3599 results about "Fast charging" patented technology

The invention relates to a power adapter charging protocol identification and compatibility self-learning optimization method. After the adapter establishes physical connection with a target terminal, a voltage signal output by the target terminal is collected, a handshake data sequence is formed, feature extraction is performed on the handshake data sequence, and a first protocol feature vector is generated. And performing similarity matching on the feature vectors in a protocol feature library to determine a historical protocol category and extract a corresponding historical charging parameter template. And during voltage and current step-by-step adjustment, collecting target terminal load impedance change data, extracting impedance spectrum features, and fusing the impedance spectrum features with the first protocol feature vector to form an enhanced protocol feature vector. And based on the enhancement protocol feature vector and the historical parameter template, predicting negotiation parameters supported by the target terminal, generating a predicted negotiation parameter set, and applying the predicted negotiation parameter set to a charging negotiation process, thereby realizing stable charging output with the target terminal. According to the method, the compatibility and the self-adaptive capability of the power adapter to various fast charging protocols can be improved.

The invention provides a lithium battery equalization thermal management method. Real-time temperature data is obtained by constructing a thermal distribution monitoring network, the temperature difference between a center and an edge area is analyzed, a thermal load distribution coefficient is calculated, and a dynamic heat dissipation intensity adjustment model is established; driving the multi-channel cooling system to operate according to the heat dissipation demand priority, and adjusting the flow distribution proportion of a cooling medium; a dynamic nonlinear feedback correction mechanism is adopted, secondary adjustment is carried out for uneven temperature distribution, and an optimal heat dissipation parameter combination is determined in combination with historical data. Uniformity control over temperature distribution of the battery module is achieved, the problem of heat accumulation in a center area is effectively solved, the heat dissipation efficiency under the rapid charging working condition is improved, and the safety performance and the service life of the battery module are guaranteed.

The invention relates to the technical field of lithium ion battery charging, and discloses a multi-device compatible intelligent fast-charging lithium ion battery system and a protocol matching method, the system comprises a charging device, the charging interface of which is used for being connected with a target device to charge a lithium ion battery pack of the target device; the battery management equipment acquires an initial communication signal of the connected target equipment in real time when the charging interface is connected with the target equipment, so as to extract a voltage fluctuation feature, a handshake time sequence feature and a protocol identification feature for generating an equipment feature vector; performing similarity matching on the equipment feature vector and the protocol feature parameter to obtain a candidate protocol set; according to the historical charging efficiency data of each candidate protocol in the candidate protocol set and the real-time load state of the target equipment, obtaining an optimal charging protocol and a corresponding charging curve template; and charging the lithium ion battery pack according to the optimal charging protocol and the charging curve template. And efficient, flexible and safe charging control can be realized.

The invention discloses a control system for lithium battery power management, and relates to the field of lithium battery control, and the system comprises a voltage input module which is used for externally connecting voltage and supplying power to a battery power supply module and a time delay module; the battery power supply module is used for charging the battery; receiving the battery voltage information, and adjusting the voltage output to the battery according to the battery voltage; the battery module is used for a battery to store electric energy; compared with the prior art, the system has the beneficial effects that the output voltage of the battery power supply module is adjusted through the feedback module, the output voltage of the battery power supply module is relatively large at the beginning, and the charging voltage is reduced along with the increase of the battery voltage, so that a quick charging effect is constructed; whether battery charging is abnormal or not is detected through the time delay module and the charging fault detection module, the battery power supply module is adjusted to perform constant-voltage charging when charging is abnormal, and the battery charging effect is guaranteed.

The invention relates to the technical field of current compensation, and discloses a current compensation strategy and a compensation system for improving the direct current fast charging rate of an electric automobile. According to the scheme, the total current of a high-voltage loop and the input current of a battery are detected in real time, the dynamic load current difference value is calculated, and the battery health state and historical charging data are combined; and the charging pile request current value is adaptively adjusted to counteract the shunting influence of the load power. Meanwhile, a closed-loop feedback regulation mechanism is adopted, a compensation coefficient is corrected in real time through a PID algorithm, and the stability of the charging current is ensured. When the power of the charging pile is limited, the system dynamically reduces unnecessary loads (such as an air conditioner and a heater) according to a preset priority request, and the charging power of the battery is guaranteed preferentially. The charging rate is improved (the charging time is shortened by 10%-15%), the adaptability of the system to dynamic load fluctuation is enhanced, and the service life of the battery is prolonged.

The invention discloses a new energy commercial vehicle fast charging working condition thermal management control method and system, and relates to the technical field of new energy vehicle thermal management and fast charging control, and the method comprises the following steps: collecting the temperature, voltage and current data of each subarea of a battery in a fast charging process, forming a time synchronization sequence, and based on the sequence, obtaining a new energy commercial vehicle fast charging condition; calculating internal thermal resistance and thermal capacity parameters of the battery in real time by using an online identification algorithm, updating a basic thermal model to obtain a corrected thermal dynamic model reflecting actual thermal characteristics of the current battery, importing the corrected model into a model prediction controller, constructing a multi-objective optimization function, and performing rolling solution in a prediction time domain to obtain a prediction model; and outputting an optimal target charging current instruction and a cooling total demand, adjusting the charging power according to the target current, and combining the temperature difference distribution of each partition. Accurate prediction and partition cooperative control of the thermal state of the battery in the fast charging process are achieved, the temperature rise and the temperature difference are effectively restrained while the charging efficiency is guaranteed, the service life of the battery is prolonged, and the system safety is improved.

The invention provides a lithium battery internal short circuit fault early warning and positioning method and system based on deep learning. The early warning and positioning method comprises the following steps: step S10, multi-dimensional data semantic acquisition and working condition self-adaptive preprocessing; step S20, collaborative extraction and alignment of cross-scale spatio-temporal features; step S30, performing dynamic threshold adaptive internal short circuit early warning and feedback optimization; s40, fault accurate positioning and verification of topology perception are carried out; and step S50, performing embedded collaborative optimization and self-diagnosis deployment. According to the invention, early weak signals of an internal short circuit fault can be found in time, and the efficiency and timeliness of battery safety monitoring are improved; the sensitivity of early warning is improved; the robustness in high-temperature, low-temperature and rapid charging and discharging environments is enhanced; and the positions of the single battery and the electrode with the fault can be accurately identified.

The invention discloses a power supply rapid charging pulse current regulation and control system and method based on current monitoring, and particularly relates to the technical field of power supply management. The method comprises the following steps: acquiring a pulse current signal in a battery charging process, performing nonlinear decoupling analysis, and decomposing the pulse current signal into a first characteristic sub-vector representing a real charging state of the battery and a second characteristic sub-vector representing a high-frequency harmonic interference state; predicting the change trend of the electrochemical impedance of the battery based on the first feature sub-vector to form an instant charging acceptance evaluation index, and evaluating the harmonic interference degree based on the second feature sub-vector to form a charging state misjudgment risk level index; based on the battery instant charging acceptance assessment index and the battery charging state misjudgment risk grade index, the optimal pulse current regulation and control strategy is determined, the power output parameters are adjusted in real time, the state misjudgment problem caused by high-frequency harmonic interference and electrochemical impedance coupling is effectively solved, and the battery charging performance and the long-term reliability are improved.

The present invention relates to the technical field of batteries, and provides a battery cover plate, a battery and a battery pack, the battery cover plate comprises: a cover plate body provided with a through hole; the sealing plate is arranged at the through hole, and the sealing plate is in sealing connection with the through hole; the boss is arranged on the outer side of the sealing plate in the first direction, the boss extends out of the through hole in the first direction, a plurality of convex ribs with closed outlines are integrally formed on the end face of the side, away from the cover plate body, of the boss, and the first direction is the thickness direction of the cover plate body; the surface area of the outer surface of the boss is increased through the existence of the convex ribs, meanwhile, the heat dissipation area of the battery cover plate is greatly increased, heat generated by a system can be rapidly conducted and dissipated in the charging and discharging process of the battery, the working temperature of the battery is effectively reduced, the battery can stably adapt to the high-rate rapid charging technical scheme, and in addition, the service life of the battery cover plate is prolonged. Through the design, the surface of the boss can be coated with the structural adhesive, and the bonding area of the structural adhesive and the boss is remarkably increased.

A direct current fast charging (DCFC) control system for a range extended electrified vehicle (REEV) includes a set of DCFC connectors electrically connecting a high voltage battery system of an electrified powertrain of the REEV to a charging port of the REEV and a control system configured to determine an ambient temperature external to the REEV, access a temperature model configured to model a temperature associated with the set of DCFC connectors, wherein the temperature model accounts for heat energy generated by an engine of the electrified powertrain, determine, using the temperature model, a modeled temperature associated with the set of DCFC connectors, and control, based on the ambient temperature and the modeled temperature associated with the set of DCFC connectors, a DCFC current provided by an external DCFC station to a high voltage battery system via a charging port and the set of DCFC connectors.

In one aspect, a computer-implemented method may include determining whether an anode potential offset of a battery pack has reached an upper threshold of a target range, responsive to determining that the anode potential offset of the battery pack has reached the upper threshold of the target range, receiving tear-down data associated with the battery pack, training, based on the tear-down data associated with the battery pack, cloud prediction models that are trained to predict a likelihood of occurrence of lithium plating associated with battery packs, and transmitting, to edge processors of fleet vehicles, parameters associated with the trained prediction models to cause the edge processors to train edge prediction models using the edge processors, wherein the edge processors modify a battery charging policy based on a prediction from the edge prediction models.

The invention relates to the technical field of charging management, in particular to a front-and-back stage cooperative control method and system for a direct-current fast charging module. Monitoring working parameters and environmental parameters of the front-stage converter and the rear-stage converter in real time, and constructing a multi-dimensional feature matrix in combination with a pre-acquired historical charging mode and user behavior data; performing multi-scale prediction on the charging energy demand by adopting the trained time sequence prediction model, and generating an energy demand curve comprising a short-term prediction window and a long-term prediction window; and dynamically adjusting modulation parameters of the front-stage converter according to the energy demand curve of the short-term prediction window, and adaptively switching a hybrid modulation mode of the rear-stage converter based on the energy demand curve of the long-term prediction window. According to the invention, working parameters and environmental parameters of the front-stage converter and the rear-stage converter can be monitored in real time, and comprehensive analysis is carried out in combination with a historical charging mode and user behavior data, so that more accurate and efficient charging control is realized.

The invention provides a liquid-cooling over-charging control method and device, electronic equipment and a storage medium, and belongs to the field of electric vehicle charging, the method comprises the steps that first target parameters of a liquid-cooling charging pile are acquired, and the first target parameters comprise working parameters of the liquid-cooling charging pile and power grid parameters of a power grid where the liquid-cooling charging pile is located; the first target parameter is compensated based on the environment temperature of the environment where the liquid cooling charging pile is located, and a second target parameter is obtained; and the liquid cooling charging pile is controlled to be in different working modes according to different conditions met by the second target parameter, and when the liquid cooling charging pile is in the different working modes, the liquid cooling parameters of the liquid cooling charging pile are different. According to the liquid cooling over-charging control method and device, the electronic equipment and the storage medium provided by the invention, the high-power charging efficiency and safety of the electric vehicle can be remarkably improved.

The invention provides a fast-charging charger service life prediction method based on deep learning, and the method comprises the steps: collecting electrical, thermodynamic and environmental parameters, carrying out the denoising through extended Kalman filtering, employing adaptive quantile normalization and time window weighted interpolation to process missing values, extracting the time sequence and thermodynamic characteristics in a sliding window, constructing a double-flow Transform-LSTM network, and carrying out the prediction of the service life of a fast-charging charger. The method comprises the following steps: respectively processing an electric current flow and a thermodynamic flow, introducing a stage perception attention mechanism, dynamically adjusting a feature weight, integrating double-current output through weighting, designing a physical loss function, finally outputting residual life, calculating a health state through weighting, triggering multi-stage early warning based on a threshold value, and classifying fault types in combination with Softmax. Abnormal data are selected through incremental training, the model is regularly and finely adjusted, physical constraint and deep learning are combined, charging stage characteristics are dynamically adapted, high-precision life prediction and fault diagnosis are achieved, and the method is suitable for real-time health management of fast charging equipment.

The invention discloses a sulfonate-based electrolyte and a preparation method and application thereof, and belongs to the technical field of electrolyte preparation, the electrolyte comprises a solute, a sulfonate-based compound and a cosolvent, the mass fraction of the solute is 1-90%, the mass fraction of the sulfonate-based compound is 0.1-99%, and the mass fraction of the cosolvent is 0-99%. According to the sulfonate-based electrolyte as well as the preparation method and the application thereof, the sulfonate-based solvent is used as a main solvent, a cosolvent, an additive and the like to develop a novel electrolyte, so that the balance between strong solvation and rapid charging capability of the electrolyte is promoted, and a high-voltage battery with high energy density is developed.

The invention relates to the technical field of vehicles, in particular to a battery charging method and device of a vehicle and the vehicle, and the method adopts a battery charging system which comprises first to eighth switches, and comprises the following steps: judging whether the vehicle is connected with a charging pile or not; if the vehicle is connected with the charging pile, acquiring a current charging mode of the battery charging system, and determining target states of first to eighth switches according to the current charging mode; and the first to eighth switches are controlled according to the target states of the first to eighth switches, and / or the multiple bridge arms are controlled based on a preset control strategy, so that the vehicle is subjected to direct fast charging or boost charging or current-rising charging. Therefore, the problem that the vehicle power battery cannot be charged or the charging efficiency is low when the charging pile is not matched with the battery voltage in the prior art is solved, and the charging experience of the vehicle power battery is improved.

The invention discloses a new energy automobile charging pile multi-dimensional data fusion monitoring and early warning method and system, and relates to the technical field of new energy automobile charging safety monitoring and control. The new energy vehicle charging pile multi-dimensional data fusion monitoring and early warning method comprises the following steps: S1, constructing a charging state original data set, and preprocessing the charging state original data set; s2, performing early warning grade division in combination with a disturbance trend analysis result and discriminator output; s3, a response control condition is matched according to the early warning level state; and S4, recording the operation structured data of the charging pile, constructing an event chain, and comparing the current and historical features to identify the coincidence degree. The problem that due to the complex operation working conditions of high-frequency plugging, large day and night temperature difference and heavy environmental dust of a new energy automobile charging pile in an urban fast charging station, an existing monitoring method cannot achieve multi-dimensional sensing and dynamic adjustment, and then abnormal early warning lags is caused is solved.

The invention discloses a low-cost charging pile topology for a fast charging-slow discharging scene of an electric vehicle and a modulation strategy of the low-cost charging pile topology. According to the low-cost charging pile topology, a group of half-bridge type shunt diodes are connected in parallel to each phase of main bridge arm of a traditional T-shaped three-level converter. In the discharging mode, the charging pile is consistent with a traditional T-type three-level operation state, and works in a slow-release scene with rated power and below. In the charging mode, the charging pile continuously shunts the main bridge arm power device by using the additionally arranged shunting diode, so that the current stress and thermal stress of the main bridge arm power device are reduced; and through a self-adaptive modulation strategy of three-level / two-level modulation mode switching, the loss distribution of a power device is optimized, the active power output capability of the charging pile in a charging mode is improved, the fast charging operation of the charging pile with over-rated power is realized, the equipment capacity utilization rate of the charging pile is fully excavated, and the method has remarkable engineering application value.

The utility model relates to the technical field of batteries, in particular to a battery cell cover plate and a battery cell. The battery cell cover plate comprises a cover plate main body provided with a mounting hole; the pole column comprises a material expanding part, a first column body part, a second column body part and a connecting part which are sequentially arranged in the axial direction, the first column body part is arranged in the mounting hole, and the size of the second column body part in the length direction of the cover plate is larger than that of the second column body part in the width direction of the cover plate; the shape of the cross section, perpendicular to the axial direction, of the second cylinder part is different from that of the cross section, perpendicular to the axial direction, of the expansion part, and the shape of the cross section, perpendicular to the axial direction, of the first cylinder part is the same as that of the cross section, perpendicular to the axial direction, of the expansion part; and the riveting piece is riveted with the pole. According to the utility model, the cross sectional area of the second column body part is increased, the overcurrent capacity of the pole is improved, the quick charging requirement of a battery cell is met, the temperature rise is prevented from being too high, the use safety of the battery cell is ensured, the material expansion part is not influenced by the second column body part with the increased cross sectional area, and the uniform material expansion of the pole and the riveting strength are ensured when the pole is riveted with a riveting piece.

A system detects degradation of battery health due to fast-charging and controls charging of the battery and / or provides indications of battery health while fast-charging. The system includes remove a battery charging circuit that controls a charging voltage waveform to supply charging current to a battery and a detection circuit that monitors a rate of change of the charging current and controls the charging voltage waveform responsive to an output of the detection circuit.

The invention relates to the technical field of community new energy control, and discloses an orderly and rapid charging new energy control method, which comprises the following steps: collecting photovoltaic output data, power grid voltage / current data, user charging behavior data and battery state parameters in real time; generating a dynamic charging strategy based on the power grid load data, the time-of-use electricity price information, the photovoltaic output fluctuation range and the battery health state evaluation result; generating a corresponding local optimization strategy based on the operation state data of each charging pile; an economic index and a technical index are calculated, and when any index exceeds a preset threshold value, a strategy adjustment instruction is triggered, and a charging mode switching threshold value is updated; an equipment health index is generated by combining inverter temperature, coil coupling efficiency and insulation impedance parameters with historical fault data, and maintenance early warning is triggered when the health index is lower than a safety threshold value. According to the invention, the electricity cost of the user can be reduced on the basis of improving the multi-energy collaborative optimization capability of the charging facility in the residential area.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises a shell assembly and an electrode assembly, and the shell assembly comprises a shell and a first electrode terminal arranged on the shell; the electrode assembly is accommodated in the shell and comprises a first pole piece and a second pole piece, each of the first pole piece and the second pole piece comprises a coating part and a tab, the coating part comprises an active material layer, the tab is not provided with the active material layer, one of the first pole piece and the second pole piece is a positive pole piece, and the other one is a negative pole piece; the active material layer in the positive pole piece comprises a positive active material, and the positive active material comprises lithium-containing phosphate with an olivine structure; the tab in the first pole piece is used for electrically connecting the first electrode terminal and the coating part in the first pole piece, and the area of the projection plane of the first electrode terminal along the thickness direction of the first electrode terminal is 300mm < 2 >-500mm < 2 >. According to the invention, the cycle performance and the use reliability of the battery monomer under a fast charge condition can be effectively improved.

The present invention discloses an in-road berth evidence-taking system for unmanned aerial vehicles and a method thereof, belonging to the technical field of parking charging. The system includes a plurality of berths arranged on the roadside; a lamp post is provided near the berth, and a flight evidence-taking device is further provided on the lamp post. The flight evidence-taking device includes an unmanned aerial vehicle and an apron. When a parked vehicle parks in the berth, the unmanned aerial vehicle approaches the parked vehicle and orbits around the parked vehicle as the center; the imaging module takes panoramic evidence-taking photos of the parked vehicle. The unmanned aerial vehicle is connected to a liftable and hidden male pole on the apron through a female pole for power taking, energy supply and data transmission, so as to realize rapid charging, effectively extend the endurance time of the unmanned aerial vehicle, and solve the problem of insufficient endurance. The unmanned aerial vehicle is equipped with an imaging module, which can orbit around and photograph the parked vehicle to obtain panoramic evidence-taking photos, associate the berth, the parked vehicle and the surrounding environment, and improve the accuracy and reliability of evidence-taking.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly and an electrolyte, the electrode assembly comprises a positive pole piece, the positive pole piece comprises a positive active material layer, and the positive active material layer comprises lithium-containing phosphate of an olivine structure; the electrolyte comprises, by mass, 8-30% of a carboxylic ester solvent, a lithium salt and an unsaturated ester additive, the lithium salt comprises lithium hexafluorophosphate and fluorine-containing lithium sulfimide, the mass content of the fluorine-containing lithium sulfimide in the lithium salt is 18-45%, the mass content of the unsaturated ester additive in the electrolyte is 0.05-5%, and the mass content of the unsaturated ester additive in the electrolyte is 0.05-5%. The unsaturated ester additive comprises one or more of vinylene carbonate, vinylethylene carbonate, allyl ethyl carbonate and a fluoro-carbonate additive; the amount of electrolyte in the battery cell is 2.8 g / Ah to 3.2 g / Ah. According to the invention, rapid charging and use reliability of the single battery can be considered.

The invention discloses an electrolyte, an electrochemical device comprising the electrolyte and a vehicle. The electrolyte comprises a solvent, a first additive and a second additive, the solvent comprises chain carboxylic ester, and the first additive comprises a sulfonate compound or / and a sulfate compound; the second additive comprises vinylene carbonate or / and fluoroethylene carbonate. According to the electrolyte disclosed by the invention, the chain carboxylic ester solvent, the first additive containing the sulfonate compound or / and the sulfate compound and the second additive containing the vinylene carbonate or / and the fluoroethylene carbonate are matched for use; the rapid charging capability and the high-temperature cycle performance of a lithium iron phosphate system battery with high safety performance can be improved, and the application of lithium iron phosphate in a power battery is further widened.

The invention relates to the technical field of big data analysis, and discloses a new energy automobile intelligent fast charging scheduling method based on multi-source data analysis, which comprises the following steps: S1, collecting multi-source charging scheduling data: constructing a charging scheduling multi-source data set; s2, multi-source data preprocessing and fusion: obtaining a charging scheduling fusion decision data set; s3, generating a charging scheduling decision: making the charging scheduling decision; s4, instruction issuing and execution control; s5, real-time monitoring and dynamic adjustment: dynamically adjusting a charging strategy; s6, feedback collection and optimization iteration are carried out; multi-source charging scheduling data are collected in real time through a vehicle-mounted terminal, a charging pile terminal, a power grid monitoring terminal and a traffic environment data terminal, a charging scheduling strategy is formulated through a cloud server, opinions are continuously fed back to a mobile phone user through a man-machine interaction terminal, charging scheduling feedback evaluation is carried out, model parameters are optimized, full-dimensional data driving is achieved, and the charging scheduling efficiency is improved. The charging efficiency is effectively improved, and the user experience is comprehensively optimized.

The application discloses a kind of fast charging method and device of lithium ion battery, it is related to power battery charge-discharge technical field.The application aims at the problem that the fast charging method of existing lithium battery cannot better adapt to the state of lithium battery in different charging stages.The SOC interval is selected in the application, and the SOC interval is divided into several charging stages with the defined ΔSOC as interval;The residual life prediction value of lithium ion battery is obtained according to the temperature, state of charge, charge rate and charge cycle number of lithium ion battery;The characteristic curve of lithium ion battery is obtained, and the charge time weight α of each charging stage is obtained according to the charge characteristic curve;The charging current of each charging stage is obtained by inputting the charging time, charge time weight and residual life prediction value into target equation.The application effectively prolongs the service life of battery while ensuring safe and fast charging.

The invention relates to the technical field of unmanned aerial vehicle charging and the technical field of energy storage, and discloses an unmanned aerial vehicle intelligent wireless quick charging platform based on echelon utilization batteries, which comprises a battery health assessment module, a battery management module and a battery management module, performing dynamic health assessment on each echelon battery in a charging and discharging state; the charging resource scheduling module obtains charging request information sent when the unmanned aerial vehicle prepares to return to the charging station, and dynamically allocates charging resources; the wireless charging control module is used for identifying the position information when the unmanned aerial vehicle lands, adjusting the wireless charging power and adaptively optimizing the working frequency; the energy optimization configuration module is used for performing energy optimization configuration; the safety protection module is used for identifying potential safety hazards and carrying out safety protection and fault self-healing; the optimization maintenance module is used for evaluating the performance of the charging platform and carrying out closed-loop optimization and decision updating; according to the invention, precise matching between the performance of the echelon battery and the charging demand of the unmanned aerial vehicle is realized.

The invention relates to the technical field of lithium battery capacity calculation, in particular to a lithium battery capacity calculation method, which comprises the following steps of primary SOC calculation, three-dimensional temperature compensation, curve feature extraction and matching, Kalman filtering fusion and adaptive calibration, breakthrough of voltage platform limitation, elimination of accumulated errors, construction of a full-interval dynamic calibration system and a real-time calibration mechanism. Multi-dimensional coupling compensation, adaptation to an extreme environment and a full life cycle, dynamic curve matching, accurate capture of charge and discharge characteristic changes, minute-level error convergence and meeting of real-time performance and fast charge requirements are realized through five-stage closed loop of primary calculation, dynamic compensation, curve matching, filtering fusion and self-adaptive calibration, time sequence alignment and fast charge are realized, and the real-time performance and the fast charge performance are improved. The DTW algorithm solves curve deviation caused by charge and discharge rate difference, accurately positions SOC nodes, corrects multi-dimensional errors, corrects capacity drift through temperature compensation, suppresses sensor noise through Kalman filtering, and dynamically calibrates and eliminates process errors.

The invention discloses a silicon-carbon composite negative electrode material, a negative electrode plate, a preparation method and application. The silicon-carbon composite negative electrode material is of a double-coating structure and sequentially comprises inner core silicon, a lithium phosphate layer and a fluorine-containing carbon layer from inside to outside, and the mass ratio of the lithium phosphate layer to the inner core silicon is (1-5): 100. When the composite material is applied to a lithium ion battery, the core silicon and the specific double coating layers can improve the fast charging performance and the first effect while optimizing an ion transmission path; a specific double-coating structure can be used as a buffer layer, stress generated by volume expansion of silicon can be released, and pulverization of particles is avoided; and moreover, LiF with high ionic conductivity and higher mechanical strength and an SEI film with more stable regulation and control are formed through reaction with an electrolyte, so that the structural integrity of the material is kept, and the cycle performance of the material is improved.