3321 results about "Constant voltage" patented technology

The invention relates to the technical field of battery management, and discloses an equalizing charging method, device and equipment for a power battery pack. The method comprises the following steps: performing parameter acquisition on a power battery pack, measuring terminal voltage values, temperature values and charge and discharge current values of each single battery, and calculating a state-of-charge value and an internal resistance change rate of each single battery; inputting into a multi-head self-attention network for feature extraction, and generating a state correlation feature matrix; constructing an Actor network and a Critic network based on the state correlation characteristic matrix, and outputting an equalization current value, a constant-current or constant-voltage equalization mode and equalization time through the Actor network; according to the equalization current value, the equalization mode and the equalization time, the DC-DC converter in the main equalization loop is controlled to generate constant current output, or the Buck-Boost converter in the secondary equalization loop is controlled to generate constant voltage output, the equalization efficiency of the power battery pack is guaranteed, meanwhile, energy loss is reduced, and temperature self-adaptive control over the equalization circuit is achieved.

The invention provides a lithium ion battery health state evaluation method and system, and the method comprises the steps: obtaining tangent slopes of different voltage points in a lithium ion battery IC curve, voltage values corresponding to extreme points, constant-current charging and discharging current features and constant-voltage charging voltage features, and taking the features as key features of a to-be-detected lithium ion battery; carrying out correlation calculation by adopting a Pearson's correlation coefficient, a Spearman level correlation coefficient and a maximum information coefficient to obtain a final health assessment factor for assessment; the extracted key features can effectively reflect the health state degradation performance of the battery, and the feature noise can be effectively reduced by adopting three different correlation methods for screening, so that the accuracy of later evaluation is improved.

The invention provides a remote control method and system for an intelligent constant-voltage dimming power supply, and the method comprises the steps: obtaining historical working data, environment data and power supply attribute data of a plurality of dimming power supplies through a server, and generating a plurality of control strategy models according to the historical working data, the environment data and the power supply attribute data; sending the model to a remote control terminal; the remote control terminal generates a control instruction according to the control strategy model and sends the instruction to the power supply controller; the power supply controller adjusts working parameters of the dimming power supply according to the instruction; monitoring the working state of the dimming power supply in real time, acquiring working monitoring data, and transmitting the working monitoring data to the remote control terminal; and the remote control terminal generates a new control instruction and sends the new control instruction to the power supply controller in combination with the working monitoring data and a preset dimming curve, and the power supply controller adjusts working parameters of the dimming power supply according to the new instruction. According to the scheme of the invention, through an intelligent control strategy and a dynamic adjustment mechanism, efficient, energy-saving and safe remote dimming control can be realized, and the user experience and the reliability of equipment are improved.

The invention discloses a charging pile output power control method, and particularly relates to the technical field of charging pile management, and the method comprises the following steps: collecting the real-time operation information of a charging station, analyzing the overall load fluctuation condition, and judging whether an early sign that the operation fluctuation intensity is too high exists or not; and if abnormity is identified, further collecting operation information of each charging pile, extracting feature data, and performing stability and adaptability evaluation. And an evaluation result is imported into a fuzzy reasoning model, and the charging pile is divided into a high-quality operation state and a low-quality operation state. In a single abnormal scene, the charging piles in a high-quality operation state maintain a constant-current and constant-voltage strategy, and the charging piles in a low-quality operation state are switched to an adaptive power adjustment strategy; in an overall abnormal scene, all the charging piles are switched to an adaptive power adjustment strategy, so that the operation efficiency and stability are improved; the strategy can be dynamically adjusted according to different operation scenes, and the requirements under different operation conditions are met.

The invention provides a battery formation method and device, a battery and a production method, system and device of the battery, and belongs to the technical field of batteries. A first target film forming voltage is determined by characterizing a differential voltage-voltage change curve of an organic phase film forming reaction of the solid electrolyte interfacial film. In the battery formation method, the first target film forming voltage determined by the differential voltage-voltage change curve is used for constant-voltage charging, so that the film forming quality of the solid electrolyte interfacial film can be improved.

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 discloses a power supply method and a power supply system for on-line monitoring equipment of a lightning arrester, and the method specifically comprises the steps: activating a multi-source energy module according to a preset priority order based on the operation state and environment parameters of the lightning arrester, and supplying power to the on-line monitoring equipment; based on the output characteristics of the multi-source energy module and the residual electric quantity of the on-line monitoring equipment, a constant voltage-constant current hybrid power supply strategy in a conventional mode or an anti-interference power supply strategy in an abnormal mode is executed on the on-line monitoring equipment; and processing the historical leakage current, environmental temperature and humidity and vibration spectrum characteristics of the lightning arrester acquired by the online monitoring equipment through the LSTM prediction model, predicting the energy supply trend of the online monitoring equipment in the preset future time, and dynamically adjusting the working parameters of the online monitoring equipment according to the energy supply trend. According to the invention, stable power supply of the lightning arrester on-line monitoring equipment in a complex environment is realized, and the power supply reliability and the equipment availability are improved.

The invention discloses an optimized reactive power control and fault ride-through method and system for a hybrid commutation converter, and the method comprises the steps: introducing reactive power control and considering the constant voltage control of negative turn-off angle limitation, achieving the control of an extremely low turn-off angle through the active turn-off of a full-control device in the converter under a steady-state working condition, and further meeting the demands of a high power factor; the investment of passive filter equipment is reduced; under the alternating current fault working condition, forced commutation and negative turn-off angle operation are achieved through active turn-off of a full-control device, the receiving end power grid voltage is effectively supported while commutation failure of a half-control thyristor in the hybrid commutation converter is avoided, and the active power transmission level during the fault period is improved. The full-control characteristic of the reverse blocking type integrated gate commutation thyristor in the hybrid commutation converter is fully utilized, reactive power control under the steady-state working condition and stable power transmission under the alternating-current fault are achieved by optimizing active turn-off control, and the method has wide applicability and good application prospects.

The invention discloses an electric energy bidirectional multipath AC / DC conversion circuit, and relates to the technical field of electric energy conversion, and the circuit comprises a power supply multipath power distribution module which is used for inversion filtering, multipath power distribution and electric energy complementary superposition processing; the intelligent control module is used for signal receiving and module control; the first adjusting module is used for constant-voltage adjustment, constant-current adjustment and residual electric energy superposition control and supplying power to the first output module; the second adjusting module is used for constant-voltage adjustment, constant-current adjustment and residual electric energy superposition control and supplying power to the second output module; the energy storage control module is used for storing residual electric energy and supplying power; and the compensation control module is used for boosting and providing electric energy for the first adjusting module or the second adjusting module. According to the electric energy bidirectional multipath AC / DC conversion circuit, multipath power distribution processing can be carried out, constant current or constant voltage adjustment processing can be carried out according to needs, the superposed residual electric energy is stored and is supplied to the first adjustment module or the second adjustment module, the utilization rate of the electric energy is improved, and a wider voltage range can be provided.

The invention discloses a lithium battery SOH estimation method based on knowledge distillation, and the method comprises the steps: collecting voltage data in a constant-current charging stage and current data in a constant-voltage charging stage, and carrying out the preprocessing of the data, and then forming a data set; building a teacher-student knowledge distillation model, wherein the model comprises a local feature extraction module, a time sequence degradation memory module and a global interaction module; a distillation method of each module is designed, a local feature extraction module adopts layer attention distillation, a time sequence degeneration memory module adopts time sequence attention distillation, and a global interaction module adopts feature alignment distillation; through knowledge distillation, lithium battery degradation characteristics extracted by the teacher model are migrated to the student model, and a lightweight SOH estimation model is obtained; and estimating SOH on line by using the lightweight SOH estimation model. According to the method, a knowledge distillation framework is built, knowledge is transferred from a complex teacher model to a light student model, and the number of model parameters is remarkably reduced while high-precision estimation of the SOH of the lithium battery is achieved.

The invention provides a battery health state evaluation method and system, a storage medium and a computer. The evaluation method comprises the following steps: acquiring basic data of a battery during a mixed pulse test; constructing a battery model, performing parameter fitting on the battery model according to the basic data, and obtaining parameter values of each element in the battery model after parameter fitting; performing constant current-constant voltage charging and discharging simulation on the fitted battery model, acquiring SOC data of the battery model in the charging and discharging simulation process, and acquiring SOH data according to the element parameter values; taking the voltage, current, temperature and SOC data of the battery model in the charge and discharge simulation process as the input of the convolutional neural network, and taking the SOH data as the output to train the convolutional neural network; and taking the trained convolutional neural network as an evaluation model of the battery, and evaluating the health state of the battery according to the evaluation model. The battery health state evaluation method provided by the invention is high in adaptability and high in accuracy.

The invention provides an intrinsic solid-state ion diffusion coefficient test method and device based on optical imaging, and relates to the technical field of solid-state ion test.The method comprises the steps that a test sample is pretreated; carrying out a photoelectric test on the test sample; placing the electrochemical cell in an optical imaging system, connecting the electrochemical cell with an electrical testing system, applying a constant voltage deviating from a steady state to the monodisperse electrode plate, collecting the real-time change condition of the material under the modulation of the constant voltage in real time through an industrial camera, and outputting relational data of optical intensity and time; analyzing the diffusion path through in-situ characterization equipment, and obtaining an ion diffusion path corresponding to the to-be-detected ion battery electrode material particles in combination with dynamic information provided by an optical imaging system; and determining the characteristic time according to the relational data of the optical intensity and the time, and determining the intrinsic solid ion diffusion coefficient corresponding to the test sample by combining the characteristic time and the ion diffusion path corresponding to the to-be-tested ion battery electrode material particles.

The invention provides a multi-scale self-adaptive cooperative network construction type energy storage frequency modulation control system and method, and the system comprises a constant-voltage energy storage power supply which is used for providing DC electric energy; the three-phase inverter circuit is used for converting the direct-current electric energy into alternating-current electric energy and outputting the alternating-current electric energy to a power grid or absorbing the electric energy; the power calculator is used for calculating active power and reactive power output to the power grid by the three-phase inverter circuit; the battery SOH dynamic evaluation controller is used for outputting an SOH attenuation rate signal; the active loop controller is used for generating multi-scale adaptive frequency modulation data and sending the multi-scale adaptive frequency modulation data to the pulse adjustment controller; the reactive power ring controller is used for generating reactive power regulation data according to the power grid voltage deviation signal and sending the reactive power regulation data to the pulse regulation controller; and the pulse regulation controller is used for outputting a final pulse regulation instruction and a multi-scale cooperative control command to the three-phase inverter circuit. The oscillation risk is reduced, and long-term stable operation of the power system is guaranteed.

The invention provides a constant-voltage PWM dimming system for improving the brightness change of a light source, and the system comprises a controller, and a PWM wave generation module in the controller controls the light source to be turned on based on a set duty ratio. The current acquisition module controls and acquires actually measured current; the temperature acquisition module acquires real-time temperature, and the current mapping module calculates theoretical current according to a linear mapping function of the temperature and the current; the current compensation module obtains compensation current; the duty ratio mapping module obtains a theoretical duty ratio corresponding to the compensation current by using a linear mapping function of the current and the duty ratio; the duty ratio adjusting module compares the theoretical duty ratio with the duty ratio set by the current PWM wave generation module, resets the duty ratio, outputs a PWM control signal according to the newly set duty ratio, and controls the light source to be lightened; according to the system, a feedback adjustment mechanism is established, so that the brightness of a light source is dynamically balanced in an interval, and obvious change of a brightness value is avoided; the method is suitable for accurate dimming control of various types of LED light sources.

The invention relates to the technical field of storage battery charging, in particular to a multi-stage power storage battery charging control method and system based on intelligent dynamic adjustment. According to the invention, the pre-charging current is determined through the battery health state value and the initial SOC of each single battery, so that the single batteries are pre-charged through the pre-charging current which is individually designed, and after the pre-charging stage is finished, the constant-current charging current is determined according to the first SOC so as to carry out constant-current charging. The constant-current charging current is made to be matched with the current state of each single battery, then a second SOC of each single battery after constant-current charging is finished is obtained, after it is indicated that the single battery is charged to be close to the full-charge state through the second SOC, a constant-voltage charging voltage is obtained for the second SOC of the single battery to conduct constant-voltage charging, and meanwhile electric quantity transferring is conducted on the single battery; finally, whether the electric quantity of the battery pack is balanced or not is judged, and if the electric quantity is not balanced, the SOC difference between the single batteries is gradually eliminated by continuously optimizing the charging process.

The invention discloses a harmonic suppression method for a network construction type optical storage converter, and belongs to the technical field of new energy. According to the method, the operation of the photovoltaic inverter is adjusted through a constant voltage control strategy, remarkable advantages are shown, the energy loss is effectively reduced by inhibiting the photovoltaic inter-harmonics, and the operation stability of the system is improved. The photovoltaic power fluctuation can be obviously reduced, the energy storage control cost is effectively reduced, and the service life of energy storage equipment is prolonged. Meanwhile, the grid-connected performance is excellent, the distortion rate of grid-connected voltage and current can be reduced, and the electric energy grid-connected quality is improved. In addition, a network construction control method is introduced into the system, the network voltage can be effectively supported, the network frequency can be flexibly adjusted, and the adaptability and supporting capacity of the system to network operation are enhanced. According to the invention, stable operation requirements in different grid-connected environments can be met. The method has important technical innovation in the aspects of improving the operation efficiency, the reliability and the system coordination, and has extremely high application and popularization values.

The invention discloses a coordination control method for energy storage and a flexible multi-state switch in a power distribution network system, and relates to the field of power supply and distribution. The hierarchical control mode is adopted to coordinate the energy storage system and the flexible multi-state switch; the coordination control layer performs working mode selection and switching in a networking operation mode by a centralized controller according to the feeder load power, the charge state of a storage battery, the operation state of each transformer and the position and the number of feeder faults; the control strategy of the flexible multi-state switch can be changed among a constant DC voltage control strategy, a constant power control strategy and a droop control strategy; the control strategy of the storage battery can be switched among constant-current charging control, floating charging control and constant-voltage control; and the feeder load in the equipment control layer can also realize a load switching control strategy. By adopting the coordination control method, the power supply reliability and the power quality of the system can be improved.

The present invention discloses a direct-current side voltage reference value setting method and apparatus, a storage medium, and a device. During low-voltage ride-through, direct-current side operation characteristics under different power grid voltage drop conditions are carefully considered. On the basis of different power grid voltage drop conditions, a corresponding strategy is executed to reduce a direct-current voltage reference value, so that a high modulation factor can be maintained during an entire low-voltage ride-through process, switching loss of a grid-forming converter can be reduced, and output waveform quality can be improved. During high-voltage ride-through, because constant-voltage control is adopted, the grid-forming converter may lose balance points. Therefore, according to differences in power grid voltage rise amplitude, the present invention divides a direct-current side reference value setting algorithm into three conditions, and provides an algorithm for maintaining a minimum active current required to stabilize a bus voltage of the direct-current side, so as to ensure that direct-current voltage remains controllable during the entire ride-through process.

The present invention discloses a formation method for a sodium-ion single battery, which includes constant current charging of the sodium-ion single battery at a charging rate of 0.1C - 0.5C under the condition of 20 - 25°C, and the charging cut-off voltage is V C1 and standing still for 30 - 60 minutes, placing the single battery under the condition of 2 - 10°C for 1 - 2 h, and using voltage V C2 to perform constant voltage charging for 2 - 5 seconds and then standing still for 3 - 8 seconds, standing still for 30 - 60 minutes under the condition of 20 - 25°C, and performing constant current discharging of the sodium-ion single battery at a discharging rate of 0.1C - 0.5C, and the discharging cut-off voltage is V D1、 placing the single battery under the condition of 35 - 55°C for 1 - 2 h, and using voltage V D2 to perform constant voltage discharging for 3 - 6 seconds and standing still for 5 - 8 seconds. The formation method of the sodium-ion single battery significantly changes the performance of the sodium-ion battery, effectively improving the first capacity, charge and discharge efficiency, and cycle life of the sodium-ion battery.

The invention provides a hovering type wireless charging control method for an electric power inspection unmanned aerial vehicle, and belongs to the technical field of unmanned aerial vehicles. According to the technical scheme, firstly, modeling is conducted on a multi-transmitting-stage magnetic coupling type wireless electric energy transmission system, then directional constant-voltage output parameters of a wireless charging system in a coil offset state are determined, and control parameters of the wireless electric energy transmission system of the unmanned aerial vehicle are determined; on the basis, modeling is carried out for unmanned aerial vehicle power inspection power consumption and the charge state, and multi-source disturbance suppression parameters of the unmanned aerial vehicle and attitude track full-time-domain preset time control parameters of the unmanned aerial vehicle are determined. According to the method, a multi-transmitting-stage MCR-WPT system is adopted, a directional constant voltage output model is constructed, meanwhile, a charging system control strategy is optimized, and a wireless charging scheme based on an LCC-S type compensation network is designed. According to the invention, the transmission efficiency and stability of the wireless charging system of the electric power inspection unmanned aerial vehicle are improved, and the hovering wireless charging control precision of the electric power inspection unmanned aerial vehicle is improved.

The invention discloses a battery lithium precipitation detection method and device, electronic equipment and a storage medium. The battery lithium precipitation detection method comprises the following steps: acquiring current change data of a to-be-detected battery in a constant-voltage charging stage along with time change; performing first-order differential processing on the current change data to obtain a dI / dt-t curve of the battery to be detected; according to a target time period formed by time points corresponding to all inflection points in the dI / dt-t curve, target current change data in the target time period in the current change data are determined, and the reversible lithium precipitation amount of the to-be-measured battery is obtained according to the target current change data. The battery lithium precipitation detection method provided by the embodiment of the invention can quantitatively analyze the lithium precipitation degree of the battery.

The invention relates to the technical field of lithium battery charging under photovoltaic panel power supply, in particular to a Buck-Boost lithium battery intelligent charging method based on ML-MPPT and dynamic reference voltage regulation, and the method comprises the steps: dividing a charging stage into a trickle charging stage, a constant-current charging stage and a constant-voltage charging stage according to the voltage of a lithium battery; the method comprises the following steps: acquiring environment temperature, solar illuminance and maximum power point voltage data in a constant current stage, preprocessing the data, training a maximum power point voltage prediction machine learning model, distilling the model to obtain a compression model, and deploying the compression model on a microcontroller; real-time environment data is input into the model to predict and obtain the maximum power point voltage as the reference voltage, the output voltage of the photovoltaic panel is sampled, and the input voltage of the Buck-Boost circuit is controlled by using the innovative PWM control system, that is, the duty ratio of PWM pulses is controlled through the microcontroller, the input impedance of the Buck-Boost circuit is adjusted, and the output voltage of the Buck-Boost circuit is adjusted. The output voltage of the photovoltaic panel, namely the input voltage of the switching power supply, is adjusted to the maximum power point voltage according to environmental conditions; and dynamically switching the lithium battery in different charging stages according to the battery state and the input power. The method integrates machine learning into prediction of the maximum power point voltage, and is suitable for an intelligent charging scene of the lithium battery under photovoltaic power supply.

The invention discloses a power battery health degree online evaluation method and system based on a charging curve, and the method comprises the steps: dynamically dividing a characteristic interval of a constant-current charging stage and a constant-voltage charging stage through monitoring the voltage and current data in a charging process in real time; extracting time domain and frequency domain characteristic parameters in the characteristic interval; inputting the time domain and frequency domain characteristic parameters into a health degree evaluation model subjected to transfer learning optimization, and generating a fusion health degree index at least comprising a battery capacity attenuation coefficient and an internal resistance change vector; and outputting a final health degree evaluation result and residual service life prediction through an adaptive weighting algorithm based on the fused health degree index in combination with historical cycle data and operating environment parameters of the battery. According to the embodiment of the invention, high-precision and non-intrusive online evaluation and life prediction of the health degree of the battery can be realized, and the real-time performance, accuracy and engineering applicability of evaluation are improved.

The invention provides a constant-current and constant-voltage battery charging system for a lightweight underwater vehicle, and belongs to the technical field of underwater wireless charging. The system comprises a power supply control module, an inverter module, a primary side topology module and a secondary side topology module. According to the invention, the switching circuit of the S-S topology and the LCC-S topology is designed at the primary side, so that the constant current-constant voltage dual-mode switching of underwater wireless charging and the high efficiency of underwater wireless charging in a wide load range are realized.

The present invention relates to a method for activating a lithium secondary battery, which comprises: a cathode comprising a cathode active material of a lithium metal oxide that comprises manganese in an amount greater than or equal to 50 mol% and less than 100 mol% on the basis of the total amount of metals excluding lithium; an anode; and an electrolyte, the method comprising a step of activating a lithium secondary battery through CC-CV charging in which constant current (CC) charging is performed until a determined state of charge (SOC) (%) is reached, and then constant voltage (CV) charging is performed, and terminating, when the depth of activation charge defined by the following relation 1 becomes 5.17-15.00%, CC-CV charging of the activation step. [Relation 1] Depth of activation charge (%) = (charge capacity of CV charging section / total charge capacity of activation step) * 100

Methods and systems are disclosed herein for charging a battery. Charging the battery includes altering charging of a battery when a charge current reaches a current cutoff value. The current cutoff value is based on an energy throughput of the battery. Altering charging may include terminating charge of the battery. The energy throughput of the battery may include charging and / or discharging. The current cutoff value may also be based on heat flux through the battery, where heat flux through the battery is determined using temperature measurements. The battery charging may include a constant current / constant voltage (CCCV) signal and / or a shaped charging signal.

The present invention discloses a method for fast charging of lithium-ion batteries. During the charging process of the lithium-ion battery, the lithium-ion battery is charged in stages to an upper limit voltage using a constant current charging method, and then charged to a final current using a constant current constant voltage charging method to complete the charging. In the constant current charging stage, the constant current charging rate of the latter stage is lower than the constant current charging rate of the previous stage, and the voltage reached by the constant current charging in the latter stage is higher than the voltage reached by the constant current charging in the previous stage, thereby improving the service life of the battery in a staged manner. In particular, the current rate and the voltage reached, as well as the final current, used in each stage of the battery charging are quickly determined in combination with a non-destructive lithium plating detection method, thereby greatly shortening the battery charging time while ensuring that lithium plating does not occur in the battery.

The invention discloses a lithium battery SOH (state of health) estimation method based on pre-training fused multi-source data. The method comprises the following steps: acquiring constant-voltage charging current data and electrochemical impedance spectroscopy data; preprocessing the data and forming a data set; constructing a pre-training task 1, outputting two features through an encoder 1 and an encoder 2, and constructing a loss function loss1 of the task 1 according to cosine similarity between feature fragments; constructing a pre-training task 2, randomly masking segments of two features, outputting fusion features through an encoder 3, constructing two decoder reconstruction mask segments to obtain reconstruction loss loss2 and loss3, and weighting based on correlation to obtain a loss function loss4 of the task 2; the encoder is frozen to form an SOH estimation model with an estimator; and estimating the SOH on line. According to the invention, the encoder can fully fuse two kinds of data aging information through the two pre-training tasks, and the SOH of the lithium battery is accurately estimated.

The invention discloses a method for preparing antioxidant MXene through electrochemical stripping, and belongs to the technical field of two-dimensional nano materials. Comprising the following steps: (1) centrifuging a Ti < 3 > C < 2 > T < x > MXene dispersion liquid to obtain a MXene wet solid, and coating the MXene wet solid on two sides of a copper foil; (2) the copper foil coated with the MXene wet solid serves as a cathode, and the cathode and the anode are placed in an electrolytic tank together; and (3) applying a constant voltage for electrolysis, collecting sediments in an electrolytic tank, centrifuging, washing, carrying out suction filtration, and drying to obtain the e-MXene film. The e-MXene prepared by the invention has excellent oxidation resistance and adjustable infrared emissivity, and can adapt to infrared camouflage application under damp and hot conditions.

The invention relates to the technical field of charging, and particularly discloses a method for dynamically optimizing the full charge capacity of a lithium battery in an unbalanced state. Dynamically adjusting the standing duration according to the average temperature and the cycle index of the current battery pack, standing to eliminate the polarization effect, and obtaining stable open-circuit voltage of each monomer; inquiring a pre-established open-circuit voltage-state-of-charge characteristic table based on the obtained minimum monomer voltage to obtain the state of charge of the minimum-capacity monomer; generating a segmentation correction formula based on a segmentation threshold value and a gain coefficient dynamically determined by utilizing a large number of full charge capacity correction examples; updating the full-charge capacity by adopting a segmented correction formula and the charge state of the minimum-capacity monomer to obtain a full-charge capacity dynamic optimization result; the accuracy of full charge capacity calculation is effectively improved, the real full charge capacity of the lithium battery in an unbalanced state is better reflected, the service life of the battery is prolonged, and the use efficiency of the battery is improved.