1311 results about "Discharge current" patented technology

To enable accurate estimation of a degree of deterioration of a secondary battery with a metal lithium layer on an anode.SOLUTION: A battery deterioration estimation device comprises a current measurement part, a voltage measurement part, a calculation part, and an estimation part. The current measurement part measures a discharge current of a secondary battery at predetermined timing immediately after the start of discharge of the secondary battery. The voltage measurement part measures a drop voltage that is a difference between a voltage of the secondary battery before the start of discharge and a voltage of the secondary battery at the predetermined timing. The calculation part calculates an internal impedance of the secondary battery at the predetermined timing from the measured discharge current and the measured drop voltage. The estimation part estimates a degree of deterioration of the secondary battery from the calculated internal impedance.SELECTED DRAWING: Figure 1

The invention relates to the field of battery safety management, in particular to a battery pack safety management method and system based on an intelligent algorithm. A battery pack safety management system based on an intelligent algorithm comprises a battery pack parameter monitoring module, a weight calculation module and a fault prediction module. According to the method, key parameters such as the single voltage, the total voltage, the charging and discharging current and the cell surface temperature are acquired in real time, the dynamic threshold values of the total voltage, the charging and discharging current and the charge state are calculated respectively, judgment is performed in combination with the preset fixed threshold value, abnormal conditions in the running process of the battery pack can be found in time, and corresponding abnormal response measures are executed; comprehensive real-time monitoring and dynamic threshold judgment of the parameters of the battery pack are achieved, the safety and reliability of the battery pack are effectively improved, and safety accidents caused by abnormal parameters are prevented.

The invention discloses a power-on reset circuit, and relates to the technical field of integrated circuits, in order to eliminate static power consumption of the power-on reset circuit and reduce power consumption of the power-on reset circuit, the power-on reset circuit comprises a discharge delay circuit, a current mirror circuit and a buffer circuit; the discharge delay circuit comprises a capacitor and an NMOS (N-channel Metal Oxide Semiconductor) tube M4, and the NMOS tube M4 is used for discharging the capacitor; the current mirror image circuit comprises an NMOS tube M2, an NMOS tube M3 and a PMOS tube M9. The grid electrode of the NMOS tube M2 and the grid electrode of the PMOS tube M9 are respectively connected with the output end of the buffer circuit; the grid electrode of the NMOS tube M3 is respectively connected with the source electrode of the PMOS tube M9, the drain electrode of the NMOS tube M2 and the grid electrode of the NMOS tube M4; the current mirror image circuit is used for turning off the NMOS tube M2 after the reset signal is ended, and pulling up the drain electrode voltage of the NMOS tube M3 to the power supply voltage through the PMOS tube M9, so that the NMOS tube M3 enters a deep linear region, and a direct current path from the power supply to the ground in the current mirror image circuit is cut off; and the buffer circuit is used for outputting a reset signal according to the voltage change of the capacitor in the discharge delay circuit.

A power tool system includes a power tool, a sensor, and an electronic controller of the power tool. The power tool includes a power tool housing, a motor housed within the power tool housing, and a pack interface coupled to the power tool housing. The pack interface receives a power tool battery pack having a corresponding tool interface. The sensor senses an electrical parameter corresponding to a power tool battery pack coupled to the pack interface. The electronic controller of the power tool controls the power tool battery pack to discharge current; receives an output of the sensor when the power tool battery pack is controlled to discharge current; generates a temperature estimate by processing the output of the sensor using a thermal model stored on the memory; and generates a temperature warning signal in response to the temperature estimate exceeding a temperature threshold.

The embodiment of the invention provides a preparation method of a negative electrode active material, the negative electrode active material, a battery and equipment. Fluorine-containing gas is used as discharge gas, and discharge current is introduced into a plasma treatment device in the process of performing vibration dispersion treatment on a porous carbon substrate through the plasma treatment device; the fluorine-containing gas is used for carrying out plasma discharge treatment on the porous carbon matrix, so that the fluorine element provided by the fluorine-containing gas can react with carbon atoms on the surface of the porous carbon matrix to form chemical bonding, and the chemical bonding uniformity between the fluorine element and the carbon atoms on the surface of the porous carbon matrix can be improved; and the preparation cost of the negative electrode active material can be reduced, and the preparation efficiency of the negative electrode active material is improved, so that the battery capacity and the cycle performance of a secondary battery prepared from the negative electrode active material disclosed by the embodiment of the invention can be improved.

The invention relates to the technical field of vehicles, in particular to a power battery residual energy determination method and device, a vehicle and a storage medium, and the method comprises the steps: obtaining the battery rated capacity of the vehicle, the battery discharge current average value in a first preset time range, and the battery charge state, the battery health state and the battery temperature at the current moment; determining a corresponding correction coefficient according to the battery health state, the battery temperature and the battery discharge current average value; correcting the rated capacity of the battery according to the correction coefficient to obtain a corrected value of the rated capacity of the battery; and calculating the residual energy of the power battery according to the battery rated capacity correction value and the battery charge state. The residual energy of the power battery can be accurately estimated, and data reference is provided for safe operation of a vehicle.

The invention discloses a direct current charging and discharging control system and method, and relates to the technical field of battery charging and discharging, and the system comprises the steps: monitoring the input and output voltage and current, the battery state parameters and the environment temperature in real time; judging whether the charging and discharging control mode is a charging mode, a discharging mode or a mixed mode according to the analysis result; if the charging mode is determined, the charging current is dynamically adjusted based on a self-adaptive closed-loop control unit; if a discharging mode is determined, dynamically distributing a discharging current based on a load grading strategy and the residual electric quantity of the battery; and if it is judged that the mode is the mixed mode, charging and discharging parallel control is carried out through the dynamic power distribution unit. The technical problems that in the prior art, a charging and discharging control strategy is single, complex and changeable working conditions cannot be adapted, and key parameters are difficult to accurately monitor in real time to achieve efficient battery management are solved, and the technical effects of improving the energy utilization efficiency and enhancing the equipment operation stability and reliability are achieved.

The invention discloses an efficient charging and discharging control method and system for a capacitive energy storage welding machine, and the method comprises the steps: the capacitive energy storage welding machine monitors the voltage, current and temperature of a capacitor in real time through a battery management system, and determines the system state and the environment temperature; in the direct current discharging mode, the system dynamically adjusts the charging and discharging rate through an inverter and a self-adaptive control algorithm, and voltage output is smoothed; in the indirect discharge mode, a welding transformer is adopted to reduce the voltage and accurately control the frequency and time of the inverter; the system automatically adjusts charging and discharging current and discharging time according to the thickness, speed and temperature of a welding material, and intelligently switches modes; a multi-safety protection mechanism ensures the safety of the welding process, and a power supply is automatically adjusted or cut off when abnormity occurs; according to the efficient charging and discharging control method and system for the capacitive energy storage welding machine, the safety of the welding-free transformer capacitive energy storage welding machine is improved, the phenomena of huge sound and metal splashing are reduced, meanwhile, the energy utilization efficiency is improved, the welding quality is improved, and the production efficiency is enhanced.

The invention discloses a method for monitoring the service life of a power battery, and the method comprises the steps: collecting the vehicle speed, acceleration, battery discharge current, temperature distribution and other data, combining the vehicle speed fluctuation and a power system load state, precisely dividing urban congestion, suburban medium-speed and high-speed cruise conditions, introducing a dynamic discharge depth factor, and obtaining the service life of the power battery. Factors such as battery charge state variation, a current root-mean-square value and the highest temperature of a battery cell are integrated, different temperature compensation coefficients are set according to a battery chemical system, the discharge depth is scientifically quantified, the proportion of the number of discharge events in each working condition depth is counted, and when the proportion exceeds a corresponding safety threshold value, graded alarm prompts are output. Different early warnings are given out according to the number of working conditions exceeding the threshold value, the peak discharge power of the battery is limited when red early warnings are given out, excessive loss of the battery is avoided, when the dynamic discharge depth factor is increased to exceed a certain amplitude, battery health emergency detection is directly triggered, potential problems are found in time, safe and stable operation of the battery is guaranteed, and the use safety of the vehicle is improved.

The invention provides a hoisting machinery amplitude variation process energy management method and system based on a supercapacitor, and relates to the technical field of energy management, and the method comprises the steps: calculating the theoretical energy demand of an amplitude variation process through a neural network prediction model, correcting a dynamic grouping coefficient to obtain a power distribution coefficient, and calculating the power distribution coefficient; and taking the result as the upper limit of the charging and discharging power of each group of super capacitors, and adjusting the charging and discharging current through a self-adaptive PI controller. When the amplitude variation angle is reduced, regenerative braking energy exceeding the rechargeable power of the super capacitor is stored in a high-temperature superconducting energy storage inductor, and the energy is charged into the super capacitor according to a power distribution coefficient when the condition is allowed; when the amplitude variation angle is increased, the output power ratio of the main power supply to each group of super capacitors is optimized by adopting a dynamic programming algorithm, and power cooperative control is realized through a sliding mode and an active-disturbance-rejection controller, so that the stability of the system voltage is ensured. The energy utilization efficiency can be effectively improved, the service life of the supercapacitor is prolonged, and the system stability is ensured.

The invention provides a battery charging rate determination method and device, electronic equipment and a storage medium. The method comprises the following steps: obtaining a self-discharge current of a battery in each cycle charging process; the self-discharging current is the self-discharging current collected in the constant-voltage charging process when the battery is charged at a first charging rate in each circulating charging process until the electric quantity parameter of the battery reaches a preset electric quantity parameter and the battery is continuously charged in a constant-voltage charging mode; the values of the first charging multiplying power of the battery are different in different cyclic charging processes; and determining the corresponding maximum charging rate of the battery under the preset electric quantity parameter based on the self-discharging current. According to the embodiment of the invention, the maximum charging rate of the battery is determined based on the self-discharging current, and the battery is guided to be charged through the maximum charging rate, so that metal deposition in the battery can be reduced, and the risk of side reaction can be reduced while the charging efficiency of the battery is improved.

A battery heating system includes: a temperature monitoring circuit configured to output a temperature monitoring signal; a voltage conversion circuit configured to receive a first voltage that is input by a power supply or a second voltage that is input by a to-be-heated battery; and a control circuit configured to receive the temperature monitoring signal and output a control signal. The voltage conversion circuit is configured to perform boosting processing or bucking processing on the first voltage based on the control signal or perform boosting processing or bucking processing on the second voltage based on the control signal to enable the to-be-heated battery to receive a charging current from the power supply in a first time segment using the voltage conversion circuit and the to-be-heated battery to output a discharging current to the power supply in a second time segment using the voltage conversion circuit.

The invention provides a method for evaluating the online health state of an electric vehicle lithium ion battery through a data fusion model, and relates to the technical field of lithium ion battery health state evaluation. A plurality of groups of voltage, discharge current and internal resistance data are collected under a specific working condition, respective average values are obtained through calculation, and then a voltage health factor, a current health factor and an internal resistance health factor are constructed by combining rated values with the average values and maximum and minimum values. On the basis of the health factors and variance data, on one hand, a comprehensive health index is obtained through a weighted average algorithm, a preset threshold value comparison result is assigned, on the other hand, a comprehensive scoring formula is constructed according to variance and threshold value comparison result assignment, and the lithium ion battery health state is comprehensively judged according to different result assignments; and outputting normal, sub-health and fault states.

The invention belongs to the technical field of battery temperature control, and provides a blade battery temperature control method and system based on a fuzzy neural network, and the method comprises the following steps: monitoring the temperature of a battery cell and a phase change material in real time, monitoring the charging and discharging current of a battery in real time through a current transformer, and obtaining current data; preprocessing the battery cell temperature data, the phase change material temperature data and the current data to obtain preprocessed data; the preprocessed data serve as input variables and are input into a fuzzy neural network for fuzzy processing, and a temperature adjusting instruction is generated according to the preset working temperature range of the blade battery; according to the temperature adjusting instruction, the temperature of the blade battery is adjusted, and the temperature change is monitored in real time; through the complex mapping capability of the fuzzy neural network, accurate control over the battery temperature is achieved, temperature fluctuation is reduced, the consistency of battery performance is improved, and the temperature control performance of the blade battery is improved.

The invention discloses a battery rate adjusting method and system based on joint calculation, and the method comprises the steps: collecting real-time operation parameters of a battery, the real-time operation parameters comprising a real-time current, a real-time voltage observation value, a first electrochemical impedance spectrum, a first temperature stress and a first cycle index; obtaining an SOH value based on the first electrochemical impedance spectrum, the first cycle index and the first temperature stress; estimating based on the SOH value and the real-time current to obtain a first SOC value; correcting the first SOC value based on the real-time voltage observation value to obtain a second SOC value; and determining a first charge-discharge rate according to the SOH value and the second SOC value, and controlling the charge-discharge current of the battery according to the first charge-discharge rate. According to the method, the problems that SOC estimation is not accurate, SOH evaluation lacks dynamics, and rate control is single are solved, and intelligent and self-adaptive adjustment of charge and discharge rates of the battery in different operation states is achieved.

The invention discloses an electric energy discharge control device. The energy storage circuit is used for storing potential storage electric energy; the bleeder circuit is used for releasing the potential storage electric energy through a bleeder resistor and a bleeder transistor which are connected in series; the reference voltage setting circuit is used for outputting a reference voltage signal; the bleeder sampling feedback circuit is used for outputting a bleeder sampling feedback electric signal according to the bleeder sampling current of the bleeder resistor; the post-stage voltage feedback circuit is used for outputting a post-stage voltage feedback electric signal according to the potential storage voltage; and the conduction degree of the discharge transistor is controlled according to the post-stage voltage feedback electric signal, the reference voltage signal and the discharge current collection feedback electric signal. The conduction degree of the bleeder transistor is dynamically controlled according to the bleeder current collection feedback electric signal and the post-stage voltage feedback electric signal, so that the change of potential storage electric energy of the energy storage device is dynamically adapted, the bleeder power and the current of the bleeder circuit are stable and controllable, and a higher bleeder rate can be realized under the condition that the bleeder power and the current are kept unchanged.

A short circuit identification method is provided for a sampling element of a battery management system. A temperature sensor is disposed in a battery management system to monitor a temperature of a discharge transistor, and the method includes: obtaining the temperature of the discharge transistor by using the temperature sensor, and calculating a temperature difference of the discharge transistor in a preset duration; comparing a discharge current obtained by using a sampling element with a preset current threshold; and determining that the sampling element is short-circuited. In embodiments of the present application, the temperature sensor is used to monitor the temperature change rate of the discharge transistor in the BMS system, it can be detected that only one sampling element has a short-circuit fault with reference to the discharge current obtained by the sampling element, and corresponding protection measures are taken, so that the BMS system runs safely and stably.

The invention provides a hysteresis coefficient calibration method for a battery, and the method comprises the following steps: discharging the battery from a first initial charge state to a first target charge state through a plurality of unequal discharge currents, and measuring the open-circuit voltage, corresponding to the first target charge state, of the battery after standing for a preset period of time; the measured open-circuit voltage is compared with a reference open-circuit voltage determined according to a reference OCV-SOC corresponding relation to determine a hysteresis coefficient, and the hysteresis coefficient represents the deviation degree of the OCV-SOC corresponding relation of the battery relative to the reference OCV-SOC corresponding relation caused by the hysteresis effect; and determining a corresponding relationship between the discharge currents and the hysteresis coefficients based on the plurality of discharge currents and the corresponding hysteresis coefficients. The present application also proposes a state of charge determination method for a battery, a computer program product, an electronic device, and a vehicle. According to the invention, the state of charge of the battery can be determined more accurately.

The invention provides a storage battery starting capability prediction method and device, electronic equipment and a medium, and the method comprises the steps: obtaining the change data of the current and voltage of a storage battery when an engine is started this time; determining the moment corresponding to the maximum discharge current, the internal resistance of the starter at the moment and the internal resistance of the storage battery at the current increasing stage in the starting process of the engine based on the change data of the current and the voltage of the storage battery; and inputting the internal resistance of the storage battery and the internal resistance of the starter into a pre-constructed starting capability model to predict the starting voltage which can be provided by the storage battery when the engine is started next time. According to the invention, the prediction accuracy of the starting capability of the storage battery is improved.

After the temperature of a battery rises to a predetermined diagnosis temperature, a charge / discharge control unit controls a charge / discharge circuit to charge or discharge the battery. A current-voltage detection unit detects current and voltage of the battery during a period in which the battery is charged or discharged. A differential voltage calculation unit calculates a differential voltage of the battery on the basis of the detected current and voltage. A deterioration state estimation unit estimates a deterioration state of the battery on the basis of a change in the calculated differential voltage.

The present invention relates to a manipulator control device and a robot based on kinetic energy recovery. The manipulator control device includes a motor, a motor drive module, a controller and an energy storage device; the motor drive module is connected to a power source, and controls the rotation of the motor through a control signal sent by the controller; the energy storage device is connected to the motor drive module, and receives the reverse current transmitted from the motor through the motor drive module and stores electric energy when the motor decelerates; and / or releases the stored electric energy to output a discharge current when the motor accelerates, and the discharge current is transmitted to the motor through the motor drive module. The manipulator control device based on kinetic energy recovery of the present invention, by providing an energy storage device, stores energy when the motor decelerates and releases energy when the motor accelerates, which can not only reduce the heating of the motor and improve the safety of equipment operation, but also save energy and reduce costs.

The invention discloses a high-voltage direct-current line EM lightning arrester valve plate shunting non-uniformity test system and method, and belongs to the technical field of lightning arrester performance test.The method comprises the steps that S1, a high-voltage direct-current power transmission system simulation model is established, and the discharge current of an EM lightning arrester under the severe working condition of single-pole line short circuit is evaluated based on the high-voltage direct-current power transmission system simulation model; adopting square-wave pulse approximate discharge current, and determining the total amplitude and square-wave pulse width of long-wave discharge current of the EM lightning arrester; s2, applying the square wave pulse to the tested EM lightning arrester resistor discs through a shock wave test platform, and testing the current magnitude and the total current of each resistor disc of the EM lightning arrester under the working condition; the total amplitude and the square wave pulse width of the preset square wave pulse are the same as the total amplitude and the square wave pulse width of the long wave of the discharge current of the EM arrester; and S3, according to the current of each resistor disc and the total current, calculating a current non-uniform coefficient and the current range of the resistor discs. According to the invention, the current distribution non-uniformity of the multi-column parallel lightning arrester can be tested and evaluated more reasonably and comprehensively.

The invention discloses a Hall thruster and a Hall thruster regulation and control method, and relates to the technical field of power devices, and the Hall thruster comprises a hollow cathode and a Hall accelerator. The hollow cathode is used for emitting electrons, the Hall accelerator comprises an anode, a first magnet exciting coil, a second magnet exciting coil, a discharge channel and a regulation coil, the first magnet exciting coil and the second magnet exciting coil are used for generating a first magnetic field, and the first magnetic field is at least distributed in a discharge area defined by the discharge channel; the anode is used for attracting electrons emitted by the hollow cathode into a magnetic field of a discharge area for ionization and generating discharge current, and under the condition that the oscillation amplitude of the discharge current is not lower than the target amplitude, the regulation and control coil is used for generating a second magnetic field which is used for adjusting magnetic field distribution in the discharge area. The oscillation amplitude of the discharge current is lower than the target amplitude, and the excitation power supplies of the excitation coil and the regulation coil are different. The Hall thruster has a good low-frequency oscillation suppression effect.

A voltage-to-delay converter includes a first reset transistor having a first terminal coupled to a power supply terminal, a gate terminal receiving a reset signal, and a second terminal coupled to a top plate of a first integrating capacitor, and a second reset transistor having a first terminal coupled to a power supply terminal, a gate terminal receiving the reset signal, and a second terminal coupled to a top plate of a second integrating capacitor. First and second input transistors receive first and second input voltages, and are coupled between the top plate of the first and second integrating capacitors, respectively, and a first current source. A discharge current source is coupled to bottom plates of the first and second integrating capacitors. A pulse generator has first and second inputs coupled to the top plate of the first and second integrating capacitors, respectively.

The invention provides a battery equalization control method and device, electronic equipment and a storage medium, and is applied to a control chip in a battery equalization circuit, the battery equalization circuit further comprises a plurality of equalization thermistors with heating devices underlaid and equalization MOS tubes correspondingly connected with the equalization thermistors, and when a module cell is charged to a preset first voltage threshold value, the equalization thermistors are electrically connected with the equalization MOS tubes. Acquiring a cell voltage corresponding to each string of cells in the module, and determining a voltage difference value between a maximum value and a minimum value corresponding to the cell voltage; when the voltage difference value is greater than a preset first voltage difference threshold value, controlling the equalization MOS tube to be opened, and performing equalization discharging on the battery cell string with the battery cell voltage greater than a preset second voltage threshold value; and controlling a heating device which is connected with the target battery cell string with the maximum battery cell voltage and is padded below the equalization thermistor to work so as to reduce the resistance value of the equalization thermistor and increase the equalization discharge current corresponding to the target battery cell string. The current distribution of the single batteries can be dynamically adjusted by using the adjustable resistor, and efficient equalization is realized.

A motor drive device includes a rectifier unit that rectifies first AC power supplied from a commercial power supply, an inverter that generates second AC power and output the second AC power to a motor, and a control unit that controls the operation of the inverter such that pulsation according to the power state of a capacitor is superimposed on a drive pattern of the motor, to reduce a charge and discharge current of the capacitor. The control unit performs load pulsation compensation control to compensate for load pulsation, power supply pulsation compensation control to reduce the charge and discharge current of the capacitor, and overload compensation control to reduce an inverter input current input to the inverter, while preferentially performing constant current load control to control the rotational speed of the motor.

The invention discloses a high-voltage bidirectional silicon controlled rectifier electrostatic protection device and a manufacturing method. The high-voltage bidirectional silicon controlled rectifier electrostatic protection device comprises a P-type substrate, a P-type well and a high-voltage N well, the emitter P + injection of a parasitic PNP triode and the emitter N + injection of a parasitic NPN triode in the P-type well are arranged alternately, so that the length of a transverse discharge path of the silicon controlled rectifier is reduced to the greatest extent, the square resistance of a PNPN positive feedback conduction path is greatly reduced, and the key problem that a symmetrical bidirectional silicon controlled rectifier structure cannot be effectively opened in a high-voltage window of more than 70V is solved; in addition, the layout can provide an additional parasitic NPN triode path for a silicon controlled rectifier path, the effective area of an emitter of the parasitic NPN triode and the proportion of the emitter in a silicon controlled rectifier loop are increased, and the current discharge capacity of the device is further improved. Therefore, reference can be provided for the structural design of the high-voltage symmetrical bidirectional silicon controlled rectifier electrostatic protection device, and the silicon controlled rectifier can be effectively applied to ESD protection of a high-voltage bidirectional port.

The invention relates to the technical field of lithium ion batteries, in particular to a full-tab cylindrical lithium ion battery and a power utilization device, the full-tab cylindrical lithium ion battery comprises a winding type battery cell, and a positive plate, a diaphragm and a negative plate which are laminated according to a specific mode; the positive plate comprises a positive current collector as well as a positive slurry coating area and a positive empty foil area which are positioned on at least one surface of the positive current collector; the negative plate comprises a negative current collector as well as a negative slurry coating area and a negative empty foil area which are positioned on at least one surface of the negative current collector; after winding, the positive empty foil area and the negative empty foil area respectively form a positive tab and a negative tab through a kneading, cutting and stacking or ultrasonic process; when the battery discharges at 10C, the slope of a curve relation formed by data fitting of the temperature rise coefficient and the discharge current is 0.2-1, the temperature rise performance of the full-tab battery cell is obviously superior to that of a traditional tab battery, more electric quantity can be discharged in a lower temperature interval, and the full-tab battery cell has relatively good safety and relatively high energy density.

The invention discloses a driving circuit, a driving chip and a display device. The driving circuit comprises a current source which comprises a source branch and a plurality of mirror image branches, each mirror image branch comprises a first driving transistor, at least part of the first driving transistors are gated to provide driving current for a load in the output stage of the driving circuit, and a plurality of gate end charging and discharging units are arranged on the source branch and the mirror image branches. Each gate end charging and discharging unit is used for providing gate end charging current or gate end discharging current for the first driving transistor in the corresponding mirror image branch; and the bias unit is used for providing adjustable bias current for the plurality of gate end charging and discharging units so as to adjust the gate voltage rising / falling slope of the first driving transistors in the plurality of mirror image branches. The grid voltage rising / falling slope of the grid end of the first driving transistor in each mirror image branch is adjusted through the adjustable current source and the grid end charging and discharging unit, so that the change rate of the driving current is adjusted, and electromagnetic interference caused by rapid change of the driving current can be avoided.

The invention relates to the technical field of charge and discharge condition detection, in particular to a detection system and method integrating charge and discharge condition data. The method comprises the steps of working condition excitation in a charging mode, calculating target current according to rated capacity of a battery, and charging the battery with the target current until the voltage of the battery is close to cut-off voltage; the cut-off voltage is kept, and the current is gradually reduced to the termination current; in the constant voltage stage, the charging moments are marked through a voltage threshold value, and the electric quantity variable quantity between the moments is calculated; dynamically adjusting charging and discharging current according to battery parameters collected in real time; data acquisition in a discharge mode, including a V2G reverse feed mode and a PTC heating discharge mode; establishing a mapping relation between the electric quantity variation and the SOH; establishing a battery state space model, and fusing voltage, current and temperature data to estimate the SOC and SOH of the battery; a three-layer BP neural network is constructed, and the weight and bias are optimized through a sample data training model. According to the technical scheme, the charging and discharging condition data detection efficiency and accuracy can be improved.