238 results about "Overcharge" patented technology

The invention relates to the technical field of data processing, in particular to a distributed automobile liquid cooling over-charging control method and system, and the method comprises the steps: merging the operation information of an over-charging network and the real-time charging parameter information in a current time period, and obtaining the merged information; performing internal weight focusing distribution on the merged information to obtain temporary vector representation, and performing multi-target decision prediction according to the temporary vector representation to obtain target charging scheduling strategy information of one or more layers; and according to the target charging parameter information determined by adopting the target charging scheduling strategy information, starting to perform charging scheduling decision on the overcharge charging demand in a time period after the overcharge management of the charging pile. The priority judgment is carried out on different types of charging parameter information and over-charging network operation information based on the internal weight focusing strategy, so that the effect of advanced features is expanded, and the scheduling effect can be improved when the output target charging scheduling strategy information is used for the charging scheduling decision in the next time period.

The invention discloses an overcharge control method and system for an electric vehicle, and relates to the technical field of overcharge control, and the method can accurately predict and evaluate the temperature change of a battery by collecting battery data in real time in the overcharge process and combining a normalized data set and a charging feature vector set. Particularly, by constructing a heat and temperature algorithm model, the system can predict the change trend of the battery temperature in the overcharge process. And when the predicted temperature value Tb exceeds the temperature threshold T, the system can immediately trigger an adaptive charging power and cooling system cooperation mechanism, and automatically adjust the overcharge power Pya and the cooling power Pcool. Through the mechanism, when the battery temperature is close to the safety upper limit, the overheating risk can be effectively avoided, and the safety of the charging process is ensured. According to the measure, the accuracy of battery temperature management is remarkably improved, the risk of battery damage caused by abnormal temperature is reduced, and the service life of the battery is prolonged.

The invention relates to a lithium ion battery overcharge thermal runaway early warning method, early warning device and processing equipment, and the lithium ion battery overcharge thermal runaway early warning method comprises the steps: obtaining an electrochemical impedance spectrum of a lithium ion battery, and obtaining a single-point frequency in a low-frequency region of the electrochemical impedance spectrum; performing direct current charging on the lithium ion battery, and injecting an alternating current power supply of which the frequency is a single-point frequency into the lithium ion battery; acquiring a voltage component and a current component of the lithium ion battery under the alternating current power supply; acquiring the electrochemical impedance of the lithium ion battery according to the voltage component and the current component; and generating overcharge early warning information according to the condition that the imaginary part amplitude of the electrochemical impedance or the real part amplitude of the electrochemical impedance meets a preset condition. Through the technical scheme disclosed by the invention, the problem of lithium ion overcharge thermal runaway can be found in time, the problem of explosion fire caused by thermal runaway caused by lithium ion battery overcharge is avoided, and the operation safety of the energy storage system is ensured.

The invention discloses a lithium battery overcharge early warning system based on big data, and the system comprises a data collection module, a data processing module, a dynamic threshold generation module and a risk analysis module, and relates to the technical field of data processing. A local mean value and a standard deviation are calculated by using a sliding window method, a similar data cluster is constructed by using a dynamic time warping algorithm, and overcharge voltage and temperature thresholds are calculated in combination with a preset risk ratio, so that the limitation of a single Gaussian mixture model is avoided, and the accuracy of the thresholds is improved. Historical data are also acquired, a prediction model is constructed by using an autoregression integral moving average model, a slope is calculated to obtain a correction factor, an aging model constructed by machine learning is combined to update a threshold value, dynamic change and aging of the battery are combined, battery state change is adapted, and early warning reliability and timeliness are improved.

The invention provides an interactive control system and method for a power module and an overcharge pile, a storage medium and a computer program product, and the method comprises the steps: obtaining a charging control parameter according to the input time sequence state data of a battery through a charging control parameter prediction model based on deep learning; generating a power instruction according to the charging control parameter and sending the power instruction to the power module; after the power supply module executes the power instruction, an instruction execution result and battery state data are transmitted back to the overcharge pile main control software; and the overcharge pile main control software adjusts the weight of the charging control parameter prediction model according to the received data or regenerates a power instruction based on the latest battery time sequence state data. According to the invention, the charging time can be shortened, the risks of overheating, overcharging and the like can be prevented, different battery states and complex working conditions can be adapted, and the real-time requirement of an overcharging scene on a control instruction and state data can be met.

The invention relates to a power battery protection method, a storage medium, electronic equipment and a vehicle. The method comprises the steps that under the condition that starting conditions of an overcharge early warning mode are met, a vehicle is controlled to enter the overcharge early warning mode; in the overcharge early warning mode, according to the highest single voltage of the power battery, a first voltage threshold value and the current maximum allowable charging power, an update value of the maximum allowable charging power is determined, and the update value is smaller than the maximum allowable charging power before update; and controlling the power battery according to the updated value. Therefore, the charging power of the power battery can be reduced by reducing the maximum allowable charging power, so that the risk of overcharging of the power battery is reduced, the service life of the power battery is prolonged, and potential safety risks are avoided.

The invention belongs to the technical field of lithium ion battery safety, and provides a lithium ion battery overcharge damage risk early warning method and system, and the method comprises the steps: obtaining the voltage, current, capacity and other data of a lithium ion battery sample in an abnormal working condition test; based on a physical and chemical reaction mechanism in the battery, establishing an electrochemical-thermal coupling damage model of the lithium ion battery; identifying key parameters by using the electrochemical parameters, solving the change of the key parameters in the battery damage evolution process, constructing a damage degree quantitative evaluation model, and calculating the damage degree of the target battery according to the quantitative relationship between the electrochemical parameters and the battery damage degree; and configuring a decommissioning damage threshold according to the capacity attenuation, the battery health state and the side reaction to the battery performance degradation mechanism, comparing the damage degree of the target battery with the decommissioning damage threshold, determining the damage risk level of the target battery, and performing early warning. The method can achieve the quantitative evaluation of the damage degree of the battery, and provides a scientific basis for decommissioning decision.

The invention provides a power battery anti-overcharge method and system of a fuel cell automobile and a vehicle, and the power battery anti-overcharge method of the fuel cell automobile comprises the steps: judging whether a power battery has an overcharge risk or not based on the working condition of the whole automobile and the real-time state of the power battery; if the overcharge risk exists, controlling the fuel cell system to reduce the output power; if the output power is reduced to the lowest stable operation power and the net output power is still higher than the current allowable maximum charging power of the power battery, the fuel cell system is controlled to enter a self-consumption mode, and the electric energy generated by the fuel cell system is guided to an internal auxiliary machine for auxiliary consumption; and maintaining the net output power not to be greater than the current allowable maximum charging power. The overcharge risk when the charging capacity of the battery is reduced due to low temperature or energy recovery is effectively solved, direct shutdown is replaced by intelligent hierarchical control, the start-stop frequency of the fuel battery is remarkably reduced, the service life of the fuel battery is prolonged, and the economical efficiency of the whole vehicle is improved.

The invention relates to the technical field of artificial intelligence, in particular to an electrochemical energy storage battery overcharge safety early warning method based on a large model, which comprises the following steps: collecting a literature data set, an experiment data set, an expert experience set and phenomenon description information; then, energy storage mechanism entities are extracted through a BERT-NER algorithm, and a mechanism map is constructed in a pairing mode; collecting energy storage bin detector data in real time, calculating a time sequence characteristic change rate, and generating a detection cue word in combination with phenomenon description; and inputting the mechanism graph and the cue word into a large language model for training, and generating a prediction result. According to the method, multi-source data are fused, the overcharge risk is effectively early warned through large model analysis, and safe operation of the electrochemical energy storage battery is ensured.

The invention discloses a lithium ion battery overcharge thermal runaway analysis method, which comprises the following steps: carrying out an adiabatic overcharge thermal runaway experiment on a lithium ion battery, and recording state parameters of the lithium ion battery in real time; and performing stage division on the adiabatic overcharge thermal runaway process of the lithium ion battery according to the change of the state parameters of the lithium ion battery, determining the states of the lithium ion battery corresponding to different stages, and evaluating the thermal runaway risk levels of the lithium ion battery at different stages. When the lithium ion battery is applied to power equipment such as a new energy automobile, analysis can be assisted by the analysis method once a thermal runaway accident occurs, so that the investigation process of the thermal runaway accident can be accelerated and simplified in an assisted manner, and the thermal runaway accident can be investigated efficiently at low cost. Meanwhile, the analysis method can assist in monitoring the charging state of the lithium ion battery so as to ensure the use safety of the lithium ion battery and reduce the occurrence of thermal runaway accidents.

The utility model discloses a charging power cabinet and a charging system suitable for realizing overcharge full matrix switching, the charging power cabinet is suitable for being connected with a plurality of charging terminals, the plurality of charging terminals at least comprise an overcharge terminal and the rest are fast charge terminals, the charging power cabinet comprises a power supply module, a power distribution module and a charging control module, the power distribution module comprises output buses and a plurality of switches, the number of the output buses is consistent with that of the power supply units in the power supply module, each fast charging terminal is connected with one output bus, and the output buses are fast charging buses; each overcharge terminal is connected with two output buses, and the two output buses are both overcharge buses; moreover, at least one disconnection bus is not connected with any charging terminal, and any output bus which is not directly connected with the overcharge bus or the disconnection bus is connected to any overcharge bus or disconnection bus through a fourth switch. The charging power cabinet can realize full-matrix switching of the over-charging terminal.

The invention discloses a method for carrying out overcharge protection by utilizing a voltage change rate, which comprises the steps of S1, monitoring the voltage change rate in real time, S2, carrying out data analysis processing and early warning, S3, processing an abnormal condition, S4, carrying out settlement comparison on a recorded result and the like, so as to obtain an abnormal result of the voltage change rate of a battery. According to the method, by monitoring the voltage change rate of the battery in real time, the abnormal performance of the battery can be found in time, the real-time performance and the accuracy of battery testing are improved, the safety and the reliability of the battery can be guaranteed, early warning can be carried out on the overcharge condition of the battery, and potential safety hazards caused by overcharge and overdischarge of the battery due to personnel errors are prevented; and meanwhile, the service life of the battery is ensured, and the abnormity of the voltage change rate can be found in time, so that the battery failure is effectively prevented, the use safety and reliability of the battery are improved, and the safety of testers is also ensured.

The invention discloses a battery overcharge aging detection method and device, electronic equipment and a medium, relates to the field of power electronics, and considers that the capacity and the ohmic internal resistance of a battery in the charging and discharging process change continuously, the ohmic internal resistance of the battery is iterated in real time by using a particle swarm algorithm in the scheme. The most accurate current ohmic internal resistance in the ohmic internal resistance iterated by the particle swarm algorithm is determined according to the current end voltage and the current end current detected in real time in the unit constant-current charging and discharging period; the change rate of the capacity peak value of the battery and the relative change rate of the internal resistance capacity are obviously different from those in a normal aging condition, so that the change rate of the capacity peak value of the battery and the relative change rate of the internal resistance capacity need to be determined, and the overcharge aging degree of the battery is further determined. According to the scheme, the overcharge aging degree of the battery can be accurately determined without disassembling the battery.

The invention discloses a power distribution network reactive power optimization configuration method and system considering an overcharge load characteristic. The method comprises the following steps that the number and frequent parking positions of electric vehicles, grid-connected nodes of all over-charging stations and the number of all types of charging piles are collected; calculating the number of electric vehicles needing to be served by each overcharge station; simulating a daily initial charge state and a daily driving distance of each electric vehicle; simulating daily multiple travel behaviors of each electric vehicle; calculating the parking time and the parking duration of each travel of the electric vehicle; the charging requirement and type of each electric vehicle during parking each time are judged; calculating the time domain load of each charging pile; a pre-constructed power distribution network reactive power optimization configuration model considering reactive power facility locating and sizing constraints is adopted, a power distribution network reactive power optimization configuration construction scheme is obtained, and the scheme is implemented to complete power distribution network reactive power optimization configuration. According to the method, the construction cost of reactive power optimization configuration can be reduced while the voltage of the power distribution network does not exceed the lower limit due to the overcharge pulse load.

The utility model discloses an overcharge liquid cooling device in the technical field of overcharge, which comprises a protective shell, a cooling tank is arranged on the inner wall of the protective shell, the cooling tank is arranged towards one end in a penetrating manner, the inner wall of the cooling tank is fixedly connected with a liquid cooling assembly, and the inner wall of one end, far away from the liquid cooling assembly, of the cooling tank is fixedly connected with a circulating pipe. The bottom of the end, close to the circulating pipe, of the cooling tank is fixedly connected with a temperature sensor. The protective shell is fixed to the outer wall of the overcharge working equipment through the outer wall fixing equipment, then the working temperature of the overcharge working equipment is detected through the temperature sensor, the detected temperature is sent to the external intelligent control equipment, and then the circulating pump is started to input cooling liquid into the circulating pipe; the cooling operation is performed on the over-charging equipment through the cooling liquid and the circulating pipe, and meanwhile, the cooling motor is started to drive the cooling fan blades to be matched with the cooling groove to improve the over-charging cooling effect, so that the working efficiency of the super-charging column is improved.

The invention relates to the technical field of battery replacement cabinet charging detection, and provides a charging detection method and system for batteries of a battery replacement cabinet. The method comprises the following steps: setting initial parameters according to layout information of a charging bin of a battery changing cabinet; determining a candidate strategy based on the initial parameters in combination with voltage overcharge protection and current overcurrent protection conditions; based on a candidate strategy, configuring a first regulation and control vector in a gain space in a stepped manner by direct-current voltage, and configuring a second regulation and control vector in a digital space in a stepped manner by a pulse width duty ratio; establishing a charging strategy search space through the two types of regulation and control vectors; and performing Pareto screening in the space to obtain a service life, efficiency and safety performance non-dominated solution set, and determining an optimal strategy, so as to solve the technical problem that safety, charging efficiency and cycle life optimization are difficult to consider in the charging process of the battery of the battery changing cabinet, and achieve the purposes of constructing a charging strategy search space through a multi-dimensional regulation and control vector and performing Pareto screening to obtain a charging strategy. The technical effects of prolonging the charging and discharging service life, improving the charging efficiency and improving the safety performance are achieved.

The invention provides an overcharge safety electrolyte for a lithium ion battery and the lithium ion battery, and relates to the technical field of lithium battery electrolytes. The overcharge safe electrolyte for the lithium ion battery comprises the following components: lithium salt, a solvent, a film-forming additive and an overcharge-preventing additive, the overcharge-preventing additive is a compound with a cyclohexyl organic functional group, and the weight percentage of the overcharge-preventing additive in the overcharge safe electrolyte is 0.5 wt%-5wt%. The electrolyte using the compound with the cyclohexyl organic functional group as the anti-overcharge additive can effectively protect the lithium ion battery under the overcharge condition, and the internal resistance of the battery is rapidly increased to enable the voltage to rapidly rise to the overcharge cut-off voltage in a short time, so that the temperature rise of the battery caused by long-time overcharge can be avoided, and the service life of the lithium ion battery is prolonged. Therefore, the thermal runaway problem is considered from the temperature perspective, and the safety of the battery is improved.

A hybrid vehicle control method and apparatus, a device, a hybrid vehicle, and a storage medium. The method comprises: when in an overcharge prevention mode, determining the actual SOC value of a power battery; determining a first target power corresponding to the actual SOC value, wherein there is a positive correlation between the actual SOC value and the first target power, and the first target power does not exceed the maximum charge / discharge power of the power battery; determining an actual power currently required by the hybrid vehicle, and determining a second target power on the basis of the actual power and the first target power, wherein the second target power = the actual power - the first target power; and setting the output power of a power component of the hybrid vehicle to the second target power. According to the control method, the hybrid vehicle is controlled by means of the second target power obtained after the first target power is subtracted, and thus, overcharge of the power battery can be effectively prevented.

The invention relates to the technical field of lithium batteries, and provides a lithium battery overcharge protection control method and system, and the method comprises the steps: obtaining a voltage value, a voltage change rate, a temperature value and a temperature change rate of each battery cell in a lithium battery, carrying out the interval consistency correction, constructing a battery cell state data set and a change trend feature set, carrying out the state trend analysis, and obtaining a state data set; obtaining the current risk grade and the composite risk factor value of each battery cell, matching the composite risk factor value with the current risk grade to obtain a charging adjustment instruction set, and adjusting a charging control module of the lithium battery according to the charging adjustment instruction set. Through trend analysis, temperature rise change in a future charging period is accurately simulated, and critical proximity and abnormal probability are evaluated in combination with a temperature rise safety interval, so that early warning is realized, real-time control of charging current limiting and voltage amplitude limiting is realized, and the problem of protection delay or excessive protection in a complex battery environment in the prior art is solved.

The invention discloses a liquid-cooling over-charging terminal and a cooling control system thereof.The liquid-cooling over-charging terminal comprises a liquid-cooling over-charging terminal shell, a liquid-cooling over-charging terminal door body is hinged to one side of the liquid-cooling over-charging terminal shell, a partition plate is arranged in the liquid-cooling over-charging terminal shell, and a control module is arranged in the liquid-cooling over-charging terminal shell; a switching power supply module is arranged at the position, below the control module, in the liquid cooling over-charging terminal shell, a gun line is arranged at an interface of the switching power supply module, and a liquid cooling charging gun is arranged at the end of the gun line; the heat insulation plates are designed in the cooling box, cooling liquid at different temperatures is separated, heat exchange is reduced, the respective temperatures are kept stable, in addition, the heat dissipation effect is further enhanced through the heat conduction design of the bottom of the cooling box and the extension part structure, through the design of the first forked cylinder and the second forked cylinder, accurate control over the flowing path of the cooling liquid is achieved, and the cooling effect is improved. And the flow and the direction of the cooling liquid can be adjusted according to actual requirements, so that more accurate temperature control is realized.

The invention relates to the technical field of lithium battery charging equipment, in particular to an overcharge protection lithium battery charger which comprises a shell, a charging protection board circuit and an output power port. The charging protection board circuit is provided with a monitoring protection module, a mechanical protection module and a logic control module. The monitoring protection module accurately identifies an overcharge abnormal state by measuring a lithium battery AC impedance spectrum in real time, and rapidly triggers the electronic protection unit to execute a cut-off action. And if the electronic protection fails, the mechanical protection module acts quickly, and the charging loop is physically disconnected. The logic control module coordinates automatic switching of the two protection modes, and the intelligence and reliability of protection are improved. The lithium battery charger is simple and reasonable in structure, high in monitoring sensitivity and rapid and reliable in protection action, has a perfect redundancy protection structure and a convenient reset mechanism, effectively overcomes the defects in the prior art, and remarkably improves the safety performance and reliability of the lithium battery charger.

The invention relates to a lithium battery fault prediction method and system, and relates to the field of lithium battery fault diagnosis, and the method comprises the steps: recognizing the similarity between an actual condition graph and a standard condition graph, and carrying out the calculation to obtain the condition significance; and according to the plurality of voltage change saliency degrees, the plurality of current change saliency degrees and the plurality of temperature change saliency degrees, carrying out overcharge fault prediction on the lithium battery pack to obtain a first overcharge fault coefficient, and carrying out correction calculation on the first overcharge fault coefficient by adopting the condition saliency degree to obtain a second overcharge fault coefficient as a lithium battery fault prediction result. According to the invention, the technical problem that an existing lithium battery overcharge fault prediction method generally depends on a fixed threshold value or simple analysis based on a single parameter, and the prediction accuracy and reliability are insufficient can be solved; the overcharge fault prediction is carried out by fusing the multi-dimensional data, so that the accuracy and reliability of fault prediction can be improved, potential risks in the charging process can be identified in advance, and the use safety of the lithium battery is remarkably improved.

The invention discloses an electric container truck overcharge facility collaborative planning method considering traffic network-power grid interaction, and the method comprises the steps: building a charging demand space distribution model according to the energy consumption heterogeneity characteristics of multiple types of transportation tasks of an electric container truck; a node marginal electricity price mechanism is introduced, and a charging station selection equalization model with the purpose of total cost minimization is established; based on a direct current optimal power flow model theory, constructing a power distribution network operation model taking the minimization of the total power generation cost as a target; the method comprises the following steps: constructing an electric container truck overcharge facility collaborative planning model considering traffic-power network interaction, carrying out conversion processing on the model to obtain a plurality of differentiable obstacle sub-problems, and solving the plurality of differentiable obstacle sub-problems by using an interior point method to obtain a traffic network-power network interaction overcharge facility optimization setting scheme. According to the method, the problem of collaborative optimization of charging facility deployment and power grid impact in electric transformation in the field of port collection and distribution is solved, efficient and stable collaborative decision support is provided for port electric container truck charging network planning, and the method has remarkable application value.

The present invention discloses a lithium battery overcharge protection circuit for a shaver, comprising a chip IC1, a power supply terminal VCC, a resistor R3, a resistor R2 and a transistor Q2, wherein the power supply terminal VCC is electrically connected to one end of the resistor R3, an end of the resistor R3 away from the power supply terminal VCC is electrically connected to the 5-pin of the chip IC1, the power supply terminal VCC is electrically connected to one end of the resistor R2, an end of the resistor R2 away from the power supply terminal VCC is electrically connected to the collector of the transistor Q2, the base of the transistor Q2 is electrically connected to the 7-pin of the chip IC1, and the emitter of the transistor Q2 is grounded. The present invention discloses a lithium battery overcharge protection circuit for a shaver, wherein no current is long to charge the battery regardless of whether the battery is fully charged or not.

The invention discloses a power supply system and a charging method of a new energy automobile and the new energy automobile, and belongs to the technical field of new energy. Determining a charging mode; if the battery pack is in the overcharge mode, the BMS controls the first switching relay group to be closed, so that the battery pack is configured into two battery branches which are connected in parallel to be connected into a main loop, and each battery branch comprises three single-pack batteries; the main loop relay group and the charging relay group are controlled to be closed, so that the charging module charges the two battery branches through the main loop; if the battery pack is in the general charging mode, the BMS controls the second switching relay set to be closed, so that the battery pack is configured into three battery branches connected in parallel to be connected into the main loop, and each battery branch comprises two single-pack batteries; and the main loop relay group and the charging relay group are controlled to be closed, so that the charging module charges the three battery branches through the main loop. Switching between high-voltage charging and low-voltage charging can be achieved, the charging time can be shortened, and the cost can be reduced.

1. The name of the product of this design: battery testing equipment. 2. Purpose of the product of this design: Battery testing equipment used to perform charging rate test, discharging rate test, overcharge protection test, over-discharge protection test, wake-up test and forced charge test on batteries. 3. The design key point of this appearance design product lies in the shape. 4. The picture or photo that best illustrates the design points: three-dimensional picture.

The utility model relates to the technical field of batteries, and discloses an over-current fusing structure for avoiding secondary contact and a battery, the over-current fusing structure for avoiding secondary contact comprises a connecting sheet which is electrically connected with a battery cell and a busbar, the connecting sheet is provided with a fusing part which is fused when the current exceeds a set value, and the fusing part is provided with an insulated fixing piece; when the battery is abnormal in the using process, such as over-charging or over-discharging, the current passing through the connecting piece is too large instantly, or when the current passing through the fusing part exceeds a set value in the using process of the battery, the fusing part is fused, so that the electrical connection between the battery core and the outside is cut off, and after the fusing part is fused, the battery can be quickly maintained and replaced, and meanwhile, the service life of the battery is prolonged. And after the fusing part is fused, the fixing piece arranged on the fusing part is used for connecting and fixing the connecting sheet, and the fixing piece is insulated, so that the secondary electrical connection contact of the battery cell is avoided, and greater harm is avoided, and the fused connecting sheet can be quickly disassembled and replaced.

The invention provides a model training method, a battery cell overcharge detection method and related equipment, and relates to the technical field of battery cell detection. The training method comprises the following steps: acquiring performance data of a battery cell sample and a corresponding overcharge test result; feature extraction is carried out on the performance data of the battery cell sample, a first feature set is constructed, and the first feature set is used for representing features determined according to the performance data of the battery cell sample; screening features meeting a preset correlation condition with the overcharge test result from the first feature set, and constructing a second feature set; screening features of which the feature contribution degrees exceed a preset contribution degree threshold value from the second feature set, and constructing a third feature set; and training the to-be-trained overcharge detection model based on the features in the third feature set and the corresponding overcharge test result, and if a training stop condition is satisfied, obtaining a target overcharge detection model so as to perform overcharge prediction by using the target overcharge detection model.

The invention discloses a power battery full life cycle overcharge protection method comprising the following steps: S1, through a battery cycle life test, obtaining a charging target monomer voltage VqN and a charging target monomer current IqN, and recording the charging target monomer voltage VqN and the charging target monomer current IqN in a parameter comparison table; s2, in the charging process of the power battery, voltage values of all the single battery cells in the power battery are collected in real time, and the highest real-time voltage value Vmax in all the single battery cells is obtained through calculation; s3, the current number of charging cycles of the power battery is confirmed, and the charging target monomer voltage VqN and the charging target monomer current IqN at the current number of charging cycles are obtained by looking up the parameter comparison table; s4, calculating a difference value between the VqN and the Vmax, maintaining the original charging current of the power battery for charging when the difference value is greater than a threshold value X, and executing a step S5 when the difference value is less than or equal to the threshold value X; s5, setting the requested charging current as IqN or reducing the requested charging current to IqN, and stopping charging until Vmax is greater than or equal to VqN; the invention has the advantages of better protecting the power battery and prolonging the service life of the power battery.

The invention discloses an overcharge system and a control method thereof, and relates to the technical field of charging. The system comprises a multi-winding transformer, at least two charging modules and at least two charging interfaces, one end of each charging module is correspondingly connected with a secondary winding of the multi-winding transformer, and the other end of each charging module is correspondingly connected with at least one charging interface; the charging module comprises a first charging unit, M second charging units, a first switch unit and a second switch unit, one end of the first charging unit and one end of each second charging unit are connected with the corresponding secondary winding, and the other end of the first charging unit is connected with each charging interface corresponding to the charging module through the first switch unit; the other end of each second charging unit is connected with a charging interface corresponding to the charging module through a second switch unit; wherein the first charging unit is a two-stage transformation topology, and the second charging unit is a single-stage transformation topology. Therefore, the charging efficiency of the overcharging system is improved.