242 results about "Current density distribution" patented technology

The invention relates to the technical field of online calibration, in particular to a multi-parameter fusion intelligent electric energy meter online calibration method and system, and the method comprises the following steps: collecting voltage waveforms, current harmonics and active power data, dividing windows, calculating a covariance matrix, and generating a feature set; a power factor curvature extreme value and a temperature inflection point offset are analyzed to generate an interference identifier, current density distribution and a voltage distortion spectrum are jointly analyzed to extract a harmonic energy ratio to generate a feature vector, and phase compensation is performed on a pulse sequence to generate a calibration instruction set. According to the method, the covariance matrix is constructed by synchronously collecting voltage and current power parameters, the abnormal mark section is generated by combining the temperature change and the covariance difference value, the environment disturbance and the real deviation are effectively distinguished, and the temperature hysteresis effect is identified through the power factor curvature extreme value and the temperature inflection point offset. And combining current density and voltage distortion spectrum analysis to extract a fundamental wave and harmonic wave energy ratio, establishing a composite calibration reference, and dynamically adjusting a pulse duty ratio to realize harmonic wave energy compensation.

The invention discloses an operation state monitoring method and system for AEM water electrolysis hydrogen production equipment, particularly relates to the technical field of electrolytic bath operation monitoring control, and aims to solve the problem of efficiency nonlinear fluctuation caused by polarization mode alternating dominance and microstructure degradation under a low current density working condition in the prior art. Extracting polarization fluctuation characteristics by generating a dynamic response sequence and calculating a dynamic coupling degree to identify a polarization alternating dominant mode; analyzing a local blocking probability based on frequency characteristics, positioning an active site sparse region in combination with temperature gradient spatial distribution characteristics, and generating an efficiency fluctuation evaluation coefficient; an active site sparse region and a dynamic compensation factor matrix of a cathode flow field pressure gradient are constructed to cooperatively adjust an anode current density distribution weight and a cathode pressure gradient parameter, so that an adjusting variable is accurately matched with a local blocking probability and a dynamic coupling degree; the multi-scale correlation analysis of the microcosmic degradation state and the macroscopic efficiency fluctuation of the electrolytic cell is realized, and the operation stability under the low current density is remarkably improved.

The invention relates to the technical field of fault diagnosis of power electronic equipment, and particularly discloses a fault analysis and diagnosis method and system for a mining high-voltage frequency converter, and the method comprises the steps: collecting the skin effect depth and parasitic parameter drift distance in real time under a high-frequency working condition through a multi-physics field sensor array; constructing three-dimensional current density distribution of the conductor based on a non-Euclidean space mesh generation technology, and dynamically correcting the equivalent resistivity of the conductor in combination with a metamaterial database to calculate a dynamic eddy current loss characteristic value; optimizing and solving the parasitic parameter time-varying evolution equation by using a quantum annealing algorithm to obtain a voltage peak sensitivity characteristic value; inputting the characteristic value into a pre-trained deep residual shrinkage network diagnosis model for multi-modal fusion analysis, and outputting a fault risk assessment result; according to the method, the problem of parasitic parameter time-varying characteristic modeling in the vibration environment is innovatively solved, and early warning of hidden faults is achieved.

The invention discloses a PCB circuit microdefect real-time detection algorithm optimization method based on artificial intelligence, and relates to the field of printed circuit board monitoring, and the method comprises the steps: collecting multi-physical field data including a temperature field, a stress field, current density distribution and corrosion medium concentration in real time; generating time-space synchronous multi-modal fusion data; quantifying a thermal-mechanical-electric-chemical field interaction relationship through an inter-field coupling coefficient matrix; generating a four-dimensional synergistic effect matrix through tensor fusion; and based on the four-dimensional synergistic effect matrix, in combination with a spatio-temporal evolution diagram output by the carbonization path prediction model, establishing a three-dimensional mapping relationship among the crack size, the carbonization path and the material residual strength, and predicting a residual life prediction value. The method has the advantages that through real-time synchronous fusion of multi-physical field data and tensor coupling modeling, accurate tracking of a crack propagation path and dynamic evaluation of the residual life are achieved, the detection sensitivity is improved, and the life prediction error is reduced.

The invention relates to the technical field of stress corrosion, in particular to a titanium alloy stress corrosion multi-scale modeling calculation method which comprises the following specific steps: S1, calculating to obtain physical property parameters of a titanium alloy; s2, calculating to obtain an equilibrium potential parameter; s3, testing to obtain a stress-strain curve and electrochemical parameters of the titanium alloy; s4, a titanium alloy stress corrosion two-dimensional model is established, a physical field is established according to the parameters obtained in the S1, the S2 and the S3 and the two-dimensional model, then a physical control equation is established, then the model is solved after boundary conditions are applied to the model, and finally a corrosion potential, stress and current density distribution cloud chart is obtained. According to the method, the stress corrosion model under different strains is obtained by taking the front-end calculation result as the input of multi-physics field finite element analysis on the basis of the calculation phase diagram model and the experiment and combining the basic theoretical models of the microscale and the mesoscale, so that the problems of long period and relatively high time cost and material cost of the stress corrosion experiment of the titanium alloy are solved.

The invention discloses a continuous prebaked anode aluminum electrolysis production method and system, and relates to the technical field of anode aluminum electrolysis production, and the method comprises the following steps: firstly, collecting current density distribution data and electrolyte distribution state in an electrolytic cell through a real-time monitoring system, and reflecting current and electrolyte conditions of each area in the electrolytic cell in real time; and data support is provided for subsequent adjustment measures. The electrolyte distribution in the electrolytic cell is monitored in real time and intelligently evaluated, intelligent evaluation is performed in combination with the deep learning model, current distribution is automatically adjusted, and it is ensured that the current density is uniform. According to the scheme, the problems of local overload, excessive consumption of the anode and overheating of equipment are effectively avoided, the energy efficiency and the stability of the electrolysis process are improved, the service life of the equipment is prolonged, the maintenance cost is reduced, the downtime is shortened, and therefore the production efficiency and the economic benefits are improved. And meanwhile, human intervention is reduced, the automation level is improved, and the intelligent management capacity of aluminum electrolysis production is enhanced.

The invention provides an optimized winding method and system for a high-frequency transformer winding. A comprehensive parameter database based on current density distribution data of a high-frequency switching power supply is established, the axial temperature of a winding layer is collected in real time in combination with a self-calibration multi-axis winding device, and tension and interlayer gap compensation parameters are generated through temperature gradient feedback. The tension parameter drives the machine to adjust the winding tightness, and the gap parameter optimizes the heat dissipation channel. And synchronously fusing the current distortion data of the LLC resonant topology and an electromagnetic field simulation result, and generating a resonant frequency adjustment signal to suppress abnormal high-frequency current distribution. And dynamic matching of winding tightness, current distribution and heat dissipation requirements is realized through cooperative control. According to the system, electromagnetic, mechanical and thermal field multi-dimensional linkage is adopted, the skin effect and hot spot concentration are reduced, the temperature rise gradient is balanced, and the high-frequency working condition stability is enhanced. According to the technical scheme, through electromagnetic, mechanical and thermal field cooperative regulation and control, the temperature rise peak value of the high-frequency winding is greatly reduced, and the efficiency is greatly improved.

The invention relates to a waveguide grating, in particular to a method for manufacturing a waveguide grating with continuous gradually-changing groove depth, which comprises the following steps of: accurately measuring and calibrating ion beam current density distribution of a used ion beam in a working plane; establishing a cooperative control model associated with a target groove depth curve, ion beam current density distribution and scanning speed, associating the etching depth with the ion beam total dose, and accurately controlling the ion beam total dose received by each point on the waveguide grating by dynamically regulating and controlling the scanning speed of the substrate relative to the ion beam, so as to realize accurate control of the etching depth. The accurate control on the groove depth distribution is realized; based on the cooperative control model, the scanning speed corresponding to the target groove depth curve is solved by combining the set target groove depth curve and the calibrated ion beam current density distribution; and performing ion beam etching based on the solved scanning speed, and finally forming a continuous gradual change groove depth accurately corresponding to the target groove depth curve on the waveguide grating. The method can effectively overcome the defect that the high-precision waveguide grating with the continuous gradually-changing groove depth is difficult to manufacture.

The invention discloses an adjustable self-cleaning electric flocculation device, and relates to the technical field of electric flocculation devices, the adjustable self-cleaning electric flocculation device comprises an electric flocculation tank, a support plate is slidably connected to the electric flocculation tank, first polar plates are uniformly arranged in the electric flocculation tank, second polar plates are arranged in the support plate in a staggered manner, and the adjustable self-cleaning electric flocculation device also comprises a polar plate spacing adjusting mechanism, a self-oscillation mechanism and a self-cleaning mechanism; the polar plate distance adjusting mechanism is arranged at the bottom of the electric flocculation tank and is used for adjusting the distance between the first polar plate and the second polar plate; the self-oscillation mechanism is arranged above the first polar plate and is used for vibrating and removing impurities from the first polar plate; compared with the prior art in which polar plates are arranged at fixed intervals, the device can be accurately matched with wastewater with different electrical conductivity by dynamically adjusting the intervals of the electrodes, so that the current density distribution is more uniform. For example, the ineffective energy consumption can be reduced by increasing the electrode spacing of the low-conductivity wastewater, and the electric field intensity can be enhanced by reducing the spacing of the high-conductivity wastewater, the dissolution efficiency of metal ions can be improved, and the treatment period can be shortened to 30-60 minutes.

The invention relates to a physical field coupling simulation analysis method and device of a circuit breaker, computer equipment, a computer readable storage medium and a computer program product. The method comprises the following steps: acquiring distributed conductivity in an arc extinguish chamber of the circuit breaker; according to the distributed conductivity and an electric field finite element equation, an electric field distribution value in the circuit breaker arc extinguish chamber is obtained through calculation; calculating a current density distribution value in the arc extinguish chamber of the circuit breaker based on the electric field distribution value; substituting the current density distribution value into an axisymmetric magnetic field equation, and performing electric field and magnetic field coupling; substituting the port boundary voltage and the port current of the arcing area of the circuit breaker into the circuit matrix equation, and carrying out electric field and circuit bidirectional coupling; the electric field finite element equation, the axial symmetry magnetic field equation and the circuit matrix equation are combined, and the potential distribution value and the magnetic field distribution value of the arcing area of the circuit breaker and the port boundary voltage and the port current of the equivalent resistor are obtained through solving. By adopting the method, the simulation analysis efficiency and precision of the circuit breaker arc extinguish chamber can be improved.

The invention discloses a flow battery performance analysis method based on current density distribution measurement, and relates to the technical field of batteries. Compared with a previous battery performance measurement technology, the problem that the data acquisition dimension is relatively narrow is solved; the sampling frequency lacks dynamic adaptability; different operation conditions and charge states are not considered; the problem of lack of comprehensive performance evaluation and prediction under multi-parameter fusion is solved; in combination with real-time environment parameters, block data and the like, data acquisition dimensions are rich and comprehensive; the key performance indexes of the battery are analyzed in real time, the sampling frequency is further adjusted according to the dynamic change conditions of the indexes in the charging and discharging process, the optimal operation conditions and the like of the flow battery are analyzed, and the subsequent optimization capability on the overall performance of the battery is improved; various technical means are fused, the performance of the battery is comprehensively evaluated from different levels, and the optimal operation mode and potential problems of the battery under different operation conditions can be mined based on the analysis and prediction result.

The invention discloses an intelligent monitoring system for predicting the service life of a high-power LED lamp bead, and relates to the technical field of intelligent monitoring, and the system comprises a data collection module for collecting the real-time current density distribution data of the high-power LED lamp bead in a working state, and a calculation module for calculating the real-time current density distribution data of the high-power LED lamp bead in a working state. The calculation module is used for calculating the hot spot position and the hot spot temperature of the lamp bead based on the current density distribution data, the analysis module is used for analyzing the influence degree of the hot spot position and the hot spot temperature on the brightness attenuation of the lamp bead, and the driving regulation and control module is used for adjusting the driving current of the lamp bead according to the influence degree, optimizing the brightness and prolonging the service life of the lamp bead; according to the intelligent monitoring system for predicting the service life of the high-power LED lamp bead, the problem of brightness attenuation caused by inconsistent current density in a long-time high-power working state in the prior art is solved.

The invention relates to a battery contact resistance in-plane distribution estimation method and device, computer equipment and a storage medium. The method comprises the following steps: operating a to-be-detected battery under a stable operation condition, and collecting current density distribution of each region in the to-be-detected battery; each region is obtained by dividing according to a cathode flow field structure and an anode flow field structure of the to-be-detected battery; when the state of the to-be-detected battery meets a preset state condition, ohmic impedance distribution identification is carried out according to the current density of each region, ohmic impedance of each region is determined, and the preset state condition is matched with the stable operation condition; and determining the contact resistance of each region according to the ohmic impedance of each region. And the membrane is completely hydrated through high-humidity and high-current stable operation of the battery, so that the membrane impedances in different areas in the surface are approximately equal. And the accuracy of identifying the contact resistance of the to-be-detected battery is improved.

The invention relates to the technical field of NV color centers, and discloses an NV color center magnetic field and current measurement method and system. The method comprises the following steps: performing decomposition and noise reduction on the two to generate target three-dimensional data, and constructing a joint response equation by combining the resonant frequency offset and the fluorescence intensity change value of the target three-dimensional data; and finally, decoupling the equation to obtain a global magnetic field estimation value, and determining a current density distribution diagram according to the value and the vacuum magnetic conductivity. According to the method, the initial signal quality is improved through the quantum coherence enhanced pulse sequence, the influence of interference such as environmental thermal noise on the magnetic field signal is effectively weakened through decomposition noise reduction and joint response equation decoupling, and the magnetic field characteristics are accurately extracted, so that high-precision data support is provided for subsequent magnetic field analysis and current density distribution determination. The technical problem that in the prior art, interference such as environmental thermal noise exists generally, so that initially-collected magnetic field signals are mixed with a large amount of noise, and follow-up magnetic field and current analysis is seriously affected is solved.

The invention relates to the technical field of battery simulation, in particular to a temperature adjustment method and system for simulating a battery based on a battery simulator. The method comprises the following steps: collecting the material thermal conductivity, thickness and layer number information of the battery cell lamination structure, and recording the information as battery cell lamination structure data; performing thermal resistance calculation on each layer of the battery cell according to the battery cell lamination structure data to obtain thermal resistance distribution data of each layer of the battery cell; performing space-time inversion simulation on the heat accumulation condition in the battery cell in the rapid charging process to obtain battery cell heat accumulation simulation data; and determining current density distribution data in the battery cell in the rapid charging process according to the thermal resistance distribution data of each layer of the battery cell and the battery cell heat accumulation simulation data. Through data monitoring technology data and data simulation technology, thermal resistance distribution calculation of heat accumulation in the battery cell is realized, accurate simulation of a heat accumulation path is realized, cooling efficiency is improved, and battery safety is enhanced.

The invention discloses an antenna performance analysis method and device for a mobile terminal, and relates to the technical field of communication, and the method comprises the steps: obtaining different antenna digital models and the working frequency corresponding to each antenna digital model; placing each antenna digital model at different positions of the mobile terminal shell model to obtain a plurality of mobile terminal models of each antenna digital model; according to various mobile terminal position association information, the mobile terminal model is combined with the head model and the hand model, and different simulation scenes are constructed; determining information such as current density distribution of the mobile terminal model in a free space, OTA performance and electromagnetic radiation in different simulation scenes by using an electromagnetic simulation algorithm; training the neural network model by using the simulation result to obtain an antenna performance analysis model; and performing antenna performance analysis by using the antenna performance analysis model. The antenna performance analysis cost of the mobile terminal can be reduced, and the analysis efficiency and the accuracy of the analysis result can be improved.

The invention discloses an electrophysiological signal fusion method and device, relates to the technical field of biomedicine, and mainly aims to solve the problem of low cardiac imaging evaluation accuracy caused by poor effectiveness of existing electrophysiological signal fusion. The method includes the steps that electrophysiological signals obtained after cardiac organs are collected and subjected to active magnetic field compensation and passive magnetic field compensation are obtained, and active magnetic field compensation signals of active magnetic field compensation are completed by controlling a main control magnetic field source based on a deep neural network model; a passive magnetic field compensation signal of the passive magnetic field compensation is completed based on residual magnetic field data modeling; screening effective signals from the electrophysiological signals, and performing inversion reconstruction on the effective signals to obtain current density distribution; cross-modal fusion is conducted on the electrophysiological signals, the current density distribution and the electrocardiosignals through a deep learning model after model training is completed, a signal fusion result is obtained, and the deep learning model is trained based on Maxwell constraints.

The embodiment of the invention provides a current magnetic source inversion positioning method and device based on a unidirectional magnetic field gradient, and the method comprises the steps: determining a fluxgate probe, and determining an auxiliary testing tool based on the fluxgate probe; wherein the auxiliary test tool comprises a two-dimensional grid; acquiring magnetic field data through a fluxgate probe based on the two-dimensional grid; determining magnetic field gradient data based on the magnetic field data, and determining a current density distribution based on the magnetic field gradient data; and determining current magnetic source position information based on the current density distribution. The method comprises the following steps: acquiring magnetic field data through a fluxgate probe based on a two-dimensional grid; determining magnetic field gradient data based on the magnetic field data, and determining a current density distribution based on the magnetic field gradient data; the current magnetic source position information is determined based on the current density distribution, and the diagnosis of the current state in the equipment and the judgment of the abnormal current value can be realized.

The invention relates to the technical field of semiconductor device design and simulation, in particular to a multi-physics-field coupled photoelectric detector modeling method and system, and the method comprises the steps: calculating the spatial distribution of the carrier generation rate, the carrier recombination rate, the potential, the distribution of electron concentration and hole concentration, and heat effect feedback data of a surface incidence semiconductor photoelectric detector; calculating the current density distribution of the target surface incident semiconductor photoelectric detector under the dynamic input optical power; based on an automatic differential Newton iteration method, a multi-physics field coupling equation set is solved according to spatial distribution of a carrier generation rate, current density distribution, a carrier recombination rate, potential, distribution of electron concentration and hole concentration and heat effect feedback data; and establishing an equivalent circuit model of the surface incidence semiconductor photoelectric detector, and carrying out co-simulation with an external circuit. Therefore, the problems of insufficient physical field coupling, poor numerical stability, low calculation efficiency, inaccurate simulation and the like in a traditional photoelectric detector simulation method are solved.

The invention discloses a nanosecond pulse hollow cathode electron beam current evaluation system, which aims at the problem of limited capacity of a current satellite communication channel, researches a nanosecond pulse high-current electron beam for driving a terahertz radiation source, and measures electron beam current and energy density distribution. The device is fixed on a four-axis motion platform through a Faraday cup with a slit hole, and the four-axis platform comprises an x axis, a y axis, a z axis and an R axis. Under the driving of the four-axis platform, the nanosecond time response Faraday cup can rotate around the z axis and sweep the section of the electron beam at a certain rotation angle in the direction perpendicular to the slit, and accordingly parallel projections of the electron beam at different angles are obtained. And current density distribution of a certain section of the electron beam is obtained through a filtering back projection algorithm program of the computer. On the basis, the three-dimensional density distribution of different energy electrons is obtained by changing the axial distance and the electron energy screening voltage, and then the time-space domain distribution of the electron beam energy density is obtained.

The invention relates to the technical field of thermoelectric material surface treatment, and provides a bismuth telluride-based thermoelectric material wafer surface treatment method which comprises the following steps: acquiring multi-dimensional data such as current density distribution, temperature field distribution, solution concentration gradient and plating thickness increment in real time through a sensor array; performing iterative calculation on the data based on a thermoelectric performance parameter optimization model to generate an optimal parameter combination of chemical oil removal, activation, nickel plating and tin and bismuth plating processes; dynamically adjusting the anode plate area ratio, the current density threshold value and the solution temperature fluctuation range of the electroplating equipment; a self-adaptive feedback mechanism is used for correcting parameter deviation, so that a uniform thermoelectric function layer structure is formed on the surface of the wafer. According to the method, the uniformity and the thermoelectric performance stability of the surface coating of the bismuth telluride thermoelectric wafer can be improved, the defect rate is reduced, and the production efficiency and the product consistency are improved.

The invention relates to the technical field of bridge health monitoring, in particular to a bridge support corrosion current field imaging monitoring method and system, and the method comprises the steps: presetting a matrix type electrochemical sensor on a support steel plate, and collecting the inductance data of a collector at a sampling frequency of 0.1-0.5 Hz; ohmic resistance drift caused by temperature is eliminated through adaptive quantum Kalman filtering, and a resistance-current density distribution diagram is constructed; constructing a current density distribution diagram of the cross section of the support by adopting a back propagation electrical impedance tomography technology; when the corrosion rate exceeds 0.15 mm / year, an early warning system is triggered, the bearing capacity attenuation rate of the support is calculated, and the support is guided to be replaced; a topological separation technology of a multi-dimensional state space and quantum heuristic adaptive parameter optimization effectively eliminate temperature interference; through current field topology reconstruction and multi-source data fusion, the imaging precision is improved; the quantitative relation between the corrosion rate and bearing capacity attenuation of the support is established, and a scientific basis is provided for bridge maintenance.

The invention relates to the technical field of medical rehabilitation equipment, in particular to pelvic floor muscle group electrical stimulation equipment with a customizable appearance and a customizing method thereof.The pelvic floor muscle group electrical stimulation equipment comprises a treatment probe with the customizable appearance, and the treatment probe comprises a center shaft, a balloon body wrapping the center shaft and at least one flexible tensioning belt; one end of the flexible tensioning belt is anchored to the inner wall of the balloon body, the other end of the flexible tensioning belt penetrates through the outer wall of the center shaft to be connected with a locking ring arranged in the center shaft, the length of the flexible tensioning belt is determined by the rotating angle of the locking ring, and the locking ring can rotate when heated and cannot rotate after being cooled. According to the embodiment of the invention, the shape of the treatment probe can permanently reproduce the physiological contour of a user through one-time shaping and curing, so that the adaptation problem of a standardized probe is fundamentally solved, the wearing comfort and stability are greatly improved, the close and uniform contact between an electrode and pelvic floor muscle tissue is ensured, and the treatment effect is improved. And the current density distribution is uniform.

The invention belongs to the field of bipolar plates, and particularly discloses a high-temperature solid oxide electrolytic cell bipolar plate based on an X-type cross flow field, which comprises a cathode plate body and an anode plate body, the cathode plate body comprises a cathode flow field plate used as a core support structure of the cathode plate body; the X-shaped cross runner flow field is arranged on the outer side of the cathode flow field plate; the X-shaped cross flow channel flow field comprises an X-shaped cross flow channel and a plurality of parallel first straight flow channels, and the X-shaped cross flow channel is arranged among the first straight flow channels and used for communicating the first straight flow channels; the cathode gas inlet is arranged at the inlet end of the cathode flow field plate; and the cathode gas outlet is arranged at the outlet end of the cathode flow field plate. Through the structural design of the X-shaped cross flow channel flow field, the gas and current density distribution uniformity is improved, the voltage drop and the power consumption are reduced, the generation of local hot spots and thermal stress is inhibited, the thermal management and operation performance of the electrolytic cell is remarkably improved, and the service life of the electrolytic cell is prolonged.

According to the parking battery energy distribution optimization method and system, the initial flowing direction of battery electrolyte is calculated by monitoring the three-axis acceleration and angular speed of a vehicle in real time, and electrolyte concentration gradient distribution is simulated and predicted in combination with fluid mechanics. And when the concentration gradient exceeds a threshold value, dynamically dividing an electrode area and optimizing an activation proportion, synchronously calculating current density distribution and an electrochemical reaction rate, and deducing the real-time output power of the battery by using an equivalent circuit model. By comparing real-time power requirements of electric equipment, a pulse width modulation technology is adopted to generate an initial energy distribution scheme, switching frequency distribution of an electrode activation area is finely adjusted based on current density requirements, and finally dynamic regulation and control of the battery management system on electric energy output are achieved. According to the method, the problem of output power fluctuation caused by non-uniform electrolyte distribution due to vehicle shaking in a parking state is effectively solved, and the energy distribution efficiency and the power supply stability of the battery with the special-shaped structure under a complex working condition are greatly improved.

The invention discloses an improved interdigital jet flow field device and a proton exchange membrane water electrolysis hydrogen production device thereof, and aims to solve the problems of non-uniform reactant distribution, gas retention, local hot spots and the like of a traditional flow field. The traditional flow field design, such as a parallel flow channel and a snakelike flow channel, generally has certain limitations in the aspects of fluid flow resistance, mass transfer efficiency, thermal management uniformity and the like, and is difficult to meet the requirements of a high-performance water electrolysis device; through an optimized geometric structure and a gas emission strategy, uniform distribution of reactants is promoted, and gas stagnation areas and local high hot spots are reduced, so that more efficient current density distribution uniformity and heat production management uniformity are realized. The flow field adopts a staggered jet flow channel structure, and is combined with an optimally designed under-rib opening channel, so that the vertical flow velocity is increased, the pressure drop is reduced, and the gas-liquid interface reaction efficiency is improved.

The invention discloses a preparation method and application of a composite 3D negative electrode current collector for a lithium metal battery, and belongs to the field of batteries, and the preparation method comprises the following steps: firstly, introducing a reduced graphene oxide artificial interface layer on the surface of the current collector through a chemical coating means, so that the reduced graphene oxide artificial interface layer and the current collector are tightly combined and are not easy to fall off after being bent due to chemical reaction in the process; and the conductivity and the ductility of the coated current collector are not greatly damaged. Then, on this basis, a three-dimensional micro-pit array structure with a lithium-loving oxide layer is introduced on the surface of the current collector by means of laser etching, so that the specific surface area of the current collector is increased, the surface current density distribution is adjusted, lithium metal is effectively induced to be uniformly deposited on the macro-scale and the micro-scale, and formation of lithium dendrites is inhibited; the lithium copper half battery assembled by the current collector has excellent cycle performance. The preparation process flow is simple, the composite 3D current collector with excellent performance is prepared, the cost is effectively reduced, and the production efficiency is improved.

The invention provides a pole group assembly and a lead-acid battery, and relates to the technical field of lead-acid batteries. The plate group assembly comprises a grid, a first busbar, a second busbar and a shell structure, tabs are fixed at the tops and the bottoms of the grids, the tabs at the tops of the grids are electrically connected through a first busbar, and the tabs at the bottoms of the grids are electrically connected through a second busbar; the plurality of grids are all mounted in the shell structure, mounting holes are formed in the side wall of the shell structure, the mounting holes extend to the bottom from the top of the shell structure, conductive parts are arranged in the mounting holes, and the first busbar and the second busbar are electrically connected through the conductive parts. According to the plate group assembly, the tabs are arranged at the top and the bottom of the grid, and the first busbar and the second busbar are electrically connected through the conductive piece, so that the potential difference between the top and the bottom of the grid can be reduced, the utilization rate of active substances in the middle and the bottom of the grid is improved, and the current density distribution on the grid is more uniform; and the cycle life of the battery is prolonged.

The invention discloses an anode with a three-dimensional structure and a manufacturing method and application thereof, and belongs to the technical field of electroplating. The anode with the three-dimensional structure comprises an anode rod, an anode active part and a connecting rod, wherein the anode active part has a wave structure, and an included angle between the extension direction of the wave and the anode rod is less than or equal to 10 degrees; the wave structure comprises a straight part and a wave part which are connected; the wave part is in the shape of at least one of a quadrangle, a triangle, an arc and an irregular waveform; the connecting rod connects the anode rod and the anode active component. The anode provided by the invention can provide complex current density distribution, has the advantages of current density compensation for thick plate electroplating, especially BGA dense holes, and can well improve the TP value of the dense holes, so that the electroplating uniformity is improved, specifically, the copper thickness range on the surface of a PCB is reduced, and the electroplating efficiency is improved. The invention also provides a preparation method and application of the anode.

According to the method for locally plating the chromium on the metal surface of the part, the metal surface of the part comprises a surface B needing to be plated with the chromium and a surface A which is adjacent to the surface B and does not need to be plated with the chromium, and a groove is formed between the surface B and the surface A to separate the surface B and the surface A; before electroplating, a non-ferrous metal sheet is tightly bonded to the A face through insulation paste so that the A face can be shielded by the non-ferrous metal sheet, and insulation protection is conducted on the other non-plated faces needing to be protected through insulation protection materials; and the surface B is soaked in electroplating liquid, and electroplating treatment is conducted after electrification. According to the method, non-plating surface protection is achieved, the current density distribution condition of the chromium plating surface is improved, the obtained chromium plating surface is smooth and fine, and the edge is free of the wavy defect; compared with a traditional insulating material, the tool clamp is low in cost, easy and convenient to operate and high in manufacturing qualification rate.