214 results about "High diaphragm" patented technology

The invention relates to the technical field of batteries, in particular to a battery. The battery comprises a diaphragm and an electrolyte, the diaphragm comprises a carrier layer and a coating, the coating comprises first particles, the components of the first particles comprise an ester group-containing polymer, and within the area of 100 [mu] m * 100 [mu] m of the surface of the coating, the number of primary particles of the first particles with the particle size smaller than or equal to 0.3 [mu] m accounts for 0.01%-4% of the number of the primary particles of the first particles; the electrolyte comprises cyclic carbonate and fluoroethylene carbonate, the weight ratio of the fluoroethylene carbonate in the electrolyte is 13%-50%, and the weight ratio of the cyclic carbonate to the fluoroethylene carbonate is (0.2-1.5): 1. According to the battery disclosed by the invention, a relatively stable and flexible SEI film is formed on the surface of the negative plate through synergistic cooperation of the diaphragm and the electrolyte, so that the interface stability between the diaphragm and the negative plate is improved, and the high-temperature long-cycle performance of the battery is improved.

In order to solve the problem of insufficient electrolyte infiltration in the middle position of a pole piece of a winding type long and narrow battery in the prior art, the utility model provides a diaphragm and a lithium ion battery, the diaphragm comprises a base membrane layer and a PVDF (Polyvinylidene Fluoride) coating layer, the PVDF coating layer is arranged on the surface of the base membrane layer and comprises a first area and two second areas, and the first area and the second area are arranged on the surface of the base membrane layer. The first area is arranged in the middle of the diaphragm, the two second areas extend from the edge of the first area to the end part of the diaphragm in the length direction, and the porosity of the first area is greater than that of the second areas. According to the diaphragm provided by the utility model, the second region with small porosity is relatively high in overall density, so that the rigidity and the tensile resistance of the diaphragm are improved, that is, through the combination of the first region and the second region, the overall wettability of the diaphragm can be improved, and the mechanical strength of the diaphragm can be ensured; the electrochemical performance and the service life of the lithium ion battery are improved.

The invention relates to the technical field of motor control, and provides a control method, system and device of a brushless direct current motor for a diaphragm pump, and the method comprises the steps: obtaining a plurality of first weight coefficients of different dimensions of diaphragm pump features and corresponding first compatibility scores; obtaining second weight coefficients of the brushless direct current motor characteristics of multiple different dimensions and corresponding second compatibility scores; acquiring system compatibility according to the first weight coefficient, the first compatibility score, the second weight coefficient and the second compatibility score; based on the system compatibility, the control strategy is dynamically adjusted, and the brushless direct current motor for the diaphragm pump is controlled. According to the method, the multi-dimensional characteristic elements of the diaphragm pump and the brushless direct current motor are comprehensively considered, the control strategy can be dynamically adjusted and optimized based on the system compatibility, the brushless direct current motor control is well matched with the system, and therefore the control reliability of the brushless direct current motor for the diaphragm pump is improved.

The invention discloses a coated diaphragm and a preparation method thereof, and belongs to the technical field of lithium batteries. The coated diaphragm comprises a base film and a coating layer, the coating layer is attached to at least partial area of the base film, and the coating layer comprises a covalent triazine framework; a covalent triazine framework is used as a component of a coating layer, the covalent triazine framework is a porous organic polymer which is good in stability, ordered in structure, strong in polarity, large in specific surface area and controllable in pore diameter, and the thermal stability of the coated diaphragm can be improved due to the good stability of the covalent triazine framework; the relatively small mass density does not have obvious influence on the energy density of the battery; due to the high specific surface area and the strong polarity, the affinity of the diaphragm to an electrolyte can be improved, and the diaphragm has higher liquid absorption and liquid retention capabilities; the nano-scale pore structure can inhibit anion migration, reduce internal polarization of the battery, improve the capacity of the battery and prolong the cycle life of the battery, thereby achieving the effect of improving the comprehensive performance of the battery.

The invention discloses a composite diaphragm as well as preparation and application thereof in a lithium ion battery, and belongs to the technical field of lithium ion battery materials. The composite diaphragm comprises a base material, at least one ceramic coating and at least one organic polymer coating, wherein the surface of the base material is coated with the at least one ceramic coating and the at least one organic polymer coating. The thickness of the ceramic coating is 1-3 m, and the thickness of the organic polymer coating is 0.3-5 m. And the ceramic coating is prepared by adopting a water-based coating process, so that the heat resistance and electrolyte wettability of the diaphragm can be improved. The organic polymer coating is prepared in an electrostatic spinning mode, and a spherical bead structure is formed by adjusting spinning parameters. Due to the fact that a large number of bead structures are contained, the prepared composite diaphragm shows stable super-hydrophobic performance. And the organic polymer has extremely high heat resistance and cohesiveness to a pole piece, and the diaphragm is endowed with extremely high porosity by the electrostatic spinning preparation process.

The invention discloses a method and a system for efficiently removing a diaphragm of a non-liquid-injected roll core and accurately separating a positive pole piece and a negative pole piece. The method comprises the following steps: S1, carrying out primary slice dissociation; s2, primary winnowing and coarse removal; s3, secondary slicing and refined hydrolysis; s4, secondary winnowing and fine removal; s5, size grading; and S6, adaptive color selection. According to the method, traditional shredding is replaced by grading slicing, structural lamination of the materials in the treatment process is fundamentally avoided, the high removal rate of the diaphragms and high-precision sorting of pole piece materials in different forms are sequentially achieved, and the purity and process efficiency of overall recycled products are remarkably improved.

The utility model relates to the technical field of diaphragm roll transportation, in particular to a battery diaphragm roll storage rack. According to the utility model, the movable base is used, so that the carrying convenience of the diaphragm roll can be improved. And the diaphragm roll can be prevented from sliding off from the cantilever rod in the transportation process while being hung by using the horizontally upwarped cantilever rod, so that the transportation stability is improved. And meanwhile, by using the reinforcing pieces, the connecting strength between the cantilever rod and the vertical frame can be improved, the situation that the connecting position of the cantilever rod and the vertical frame is deformed due to vibration in the bearing and conveying processes is avoided, and the conveying stability is further improved. And the base, the vertical frame and the cantilever rod are matched, so that the constant speed and the single-time transportation volume of the diaphragm roll can be effectively improved.

The invention provides a diaphragm combined ceramic coating, a coated diaphragm and a preparation method. The diaphragm combined ceramic coating comprises a diaphragm base membrane, a first coating, a second coating and a third coating, the first coating is coated on the surface of the diaphragm base membrane; the second coating is coated on the surface of the first coating; the surface of the second coating is coated with the third coating; the first coating and the second coating comprise one or more ceramic particles; the third coating comprises one or more organic polymer materials; the thickness range of the first coating is 0.2-2 microns; the thickness range of the second coating is 1-5 microns; the thickness range of the third coating is 0.5-3 microns; the ceramic particles are non-spherical particles, and in practical application, the self-discharge of a battery cell can be reduced, and the porosity of the battery cell can be improved, so that the liquid retention effect of the diaphragm is improved, and the electrical performance and the safety performance of the battery are improved.

A diaphragm and a preparation method thereof belong to the technical field of diaphragms. The preparation method of the diaphragm comprises the following steps: obtaining a casting sheet containing polyethylene and a pore-forming agent; and sequentially stretching and extracting the cast sheet for multiple times to obtain the diaphragm. Wherein the multiple stretching comprises transverse stretching, longitudinal stretching and two-way synchronous stretching. Or the multiple times of stretching comprise multiple times of transverse stretching and multiple times of longitudinal stretching, and transverse stretching and longitudinal stretching are alternately carried out. The multiplying power ratio of any two times of stretching is 1: (0.8-1.2), the preheating temperature of transverse stretching is 105-125 DEG C, the stretching temperature is 95-120 DEG C, and the stretching temperature is not higher than the preheating temperature. According to the method for preparing the diaphragm, high-magnification stretching can be realized, the probability of slipping and diaphragm rupture in the stretching process can be reduced, and the specific needling strength of the diaphragm can be improved.

The invention is applicable to the technical field of batteries, and provides a battery monomer, a battery, a power utilization device, a composite device, a method and processing equipment, and the processing equipment is used for processing the battery and comprises the composite device. The compounding method comprises the step of driving the compounding device to compound and fix part of the diaphragm on the first pole piece and / or the second pole piece. The power utilization device comprises a battery, the battery comprises a battery monomer, the battery monomer comprises an electrode assembly, and the electrode assembly comprises a first pole piece, a second pole piece and a diaphragm. The first pole pieces and the second pole pieces are alternately laminated or alternately laminated and wound; at least part of the diaphragm is arranged between the first pole piece and the second pole piece, and part of the diaphragm is compounded and fixed on the first pole piece and / or the second pole piece. Therefore, only one part of the diaphragm is used for compounding operation, and the other part of the diaphragm is not used for compounding operation, so that the problem of poor overall air permeability of the diaphragm can be improved, the ion conduction capability of the diaphragm is favorably improved, and the dynamic performance of the battery monomer is improved.

The invention relates to the technical field of diaphragm preparation, in particular to a preparation method of an alkaline electrolyzed water diaphragm based on non-amphoteric hydroxide. The composite alkaline electrolytic water diaphragm is prepared by selecting Fe (OH) 3, Ni (OH) 2, Mg (OH) 2 and Al (OH) 3 as inorganic fillers, and the mass ratio of the inorganic fillers to PSF to PVP is 4: 3: 2. Compared with the prior art, the method has the advantages that the content of the organic filler in the diaphragm is reduced, the chemical stability of the diaphragm is favorably improved, the operation is simple and convenient, the cost is low, the yield is high, and the diaphragm has the characteristics of low surface resistance and high air tightness.

The invention relates to the field of paper for aluminum electrolytic capacitors, and discloses a preparation method of a high-voltage low-internal-resistance electrolytic capacitor diaphragm. The whole diaphragm is prepared from high-beating-degree and high-purity insulating softwood pulp, so that high unit thickness voltage resistance can be ensured. The adopted preparation method is a continuous drying mode, the drying efficiency is higher than that of a gap drying mode, after fibers are formed and dried through a fourdrinier wire, the surface of a paper web is treated in a spraying mode, then freezing and reduced-pressure drying are adopted, a large number of fine pore structures are given to the surface of the diaphragm, and the high voltage resistance of the diaphragm is reserved; and the adsorption speed and the adsorption capacity of the diaphragm on electrolyte can be effectively improved, so that the internal resistance of the diaphragm is reduced.

The embodiment of the invention provides a diaphragm, a battery and a power utilization device, the diaphragm comprises a base film and a heat-resistant layer, and the heat-resistant layer is arranged on at least one side of the base film; the heat-resistant layer comprises a heat-resistant polymer, and after the diaphragm is subjected to heat treatment at 130-150 DEG C for 1-3 hours, the thermal shrinkage rate of the diaphragm is less than 20%. The heat-resistant layer is arranged on at least one side of the base film, so that the stability of the diaphragm at high temperature is improved. The heat-resistant layer improves the membrane rupture temperature of the diaphragm through a heat-resistant polymer, and improves the thermal shrinkage property of the diaphragm to a certain extent. Besides, the heat-resistant layer can further improve the puncture resistance of the diaphragm and improve the lithium dendrite growth inhibition capability of the diaphragm through a heat-resistant polymer, so that potential safety hazards caused by diaphragm structure damage are reduced, the heat stability of the battery diaphragm is ensured, and the safety and the cycle stability of the battery are improved.

The invention provides a diaphragm base membrane, a preparation method thereof and a secondary battery, and belongs to the technical field of energy storage. The thickness of the diaphragm base membrane is less than or equal to 5.5 microns, the diaphragm base membrane has a microporous structure, and the diaphragm base membrane simultaneously meets the following conditions: 720 < = A / L * Q < = 2000, and 6 < = A / L / Q < = 20; wherein A is the needling strength of the diaphragm base membrane, L is the thickness of the diaphragm base membrane, and Q is the tortuosity of the microporous structure. By making the thickness of the diaphragm base membrane and the tortuosity of the microporous structure meet the relational expression, the needling strength and ionic conductivity of the diaphragm base membrane can be synergistically optimized on the basis of meeting the thickness, on one hand, the yield strength of the diaphragm base membrane can be improved, so that stress concentration at the tip of dendritic crystals is directly passivated, and the performance of the diaphragm base membrane is improved; the tortuosity is in a proper range, so that the complexity of a microporous structure is increased, dendritic crystals need to bypass tortuous pores, mechanical energy consumption is increased, and the dendritic crystals are difficult to penetrate; and on the other hand, the ionic conductivity of the diaphragm base membrane is in a proper range.

The invention discloses a lithium battery diaphragm and a preparation method thereof. The diaphragm is obtained by coating a base membrane with slurry and drying. The preparation method of the slurry comprises the steps that ceramic powder, polyvinyl alcohol, a first substance and a cross-linking agent are mixed to be uniform and dried, first powder is obtained, and the first substance is nanocellulose crystals and / or sodium carboxymethyl cellulose; uniformly mixing the first powder, water and an adhesive to obtain slurry; according to the preparation method, chemical bonds are formed between the polyvinyl alcohol and the first substance and the ceramic powder through chemical crosslinking by using the crosslinking agent, so that a compact and stable three-dimensional cross-linked network structure is obtained, the solubility of the diaphragm in water is reduced, the high-temperature resistance and the wetting ability of the diaphragm are effectively improved, and the surface tension is reduced. Intermolecular hydrogen bonds can be formed between a large number of hydroxyl groups on the surface of the first substance and hydroxyl groups on a polyvinyl alcohol molecular chain to promote crystallization and limit the movement of the polyvinyl alcohol molecular chain, so that the high-temperature resistance and the wetting ability of the diaphragm are improved, and the surface tension is reduced.

The invention relates to the technical field of batteries, in particular to a composite diaphragm, a preparation method thereof and a secondary battery. The composite diaphragm comprises: a base film; the coating is arranged on the surface of at least one side of the base film in the thickness direction, and the coating comprises a composite material; the composite material comprises polyimide fibers and a solid electrolyte coating at least part of the surface of the polyimide fibers. According to the composite diaphragm, the coating of the composite diaphragm contains the composite material, so that the lithium ion flux can be improved, the lithium deposition is uniform and compact, the growth of lithium dendrites is inhibited, the thermal shrinkage performance and mechanical strength of the diaphragm can be greatly improved, and the volume change in the charging and discharging process of a lithium metal negative electrode can be coped with; and meanwhile, the use amount of the electrolyte can be reduced, so that the cycle performance, the rate capability and the safety performance of the battery are improved.

The invention discloses a diaphragm and a preparation method thereof, a battery and an electric device. The diaphragm comprises a base film and a coating arranged on at least one surface of the base film, the coating contains organic particles, the organic particles contain nonionic groups, and the volume distribution particle size Dv50 of the organic particles is 1-1.5 [mu] m. The diaphragm provided by the embodiment of the invention simultaneously has good electrolyte infiltration performance and overheating melting response characteristic, so that the barrier property of the diaphragm to transition metal is improved, and the electrochemical performance and the safety performance of the battery are improved. The preparation method can ensure stable performance of the diaphragm structure and the like. The battery comprises the diaphragm.

The present application discloses a control system for a diaphragm booster pump, which relates to the control field of the diaphragm booster pump, and includes a liquid parameter acquisition module and a preliminary analysis module. The present invention acquires data through multiple types of sensors, effectively improving the collection efficiency and accuracy of various types of data of the diaphragm booster pump, providing a scientific and reliable data basis for the subsequent control of the diaphragm booster pump, and indirectly improving the accuracy and timeliness of the control result of the diaphragm booster pump. By detecting the internal temperature, liquid temperature, and ambient temperature of the diaphragm booster pump when it is working, and systematically analyzing various types of data related to the environment, the system is regulated according to the change of the internal temperature and the liquid temperature, thereby improving the accuracy of the control result of the diaphragm booster pump while improving the energy utilization efficiency, enhancing safety and reliability.

The utility model discloses a waterproof hammer diaphragm type component of an expansion tank in the technical field of expansion tanks, which comprises an expansion tank main body, the bottom of the expansion tank main body is fixedly connected with supporting legs, and the waterproof hammer diaphragm type component can guide a diaphragm component to be placed in the expansion tank main body through the sliding connection between a guide strip and a guide plate. The mounting position of the bottom of the diaphragm assembly can be limited through clamping of the bottom of the limiting plate and the expansion tank body, the mounting position of the top of the diaphragm assembly can be limited through clamping of the extension strip and the built-in ring, the stability of the diaphragm assembly in the mounting and using process is improved, follow-up quick disassembly and replacement of the diaphragm assembly are facilitated, mixing of gas and water is avoided, and the service life of the diaphragm assembly is prolonged. Normal adjustment of the pressure of the expansion tank system is guaranteed, buffer protection can be conducted on one side of the diaphragm assembly through the spring telescopic rod and the arc-shaped elastic piece, therefore, pressure can be buffered together with elastic deformation of the diaphragm assembly, and the water hammer preventing effect is enhanced.

The utility model discloses a clockwise winding mechanism which comprises an installation structure and a winding structure installed on the outer side of the installation structure, an opening and closing air cylinder, a needle threading servo motor and an installation frame are arranged in the installation structure, and the opening and closing air cylinder and the needle threading servo motor are fixedly installed on the outer side of the installation frame. The opening and closing air cylinder and the needle threading servo motor are located at the left end and the right end of the mounting frame correspondingly, a positioning structure is arranged at the end, away from the mounting structure, of the winding structure, and a first follower, a fixing column cam groove and a fixing base are arranged in the positioning structure. According to the clockwise winding mechanism, the winding needle outer needle and the winding needle inner needle in the winding structure rotate clockwise during revolution, so that the gap between the winding needle outer needle and the diaphragm positioning roller and the gap between the winding needle inner needle and the diaphragm positioning roller can be shortened, the contact distance between the diaphragm and the diaphragm positioning roller is shortened, and the vibration amplitude of the diaphragm during rapid rotation is reduced; and the cutting precision of the diaphragm is improved.

The invention discloses a polyimide modified polyolefin composite diaphragm and a preparation method thereof, the composite diaphragm comprises a polyolefin diaphragm base material and a polyimide / ceramic particle composite coating with a porous structure arranged on one side or two sides of the polyolefin diaphragm base material, and a PI coating porous structure is constructed through a pore-foaming agent. By introducing PI, the heat resistance of the diaphragm is remarkably improved; by adding the ceramic particles, on one hand, the electrolyte wettability of the diaphragm can be further improved, better thermal stability and mechanical performance are expected, and more uniform pore distribution is generated. Lithium bromide is preferably used as a pore-foaming agent and is matched with a low-boiling-point solvent for use, on one hand, the solubility of the lithium bromide in a THF / methanol mixed solution is extremely high, and high porosity is obtained by taking the lithium bromide as a template; secondly, in the solvent drying process, lithium bromide can absorb moisture from air, and PAA is helped to be cured to construct a porous structure, so that the high-temperature-resistant composite diaphragm with excellent air permeability is obtained.

This application relates to a method, system, and storage medium for airtightness testing of a diaphragm accumulator, relating to the field of accumulator technology. The method includes acquiring preparation completion trigger information of the diaphragm accumulator; acquiring test plan information of the diaphragm accumulator based on the preparation completion trigger information; controlling a preset hydraulic system to perform a liquid filling test on the diaphragm accumulator according to the test plan information to determine pressure detection information; analyzing the pressure detection information and the test plan information to determine the liquid pressure information of the hydraulic system; determining whether the pressure detection information meets the requirements of the liquid pressure information; if it does not meet the requirements, issuing a warning according to a preset non-compliance warning message; if it meets the requirements, issuing a warning according to a preset compliance warning message. This application improves the accuracy of airtightness testing of diaphragm accumulators.

The application discloses a diaphragm with a self-layering coating, a preparation method thereof and a related secondary battery and an electric device. A battery diaphragm comprises a base film and a coating arranged on at least one surface of the base film, wherein the coating is obtained by one-time coating of a slurry, the slurry comprises an amino-modified organic silicon polymer, an amino-modified inorganic filler and an epoxy resin, the content of the amino-modified organic silicon polymer on the upper surface of the coating is denoted as V1, the content of the amino-modified organic silicon polymer on the lower surface of the coating is denoted as V2, and V1>V2. According to the embodiment of the application, the heat resistance and the adhesion of the base film can be simultaneously improved by one-time coating, and the heat shrinkage resistance of the diaphragm can be improved by the amino-modified organic silicon polymer, the amino-modified inorganic filler and the epoxy resin.

The diaphragm structure comprises a base membrane layer, ceramic layers, a first bonding layer and a second bonding layer, and the ceramic layers are coated on the two side surfaces of the base membrane layer; the surface, far away from the base film layer, of the ceramic layer is coated with a first bonding layer; the base film layer, the ceramic layer and the first bonding layer are equal in width; the edges of the two sides of the face, away from the ceramic layer, of the first bonding layer are coated with second bonding layers in the length direction of the base film layer. The edge of the first bonding layer is coated with the second bonding layer, so that the bonding capacity of the edge of the diaphragm can be effectively improved, the diaphragm and a pole piece can be highly attached in the hot pressing process of the core package, the polarization internal resistance of the lithium ion battery in circulation is reduced, and the purple edge phenomenon of the pole piece is relieved.

The invention provides a diaphragm and a lithium ion battery comprising the same, and relates to the technical field of lithium ion batteries, the diaphragm comprises a polymer, a polymeric monomer of the polymer contains F and Cl ortho-substituted phenyl, acrylonitrile and a benzene ring, the adsorption capacity of the diaphragm to an electrolyte can be improved, the interfacial compatibility of the diaphragm and the electrolyte is improved, and the performance of the diaphragm is improved. The internal resistance of the battery is reduced, dendritic crystal penetration can be effectively inhibited, and the thermal stability of the diaphragm is improved.

The utility model discloses a lithium battery diaphragm heating device and relates to the technical field of battery production. The device comprises a frame body, mounting plates are fixedly mounted in the middles of the upper end and the lower end of the frame body, lifting columns are symmetrically connected to the front side and the rear side of each mounting plate in a sliding mode, first springs are fixedly connected between the lower sides of the tops of the lifting columns and the mounting plates, and connecting plates are fixedly mounted at the adjacent ends of the lifting columns on the upper side and the lower side; threaded rods are symmetrically connected to the left side and the right side of the connecting plate in a threaded mode. The diaphragm heating device can heat the two surfaces of the diaphragm at the same time, the action temperature is kept the same, the diaphragm heating uniformity is improved, the diaphragm heating temperature is adaptively adjusted when the conveying speed of the diaphragm fluctuates, the heating uniformity is ensured, the diaphragm quality is improved, and meanwhile the diaphragm heating efficiency is improved when the conveying speed is adjusted in a small range. And the temperature of the heating plate does not need to be changed, so that the heating plate is more convenient and quicker.

The invention discloses a two-dimensional nanosheet composite solid polymer electrolyte diaphragm and preparation and application thereof, the two-dimensional nanosheet composite solid polymer electrolyte diaphragm comprises a polymer matrix, a lithium salt and an additive, the additive is a two-dimensional nanosheet which serves as a skeleton structure in the polymer matrix and is arranged in a plane array perpendicular to the diaphragm, the two-dimensional nanosheet is a composite nanosheet formed by stacking a two-dimensional inorganic material and a two-dimensional metal-organic framework material layer by layer. According to the scheme, the two-dimensional nanosheet has the characteristics that the two-dimensional nanosheet has rich functional groups and a two-dimensional structure, and directional channels can be formed between layers; according to the present invention, the two-dimensional nano-sheet can achieve the rich interaction with the polymer molecules and the lithium ions, can provide the rich ion transmission path, can effectively improve the electrochemical performance of the polymer electrolyte, can improve the mechanical property of the diaphragm through the hydrogen bond formed between the two-dimensional nano-sheet and the polymer, and can further improve the processing efficiency. The processing technology of the diaphragm has the characteristics of simplicity and convenience in operation and simple process, and is suitable for industrial production.

The invention discloses a diaphragm, a secondary battery and an electric device, and belongs to the technical field of batteries, the diaphragm comprises a polyimide film, the polyimide film contains a modified element, the modified element comprises an S element, and at least part of the S element exists in the form of-S-S-. The polyimide film comprises an S element, at least part of the S element exists in the form of-S-S-(disulfide bond), when the battery is short-circuited or locally overheated to cause the temperature of the diaphragm to be higher than or equal to 120 DEG C, the disulfide bond is broken by short circuit or high temperature to form free sulfur atoms and sulfydryl, and after the temperature is reduced to about 80 DEG C, the sulfur atom and sulfydryl are separated from each other. Sulfur atoms are recombined into disulfide bonds through diffusion to repair cracks or defects, and the disulfide bonds can trigger a fracture-recombination process through heat or an electric field to drive a macromolecular chain to slide and crosslink, so that the cracks are repaired, the thermal stability of the diaphragm is effectively improved, the thermal shrinkage of the diaphragm is reduced, and the cycling stability of the secondary battery is effectively improved.

The invention provides a construction method and application of a hydrogen refueling station diaphragm compressor diaphragm head cavity type curve model, and the method comprises the following steps: (1) obtaining a curve model of the diaphragm head cavity type curve model of a diaphragm compressor based on a single-index generatrix equation representing the contours of a gas cavity and an oil cavity of a diaphragm compressor diaphragm head and boundary conditions of the single-index generatrix equation; (2) taking the adjusting parameters corresponding to the three-index generatrix equation as variables, establishing a corresponding objective function taking the radial bending stress of the diaphragm and the volume of the diaphragm cavity as optimization objectives, and solving an optimal combination of the adjusting parameters based on the objective function to obtain a three-index generatrix equation; therefore, the radial bending stress of the diaphragm is minimum and the volume of the diaphragm cavity is maximum. According to the construction method and application of the diaphragm head cavity curve model of the diaphragm compressor of the hydrogen refueling station, the maximum diaphragm cavity volume is achieved while the minimum radial bending stress of the diaphragm is achieved, the service life of the diaphragm compressor can be prolonged, and the compression efficiency of the diaphragm compressor can be improved.

The invention provides a high-selectivity composite diaphragm for seawater electrolysis hydrogen production and a preparation method of the high-selectivity composite diaphragm, and relates to the technical field of hydrogen energy and seawater resource utilization. The composite diaphragm comprises a matrix layer, a functional layer and a protective layer. The modifier is added to improve the interior of the diaphragm and the surface structure of the diaphragm, the ion selectivity of the diaphragm is improved by adding the ion selective material, efficient screening of Cl <-> / OH <-> is achieved, and the Cl <-> rejection rate is larger than 99%; by reducing the contact angle of the diaphragm, the resistance of ions passing through the diaphragm is reduced, and the effect of reducing the surface resistance of the diaphragm is achieved; the matrix layer and / or the functional layer are / is optimally designed, the micro-nano fiber structure of the matrix layer provides mechanical support, and the bubble point pressure is larger than 5 bar; and an adhesive is added into the functional layer to enhance the interlayer binding force and prevent the coating from falling off. Therefore, the technical problems that an existing diaphragm is insufficient in chloride ion blocking capacity and low in ionic conductivity are solved, and the diaphragm is suitable for efficient and safe electrolytic hydrogen production by directly utilizing seawater.