955 results about "Cell material" patented technology

The invention relates to a spinel multi-objective reverse design method based on machine learning and a Bayesian optimization algorithm, electronic equipment and a storage medium, and the design method comprises the steps: firstly extracting related data of a spinel material from a database, and constructing a balanced data set through preprocessing; feature engineering is carried out, a comprehensive feature set is constructed, and key features are reserved; then training a multi-target prediction model through hyper-parameter optimization by using a multi-task gradient elevator model; and finally, integrating to a Bayesian reverse design framework, expanding a design space through a specific encoder, and combining a Gaussian process proxy function and an expected hyper-volume improvement criterion to screen candidate materials meeting conditions and verify performance, thereby completing reverse design optimization. Compared with the prior art, the intelligent and efficient spinel novel multi-target reverse design method can be used for solving the problem of data scarcity, and development of high-performance spinel solar cell materials is accelerated.

The invention belongs to the field of battery materials, and discloses a high-entropy high-nickel positive electrode material which comprises a base material LiNixCoyMzO2, a base further comprises a lithium-site doping element and a nickel-site doping element, the surface of the base is coated with an island-shaped coating layer, and the island-shaped coating layer is a nano metal oxide layer. The preparation method comprises the following steps: uniformly mixing a high-nickel hydroxide precursor, a lithium source, a compound containing an element A and a compound containing an element B, carrying out two-stage sintering, mixing with a metal oxide containing an element C and a metal oxide containing an element D, and sintering to obtain the high-entropy high-nickel positive electrode material. Lithium doping in a bulk phase of the high-entropy high-nickel positive electrode material can improve the electronic conductivity of a single crystal material, increase the interlayer spacing of transition metal and inhibit lithium and nickel positive ions from being mixed, and nickel doping can improve the structural stability and thermal stability of the material, inhibit irreversible phase change of H2-H3 and stabilize lattice oxygen of the material; the doping modification of the two sites further improves the performance of the material.

The invention provides a solid-state battery performance testing method and system, and relates to the technical field of battery performance testing. According to the method, pressure is applied to the solid-state battery, the pressure value is gradually changed, in-situ CT imaging detection and electrochemical performance detection are carried out on the solid-state battery in the pressure change process, and coupling analysis is carried out on the pressure value, CT image information and electrochemical parameters; the mutual relation and evolution rule among the pressure value, the CT image information and the electrochemical parameters are summarized, so that the comprehensive performance characterization of the battery under different pressure conditions is realized, and more comprehensive and accurate data support is provided for deeply understanding the performance evolution of the battery in the actual use process; the internal relation between the internal structure change of the battery and the electrochemical performance can be disclosed, and an important theoretical basis and a guidance direction are provided for the optimization design of a battery material and the improvement of the battery performance.

The invention provides a three-junction quantum well solar cell epitaxial structure and a manufacturing method thereof, the three-junction quantum well solar cell epitaxial structure comprises a substrate serving as a first sub-cell, a first tunnel junction, a second sub-cell, a second tunnel junction and a third sub-cell which are sequentially stacked from bottom to top, and the three sub-cells are connected through the tunnel junctions; wherein the first sub-cell is a Ge cell, the second sub-cell is an InGaAs cell, the third sub-cell is a GaInP / AlGaInP quantum well cell, the third sub-cell comprises a (Al < x > 1 < Ga < 1-x > 1 < y > 1 < In < 1-y > 1 < P) back field layer, a quantum well base region, a (Al < x > 4 < Ga < 1-x > 4 < y > 4 < In < 1-y > 4 < P) emitter region and an Al < x > 5 < In < 1-y > 5 window layer which are sequentially stacked from bottom to top, the quantum well base region is composed of a Ga < x > 2 < In < 1-x > 2 layer and a (Al < x > 3 < Ga < 1-x > 3 < y > 3 < In < 1 x is larger than or equal to 0.5 and smaller than or equal to 0.8, y is larger than or equal to 0.5 and smaller than or equal to 0.8, y is equal to 0.5, the GaInP / AlGaInP quantum well structure is used for replacing a traditional AlGaInP material to serve as a top cell material, the open-circuit voltage of the solar cell is increased, and meanwhile the defect that the short-circuit current of the AlGaInP / GaAs / Ge solar cell is insufficient is overcome.

The invention provides a surface modified carbon fiber as well as a preparation method and application thereof, and belongs to the technical field of battery materials. Physical or chemical treatment on the surface of the carbon fiber is realized by performing one or more of accurate plasma treatment, chemical etching, coupling agent treatment and nano particle deposition on the surface of the carbon fiber, so that functional groups are introduced or a rough nano structure is formed; a functional layer with a specific functional group and a rough structure which are beneficial to attachment of positive electrode material slurry are formed on the surface of the carbon fiber, and then a stable and well-attached surface modified layer is obtained through heat treatment, so that the surface modified carbon fiber is prepared. According to the method disclosed by the invention, the surface roughness and the functional group richness can be improved on the premise that the mechanical property of the fiber is not obviously damaged, so that the adhesiveness and the electrical property of the positive electrode material slurry are enhanced, and a foundation is laid for the preparation of a carbon fiber positive electrode material and a structure-energy storage integrated composite structure.

The invention belongs to the technical field of battery material preparation, and particularly relates to a coated negative electrode material as well as a preparation method and application thereof. The coated negative electrode material comprises a porous carbon skeleton and a carbon coating layer coating the porous carbon skeleton, the porous carbon skeleton is provided with a plurality of holes; a silicon layer and a functional layer are attached to the surfaces of part of the holes; the silicon layer comprises silicon, the functional layer comprises a functional material, and the functional material comprises lithium aluminum fluoride. The coated negative electrode material provided by the invention has the properties of low expansion, high lithium ion conduction, few byproducts and the like, and is suitable for a solid battery; the battery energy density is ensured, and the problems that an effective lithium ion path cannot be formed due to contact failure of an active substance caused by high volume expansion of a silicon-based material in the circulation process and contact failure of the active material and a solid electrolyte in a solid-state battery, and performance degradation is caused by negative electrode side polarization increase in the circulation process are solved.

The invention discloses a topological optimization method and device for a continuous fiber periodic unit cell structure, and relates to the technical field of continuous fiber reinforced composite 3D printing. Determining the configuration of the selected periodic unit cell structure; constructing a feature component in a design domain of a periodic unit cell, performing projection on a fiber angle to calculate an elastic matrix, and determining a weight coefficient in an overlapping region based on a component level set function so as to solve an equivalent elastic matrix; solving the equivalent elastic property of the periodic unit cells of the fiber reinforced composite material; constructing a unit constitutive matrix in an interpolation format; constructing a periodic unit cell structure topological optimization model by taking the flexibility as a target function; calculating the derivative of the flexibility about the design variable formed by the artificial density of the alternative unit cell material, and carrying out sensitivity filtering treatment; optimization iterative analysis is carried out under different working conditions, and the convergence degree of an optimization result is evaluated by using an inequality relation. The problem of how to further improve the mechanical performance of the periodic unit cell structure is solved.

The present invention relates to the field of battery materials, and provides a lithium manganate cathode material coated with lithium triborate and a preparation method thereof. The cathode material is a porous lithium manganate / lithium triborate composite electrode material, which includes porous lithium manganate with a highly connected directional columnar pore structure and a lithium triborate coating covering the pore surface, with a mass ratio of (86.0~92.0):(8.0~14.0), a coating thickness of 600~800 nm, a pore diameter of 45~95 μm, and a porosity of 65~78%. The preparation method includes: preparing a precursor colloidal solution by the sol-gel method, obtaining porous lithium manganate through low-temperature freezing molding and freeze-drying, and forming a cathode substrate through pre-oxidation and high-temperature sintering; subsequently, using vacuum-assisted impregnation, ultrasound, and nitrogen pressure to promote the penetration of the lithium triborate precursor solution, and forming a uniform coating layer through gradient drying and annealing treatment. The present invention significantly improves the crystal structure stability of the cathode material, inhibits manganese dissolution, improves the cycle life and rate performance, and has wide application value.

The invention belongs to the field of battery materials, and discloses a PEO-based composite solid electrolyte and a preparation method and application thereof, the PEO-based composite solid electrolyte comprises double transition metal-based pyrophosphate, PEO and an electrolyte lithium salt; wherein the molecular formula of the double transition metal-based pyrophosphate is MaNb (P2O7) c, M is any one or two of Fe and V, N is any one or two of Pb and Cd, a is greater than or equal to 1 and less than or equal to 2, b is greater than or equal to 1 and less than or equal to 5, and c is greater than or equal to 1 and less than or equal to 4. By applying the double-transition-metal-based pyrophosphate to the solid electrolyte, the suitability of the solid electrolyte and a positive electrode material with the charging cut-off voltage of 4V or above is improved, and the application range of the solid electrolyte in a battery system with high energy density and long cycle life and a functional energy storage device is widened; and the electrochemical capacity, the structural stability and the ionic conductivity of the battery can be improved.

The present invention belongs to the technical field of battery materials, and particularly relates to a composite phosphate-based positive electrode material, and a preparation method therefor and the use thereof. The composite phosphate-based positive electrode material comprises a phosphate-based active core, wherein the outer surface of the phosphate-based active core is sequentially coated with a carbon coating layer, a nitrogen-doped carbon coating layer and a nitrogen-phosphorus co-doped carbon coating layer from inside to outside, wherein the carbon coating layer can improve the electronic and ionic conductivity of the composite positive electrode material, and optimize the particle size and morphology of the composite positive electrode material. The nitrogen-doped carbon coating layer improves the consistency and integrity of coating; and nitrogen-atom-doped carbon further enhances the electronic conductivity and lithium-ion diffusion of the carbon coating layer. Electron-rich clouds of P and N atoms in the nitrogen-phosphorus co-doped carbon coating layer can provide a rich conductive network, mutual contact is formed among different particles to form a series network, thus promoting the interfacial electron transport of the composite material during a charging and discharging process, and improving the cycling and rate performance of the composite phosphate-based positive electrode material during the charging and discharging process.

The invention provides a reverse particle size analysis method and system for a lithium ion battery, and the method comprises the steps: carrying out the detailed disassembly, cleaning, adhesion, stripping and high-temperature treatment of a to-be-analyzed cell, can accurately analyze the particle size distribution of an electrode active material in the positive and negative electrode materials of the lithium ion battery, guarantees the purity and activity of the electrode active material, and improves the detection accuracy. Therefore, the particle size analysis result is more accurate and reliable. According to the invention, the performance of the battery material is optimized, the safety of the battery is improved, the service life of the battery is prolonged, and important data support is provided for research, development and improvement of the battery material.

The invention provides a deviation rectification prediction method and device for the tail of a battery core material head and electronic equipment. The deviation rectification prediction method comprises the steps that the current initial offset of a to-be-predicted position on a material line of the tail of a target battery core head relative to a preset reference position before winding is started is collected; obtaining a historical initial offset of a to-be-predicted position on a historical battery cell stock line relative to a preset reference position before winding is started, a corresponding historical deviation correction amount after winding is finished and an actual offset of the historical stock line; determining a target deviation correction influence coefficient according to the current initial offset and the historical initial offset; and the target deviation correction influence coefficient acts on the historical deviation correction amount and the actual offset of the historical stockline, and the predicted offset of the to-be-predicted position on the target stockline is determined. The stockline deviation value can be obtained through a prediction algorithm before winding is started, the deviation correction mechanism is driven to complete prediction compensation in advance, error accumulation caused by lagging response afterwards is avoided, and interference caused by error drift and inaccurate calibration of equipment is eliminated.

The invention discloses a negative plate, a preparation method thereof and a solid-state battery, and relates to the technical field of battery materials. The disclosed negative plate comprises a current collector, and a bottom layer with the thickness of 10-50 [mu] m, a middle layer with the thickness of 10-50 [mu] m and a surface layer with the thickness of 10-50 [mu] m which are sequentially arranged on the surface of the current collector, the bottom layer comprises the following components in percentage by mass: 1-30% of small-particle-size solid electrolyte and 0.5-3 microns of D50; the component of the middle layer comprises medium-particle-size solid electrolyte, the mass ratio of the medium-particle-size solid electrolyte is 5-30%, and D50 is 3-5 [mu] m; the component of the surface layer comprises a large-particle-size solid electrolyte, the mass ratio of the large-particle-size solid electrolyte is 5-30%, and D50 is 5-10 [mu] m. Compared with a common negative plate, the negative plate provided by the invention optimizes the ion transmission path, relieves the interface stress and improves the electrochemical performance.

The invention belongs to the technical field of battery materials, and particularly relates to a ternary positive electrode material and a preparation method and application thereof.The preparation method of the ternary positive electrode material comprises the following steps that 1, a nickel source, a cobalt source, a manganese source and a lithium source are mixed according to the molar ratio of Li: Ni: Co: Mn = x: a: z: c and then subjected to first-time calcination, and a first-time sintered material is obtained; (2) a lithium source and a cobalt source are supplemented on the basis of the primary sintered material, so that the total molar ratio of Li to Ni to Co to Mn is y: a: b: c, a fluxing agent is added, mixing is performed, secondary calcination is performed, a secondary sintered material is obtained, 0.5 < = a < = 0.95, 0.01 < = b < = 0.3, 0.03 < = c < = 0.3, 0.8 < = x < = 1.15, 0 < = z < = 0.3, 1.0 < = y < = 1.5, z < = b, and x < = y; and (3) mixing the coating additive with the secondary sintered material, and performing third calcination to obtain the ternary positive electrode material.

The invention discloses a battery material database construction method and system. The method comprises the following steps: manually inputting raw material and battery material information; automatically acquiring experimental data of the battery material; converting the acquired unstructured warehousing data into structured warehousing data; carrying out model training, testing and evaluation to obtain an optimized model; on the basis of the optimized model, online analysis is carried out on warehousing data, and the potential relation between the performance and the characteristics of the battery material is searched for actual prediction or classification tasks. According to the method and the system, the integrity and the richness of database information are ensured by collecting the relevant information of the whole life cycle of the battery material, a solid data foundation is laid for application, and by performing data mining and analysis on the warehousing data, the safety of the battery material is improved. And a scientific basis is provided for performance evaluation, life prediction and formulation of a personalized research and development scheme of the battery material.

The invention belongs to the technical field of battery material preparation, and particularly relates to a negative electrode material based on magnetic field treatment and a preparation method and application thereof. Mixing a binder, a conductive agent and an active substance to prepare slurry; wherein the active substance comprises a silicon negative electrode material, a magnetic layer coated on the surface of the silicon negative electrode material and a carbon nanotube coated on the surface of the magnetic layer; and coating a current collector with the slurry, and then drying in the presence of a magnetic field to obtain the negative electrode material. The carbon nanotubes are directionally arranged through the magnetic field and the magnetic layer, the three-dimensional connectivity of an electrode conductive network is remarkably improved, and the lithium ion transmission dynamics and the electrode structure stability can be effectively enhanced in combination with an interface modification effect brought by element doping. The lithium ion battery designed based on the negative electrode has remarkable advantages in the aspects of energy density, rate capability and cycle life, and is suitable for various mobile electronic equipment, electric vehicles and other electric devices.

The invention provides a polymer electrolyte membrane and a preparation method and application thereof, and relates to the technical field of battery materials, the preparation method of the polymer electrolyte membrane comprises the following steps: dissolving a polymer, a metal organic acid salt, a plasticizer and a lithium salt in an organic solvent to obtain a polymer electrolyte slurry; coating a template with the polymer electrolyte slurry, performing standing treatment under the action of an external magnetic field, and performing vacuum drying treatment to obtain a polymer electrolyte membrane; wherein the direction of the external magnetic field is perpendicular to the template. The polymer electrolyte membrane provided by the invention is used for modifying lithium metal, so that not only can the ion transmission performance of a solid electrolyte / lithium metal interface be improved, but also the interface impedance of the solid electrolyte / lithium metal interface can be reduced.

The application provides a negative electrode material and a preparation method thereof and a secondary battery, and relates to the technical field of battery materials. The negative electrode material comprises a silicon-based inner core and a carbon layer coated on the surface of the silicon-based inner core, wherein the silicon-based inner core comprises nanosilicon and a silicate containing a metal element M; the negative electrode material is subjected to section analysis and energy spectrum analysis, and meets the conditions of k1<=10, k2<=5 and 0.1 The preparation method of the negative electrode material comprises the following steps: heating and evaporating pre-disproportionated silicon monoxide material and M metal source material to obtain silicon monoxide gas and metal source gas; mixing and condensing the two kinds of gas to obtain an inner core material; and performing carbon coating treatment to obtain the negative electrode material. In the negative electrode material prepared by the application, the metal silicate effectively separates the nanosilicon domain and the silicon oxide domain, and is uniformly distributed, and the negative electrode material has high initial efficiency and excellent cycle performance.

The invention discloses a polymer electrolyte composite material for a high-temperature-resistant solid-state battery and a preparation method of the polymer electrolyte composite material, and belongs to the technical field of solid-state battery materials. The preparation method comprises the following steps: preparation of key functional components, preparation of a precursor solution, dispersion and compounding of the filler, film casting and heat treatment, and post-treatment. A dynamic thioether bond is introduced into a main chain to construct an oxygen-sulfur synergistic coordination network, and a multi-component interface chemical bonding and gradient curing process is combined, so that the problems that the ionic conductivity and the mechanical strength of the traditional polymer electrolyte cannot be considered at a high temperature, the filler is easy to agglomerate, the membrane has many defects and the like are solved; the obtained material still keeps high ionic conductivity and excellent mechanical stability at 150 DEG C, has a wide electrochemical window, and is suitable for high-safety and high-energy-density solid-state batteries.

The invention discloses a high-entropy cobalt-free lithium-rich manganese-based positive electrode material as well as a preparation method and application thereof, and relates to the technical field of battery materials. The preparation method comprises the following steps: weighing compounds of Mn, Ni and M according to the molar ratio of each element in the material composition Li1 + xMnaNibMcO2 + delta to prepare a mixed aqueous solution; wherein M is at least three of Mg, Al, Sn, Ti, Zr, Nb, Mo, W, Y, Fe and V; reacting the mixed aqueous solution with a precipitator and a complexing agent to obtain a precursor material; carrying out ball milling and mixing on the precursor material, a Li compound and a two-dimensional MXene nano material to obtain a mixed material; and carrying out Joule heat treatment on the mixed material, under the condition of abandoning the cobalt element, the stability and electrochemical performance of the material are greatly improved, the production cost is reduced, the production period is shortened, and the technical problem that a traditional lithium-rich material needs to depend on the cobalt element to stabilize the structure is solved.

The invention discloses a perovskite solar cell based on a cross-linked interface passivation layer, and relates to the technical field of photovoltaic cell materials. The perovskite solar cell sequentially comprises a transparent conductive substrate, an electron transport layer, a perovskite light absorption layer, a crosslinking interface passivation layer, a hole transport layer and a metal electrode from bottom to top, and the cross-linked interface passivation layer is made of a 4-[10-(4-{(1, 2, 2-trifluorovinyl) oxy} phenyl)-10H-phenoxazine-2-yl] phenylphosphonic acid material. The cross-linked interface passivation layer can significantly improve the photovoltaic performance and stability, the intrinsic stability of the device is greatly enhanced by the cross-linked network, and in a double-85 aging test of 85 DEG C / 85% RH, the time required for attenuating the efficiency of the device to 80% of an initial value can exceed 1000 hours.

The present description belongs to the technical field of battery materials. Disclosed are a single-crystal ternary positive electrode material, a preparation method therefor, a positive electrode sheet and a battery. The apparent factor of the single-crystal ternary positive electrode material is [Formula 1], wherein 1.1≤Z≤3, x=D90 / D10, 2≤x≤5; S(D90) is the number averaged circularity, the total number of target particles is n, and the number averaged circularity is defined as the sum of circularity values of all of the target particles divided by n. The area and circumference corresponding to a two-dimensional projection image of a single target particle are respectively S1 and l1, the circumference of a circle having the area S1 is l2}, and the circularity = l2 / l1. The D10' is the corresponding particle size of a material obtained by compacting the single-crystal ternary positive electrode material at 200 MPa, D10 does not exceed 2.4 μm, and D10' does not exceed 2.3 μm. The single-crystal ternary positive electrode material has smooth surfaces and rounded edges, which are beneficial for fabricating batteries having excellent electrochemical properties.

The invention belongs to the technical field of micro-nano composite materials, and particularly relates to a preparation method and application of a multi-metal sulfide-expanded graphite composite material. The preparation method of the multi-metal sulfide-expanded graphite composite material comprises the following steps: recovering graphite negative electrodes of waste lithium ion batteries, constructing cross-linked porous three-dimensional expanded graphite through a controllable expansion strategy, uniformly loading multi-metal sulfide nanoparticles on the surface of the expanded graphite by adopting a hydrothermal method, and carrying out heat treatment to obtain the composite material. The three-dimensional grid structure of the expanded graphite not only provides uniformly dispersed anchoring points for the polymetallic sulfide nanoparticles, but also constructs a continuous conductive network. According to the heterogeneous interface engineering, the charge transfer resistance is reduced, and agglomeration and volume expansion of active substances in circulation are inhibited through the topological confinement effect. The polymetallic sulfide-expanded graphite composite material prepared by the method has good structural stability and electrical conductivity, and the cycling stability of a battery can be remarkably improved when the polymetallic sulfide-expanded graphite composite material is used as a battery material.

Apparatus and associated methods relate to evaluating impurity content in battery materials. In an illustrative example, a battery material impurity assessment system (BMIAS) may include a slurry mixing system and an impurity extraction system (IES). The slurry mixing system, for example, may include a motor configured to rotate a vertical axis of a slurry container. For example, the motor may pause a movement of the slurry container when the vertical axis is rotated at a predetermined angle. For example, the IES may include a translatable magnetic mass (TMM) enclosed within a sheath. For example, by operating a position of the TMM, the IES may release non-target impurity and retain target substances. In some implementations, the target substance may be ionized by an acid treatment solution rapidly without direct heating. In some implementations, the target substances may be dispersed on a conductive filter to be directly used in subsequent analysis. Various embodiments may advantageously rapid high precision and rapid impurity testing for battery manufacturing.

The invention relates to the field of battery materials, in particular to a binder material, a preparation method, a positive electrode material and a battery. The preparation method provided by the invention comprises the following steps: mixing and grinding a raw material compound and an additive into mixed powder; heating the mixed powder to a melting temperature in a protective gas atmosphere and carrying out a reaction to obtain a molten mass; the molten mass is cooled based on the rapid quenching technology, a nanocrystalline area and an amorphous area are formed in the molten mass cooling process, and a composite structure thin strip is obtained after cooling; forming a lithium-rich layer on at least part of the surface of the composite structure particle; providing a carbon source, mixing the composite structure particles forming the lithium-rich layer with the carbon source, and then carrying out heating treatment to form a carbon layer wrapping the surfaces of the composite structure particles and the lithium-rich layer; and epitaxially growing a carbon nanotube layer on the outer surface of the carbon layer, and obtaining the binder material after the epitaxial growth is completed. A novel binder material which has good ion / electron conductivity, mechanical properties adapting to volume change and suitable processing characteristics is found.

The present invention discloses a highly stable transparent fluororesin, its preparation method, and its use, belonging to the technical field of solar photovoltaic cell materials. By screening the molecular weights of ionic liquid monomers and polyionic liquids, the present invention ensures that the transparency of PVDF remains above 83% while preventing precipitation. This method can meet the requirements of photovoltaic cell materials with high transparency requirements and harsh application environments, and has promising application prospects.

The invention provides an iron-selenium double-monatomic nitrogen-doped carbon-based composite material and a preparation method and application thereof, the composite material comprises an N-doped carbon matrix, and Fe monatomic and Se monatomic distributed on the N-doped carbon matrix, and the Fe monatomic and the Se monatomic are anchored on the N-doped carbon matrix. The method comprises the following steps: preparing a Fe / Se / N-doped carbon-based precursor, and carrying out high-temperature carbonization on the Fe / Se / N-doped carbon-based precursor to obtain the iron-selenium double-monatomic nitrogen-doped carbon-based composite material. The preparation method overcomes the technical bottlenecks of low specific capacity, poor cycling stability, poor rate capability, complex preparation process, no environmental protection and the like of the existing sodium-ion battery negative electrode material. The composite material has high reversible capacity, excellent cycle stability and good rate capability, comprehensively improves the comprehensive electrochemical performance of the sodium-ion battery, provides a competitive high-performance material solution for the field of sodium-ion batteries, and practically meets the urgent demand of the current new energy field on high-performance battery materials.

The invention relates to the technical field of battery manufacturing, in particular to a production process of a diaphragm ending one-way roller based on a winding procedure, which comprises the following steps: acquiring an end face image and a side face image of a naked battery cell wound on a winding machine; based on the interlayer gap uniformity index, determining whether the interlayer gap uniformity of the naked battery cell reaches the standard or not, and according to the difference value, determining the preset pressure and the rotating speed applied to the winding machine by the one-way roller; determining whether the flatness of the side surface of the naked battery cell is qualified or not based on the microscopic fluctuation characterization parameters, and determining the preset number of rerotation turns of the winding machine and increasing the preset pressure according to the relative difference; determining whether the winding stability of the naked battery cell reaches the standard or not based on the batch gap fluctuation rate, determining to increase the tension applied to the battery cell material belt in the winding process of the next batch according to the ratio, and increasing the number of turns of rotation; and after the winding is completed, the gluing machine attaches a termination adhesive tape to the qualified naked battery cell. The winding efficiency of the naked battery cell in the winding process is improved.

The invention relates to the field of battery materials, and discloses a preparation method of a porous hard carbon material and application of the porous hard carbon material in a sodium-ion battery, the preparation method of the material comprises the following steps: S1, preparing a sucrose solution by taking sucrose as a carbon source, carrying out hydrothermal reaction treatment on the sucrose solution, and then filtering and separating to obtain a hard carbon precursor; s2, dissolving zinc salt with distilled water to prepare a solution, adding the hard carbon precursor obtained in S1 into the solution, then adding absolute ethyl alcohol into the solution, mixing and stirring at normal temperature, finally heating to evaporate the solvent to dryness, and fully grinding to obtain a uniformly mixed material containing the zinc salt; and S3, putting the material obtained in the S2 into a furnace body, heating to 600 DEG C under a protective atmosphere, carrying out primary carbonization, then heating to 1300 DEG C, carrying out high-temperature carbonization, cooling, taking out, and uniformly grinding, so as to obtain the porous hard carbon material. The material provided by the invention has the characteristics of convenient preparation method, high first-week coulombic efficiency and high specific capacity.

The invention relates to a lithium battery overheating runaway monitoring and disposing method, which comprises the following steps: S1, establishing a thermodynamic model of a lithium battery: establishing the thermodynamic model according to heat generation, heat conduction and heat convection in the battery, heat exchange between the battery and an external environment, and change of thermophysical parameters of a battery material along with temperature; s2, establishing an electrochemical model of the lithium battery: establishing the electrochemical model according to the material composition, the structural design and the working condition of the battery, the voltage, the current and the capacity of the battery in the charging and discharging process, and the influence of battery aging on the performance; s3, simulating the internal state of the battery: simulating the internal state of the battery in the charging and discharging process by combining the thermodynamic model and the electrochemical model; and S4, predicting the overheat runaway risk of the battery: establishing a prediction model of the overheat runaway risk of the battery based on the simulation result of S3, and evaluating the overheat runaway risk of the battery in real time through the prediction model.