478 results about "Current density" patented technology

The invention provides a double-pulse high-frequency switching power supply control method and system for precise electroplating, and relates to the field of electroplating, and the method comprises the steps: collecting area surface data through a three-dimensional scanner, and obtaining a three-dimensional model; extracting a high-curvature area grid according to the three-dimensional model, and calculating to obtain a surface concave-convex degree index; performing current field simulation, and calculating current density vector distribution; when the deviation of the current density vector distribution exceeds a preset deviation threshold value, pulse parameters are optimized through a genetic algorithm; selecting a pulse parameter which is most matched with the surface concave-convex degree index, and carrying out iterative calculation to obtain updated current density vector distribution; based on the difference between the updated current density vector distribution and the initial distribution, predicting a coating thickness value, and determining a preliminary evaluation index; and optimizing pulse parameters to obtain a final control scheme of uniform current distribution. According to the method, pulse parameters can be dynamically optimized according to the geometrical shape of the workpiece, and uniform current distribution and stable plating quality are realized.

The invention belongs to the crossing field of artificial intelligence and process control, particularly relates to an intelligent coupling control strategy for chlorine production through seawater electrolysis based on digital twinning, and aims to solve the problems of response lag, weak disturbance suppression and lack of electrode aging early warning in a traditional control method. According to the strategy, a high-fidelity digital twin fusing electrochemistry, fluid and thermodynamics is constructed, characteristics of current, temperature, impedance spectroscopy and the like are collected and fused at high frequency through a multi-source sensor, a state space model driven by a deep recurrent neural network is established, and current efficiency and electrode aging coupling evolution recognition is achieved; when salinization or flow mutation is detected, the twinborn body predicts and dynamically calibrates the current density and the voltage set value in advance, and the safety process window is synchronously scaled. According to the strategy, the chlorine gas yield fluctuation is reduced by 60%, the energy consumption standard deviation is reduced by 45%, the fault early warning is advanced by 2-5 hours, the fault-free operation time of the system is prolonged by 50%, and high-precision, self-adaptive and preventive intelligent control of the electrolysis process is realized.

The invention discloses an electrochemical descaling process ion concentration dynamic balance control method and system, and relates to the field of water treatment of a circulating cooling water system.The method comprises the steps that a multi-parameter sensor is deployed to collect calcium and magnesium ion concentration, pH, conductivity, flow and other multi-dimensional data in real time, and an electrochemical deposition dynamic model is combined; dynamically evaluating the time sequence change trend of the ion concentration; according to the method, an ion concentration dynamic balance control algorithm is constructed, and the current density adjusting quantity is calculated by synthesizing ion concentration deviation and historical integral deviation, so that the target current density of the electrochemical reactor is adaptively adjusted, and the system is always maintained in a target concentration interval under different inlet water quality and load conditions; precise electrolysis control is achieved by periodically adjusting power output, and the descaling efficiency and energy consumption are effectively balanced. Therefore, the self-adaptive adjustment of the electrochemical descaling process is realized, and the stability and the self-adaptability of the descaling process are remarkably improved.

The invention discloses a lightning arrester resistor disc nonlinear conductivity fitting method and system based on a temperature correction coefficient, a medium and equipment, and the method comprises the steps: calculating a current-voltage relation of a lightning arrester according to the volt-ampere characteristic of the lightning arrester and the actual size and material parameters of each component in the lightning arrester, and converting the current-voltage relation into a current density-electric field intensity relation; processing the volt-ampere characteristic interpolation curve in a segmented manner by adopting a logarithm domain processing method and fitting the volt-ampere characteristic interpolation curve; calculating a nonlinear conductivity temperature correction coefficient according to the direct-current reference voltage of the resistor disc of the lightning arrester at different temperatures; calibrating the reference point of the temperature correction coefficient to obtain an equivalent nonlinear conductivity curved surface based on the temperature correction coefficient; performing goodness-of-fit calculation on the obtained equivalent nonlinear conductivity curved surface, and if the goodness-of-fit is relatively high, outputting the equivalent nonlinear conductivity; and if the goodness of fit is relatively low, performing segmentation fitting on the volt-ampere characteristic curve again until the goodness of fit of the equivalent nonlinear conductivity curved surface is relatively high.

The invention relates to the technical field of electrochemical water treatment, and discloses a high-salt waste liquid electric flocculation hardness removal and electrodialysis resourceful treatment method and a high-salt waste liquid electric flocculation hardness removal and electrodialysis resourceful treatment system. The method comprises the following steps: collecting water quality parameters of the high-salt waste liquid and initial electrochemical impedance spectroscopy parameters of a polar plate; calculating the initial current density according to the hardness and the conductivity, carrying out electric flocculation treatment, monitoring impedance spectrum change in real time, identifying the scaling type, and predicting the residual operation time of the polar plate; the current density is optimized according to the prediction time, and the residual hardness is calculated; and adjusting electrodialysis parameters by taking the residual hardness as a feedforward signal for concentration, and performing bipolar membrane electrodialysis on the concentrated solution to obtain acid-alkali liquor. The problems that in the electrochemical treatment process of the high-salt waste liquid, the state of a polar plate cannot be monitored in real time, consequently, operation parameters are adjusted blindly, and energy consumption is high and the recycling efficiency is low due to the fact that parameters of a pretreatment unit and parameters of a pretreatment unit are not linked are solved.

The invention relates to a nickel-molybdenum anode electrode based on a crack induced self-passivation mechanism and a preparation method of the nickel-molybdenum anode electrode. The method comprises the following steps that 1, a substrate is soaked in a solution A for 1-25 min and then taken out; 2, immersing the substrate treated in the step 1 into a solution B for 10 minutes to obtain a precursor; and 3, putting the precursor into a Joule ultrafast heating device, heating the precursor to 380-450 DEG C at a heating rate greater than or equal to 100 DEG C / min in an air or inert atmosphere, carrying out heat preservation for a certain time, and cooling to obtain the nickel-molybdenum anode electrode. According to the method, the foam nickel three-dimensional framework is free of structural damage through short-time chemical soaking, the original high porosity and interconnection network of the foam nickel three-dimensional framework are perfectly reserved, and the loss rate of the specific surface area is reduced. According to the prepared nickel-molybdenum anode electrode, by means of the self-passivation effect of the crack edge and the component storage function of the thick layer, the Mo dissolution rate is reduced by one order of magnitude, and thousand-hour-level stable operation under the low current density can be achieved.

The invention specifically discloses an all-vanadium redox flow battery multi-target operation optimization control method based on a particle swarm algorithm, and relates to the technical field of all-vanadium redox flow battery energy storage system control. The method comprises the following steps: firstly, collecting and preprocessing real-time operation data of a VRB system; constructing a multi-objective optimization function including charging time, input / output energy and pump energy consumption in a charging and discharging mode; taking the charge-discharge current density and the electrolyte flow as decision variables, taking the temperature, the voltage and the SOC value as constraint conditions, and carrying out optimization solving through a particle swarm optimization algorithm to obtain optimal parameters; and finally, realizing full-process automatic closed-loop control by combining data acquisition, function calculation, parameter adjustment and simulation feedback. According to the method, through multi-target dynamic optimization, decision variable and constraint condition and closed-loop adaptive control, collaborative optimization of shortening the charging time of the all-vanadium redox flow battery, improving the system efficiency and reducing the pump energy consumption is realized, and the operation safety, stability and complex scene adaptability of the system are enhanced.

The invention discloses a device and a method for a circulating cooling water system, an electrophoresis device comprises an electrophoresis tank, a reaction tank and a sedimentation tank which are communicated in sequence, a cathode material is arranged in the electrophoresis tank, an electrophoresis anode tube group is inserted on the cathode material, the electrophoresis anode tube group is composed of a plurality of electrophoresis anode tubes which are arranged in parallel, and the electrophoresis anode tubes are arranged in the sedimentation tank. The electrophoresis anode tube is provided with an anode element, water inlet pipes, an anode tab and a water outlet pipe, the anode element is coated with an electrophoresis film, the top of the anode element is provided with a connecting pipe fitting, the water inlet pipes, the anode tab and the water outlet pipe penetrate through the connecting pipe fitting, and each water inlet pipe is communicated with a bypass water outlet of the circulating cooling water system; each water outlet pipe is communicated with a first water return port of the circulating cooling water system, a water inlet of the electrophoresis tank is communicated with the bypass water outlet, and a water outlet of the sedimentation tank is communicated with a second water return port. The electrophoresis method is implemented by adopting the electrophoresis device. According to the electrophoresis device and the electrophoresis method, the current density and the current efficiency can be improved, and descaling of medium and large circulating water systems is met.

The invention relates to the technical field of TGV packaging, in particular to an electroplating system for a TGV and panel-level packaging process. Comprising a tank body and environment maintenance module, a soluble anode and current redistribution module, a cathode clamp and substrate posture regulation and control module, a micro-area jet flow coupling array module, a pulsed electric field and impedance compensation module and an electroplating liquid peripheral circulation and online regeneration module, the thickness uniformity of a plating layer on a panel-level large-size substrate is remarkably improved through real-time closed-loop coupling of micro-area jet flow and current density and accurate correction of an adjustable shielding grid on edge current, the thickness uniformity of the plating layer on the panel-level large-size substrate is improved, and the thickness uniformity of the plating layer on the panel-level large-size substrate is improved. According to the method, the through hole filling void rate is reduced to an extremely low level, and bubble desorption, crystal nucleus homogenization and updating of an interface solution are effectively promoted by utilizing micro-vibration, dynamic variable immersion and periodic shaking functions of the cathode clamp, so that thickening of a diffusion layer is inhibited, and the defects of through hole filling void and the like are reduced.

The invention relates to the technical field of electroplating process control, and discloses a vertical electroplating feeding control method and system.The method comprises the steps that anode current distribution and electrolyte parameters are monitored in real time, and the feeding rate matching degree is judged; the plating thickness uniformity risk level is evaluated based on a fuzzy control model, and the cumulative effect intensity of temperature fluctuation on anode passivation is quantified through multivariable regression analysis and a dynamic feedback mechanism; judging whether to trigger multi-stage feeding strategy recombination according to the risk level and the cumulative effect intensity; the current density and the electrolyte flow velocity are decoupled, a material consumption compensation coefficient is calculated, an adjustment instruction is generated, and iterative optimization can be carried out according to the execution effect. The system comprises a state monitoring module, a risk assessment module, an effect analysis module, a strategy decision module, a parameter decoupling module and a compensation execution module. According to the invention, the feeding control precision and the process stability are improved, and the method is suitable for precise control of the vertical electroplating process.

The invention discloses an electroplating method of a circuit board positive piece process based on vertical copper deposition, which comprises the following steps: cutting and baking a board at the temperature of 165 + / -5 DEG C for 3-5 hours; drilling and polish-brushing are conducted, and the polish-brushing linear speed is 4.0 m / min; the backlight grade of the circuit board after copper deposition is greater than or equal to 9 grade; performing line pretreatment, wherein the line speed is 4.5 m / min; pressing a film; exposure is conducted, the exposure energy is 3400-3600 MJ, the exposure time is 3-4 s, and standing is conducted for 30 min or above after exposure; developing, wherein the temperature of developing tank liquid is 28-32 DEG C, and the production line speed is 5-5.5 m / min; pattern electroplating is conducted, the current density is 13 ASF, the electroplating time is 40-50 min, hole copper is larger than or equal to 20 microns, and surface copper is larger than or equal to 33 microns; etching is carried out, the film stripping line speed is 4.7 m / min, and the etching line speed is 8.0 m / min; and AOI. According to the electroplating method of the circuit board positive film process based on the vertical copper deposition, the vertical copper deposition process is adopted, and the production efficiency and the product yield are improved.

The invention belongs to the technical field of PCB detection, and particularly discloses a PCB copper thickness and line width uniformity detection method and system, and the method comprises the steps: dividing a PCB surface into a plurality of detection regions, carrying out the detection of the copper thickness uniformity and the line width uniformity in each detection region, constructing a uniformity evaluation mechanism of dual dimensions of space correlation and time continuity, and carrying out the detection of the copper thickness uniformity and the line width uniformity. Dynamic uniformity judgment of each detection area in the electroplating process is realized, early abnormity can be effectively identified, and meanwhile, after copper thickness and line width uniformity judgment is completed and an abnormal detection area is identified, current density of the abnormal area is dynamically associated with copper thickness fluctuation characteristics; and lagging correlation analysis is carried out on the plating solution flow rate and the line width fluctuation characteristics, so that main influence factors causing nonuniformity are determined, closed-loop analysis from anomaly detection to root cause tracing is realized, and clear directional guidance is provided for process parameter tuning.

The invention discloses a micro-grid hydrogen power supply power accurate adjustment and overshoot suppression method, which comprises the following steps: acquiring sound waves generated in an electrochemical process in a proton exchange membrane in a hydrogen power supply to obtain an acoustic response signal set; based on the acoustic response signal set, reconstructing the current density in the proton exchange membrane to obtain a spatial distribution diagram with high temporal-spatial resolution; generating a directional acoustic compensation signal according to the non-uniformity represented by the spatial distribution diagram, and applying the directional acoustic compensation signal to a target area of the proton exchange membrane; and synthesizing the data, and generating a final control instruction for adjusting the hydrogen power supply through a multi-time scale coordination control architecture. According to the invention, real-time perspective and targeted physical intervention of the internal state of the fuel cell are realized through a non-intrusive acoustic means, and the dynamic response speed, the power regulation precision and the operation stability of the hydrogen power supply are remarkably improved.

The invention provides an electrical equipment overheating hidden danger early warning method and system based on unmanned aerial vehicle multi-spectral imaging, and belongs to the technical field of power equipment state monitoring, and the method comprises the steps: firstly obtaining ultraviolet photons and spatial point cloud data collected by an unmanned aerial vehicle; a three-dimensional model is constructed based on the point cloud, and electric field distribution information is obtained through finite element analysis. And the photon data and the electric field information are combined, and the discharge charge quantity and distribution are obtained through space inversion correction. And calculating the discharge current density by using an energy dissipation model, and determining the discharge thermal power loss density in combination with the local electric field. And finally, a steady-state heat conduction equation is solved based on the heat conduction and dissipation parameters, temperature field distribution under heat balance is calculated, and early warning information is generated when the steady-state temperature exceeds a heat-resistant threshold value. According to the invention, early-stage accurate prediction and positioning of the hidden overheating fault of the electrical equipment caused by insulation degradation are realized.

The invention relates to the technical field of life prediction, in particular to a high-voltage switch cabinet contact life management system based on digital twinning, which comprises a thermal behavior acquisition module, a conductive state construction module, a thermal loss dynamic evaluation module, a thermal disturbance response regulation and control module and a life mapping driving module. According to the method, temperature difference and time interval in an on-off period are collected, thermal stress change is calculated in combination with current density, thermal characteristics of materials are correlated, thermal behaviors of a contact are dynamically reflected, a conductive path boundary is reconstructed based on contact area and pressure offset, a through-flow state is accurately described, and heat accumulation and arc energy input are extracted. The method comprises the steps of analyzing a temperature trend under thermal diffusion lag, constructing a heat loss evolution curve, adjusting thermal conductivity distribution through a ratio of temperature rise to mass migration rate, improving local adaptability of thermal disturbance response, generating a life attenuation layer in combination with equivalent thermal mechanical load and fatigue tolerance, and enhancing dynamic nature and precision of evaluation. And accurate judgment and management of the degradation area are realized.

The invention discloses an FCE diode and a manufacturing method thereof. The cathode metal is provided with a trench isolation region, cathode N + regions and cathode P + regions, the cathode N + regions and the cathode P + regions are transversely and alternately arranged, the trench isolation region isolates the cathode N + regions from the cathode P + regions, and the thickness of the trench isolation region exceeds 2 microns of the cathode N + regions and the cathode P + regions And then a plasma storage region, a field stop region, a base region, an anode P region and anode metal are sequentially arranged. The thickened trench isolation region is indispensable for improving the current density uniformity near the cathode, and can weaken low-frequency oscillation and reduce conduction voltage drop; the thickened plasma storage region can weaken low-frequency oscillation, improve the current density uniformity near the anode and reduce reverse recovery energy under severe or extreme conditions; the two measures can also ensure that the base region is greatly thinned on the premise of enlarging the safe working region, so that the loss is reduced. By optimizing and compromising the structural parameters of each area, the FCE diode can achieve the beneficial effects of self-clamping, low loss, uniform current density, no high-frequency oscillation, slight low-frequency oscillation and wide safe working area.

The invention discloses a compact tensile sample dynamic hydrogen charging test device and a test method. The compact tensile sample dynamic hydrogen charging test device comprises an electrochemical hydrogen charging device, a liquid carrying table, a compact tensile sample and a clamp, a CT sample penetrates through the liquid carrying table through the clamp and is fixed, and the electrochemical hydrogen charging device is connected with the liquid carrying table; and the whole CT sample and the clamp head are positioned in the columnar container and are immersed in the electrolyte of the columnar container. The problems of potential safety hazards, limited hydrogen filling content and hydrogen escape during hydrogen filling of the CT sample are solved; electrochemical hydrogen charging can be carried out while a fracture toughness test or a fatigue test is carried out, so that hydrogen overflow caused from hydrogen pre-charging to an experiment is effectively avoided, and potential safety hazards of experiment problems caused by a conventional hydrogen pre-charging experiment are also avoided; any hydrogen charging current density can be taken, after the surface area of a sample is measured, the hydrogen flux in the experiment process can be strictly controlled by adjusting the current of the direct-current power supply, the gradient hydrogen concentration is obtained by controlling the current and the hydrogen charging time, research is facilitated, and experiment parameters are accurate.

The invention discloses a method and a system for regulating and controlling the proportion of synthesis gas of an SOEC electric pile. The method comprises the following steps: setting and initializing a target; the method comprises the following steps: acquiring an H2 / CO actual proportion Ractual and multi-source operation parameters of a stack outlet in real time, calculating a proportion deviation delta R = Ractual-Rtarget, and executing hierarchical regulation and control; all regulation and control actions need to follow a preset heat-electricity-gas coupling safety boundary. According to the technical scheme, through an in-situ feedback-multi-parameter cooperative control mechanism, strong coupling limitation of temperature, current density and gas phase flow velocity is broken through, precise regulation and control of the H2 / CO proportion of the synthesis gas are achieved, and the strict proportion requirements of processes such as methanol synthesis and Fischer-Tropsch synthesis on raw material gas are met. According to the synthesis gas proportion regulation and control system of the SOEC electric pile, safety interlocking and trend pre-judgment can be carried out, and compared with traditional manual intervention, the fault recovery time is shorter.

The invention discloses a precise electrolytic machining cathode design method under multi-field coupling, which comprises the following steps of: discretizing a plurality of control lines in the section direction of a blade into a plurality of control points, determining the optimal feeding angle of a cathode based on the principle of minimizing the maximum theta angle of a blade profile, and generating an initial cathode section line in combination with a simplified electric field method and an equal bias method; then, establishing a blade simulation model with an electric field coupled with a deformation field, and determining a cathode correction amount according to a margin distribution condition after simulation to obtain a cathode cut-off line after correction iteration; and constructing a two-dimensional multi-physical field simulation model along the flow direction, analyzing the distribution rule of the current density, the bubble rate and the temperature in the machining gap to obtain the change condition of the gap along the way, and performing offset correction and fitting on the cathode section line after correction iteration to generate a final cathode profile. According to the method, the machining gap change is accurately predicted through multi-physics field co-simulation, the cathode design can be optimized, the profile precision is improved, and the design period is shortened.

The invention discloses an electrolytic stack performance evaluation method and equipment. The method comprises the following steps: acquiring an electrochemical impedance spectrum measured under a plurality of current densities in the operation process of the electrolysis galvanic pile; according to the relationship between the relaxation time distribution function and the impedance data of the electrochemical impedance spectrum, determining the characteristic frequency bands of a plurality of polarization processes in the electrolysis galvanic pile, and according to the characteristic frequency bands, determining the solution ion diffusion process, the cathode and anode charge transfer process and the substance transfer process in the electrolysis galvanic pile; and performing performance evaluation. According to the method, different electrochemical processes are quantified by identifying different frequencies by utilizing a relaxation time distribution method, so that the whole process of the electrolysis galvanic pile, such as internal resistance of each part, an ion transmission process, a cathode and anode reaction kinetic process, a bubble / electrolyte transmission process and other internal electrochemical characteristic indexes, is analyzed in detail; therefore, the performance evaluation and fault diagnosis of the electrolysis galvanic pile are improved.

The invention relates to the technical field of electroplating process intelligent monitoring, in particular to an electroplating process intelligent monitoring and executing system which comprises an electroplating bath. The sensing unit for monitoring is arranged in the electroplating bath, the sensing unit for monitoring comprises a probe group, an infrared thermal imaging module, a current density detector and a spectrum analyzer, and the probe group comprises a PH value detection probe, an ORP detection probe and a conductivity detection probe. The sensing unit for monitoring is used for collecting the PH value, ORP, conductivity, temperature field distribution, current density and metal ion concentration of the electroplating bath in real time; the calculation unit is in communication connection with the sensing unit for monitoring, and the calculation unit receives a signal of the sensing unit for monitoring and generates a control instruction; and the intelligent feedback unit is in communication connection with the calculation unit, and the intelligent feedback unit receives a signal of the calculation unit and executes the control instruction.

The invention discloses a method for simulating reverse current generation of an anion-exchange membrane water electrolyser and application of an accelerated stress test on the influence of the reverse current on an electrode, and relates to the technical field of electrochemistry. The method for generating the reverse current comprises the following steps: in a constant electrolysis state, 0V is applied at the moment of shutdown, the anode potential crosses the equilibrium potential, an instantaneous reverse polarization signal of-1.0 V vs. RHE appears, and then the instantaneous reverse polarization signal is quickly attenuated and approaches to zero, which indicates that the reverse current is successfully induced. The accelerated stress test method comprises the following steps of: respectively operating under different current densities, re-stopping and re-starting after operating under each current density, and repeating the operation. According to the method, real-time tracking and quantitative evaluation of the AEMWE anode failure process are achieved, the activity attenuation path and the inert covering layer forming process of the anode under the reverse current condition are defined, and reference is provided for reliability evaluation of the AEMWE electrode under the fluctuation working condition.

The invention relates to the technical field of fuel cell monitoring and life prediction, in particular to a fuel cell life prediction method combining mechanism and data driving, which comprises the following steps: calculating reversible potential of a fuel cell through a Nernst equation, and establishing a theoretical output voltage model by combining three voltage losses of activation, concentration difference and ohm; acquiring historical data of voltage attenuation under actual operation conditions, and determining a life end voltage threshold value; training historical data by using a time sequence algorithm, identifying an aging rule function of key parameters (ohmic impedance, hydrogen permeation current density, exchange current density and limiting current density), and evaluating parameter identification precision through RMSE; and substituting the parameter aging function into the voltage model to predict future voltage, and when a predicted value is lower than a life end threshold for the first time, calculating the remaining service life. According to the method, the electrochemical mechanism and the data driving technology are fused, and the prediction accuracy is remarkably improved.

The invention relates to the technical field of semiconductor packaging and micromachining, in particular to a defect-free electroplating filling method and system for a high-aspect-ratio glass through hole. The method comprises the following steps: preparing an ultrathin and compact copper seed composite layer with strong binding force on the inner wall of a glass through hole by adopting an atomic layer deposition (ALD) technology; preparing an electroplating solution containing a specific additive system; and implementing a segmented pulse electroplating strategy, and realizing defect-free copper filling from the bottom to the top of the through hole by regulating and controlling the current density, the pulse width and the intermittent time in stages and combining a reverse pulse technology. The system integrates ALD deposition, pulse electroplating and an electroplating liquid circulation system, and high precision and high yield in the filling process are ensured. The method effectively solves the problems of insufficient seed layer coverage, limited mass transfer, cavity / suture defects and the like in the filling of the glass through hole with the high depth-diameter ratio (greater than or equal to 20: 1), and is suitable for advanced packaging and manufacturing of large-size glass substrates (such as 510mm * 515mm).

The invention discloses a power transmission line ice resistance improving and transforming method based on four-split conductor transformation and double-split. The method comprises the steps that a line mechanical structure and electrical parameters needed in the power transmission line transforming process are collected; preliminarily selecting a modified double split conductor section according to an economic current density method; s2, verifying the selected wire cross section based on a heating condition, and if the heating verification is not passed, entering the step S2 again, and selecting a larger cross section; the diameter of the selected wire is verified based on the corona condition, and if the corona verification-free condition is not met, the corresponding corona inception field intensity Es is calculated to serve as the constraint condition in the step S5; based on mechanical and electrical safety constraint conditions, optimized design is carried out on the split spacing and the phase spacing of the remodeled wire; and S6, simulation verification of the ice resistance improvement effect after modification is carried out, and a new thought is provided for ultrahigh-voltage power transmission line wires in medium and heavy ice areas and structural form selection thereof through extraction of the lowest surface electric fields of different double-bundle conductor structural forms.

The invention provides a control method and system for a new energy battery. The method comprises the steps of obtaining real-time operation parameter data of a target battery, then determining a micro-short-circuit event according to a combined threshold value of a single voltage change value, an internal resistance change value and a local temperature change value in the real-time operation parameter data, and responding to the micro-short-circuit event, according to a chemical system, health parameters and a current environment working condition of the target battery, determining a micro-short-circuit state of the target battery. And determining a target current density and a target temperature window of the self-healing operation, so as to execute the self-healing operation in which the pulse current and the stable current are combined in stages in the target current density and the target temperature window, thereby effectively removing dendrites in the battery and recovering electrochemical balance. And the risk that micro short circuit is developed into hard short circuit or thermal runaway is reduced.

This invention discloses an IGBT parallel module having at least two IGBTs connected in parallel, each IGBT configured with a paired FRD; the two parallel IGBTs are designated as first and second IGBTs, and their corresponding paired FRDs are designated as first and second FRDs, respectively. A bridging FRD is also configured between the first and second FRDs; a portion of the anode pins of the bridging FRD is connected to the anode pins of the first FRD via bonding wires, and another portion of the anode pins of the bridging FRD is connected to the anode pins of the second FRD via bonding wires; when current imbalance occurs between the first and second FRDs, the bridging FRD reduces the rated current of the first and second FRDs and performs current buffering, thereby reducing the current density of each FRD; the pin connection structure of the anode of the bridging FRD makes the stray inductance of the bridging FRD greater than that of either the first or second FRD, thereby improving the softness of the reverse recovery of the first and second FRDs. This invention can prevent failure defects caused by current concentration.

The application discloses a kind of uniform electroplating equipment of precision hardware's use method, comprising the following steps: S1, workpiece placement: hardware with inner angle is clamped between positioning rod and anode, while ensuring the inner angle side of hardware towards anode, drive component tends to anode center movement, cathode is pushed by cylinder and is attached to hardware, and the midline of arc inner angle of hardware coincides with the vertical edge of anode;S2, discharge plating layer: current density is 10-15mA / cm 2 It is applied to workpiece, and plating duration is kept for 2-10s;S3, periodic discharge: cylinder is retracted to adhere to device away from cathode while drive component moves along track away from anode center, cathode also moves away from workpiece at this time, rotate gear at the speed of 40-50 degrees / s, drive cathode to rotate 119-121 degrees around anode center, repeat step S1 and step S2, and gear rotation is 3 times as a cycle;S4: repeat step S1-S3, and plating is completed after two cycles;In the application, by setting periodic plating device, the problem of uneven coating on workpiece surface caused by hydrogen evolution reaction is reduced.

The invention provides a stator, a motor, a pump body and a vehicle. Wherein the stator comprises a stator iron core, and the stator iron core comprises a yoke part which is of an annular structure; each tooth part comprises a tooth body and a tooth boot, and any two adjacent tooth parts and the yoke part enclose a stator slot; the inner circumferential wall of the yoke part between two adjacent tooth parts comprises two plane sections and a connection section, the connection section is connected between the two plane sections along the circumferential direction of the stator core, each plane section is connected with one tooth part, and the connection section comprises at least one of a cambered surface section and a folded surface section; the inner diameter of the stator core is recorded as D1, the number of the stator slots is recorded as Z, the circumferential width of the tooth body is recorded as t, and the radial width of the yoke part is recorded as h; wherein t is larger than or equal to h, and Z * t is smaller than pi * D1. According to the invention, the magnetic field distribution of the yoke part and the plurality of tooth parts can be adjusted, the reasonable slot space factor and current density of the motor are ensured, and the efficiency of the motor is improved.

The invention discloses a water management method of a coupling system based on a PEM water electrolysis module and an EHC module, and relates to the technical field of hydrogen energy. By controlling the optimal current density of the PEM electrolyzed water module, the content of water entering the EHC module is adjusted, so that the EHC module always operates in the optimal hydration state, and the overall efficiency of the system is improved. The method comprises the following steps: S1, establishing a relation model JPEM-r between the optimal current density of a PEM electrolyzed water module and the target pressure ratio of an EHC module; S2, obtaining the target pressure ratio of the EHC module; s3, according to the target pressure ratio of the EHC module, the optimal current density of the PEM electrolyzed water module is obtained through the JPEM-r relation model; and S4, adjusting the real-time current density of the PEM water electrolysis module to the target current density to realize water management of the EHC system. The invention further discloses a coupling system based on the PEM electrolyzed water module and the EHC module. The coupling system is used for improving the performance of the coupling system of the PEM electrolyzed water module and the EHC module.