429 results about "Capacity loss" patented technology

The invention relates to the technical field of energy scheduling, and discloses a smart city energy dynamic scheduling system and method based on big data analysis, and the method comprises the following steps: the operation state of a transformer substation, the basic parameters of a charging pile and regional load prediction data are collected in real time, data cleaning and abnormal value filtering are carried out; constructing a complete power grid-charging facility dynamic information base; calculating the power supply margin of each region based on the capacity loss of the faulty transformer substation, establishing a weight scoring system of charging pile power adjustment in combination with the charging demand urgency, and determining the reduction or recovery priority of each charging load; and generating a charging pile power adjustment instruction through a multi-target optimization model, and iteratively correcting a power distribution scheme and generating a final scheduling instruction set by taking minimization of user satisfaction loss as a target while meeting the power grid capacity. According to the invention, by constructing a dynamic response mechanism and a multi-target collaborative optimization model, accurate and rapid regulation and control of the traffic load are realized in the scene of sudden power shortage of the power grid.

The invention discloses a battery safety risk grade early warning and evaluation method, and relates to the technical field of lithium ion batteries, and the method comprises the steps: collecting battery operation data, carrying out the processing to obtain a capacity attenuation characteristic and an internal resistance growth characteristic, and obtaining a degradation characteristic parameter related to the temperature through an Arrhenius model; estimating capacity loss trends at different temperatures and time; inputting the multi-source time sequence data into a long short-term memory network, and predicting the capacity and internal resistance change of a plurality of cycles in the future; and in combination with a life end criterion, calculating the remaining service life, fusing the remaining service life with the degradation index of the aging model and the degradation index of the capacity model, generating a safety state index, and outputting a battery safety risk grade and corresponding early warning information. According to the invention, overall safety risk assessment can be provided for the whole battery system, accurate monitoring and early warning can be carried out on the single batteries or local modules, and the safety and reliability of battery operation can be improved.

Understanding a health status and expected remaining lifetime of an EV (electric vehicle) battery is important before repurposing the battery for second life applications. A device for connecting to an unopened EV battery pack via operable coupling to signal and power wiring is disclosed. The device enables access to diagnostic information from the unopened EV battery. The device measures cell and / or module voltages and currents within the battery pack for several different depths of discharge. A self-learning algorithm implemented by the diagnostic device, which uses historical data and diagnostic information from the battery pack, determines a condition of the battery and provide recommended operational conditions for future use of the battery. For example, a degradation slope and expected capacity loss over time can be determined based on measured variations of cell and / or modular voltages and subsequently used, with cell impedance data, to recommend an operational C-rate for the battery pack.

Understanding a health status and expected remaining lifetime of an EV (electric vehicle) battery is important before repurposing the battery for second life applications. A device for connecting to an unopened EV battery pack via operable coupling to signal and power wiring is disclosed. The device enables access to diagnostic information from the unopened EV battery. The device measures cell and / or module voltages and currents within the battery pack for several different depths of discharge. A self-learning algorithm implemented by the diagnostic device, which uses historical data and diagnostic information from the battery pack, determines a condition of the battery and provide recommended operational conditions for future use of the battery. For example, a degradation slope and expected capacity loss over time can be determined based on measured variations of cell and / or modular voltages and subsequently used, with cell impedance data, to recommend an operational C-rate for the battery pack.

The invention provides a capacitor optimization switching method and system based on time sequence control, and relates to the technical field of circuit protection, and the method comprises the steps: building a health state database of a capacitor bank, constructing a residual life prediction model of the capacitor bank through employing a deep learning algorithm, and building a backup protection strategy of a standby capacitor bank; monitoring the voltage fluctuation rate and the capacitance loss rate of the main working capacitor bank to generate a health state evaluation report of the main working capacitor bank, and establishing a load prediction model in combination with the real-time working parameters of the duplex capacitor bank; when the state of the main working capacitor bank is abnormal, after the standby capacitor bank meets the switching condition, the optimal switching opportunity is determined, and the soft switching technology is adopted to realize undisturbed switching; optimizing the switching opportunity based on the updated historical data of the health state database and the calculation result of the residual life prediction model; when the residual life prediction model predicts that the residual life of any capacitor bank is lower than a preset threshold value, an early warning signal is triggered, and replacement is prompted.

The invention belongs to the technical field of sodium-ion battery electrolyte, and particularly discloses negative-electrode-free sodium metal battery electrolyte as well as a preparation method and application thereof. The negative-electrode-free sodium metal battery electrolyte comprises an organic solvent, sodium salt and a sodium supplementing additive; the sodium supplementing additive comprises at least one of sodium trimethylsilanolate and sodium amide. According to the electrolyte disclosed by the invention, through reasonable configuration, a compact solid electrolyte interface film (SEI film) is formed on an electrode-electrolyte interface of the negative-electrode-free sodium metal battery, so that irreversible loss of active sodium in an SEI forming stage is effectively compensated, reversible capacity loss in a circulating process is reduced, and the circulating stability and safety of the battery are improved.

The invention provides tab glue, a negative plate and a lithium ion battery, the tab glue is an emulsion, the surface tension of the emulsion is 45-60 mN / m, and the viscosity of the emulsion is more than 2000 mPa.s. The tab glue is favorable for reducing the capacity loss of the lithium ion battery.

A modified current collector for a secondary battery is disclosed herein, comprising a substrate and a conductive layer applied on one side or both sides of the substrate, wherein the conductive layer comprises a conductive material, a binder material comprising a polymer, and a metal compound, and may additionally comprise a particulate material. Also provided herein is a cathode for a secondary battery, comprising the modified current collector and an electrode layer, wherein the electrode layer is located on the surface of the conductive layer. The presence of the conductive layer inhibits corrosion of the substrate and reduces interfacial resistance between the electrode layer and the substrate. In addition, the metal compound in the conductive layer reduces irreversible capacity loss due to SEI formation during initial charging of the battery. Consequently, batteries comprising the modified current collector exhibit exceptional electrochemical performance.

The invention discloses a battery capacity loss real-time prediction method based on Arrhenius-LSTM, and the method comprises the steps: S1, collecting the current, voltage, state of charge and temperature data of a vehicle-mounted battery management system, and generating an original time series data set; s2, performing time alignment and capacity calculation on the original time sequence data set to generate a capacity loss sequence; s3, an Arrhenius Arrhenius model is constructed based on the capacity loss sequence, and a physical baseline prediction sequence is generated through temperature related parameter estimation; s4, calculating a difference value between the capacity loss sequence and the physical baseline prediction sequence, and generating a residual sequence; s5, performing feature extraction and time sequence window construction on the residual error sequence to generate an LSTM training data set; s6, inputting the LSTM training data set into the long short-term memory network for training, and generating a residual prediction model; and S7, adding the physical baseline prediction sequence and the output of the residual prediction model to generate a capacity loss prediction result. And the online monitoring and early warning functions of the health state of the battery are realized.

The invention relates to the technical field of battery recycling, and discloses a sorting method, system and equipment for retired lithium ion batteries and a medium. The sorting method comprises the steps that use data of the retired lithium ion batteries in the service period are obtained; obtaining a capacity loss curve used for representing the capacity loss rate of the retired lithium ion battery in the service period and a capacity increment curve used for representing the internal aging mechanism of the retired lithium ion battery in the service period; inputting the capacity increment curve of the decommissioned lithium ion battery and a nonlinear loss area in the capacity loss curve into the trained LSTM model, predicting to obtain a future capacity attenuation path of the decommissioned lithium ion battery, and identifying a sudden change point of the capacity attenuation rate of the decommissioned lithium ion battery from the capacity attenuation path; and according to the residual capacity of the decommissioned lithium ion battery and the abrupt change point of the capacity fading rate of the decommissioned lithium ion battery, evaluating the secondary service potential of the decommissioned lithium ion battery so as to complete the sorting of the decommissioned lithium ion battery.

The invention provides a lithium battery self-adaptive charging method and system, and relates to the technical field of lithium battery charging, and the method comprises the steps: building a state-of-charge equation describing the change of the electric quantity of a lithium battery along with the charging current; calculating the positive electrode current density and the negative electrode current density of the lithium battery under the charging current; determining the internal charging voltage of the lithium battery under the charging current by using a BV kinetic equation in combination with the positive electrode current density and the negative electrode current density; determining an SEI layer overpotential associated with the SEI layer generation rate; calculating SEI layer generation current related to the charging current according to the SEI layer overpotential; establishing a relation function between the SEI layer generation current and the capacity loss of the lithium battery; establishing a charging current linear attenuation equation; establishing a charging current optimization equation, and solving an expected charging current; and charging the lithium battery. And while the charging efficiency is not reduced, the excessive generation of an SEI layer in the charging process is reduced, and the service life of the lithium battery is prolonged.

The invention provides a motor controller heating system, a control method thereof and a vehicle, and relates to the technical field of vehicle control, and the method comprises the steps: controlling the conduction states of a first switch module, a second switch module, a third switch module and an inverter, the energy storage element, the inverter, the two-phase winding in the three-phase motor and the power battery are connected in sequence to form a charging and discharging loop of the power battery; obtaining a target current and a target voltage of the power battery, a phase current of a first phase winding in the three-phase motor and a current voltage of the power battery; according to the target current, the target voltage, the current voltage and the phase current, the duty ratio of a control pulse of a first phase bridge arm in an inverter connected with the first phase winding is obtained, the first phase bridge arm is controlled according to the duty ratio so as to adjust the current of a charging and discharging loop, mutual charging and discharging between a power battery and an energy storage element can be achieved, and the charging and discharging efficiency is improved. The heating capacity of the power battery is improved, the capacity loss is reduced, and the current can be accurately controlled.

The invention provides a battery prediction and early warning method and device, and the method can obtain an actually measured expansive force curve of a lithium iron phosphate battery in a charging process, and respectively determines a maximum expansive force value of the actually measured expansive force curve at SOC = about 30% and a maximum expansive force value of the actually measured expansive force curve at SOC = about 100%. And carrying out capacity loss prediction and / or sharp degradation judgment on the lithium iron phosphate battery according to the actual pressure difference between the two expansive forces and a pre-constructed capacity loss model. Therefore, capacity loss prediction and / or rapid degradation early warning can be realized by using the size relationship between the two expansion force peak values and the pressure difference in the charging process based on the charging and discharging platform characteristics of the lithium iron phosphate battery, so that the accuracy of prediction and early warning can be improved.

The invention relates to a preparation method of a silicon-carbon negative electrode material based on organic matter pyrolysis modified porous carbon, and the preparation method comprises the following steps: S1, carrying out activation pore-forming on a carbon raw material to obtain a porous carbon material; s2, placing the porous carbon material in an inert atmosphere, and performing high-temperature pretreatment; s3, performing pyrolysis modification on the pretreated porous carbon material in the presence of small organic molecule steam; s4, carrying out silicon vapor deposition on the modified porous carbon through silane gas to obtain a silicon-carbon precursor; and S5, coating the surface of the silicon-carbon precursor with carbon-containing gas at a high temperature to obtain the product silicon-carbon negative electrode material. Porous carbon is modified, ultramicropores are filled and defects in a pore wall carbon layer are repaired through pyrolysis of the small-molecular organic matter, a compact carbon layer structure is formed on the surface of the pore wall, the conductivity and mechanical strength of the material are improved, and irreversible capacity loss is reduced.

The invention discloses a sodium-ion battery negative pole piece, a preparation method, a sodium-ion battery and an electric device, the negative pole piece has a layered structure, that is, the negative pole piece comprises a first active layer and a second active layer, and the average interlayer spacing and gram volume of active substance materials in the two active layers meet a certain relational expression. Through the layered design of the pole piece and the specific matching of the active material in the active layer, the sodium-ion battery can give consideration to high gram volume and dynamic performance, the gram volume loss is small, and the dynamic performance is high, so that the comprehensive performance optimization of the sodium-ion battery is realized.

The invention provides an energy storage battery production line process intelligent detection method and system, and relates to the technical field of energy storage battery production detection. Collecting AC impedance and temperature data to generate a performance distribution diagram; performing charging identification on an abnormal area and determining a defect type; carrying out pulse discharge test on the abnormal region to calculate a capacity loss rate; and marking unqualified products according to the capacity loss rate and adjusting process parameters. The method can accurately identify the performance defect of the battery monomer, improve the detection precision and the production efficiency, and effectively reduce the defective product rate.

The invention relates to a battery charging and discharging control method and device, a battery management system and electronic equipment, and the control method comprises the steps that current information of a target battery of a vehicle is obtained, and the current information of the target battery comprises the current temperature of the target battery, the current power consumption of the target battery and the current capacity loss rate of the target battery; determining a first charging and discharging interval of the target battery based on the current temperature of the target battery, the current power consumption of the target battery and the current capacity loss rate of the target battery; and controlling charging and discharging of the target battery based on the first charging and discharging section. According to the method, the SOC of the target battery is controlled within the charging and discharging interval determined by the temperature, the power consumption and the capacity loss rate, so that the rationality, the flexibility and the intelligent degree of charging and discharging interval regulation and control are improved, meanwhile, the service life of the battery is greatly prolonged under different temperature conditions, and the charging and discharging efficiency is improved. And moreover, the safety risk is reduced, the uniformity of capacity distribution is improved, and the resource utilization rate is improved.

The invention belongs to the technical field of batteries, and particularly relates to a sodium ion battery monomer, a positive pole piece, a preparation method thereof and a related device. The sodium ion battery monomer comprises a positive pole piece, the positive pole piece comprises a positive active material and a solid electrolyte interface film at least combined on the surface of the positive active material, and the solid electrolyte interface film comprises one or more cations of Na < + >, Li < + >, K < + > and Ca < 2 + >. The solid electrolyte interface film combined on the surface of the positive electrode active material contains cations such as Na < + >, Li < + >, K < + > and Ca < 2 + >, and the cations can participate in electrochemical reaction of the sodium ion battery, so that reversible capacity is provided, capacity loss generated after the positive electrode active material is passivated is made up, and the cycle performance of the battery is improved. Meanwhile, the solid electrolyte interfacial film containing the cations is beneficial to reducing the impedance of the battery, so that the cycle performance of the battery is further improved.

The invention belongs to the technical field of battery material synthesis, and discloses a sodium ion battery hard carbon negative electrode material, a preparation method of the sodium ion battery hard carbon negative electrode material, a negative electrode and a sodium ion battery. Unsaturated oxygen-containing sites of the hard carbon material are eliminated through calcination under the low-temperature (500-700 DEG C) condition, and the first-circle irreversible capacity loss is reduced; meanwhile, a sodium polyphosphate coating layer is formed in situ, so that the diffusion rate of sodium ions is increased. According to the method, surface modification and coating of the hard carbon material are achieved in one step, the first-week coulombic efficiency of the obtained hard carbon negative electrode material is larger than 89.4%, and the capacity retention rate gt after 200 times of circulation under 200 mA. G <-1 > is achieved; and the rate capability is excellent. The method is simple and controllable in process, low in raw material cost, environment-friendly and suitable for large-scale production.

The invention provides a sulfinate organic positive alkali metal ion supplement for a secondary battery, and relates to the technical field of secondary batteries. The organic positive electrode alkali metal ion supplement has a structure as shown in the following general formula: [R-SO2]-M < + >, wherein M < + > is a metal cation and is selected from at least one of Li < + >, Na < + > and K < + >; [R-SO2]-is a sulfinate anion, and wherein R is an organic group. The supplement compensates irreversible capacity loss by efficiently releasing active ions, so that the energy density of the battery is improved; the oxidation potential is proper, the environmental stability is excellent, and the catalyst is not needed to decompose and easy to process; decomposition products are harmless, an electrode interface can be optimized, and the cycle life of the battery is remarkably prolonged.

A positive electrode material is presented for a rechargeable electrochemical cell that comprises a negative electrode, a positive electrode, and an electrolyte. The positive electrode material comprises a compound with the general formula ζ-AxMyV2O5 and / or ζ-AxMyNzV2- z05, where M and N are transition metals, alkaline earths, alkalis, post-transition metals, metalloids, or a combination thereof and A is one or more ions selected from the group consisting of Li, Na, K, Mg, Ca, Zn, and Al ions. This series of vanadium oxide compounds provides additional electrochemically active ions above the quantity required for cycling that are used to mitigate first cycle capacity losses, also known as formation losses, in secondary batteries.

The invention relates to a secondary battery and electronic equipment, the secondary battery comprises an electrode assembly, the electrode assembly comprises a first pole piece, the first pole piece is a negative pole piece, one part of the first pole piece comprises a second current collector and a first active layer, and the other part of the first pole piece comprises a first current collector and a second active layer; the thickness of the first current collector along the first direction is greater than that of the second current collector along the first direction; the first pole piece is a negative pole piece, the second current collector comprises a first metal layer, and the first metal layer comprises copper; the first current collector comprises a second metal layer and a third metal layer which are stacked in the first direction, the second metal layer comprises copper, and the resistivity of the third metal layer is larger than that of the second metal layer. According to the secondary battery and the electronic equipment, the problem of capacity loss of the secondary battery can be improved.

The present application relates to the technical field of batteries, and in particular relates to a positive electrode pole piece and a preparation method therefor, as well as a battery and a preparation method therefor. The positive electrode pole piece comprises a current collector, a non-active layer, an active material layer and a tab, the non-active layer and the active material layer being disposed on at least one side surface of the current collector. The active substance layer comprises an active substance, and the non-active layer does not comprise an active substance. Along an extension direction of the tab, the edge of the non-active layer extends past the edge of the active substance layer. The non-active layer provided by the present application not only has the function of protecting the current collector, but can also prevent transition band capacity loss without affecting the capacity utilization of the active substance.

The invention belongs to the technical field of preparation of sodium ion battery electrode materials, and provides a high-performance sodium storage material based on Zn-doped modified P2 type sodium nickel manganese oxide, a preparation method and a battery. The invention aims to solve the problems of rapid capacity attenuation under high voltage, obvious volume change in the phase change process, irreversible capacity loss and the like of the existing P2 type sodium nickel manganese oxide material. According to the main technical scheme, through low-concentration Zn doping, the structural stability of the material is optimized, and the electrochemical performance of the material is improved on the premise that voltage, capacity and energy density are not sacrificed. The preparation method comprises the following steps: dissolving a sodium source, a manganese source, a nickel source and a zinc source, adding a complexing agent for reaction, evaporating the solvent to dryness, and performing two-stage calcination to finally obtain the zinc-doped sodium-nickel-manganese oxide with the P2 type layered structure. The material can be used for high-safety sodium ion battery positive electrodes and is widely applied to the fields of energy storage power stations, low-speed electric vehicles and the like.

The invention provides a method for evaluating the cycle performance of a battery cell. Specifically, the evaluation method comprises the following steps: based on a preset cyclic charging and discharging method, carrying out cyclic charging and discharging on a battery cell, and testing the discharge capacities of a first cycle and at least one target cycle; according to the discharge capacity of the first cycle and the discharge capacity of any target cycle, determining a cell capacity retention rate corresponding to the target cycle; wherein the cyclic charging and discharging method comprises an acceleration method, and the acceleration method comprises the following steps: continuously discharging for a preset duration under a preset voltage; wherein the preset voltage is smaller than the minimum working voltage of the battery cell. By controlling the continuous discharge preset duration of the battery cell under the preset voltage, the capacity loss is accelerated, and the capacity distinction degree in unit time is improved, so that the cycle capacity retention ratio difference of different design battery cells is identified in a shorter time, and the iteration period is shortened.

The invention relates to the technical field of lithium battery charging application, and discloses a lithium metal battery service life prolonging method based on a bidirectional pulse charging strategy. According to the method for prolonging the service life of the lithium metal battery based on the bidirectional pulse charging strategy, the deposition of a lithium metal negative electrode in the charging and discharging process of the battery is more uniform and compact by adjusting the frequency, duty ratio, forward and reverse amplitude and the like of the bidirectional pulse charging current, so that the polarization in the battery is improved, the irreversible capacity of the battery is reduced, and the service life of the battery is prolonged. The bidirectional pulse charging method can effectively improve the lithium dendrite precipitation phenomenon of the negative electrode, reduces the internal impedance and irreversible capacity loss of the battery, can improve the cycling stability and safety of the battery, and prolongs the service life of the lithium metal battery.

The invention provides a battery life prediction method, apparatus and device, and a medium, and relates to the technical field of batteries, the method comprises the following steps: obtaining a first historical data set and a second historical data set of a to-be-detected battery within a preset historical time; obtaining a storage capacity loss model, determining to-be-tested parameters of the storage capacity loss model based on the first historical data set, and obtaining a target storage capacity loss model; obtaining a cycle capacity loss model, determining to-be-measured parameters of the cycle capacity loss model based on the second historical data set, and obtaining a target cycle capacity loss model; determining an actual capacity loss model according to the target storage capacity loss model and the target cyclic capacity loss model; determining an actual capacity loss curve according to the actual capacity loss model; and determining the actual battery life of the to-be-tested battery according to the actual capacity loss curve. The prediction accuracy of the battery life is improved.

A composite ion exchange membrane, a preparation method therefor and a use thereof, and a zinc-iodine flow battery. By introducing halogen adducts onto a porous membrane, a composite membrane based on a series of localized high iodine concentration (LHIC) coatings is constructed to suppress the problem of crossover of active polyiodide compounds in a catholyte. Specifically, metal oxides exhibit a strong physicochemical adsorption effect toward halogens, and halogen oxide adducts are formed, the halogen oxide adducts becoming effective halogen carriers. An LHIC coating is constructed on the porous membrane by utilizing the strong adsorption characteristic of the carriers and halogen (such as iodine), thereby enhancing the selectivity of the porous membrane toward iodine species. On the basis of Donnan exclusion and concentration gradient effects, a constructed localized high-concentration membrane can effectively suppress the diffusion of halogens from a positive electrode in a zinc-iodine battery / zinc-bromine battery, mitigating the problem of capacity loss of a zinc-iodine / zinc-bromine flow battery, and achieving long-term cyclic stability.

The invention discloses a method for preparing a negative pole piece through soft contact pre-sodium treatment, the negative pole piece and a sodium ion battery comprising the negative pole piece. The method comprises the steps that a negative pole piece of the sodium ion battery is provided, the negative pole piece comprises a negative current collector and a negative film layer located on at least one side of the negative current collector, and the negative film layer comprises a negative active material; enabling the negative pole piece to be in contact with electrolyte so as to enable the electrolyte to infiltrate the negative pole film layer; a pre-sodium treatment step: enabling sodium metal to be in contact with the negative electrode film layer, and applying pressure to enable part of the sodium metal to react with the negative electrode active material in the presence of the electrolyte; and removing the residual sodium metal to obtain the negative pole piece. According to the invention, soft contact sodium pre-treatment can be carried out on the negative pole piece, so that irreversible capacity loss of sodium ions is made up, and the first coulombic efficiency of the sodium ion battery is improved.

The invention discloses a ternary positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of lithium ion batteries. The method comprises the following steps: modifying a ternary matrix material in a composite doping manner of rare earth elements and transition metals, and then coating the surface of the material with a layer of amorphous ferric fluoride in a manner of combining atomic layer deposition with fluorination reaction. The ternary positive electrode material provided by the invention has higher rate capability and better cycling stability, and can maintain better chemical performance under high current density, so that the problems of capacity loss and poor electrical performance of the ternary positive electrode material of the lithium battery in a high-voltage long-cycle process are greatly relieved.