nickel net catalytic electrode. The multi-layer catalytic electrode comprises multiple layers of nickel nets with different mesh numbers, and the multiple layers of nickel nets are sequentially stacked according to the mesh numbers from large to small and are sintered and formed to form the multi-layer nickel net catalytic electrode with the dense inside and the sparse outside. The preparation method comprises the following steps: sequentially stacking nickel nets with different mesh numbers according to the mesh number from large to small, and sintering; and then a raw material belt is flatly laid on the outer surface of the first layer of nickel net, stamping and electro-deposition are carried out, polishing is carried out after electro-deposition, rapid sintering is carried out, and the multi-layer catalytic electrode is obtained. Compared with the prior art, the catalytic electrode disclosed by the invention is of a structure with three layers of nickel nets which are dense inside and sparse outside, and the three layers of nickel nets are slightly melted and adhered together at high temperature to form an integral structure by adopting a vacuum sintering process, so that not only is the binding force among the nickel nets enhanced, but also the characteristics of each layer of nickel net are retained; the defects of a single-layer nickel net in the aspects of catalyst loading, mass transfer performance and mechanical strength are effectively overcome.

The invention discloses a diaphragm and a preparation method thereof, and a lithium battery, the diaphragm comprises a base membrane, and also comprises an MXene coating arranged on one side of the base membrane along the thickness direction, and an alumina coating arranged on the other side of the base membrane along the thickness direction; wherein the MXene coating layer comprises MXene modified by metal single atoms, and the aluminum oxide coating layer comprises aluminum oxide. According to the diaphragm and the metal monatomic modified MXene, the transfer speed of lithium ions in the charging and discharging process of a lithium battery can be increased, so that the electrochemical reaction speed in the charging and discharging process is increased, the requirement of high-rate charging and discharging is met, and the cycle performance of the battery is improved; aluminum oxide can enhance the mechanical strength of the diaphragm and prevent negative lithium dendrites from puncturing the diaphragm, so that thermal runaway is avoided, and the safety of the battery is improved.

The invention discloses a prostate stent and a stent conveying device, and the prostate stent comprises a stent body which comprises a plurality of stent wires; the diaphragm comprises a diaphragm sleeve and a diaphragm piece, the diaphragm sleeve is arranged on the support wire in a sleeving mode, the diaphragm piece is an elastic sheet, the diaphragm piece is in a bent wave-shaped loose state, and when the support wire is formed by twisting a plurality of strands of flat wires into a twisted shape, the diaphragm material permeates into twisted grooves and gaps between wire materials on the support wire; and drug coatings are arranged on the outer surfaces of the stent body and the diaphragm. The invention further discloses a stent conveying device. Compared with the prior art, the problem that an existing traditional prostate stent is difficult to take out after an operation is solved.

The invention relates to the technical field of new energy materials and devices, and discloses a lithium-sulfur battery difunctional diaphragm and a preparation method thereof, the lithium-sulfur battery difunctional diaphragm comprises a diaphragm substrate and a load slurry, the load slurry is coated on the surface of the diaphragm substrate; the loaded slurry comprises an electrocatalyst material, and the electrocatalyst material is a monatomic catalyst carbon-based material / diatomic catalyst carbon-based material. The monatomic catalyst carbon-based material is a nickel monatomic catalyst carbon-based material or a cobalt monatomic catalyst carbon-based material; the diatomic catalyst carbon-based material is a nickel-cobalt diatomic catalyst carbon-based material. The nickel-cobalt diatomic catalyst coupled carbon-based material is applied to the field of lithium-sulfur batteries and serves as a lithium-sulfur battery diaphragm modification material, sulfur redox kinetics can be promoted, the shuttle effect can be inhibited, lithium ion flux can be induced, so that lithium dendrite growth is inhibited, and finally the cycle performance of the lithium-sulfur batteries is improved.

The invention discloses a modified current collector and a preparation method thereof, a positive plate and a negative-electrode-free sodium ion battery, and relates to the technical field of sodium ion batteries. The aluminum oxide and the solid electrolyte sodium titanium aluminum phosphate grow on the aluminum metal three-dimensional substrate in situ, so that a higher ion conduction rate can be provided, the injection amount of the electrolyte can be reduced, the growth of dendritic crystals can be reduced, and the safety performance of the battery can be improved. The solid electrolyte (sodium aluminum titanium phosphate) and the artificial SEI film (sodium carbonate / sodium fluoride) are formed on the surface of the three-dimensional current collector, so that the deposition of sodium metal in a three-dimensional substrate is facilitated, and sodium dendrites can be prevented from growing on the surface of the current collector so as to prevent the diaphragm from being punctured. The solid electrolyte, the artificial SEI membrane and the cathode-free metal battery are used together, so that the effects of reducing the cost, prolonging the cycle life and improving the battery capacity density and safety are achieved.

The invention discloses continuous stamping production equipment for a negative electrode metal gland of a button cell, and relates to the field of button cell processing. The equipment comprises a base and a rack mounted at the top of the base, a punch forming mechanism is arranged at the bottom in the rack, and a blank feeding mechanism is arranged in the rack. According to the equipment, the punch forming mechanism is arranged, in the first stage, after an upper shearing die and a lower shearing die are used for shearing a workpiece, upward-warping burrs are formed on an outer edge opening of the workpiece, in the second stage, the middle of the outer edge of the workpiece is bent upwards through a first shaping die and a first lower shaping die, and at the moment, the burrs face inwards; in the third stage, the outer edge opening is finally formed and trimmed through the second lower trimming die of the shaping base, meanwhile, the upward sunken degree of the middle of the workpiece is gradually increased through the three stages, and therefore the workpiece with the burrs turned inwards is machined, and an insulating layer can be prevented from being punctured during button cell assembling; therefore, the yield and the processing efficiency of the battery cathode cover are improved, and the production cost is reduced.

The utility model discloses a protection structure, cell and battery, relates to battery technical field, wherein the protection structure includes base material layer, bonding layer and dissolvable layer, bonding layer is provided on the surface of base material layer, bonding surface is formed on the side of bonding layer departing from base material layer, bonding surface is used for bonding with pole piece, the bonding layer is provided with exhaust groove, the dissolvable layer is provided with dissolvable layer, the dissolvable layer is provided with dissolvable layer, the dissolvable layer is provided with dissolvable layer, the dissolvable layer is provided with dissolvable layer, and the dissolvable layer is provided with dissolvable layer. The exhaust groove penetrates through the bonding surface, the dissolvable layer is filled in the exhaust groove, and the dissolvable layer is configured to be dissolvable in the electrolyte. According to the protection structure, the battery cell and the battery disclosed by the utility model, when the protection structure is attached to the surface of the pole piece, the exhaust groove can be prevented from deforming, so that the exhaust effect of the exhaust groove is better.

The invention discloses a preparation method of a solar cell and the solar cell. The preparation method comprises the following steps: a main grid line of at least one main surface of the solar cell is formed by curing and printing low-temperature slurry, and other grid lines of the solar cell are formed by high-temperature sintering and printing high-temperature slurry except the main grid line formed by curing the low-temperature slurry. And the step of curing the printed low-temperature slurry is performed after the step of forming other grid lines. According to the scheme, the main grid lines on at least one main surface of the solar cell can be prevented from being in contact with the doping layer, so that the open voltage loss of the solar cell is effectively reduced.

The invention relates to the technical field of batteries, in particular to a lithium ion secondary battery. Comprising a positive plate, a diaphragm and a negative plate which are stacked and wound, along the winding direction, a current collector of the positive plate is provided with a positive active layer and an insulating layer; the insulating layer partially covers the positive active layer and partially covers the current collector; the insulating layer comprises first inorganic particles; the diaphragm comprises a base material layer and a ceramic layer positioned on at least one side surface of the base material layer, and the ceramic layer faces the positive plate; the ceramic layer comprises second inorganic particles; the ratio of the second Dv50 of the particle size of the second inorganic particles to the first Dv50 of the particle size of the first inorganic particles is 0.25-10, and the second Dv50 is not equal to the first Dv50. According to the lithium ion secondary battery disclosed by the invention, burrs on the positive plate are effectively reduced, the self-discharge and lithium separation problems of the battery are improved, and the cycle life of the battery is prolonged.

The utility model belongs to the technical field of medical instruments, and particularly relates to a stomach tube cleaning device for the digestive system department, which comprises a cleaning pool, a cleaning basket is placed on one side of the inner wall of the cleaning pool, two first limiting rods are fixedly connected to the inner wall of the cleaning pool, the two first limiting rods penetrate through and are in limited sliding connection with two mounting boxes, and cleaning mechanisms are arranged in the mounting boxes; according to the stomach tube cleaning device, the cleaning mechanism is arranged, a cleaning rod can penetrate into the stomach tube, the inner wall is thoroughly cleaned, the cleanliness of the stomach tube is ensured, a second limiting rod and a spring are used in cooperation, stomach tubes of different sizes can be clamped and fixed, puncture caused by bending of the stomach tube can be effectively prevented, the use safety is enhanced, and the stomach tube cleaning device is suitable for popularization and application. The stomach tube cleaning device can ensure that cleaning liquid fully covers the inner wall of a stomach tube, removes dirt and residues difficult to clean, has the advantages of efficient cleaning, high adaptability, convenience in operation, stable structure, convenience in maintenance and the like, and can remarkably improve the cleaning efficiency and quality of the stomach tube of the gastroenterology department.

The utility model relates to a rubber layer fixing device for a flexible joint of a duct piece, which is clamped and fixed at the intersection of duct piece reinforcing steel bars through a flexible joint lower connecting piece and a flexible joint upper connecting piece and comprises a rubber fixing piece, a connecting piece and a supporting rib, the rubber fixing piece is in a U shape, and a rubber layer is arranged on the inner wall of the rubber fixing piece. A threaded hole is formed in the outer side of the closed end of the rubber fixing piece. The duct piece has the advantages that the rubber layer is arranged on the inner side of the rubber fixing piece in a clamping mode, the stability of the rubber layer and the duct piece is guaranteed, the rubber layer is prevented from being separated from the duct piece, the end of the supporting rib or the end of the connecting piece is prevented from puncturing the rubber layer, the integrity of the rubber layer is maintained, and good waterproof performance is achieved; the rubber layer is connected with the duct piece reinforcing steel bar through the flexible connector lower connecting piece and the flexible connector upper connecting piece, the position of the rubber layer is fixed, and the rubber layer is prevented from moving in the duct piece pouring process.

The invention belongs to the technical field of medical instruments, and discloses a full-suture anchor assembling device, a full-suture anchor implanting device and an assembling method.The full-suture anchor assembling device comprises a clamping piece and a guiding piece, the clamping piece is provided with a clamping groove for containing an anchor body, and the guiding piece is arranged at an opening of the clamping groove and comprises two oppositely-arranged clamping pieces; the guide piece can be inserted into the fixing groove, the two clamping pieces can be far away from each other to form a guide channel, the two ends of the guide channel are communicated with the clamping groove and the fixing groove respectively, and the nail body can be clamped in the fixing groove through the guide channel. The full-suture anchor implanting device comprises an implanting rod and an operation assembly, the implanting rod can be movably and detachably connected to the operation assembly along the axis of the implanting rod, the fixing groove is formed in the end, away from the operation assembly, of the implanting rod, and the two traction lines at the two ends of the anchor body are both connected to the operation assembly. According to the assembling method, the rivet body is not damaged in the assembling process of the full-suture rivet, and the full-suture rivet implanting device is repeatedly used.

The utility model discloses a reversing device and a control system suitable for a large-specification infusion bag, and relates to the technical field of transportation structures, the reversing device comprises a mounting top plate connected to the top of a mechanism support, a rotating structure is connected to the mounting top plate, a lifting structure is connected to the rotating structure, and the bottom end of the lifting structure is connected with a clamping structure; the rotating structure comprises a mounting base connected to the mounting top plate, a rotating type air cylinder is connected to the mounting base, a rotating shaft is connected to the rotating type air cylinder and penetrates through the mounting top plate, a plane bearing is connected to the upper portion of the mounting top plate, and a self-aligning bearing with a base is connected to the lower portion of the mounting top plate. The steering device is mainly used for reversing at any angle during conveying of products with the specification of more than 1000ml in a soft bag infusion workshop, has the characteristics of simple structure, low investment cost, quick response and high positioning precision, and is suitable for conveying large-specification soft bag products which are compact in workshop layout and cannot be conveyed through a turning machine.

The invention relates to the technical field of lithium ion batteries, in particular to a lithium supplementing diaphragm and a preparation method thereof and a lithium ion battery, the lithium supplementing diaphragm comprises a porous base membrane and a lithium supplementing layer, the lithium supplementing layer is arranged on the side, facing a positive electrode, of the porous base membrane, the lithium supplementing layer comprises Li-Al alloy powder, the mass percent of Li in the Li-Al alloy powder is 0.3%-15%. According to the lithium supplementing diaphragm, the Li-Al alloy powder serves as the lithium source, the safety is high, the Li-Al alloy powder does not need to be stored and processed in the protective atmosphere, the processing difficulty of the diaphragm is reduced, and the lithium supplementing diaphragm is easier to store.

The invention belongs to the technical field of medical instruments, and particularly relates to an elastically fixed heart valve device. A resiliently secured heart valve device includes: a stent mechanism having an outer frame; and the anchoring pieces are evenly arranged on the peripheral face of the outer frame in the circumferential direction, anchoring piece openings facing the inflow end are formed between the anchoring pieces and the outer frame, and the anchoring pieces are provided with axial elastic parts capable of being axially compressed. Through the design of the axial elastic part which can be compressed axially, the anchoring part can be preset to be relatively long, after the valve is implanted, it is guaranteed that the free end of the anchoring part can effectively abut against the root of the valve ring, the anchoring part compresses the axial elastic part under the action of the valve ring, and therefore the axial elastic part can be compressed to be short under the action that the axial elastic part can be compressed to be short. And large force cannot be generated on the valve ring, so that the valve ring is prevented from being punctured by the anchoring piece.

The utility model belongs to a bridge expansion device, and particularly relates to a low-noise reinforced cantilever expansion device. Comprising a main body structure and a water stop structure, the main body structure comprises a first cantilever plate and a second cantilever plate which are oppositely anchored in concrete structures on the two sides of the expansion joint and matched in shape at the adjacent positions, and the water stop structure is arranged in the expansion joint; and the adjoining part of the first cantilever plate and the second cantilever plate adopts a broken line shape and / or a curve in the same plane. The utility model effectively solves the problems in the prior art that the edge beam profile steel is difficult to bend and form, and the forming size is difficult to control. The device has the advantages of simple and reliable structure, easiness in molding and manufacturing, low production cost, low failure rate, long service life and the like.

The invention discloses a lithium negative electrode with a multi-layer composite artificial SEI film and a preparation method and application of the lithium negative electrode, and relates to the technical field of lithium batteries. Comprising a porous material, a lithium-loving layer, lithium metal and an inorganic composite material, a lithium-loving layer and lithium metal are sequentially deposited on one side of the porous material, and an inorganic composite material is deposited on the other side of the porous material; the porous material is at least one of a porous carbon material and a porous silicon material; the inorganic composite material is at least five of LiF, Li2O, Li3N, Li2CO3, Li2S, Li10GeP2S12 and Li3PO4, and the inorganic composite material is at least five of Li2CO3, Li2S, Li10GeP2S12 and Li3PO4. According to the invention, the lithium-loving sponge-like porous structure is constructed, the lithium deposition space is increased, the growth of lithium dendrites is effectively inhibited, the SEI layer is prevented from being punctured, and meanwhile, the artificial SEI layer with high stability, excellent ionic conductivity and mechanical strength is constructed by adopting the multifunctional inorganic composite material, so that the cycle performance, the safety and the overall efficiency of the lithium battery are improved.

The utility model provides a simple umbrella cover containing device and a folding umbrella, and relates to the technical field of umbrellas, the simple umbrella cover containing device comprises a stator and a rotor rotationally connected with the stator, the stator is used for being fixedly connected with an umbrella body, and the stator and the rotor form a containing space; one end, far away from the opening, of the umbrella cover is fixed on the rotor; the side, facing the containing space, of the stator is provided with a plurality of first resistance parts used for abutting against the inner surface of the umbrella cover in a protruding mode, or the side, facing the umbrella body, of the rotor is provided with a plurality of second resistance parts used for abutting against the outer surface of the umbrella cover, and the resistance parts abut against the umbrella cover to increase winding resistance. Therefore, when the rotor rotates relative to the stator, the umbrella cover is promoted to move in the axial direction of the umbrella body and be rolled in the containing space. Therefore, the problems that an existing umbrella cover storage device is inconvenient to store and operate, complex in structure and large in size are solved.

The present application provides a diaphragm-free lithium ion battery. The battery comprises a positive electrode current collector, a positive electrode active material, a solid electrolyte, a solvent, a negative electrode active material, and a negative electrode current collector. The solid electrolyte is a solid porous organic polymer, which contains specific functional groups, including weakly coordinated anion groups, and the corresponding cation of the anion group is lithium ion. The porous polymer is a solid powder, which can act as a barrier between the positive electrode active material and the negative electrode active material, eliminating the need for a diaphragm and greatly improving the safety performance of the battery.

The invention belongs to the technical field of battery pole piece processing, and particularly relates to lithium battery pole piece surface defect detection equipment which comprises a workbench, an industrial camera and an irradiation lamp, the industrial camera and the irradiation lamp are arranged on the workbench, a supporting assembly is installed in the workbench, and an air bag protection assembly is installed on the supporting assembly. The air bag protection assembly comprises a pump body box, a high-elasticity bag body, a fixed base table, an air inlet, an air outlet and an air pressure sensor. According to the invention, air is introduced into the high-elasticity capsule body, so that the high-elasticity capsule body expands and fits the pole piece body, and when the tension of the pole piece body changes, the pole piece body starts to apply pressure to the high-elasticity capsule body and controls the exhaust port to be opened, so that air in the high-elasticity capsule body is exhausted from the exhaust port, and the volume of the high-elasticity capsule body is reduced; the high-elasticity capsule is arranged on the pole piece body to provide a buffer space for the pole piece body, and meanwhile, the high-elasticity capsule is shrunk to tighten the skin of the high-elasticity capsule, so that pole powder on the pole piece body is effectively gathered, and cracks between the pole powder on the pole piece body and a current collector due to tightening of the pole piece body are avoided.

The invention provides a portable circumference measuring device for primary school mathematics teaching, and the structure of the portable circumference measuring device comprises a circle center positioning body, a center block, straight columns, a size layer, and an edge positioning body, the circle center positioning body and the center block intersect with each other, and the right and left sides of the center block are connected with the straight columns. The lower layer of the straight column is provided with a size layer through which the edge positioning body penetrates, and the central area is also provided with a linear slide rail through which the edge positioning body slides in the size layer area; after the center block is further improved, the circle center positioning body can be detached through the circular adaptive groove in the block body, and meanwhile, the two straight columns are detached through the contact ends on the left side and the right side and the insertion grooves, so that the detachable effect is achieved; and then the situation that the original integral shape is difficult to load and carry can be replaced by simple disassembly and assembly, so that the portable characteristic can be achieved by collecting the parts through disassembly, and the situation that a large space of the schoolbag is occupied by an integral cross shape is avoided.

This utility model provides a corneal foreign body removal device, relating to the field of ophthalmic medical devices. It includes a handle, a working part, a connecting part, and a neck. The working part is fitted onto the middle of the outer wall of the handle, and the connecting part is located at one end of the handle. The neck is detachably connected to the handle via the connecting part. The device also includes a head, the tip of which is tilted at a certain angle to one side, forming a crescent-shaped curved surface. This crescent-shaped curved surface extends laterally along the inclined side to form a single-sided cutting edge. Through the cooperation of these structures, compared with existing technologies, it has the following advantages: First, the bidirectional inclined cutting edge structure significantly reduces the risk of corneal stroma tearing. The blunted rounded corners increase the contact area during device retraction, effectively avoiding secondary trauma caused by micro-movements of the eyeball and reducing the risk of corneal perforation. Second, different sizes of cutting edges can be replaced through the connecting part to adapt to differences in foreign body size, reducing the probability of misoperation due to repeated device adjustments.

The utility model provides a wafer electrical property detection device, comprising a probe card pedestal arranged on a semiconductor machine table, the probe card pedestal comprises a pedestal inner ring and a pedestal outer ring, and the pedestal inner ring is sleeved on the inner wall of the pedestal outer ring; the elastic elements are arranged on the inner ring of the base; the vacuum adsorption structure is arranged on the outer ring of the base; the probe card is arranged on one side of the probe card base, and the probe card is located on the elastic element; and the electrical test structure is arranged on the probe card, and the electrical test structure is electrically connected to the probe card. According to the wafer electrical property detection device and the semiconductor machine disclosed by the utility model, the service life of the probe card can be prolonged.

The utility model relates to the technical field of fire-fighting boots, in particular to a high-comfort fire-fighting protective boot for firefighters, which comprises a boot sole, a toe cap, a vamp, a heel and a boot leg which are integrally arranged, a waterproof sock is jointly attached to the inner surface layers of the toe cap, the vamp and the boot leg, and the boot leg comprises a leg body, a tibia protective layer, an ankle protective layer and an ankle joint bending layer. By means of the arrangement of the waterproof socks on the inner surface layers of the boot vamps and the boot legs, it is guaranteed that when a fireman works in the environments such as wading, the feet cannot be soaked by water, and the waterproof socks further have the functions of high breathability, chemical protection and blood transmission and viral pathogen resistance; meanwhile, the tibia protection layer, the ankle protection layer and the ankle joint bending layer are arranged, and the design fully considers the protection requirements of different parts of the feet of the firefighter when the firefighter executes a task, so that the firefighter can quickly respond in an emergency, and the timeliness and the accuracy of rescue actions are improved.

The utility model provides a fracture steel wire rope connecting structure for coal conveying belt replacement, and relates to the field of connecting structures, the fracture steel wire rope connecting structure comprises a connecting piece and a traction rope, the traction rope is connected to the outer side of the connecting piece, the connecting piece comprises a structural block, a fixed clamping part is connected to the outer side of the structural block, and a movable clamping part is hinged to the outer side of the structural block. Meanwhile, an electric push rod is hinged to the upper end of the structural block, the structural block comprises a receding groove formed in the outer wall, a hinge block is arranged on the outer side of the receding groove and located on the upper side of the fixed clamping part, the movable clamping part is rotationally connected with the hinge block, and the upper end of the movable clamping part is rotationally connected with the electric push rod. The connecting structure solves the problems that a connecting structure adopted for replacing an existing coal conveying belt is poor in stability, and a new belt is prone to being damaged.

The invention discloses a PCCP pipe bell and spigot joint sealing system manufacturing method and a PCCP pipe bell and spigot joint sealing system manufactured through the PCCP pipe bell and spigot joint sealing system. During manufacturing, a joint is filled with an elastic blocking piece, the elastic blocking piece is divided into a first sub-joint and a second sub-joint, and the elastic blocking piece is arranged in the joint in an abutting mode through a locking mechanism; mortar is poured into the first sub-joint through a reserved first grouting opening, and the locking mechanism is removed after the mortar does not flow; a base layer is arranged on the upper end face of an upper opening of the second sub-joint, anticorrosive paint is applied to the base layer to form an anticorrosive coating, the anticorrosive coating and the base layer form a plugging structure and seal the second sub-joint, and sealant is poured into the second sub-joint through a reserved second grouting opening; the elastic barrier piece is basically non-sticky to mortar and the like; the method is suitable for construction in the low-temperature environment, the obtained sealing system can adapt to different stress interferences and different environmental factors, lasting sealing can be achieved, the construction technology can be simplified after the anti-corrosion coating is formed in a front-arranged mode, and the construction speed is high.

The utility model belongs to the technical field of sand core casting equipment, and particularly relates to a sand core drilling tool for casting an ejector rod hole, which comprises a base, an ejector rod hole drilling device and a sand core drilling device, a plurality of limiting blocks are distributed on the upper end face of the mould, and the limiting blocks are matched with one another to form a sand core placing position; the drilling mechanisms are arranged along the horizontal direction and are respectively aligned with the corresponding processing surfaces of the sand core; the sliding mechanism is used for bearing the mould and comprises sliding rails and moving parts capable of moving back and forth along the sliding rails, and limiting parts are arranged on the sliding rails and abut against the inner sides of the moving parts to limit transverse deviation of the sand cores on the mould; wherein a thrust block is arranged in the advancing direction of the sliding mechanism and is suitable for limiting the maximum stroke of the sliding mechanism so as to limit the hole depth of the sand core and prevent the drilling depth from exceeding the thickness of the side wall of the sand core, so that a drill bit is prevented from punching through the side wall of the sand core.

The invention provides a preparation method of a high-safety composite gel electrolyte, a sodium ion battery and a preparation method thereof, and the preparation method comprises the following steps: dissolving an electrolyte sodium salt in an organic solvent to prepare a mixed solution; adding a polymer monomer, a cross-linking agent and an initiator into the mixed solution to prepare an electrolyte; the preparation method comprises the following steps: dissolving polyvinylidene fluoride co-hexafluoropropylene in dimethylformamide, then adding black phosphorus nanosheets and graphene nanosheets, carrying out primary ultrasonic treatment, and then removing a solvent to prepare a polyvinylidene fluoride co-hexafluoropropylene coated black phosphorus / graphene material; and adding the polyvinylidene fluoride co-hexafluoropropylene coated black phosphorus / graphene material into the electrolyte, and carrying out secondary ultrasonic treatment to prepare the composite gel electrolyte. According to the invention, the liquid electrolyte of the sodium-ion battery is solidified into a gel state, so that the electrolyte loses fluidity, the problems that the electrolyte of the existing sodium-ion battery is easy to leak and burn are solved, and the use requirements of the sodium-ion battery are met.

The utility model relates to new energy battery technical field and provide a kind of battery cell and power battery.The utility model discloses battery cell including pole group in battery cell shell, cover is located the battery cell cover plate of battery cell shell top, and is located between the isolating protective piece of battery cell cover plate and pole group.Isolated protective piece includes isolating sheet attached in the inside of battery cell cover plate, and protective sheet can be buckled on isolating sheet, and hot melt structure is equipped between isolating sheet and protective sheet;Isolating sheet is equipped with the pole post via hole of the pole post on battery cell cover plate, and corresponding pole post via hole, protective cavity is equipped on protective sheet;In the case where protective sheet is buckled on isolating sheet, protective sheet is fixedly connected on isolating sheet by hot melt structure, protective cavity is received in the position below the bottom of pole post for the welding of tab, and the bottom of protective cavity is protruding towards pole group and abuts on pole group.The utility model discloses battery cell, it is favorable to improve the isolation protection effect between battery cell cover plate and its pole post and pole group.

The utility model relates to the technical field of labor protection, in particular to a breathable labor protection shoe which comprises a sole and a vamp connected to the sole, and an anti-smashing cover is arranged in the portion, located on a toe cap, in the vamp. The anti-smashing cover comprises a bottom plate, an upper cover face and a lower cover face, the upper cover face and the lower cover face are connected to the bottom plate, and a crumple buffering cavity is formed between the upper cover face and the lower cover face. The upper cover face is provided with a first air hole set communicated with the crumple buffering cavity, the lower cover face is provided with a second air hole set communicated with the crumple buffering cavity, and the first air hole set and the second air hole set are arranged in a staggered mode. And a better ventilation effect is achieved.