371 results about "Self-discharge" patented technology

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 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 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 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 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.

The invention provides a lithium metal negative electrode, a battery and a preparation method. Specifically, the lithium metal negative electrode comprises a lithium metal sheet and a first coating located on the surface of the lithium metal sheet; wherein the first coating layer is prepared from MXene modified by polyethylene glycol and-SH. MXene in the first coating has lithium affinity, a conductive network can be formed on the outer side of the lithium metal sheet, and the compatibility of the first coating and the sulfide solid electrolyte can be improved due to the existence of polyethylene glycol and-SH modification, so that the lithium metal sheet can be prevented from being in direct contact with the sulfide solid electrolyte through the first coating; ion conduction is ensured, electron permeation is inhibited, and self-discharge is reduced; in addition, polyethylene glycol enables the first coating to have certain mechanical flexibility, so that the first coating can adapt to volume change in the lithium deposition / stripping process, dendrite growth is inhibited, the cycle life of the battery is prolonged, and the safety of the battery is improved.

The invention belongs to the field of batteries, and particularly discloses a battery positive electrode and a zinc-iodine battery containing the battery positive electrode. The battery positive electrode comprises a positive electrode material layer, and the positive electrode material layer contains a positive electrode material; the positive electrode material contains an active substance and a polar organic catalyst; the polar organic catalyst contains at least one group selected from hydroxyl, carboxyl, aldehyde group, ketone group, ester group, ether group, amino, amide group, nitryl, nitrile group, sulfonic acid group and quaternary ammonium salt. The polar organic catalyst is introduced into the battery positive electrode, the contained polar group can efficiently catalyze the iodine positive electrode four-electron conversion reaction, the reaction kinetics of the battery system is obviously accelerated, the iodine positive electrode capacity multiplication is realized, the complete conversion of I0 / I + can be realized, and the high-voltage platform capacity ratio reaches 50%; and the iodine positive electrode capacity, the rate capability and the self-discharge capacity retention rate of the zinc-iodine battery containing the battery positive electrode are remarkably improved.

The invention discloses a battery self-discharge detection device, and the device comprises a charging module which can be connected with a single battery and can charge the single battery to a preset voltage; the voltage detection module can be connected with the single battery and is used for acquiring the voltage of the single battery in real time; and the control module is respectively connected with the voltage detection module and the charging module, and the control module can control the charging module to carry out compensation charging on the single battery according to the voltage of the single battery and a preset voltage, and determines the self-discharge size of the single battery according to the compensation current of the compensation charging. Because the compensation current itself is a direct response of the self-discharge degree, the control module can determine the self-discharge magnitude according to the magnitude of the compensation current of each single battery, and the detection of the self-discharge magnitude can be realized in a short time.

The invention discloses a lithium ion battery self-discharge screening method and device, a readable storage medium and equipment. A lithium ion battery self-discharge screening method comprises the following steps: setting a standard voltage, and performing formation on activated cells greater than or equal to the standard voltage. And charging the formed battery cell to 95-96% SOC, and discharging the battery cell to a self-discharge test SOC. A first open circuit voltage OCV1 of the electrical core is tested. And aging and standing the battery cell for a first preset duration T1, and testing a second open-circuit voltage OCV2 of the battery cell after aging is finished. And a K1 value is calculated, and the K1 value is equal to (OCV1-OCV2) / T1. K1 value screening and same-tray outlier screening are carried out on the battery cells, and the battery cells larger than a K1 value fixed screening threshold value or a same-tray outlier upper limit value are judged to be unqualified battery cells. The method can improve the screening accuracy and guarantee the delivery quality of the battery.

The embodiment of the invention provides a method and device for manufacturing a battery and a control system. The method comprises the following steps: performing formation treatment on a battery unit; carrying out a self-discharge rate K value test and / or an aging test on the battery unit subjected to the formation treatment so as to enable the voltage of the battery unit to be stable; carrying out direct-current resistance test and capacity test on the battery unit subjected to the self-discharge rate K value test and / or the aging test; carrying out capacity test on the battery unit subjected to the direct current resistance test; and grading the battery units based on the result of the direct current resistance test and / or the result of the capacity test. According to the method, the device and the control system, the service life of a product can be prolonged.

This application discloses a secondary battery and an electrical device, belonging to the field of battery technology. The negative electrode active material in the negative electrode film layer of the secondary battery provided by this application includes a negative electrode active material and a coating layer disposed on at least a portion of the surface of the negative electrode active material. The coating layer has a mesh structure containing polymer fibers, and an inorganic solid electrolyte is disposed in at least a portion of the pores of the mesh structure. Furthermore, the negative electrode binder includes polytetrafluoroethylene (PTFE). This effectively improves the initial coulombic efficiency and cycle performance of the secondary battery, and effectively reduces the self-discharge rate of the secondary battery.

The application discloses a method for screening lithium ion battery self-discharge, comprising the following steps: obtaining N qualified battery cells after formation aging; heating and aging the obtained N battery cells; placing the battery cells after heating treatment for a first standing time, and then performing constant current discharge for a first preset time, wherein the constant current discharge capacity is recorded as a first capacity; performing constant current discharge after the N battery cells are fully charged by constant current and constant voltage, wherein the constant current discharge capacity is recorded as a second capacity; calculating the average value of the capacity attenuation rate of the N battery cells during heating and aging based on the first capacity and the second capacity; beneficial effects: the first capacity ratio screening mainly eliminates battery cells with abnormal chemical self-discharge, the second static voltage drop screening mainly eliminates battery cells with large physical self-discharge, and the third voltage drop screening after dynamic charge and discharge cycles can effectively capture battery cells with weak physical self-discharge that escape in the first voltage drop screening.

A self-discharge screening method for lithium-ion batteries is provided. In the method, a single batch screening objects includes a plurality of trays. Each tray of the plurality of trays includes a plurality of batteries to be screened. Voltage drops per unit time of the plurality of batteries to be screened are measured. Voltage drop screening thresholds of the plurality of trays are determined according to the measured voltage drops per unit time. Unqualified batteries are screened out according to a relative relationship between the voltage drop screening threshold of the tray and the voltage drops per unit time of the plurality of batteries.

The application provides a carbon-based electrode material, a battery and a power utilization device, and the carbon-based electrode material meets the following requirements: a self-discharge curve of the carbon-based electrode material is obtained by performing self-discharge curve processing on the carbon-based electrode material, an initial voltage and a terminal voltage of the carbon-based electrode material are obtained according to the self-discharge curve, and a difference between the initial voltage and the terminal voltage is determined as a first voltage difference; a first transition voltage of the carbon-based electrode material is obtained by fitting the self-discharge curve through a plurality of preset functions, and a difference between the initial voltage and the first transition voltage is determined as a second voltage difference; and a ratio of the second voltage difference to the first voltage difference is greater than a preset ratio of 33.3%. The scheme can fully utilize the self-discharge curve characteristics of the material to screen the carbon-based electrode material, can more accurately screen the suitable carbon-based electrode material, and reduces the self-discharge loss of the selected carbon-based electrode material in actual application.

A battery includes: a housing having a cavity; a battery cell arranged in the cavity, the battery cell including a positive electrode plate, a negative electrode plate, and a separator; and an electrolyte solution filled in the battery cell including fluoroethylene carbonate. A width of the separator is greater than that of the positive and the negative electrode plate. The battery satisfies following relationship: C≥B / 20A+1, where a content of fluoroethylene carbonate in the electrolyte solution is C %, A represents a distance between an edge of the separator and that of an electrode plate on the same side, and B represents a height of the cavity. When the foregoing relationship is satisfied, deterioration of performance of the battery cell caused by insufficient electrolyte solution may be alleviated, thereby improving a value of a self-discharge coefficient k and cycling performance of the battery.

The invention relates to the field of batteries, in particular to a battery. The battery comprises a diaphragm and an electrolyte, the diaphragm comprises a base material layer and a ceramic layer on at least one side surface of the base material layer, the ceramic layer comprises inorganic particles, the inorganic particles comprise an element Al, based on the total weight of the diaphragm, the content a of the element Al is greater than or equal to 12% and less than or equal to 32%; the electrolyte comprises ethyl butyrate, the content of the ethyl butyrate is c1 on the basis of the total weight of the electrolyte, and c1 is larger than or equal to 5% and smaller than or equal to 35%; and a and c1 satisfy 0.2 < = c1 / a < = 2.5. The battery provided by the invention can improve self discharge, and has excellent thermal stability and mechanical properties.

A method for detecting a self-discharge state of a battery pack, a vehicle, and a computer storage medium. The method for detecting a self-discharge state of a battery pack comprises: acquiring charging and discharging data of each cell in a battery pack (S1); generating a dQ / dV curve of each cell according to the charging and discharging data (S2); determining voltage inflection point feature information according to the dQ / dV curve of each cell (S3); and determining a self-discharge state of the battery pack according to the voltage inflection point feature information of each cell (S4).

This application discloses a method, electronic device, and storage medium for screening the self-discharge of batteries. The method obtains a first screening range and a second screening range for screening the battery under test. The first screening range is determined based on a target mapping relationship between the battery's state of charge and its differential voltage, and is used for self-discharge rate screening. The second screening range is determined based on the battery's target battery association information and is used for self-discharge rate consistency screening. If the target self-discharge rate of the battery under test falls within both the first and second screening ranges, the battery is determined to be qualified; otherwise, it is determined to be unqualified. Thus, by changing the determination method of the first and second screening ranges, the screening accuracy of the first and second screening ranges is improved, avoiding multi-stage self-discharge screening of the battery, thereby reducing screening time while ensuring screening accuracy.

The invention discloses a valve control type power storage battery electrolyte and a manufacturing method, the electrolyte is composed of the following components in parts by weight: 2-5 parts of sodium carboxymethyl cellulose, 2-5 parts of PEDOT: PSS, 0.5-1 part of manganese sulfate, 0.005-0.01 part of water-based carbon nanotubes, 2-5 parts of polyvinyl alcohol, 35-50 parts of sulfuric acid and 58-65 parts of deionized water, and all the components have a synergistic effect through precise proportioning; the preparation method comprises the steps of preparing a polyvinyl alcohol solution and a sodium carboxymethyl cellulose solution, dispersing conductive components, mixing to form gel, sulfating, adding manganese salt, curing, defoaming and the like, and process parameters are strictly controllable. Through component optimization and process innovation, electrolyte layering and negative electrode sulfation are effectively inhibited, interface impedance is reduced, the problem of uneven current distribution is solved, and grid corrosion and negative electrode self-discharge are reduced; tests show that the cycle index of the storage battery adopting the electrolyte is remarkably increased, the service life is prolonged, and the electrolyte is suitable for various power devices and standby power supply systems and has outstanding technical advantages and practical value.

The invention discloses a discharging control method, a power module and a charging system, and relates to the technical field of charging, the discharging control method is applied to the power module, the power module comprises a DC / DC conversion circuit, the DC / DC conversion circuit comprises at least one group of resonant power conversion loops, each resonant power conversion loop comprises a first power conversion module and a second power conversion module, the method is performed by a controller, the controller comprising a regulation loop, the method comprising: in the event of a power module shutdown, determining a first phase and a second phase based on a discharge demand; and under the condition that the first power conversion module discharges according to the first phase and the second power conversion module discharges according to the second phase, the first phase and the second phase are adjusted based on the electrical parameters and the adjusting loop, so that the DC / DC conversion circuit discharges normally. Therefore, self-discharge without an external discharge circuit can be realized, the cost and the size are saved, and the capacitor voltage is released through the loss of energy circulation in the circuit.

The present application relates to a kind of ultra-thin b orientation ZSM-5 zeolite molecular sieve membrane, preparation method and application in vanadium oxidation liquid flow battery, belong to liquid flow battery technical field. Low defect density, thin and [0k0] plane out orientation ZSM-5 zeolite separation membrane made of zeolite nanosheet realizes enhanced ion selectivity and ion conductivity, so as to improve battery performance. Therefore, VFB equipped with ZSM-5 zeolite membrane shows excellent vanadium resistance, self-discharge time reaches 116.2 hours, far more than Nafion 212 (45.9 hours). In addition, under 80mA cm ‑2 Current density, the performance of VFB remains stable in 1000 cycles.

The invention discloses a preparation method and application of an H-Fe3O4 (at) C nanorod electrode material with a core-shell structure. Dissolving iron nitrate nonahydrate, urea, ammonium fluoride and other drugs in ultrapure water, immersing the carbon fiber cloth in the precursor solution, and carrying out a hydrothermal reaction; after the reaction is completed, cooling to room temperature, washing and sintering to obtain a Fe3O4 nanorod taking the carbon fiber cloth as the substrate; putting the Fe3O4 nanorod serving as a working electrode into a deposition solution of potassium chloride and a pyrrole monomer, and carrying out a constant-pressure deposition reaction; after deposition is completed, washing and sintering are carried out, and the Fe3O4 (at) C core-shell nanorod is obtained. And finally, carrying out rapid Joule heat treatment to further graphitize the carbon layer, cooling, and taking out to obtain the H-Fe3O4 (at) C nanorod. The H-Fe3O4 (at) C nanorod is used as a negative electrode to assemble the asymmetric supercapacitor, the capacitance retention rate of the supercapacitor is 93.7% after 25000 cycles of charge and discharge, the capacitance retention rate is far higher than that of most current pseudocapacitance supercapacitors, and the self-discharge rate of the capacitor is inhibited while good electrochemical stability is achieved.

A self-discharge screening method and a self-discharge screeningapparatus for lithium-ion batteries. High-temperature standing, first room-temperature standing, and second room-temperature standing are performed on batteries to be tested. Screenings are performed on the batteries to be tested according to process parameters of the first standing and the previous two periods of standing. Physical self discharge rates of the remaining batteries to be tested are determined according to the process parameters of the three periods of standing, and physical self-discharge screening is performed. The physical self-discharge rates of the batteries to be tested are determined by using the state parameters, and batteries with non-obvious type physical self-discharge abnormalities are screened out.

The invention discloses a battery self-discharge screening method. The method comprises the following steps: respectively acquiring compensation currents required for maintaining voltages of a plurality of single batteries at preset voltages; and according to the plurality of compensation currents, determining outlier single batteries, and taking the outlier single batteries as single batteries with abnormal self-discharge. The compensation current itself is a direct reaction of the self-discharge degree, so that the battery monomer of which the self-discharge degree is greatly different from the self-discharge degree of other battery monomers can be determined according to the magnitude of the compensation current of each battery monomer, and the battery monomer is used as the battery monomer of which the self-discharge is abnormal; according to the invention, the single battery with abnormal self-discharge can be determined in a short time, the cycle of battery self-discharge detection is shortened, and the detection efficiency is improved.

The invention discloses positive electrode slurry, a preparation method, a positive plate and a battery, and relates to the technical field of battery preparation. The positive electrode slurry comprises the following components in parts by mass: 30-40 parts of barium titanate powder; 3.5 to 7.0 parts of a binder; 0.5 to 6 parts of a dispersant; and 0.05 to 0.3 part of other additives. And the balance of solvent. The barium titanate powder is used as a main material and is coated on the surface of the positive plate through a specific formula and process, so that short circuit can be prevented when a diaphragm fails, excellent electrochemical performance of the battery can be maintained, and the slurry can promote formation of a CEI film, reduce self discharge, improve the safety of the battery and prolong the cycle life of the battery.

The application provides an electrochemical device and an electronic device, wherein the electrochemical device comprises a positive electrode sheet, a negative electrode sheet and a porous separator layer between the positive electrode sheet and the negative electrode sheet; by using infrared spectrum testing, the porous separator layer has a first absorption peak in the range of 835 cm ‑1 to 845 cm ‑1 , a second absorption peak in the range of 760 cm ‑1 to 770 cm ‑1 , and the peak height I1 of the first absorption peak and the peak height I2 of the second absorption peak satisfy I1>I2. The electrochemical device has low self-discharge and high safety.

The application provides a battery self-discharge screening method and device, electronic equipment and storage medium. The full battery to be screened is subjected to at least two high-temperature aging operations, and a first open circuit voltage is obtained. Any two of the at least two high-temperature aging operations comprise a power compensation operation on the battery to be screened. In the case that the first open circuit voltage is higher than a first open circuit voltage standard value, the battery residual capacity of the battery to be screened is adjusted to a preset proportion of the total capacity of the battery. The battery to be screened is subjected to a self-discharge operation, and at least two second open circuit voltages of the battery to be screened in the self-discharge operation are obtained. Based on the at least two second open circuit voltages, a screening result of the battery to be screened is obtained. Through the power compensation on the battery to be screened, multi-stage high-temperature aging is realized. Through the adjustment of the residual capacity of the battery to be screened, the screening result of the battery is obtained based on the open circuit voltage after the self-discharge, the differential pressure monitoring under a specific SOC is realized, and the misjudgment rate of the battery is reduced.

To provide a storage battery control system capable of obtaining a larger power transaction profit while an aggregator remotely controls storage batteries of a plurality of consumers.SOLUTION: In this storage battery control system, an aggregator 4 remotely controls the operation of a storage battery 21 in a consumer's facility 2 having a solar cell 20 and the storage battery 21, and the aggregator 4 performs a first mode in which reverse power flow discharge is performed when a power market value is higher than a threshold value and reverse power flow discharge is not performed when the power market value is not higher than the threshold value, and a second mode in which when a power generation amount of the solar cell 20 exceeds a personal consumption amount, the surplus power is stored in the storage battery 21, and when the power generation amount of the solar cell 20 is insufficient, the surplus power is compensated by personal discharge from the storage battery 21. The second mode is performed in a time zone in which the solar battery 20 generates power, and the first mode is performed in other time zones.SELECTED DRAWING: Figure 2

The utility model discloses a portable lighting lamp, including shell, electrically conductive part, battery and electric connection piece. One end of shell is equipped with the lamp holder, and the other end is equipped with the plug, is equipped with a rotating part on the plug. Electrically conductive part is composed of annular body and multiple rod bodies. Rotating the rotating part, the electric connection piece is pushed through the rotating part, and the electric connection piece is kept stress deformation and contacts the annular body. The portable lighting lamp can control the battery to realize the electricity connection between the electric connection piece and the electrically conductive part through the rotating part, is simple to use, and the operation is simple, and the rotating part can be rotated to cut off the electricity connection between the battery and the lamp holder when not using for a long time, can avoid the battery leakage and the self-discharge phenomenon of battery when not using for a long time, prolongs the service life of battery.

This invention relates to the field of new energy battery technology and discloses an equivalent circuit model suitable for aqueous zinc-ion batteries. This model maps the core chemical degradation process of aqueous zinc-ion battery cathode material dissolution and structural collapse into the dynamic changes of two key electrical parameters: actual maximum capacity decay and actual ohmic internal resistance growth. By constructing explicit mathematical relationships such as stress functions, capacity decay equations, and internal resistance growth equations, it achieves quantitative coupling between chemical degradation and changes in electrical parameters, effectively improving the estimation accuracy of battery operating states such as state of charge and health. Simultaneously, the instantaneous electrical behavior model in the model, by adding an RC self-discharge branch connected in parallel with the controlled voltage source, can quantify the impact of parasitic reactions such as hydrogen corrosion and negative electrode interface passivation on battery open-circuit voltage drift and energy loss, solving the problem of low prediction accuracy under long-term storage and low-rate conditions caused by neglecting parasitic reactions in traditional models.