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2651 results about "Discharge efficiency" patented technology

The Charge/Discharge efficiency is the ratio of the energy you can take out of a battery divided by the energy you put in. Example figures here... http://large.stanford.edu/course...

Coal mine down-hole drilling hydraulic fracturing anti-reflection mash gas extraction technique

The invention relates to a hydraulic fracturing anti-reflection technology for pumping and exploring gas by drilling a hole in a coal mine well, comprising the following steps sequentially: (1) selecting a fracturing location; (2) determining the pressure type according to observed coal type, laneway arrangement and construction development degree, and ways of top soleplate bedding plane borehole hydraulic fracturing, top soleplate translamellar borehole hydraulic fracturing, the coal bed bedding plane borehole hydraulic fracturing or the coal bed translamellar borehole hydraulic fracturing can be adopted; (3) determining borehole parameters for constructing drilling, wherein, the borehole parameters include borehole length, borehole height, aperture, obliquity angle and azimuth angle; (4) designing the hydraulic fracturing, including injected water volume and injection pressure; (5) borehole washing; (6) draining; (7) examining the fracturing effect, if the fracturing effect is in accordance with the requirement, the following step is carried out, if not, turning to step (4); and (8) entering a pipeline for pumping and discharging. The technology enhances the air permeability of the coal bed, reduces the gas emission rate of an excavation working face, and obviously promotes the pumping and exploring capability and the pumping and exploring effect of the single borehole. The pumping and discharging efficiency is improved, the pumping and discharging time is shortened and the damage of the gas is maximally eliminated.
Owner:HENAN POLYTECHNIC UNIV

Dynamics battery-super capacitance mixed dynamic system for electric car

The invention relates to a power battery-super capacitor hybrid power system for electric automobiles, belonging to the electric automobile technical field. The power battery-super capacitor hybrid power system for the electric automobiles comprises a power battery pack, a motor controller and a 24V storage battery, a boost DC /DC converter, a bi-directional DC/DC converter and a super capacitance group, wherein, the low voltage end of the boost DC /DC converter is connected with the output end of the power battery pack, the high voltage end of the boost DC /DC converter is connected with the motor controller; the super capacitance group and the high voltage end of the bi-directional DC/DC converter are directly hitched with the high voltage end of the boost DC/DC converter, and the low voltage end of the bi-directional DC/DC converter is connected with the 24V storage battery. The power battery of the power battery-super capacitor hybrid power system for the electric automobiles has smooth output current, small peak current, high discharge efficiency and long service life; when the battery pack SOC is lower, the hybrid system still ensures the normal power output capability; and the super capacitance can directly absorb the braking feedback energy and has high energy conversion efficiency.
Owner:TSINGHUA UNIV

Synthesis and surface modification method of lithium excessive laminar oxide anode material

The invention relates to a synthesis and surface modification method of a lithium rich anode material Li1+xM1-xO2 (M is one or more of Ni, Co and Mn, and X is more than or equal to 0 and less than or equal to 1/3) for a lithium ion battery. The method comprises the following steps of: synthesizing a precursor by using a carbonate precipitation method, mixing the precursor and a lithium salt, and calcining for 2 to 20 hours at the temperature of between 800 and 1,100 EG C to obtain a lithium rich material, wherein the prepared lithium rich material has controllable particle size and higher reversible capacity; and dissolving persulfate or sulfate in an amount which is 5 to 80 mass percent of the lithium rich material into deionized water, adding the lithium rich material, stirring for 2 to 100 hours at the temperature of between 25 and 80 DEG C, heating the materials to the temperature of between 100 and 500 DEG C in a muffle furnace, calcining the materials for 2 to 20 hours, fully filtering the obtained materials, and washing off impurities to obtain the surface modified anode material Li1+x-yM1-xO2. The synthesized lithium rich material has controllable particle size; the first charge/discharge efficiency of the lithium rich material and the discharge specific capacity and the cyclical stability under high magnification can be improved; and the method is simple, low in cost, convenient for operation and suitable for industrialized production.
Owner:GUANGZHOU HKUST FOK YING TUNG RES INST

Preparation and application of lithium battery silicon-carbon composite material taking synthetic graphite as carrier

ActiveCN103346305AImprove integrity and compactnessSmall apertureCell electrodesCarbon sourceCarbon composites
The invention provides preparation and application of a lithium battery silicon-carbon composite material taking synthetic graphite as a carrier. The preparation method comprises the following steps of: dissolving nanometer silicon and synthetic graphite in a dispersant to obtain a uniform dispersion liquid, adding an organic carbon source, stirring uniformly to obtain a mixed liquid, feeding the mixed liquid into a closed circulation spray dryer to prepare composite precursor powder, pre-sintering for 3-10 hours at the temperature of 300-700 DEG C to obtain a silicon-carbon composite material subjected to primary carbon cladding; and further dissolving the silicon-carbon composite material subjected to primary carbon cladding with the organic carbon source in a dispersant, stirring to obtain a uniform mixed liquid, feeding the uniform mixed liquid into a second closed circulation spray dryer to prepare composite powder, and heating the powder for 6-18 hours at the temperature of 700-1000 DEG C, so as to obtain the lithium battery silicon-carbon composite material taking synthetic graphite as a carrier. The lithium battery silicon-carbon composite material prepared by the invention shows such excellent electrochemical properties as high first charge-discharge efficiency, high specific capacity and good cycle performance after being applied to a lithium battery.
Owner:中国有色桂林矿产地质研究院有限公司

Method for testing net energy of electrical vehicle power battery

The invention discloses a method for testing net energy of an electrical vehicle power battery, which comprises the following steps of: charging a battery set in a state of discharging stop voltage to the state of charging stop voltage, recording the charged energy, discharging the battery set to a pre-set SOC by the stated current, recording the energy discharged at the first time, and then performing a working situation circulation test to the electrical vehicle, discharging the battery set to the discharging stop voltage by the stated current when the test is finished, recording the energy discharged at the second time, obtaining the energy change amount of the battery in the working situation circulation test according to the average charging and discharging efficiency of the battery set, correcting the energy change amount of the battery in the working situation circulation test according to the battery charging and discharging energy efficiency models, and obtaining the energy actually stored by the battery in the working situation circulation process, namely the battery net energy. The method considers the effect to battery net energy of charging and discharging efficiencies on one hand with high testing accuracy, and only tests the charging and discharging energies of the electrical vehicle before and after the test on the other hand, which is easy to be realized.
Owner:WUHAN UNIV OF TECH +1

Electric power storage system using capacitors and control method thereof

InactiveUS20090134851A1High voltageSignificantly affecting the charging/discharging characteristicsHybrid capacitorsParallel/serial switchingDischarge efficiencyElectricity
In an electric power storage system according to the present invention, in the case of charging, a plurality of capacitors of each circuit block of the electric power storage system are switched to a serial connection to initiate the charging. When the output voltage of power storage means reaches the maximum input voltage of DC-AC conversion means, each capacitor of a number j of circuit blocks is switched to a parallel connection in order of higher block voltage. Also up to the time when the maximum input voltage is reached again, each capacitor of a number j of circuit blocks is switched to a parallel connection in order of higher block voltage. In the case of discharging, pluralities of capacitors of each circuit block of the electric power storage system are switched to a parallel connection to initiate the discharging. When the output voltage of power storage means reaches the minimum input voltage of DC-AC conversion means, each capacitor of a number k of circuit blocks is switched to a serial connection in order of higher block voltage. Also up to the time when the minimum input voltage is reached gain, each capacitor of a number k of circuit blocks is switched to a serial connection in order of higher block voltage. Accordingly, the electric power storage system is hardly affected by the capacitance error of the capacitors, and charging / discharging efficiency can be improved.
Owner:LIMITED COMPANY TM

Negative electrode material for quickly rechargeable graphite lithium-ion battery and preparation method of negative electrode material

The invention discloses a negative electrode material for a quickly rechargeable graphite lithium-ion battery and a preparation method of the negative electrode material. The preparation method of the negative electrode material for the quickly rechargeable graphite lithium-ion battery comprises the following steps: (1) mixing a mixture containing a graphite precursor and bitumen and heating the mixture for kneading and crushing, wherein the mean grain size D50 of the graphite precursor ranges from 5 to 10 microns, and the mass ratio of the graphite precursor to the bitumen ranges from 50:50 to 90:10; (2) performing heat treatment at a temperature within the range of 300-700 DEG C under the protection of an inert gas; and (3) carrying out graphitizing. The mean grain size D50 of the negative electrode material prepared by use of the preparation method for the quickly rechargeable graphite lithium-ion battery is within the range of 5-15 microns and the specific surface area of the negative electrode material is below 2.0m2 / g; the first discharge capacity of a negative electrode, manufactured by use of the negative electrode material for the quickly rechargeable graphite lithium-ion battery, is more than 355mAh / g, and the initial charge-discharge efficiency of the battery is above 90%; if the battery is quickly charged (1.5C) for 45 minutes, the capacity of the battery can be above 80%; in short, the product is high in discharge capacity and charge / discharge efficiency, and good in rate capability. The invention also relates to a battery comprising the negative electrode material for the quickly rechargeable graphite lithium-ion battery.
Owner:SHANGHAI SHANSHAN TECH CO LTD

Preparation method of asphalt liquid phase coated modified artificial graphite lithium battery cathode material

The invention provides a preparation method and an application of an asphalt liquid phase coated modified artificial graphite lithium battery cathode material. The method comprises the steps of mechanically grinding petroleum coke, mixing with an appropriate amount of (3-8%) asphalt powder after stage treatment, performing reaction for 6-10h in a moderate temperature reaction kettle at 500-650 DEG C, performing reshaping stage treatment again, performing reaction for 36-72h at 2400-3000 DEG C for high-temperature graphitization treatment, finally obtaining an unmodified artificial graphite material through stage treatment, then further dissolving the unmodified artificial graphite material and asphalt in a dispersing agent, stirring to obtain uniform mixing liquid, preparing the uniform mixing liquid into composite powder with a closed cycle spray dryer, heating for 1-5h at 700-1100 DEG C, and finally obtaining the asphalt liquid phase coated modified artificial graphite material. After the asphalt liquid phase coated modified artificial graphite prepared by the method is applied to a lithium battery, the artificial graphite shows excellent electrochemical properties such as high first charge-discharge efficiency, high specific capacity and good cycle performance.
Owner:DONGGUAN KAIJIN NEW ENERGY TECH
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