2011 results about "Self-discharge" patented technology

Non-aqueous alkali metal (e.g., Li)/oxygen battery cells constructed with a protected anode that minimizes anode degradation and maximizes cathode performance by enabling the use of cathode performance enhancing solvents in the catholyte have negligible self-discharge and high deliverable capacity. In particular, protected lithium-oxygen batteries with non-aqueous catholytes have this improved performance.

In activated carbon obtained by subjecting a carbonaceous material to an activation treatment, the overall content of alkali metals is set at 100 ppm or less, or the overall content of heavy metals is set at 20 ppm or less and the overall content of alkali metals is set at 200 ppm or less. In cases where such activated carbon is used as a raw material in electronic devices, the formation of dendrites by the reductive deposition of alkali metals or heavy metals tends not to occur, so that problems such as short-circuiting or the like tend not to arise, and a good rate of self-discharge retention is shown.

The present invention discloses a backlight including external electrode fluorescent lamps and a method for driving the backlight. The backlight includes fluorescent lamps having external electrodes made of an electrically conductive material for wrapping the outer peripheral surfaces including edge cross-sections on both ends of a glass tube with a layer of fluorescent substance applied thereon. The backlight is constructed in a manner that a plurality of such fluorescent lamps are installed at the outer portions of a plastic light guide, and an alternating current type power source is applied from the outside to the fluorescent lamps by installing a plurality of the fluorescent lamps between a reflecting plate and a diffusing plate and electrically connecting them with one another. The backlight of the present invention is driven by a square wave from a switching inverter, and is characterized by the use of an overshooting waveform and a self-discharge effect favorable to an initial discharge, thereby driving it using a low frequency of several dozen kHz and thus realizing high luminance and high efficiency.

A system for counteracting self-discharge in a storage battery is provided. The system includes a charge supply battery that provides a supply voltage. The system also includes a DC-DC converter circuit that has an input that electrically couples to the charge supply battery and an output that electrically couples to terminals of the storage battery. The DC-DC converter circuit provides a charging voltage at the output that has a magnitude greater than a magnitude of the supply voltage. The storage battery is a carbon battery.

The invention provides a backup lithium ion battery pack management method and a management system thereof. The method comprises the following steps: real-time data sampling, running state identification and electric quantity estimation, intelligent charging management and discharging management, self-discharge power consumption management, heating management, alarm and security protection. The cell management system comprises a power supply unit, a data acquisition unit, a storage unit, a micro control unit (MCU), a state indication unit, an equalization unit, a heating unit, a switch unit and a communication unit. The method and the system are aimed at seamlessly connecting a lithium ion battery to various present backup power supply systems, and according to working condition characteristics of various backup power supplies, a lithium ion battery pack always maintains sufficient energy in a long time energy storage reserve supply period and maintains an enough long reserve supply time in reserve supply output.

The invention discloses a novel detection method for self-discharge characteristics of lithium iron phosphate system power lithium ion batteries. The method comprises the following steps: step 1, charging and discharging batteries, and adjusting SOC (System On Chip) states of the batteries to be 20-40%; step 2, standing for a certain period of time at normal temperature, and measuring open-circuit voltage (OCV)1 of the batteries; step 3, performing high-temperature aging on the batteries; step 4, standing for a certain period of time at normal temperature, and then detecting OCV2 of the batteries; step 5, calculating a voltage drop deltaU of the batteries, wherein deltaU is equal to OCV1-OCV2; and step 6, calculating an average value and standard deviations of the voltage drops of the same group of batteries, determining a self-discharge detection standard of the batteries, and screening. The method for detecting the self-discharge characteristics of the batteries by virtue of voltage differences of the batteries disclosed by the invention can be used for well shielding interference of factors such as equipment, operations and environment temperature existing in a manufacturing process of the batteries in the self-discharge data acquisition accuracy of the batteries, so that the self-discharge characteristic data distortion of a single battery can be avoided, the matching reliability of the batteries can be effectively improved, and the cycle life of a battery pack can be prolonged.

A rechargeable battery, battery set or battery pack having a circuit or a plurality of circuits for providing self-discharging thereof electrically connected in parallel are used to form rechargeable battery assemblies and electric power supply systems for use in electric and hybrid vehicles and the like.

A lithium secondary battery includes: an electrode body having a positive electrode, a negative electrode, and a separator, the positive electrode and the negative electrode being wound or laminated by means of the separator; and a nonaqueous electrolyte solution containing a lithium compound as a electrolyte. At least one of the positive electrode, the negative electrode, the separator, the nonaqueous electrolyte solution contains at least one of: (a) an organic and/or inorganic inhibitor, which functions as a Cu-corrosion inhibitor or a Cu-trapping agent, (b) a compound having an organic base and an inorganic acid which are unitarily combined in a molecule, (c) a cyclic compound containing a N-O radical in a molecular structure, (d) a cyclic compound which becomes a Mn<2+> supplier in the nonaqueous electrolyte solution, (e) a compound containing an atom showing Lewis acidity and an atom showing Lewis basisity in one molecule, (f) a three-dimensional siloxane compound, and (g) a nonionic surfactant; or the nonaqueous electrolyte solution contains: (h) a water-extracting agent, or (i) a hydrofluoric acid-extracting agent. This lithium secondary battery exhibits an excellent effect that self-discharge property, cycle characteristics, long period stability and reliability can be planned.

The invention relates to a screening grouping method of echelon utilization type lithium batteries, and belongs to the technical field of determination of parameters of the lithium batteries. According to the technical scheme, the screening grouping method of the echelon utilization type lithium batteries comprises the following steps: testing and calculating so as to obtain a battery dQ/dV-V curve, analyzing ageing reasons of return power batteries by adopting an ICA (Incremental Capacity Analysis) method, and firstly rejecting the return power batteries, negative active materials of which are lost; testing to obtain the capacities, ohmic internal resistance, polarization internal resistancs and self-discharge values of the echelon utilization type lithium batteries, and screening the batteries according to indexes; and regrouping the screened batteries. The screening grouping method of the echelon utilization type lithium batteries has the beneficial effects that serious declining batteries are rejected by screening the echelon utilization type lithium batteries so as to ensure that the echelon utilization grouping property of the batteries is not affected by individual damaged battery; the batteries which are similar in terms of capacity, ohmic internal resistance and polarization internal resistance are clustered together by using a weighting k-means clustering method, and due to the setting of weights, the capacity utilization rate of a battery group is ensured; the forming consistency of the echelon utilization type lithium batteries can be improved, and the service life of the echelon utilization type lithium batteries is prolonged.

A nickel-metal hydride secondary battery comprising electrode group comprising positive electrode comprised mainly of nickel hydroxide, negative electrode comprised mainly of a hydrogen storage alloy, and separator being disposed between the positive electrode and the negative electrode, wherein the electrode group is sealed in battery casing, together with an alkali electrolyte liquid, wherein, in the battery, a W element and an Na element are present simultaneously. The nickel-metal hydride secondary battery of the present invention is advantageous not only in that it exhibits high utilization of the active material and excellent self-discharge characteristics in a high temperature storage as well as high charging efficiency in a high temperature environment, but also in that it has excellent large current discharge characteristics.

The invention discloses a self-discharge screening method for a lithium ion phosphate battery, belongs to the technical field of lithium ion batteries, and aims to provide a method for effectively screening the lithium ion phosphate battery with high self-discharge rate by using shelving in a charging state. According to the technical key points, the method comprises the following steps of: adding laminar lithium nickel cobalt manganese oxide or spinel lithium nickel manganese oxide which comprises 0.5 to 5 weight percent of lithium ion phosphate and has high voltage platform into a lithium ion phosphate-containing compound positive electrode; assembling the lithium ion phosphate battery by taking graphite as a negative electrode; fully charging the battery and then shelving the battery at an ambient temperature of between 20 and 45 DEG C; recording voltages before and after the shelf and shelf time; calculating the voltage difference before and after the shelf or a voltage variation value in unit time; and determining a critical value of the voltage difference of the batteries with the high self-discharge rate which are shelved in the same period or voltage variation in the unit time, and determining that the self-discharge rate of the battery of which the voltage difference or the voltage variation value in the unit time is greater than the critical value is high.

Disclosed is a 600HB-grade wear resistant steel plate, comprising, by weight, 0.41 to 0.50% of C, 0.10 to 0.60% of Si, 0.20 to 1.20% of Mn, no more than 0.050% of P, no more than 0.030% of S, 0.01 to 1.50% of Cr, 0.01 to 1.00% of Mo, 0.01 to 1.50% of Ni, 0.001 to 0.10% of Ti, 0.001 to 0.10% of Al, 0.001 to 0.10% of RE, 0.01 to 1.00% of W, 0.0005 to 0.0040% of B, 0.001 to 0.010% of Ca, the balance Fe and unavoidable impurities. The 600HB-grade wear resistant steel plate provided in the invention has high hardness (no less than 600HB), good toughness and plasticity, high abrasion resistance and excellent processability and weldability; the microstructure is martensite or martensite and retained austenite. Therefore, the 600HB-grade wear resistant steel plate is extremely suitable for being used in high abrasion environment, especially for being used in vehicles or equipment which contact with such materials of high hardness as high strength ores, for example, a bucket, or the compartment of an electric wheel self-discharging truck for mining, etc.

The invention relates to an estimation and implement method of state of charge (SOC) of battery for electric car, belonging to the field of electric car intelligent niformation processing technology. Said method utilizes the state space equation of battery which is formed from battery charge state equation based on ampere-hour metering method and measurement equation of battery load votlage, and uses the improved extended Kalman filtering equation to calculate and obtain the stale of charge of battery. Said invented advantage lies in that it has stronger adaptability, can eliminate initial error of SOC, and can raise the convergence of error or reduce speed, at the same time it can modify the change of SOC resulted frmo self-discharge of battery. Said invention is applicable to SOC estimation of cell monomer, module and battery.

The invention discloses a method for evaluating self-discharge consistency of a lithium iron phosphate battery. The method mainly comprises the following steps of: measuring open circuit voltage after the battery is charged and open circuit voltage after the battery is laid at high temperature under the conditions of constant voltage and constant current; calculating the voltage drop of the battery, a mean value and a standard difference; and determining the upper control limit of the voltage drop to determine that the battery has high self-discharge consistency under the condition that the voltage drop does not surpass an upper specification limit. By the method for evaluating the self-discharge consistency of the lithium iron phosphate battery, evaluation accuracy, high production operability and obvious practical meaning are achieved, and the grouping consistency of the lithium iron phosphate battery is effectively improved.

The invention relates to the technical field of storage battery state of charge prediction, and discloses an on-line feedback battery state of charge (SOC) predicting method. According to the method, SOC valuation model parameters are corrected according to historical data in the on-line operating process of a storage battery. The influence of temperature, coulomb efficiency and self discharge on battery SOC is considered, basic operating parameters of the storage battery are only required to be monitored, related coefficients are corrected as long as conditions are met in the operating process of the battery, coefficient values are repeatedly corrected, and an SOC estimation result is close to a true value along time, so the accuracy is high and the storage battery SOC can be predicted on line.

In order to combine improved self discharge characteristics and high reliability under high temperatures, an electric double layer capacitor includes a unit cell or a plurality of stacked unit cells in which each unit cell has a porous separator impregnated with an electrolyte solution, a pair of polarizing electrodes provided on both sides of the porous separator, collectors provided in contact with the external surfaces of the polarizing electrodes, and a gasket provided to seal the electrolyte solution contacting the polarizing electrodes and the porous separator. The porous separator includes two porous separator elements that each have different porosities and that are laminated together.

The invention discloses a battery charge state detecting method. The method comprises the steps that the initial SOC of a battery is determined; the self-discharge effect of the battery is considered; a table look-up method is used to accurately estimate the SOC of the battery; an ampere-hour integral method is used to acquire the SOC estimation value of the battery of a next moment; a battery Thevenin model is combined, and an extended Kalman filter algorithm is used to correct the SOC of the battery; and finally, low power, over-current, over-temperature and the like of the battery are judged to carry out early warning and protection. According to the method provided by the invention, the influence of self-discharge of the battery on the battery capacity and the influence of temperature, the number of times of cycle charge and discharge and charge and discharge current on the rated capacity of battery are comprehensively considered, wherein self-discharge of the battery is caused by first time of running and downtime of the battery; error correcting is carried out on the SOC of the battery; and the accuracy is improved.

The invention discloses a lithium secondary battery consistency screening method, belonging to the field of secondary batteries, characterized in that: a unit battery grades the capacity, platform, and internal resistance when conducting capacity grading and detection, and then the unit battery is charged by multi-step constant current and constant voltage, wherein a constant current of 0.3-5C5 is used for charging to a voltage V0, when the charging current is 0.1-0.3 C5, the charge is stopped and the battery is shelved; after the battery is shelved for 5-30 min, the charging is continued with a constant current of 0.1-0.3 C5 to the voltage V0, when the charging current is 0.05-0.1 C5, the charge is stopped and the battery is shelved; after the battery is shelved for 5-30 min, the charging is continued with a constant current of 0.05-0.1 C5 to the voltage V0, when the charging current is 0.03-0.05 C5, the charge is stopped and the battery is shelved; after the battery is shelved for 5-30 min, the charging is continued with a constant current of 0.03-0.05 C5 to the voltage V0, when the charging current is 0.01-0.03 C5, the charge is stopped; after the charging is complete, the unit battery is shelved at a normal temperature, the shelving time is no less than 24h, when the shelving ends, measurement is carried out on the open-circuit voltage Vt of the unit battery, if the open-circuit voltage Vt is no less than the result of V0 minus delta V0 and minus n*delta V, the unit battery is qualified. According to the invention, the qualified unit battery screened by the invention has low self-consuming hazards, the combined battery pack has good self-discharge consistency, high reliability, and rapidness, simpleness and easy operation in practical application, and has a good market application prospect.

The invention discloses a self-discharge detection method of a lithium iron phosphate battery. Charging and discharging pretreatment is carried out on lithium iron phosphate batteries after capacity sorting processing; the batteries are placed for standing for some time respectively in different temperature environments and open-circuit voltages OCV1 and OCV2 are tested; a difference value K between the OCV1 and the OCV2 is calculated; and according to the K value, a battery with a high self-discharge value is determined and selected. According to the invention, the electrode polarization is eliminated by pretreatment, so that the influence on the voltage by polarization and unstable system factors can be minimized; and the battery with the high self-discharge value can be screened out rapidly in short time before grouping. The test is accurate and effective; the product quality is substantially improved; and the consistency of the whole group of batteries can be prevented from being influenced by the battery with the high self-discharge value. Therefore, the service life of the battery group can be prolonged.

The invention provides a fuel cell and lithium ion battery hybrid system, which comprises a fuel cell subsystem, a lithium ion battery subsystem, a charge control subsystem, an intelligent hybrid power management system, a motor and a motor control system. A fuel cell serves as a main operation power source while a lithium ion battery serves as an auxiliary power source. The problems that the fuel cell of the pure fuel cell automobile is short in service life and the energy is unrecyclable can be solved, and the problems of long charge time, potential burning and explosion in continuous high-current discharge, attenuation and self discharge of the pure lithium ion battery electric vehicle are also solved. Service lives of the fuel cell and the lithium ion battery are effectively prolonged, the cost of the power system is reduced, reliability and safety are improved, energy recovery is realized, and accordingly the fuel cell and lithium ion battery hybrid system is an excellent solution to the power source problem of electric vehicles.

The invention relates to a flow battery. The flow frame boards of the flow battery are provided with liquid inlet holes and liquid outlet holes; the front surfaces of the flow frame boards are provided with liquid inlet branch flow channels and liquid outlet branch flow channels; one end of each liquid inlet branch flow channel is communicated with the liquid inlet holes, and the other end thereof is communicated with the inner frames of the flow frame boards; one end of each liquid outlet branch flow channel is communicated with the liquid outlet holes, and the other end thereof is communicated with the inner frames of the flow frame boards; the flow frame boards are alternately arranged according to a mode of front surface to front surface and back surface to back surface in sequence; an ion exchange film is clamped between the opposite front surfaces of the adjacent flow frame boards; a current-conducting plate is clamped between the opposite back surfaces of the adjacent flow frame boards; the edge of the inner frame of each flow frame board is provided with an annular chamfer; the current-conducting plate is arranged on the annular chamfer; and electrodes are arranged in the inner frames of the flow frame boards. The flow battery has fewer components, simple and compact structure, easy processing, convenient assembly, small thickness, small volume, small internal resistance, good transfer and diffusion effect of electrolyte, small self discharge current, big power density, high energy efficiency and low cost and can realize big-power and large-scale application.

The invention relates to a cluster analysis based lithium battery unit matching method which comprises the following steps of: (1) classifying battery units according to the types and the rated capacities of batteries, dividing the batteries with the same type and rated capacity in a group, and then furthering matching all battery unit sets with more than one battery unit; (2) selecting more than one factor combination of health status, self-discharge rate, internal resistance, open-circuit voltage, charging efficiency and cycle index for matching the battery unit sets; and after classification, completing matching of all battery unit sets with more than one battery unit, or further matching. The cluster analysis based lithium battery unit matching method can be used for comprehensively estimating all factors influencing the performance of the batteries, thus improving the consistency of the initial performance of the batteries; abd meanwhile, the probability of battery performance mutation in the using process of the batteries can be effectively reduced, the service efficiency of the battery units can be improved, and the service life of groups of battery units can be prolonged.

The invention provides a preparation method for a coating anode material of a lithium battery. The preparation method comprises the following specific steps: (1) weighing a coating material and monomer sulfur; weighing the coating material and the monomer sulfur according to a mass ratio, wherein the mass ratio of the coating material to the monomer sulfur ranges from 1:1 to 1:100; (2) preparing a dispersion solution of the sulfur: dissolving the monomer sulfur into a sodium polyacrylate water solution with the mass percentage of 2%-10% at a room temperature to obtain the dispersion solution of the sulfur; (3) preparing a dispersion solution of the coating material: dissolving the coating material into a surfactant water solution at 20-45 DEG C to obtain the dispersion solution of the coating material; and (4) preparing the coating anode material of the lithium battery. According to the preparation method for the coating anode material of the lithium battery, self discharge of the battery is reduced effectively and the stability of the structure in a charging/discharging process of a sulfur electrode is kept; a sulfur active material prepared by the preparation method is used as a lithium-sulfur secondary battery anode material and the prepared lithium material has a high specific discharge capacity and a good circulating performance.