417results about How to "Fast charge and discharge" patented technology

The invention provides a silicon-carbon composite anode material, which comprises a nuclear shell structure and a support substrate, wherein particle size of the silicon-carbon composite anode material is 1-200 micrometers, and porous carbon serving as the support substrate is obtained through decomposition of biomass materials. The invention further provides a preparing method of the silicon-carbon composite anode material, which includes the following steps: 1 reaming the biomass materials in physical activation or chemical activation mode to prepare the porous carbon, or preparing small molecular organics serving as a precursor of the porous carbon in hydrolyzing mode; 2 mixing silica particles and the obtained porous carbon or the precursor of the porous carbon in solution and performing ultrasonic treatment; 3 evaporating the solution mixture to dry so as to obtain solid-state powder; and 4 drying the solid-state powder, and performing thermal treatment, crushing and sieving on the solid-state powder to obtain the silicon-carbon composite anode material. The silicon-carbon composite anode material and the preparing method thereof are simple in process, short in flow path, easy to operate and low in cost, and lithium ion batteries manufactured by the silicon-carbon composite anode material are suitable for various mobile electronic equipment or devices driven by mobile energy.

Embodiments described herein provide methods and systems for manufacturing faster charging, higher capacity energy storage devices that are smaller, lighter, and can be more cost effectively manufactured at a higher production rate. In one embodiment, a graded cathode structure is provided. The graded cathode structure comprises a conductive substrate, a first porous layer comprising a first cathodically active material having a first porosity formed on the conductive substrate, and a second porous layer comprising a second cathodically active material having a second porosity formed on the first porous layer. In certain embodiments, the first porosity is greater than the second porosity. In certain embodiments, the first porosity is less than the second porosity.

The invention discloses a method for preparing silicon carbon cathode materials for lithium ion battery. The method includes synthesizing silicon oxide micro-spheres (SiOx micro-spheres), and then sequentially mixing, coating and carbonizing the SiOx micro-spheres and the pitch solution. The method for preparing silicon oxide (SiOx) / carbon (C) composite materials and the prepared silicon carbon cathode materials for lithium ion battery also disclose the silicon carbon cathode materials for lithium ion battery, the materials for lithium ion battery are prepared by mixing the SiOx micro-spheres / C micro-spheres with artificial graphite. According to the method for preparing silicon oxide (SiOx) / carbon (C) composite materials, the rate of decay of the silicon carbon cathode materials is effectively prolonged, the circulation performance of the silicon carbon cathode materials is improved and the first circulation efficiency of the silicon carbon cathode materials is increased.

The invention discloses a core-shell composite anode material for a lithium ion battery. The composite anode material has a core-shell structure; the core-shell structure consists of a core-layer active material and a shell-layer active material; the core-layer active material is LiFePO4 or lithium manganate; the shell-layer active material is carbon-containing LiFePO4; the LiFePO4 has an Li1-XMXFePO4 or LiFe1-yMyPO4 structure; the lithium manganate has a LiMnO2 or LiMn2O4 structure; the carbon is selected from one or more of carbon nano tubes, superfine conductive black and an agraphitic carbon material; and the composite anode material comprises 65 to 99 mass percent of core-layer active material and 1 to 35 mass percent of shell-layer active material. The composite anode material of the invention has stable performance and excellent electrochemical properties; and the lithium ion battery manufactured by using the material has relatively high charge-discharge capacity and excellent cycle performance, can perform quick charging and large multiplying-factor discharging, can adapt to an ultra-low temperature working environment and is safe and stable.

The invention relates to a monitoring system for an electric automobile battery charging and replacing station. The system comprises a superior system, an electricity distribution monitoring system, a charging monitoring system, a battery replacement monitoring system and a video monitoring system; a monitoring work station, a server, a printer, an electricity distribution system communication management machine and an electricity utilization information collecting terminal are connected with a network exchanger of the charging monitoring system through a local industrial Ethernet; a network exchanger of the electricity distribution monitoring system is connected with a communication gateway of the superior system through the local industrial Ethernet; an intelligent communication terminal of the battery replacement monitoring system is connected with the network exchanger of the charging monitoring system through the local industrial Ethernet; and a video server of the video monitoring system is connected with the communication gateway of the superior system through the local industrial Ethernet. The system can meet the requirement of electric energy complement of large commercial vehicles and small passenger vehicles and can realize omnibearing, effective and real-time monitoring on the battery charging and replacing of electric automobiles.

The present invention relates to a battery energy storage topology structure without the transformer based on MMC modularized multi-level inverter: every phase is connected in series with several subunits which are composed of half-bridge power modules and battery energy storage modules, and get access to the electrical network through buffer inductance. The half-bridge power module is formed by the series connection of an even number of n power units, which is divided into two groups, the upper group and the lower group; the number of each group's power units is n / 2; the number of output phase voltage level step is n / 2 + 1; the number of line voltage level step is n + 1; the output terminal of every phase is the midpoint of two groups of units, and the output terminal is connected with each group of unit by coupling inductance or uncoupling inductance. The power unit is in a half-bridge structure. As the topology is in parallel connection with electrical network, the electric power pollution of electric network can be inhibited; and the topology can make up for the instability of photovoltaic or wind energy generation to provide uninterrupted, clean, stable and high-qualified sine wave voltage of no frequency discontinuity to the load of the electrical network.

The invention relates to the technical field of a lithium ion battery, in particular to a lithium ion battery electrolyte for improving a battery pole piece interface. The lithium ion battery electrolyte comprises a non-aqueous organic solvent, a lithium salt and an additive, wherein the non-aqueous organic solvent comprises at least one of carboxylic ester, halogenated carbonic ester, aromatic hydrocarbon and halogenated aromatics thereof, and the additive comprises at least one of a lithium salt additive, fluoro carbonic ester, fluoro-ether, phosphonitrile and derivatives thereof. Compared with the prior art, the lithium ion battery electrolyte has the advantages that the solvent and the additive are used in a combination way to generate a synergic effect, the electrolyte has a favorable negative electrode interface in a low-temperature and rapid charging / discharging environments, no lithium is precipitated, thus, the requirements of low-temperature charging and discharging, rapid charging and discharging and high compaction density of a negative electrode pole plate can be simultaneously met, and meanwhile, the potential risk caused by lithium precipitation during the charging of the battery is reduced.

The invention relates to a preparation method of a carbon aerogel, particularly a preparation method of a biomass nano cellulose carbon aerogel, and aims to solve the problems of complex preparation process and lack of raw materials in the traditional carbon aerogel. The method comprises the following steps: 1. treatment of biomass material: treating the biomass material with acidified sodium chlorite, and treating with a 1-10 wt% potassium hydroxide solution to obtain purified cellulose; 2. preparing purified cellulose water solutions with different concentrations; 3. mechanical treatment: carrying out ultrasonic treatment on the purified cellulose water solution, carrying out high-pressure homogenization treatment to obtain a nano cellulose water suspension, and standing the nano cellulose water suspension to obtain the nano cellulose aquagel by self-assembly; 4. drying the nano cellulose aquagel to prepare the nano cellulose aerogel; and 5. carrying out carbonizing treatment on the nano cellulose aerogel in a pipe furnace in an inert gas protective atmosphere to prepare the nano cellulose carbon aerogel. The method is applicable to the field of aerogel materials.

The invention discloses a vinylene carbonate-based lithium ion battery polymer electrolyte and a preparation method as well as application thereof in a room-temperature full-solid lithium ion battery. The vinylene carbonate-based lithium ion battery polymer electrolyte comprises vinylene carbonate or a copolymer of vinylene carbonate, lithium salt, a porous backing material and an additive, wherein the molecular weight of a vinylene carbonate-based polymer is 172-1*10<7> Da; the ionic conductivity of the vinylene carbonate-based polymer electrolyte is 1*10<-3>-1*10<-5>S / cm at 25 DEG C; the initial decomposition voltage range is 4.5-5.2 V vs.Li<+> / Li. The vinylene carbonate-based electrolyte is prepared by the in-situ polymerization method, so that the electrolyte has excellent interfacial compatibility with electrodes. The vinylene carbonate-based polymer electrolyte can be used in the room-temperature full-solid lithium ion battery; the vinylene carbonate-based polymer electrolyte is excellent in electrochemical oxidation reduction stability, and can be used in high voltage resistant polymer electrolyte materials. The invention further provides the preparation method of the vinylene carbonate-based lithium ion battery polymer electrolyte, and a lithium ion battery made of the electrolyte.

The invention belonging to the technical field of lithium ion cells, and particularly relates to a method for improving hardness of a lithium ion cell by rapid formation. In the method, by adjusting the pre-baking time and temperature and the formation temperature of an electric core as well as the surface pressure on an electric core main body, the purpose of reducing the electric core polarization is achieved, high-current rapid formation is further realized, and finally the formation stopping potential is adjusted, so as to prepare the lithium ion cell with higher hardness. As compared with the prior art, the method has the following advantages: the high-temperature cramping and baking reshaping after formation is cancelled, so that the prepared electric core is higher in capacity; the electric core bears constant (or variable) pressure during the charge and discharge processes, thus the polarization in the charge and discharge processes is lower, and the capacity consistency of the prepared electric core is better; and because different temperatures and an SOC (state of charge) stopping manner are adopted for formation, the prepared electric core not only has excellent performance, but also has higher hardness.

The present invention provides an energy storage device comprising a cathode region or other element. The device has a major active region comprising a plurality of first active regions spatially disposed within the cathode region. The major active region expands or contracts from a first volume to a second volume during a period of a charge and discharge. The device has a catholyte material spatially confined within a spatial region of the cathode region and spatially disposed within spatial regions not occupied by the first active regions. The device has a protective material formed overlying exposed regions of the cathode material to substantially maintain the sulfur species within the catholyte material. Also included is a novel dopant configuration of the LiaMPbSc (LMPS) [M=Si, Ge, and / or Sn] containing material.

A method for preparing the spinel lithium titanate belongs to the field of the battery. The aim of the invention is to provide a method for preparing the spinel lithium titanate. The essential point of the technical scheme of the invention is that the molecular formula of the spinel lithium titanate is LixTi1.25-yMyO3 / wz according to the method for preparing the spinel lithium titanate. The method for preparing comprises the following steps: (1) after mixing a lithium source and a titanium source with the atomic ratio between lithium and titanium for 0.6-1 into an organic solvent for executing ball milling for 8-24 hours, drying; (2) executing heat treatment to the dried object prepared in the step (1) at the temperature of 300-600 DEG C for 10-24 hours, cooling by radiation; and (3) mixing and executing ball milling to the material obtained in the step (2) and the coating material for 8-24 hours, and after sintering under the protection of nitrogen in the temperature of 700-1000 DEG C for 10-24 hours, cooling and sieving for obtaining the spinel lithium titanate of the invention. The method of the invention is used for preparing the lithium cell.

The invention relates to a composite lithium battery diaphragm which is formed by compounding an upper nanometer fiber membrane, a middle micrometer fiber membrane and a lower nanometer fiber membrane, wherein the fiber diameters of the upper nanometer fiber membrane and the lower nanometer fiber membrane are 1-200 nanometers, and the fiber diameter of the middle micrometer fiber membrane is 1-10 micrometers. The preparation method comprises the steps of respectively preparing the upper nanometer fiber membrane, the middle micrometer fiber membrane and the lower nanometer fiber membrane through a solution electrostatic spinning method by using the polymeric materials of the upper nanometer fiber membrane, the middle micrometer fiber membrane and the lower nanometer fiber membrane; then sequentially releasing and winding laminated layers; then placing into a curing furnace, and heating to remove a solvent; and finally carrying out roll forming on a press roll by controlling temperature. The composite lithium battery diaphragm disclosed by the invention has the advantages of high poriness, good safety, good high-temperature resistance, good mechanical strength and fast charge-discharge and can be used for automobile power lithium batteries.

The invention provides a silicon-carbon composite anode material, which comprises a nuclear shell structure and a support substrate, wherein particle size of the silicon-carbon composite anode material is 1-200 micrometers, and porous carbon serving as the support substrate is obtained through decomposition of biomass materials. The invention further provides a preparing method of the silicon-carbon composite anode material, which includes the following steps: 1 reaming the biomass materials in physical activation or chemical activation mode to prepare the porous carbon, or preparing small molecular organics serving as a precursor of the porous carbon in hydrolyzing mode; 2 mixing silica particles and the obtained porous carbon or the precursor of the porous carbon in solution and performing ultrasonic treatment; 3 evaporating the solution mixture to dry so as to obtain solid-state powder; and 4 drying the solid-state powder, and performing thermal treatment, crushing and sieving on the solid-state powder to obtain the silicon-carbon composite anode material. The silicon-carbon composite anode material and the preparing method thereof are simple in process, short in flow path, easy to operate and low in cost, and lithium ion batteries manufactured by the silicon-carbon composite anode material are suitable for various mobile electronic equipment or devices driven by mobile energy.

The invention discloses an automobile charging and discharging control system and method. A controller of the integral automobile controls a battery management system according to a charging or discharging mode, and the battery management system controls a battery pack to interact with a bidirectional direct-current charging and discharging pile according to the specific charging or discharging mode; under the charging mode, the battery management system controls the bidirectional direct-current charging and discharging pile to charge the battery pack and the bidirectional direct-current charging and discharging pile is powered by the power grid through voltage transformation via a transformer; under the discharging mode, the battery management system controls the battery pack to discharge to the bidirectional direct-current charging and discharging pile, and the bidirectional direct-current charging and discharging pile supplies power to the power grid via transformation by the transformer. By the automobile charging and discharging control method, direct charging and discharging between the automobile and the power grid are realized, and bidirectional interaction control of the power quantity of the power grid and the battery of the electric automobile is realized according to demands of users. In addition, charging and discharging process is simple and quick charging and discharging of the automobile and the power grid can be realized.

The invention discloses a hybrid power energy management system of a trolley car and a control method. The system comprises a fuel cell array, a one-way isolation type DC-DC (direct current) converter in cascade connection with the fuel cell array on the basis of a full-bridge no-voltage no-current switch topological structure, a storage battery, a two-way isolation type DC-DC converter in cascade connection with the storage battery on the basis of a full-bridge no-voltage no-current switch topological structure, a supercapacitor, a two-way isolation type DC-DC converter in cascade connection with the supercapacitor on the basis of a full-bridge no-voltage no-current switch topological structure, an energy management unit based on a DSP (digital signal processor) controller, an interface extension unit based on an FPGA (field programmable gate array) controller, a voltage acquisition and conditioning circuit, a current acquisition and conditioning circuit, a weak current supply unit and a brake resistor. The system can supply energy to a load quickly, the response speed of the system to the load is increased, the brake power can be recovered as much as possible, the fuel availability is improved, the purpose of fuel economy is achieved, the service life of the storage battery is prolonged, and the cost is reduced.

The invention discloses a nano silicon / porous carbon composite anode material of lithium ion batteries as well as a preparation method and an application of the composite anode material. The composite anode material is a core-shell structure material consisting of a porous nano silicon particle core and a porous carbon layer shell. The preparation method of the composite anode material comprises the steps as follows: carbonization treatment is performed after an organic polymer layer is coated on the surface of aluminum-silicon alloy powder, aluminum is removed by performing acid etching on a carbonization product, pore forming is performed on a carbon layer, and thus the nano silicon / porous carbon composite anode material is obtained. The preparation method is simple and low in cost, the mass production requirement is met, and the prepared composite anode material can be used for preparing the lithium ion battery and shows high capacity and excellent cycle and rate performance.

Carbon nanotube memory comprises a buffered data path including a forwarding write line and a returning read line for transferring data. Furthermore, bit line is multi-divided for reducing parasitic capacitance, so that multi-stage sense amps are used for reading, wherein a local sense amp receives a memory cell output through the bit line, a segment sense amp receives a local sense amp output, and a global sense amp receives a segment sense amp output. By the sense amps, a voltage difference in the bit line is converted to a time difference for differentiating high data and low data. For example, high data is quickly transferred to an output latch circuit through the sense amps with high gain, but low data is rejected by a locking signal based on high data as reference signal. Additionally, alternative circuits and memory cell structures for implementing the memory are described.

A sodium ion secondary battery having far superior potential stability during discharge when repeatedly charging and discharging, and a negative electrode active material capable of being efficiently doped and dedoped with sodium ions used therefor are provided. The sodium ion secondary battery according to the present invention includes a positive electrode containing a positive electrode active material capable of being doped and dedoped with sodium ions, a negative electrode containing a negative electrode active material containing, as a sole component or as a main component, a glassy carbonaceous material capable of being doped and dedoped with sodium ions, and an electrolyte containing sodium ions. Further, the negative electrode active material for a non-aqueous electrolyte sodium ion secondary battery according to the present invention includes a glassy carbonaceous material as a sole component or as a main component.

The invention relates to a lithium-sulfur flow battery and a positive electrode electrolyte thereof, as well as a preparation method of the positive electrode electrolyte. The lithium-sulfur flow battery comprises a battery module, the positive electrode electrolyte, a negative electrode electrolyte, a positive electrode electrolyte storage tank, a circulating pump and a circulation line, wherein the battery module is formed by connecting a single cell or more than two single cells in series, the single cell comprises a negative electrode current collector, a lithium negative electrode, a diaphragm, a positive electrode, a positive electrode current collector and a sealing element, and the positive electrode electrolyte which is a mixed solution of Li2S8 containing nano sulfur powder and lithium trifluoromethanesulfonate or trifluoromethane sulfonic acid lithium imide is filled in the positive electrode electrolyte storage tank, wherein the solvent is a mixed solvent which comprises tetraethylene glycol dimethyl ether or glycol dimethyl ether and 1,3-dioxolane at a volume ratio is (1:5)-(5:1) is taken as a solvent. Compared with a traditional lithium-sulfur battery, the lithium-sulfur flow battery has the advantages that the cycle life and the charge and discharge power are improved; an independent positive electrode electrolyte storage tank structure is adopted, so that the capacity is not controlled by an electrode area.

Secondary batteries and capacitors have a high electromotive force together with a high cyclic property and are capable of fast charging and discharging, using a polymeric compound having a high stability and high reactivity in an acidic ambient, as an electrode active material. The secondary batteries and capacitors include an indole polymeric compound as an electrode active material. The polymeric compound uses a proton as a charge carrier and has a constituent represented by general formula (1): wherein each R denotes a hydrogen atom, a halogen atom, a hydroxyl group, a carboxyl group, a sulfonic group, a sulfuric acid group, a nitro group, a cyano group, an alkyl group, an aryl group, an alkoxyl group, an amino group, an alkylthio group and an arylthio group, which may be the same or different from each other, and at least one R is a substituent other than a hydrogen atom.

The present invention provides an energy storage device comprising a cathode region or other element. The device has a major active region comprising a plurality of first active regions spatially disposed within the cathode region. The major active region expands or contracts from a first volume to a second volume during a period of a charge and discharge. The device has a catholyte material spatially confined within a spatial region of the cathode region and spatially disposed within spatial regions not occupied by the first active regions. In an example, the catholyte material comprises a lithium, germanium, phosphorous, and sulfur (“LGPS”) containing material configured in a polycrystalline state. The device has an oxygen species configured within the LGPS containing material, the oxygen species having a ratio to the sulfur species of 1:2 and less to form a LGPSO material. The device has a protective material formed overlying exposed regions of the cathode material to substantially maintain the sulfur species within the catholyte material. Also included is a novel dopant configuration of the LiaMPbSc (LMPS) [M=Si,Ge, and / or Sn] containing material.

The invention discloses ruthenium dioxide-based composite nano-material and a preparation method thereof. The preparation method includes that dispersing carbon matrix in water, adding ruthenium source and oxidized metal source, regulating the pH value of the solution, after stirring to adsorb, performing oil bath reaction, centrifuging, washing, and roasting in an inert atmosphere to obtain the composite nano-material. The preparation method is easy to operate, high in yield, low in cost and environmental friendly, and the prepared ruthenium dioxide / metal nano-particle / carbon composite nano-material is featured with small active ingredient size, large specific surface area and uniform dispersion. The ruthenium dioxide is hydrous ruthenium dioxide which belongs to good reversible charging / discharging active substances, and the metal nano-particle is easy to adsorb protons and transmit electrons to improve the electro-chemical performance of the ruthenium dioxide / metal nano-particle / carbon composite nano-material. The ruthenium dioxide / metal nano-particle / carbon composite nano-material can be used as super-capacitor electrode material and has excellent electro-chemical performance.

The invention relates to a lithium-sulfur battery composite positive electrode material and a preparation method thereof. The positive electrode material consists of following components by weight percent: 30-59.4% of a conductive agent with a mesoporous structure, 40-60% of sulfur and 0.1-10% of a modifying agent, wherein sulfur is dispersed into holes of the conductive agent, and the modifying agent is connected with the holes of the conductive agent through a chemical bonding manner. The preparation method comprises the steps of pouring sulfur into the conductive agent by adopting a molten suction method so as to obtain a conductive agent / sulfur composite material; and then modifying the obtained conductive agent / sulfur composite material to obtain the lithium-sulfur composite positive electrode material. According to the composite positive electrode material, not only can the good high-rate stability be realized, but also the loss of active substances and the influences of corrosion to a lithium negative electrode, rapid capacity fading and the like caused by the 'shuttle effect' due to dissolution of lithium sulfide can be effectively reduced, and the cycle performance of the lithium-sulfur battery can be obviously improved.

The invention relates to a flexible and tailorable solid super capacitor and a preparation method thereof. The super capacitor uses carbon nanotube / polyaniline composite films as electrodes and a polyacrylamide / lithium chloride hydrogel system as electrolyte and a flexible substrate. The flexible and tailorable carbon nanotube / polyaniline composite electrodes are prepared by depositing polyanilineon carbon nanotube films through electrochemical deposition. The two carbon nanotube composite electrodes are isolated by polyacrylamide / lithium chloride hydrogel prepared in advance. Then, the electrodes are permeated by hydrogel pre-polymerized solution, and crosslinking polymerization is carried out, thus obtaining a flexible and tailorable solid super capacitor with high performance. Comparedwith the prior art, the volume specific capacity of the super capacitor is up to 99F cm<-3>, it takes more than 10 hours to reduce the open circuit voltage to half the original, and the super capacitor shows excellent self-discharge performance. The super capacitor obtained is very flexible, can be bent to any shape, and has no performance degradation even after 5000 times of bending. Therefore,the super capacitor has a broad application prospect in flexible and wearable electronic devices and other fields.

The invention discloses a photovoltaic array IV characteristic curve scanning and parameter identification system and method. The system comprises a data acquisition module, a photovoltaic array IV characteristic curve scanning module, a storage module and a display module, wherein the data acquisition module is used for sampling the temperature and the illuminance of a photovoltaic array and transmitting the temperature and the illuminance to the photovoltaic array IV characteristic curve scanning module through a low-power wireless sensor network; IV characteristic curve scanning is carriedout on the basis of a dynamic capacitance charging method, and output current and voltage of the array are detected and stored; and the scanned IV characteristic curve is converted into an IV curve under the standard condition (STC), IV curve fitting is carried out by using an ABC-NM simplex hybrid algorithm and parameters of a photovoltaic model are accurately identified. The system disclosed bythe invention can be carried outside to assist inspectors in manual detection on the photovoltaic array, can also be put into a junction box and can be connected with an upper computer to achieve real-time online component-level and component string-level distributed photovoltaic array IV curve scanning.

The invention provides a low-power-consumption and low-drop-out voltage regulator capable of performing transient state response and relates to the field of analogue integrated circuits. The low-power-consumption and low-drop-out voltage regulator comprises an error amplifier connected with an input bias current source, an output power tube with the input end connected with the high-level input end and a feedback ratio resistor set, wherein the connecting point of the output power tube and the high-level input end serve as a final output end. The low-power-consumption and low-drop-out voltage regulator is characterized in that a first amplification module, a transient state response discharging access module and a driver module are arranged between the error amplifier and the output power tube. The output voltage recovery time in the transient state load changing process from big to small is effectively shortened.

The invention discloses a silicon-based cathode composite material for a lithium ion battery and a preparation method thereof. The cathode composite material is a Si / CuOx / C composite material (0<=x<=1) with a porous structure. Silicon with a porous structure is used as a base, and CuOx particles are inserted in the pores, and carbons with different forms are distributed on a surface and pore walls of the silicon-based material. The preparation method of the cathode composite material comprises steps that silicon material realizes pore-forming through an in situ catalytic reaction between silicon and halogenated hydrocarbon, and reaction condition parameters are regulated to control pore size, distribution and amount of porosity of the silicon material; a post-modification technology is employed to carry out modifications on the surface and the pore walls of the porous silicon, so as to obtain the Si / CuOx / C composite material with a porous structure. The porous silicon-based cathode composite material has low production costs, simple process and no pollution, and is suitable for industrialized production; besides the porous silicon-based cathode composite material has high charge and discharge capacity, small initial irreversible capacity and good cycle performance.

The invention relates to a power battery management system of an electric vehicle. The power battery management system comprises a battery management system control board and a plurality of single battery information acquisition boards, wherein the battery management system control board and the single battery information acquisition boards are connected through RS232 buses for information interaction; the battery management system control board comprises an embedded processor, an RS232 communication module, a CAN bus communication module, a battery pack current acquisition module, a USB communication module, a touch screen human-computer interaction module, an Ethernet communication module, a battery balancing control module and an audible alarm module; and each single battery informationacquisition board comprises an embedded processor, a digital isolator, an RS232 communication module, a single battery voltage acquisition module and a single battery temperature acquisition module.The power battery management system of the electric vehicle is easy to mount and connect by virtue of the modular design. The accuracy of voltage and current acquisition is high and the estimation ofremaining battery power is accurate. The power battery management system of the electric vehicle has a battery balancing function to prevent the battery from being over-charged and over-discharged, and prolongs the service life of a power battery.

Embodiments of the present invention, relating to the field of communications, provide a power supply method, a power supply device, and a base station, which, while satisfying use requirements of a backup power source, prolong the life cycle of a lead acid battery, reduce the set capacity of the original lead acid battery, and thereby reduce investment costs. The method includes: receiving currents supplied by a power generation apparatus, distributing the currents supplied by the power generation apparatus to a load and a lithium ion battery to ensure normal running of the load and enable the lithium ion battery to be charged, and after the lithium ion battery is fully charge, distributing the currents supplied by the power generation apparatus to the lead acid battery so that the lead acid battery is charged.