146results about How to "Easy to charge and discharge" patented technology

Disclosed is a wind and solar hybrid power system based on an ultra-capacitor battery hybrid system, which includes a DC / DC buck converter (20), an AC / DC converter (30), an ultra-capacitor assembly (40), a DC / AC converter (50), a battery assembly (60), a battery charge circuit (700), a photovoltaic array (70), a wind generator (80) and an oil engine / commercial power interface (90). The photovoltaic array (70) is connected with the ultra-capacitor assembly (40) through the DC / DC buck converter (20); the wind generator (80) and the oil engine / commercial power interface (90) are connected with the ultra-capacitor assembly (40) through the AC / DC converter (30); the ultra-capacitor assembly (40) charges the battery assembly (60) through the battery charge circuit (700); the ultra-capacitor assembly and the battery assembly provides a definite power buffering to the system so that to maintain a stable voltage of the power supply. The wind and solar hybrid power system of the invention can provides uninterrupted power to the telecommunication system and resident living in the undeveloped areas where the power distribution network can not reach.

The invention provides a control method of a grid friendly type distributed power source based on hybrid energy storage. The method comprises the steps of optimally designing a topology structure of the distributed power source, controlling a direct current power supply system in a coordinating mode through a direct current (DC) / DC converter controlling a model normalization model, and self-adaptively controlling a grid of an alternating current (AC) side DC / AC converter. The distributed power source not only can be connected in a large grid to operate so as to reduce the influence of intermittent renewable energy power generation grid connection on the grid and provide support of voltage and frequency for the grid, but also can be connected into a micro-grid to operate as a network unit of the off-network type micro-grid to maintain stability of voltage and frequency of the off-network type micro-grid. When an outer grid breaks down, the distributed power source can realize switch between a grid mode and an island mode so as to improve power supply reliability of important loads in the system. The distributed power source improves technical performance and economic performance of the whole system through matching utilization of an energy type system and a power type energy storage system.

The invention discloses a silicon-carbon composite material, a preparation method of the silicon-carbon composite material, and a lithium ion battery containing the silicon-carbon composite material. The preparation method comprises the following steps of: (1) reducing silicon dioxide by using metal with activity larger than that of silicon, so as to obtain a porous silicon-metal oxide composite; (2) corroding the metal oxide by acid, so as to obtain porous silicon; and (3) coating the surface of the porous silicon by carbon by taking a carbon source as a raw material, so as to obtain the silicon-carbon composite material. The silicon in the silicon-carbon composite material is prepared through using a metallothermic reduction method and porous silicon particles prepared through using the metallothermic reduction method are micron-sized and hardly agglomerate; the pore walls and the pore diameters in the porous silicon particles are nano-sized; compared with imporous micron-sized silicon powder, for the silicon-carbon composite material, the porous silicon particles have the characteristics that a diffusion path of a lithium ion in a silicon substrate is shortened, thus being beneficial to charging and discharging with large current, the pores can hold the volume expansion of silicon during silicon intercalation and the charging and discharging cycle life of the material is prolonged. The surfaces of the porous silicon particles are coated with a carbon layer with the certain pores and the conductivity of the silicon-carbon composite material is enhanced.

The invention discloses an energy control method for an independent photovoltaic hybrid energy storage system. The hybrid energy storage system comprises a storage battery, a super capacitor, a photovoltaic power generation unit, a DC bus and a DC load. The storage battery and the super capacitor are connected in parallel with the DC bus through respective bidirectional DC / DC converters. The photovoltaic power generation unit is connected to the DC bus through a BOOST converter. After data acquisition, an energy control processor calculates the power that should be borne by the hybrid energy storage system, and then the power passes through a first-order low-pass filter. According to limit control methods of different sections, the hybrid energy storage system, under different control conditions, achieves power distribution to the storage battery and the super capacitor, maintains the stability of the DC bus, stabilizes photovoltaic output power fluctuation, maintains in-system power balance, optimizes the work of energy storage equipment to a certain extent, and prolongs the service life of the energy storage equipment.

A secondary battery includes: an electric cell layer including a stack structure sequentially including: a positive electrode layer, a separator layer, and a negative electrode layer having an electrolyte higher in conductivity than an electrolyte of at least one of the separator layer and the positive electrode layer.

The invention relates to a titanium niobate composite material, a preparation method thereof, and a cathode and a battery containing the composite material. The titanium niobate composite material is represented as BxCyNz-LaTibMcNbdOe, wherein BxCyNz represents a compound containing boron carbon or carbon nitrogen or boron carbon nitrogen; L represents Li or Na, preferably Li; M is one element selected from Al, B, V, Cr, Mn, Fe, Co, Ni, Ce, Y, Zr, Mo, La, Ta, N and P; x, y, z, a, b, c, d and e represent mole percentages, x is no less than 0 and less than 1, y is larger than 0 and less than 1, z is no less than 0 and less than 1, a is no less than 0 and no larger than 0.2, b is larger than 0.8 and no larger than 1.1, c is no less than 0 and less than 0.2, d is larger than 1.95 and no larger than 2.1, e is no less than 6.8 and no larger than 7, and x and y are not 0 at the same time. The composite material disclosed herein and used as a cathode material of a lithium ion battery has the advantages of high coulombic efficiency, high ionic and electric conductance, good cycling performance of high-rate charge and discharge, high safety, no pollution, and low price.

The invention relates to a wind and solar hybrid generation system for a communication base station based on dual direct-current bus control, comprising photovoltaic arrays, a wind-power generator, storage battery sets, unloading devices, an intelligent controller, a charging side direct-current bus, a discharging side direct-current bus, a storage battery set switching circuit, a photovoltaic array switching circuit, an unloading device switching circuit, an overload protecting circuit, a load distributing circuit, an AC / DC converter and a DC / AC inverter. The intelligent controller is sequentially connected to a charging storage battery set and a discharging storage battery set in turn through monitoring the voltage and current change of the dual direct-current buses, switches the photovoltaic arrays and is connected to the unloading devices step by step to control the connection of secondary loads. The invention can effectively enhance the generating capacity of the photovoltaic arrays and the wind-power generator and the utilization ratio of storage batteries, extend the service lift of the storage batteries, supply stable direct-current output, reduce the cost of the system andprovide continuous stable power supply to the communication base station far away from a grid.

The invention relates to a preparation method of a micro-expansive graphite anode material which has a controllable expansion times being 2-10. The method includes following steps: mixing a battery-class powdery graphite material, an oxidizing agent and an intercalator according to a mass ratio of 1:0.05-1.0:0.5-10, performing an oxidizing and intercalating process for 30-60 min at 10-40 DEG C; performing a filtering process at room temperature to separate a solid subject, washing the solid subject until a pH value of a filtrate is 6-7; performing a drying process; feeding the solid subject to a horizontal tubular furnace; performing expansion in an inner atmosphere at 200-800 DEG C for 1-30 min; and performing thermal insulation to obtain the anode material.

The invention relates to A2B7 type RExYnNiz-a-bMnaAlb hydrogen storage alloy. The alloy is good in pressure-composition-isothermality, and has a maximum hydrogen storage amount of up to more than 1.36 wt.% under usual conditions. The alloy of the invention has better electrochemical performance as a hydrogen storage electrode and better gas-phase hydrogen absorption and desorption performance as a hydrogen storage material than traditional LaNi5 type hydrogen storage alloy; the alloy contains no magnesium element in the composition, so the preparation method of the alloy is simple and safe when compared with that of traditional rare earth-magnesium-nickel-based A2B7 type hydrogen storage alloy.

The invention belongs to the lithium ion battery field, in particular to a preparing method of a composite electrode capable of being used as a negative electrode of a lithium ion battery, which has high specific capacity, high charging and discharging reversibility and excellent circularity. The composite electrode comprises an electrode active material and a current collector, wherein the electrode active material is a composite material which utilizes carbon with fine interface compatibility as a base, and utilizes silicon, tin or other compounds as active species, and utilizes nickel, copper or graphite and polymer pyrolysis carbon as fillers, the current collector includes current collecting materials such as foamed nickel, foamed copper or carbon cloth which have three-dimensional network structure, certain high temperature resistance property, sound conductivity and can enable electrode active substances to be uniformly distributed inside or on the surfaces, and the composite electrode is prepared by dispersing silicon (tin) / nickel (copper, graphite) compounded in compounding process of the electrode active material through the high temperature solid phase reaction.

The invention relates to a rare earth family hydrogen storage alloy with the general formula of RExYyNiz-a-b-cMnaAlbMc. The alloy treats the rare earth Y as one of main components, contains Mn and Al elements or one of Mn and Al, also contains one or more of Cu, Fe, Co, Sn, V and W, contains no alkali earth metals, and is simple and safe to produce. The hydrogen storage alloy has a good compression-composition-isothermal characteristic and a large hydrogen storage amount reaching above 1.28wt% under usual conditions; the highest capacity of the above hydrogen storage alloy electrode is higher than that of LaNi5 type hydrogen storage alloy; and the rare earth family hydrogen storage alloy has good activation performances, rate discharge ability, and charge and discharge or hydrogen absorption and desorption cycle stability, can be used in a wide temperature range, and has small self discharge.

The invention relates to a method for the preparation of high rate lithium ion capacitor battery cathode material by pyrolyzing asphalt at low temperature to cover graphite, belonging to the technical field of the preparation of energy storage material. The invention comprises the steps that: first, mixed solution containing graphitizing catalyst, water and alcohol is formulated, then graphite, asphalt powder and conductive agent are added therein for being mixed for several hours, the resultant mixture is dried in an atmosphere of the air, the asphalt is then pyrolyzed in an atmosphere of Ar or N2, and in the end, salpeter solution is used to remove the graphitizing catalyst by means of dissolution, and the high rate lithium ion capacitor battery cathode material with pyrolyzed asphalt covering the graphite is obtained by sufficient washing and drying. The cathode material obtained according to the method has the characteristics of high capacity and good high rate performance, is simple in process flow and includes tremendous application value.

The invention discloses a control method based on a hybrid energy storage voltage source inverter (VSI) stabilizing microgrid power fluctuation. A hybrid energy storage system two-stage energy management method is designed. The method exploits the advantages, to the full, that according to a super capacitor, the power density is high, and charge and discharge cycle life is long; the super capacitor serves as system first stage energy storage stabilizing the microgrid power fluctuation preferentially; a distribution grid serves as second stage energy storage during grid connected operation; the super capacitor terminal voltage is stabilized in the range of a charging and discharging limited value by controlling the tie line power, and the PCC point bus voltage changes in an allowed range; a battery serves as second stage energy storage during island operation, the charging and discharging number of the battery is decreased through the buffering effect of the super capacitor, and the service life of the battery is prolonged; when the super capacitor reaches a charging and discharging warning value, the battery is accurately controlled to output constant power so as to adjust the super capacitor terminal voltage into a normal value. The effectiveness of the method is verified through simulation results.

The invention discloses a high-capacity graphite composite material of a lithium-ion battery and a preparation method of the composite material. The high-capacity graphite composite material comprises two materials a and b, wherein a is highly graphitized particles, while b is secondary composite particles with core-shell structures; the secondary composite particles with the core-shell structures are prepared from natural graphite by virtue of impurity removal, spheroidization, coating and gluing; the weight ratio of a to b is 90:10 to 5:95. The high-capacity graphite composite material is produced by virtue of a high-temperature integrated coating, gluing and carbonizing process, and cooling; as a result, the graphite capacity is improved, the cost is reduced, and the problems of poor high-current charging / discharging performance and poor compaction performance of the graphite are solved.

The invention discloses a silicon-carbon composite negative pole material, a preparation method thereof and a lithium ion battery using foamed metal as a negative pole current collector, belonging to the field of the lithium ion battery. The lithium ion battery using foamed metal as a negative pole current collector comprises foamed metal used as the negative pole current collector and the silicon-carbon composite negative pole material; the three-dimensional pore conduction network structure and the high porosity of the foamed metal are beneficial to the contact between silicon active substances and the current collector, and the foamed metal has high adhesion strength, so that the great volume effect of the silicon active substances can be well relieved, and the silicon active substances are not prone to fall in the charging / discharging process, thereby effectively promoting the cycling stability of the silicon-carbon composite negative pole material; the silicon-carbon composite negative pole material of which the general formula is Si-C-X has a disperse carrier and a high-capacity lithium-storing material containing the silicon active substances; and the disperse carrier is a carbon material having stable lithium-storing capacity and reversible lithium intercalation / deintercalation performance, thereby obviously improving the capacity and the rate discharging performance of the lithium ion battery.

The invention relates to the field of hybrid energy storage photovoltaic systems, in particular to a bidirectional Buck transformer-based super capacitor and storage battery hybrid energy storage photovoltaic system, which comprises a photovoltaic array, a direct current / direct current (DC / DC) transformer, a super capacitor, a storage battery, a bidirectional Buck transformer and a load, wherein the photovoltaic array, the DC / DC transformer and the load are sequentially connected; the super capacitor and the bidirectional Buck transformer are connected between the DC / DC transformer and the load respectively; and the storage battery is connected with the bidirectional Buck transformer. According to the system, the photovoltaic array is high in utilization rate, the charging speed and the efficiency are high, the cycle life is long, the storage energy of the super capacitor can be maximally utilized, and the technical problems of short cycle life of a conventional photovoltaic energy storage system and low energy utilization rate of the super capacitor are solved.

The invention discloses a lithium ion capacitor which comprises a membrane, a lithium ion supplying source and a shell and further comprises a cathode piece, an anode piece and organic electrolyte containing lithium. Micro-expansion graphite materials are adopted for the cathode piece to serve as cathode active materials. The micro-expansion graphite materials, a conductive agent and a binding agent are evenly mixed in a solvent according to the mass ratio of 80-90:4-8:6-12, prepared into slurry to be coated on the positive face and the reverse face of a copper foil current collector and dried. The coating thickness of the single face ranges from 30 micron to 100 micron, roll-in is conducted on electrode pieces through a roller press, and the cathode piece of the lithium ion capacitor can be obtained by cutting the electrode pieces obtained after the roll-in is conducted through a dividing and cutting machine.

The invention discloses a ternary lithium battery electrolyte and a high-temperature resistant, high-capacity and high-safety lithium battery core. According to the lithium battery core, a high-temperature resistant high-safety electrolyte is prepared by adopting a novel lithium salt of a conductive lithium salt LiBOB (lithium bis(oxalate)borate) and a lithium salt LiFSI (lithium bis(fluorosulfonyl)imide) and adding a proper amount of additive of FEC (fluoroethylene carbonate), MMDS (methylene methanedisulfonate) and TMP (trimethyl phosphate). A novel ternary positive electrode material coatedwith a mixture of nano titanium dioxide and a ternary material (LiNi0.8Co0.1Mn0.1O2) is adopted by a positive electrode, and a mixture of mesocarbon microbeads MCMB and carbon nanotubes is adopted bya negative electrode, thereby preparing the novel high-temperature resistant high-capacity lithium-ion power battery core for an automobile. According to the prepared battery core, the cycle performance is improved, and meanwhile, the problem of high-temperature air expansion is well solved.

The invention relates to a graphene-supported silicon quantum dot negative electrode material and a preparation method and application thereof. The preparation method comprises the following steps of (1) synthesizing silicon quantum dots which are highly uniform in size by a solvothermal method based on an organic silicon precursor; (2) highly uniformly loading the silicon quantum dots on graphene oxide by a non-covalent self-assembly method to prepare graphene oxide supported silicon quantum dots; and (3) reducing the graphene oxide by a thermal treatment method to prepare the graphene-supported silicon quantum dot negative electrode material. The preparation method has the advantages of low cost, simplicity in process, controllability and low energy consumption, and can be scalable, and moreover, the obtained graphene-supported silicon quantum dot negative material is high in charging / discharging and rate performance and very stable in circulation.

The invention relates to a method for preparing a micro-expanded graphite anode material of which the expansion times are controllable within 2-10 times. The method comprises the following steps: mixing a battery-grade powder graphite material with an oxidizing agent and an intercalator according to a mass ratio of 1 to (0.05-1.0) to (0.5-10), carrying out oxidization and intercalation for 30-60 minutes at 10-40 DEG C, subsequently filtering at the room temperature to separate solid, washing the solid till the pH value of filtrate is 6-7, drying, subsequently feeding into a horizontal tube type furnace for puffing for 1-30 minutes at 200-800 DEG C in the presence of inert atmosphere, and keeping the temperature, thereby obtaining the micro-expanded graphite material.

The invention relates to a tubular fixed lead-acid storage-battery anode active substance for energy storage, comprising lead powder, read led, nano-graphite, bitter salt, charcoal and silicon dioxide. The read led is capable of improving the transforming efficiency of the anode active substance and reducing the duration of formation; the sound conducting performance of the nano-graphite can improve the conducting capability of the active substance and facilitate charge and discharge of the storage battery; the bitter salt, charcoal and silicon dioxide can effectively improve the porosity of the active substance, thus building the network structure of the active substance to facilitate the electrolyte to melt into the active substance efficiently, thereby, the high-current discharge capability and the utilization ratio of the active substance are improved; besides, the invention is also environment friendly.

The invention relates to a rare earth family hydrogen storage alloy with the general formula of RExYyNiz-a-b-cMnaAlbMcZrATiB. The highest capacity of the rare earth family hydrogen storage alloy which is an electrode is higher than that of LaNi5 type hydrogen storage alloy. A preparation method of the rare earth family hydrogen storage alloy is simple and safe. The rare earth family hydrogen storage alloy has good activation performance, rate discharge ability, and charge and discharge or hydrogen absorption and desorption cycle stability, can be used in a wide temperature range, has small self discharge, and can be used to produce negative electrodes of alkaline secondary batteries, and secondary batteries containing the hydrogen storage alloy disclosed in the invention.

The invention discloses a preparation method of a high-performance graphite negative electrode material for a lithium ion battery. The method comprises the following steps of 1) collecting petroleum coke micropowder in a shaper and a grinder in normal graphite production, and mixing the petroleum coke micropowder, ground expanded graphite powder, raw mesocarbon microbeads and an adhesive in a mixer for 0.5-3 hours according to a mass ratio of 1 to (0.01-0.3) to (0.7-1.5) to (0.1-0.2) to form a solid-phase coated mixture, wherein the frequency of the mixer is 30-50HZ; and 2) graphitizing the solid-phase coated mixture obtained in the step 1) to obtain the high-performance graphite negative electrode material for the lithium ion battery. The method is simple and feasible; micropowder wastes in a dust collector are recycled, so that the cost is reduced; the method is easy for large-scale industrial production; and the obtained graphite negative electrode material has the characteristics of high energy density, good liquid absorption and retention performance, good cycle performance, good isotropic performance, good high-rate charge / discharge performance and low expansion rate in a charge / discharge process.

The invention relates to a control method for a schedulable wind-solar-diesel storage independent microgrid based on droop control. The independent microgrid comprises a direct current power supply system and an alternating current power supply system. According to the control method, the coordinated control of the direct current power supply system mainly depends on energy management of a local coordinated controller together with the control of an underlying device DC / DC converter; the alternating current power supply system uses the droop control to participate in regulating the voltage andfrequency of an island microgrid system. The method can effectively stabilize the accuracy of the magnitude of common direct current bus voltage, achieve non communication control between power sources, and achieve frequency and voltage control; a basis is provided for independent micro power grid control. The control method can be widely used in the control of independent microgrid control.

The invention provides a phase variation lithium ion electrolyte comprising the following components of lithium salts and organic compounds containing acid amide functional groups. The invention also provides a preparation method of the electrolyte, comprising the following steps: a. mixing the lithium salts and the organic compounds containing acid amide functional groups; b. heating the mixture and melting the mixture to obtain transparency liquid; and c. cooling the transparency liquid to obtain the electrolyte, wherein the steps a, b and c are operated in dry environments. The phase variation lithium ion electrolyte is applied to chargeable and dischargeable lithium batteries. In addition, the invention also provides a chargeable and dischargeable lithium battery comprising the electrolyte. The electrolyte has lower electrical conductivity and higher thermal and chemical stability when being a solid under the condition that the temperature is lower than a phase variation temperature and has higher electrical conductivity when being liquid under the condition that the temperature is higher than the phase variation temperature.

The invention discloses a self-assembly polyimide porous material, a preparation method thereof and application thereof in a lithium sulfur battery. The self-assembly polyimide porous material is obtained by taking aromatic dianhydride and diamine as raw materials, forming multi-layer poreous polyimide particles in a single organic solvent by self-assembly of molecules and performing high-temperature carbonization and sulfur washing, the polyimide porous material is formed by assembling polyimide sheet layers, the thickness of each sheet layer is 20-40 nanometers, and gaps of 50-200 nanometers exist among the sheet layers. The self-assembly polyimide porous material is used for preparing a lithium sulfur battery positive electrode material. The self-assembly polyimide porous material has the beneficial effect of moderate reaction condition and is simple to operate; the morphology of the self-assembly polyimide porous material can be controlled only by controlling reaction time and concentration of a reactant; the synthesized carbon material contains a nitrogen element and has a certain suppression effect on shuttling of a polysulfide of the lithium sulfur battery; and the self-assembly polyimide porous material is relatively large in size, the contact resistance can be reduced, and charging and discharging under large rate are facilitated.

The invention relates to a rare earth family hydrogen storage alloy with the general formula of RExYyNiz-a-b-cMnaAlbMcZrATiB. The highest capacity of the rare earth family hydrogen storage alloy which is an electrode is higher than that of LaNi5 type hydrogen storage alloy. A preparation method of the rare earth family hydrogen storage alloy is simple and safe. The rare earth family hydrogen storage alloy has good activation performance, rate discharge ability, and charge and discharge or hydrogen absorption and desorption cycle stability, can be used in a wide temperature range, has small self discharge, and can be used to produce negative electrodes of alkaline secondary batteries, and secondary batteries containing the hydrogen storage alloy disclosed in the invention.

A yttrium-nickel rare earth hydrogen storage alloy and a secondary battery containing the hydrogen storage alloy of the present invention relate to an AB3 type RExYyNiz-a-bMnaAlb hydrogen storage electrode alloy. The alloy has good activation performance, rate discharge capability, cycle stability of charging and discharging or hydrogen absorption and desorption, can be used in a wide temperature range, has small self-discharge, and its maximum electrochemical capacity can reach more than 360mAh·g-1 . The electrochemical performance of the alloy as a hydrogen storage electrode and the gas-phase hydrogen absorption and desorption performance as a hydrogen storage material are superior to those of the traditional LaNi5 type hydrogen storage alloy. In comparison, the fabrication method is simple and safe.

A hybrid energy storage-containing photovoltaic DC micro-grid coordinated control method comprises the following steps of: establishing a control strategy of a photovoltaic power generation system, and enabling the photovoltaic power generation system to operate in an MPPT mode and a CVC mode; dividing the operation mode of a DC micro-grid into a plurality of working modes; establishing a low-pass filter model to distribute power borne by a hybrid energy storage system; calculating the working currents of a super-capacitor and a storage battery according to the power and terminal voltage borne by the super-capacitor and the storage battery respectively; designing the control mode of a bidirectional DC / DC converter by comparing the charging and discharging current reference value of an energy storage device with the actual working current; and when the photovoltaic power generation system and the energy storage device in the DC micro-grid are not enough to stabilize power fluctuation in the system, or the energy storage device fails and cannot participate in adjustment, integrating the DC micro-grid into a large power grid through the bidirectional DC / DC converter. According to the method, complex parameter setting and mass calculation can be avoided, the service life of the energy storage device is considered while control is flexible, and the operation economical efficiency is improved.