1347 results about "Electric Capacitance" patented technology

The invention relates to the technical field of SOC estimation, in particular to an SOC estimation method and system for a lithium battery pack. The method comprises the following steps: collecting basic parameters and voltage data of a lithium battery pack, generating steady-state voltage data by using singular value decomposition and time domain reconstruction, further performing multi-level feature mapping and performance reconstruction to obtain basic discharge data, calculating battery energy efficiency and deducing normal power consumption based on the data, and calculating the energy efficiency of the lithium battery pack. Discharging simulation is carried out to evaluate the temperature rise condition, discharging capacity attenuation is predicted in combination with working environment parameters, relative errors are calculated, finally, the charge state is corrected, electric quantity self-calibration is carried out, and intelligent state estimation of the lithium battery pack is achieved. According to the invention, a more efficient SOC estimation method is realized.

The invention relates to the technical field of sodium ion batteries, in particular to a sodium ion electrolyte, a preparation method thereof and a battery. The sodium ion electrolyte comprises an ester solvent, salts and an additive, wherein the ester solvent comprises chain carboxylic ester, chain carbonic ester and cyclic carbonic ester, and the salt comprises sodium salt. The sodium ion electrolyte provided by the invention has high low-temperature conductivity, not only can improve the low-temperature discharge capacity, but also can improve the low-temperature charging capacity, and can widen the charging window of a conventional commercial sodium battery from 0 DEG C to-30 DEG C.

The invention provides an optical storage parallel network control method, which comprises the following steps: calculating the current load rate percentage of each residual unit according to the connection relation and electrical path information of the residual units after isolation; evaluating the available margin capacity and the frequency regulation bearing capacity of the remaining units, matching the available margin capacity and the frequency regulation bearing capacity with a specific power value and a frequency regulation requirement which need to be compensated, and determining a feasible unit combination scheme for fault recovery; generating a power redistribution list and a frequency adjustment responsibility distribution table according to the direct current bus connection mode of the optimal unit recombination, and obtaining an output power set value and a frequency adjustment parameter of each unit after adjustment; and extracting the continuous power supply time value of the optical storage parallel network, updating the total power supply capacity value of the optical storage parallel network, and maintaining the continuous power output and frequency stability after the fault of the optical storage parallel network.

The invention discloses a capacitive voltage transformer for a gas insulated substation, which comprises a capacitive voltage divider and an electromagnetic unit, the capacitive voltage divider comprises a high-voltage capacitor C1 and a medium-voltage capacitor, the medium-voltage capacitor comprises a medium-voltage capacitor C21 and an externally connected medium-voltage capacitor C22, and the capacitance of the medium-voltage capacitor C22 is greater than that of the medium-voltage capacitor C21; the electromagnetic unit is connected with the capacitive voltage divider, an intermediate transformer and a compensation reactor are arranged in the electromagnetic unit, a full-shielding high-voltage shielding cover is arranged outside a high-voltage coil of the intermediate transformer, a damper and an overvoltage protector are arranged outside the electromagnetic unit, and the damper and the overvoltage protector are placed in an external junction box. The problem that in the prior art, an extra-high voltage transformer is low in lightning impulse overvoltage tolerance capacity is solved, the impulse overvoltage tolerance capacity is improved, and the breakdown risk is reduced.

The invention discloses an extra-high voltage DC bushing insulation state monitoring system and method, and belongs to the technical field of bushing monitoring, and the system comprises a monitoring platform, a bushing partial discharge monitoring device, and a bushing dielectric loss, capacitance and leakage current monitoring device. The bushing partial discharge monitoring device comprises a high-frequency partial discharge acquisition module and a high-frequency pulse current sensor, and the high-frequency pulse current sensor, the high-frequency partial discharge acquisition module and the monitoring platform are in signal connection in sequence; the bushing dielectric loss, capacitance and leakage current monitoring device comprises a dielectric loss acquisition module, a leakage current sensor and a signal sampling unit, the leakage current sensor and the signal sampling unit are both in signal connection with the dielectric loss acquisition module, and the dielectric loss acquisition module is in signal connection with the monitoring platform. According to the invention, through integration of the monitoring platform and the monitoring equipment, comprehensive real-time monitoring of the running state of the sleeve is realized.

The invention relates to the field of batteries, in particular to an all-solid-state thin film battery and a preparation method thereof. The all-solid-state thin film battery comprises a positive electrode current collector layer, a positive electrode layer, a solid electrolyte layer, a negative electrode layer and a negative electrode current collector layer, the thicknesses of the positive electrode layer and the solid electrolyte layer are 10 nm to 50 [mu] m, and the positive electrode layer is made of a material which contains a sulfur element and has the capacity of storing and discharging electricity; when the positive electrode layer is made of a material which contains a sulfur element and a metal element and has electricity storage and discharge capabilities, the thickness of the negative electrode layer is 0 nm to 50 [mu] m; when the positive electrode layer is made of a material which contains a sulfur element and has electricity storage and discharge capabilities, the thickness of the negative electrode layer is 10nm-50mu m; the thickness of the positive electrode current collector layer is 10 nm to 100 [mu] m; and the thickness of the negative current collector layer is 0 nm to 100 [mu] m. According to the invention, the cost of the battery can be effectively reduced, the capacitance of the battery is improved, and large-area and mass production of the battery can be realized.

The invention provides a lithium battery full-temperature-range DCR fitting test method and system based on multi-factor coupling, and relates to the technical field of lithium batteries, and the method comprises the steps: obtaining a to-be-tested lithium battery, carrying out the charge-discharge cycle under a set condition, and measuring the average discharge capacity as an initial capacity reference; the method comprises the following steps: carrying out multi-state-of-charge calibration on a lithium battery cell, adjusting the lithium battery cell to a set target SOC point, sequentially placing the lithium battery cell in different temperature environments to be stable, measuring the DCR value at each temperature, then carrying out cyclic aging on the lithium battery cell to different health states, and measuring the DCR values at each temperature and in different health states; based on the DCR values in different health states at different temperatures, utilizing an Arrhenius formula to fit the relation between the DCR values and the temperatures, introducing an SOC correction function and an SOH correction function, and constructing a three-dimensional DCR fitting model; and according to the fitting model, inputting the target temperature T, the SOC and the SOH, and outputting an estimated test DCR value.

According to the capacitor health state evaluation method and device, the storage medium and the computer equipment provided by the invention, the capacitor health state evaluation model is determined, and the capacitor health state evaluation model is used for controlling the fault-free sample capacitor to perform multi-state operation, and obtaining the electrical parameters of the sample capacitor in the multi-state operation; the temperature rise value of the sample capacitor under the multi-state operation is obtained, according to the electrical parameters and the temperature rise value corresponding to the sample capacitor, a classification prediction algorithm based on XGBoost is adopted, and the electrical parameters comprise the capacitance, the dielectric loss angle tangent value and the equivalent series resistance value; and acquiring an electrical parameter and a temperature rise value of the to-be-evaluated capacitor, and inputting the electrical parameter and the temperature rise value into the capacitor health state evaluation model to obtain a health state evaluation result of the to-be-evaluated capacitor. Therefore, the blank of the multi-parameter fusion evaluation method for the health state of the capacitor for the flexible direct current converter valve is filled, and different health states of the capacitor can be quickly and accurately identified.

The invention discloses a method for evaluating deformation of a transformer winding based on a frequency response-impedance-capacitance comprehensive model. Characteristic indexes are obtained through loss testing, direct measurement and a low-voltage impedance method, collaborative diagnosis is conducted through a frequency response method, an impedance method and a capacitance method, a diagnosis model is established, and therefore the specific position and type of a fault are obtained. According to the method, three methods are comprehensively utilized to evaluate the transformer winding, and the problems that an existing transformer winding deformation state evaluation method is single, limited in data and inaccurate in evaluation result are solved.

The utility model discloses a silicon capacitor electrode structure and a silicon capacitor, which can further improve the capacitance of a capacitor in a limited space by nesting, combining and arranging a plurality of groups of element arrays distributed in a triangular grid mode more reasonably and precisely, so that the capacitor can store more charges.

The invention relates to the field of storage battery capacity detection, and provides a method for predicting nuclear capacity discharge of a storage battery. The method comprises the following steps: firstly, sampling by adopting a traditional static discharge test method to obtain actual discharge capacity time sequence data of a storage battery pack, and preprocessing the time sequence data; then, constructing a hyper-parameter-based long short-term memory (LSTM) network model, and exploring global optimal hyper-parameters of the LSTM algorithm model by adopting a novel particle swarm optimization (PSO) algorithm to obtain an optimized LSTM algorithm model; and finally, carrying out network training and data prediction on the optimized LSTM algorithm model by adopting the obtained training set data and test set data, and verifying the prediction effect of the storage battery nuclear capacity discharge prediction model. Through verification, complete discharge data of the storage battery can be accurately predicted through short-time discharge data of the storage battery, and the problem that traditional storage battery nuclear capacity discharge detection is time-consuming and labor-consuming is solved.

The embodiment of the invention provides a silicon-carbon negative electrode material and a preparation method thereof, a negative electrode plate and a battery, the silicon-carbon negative electrode material comprises a silicon-carbon inner core and a coating layer coating the silicon-carbon inner core, and the silicon-carbon inner core comprises a porous carbon substrate and nanometer silicon arranged on the porous carbon substrate. The test result of the first cyclic volt-ampere test of the silicon carbon negative electrode material meets at least one of the following conditions: (a) the value of dQ / (dV * C) of a discharge differential capacity curve in a voltage interval of 0.45 V + / -0.05 V is less than or equal to 1.7, dQ / dV represents differential capacity, the unit is mAh / V, C represents charge capacity, and the unit is mAh; (b) no sharp peak exists in a discharge differential capacity curve in a voltage interval of 0.45 V + / -0.05 V, the battery can present a smooth and stable discharge process, the capacity retention ratio and the stability of the battery after circulation are improved, and the preparation method is simple, convenient and feasible, and is suitable for industrial production.

The invention discloses an electric bicycle health state evaluation method, system and device and a storage medium, and belongs to the field of lithium battery electric bicycles, and the method comprises the following steps: obtaining historical SOC data and current SOC data of an electric bicycle battery; calculating the current cycle index of the battery, and calculating the habitual charging depth of the user; obtaining the charging nominal capacity of the battery, and calculating to obtain a capacity attenuation empirical model; calculating a mean health state under the current cycle index; the current charging depth and the current charging capacity are calculated, whether the current charging depth meets the calibration condition or not is judged, and if yes, the average health state is calibrated through the charging nominal capacity and the current charging capacity, and the current cycle number is corrected; and if the calibration condition is not met or the calibration is completed, outputting the average health state of the electric bicycle. According to the invention, the battery health state can be monitored in an electric bicycle scene, a user is helped to know the health degree of the battery, and the use safety of the battery is improved.

The invention provides a lithium ion battery full-cell positive and negative electrode gram volume characterization method. The method comprises the following steps: assembling a positive plate and a lithium plate into a simple positive electrode cell, assembling a negative plate and the lithium plate into a simple negative electrode cell, and assembling the positive plate and the negative plate into a simple full-cell cell; sequentially connecting the negative simple battery cell, the full-battery-cell simple battery cell and the positive simple battery cell in series; then the series circuit is charged according to a full-cell charging mode, and charging is ended after full charging; recording the charging capacity C0, and calculating the charging gram capacity of the positive and negative electrodes of the whole battery core; and finally, discharging the series circuit in a full-cell discharging mode, and ending discharging after full discharging. And recording the discharge capacity C1, and calculating the discharge gram capacity of the positive and negative electrodes of the full cell. According to the invention, the positive simple half cell, the full-cell simple half cell and the negative simple half cell are connected in series, so that the positive and negative gram volumes and the positive and negative potentials of the full cell of the lithium ion battery can be obtained after charging and discharging.

The invention discloses a biological carbon / graphene composite material as well as a preparation method and application thereof. The method comprises the following steps: impregnating a biomass raw material with a copper salt solution to obtain a precursor; the precursor is pyrolyzed to obtain a copper oxide modified biological carbon material, then under the conditions of reducing atmosphere and high temperature, carbon dioxide serves as a carbon source, graphene is generated on the copper oxide modified biological carbon material in situ, the biological carbon / graphene / copper composite material is obtained, and the biological carbon / graphene / copper composite material is subjected to copper leaching treatment to obtain the graphene / copper composite material. Obtaining a finished product. The composite material has excellent electrochemical performance, and has excellent rate capability, capacitance and long cycle service life when being used for preparing a capacitor. The preparation method is simple, low in cost and suitable for industrial production.

The invention provides a battery module and a battery life prolonging method thereof, the battery life prolonging method is applied to a battery management system, and a charger is controlled by the battery management system to charge a battery cell group. Before the battery cell group is charged, after a target charging electric quantity value of the battery cell group is set according to the battery health state of the battery cell group, a constant-current charging mode is entered, and a charger starts to charge the battery cell group. And then, calculating a charged electric quantity value of the battery cell group, and when the charged electric quantity value is greater than the target charging electric quantity value, ending the constant-current charging mode. Therefore, the aging condition of the battery is estimated before charging, different life prolonging strategies are adopted, and then the target charging electric quantity value of the battery is dynamically changed, so that the full capacitance can be gradually improved according to the aging degree, and the purpose of prolonging the service life of the battery is achieved.

The invention relates to an annular cement-based supercapacitor and a preparation method and application thereof. The supercapacitor comprises a first circular electrode layer, an annular electrolyte layer and a second annular electrode layer which are sequentially arranged from inside to outside. The first circular electrode layer and the second annular electrode layer are composed of the following components in parts by weight: 100-900 parts of a cementing material, 8-95 parts of a conductive material, 1-50 parts of a water reducing agent, 10-60 parts of an early strength agent and 200-800 parts of water; the annular electrolyte layer comprises the following components in parts by weight: 30-400 parts of a cementing material, 0.05-4 parts of a water reducing agent, 1-20 parts of an early strength agent and 10-200 parts of water; and the three layers all contain inorganic metal ions. The defects of a traditional cement-based super capacitor are structurally improved, the electrode / electrolyte contact area, the ion transmission efficiency and the mass capacitance of the capacitor are obviously improved, and meanwhile the capacitor has the excellent mechanical property.

The invention discloses a health assessment method of a vehicle-mounted battery system and a vehicle. The method comprises the following steps: under the condition of determining that a charge state value of a battery system meets a preset discharge condition, discharging the battery system until the voltage of a single battery of the battery system meets a preset calibration condition; calibrating the state-of-charge value of the battery system based on the relation curve of the state-of-charge value and the open-circuit voltage and the open-circuit voltage of the battery system; charging the calibrated battery system until the state-of-charge value of the battery system meets a preset full charge condition; and evaluating the health state of the battery system based on the original capacity and the actual charging capacity of the battery system, and generating a health evaluation result of the battery system. According to the invention, the technical problems of difficult long-term running vehicle battery state capacity test and insufficient test precision in the prior art are solved.

The invention belongs to the technical field of lithium battery materials, and particularly relates to a preparation method of a polyvinylidene fluoride-hexafluoropropylene-based solid-state lithium battery, and the preparation method comprises the steps of preparing a composite solid electrolyte membrane and assembling the battery. Polyvinylidene fluoride hexafluoropropylene, lithium salt and nitrogen-methyl pyrrolidone are used as raw materials, and the plasticizer and the dendritic mesoporous nano silicon dioxide are added to prepare the composite solid electrolyte membrane, so that more conductive channels are provided for migration of lithium ions, and the electric capacity of the electrolyte is improved; according to the preparation method, the interface compatibility between the PVDF-HFP and the dendritic mesoporous nano silicon dioxide is improved, the electrochemical performance is improved, the crystallinity of the PVDF-HFP is reduced, and short circuit and explosion caused by the fact that dendritic crystals pierce the diaphragm are avoided; the invention solves the potential safety hazards caused by the traditional liquid electrolyte, such as leakage, combustion, explosion and the like, and has the advantages of simple preparation method and low cost, and is suitable for industrial large-scale production.

The invention discloses a display panel and a display device. A pixel circuit of the display panel comprises a driving transistor, a compensation transistor and a storage capacitor which are connected, the driving transistor comprises a driving active part and a driving grid electrode, the compensation transistor comprises a compensation active part and a compensation grid electrode, and the compensation active part and the driving active part are made of different materials. The storage capacitor comprises a first pole plate and a second pole plate which are oppositely arranged, the first pole plate and the driving grid are made of the same material, and the second pole plate and the compensation grid are made of the same material; the first polar plate of the storage capacitor is prepared from the material of the driving gate, and the second polar plate of the storage capacitor is prepared from the material of the compensation gate, that is, the materials of the two capacitor polar plates of the storage capacitor are metal materials, so that the technical problem of insufficient conductor of the capacitor polar plates is eliminated, and the capacitance of the storage capacitor is ensured; and the display effect of the display panel is improved.

The present application relates to the field of positive electrode material preparation, and specifically to a high-voltage ternary positive electrode material, and a preparation method and an application thereof. The preparation method of the high-voltage ternary positive electrode material comprises: mixing a nickel-cobalt-manganese hydroxide precursor with a lithium source, and calcining same to obtain a high-voltage positive electrode material intermediate; mixing the high-voltage positive electrode material intermediate with a cobalt element additive and a lithium element additive, and calcining same to obtain the high-voltage ternary positive electrode material, wherein based on the weight of the high-voltage positive electrode material intermediate, the cobalt element doping amount in the cobalt element additive is 2000-10000 ppm, and the lithium element doping amount in the lithium element additive is 500-2000 ppm. The preparation method of the high-voltage ternary positive electrode material of the present application can improve the stability of the ternary positive electrode material, reduce the surface alkali of the ternary positive electrode material, and also increase the capacity under high voltage of a lithium-ion battery formed.

The invention discloses a lithium carbon fluoride battery electrolyte and a lithium carbon fluoride battery. In order to improve the long-time shelving safety performance and power discharge performance of a lithium carbon fluoride battery in a high-temperature environment and further improve the application prospect of the lithium carbon fluoride battery, the technical scheme adopted by the invention is as follows: the lithium carbon fluoride battery electrolyte is provided and comprises an organic solvent, electrolyte salt and an additive, wherein the electrolyte is a mixture of any one of lithium tetrafluoroborate, lithium bis (trifluoromethylsulfonyl) imide, lithium bis (fluorosulfonyl) imide and lithium trifluoromethanesulfonate and lithium difluorophosphate, and the additive comprises a silane additive, an anhydride additive and a phosphazene additive in a mass ratio of (1-5): (0.5-1): (3-10). According to the electrolyte system disclosed by the invention, the high-low temperature discharge capacity and the large-current pulse discharge capacity of the lithium carbon fluoride battery are obviously improved, and meanwhile, the high-temperature shelving safety performance is also obviously improved.

The invention discloses an energy storage battery cell test automatic sample loading method based on a mechanical arm, and relates to the technical field of automation. The mechanical arm control unit calculates an obstacle avoidance track used for grabbing the battery cell according to the battery cell space parameters; the mechanical arm tool end moves to the position above the battery cell according to the obstacle avoidance track, and vacuum adsorption is executed to grab the battery cell; after grabbing is completed, the mechanical arm tool end conveys the battery cell to a test area, and a test ready signal is output; when the control system receives a test ready signal, testing the electric capacity and the resistance value of the battery cell; and after the test is completed, the mechanical arm tool end carries the battery cell to a corresponding storage station according to the classification of the test result, and automatic sample loading of the battery cell test is completed. The whole process of grabbing, carrying, testing and classified storage of the battery cells is automatically completed through the mechanical arm, manual intervention is reduced, and the production efficiency is remarkably improved.

The invention relates to a Bayesian optimization-based lithium ion battery health state prediction method and system, and the method comprises the steps: 1, obtaining the charging and discharging data of a battery, carrying out the preprocessing of the charging and discharging data of the battery, and extracting a key health factor from the preprocessed data; the key health factors comprise constant-current charging time, voltage fluctuation and the change rate of discharge capacity along with time; 2, constructing an initial BiSLTM model based on the key health factors, setting an initial hyper-parameter combination, adjusting hyper-parameters by using Bayesian optimization to obtain an optimal hyper-parameter combination, and constructing a BiLSTM optimal model by using the obtained optimal hyper-parameter combination; and step 3, predicting the health state of the battery by using the BiLSTM optimal model. According to the method, the hyper-parameters of the BiLSTM model are optimized through Bayesian optimization, the problem of BiLSTM hyper-parameter tuning is solved, the globally optimal solution can be efficiently found under the condition that the number of evaluation times is limited, the search duration is greatly shortened, and the generalization efficiency of the model is improved.

The invention discloses a charging pile output power limiting method and system based on battery dynamic parameters. The method comprises the steps that the maximum output power Pmax of a charging pile is set based on the power supply capacity Pgrid of a power grid, and a first sampling period T1 is set; acquiring a battery open-circuit voltage Uoc, an initial charging voltage U0 and a charging current I0; obtaining Rbat based on the Uoc, the U0 and the I0; based on the Pmax, the Rbat and the Uoc, the maximum allowable current Imax of the charging pile is determined; a charging request current Ireq is obtained, if Ireq is larger than Imax, I is set to be equal to Imax, and otherwise I is set to be equal to Ireq; and based on T1, collecting a charging voltage U and a charging current I, and updating Uoc and Rbat so as to limit the output power of the charging pile. The method has the advantages that the maximum allowable output current is dynamically adjusted according to the dynamic parameters of the battery, the output power is effectively prevented from exceeding the limit, and the polarization of the battery is prevented from being aggravated.

The invention discloses a method for regulating and controlling a pore structure of a cement-based supercapacitor, and belongs to the technical field of energy storage. The method for regulating and controlling the pore structure of the cement-based supercapacitor comprises the following steps: firstly, preparing foam, then uniformly stirring cement and sand, adding water and a water reducing agent, fully stirring, and finally, doping the foam into slurry, and fully stirring to obtain the slurry. And pouring the stirred slurry into a mold, standing for 24 hours, and demolding to obtain the cement matrix. And packaging the front, back, left and right surfaces of the cement matrix by using epoxy resin, and drying at 60 DEG C for 3 days. And soaking the treated test piece in a 2mol / L KOH solution for 5 days, and then manufacturing the test piece into the cement-based supercapacitor. According to the invention, the regulation and control of the pore structure of the cement-based supercapacitor are realized, the treated cement-based supercapacitor has better pore connectivity, the pores show tropism, the conductivity and the capacitance are better, the specific capacitance can reach 63.3 F / m < 2 > to the maximum, and the compressive strength and the breaking strength are reduced.

The invention relates to the technical field of intelligent detection, and discloses an online monitoring method and system for a monitoring system storage battery, and the method comprises the steps: collecting the real-time capacitance and rated capacitance of the storage battery, and determining a pulse current parameter; the method comprises the following steps: acquiring environment temperature data and load data of a storage battery to determine pulse interval time, acquiring static voltage of the storage battery to apply pulse current to the storage battery according to pulse current parameters when a monitoring condition is reached, acquiring voltage data in pulse duration to obtain a voltage steady-state value and a recovery time constant, and finally obtaining the characteristic data value of the storage battery, comparing the characteristic data value with a historical data value, judging whether to carry out early warning on the health condition of the storage battery or not, and adjusting the pulse interval time according to the characteristic data value when judging to carry out early warning on the health condition of the storage battery. According to the invention, the detection accuracy is improved, the potential problems of the storage battery can be found and dealt with in time, and the safety and reliability of the system are improved.

The invention belongs to the technical field of flexible transparent energy storage, and discloses a preparation method and application of a flexible stretchable transparent MXene / AgNWs / PDMS composite film electrode, according to the method, a PDMS substrate film, AgNWs and MXene are assembled layer by layer, and a Schottky barrier is formed between one-dimensional AgNWs and two-dimensional MXene, so that the MXene material is firmly attached to the surface of the AgNWs material, corrosion of the AgNWs can be prevented, and the service life of the flexible stretchable transparent MXene / AgNWs / PDMS composite film electrode is prolonged. According to the MXene / AgNWs / PDMS composite film electrode, the cycle stability of the composite electrode is improved, a 1D / 2D heterostructure can be formed, the electrochemical storage capacity of the MXene / AgNWs / PDMS composite film electrode is effectively improved, and a flexible transparent supercapacitor with high light transmittance, high capacitance and mechanical flexibility perfectly unified is expected to be achieved.

The invention belongs to the related technical field of capacitor life prediction, and particularly relates to a metallized film capacitor life prediction method, which comprises the following steps: carrying out an aging simulation test on a sample capacitor, cooling the sample capacitor after each round of test, measuring the capacitance of the sample capacitor, and calculating the capacitance attenuation value under each round; when the capacitance attenuation value and the number of turns reach preset values, fitting to obtain a linear relationship between the number of turns and the capacitance attenuation value, thereby obtaining a corresponding turn when the capacitance is attenuated to a performance deterioration index, and obtaining attenuation duration according to the turn; wherein the preset value corresponding to the capacitance attenuation value is smaller than the performance deterioration index; and according to the attenuation duration and other simulation experiment parameters and actual working condition data required by the capacitor failure life evaluation and prediction theoretical model, calculating the service life of the metallized film capacitor under the actual working condition by adopting the capacitor failure life evaluation and prediction theoretical model. The method can simply and conveniently predict the operation life of the metallized film capacitor.

The invention relates to the technical field of lithium air batteries, and particularly discloses a complexing type metal inorganic salt additive for a lithium air battery and application of the complexing type metal inorganic salt additive. According to the invention, SnCl2 is introduced into the DMSO electrolyte or diaphragm, and the effect of the DMSO electrolyte or diaphragm is optimal. SnCl2 coated on the diaphragm is gradually released into the DMSO electrolyte, so that Sn < 2 + > is always in saturation concentration; in the charging and discharging process, Sn < 2 + > ions, DMSO and Cl <-> form solvated ions to be complexed with superoxide anions, a Sn < 2 + >-(O < 2->, DMSO and Cl <->)-Li < + > complex is formed, the solubility of O2 in the electrolyte is remarkably improved, and the reactivity of O2 is reduced. The reaction characteristic can realize lithium peroxide liquid phase growth, shows a high-porosity three-dimensional porous particle morphology, and is beneficial to improving the discharge capacity and reversibility. Therefore, excessive SnCl2 is introduced in a diaphragm loading mode, and the discharge capacity and the cycle performance of the lithium air battery can be remarkably improved.