764 results about "Self-discharge" patented technology

The invention relates to the technical field of supercapacitors, and provides a cement-based supercapacitor, a preparation method and application. The cement-based supercapacitor comprises a cement-based electrolyte and two structural electrodes arranged on the two sides of the cement-based electrolyte. The cement-based electrolyte is prepared from cement, alkali, alkali metal salt, water and an additive, wherein the alkali metal salt comprises lithium salt; each structural electrode is composed of foamed nickel loaded with nitrogen-doped reduced graphene oxide. The lithium salt is added to construct an efficient ionic conductive network, so that the ionic conductivity of the cement-based electrolyte is enhanced, and the electrochemical performance is obviously improved. The reduced graphene oxide in the structural electrode is doped with nitrogen to enhance the electrostatic force between ions and the surface of the electrode, so that the electrochemical stability of the surface of the electrode is improved, and self-discharge is effectively inhibited. By improving an electrolyte and a structural electrode material, a cement-based supercapacitor with specific capacitance and mechanical properties is obtained and is combined with a building structure to realize building energy storage.

The invention relates to the field of lithium battery detection, and particularly discloses a lithium ion battery fault detection method, which comprises the following steps of: firstly, acquiring total current data of a battery pack in real time, and judging the current running state of a battery system according to the total current of the battery pack and the duration time; and when the battery system is in a standing state, calculating the voltage drop rate and the temperature rise rate of each single battery in a preset time window, and comparing the voltage drop rate and the temperature rise rate with corresponding thresholds to realize self-discharge detection and fault identification. And when the battery system is in a charging or discharging state, a deep learning algorithm is further introduced, temperature-pressure coupling time sequence fluctuation characteristics of each single battery are extracted, and temperature-pressure coupling time sequence fluctuation state consistency analysis is performed on each single battery, so that intelligent detection of faults of the single batteries in the charging and discharging process is realized. According to the method, the abnormal temperature and pressure fluctuation of the single battery in the charging and discharging process can be effectively captured, so that early warning and accurate positioning of a fault are realized.

The invention relates to a lithium ion battery self-discharge consistency screening method. The method comprises the following steps: S1, fully charging n formed battery cells, carrying out constant-current discharge to 2.5 V after shelving, obtaining a discharge curve, and recording inflection point voltage U1 on the curve; s2, recording a corresponding voltage value on the curve, which is less than or equal to U1 and greater than 3% SOC, as U2; charging the battery cell to U2; s3, placing all the battery cells T1, placing the battery cells T2 at a high temperature, continuously placing the battery cells T3 at a normal temperature, and testing an open-circuit voltage OCV2; placing the battery cell at normal temperature for T4, and testing open-circuit voltage OCV3; s4, calculating a K value of each battery cell; s5, calculating an average value alpha and a standard deviation sigma of the K values of all the battery cells; and S6, comparing the K value of each battery cell with the value of alpha + x sigma, and screening out the battery cells of which Ki is greater than alpha + x sigma in the group. According to the method, the test time is shortened, the influence of temperature and polarization on the test is reduced, and the screening result is more accurate.

The invention relates to a battery self-discharge characteristic analysis and rapid evaluation method, and aims to improve the precision and efficiency of battery self-discharge performance detection. According to the method, in a set environment stable interval, an instantaneous voltage change sequence and a current perturbation response sequence of a target battery are acquired through micro-load disturbance, and a battery internal resistance dynamic evolution tensor representing dynamic response characteristics in the battery is constructed; extracting local features by applying a multi-scale time window segmentation strategy, forming a feature vector group containing a voltage nonlinear rebound factor and a delay response index, inputting the feature vector group into a trained Bayesian weighted adaptive mapping network, and outputting a battery self-discharge rate estimated value combining a manufacturing batch residual error and temperature offset compensation; performing trend fitting and consistency checking on the estimated value to obtain a battery self-discharge grade evaluation result, and generating a structured detection report containing initial offset, rebound amplitude and estimation confidence; the method can be widely applied to battery production, quality control and performance screening scenes.

The invention relates to the field of power batteries, and discloses a battery cell self-discharge intelligent screening method, which comprises the following steps: firstly, calculating a self-discharge rate factor K value of a battery cell in a finished product standing warehouse process section, if the K value does not reach the standard, rejecting the battery cell, if the K value reaches the standard, putting the battery cell into a finished product warehouse for standing, and then calculating a self-discharge rate factor K2 value of the battery cell in a rubber coating process section, according to K2 values of the battery cells in different offline time periods and at different temperatures, a nonlinear binary regression equation is fitted, so that a theoretical value and an actual value of K2 are calculated to judge the self-discharge condition of the battery cells, and the battery cell self-discharge intelligent screening method is suitable for battery cell offline from a finished product standing warehouse to module making or module making. According to the invention, the battery cells and modules with poor self-discharge are intercepted in the whole process of self-discharge and packaging of finished products, so that the battery cells with voltage difference and undervoltage risks are prevented from flowing into the market, and the detection accuracy and delivery quality of the self-discharge performance of the battery cells are improved.

The invention discloses a two-phase electrolyte, a preparation method thereof and a liquid energy storage battery system, and belongs to the technical field of electrochemical energy storage. According to the invention, a liquid-liquid double-phase electrolyte is composed of a water-phase electrolyte and an organic-phase electrolyte, wherein the organic-phase electrolyte contains a coupling system of 1-(methyl-decyl)-3-methylimidazolium bromide, tris (methyl-decyl) methyl ammonium bromide and (10-octadecyl) alkyl trimethyl ammonium bromide in a molar ratio of (5-7): (2-4): 1. During charging, positive electrode bromide ions are subjected to an oxidation reaction to generate a bromine simple substance, and meanwhile, the bromine simple substance and a coupling system of the quaternary ammonium bromide compound and the bromine complexing agent provided by the invention form a stable polybromine complex product, so that the polybromine complex product is prevented from being migrated into a water-phase electrolyte, and the purpose of improving the stability of the water-phase electrolyte in the absence of a diaphragm is achieved. The self-discharge reaction of bromine is significantly inhibited at a high temperature exceeding the boiling point temperature of bromine, the coulombic efficiency and energy efficiency of the liquid energy storage battery are improved, the system cost is reduced, and the long-term cycle stability of the liquid energy storage battery is improved.

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

The invention discloses a slurry electrolysis device and battery production equipment, and relates to the technical field of lithium batteries. As an electrolysis positive electrode and an electrolysis negative electrode are positioned between a slurry inlet and a slurry outlet and are in contact with battery slurry, the electrolysis positive electrode and the electrolysis negative electrode are in contact with the battery slurry; under the condition that the potential applied by a power supply for connecting the electrolysis positive electrode and the electrolysis negative electrode is greater than the oxidation potential of a to-be-electrolyzed metal element or alloy in the battery slurry, the to-be-electrolyzed metal element or alloy in the battery slurry can serve as a micro positive electrode, the surface of the to-be-electrolyzed metal element or alloy is oxidized due to potential difference and is gradually dissolved into ions, and the ions are gradually dissolved along with electrolysis. And large metal elementary substance particles are continuously oxidized, the volume is gradually reduced, and finally, the metal elementary substance particles are completely dissolved into metal ions without discharge risk, so that the removal of the metal elementary substance or alloy to be electrolyzed in the battery slurry is realized, and the self-discharge risk of the battery is reduced.

The invention relates to the technical field of batteries, and discloses a roll core and a battery. The roll core comprises a positive plate, a negative plate and a diaphragm, a groove is formed in a positive active layer of the positive plate, and the groove is at least formed in an arc section, closest to the winding center, of the positive plate, so that the thickness of at least partial region on the arc section of the positive plate is reduced, and the risk that active particles on the positive plate pierce the diaphragm is reduced; according to the present invention, by limiting the ratio p1 / H1 between the thickness p1 of the functional layer of the diaphragm and the depth H1 of the groove to be in the range of 0.02-2, the p1 is in the range of 0.3-10 [mu] m, and the H1 is in the range of 3-40 [mu] m, such that the battery can be reduced to the preset charging cut-off current during the charging process, and the self-discharge rate of the battery can be reduced. And on the basis that the battery can reach a fully-charged state, the liquid retention capacity of the battery can be improved, the cycle performance of the battery is improved, and the battery is ensured to have relatively high volume energy density.

The invention provides a battery self-discharge detection method and device, electronic equipment and a storage medium, and relates to the technical field of batteries, and the method comprises the steps: obtaining voltage change rate sample data and self-discharge historical data of a battery based on battery performance data; based on the voltage change rate sample data and the self-discharge historical data, a voltage change rate standard value of the battery in a target period is determined, and the target period comprises at least two periods with different time lengths; the self-discharge historical data comprises a historical voltage change rate; and according to the actual voltage change rate of the battery and the voltage change rate standard value of the target period, carrying out self-discharge anomaly detection on the battery. According to the invention, the problem of limitation of self-discharge rate detection of the existing battery can be solved in a targeted manner.

The invention discloses an electric two-wheeled vehicle charging method and device with an intelligent fault diagnosis function and a storage medium, and relates to the technical field of electric vehicle charging fault diagnosis, the method has an intelligent fault diagnosis function, various data in the charging process can be monitored and analyzed in real time, potential faults can be recognized in advance, and charging safety and equipment reliability are improved. According to data collected by a sensor network, such as charging state, short circuit fluctuation, leakage current and cable temperature, the system can automatically identify faults such as poor plug contact, micro short circuit, electric leakage and temperature abnormity, generate corresponding fault instructions and timely take measures such as power failure and alarm to prevent accidents. And the self-discharge monitoring function can also judge whether self-discharge abnormity exists in the battery according to battery discharge data, and timely notify a user to overhaul, so that the battery is prevented from being damaged.

The invention discloses an electrolyte for a lead storage battery, a formation charge-discharge process and a preparation method of the lead storage battery, and relates to the technical field of storage batteries. A modified biological bacterium additive is added to a common electrolyte of a battery in production, the activity of the electrolyte is improved, the influence of electrolyte impurities is reduced, and charging voltage value limitation is carried out in a formation charging and discharging process stage to prevent internal electrolyzed water of the battery from being overcharged; therefore, the density consistency and stability of the battery electrolyte are improved, the utilization rate of sulfate ions is improved, the charge-discharge efficiency of the battery is improved, grid corrosion and battery self-discharge of a battery pole plate caused by a cyclic electrochemical action reaction are restrained, and the capacity retention ratio and the cycle life performance of the battery are improved. And a formation charge-discharge process is optimized, so that the battery capacity matching rate and the performance consistency are improved, and the cycle life performance of the battery is improved.

The invention discloses a battery display SOC following correction method and system, and relates to the technical field of power batteries. The battery display SOC following correction method comprises the following steps: S1, acquiring the voltage of a single battery based on a battery management system, judging the current charging and discharging mode of the battery, if the battery is in the charging mode, entering S2, and otherwise, entering S3; and S2, comparing the highest single voltage in the single battery voltage with a first voltage threshold, and if the highest single voltage is smaller than the first voltage threshold, obtaining a real SOC target value and displaying the SOC target value according to the highest single voltage, the single voltage difference and the delta SOC look-up table. According to the method, the problems that when the single batteries are inconsistent or the self-discharge difference is large, but the batteries do not meet the correction condition, the real SOC of the batteries does not accord with the actual state of the batteries at the moment, the real SOC jump is triggered until the charging and discharging tail ends are reached or the correction condition is met when the batteries are fully charged and discharged, and the displayed SOC can be rapidly corrected along with the battery at the moment are solved.

A battery cell and a manufacturing method therefor, a battery, an electrical device, and a pre-lithiated positive electrode sheet and a manufacturing method therefor. The preparation method for the battery cell comprises the steps of: providing a positive electrode sheet, a negative electrode sheet, a separator, an electrolyte, an insulating coating slurry and lithium metal simple substance material; coating the surface of a positive electrode active material layer with the insulating coating slurry, and drying same to form an insulating coating; attaching the lithium metal simple substance material to the surface of the insulating coating so as to obtain a pretreated positive electrode sheet; assembling the obtained pretreated positive electrode sheet, the separator and the negative electrode sheet to obtain an electrode assembly; and assembling the obtained electrode assembly and the electrolyte to obtain the battery cell. Under the function of the electrolyte, the pretreated positive electrode sheet realizes a pre-lithiation reaction by means of a self-discharge effect and forms a pre-lithiated positive electrode sheet. The battery cell has a high initial coulombic efficiency, good cycle performance and good processability.

The invention discloses an energy storage battery pack self-discharge abnormity diagnosis method based on short-time charging data, and belongs to the technical field of battery safety monitoring. In order to overcome the defects that an existing method depends on a complete charging and discharging period and is difficult to adapt to a multi-stage variable working condition scene, multi-stage charging data features are extracted, self-adaptive extraction of multi-working condition features is achieved in combination with an auto-encoder, a data driving model fusing GCN-BiLSTM (Graph Convolution-Bidirectional Long Short-Term Memory) is constructed, and a multi-stage variable working condition scene is obtained. According to the method, the RCC (Remaining Charge Capability) of the single battery is accurately estimated, and the RCC of the single battery is accurately estimated. And finally, on the basis of the size, the distribution and the change condition of each single RCC in the battery pack, the overall inconsistency of the battery pack, the SOC inconsistency of the single batteries and the self-discharge fault can be diagnosed. And a guarantee is provided for safe operation of the energy storage system.

The invention discloses a detection device with a power supply self-compensation function and a compensation method thereof. The compensation method comprises the following steps: detecting whether an external power supply is switched on or not; if the external power supply is switched on, judging whether the power supply voltage of the external power supply is higher than the working voltage threshold of the sensor unit through the low-voltage detection circuit; if yes, the foot voltage control switch is switched on, the under-voltage control switch is not switched on, and an external power supply supplies power to the detector detection part; if the voltage is lower than the threshold value, the undervoltage control switch is conducted and the foot voltage control switch is not conducted, the energy storage unit charging and discharging management circuit supplies power to the energy storage voltage detection circuit to enable the energy storage unit power supply control switch to be conducted, and the power is transmitted to the detector detection component through the power supply management circuit for automatic compensation power supply; and if the external power supply is not switched on, the external power supply control switch is not switched on, and the energy storage unit does not self-discharge to supply power to the sensing unit of the detector detection part. According to the invention, automatic compensation when power supply of the detector detection part is insufficient is realized.

The invention discloses a lithium ion battery positive electrode based on a composite positive electrode active material and a preparation method and application thereof, and relates to the technical field of lithium ion batteries. The composite positive electrode active material comprises the following components: LiMnXFe1-XPO4 (X is greater than or equal to 0.4 and less than or equal to 0.6), LiMn2O4, LiNi0. 8Co0. 1Mn0. 1O2, Li2Al2B2O7 and an LLTO / LLZO composite material. According to the invention, LiMnXFe1-XPO4 and LiMn2O4 are taken as main materials, and various positive electrode active materials such as LiNi0. 8Co0. 1Mn0. 1O2, Li2Al2B2O7 and LLTO / LLZO are compounded to construct a positive electrode active material component. In the use process of the battery, multiple positive electrode active materials are combined for use, so that ion conduction can be improved, internal polarization of the battery can be reduced, Mn < 2 + > dissolution can be inhibited, a positive electrode CEI membrane can be optimized, the effect of reducing self-discharge can be achieved, and the stability of high-temperature circulation can be synchronously optimized.

The invention relates to a water-soluble plumbic acid static storage battery. The battery comprises a battery monomer, the battery monomer comprises an electrode plate, a static electrolyte and a container, the electrode plate is inserted in the electrolyte, the electrolyte comprises water-soluble lead salt, acid and water, and the battery monomer further comprises a lead dissolving agent or a structure extending the bottom end of a negative plate to the position below a positive plate. The lead dissolving agent can provide at least one water-soluble redox couple R oxidation and R reduction, and the redox couple electrode potential meets E theta (Pb < 2 + > / Pb) lt; e [theta] (R oxidation / R reduction) [lt]; e theta (PbO2 / Pb2 +). No diaphragm exists, the electrolyte is in a static state, facilities such as a circulating pump are not needed, lead ions are allowed to migrate under the concentration gradient effect, and meanwhile self-discharge caused by convection shuttling of the lead dissolving agent is greatly reduced. In the charging process, lead and lead dioxide can be flatly deposited on the surface of an electrode and can be completely dissolved in the discharging process, the cycling stability is good, and the components can be kept stable for a long time.

A method for estimating a remaining battery life of a non-rechargeable battery of an Internet of Things (IoT) device. The method includes determining an amount of battery capacity used by the IoT device while the IoT device was operating in an active mode, an amount of battery capacity used by the IoT device while the IoT device was operating in a sleep mode, and an amount of self-discharge of the non-rechargeable battery while the IoT was deployed based on temperatures of environments in which the IoT device was located. The method further includes determining an estimated remaining battery life of the non-rechargeable battery based on an initial capacity of the non-rechargeable battery, the amounts of battery capacity used by the IoT device while the IoT device was operating in the active mode and the sleep mode, and the amount of self-discharge of the non-rechargeable battery while the IT was deployed.

Provided are a secondary battery and an electronic apparatus. The secondary battery comprises a positive electrode sheet, a negative electrode sheet, a separator and an electrolyte, wherein the negative electrode sheet comprises a negative electrode current collector and a negative electrode material layer located on at least one surface of the negative electrode current collector; the negative electrode material layer comprises a negative electrode active material; the negative electrode active material comprises a silicon-carbon composite material; on a plane formed by the direction of length of the negative electrode sheet and the direction of thickness thereof, the minimum value of an interior angle of an outer contour of a particle with a maximum circumscribed-circle diameter of greater than 10 μm in the silicon-carbon composite material is A°; and the thickness of the separator is B μm, where 488≤A×B≤3600, and 4≤B≤25. The secondary battery has good self-discharge performance, charging rate performance and cycling performance.

Provided in the embodiments of the present application are a secondary battery and an electric device. In the secondary battery provided in the embodiments of the present application, the thickness Hc of a positive membrane layer of a battery, the contact angle θ of an electrolyte on a positive current collector, the weighted value a of a dielectric constant of an organic solvent in the electrolyte, and the total lithium-ion concentration M in the electrolyte are controlled, and the following relational expression is satisfied: 0.450≤(cosθ×a) / (M×Hc)≤0.792, so that the prepared secondary battery has lower self-discharge performance and better kinetic performance and cycle performance while meeting the requirement of high energy density.

The invention provides a gravity energy storage scale expansion method, which belongs to the field of electric energy storage such as gravity energy storage and mechanical energy storage, and comprises the following steps: taking a single-machine gravity energy storage system as a minimum standard module capable of independently running, and realizing capacity linear superposition; more than two parallel energy storage driving devices are configured for the same energy storage weight in each standard module to realize stepped increase and decrease of instantaneous power; a central controller receives a power grid dispatching instruction, load prediction data and renewable energy output prediction data in real time, global power requirements are decomposed into charging and discharging tasks of standard modules through a hierarchical control architecture, and a local unit controller executes a weight stroke smooth switching algorithm and a multi-weight synchronous dispatching algorithm. Power output / input is enabled to be continuous without breakpoints; and boosting the electric energy generated by each standard module to a high voltage level matched with the power grid to complete high voltage level networking. The invention has great advantages in the aspects of safety, service life, self-discharge characteristic, overall operation efficiency and the like.

The invention relates to the technical field of battery self-discharge testing, in particular to a zero-impedance-based battery self-discharge testing device and a zero-impedance-based battery self-discharge testing method. The battery self-discharge testing device comprises a connector module; the current detection unit comprises a sampling resistor Rsense and a differential amplification circuit, and the sampling resistor Rsense is connected in series in a current input loop; the differential amplification circuit is in bridge connection with the two ends of the Rsense of the sampling resistor and outputs a voltage signal proportional to the self-discharge current Idischarge current; the input end of the voltage detection unit is connected with the four-wire system voltage test terminal, and the open-circuit voltage VOCV of the battery to be tested is sampled in real time; the controllable voltage source module is used for outputting a dynamic compensation voltage Vapplied which is equal to the sum of VOCV and Idischarg * Rcircit, wherein the Vapplied is equal to VOCV + Idischarg * Rcircit; the controller module is used for calculating the real-time voltage drop of the total impedance Rcircuit of the circuit based on the VOCV and the Idischarge, and dynamically adjusting the output of the controllable voltage source, so that the terminal voltage of the battery to be detected is locked as the VOCV; and when the terminal voltage of the to-be-detected battery is stabilized within the range of VOCV + / -0.0001%, determining that the to-be-detected battery enters a constant potential mode, and continuously recording the current value until the current value is stable.

The invention discloses a battery system self-discharge rate consistency detection method and a related device, and relates to the field of batteries, and the method comprises the following steps: executing a first cycle, namely charging a battery system twice to a first state; standing for a first preset time length, and obtaining a charge state corresponding to each battery cell monomer; controlling the battery system to discharge to a second state to obtain a discharge capacity; and standing for a first preset time length, and obtaining the charge state corresponding to each battery cell monomer. And calculating a first monomer capacity based on the first charge state, the second charge state and the discharge capacity of the battery cell monomer. And executing a second cycle, wherein the second cycle is one more than the first cycle to control the battery system to stand for a third preset duration in the second preset temperature interval. And calculating the self-discharge rate of the battery cell monomer and the self-discharge rate range of the battery system based on the first monomer capacity and the second cycle data. Therefore, whether the self-discharge rate consistency of the battery system reaches the standard or not can be determined.

The invention provides a self-discharge prediction method and device of a battery cell, electronic equipment and a storage medium. The method comprises the following steps: acquiring an initial open-circuit voltage of each battery cell in a target batch of battery cells and a target open-circuit voltage of each battery cell after standing for a target time at a target temperature; based on the target temperature, the target time, the initial open-circuit voltage and the target open-circuit voltage of each battery cell, and the self-discharge prediction model of the target batch of battery cells, screening out a target battery cell from each battery cell; and predicting the self-discharge rate and the open-circuit voltage of the target cell under each temperature condition and each time condition based on the initial open-circuit voltage of the target cell and the self-discharge prediction model. Therefore, according to the self-discharge prediction model constructed according to the change characteristics of the self-discharge rate of the battery cell along with the time and the temperature, the self-discharge type and the self-discharge behavior of the battery cell can be accurately predicted, and the accuracy of battery cell self-discharge prediction is improved.

The application provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises a positive electrode sheet, a separator, a negative electrode sheet and an electrolyte. The positive electrode sheet and the negative electrode sheet are stacked, and the separator is arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet comprises a positive electrode main body part and a positive electrode tab part. The ratio of the long side size to the short side size of the positive electrode main body part is (3-8):1. The negative electrode sheet comprises a negative electrode main body part and a negative electrode tab part. The long side of the negative electrode main body part exceeds the long side edge of the positive electrode main body part by 2-9 mm. The long side of the separator exceeds the long side edge of the negative electrode main body part by 2-10 mm. The electrolyte comprises a solvent. The solvent comprises one or more of dimethyl carbonate and a linear carboxylic acid ester having a structure shown in formula (1). In formula (1), R1 and R2 each independently comprises a C1-C5 alkyl or a halogenated alkyl. The battery monomer has a high energy density, good cycle performance and low self-discharge.

The invention provides a double-phase diaphragm-free zinc-bromine battery electrolyte, a preparation method and application, belongs to the technical field of energy storage batteries, and aims to solve the problems that an organic solvent of an existing double-phase diaphragm-free zinc-bromine battery electrolyte has safety risks, the solubility of active substances is not high, and the service life of the battery is prolonged. And when a specific ionic liquid is used as an organic phase, the bromine fixation function is single. Imidazole bromine salt and zinc bromide are jointly dissolved in water, and an ionic liquid phase and a water phase are formed by adjusting the adding amount of the zinc bromide. The solubility of the bromine species in the ionic liquid phase is far greater than that in the water phase, and the imidazole bromine salt can be complexed with the bromine species to form a polybromine complex, so that the ionic liquid phase can be used as a positive electrode electrolyte of a two-phase zinc-bromine battery. The raw materials of the prepared dual-phase electrolyte all participate in the electrode reaction of the zinc-bromine battery, bromine species are dissolved and fixed in an ionic liquid phase under the condition that other organic solvents or ionic liquid is not introduced, diffusion of the bromine species to a water phase is reduced, and the self-discharge phenomenon of the zinc-bromine battery is reduced. And the preparation method of the electrolyte is simple, greatly simplifies the manufacturing process of the battery, and is easy to popularize and apply.

The embodiments of the present application provide a method, device, storage medium and program product for detecting the self-discharge rate of a battery cell, and relate to the field of battery technology. The method for detecting the self-discharge rate of a battery cell includes: determining a first SOC difference between the SOC value of a battery cell and the SOC value of a reference battery cell when a first detection condition is met; determining a second SOC difference between the SOC value of the battery cell and the SOC value of a reference battery cell and a balanced SOC when a second detection condition is met; determining the self-discharge difference information of the battery cell based on the first SOC difference, the second SOC difference and the balanced SOC; determining the self-discharge rate of the battery cell according to the self-discharge rate test value of the battery cell, the self-discharge difference information of all the battery cells of the battery, or the self-discharge rate test value of the battery cell. The present application improves the accuracy and reliability of the self-discharge rate detection of the battery cell, can improve the stability and safety of the battery cell operation, and enhance the performance and service life of the battery cell.

A method, device, and medium for battery physical self-discharge detection are provided. Related to the field of battery monitoring technology and used to detect whether a battery has physical self-discharge, the present disclosure addresses issues of long testing time and difficulty in implementation with current self-discharge detection practice, provides a battery physical self-discharge testing method, leverages frequency response characteristics of battery physical self-discharge and chemical self-discharge to perform self-discharge detection, and rapidly screens whether the battery has physical self-discharge by monitoring a battery voltage change trend. The testing time is short for determining whether a battery has physical self-discharge. It does not need low-temperature storage, reduces implementation difficulty and cost, and better meets requirements of practical battery self-discharge testing scenarios.

The invention provides a battery, the battery comprises a negative plate, a positive plate and an electrolyte, the negative plate comprises a negative current collector and a negative active layer located on the surface of one side or two sides of the negative current collector, the negative active layer comprises a silicon-based material, and in the negative active layer, the weight ratio of silicon element is 2-45%; the electrolyte comprises difluoroethylene carbonate, fluoroethylene carbonate and a phosphazene compound, and in the electrolyte, the weight ratio of the difluoroethylene carbonate to the fluoroethylene carbonate is 0.002-0.4; the molecular structure of the phosphazene compound comprises cyano groups and phosphorus atoms, and the weight ratio of the phosphazene compound in the electrolyte is 0.1-5%. According to the battery, a firm and flexible SEI film can be formed on the surface of the silicon-based negative electrode, repeated breakage of the SEI film is reduced or even avoided, meanwhile, the concentration of HF can be reduced, the internal short circuit and self-discharge risks of the battery are reduced, and the long-cycle stability and the high-temperature cycle performance are improved.