103results about How to "Realize charging and discharging" patented technology

An electronic device with a universal serial bus (USB) interface with an integration function comprises the USB interface, a processing unit, a power module, a main and auxiliary responding module and a power supply control module. The main and auxiliary responding module is connected between the USB interface unit and the processing unit and used for generating corresponding triggering signals according to the type of the electronic device connected with the USB interface. The processing unit is in communication connection with the electronic device through the USB interface. The power supply control module is connected between the power module and a voltage pin of the USB interface. When the processing unit receives a first triggering signal, the processing unit controls the power supply control module to forbid energy, and voltage connected into the voltage pin of the USB interface is used for charging the power module. When the processing unit receives a second triggering signal, the processing unit controls the power supply control module to output voltage to supply power to the electronic device connected with the USB interface. By means of the electronic device, only one USB interface is required to achieve data transmission and charging and discharging of the electronic device as a main device or an auxiliary device.

The invention aims to provide a positive active material for a rechargeable magnesium battery and the rechargeable magnesium battery. Charge and discharge can be realized when the positive active material is used in the rechargeable magnesium battery. In addition, the positive active material can improve characteristics of the rechargeable magnesium battery. The positive active material for the rechargeable magnesium battery is represented by the molecular formula MgMSiO4, wherein M contains at least one element selected from Co, Ni and Fe.

The invention discloses a two-stage balance control circuit, system and policy for charge and discharge of lithium battery packs. The balance control circuit comprises a symmetrical multi-winding transformer and DC-DC converters; the system comprises the lithium battery packs and the two-stage balance control circuit for charge and discharge of the lithium battery packs, connected with the lithium battery packs; the two-stage balance control circuit comprises a data acquisition circuit, a balance circuit, a controller and a driving circuit; according to the control policy, balance control between single lithium batteries in the lithium battery packs is performed firstly; and then balance control between the lithium battery packs is carried out. According to the method, the DC-DC converters are used for performing balance between the single lithium batteries and the improved symmetrical multi-winding transformer is used for performing balance between the lithium battery packs; and therefore, by complementing advantages of the two kinds of topological structures, the problems of complex control, inaccurate balance, slow speed, low efficiency, high cost and the like existing in the lithium battery balance technology are solved.

The invention provides a battery control circuit for a double-electrical-energy locomotive, comprising a dc switch, a charger, batteries and isolated conversion units. When an overhead contact system supplies power for traction, the batteries are discharged through the charger and the isolated conversion units; when the batteries supply power for traction, the locomotive is pulled by electrical energy of the batteries through the isolated conversion unit and the dc switch; and when the locomotive is in a regenerative breaking condition, the batteries are charged by feedback braking energy of a traction motor through the charger and the isolated conversion units. The battery control unit provided in the invention can realize battery charge and discharge of the double-electrical-energy locomotive and can utilize breaking energy generated by breakings of the traction motor. The dc switch is not required to be disconnected when the batteries store braking energy, thereby avoiding frequent actions of the dc switch with the applications of electrical breakings, ensuring reliability of the dc switch, and prolonging service life of the dc switch. In addition, the battery control circuit for the double-electrical-energy locomotive of the invention can realize circuit extension and circuit isolation conveniently.

The invention discloses a railway power regulator based on a half-bridge structure, which comprises two single-phase step-down transformers and a half-bridge inversion module, wherein the half-bridge inversion module comprises a pair of switch arms and a pair of series capacitors, and the switch arms are connected into a back-to-back structure by two capacitors; and the primary sides of the two single-phase step-down transformers are connected with power supply arms at the two secondary sides of a traction transformer, ungrounded lines at the secondary sides of the two single-phase step-down transformers are respectively connected with the switch arms in the half-bridge inversion module by an inductor, and the two single-phase step-down transformers are grounded and are connected with the middle points of the two capacitors in the half-bridge inversion module. Compared with a structure adopting two H-bridge single-phase converters, the cost of the active capacity of the railway power regulator is lowered by one time. Under the precondition that the same function is finished, the cost and the complexity of hardware are decreased, and the reliability of a compensation device is enhanced, so that the invention is greatly beneficial to the high-power modularization of the device and has favorable application prospect.

The invention belongs to the technical field of a preparation method of chemical materials, and particularly relates to a preparation method of a silicon-silver composite anode material of a lithium ion battery and a reaction kettle. The method comprises the steps of: preparing silver-ammonia solution by taking ammonia water as a complexing agent; reacting in the specifically designed reaction kettle by taking glucose as a reducing agent; reducing silver nitrate by rigidly controlling the reaction temperature and a pH value, and uniformly and compactly coating silver on the surfaces of silicon powder particles so as to obtain the silicon-silver composite anode material of the lithium ion battery. The preparation method is simple in productive technology without any complicated device; and reactions are carried out at normal temperature, and industrial production is easy to realize. According to the invention, volume expansion of silicon powder is restrained to a certain extent; the reversible capacity of the battery is improved, and the cycle performance is improved; the conductivity of silicon is improved; and pulverization of silicon is restrained in charge and discharge processes, and the performance of silicon-based anode material is improved. By adopting the preparation method, the silicon-silver composite anode material achieves heavy-current charge and discharge, and the tap density of the material is improved at the same time.

The invention provides a magnesium-lithium double-ion battery composite cathode material, a preparation method and application thereof, and a battery system, and belongs to the field of magnesium ionbatteries. In the magnesium-lithium double-ion battery composite cathode material, a polyaniline layer has a protective effect on the composite cathode material, and PANI-coated VS4 / rGO is higher in conductivity and of a more complete structure, which is favorable for achieving charging and discharging under a large current density; a PANI conductive layer does not participate in electrochemical reaction, and coats the surface of VS4 to improve the conductivity of VS4, and can well adapt to the charging and discharging process under the high current density; meanwhile, the PANI layer reduces the loss of active substances in the core VS4 during charging and discharging, thus maintaining the structural integrity; and the PANI layer allows VS4 to better adapt to the volume change caused by the intercalation and deintercalation of Mg<2+> and Li<+>, and reduces the loss of the active substances on a current collector, thereby significantly increasing the stable cycle capacity of the cathodematerial.

The invention discloses a control system of an automobile power battery, which comprises a power battery and further comprises a bidirectional converter and a supercapacitor, wherein the power batteryis connected with the supercapacitor through the bidirectional converter, and the bidirectional converter is used for controlling joule heat generated during energy exchange between the power batteryand the supercapacitor to heat the power battery. The control system has the advantages that the repeated charging and discharging of the power battery are realized through the bidirectional conversion function of the bidirectional converter and the characteristic of high power density of the supercapacitor at low temperature, the charging and discharging processes are continuously carried out, and the heating efficiency and speed are high through the internal resistance of the battery. Meanwhile, the additionally arranged supercapacitor can store energy which cannot be recycled by the battery in the energy recycling process, so that the energy recycling rate is increased, and thus the endurance mileage of the electric automobile is increased.

The invention relates to a formation detection system and a formation detection method for secondary batteries. The system comprises a direct current (DC) bus, at least one alternating current (AC) / DC device, a plurality of DC-based charging and discharging devices, a plurality of data acquisition devices and a control device, wherein the AC / DC device provides power for the DC bus; one charging and discharging device is connected with a group of secondary batteries and used for controlling the charging and discharging of a single secondary battery according to a charging / discharging control command for the single secondary battery, which is transmitted by the control device, and controlling the simultaneous discharging of all secondary batteries in a secondary battery group according to a discharging control command for the group, which is transmitted by the control device; one data acquisition device is connected with a group of secondary batteries and the control device; and the control device is used for transmitting the charging / discharging control command for the single secondary battery and the discharging control command for the secondary battery group according to detected data transmitted by the data acquisition device.

The invention discloses a bidirectional energy storage converter, and relates to the technical field of power transmission and transformation. The bidirectional energy storage converter comprises a plurality of DC boost-buck units, a three-phase inversion bridge circuit, a controller, an adaptor, an AC filtering circuit, an isolation transformer and an AC EMI filter, wherein the AC EMI filter is connected with an AC bus, the AC bus is connected with a power grid by an AC circuit breaker, a high-voltage end of the isolation transformer is connected with the AC EMI filter, a low-voltage end of the isolation transformer is connected with an AC output end of the three-phase bridge inverter and an AC input end of the adaptor, a DC input end of the three-phase bridge inverter is connected with the DC boost-buck units, and a sampling signal input end of the controller is connected with a DC input end / AC output end of the three-phase bridge inverter and a DC output end / AC input end of the adaptor. By the bidirectional energy storage converter, bidirectional energy flowing of the AC system and the DC system can be achieved, multi-path DC inputs of multiple paths of different types of DC power supplies also can be achieved, peak clipping and valley filling of a power grid load can be achieved, and the bidirectional energy storage converter also has the functions of emergency power supply, reactive power compensation, electric energy quality control and the like.

The invention relates to an energy conversion device and a vehicle, which can be compatible with various direct current charging and discharging modes and are low in cost. The energy conversion device comprises an alternating current motor, a bidirectional PWM inverter and a switch module, the alternating current motor comprises x sets of windings, all phases of windings of each set of windings are controlled through motor vectors to enable the alternating current motor to operate, and the windings are staggered by a certain electrical angle theta; the bidirectional PWM inverter comprises x groups of bridge arms, each group of bridge arms is connected with one set of windings, and the number of the bridge arms of each group of bridge arms is matched with the phase number of the windings connected with the bridge arms; the switch module comprises a first switch sub-module and a second switch sub-module, the first switch sub-module controls the electrical connection between the bus of one group of bridge arms and the direct current charging and discharging port, and the second switch sub-module controls the electrical connection between each group of bridge arms; and at least two sets of windings in the x sets of windings and the corresponding bridge arm groups jointly form a loop for charging and discharging the power battery.

The invention relates to an electromagnetic exploration transmitting system based on super capacitor energy storage. The electromagnetic exploration transmitting system based on the super capacitor energy storage uses one power generation unit, one rectification filter circuit, one super capacitor bank energy conversion circuit, one inverter bridge transmitting circuit, one voltage detection circuit, one current detection circuit, one control circuit and a transmitting electrode assembly. The power generation unit provides a three-phase power supply for the system; the rectification filter circuit achieves alternating current-direct current (AC-DC) conversion of the power supply and provides stable direct current bus voltage for the system so as to facilitate charge-discharge of a capacitor bank in operation; the super capacitor bank energy conversion circuit achieves energy storage and release; the inverter bridge transmitting circuit achieves DC-AC conversion and transmits signals; the current detection circuit and the voltage detection circuit achieve real-time detection of output current and voltage and provide real-time signals for the control circuit; the control circuit is a central processing unit and achieves pulse-width modulation (PWM) control so as to obtain stable and reliable transmitting signals; and an electrode is a system signal transmitting port.

The invention discloses a ceramic-coated diaphragm for lithium-ion battery and a preparation method of the ceramic-coated diaphragm. After being treated through hydrothermal reaction of alkali solution, ceramic powder for a commercial lithium-ion battery diaphragm is mixed with binder and solvent, and then sprayed to the diaphragm by an electrostatic spraying method. Compared with the diaphragm before being coated with ceramic powder, the ceramic-coated diaphragm has the advantages of high thermal resistance, high mechanical strength and high liquid-absorbing rate. The ceramic coating sprayed by the electrostatic spraying method is uniform and compact, and plays an important role in improving the liquid-absorbing rate, the thermal resistance and the strength.

The invention provides a single-phase inverter for eliminating ripple waves at a direct current input end. The single-phase inverter is connected between a direct current input end and an alternated current output end and comprises a direct current detection circuit, an alternated current detection circuit, a direct current-direct current conversion circuit, a direct current-alternated current conversion circuit, an electric conversion control circuit and a ripple wave eliminating unit, wherein the ripple wave eliminating unit is used for eliminating the ripple waves at the direct current input end according to an input direct current electric signal and an output alternated current electric signal; the ripple wave eliminating unit comprises a ripple wave controller, an energy storage unit and an energy storage controller; the ripple wave controller is used for controlling a working mode of the ripple wave eliminating unit according to the input direct current electric signal and the output alternated current electric signal; the energy storage unit is used for storing or releasing the energy at the direct current input end; and the energy storage controller is used for controlling the switching on and off of the energy storage unit. The invention also provides a solar photovoltaic generating system. In the single-phase inverter provided by the invention, under the condition of utilizing the ripple wave eliminating unit to detect a ripple wave power and control the working mode of a conversion circuit, a voltage on a capacitor changes following an energy waveform and can be controlled to be equal to the ripple wave power, thereby realizing charging and discharging and eliminating the ripple waves at the direct current input end.

The invention relates to a lithium ion battery positive material, in particular to a preparation method for a lithium ion fast conductor modified lithium phosphate material. The preparation method is characterized by comprising the following steps: (1) according to the components of the lithium ion fast conductor, covering raw materials including a lithium source, an A source, a B source, an N source, a silicon source and a phosphorus source are mixed with lithium iron phosphate to be covered to form a precursor, and then the precursor is dried; (2) the obtained precursor is sintered in an inert atmosphere, the sintering temperature is 400-1,000 DEG C, and the soaking time is 2-20 hrs. In the preparation method, a layer of lithium ion fast conductor film is compound on the surface of a nano lithium iron phosphate, so as to greatly improve the power performance of the nano lithium iron phosphate; particularly, the glass state lithium ion fast conductor is a well-know favorable and stable lithium conductor, at the same time, favorable conductivity is acquired by adulterating a transition metal; and adopting the material prepared by the invention to manufacture batteries, more than 40 c high current charging / discharging can be achieved.

The invention provides an aqueous rechargeable sodium-ion capacitor battery based on a titanium phosphorus oxide cathode material. The aqueous rechargeable sodium-ion capacitor battery based on a titanium phosphorus oxide cathode material comprises a positive electrode, a negative electrode, a separator and electrolyte. The positive electrode comprises a sodium manganese oxide, conductive agent and adhesive. The negative electrode comprises a titanium phosphorus oxide, conductive agent and adhesive. The electrolyte is inorganic salt water-soluble solution containing sodium ions. The sodium manganese oxide and the titanium phosphorus oxide are obtained by the steps of raw material mixing, grinding, tablet pressing and calcining. The aqueous rechargeable sodium-ion capacitor battery based on a titanium phosphorus oxide cathode material has higher energy efficiency, higher power density, a longer cycle life and higher utilization rate of active materials than lead-acid batteries, and is cheaper, safer and more environment-friendly than cadmium-nickel batteries and hydrogen-nickel batteries. The preparation process is simple, and the battery can be prepared directly in the air. The battery has low requirement for the environment, has a wide range of material sources, is low in cost, and is suitable for industrialized mass production.

The invention discloses a preparing method used for a flow microsphere zinc electrode of a secondary zinc battery. Zinc-plated conducting microspheres are highly distributed in flow electrolyte consisting of zinc salt solution of zinc bromide and zinc chloride, quaternary ammonium salt and hydrobromic acid solution, and the zinc-plated conducting microspheres and a three-dimensional mesh current-collection body commonly constitute the flowable microsphere zinc electrode, wherein the zinc-plated conducting microspheres are prepared by the following steps that: 50-200mum-diameter conducting microspheres are placed in a cathode region of an electrolytic tank to be electroplated and are stirred at the same time so that plating layers of the microspheres are uniform, the microspheres with the moderate thickness of the plating layers can be obtained through time control, zinc-plated solution consists of Zn<2+> with the concentration being 3-25g / L and NaOH with the concentration being 15-180g / L, the cathode-current density is 0.5-4.0A / dm<2>, and the temperature is 10-40 DEG C. According to the preparing method, the deformation and the pine-tree crystal of a solid zinc polar plate in the charging and discharging processes of the zinc electrode and the dropping of active substances caused by the deformation and the pine-tree crystal can be effectively avoided, thereby improving the performance of the zinc electrode of the zinc battery obviously and realizing large-current charging and discharging.

The invention discloses a charging and discharging system with adjustable bidirectional currents and voltages of a supercapacitor and belongs to the technical field of charging and discharging of the supercapacitor. The charging and discharging system is composed of four IGBI modules (Q1, Q2, Q3 and Q4) with backward diodes, a current accumulation inductor (L1), two input and output end middle energy storage capacitors (C1 and C2), two voltage collecting modules (Vm1 and Vm2), two current collecting modules (Cm1 and Cm2), two double-unit IGBI drive modules (D1 and D2) and an STM32103VE microprocessor (M1) produced by the STMicroelectronics enterprise. The charging and discharging system has the prominent advantages that the purpose of charging and discharging in the wide voltage range of the supercapacitor can be achieved with few devices, and the problem that due to the fact that the charging and discharging voltage is mismatched with the impedance, a power source or power devices are damaged is solved.

The invention belongs to the field of power system automation, and provides a high-reliability self-energy-obtaining circuit based on an energy-obtaining current transformer with an iron core. The high-reliability self-energy-obtaining circuit comprises a specially-made energy-obtaining CT, a rectifying circuit unit, a short-circuit current bypass and energy-obtaining balance regulation circuit unit, an energy storage circuit unit, an overvoltage protection and energy-obtaining balance control circuit unit, a self-energy-obtaining circuit self-starting and storage battery control circuit unit,a DC / DC module power supply and the like. The overvoltage protection and energy-obtaining balance control circuit unit is configured to couple a primary system with a strong interference bypass at asecondary side when the system generates short-circuit faults or is stroke by lightening to prevent the energy-obtaining CT iron core from saturation; the energy-obtaining balance regulation circuit unit employs a dynamic energy-obtaining mode of supply change with demand to automatically regulate the self-obtaining power so as to achieve balance between supply and demand; and moreover, the self-energy-obtaining circuit self-starting and storage battery control circuit unit is configured to perform effectively power supply management.

The invention relates to a preparation method of a flexible and foldable all-organic secondary battery, and belongs to the technical field of electrochemical power sources. The preparation method of the flexible and foldable all-organic secondary battery comprises the following steps: (1) preparation of an anode material and a thin film, namely adding naphthalenetetracarboxylic dianhydride and 4,4'-diaminodiphenyl ether to an n-methyl pyrrolidone (NMP) solution, adding a graphene conducting agent and carrying out reflux reaction in an argon atmosphere to prepare the film; (2) preparation of a cathode material and the thin film, namely putting ferrocene, tetramethylethylenediamine and n-butyl lithium into a Schlenk reaction bottle, adding petroleum ether, reacting and precipitating the mixture, cleaning the sediment with a solvent, adding the petroleum ether, dropwise adding hydrogen methyl dichlorosilane, and carrying out thermochemical polymerization on solid to prepare the film; (3) preparation of polymer gel electrolyte, namely mixing polyvinyl pyrrolidone with NaCl / H2O liquid; and (4) battery assembly, assembling the cathode material film, the anode material film and the gel electrolyte into the battery. The preparation method has the advantages that the process is stable; the product is ultrathin, controllable, flexible, foldable, easy to design, safe and nontoxic, and can meet the requirements of human body fitting comfort and special occasions.

The invention discloses a secondary aluminium cell. The secondary aluminium cell comprises a cathode, an anode and electrolyte, wherein elemental sulfur or organosulfur compounds are selected as cathode active materials; metallic aluminium or aluminium alloys is / are selected as anode active materials; and non-aqueous aluminium-containing electrolyte formed by anhydrous aluminium salts, an ionic liquid and an organic solvent is used.

The invention discloses an oscillator of a PWM (pulse-width modulation) controller, which comprises three branch circuits connected in parallel with an input voltage source and an operational amplifier, wherein a first branch circuit is provided with a resistor R1 and a resistor R2; a second branch circuit is provided with a resistor R3, a triode N1 and a resistor R4; a third branch circuit is provided with a resistor R5; the resistor R5 is respectively connected with a capacitor C1 and a resistor R6 which are connected in parallel and the anode of a diode D2; and the reverse input end of the operational amplifier is connected between the resistor R6 and a capacitor C2, the non-reverse input end is connected with the collector electrode of the triode N1 and connected with a resistor R7 which is connected in series with the anode of a diode D3, the output end is connected with cathodes of the diode D2 and the diode D3, and the first signal output end and the second signal output end are connected between the resistor R7 and the diode D3. The provided oscillator of a PWM controller has favorable frequency consistency, low rate of change with temperature and wide external synchronization clock frequency range; and synchronization can be realized above and below the natural vibration frequency of the oscillator.

The invention discloses a preparation method of ion vanadium redox battery electrolyte. The method comprises the following steps: 1. mixing vanadium pentoxide powder and sulfuric acid solution, heating and stirring until the temperature is 50-250DEG C to obtain turbid liquid of the mixed the vanadium pentoxide powder and the sulfuric acid water solution; 2. preparing organic reductant water solution, wherein the organic reductant comprises any one of C1-4 water soluble alcohols and water soluble aldehydes; 3. adding the sulfuric acid water solution into the turbid liquid, sealing the outlet of a reaction container, heating, stirring, and controlling temperature to be between 50 and 250DEG C; after reaction ends, opening the outlet of the container, and continuously heating for 5-180 minutes; and after solution is cooled to room temperature, carrying out constant volume to obtain the vanadium redox battery electrolyte. The method has the advantages of low raw material cost, wide resource, simple and easily-operated technology, moderate and safe reaction condition and short reaction period and is suitable for large-batch production, and the vanadium redox battery electrolyte with low cost and high performance is prepared, and the vanadium redox battery electrolyte shows favorable electrochemistry performance in the charging and discharging experiment.

Disclosed is a high-reliability high-voltage high-current electromechanical servo driver. A peak voltage generated between a collector electrode and an emitting electrode in a turn-off process of an IGBT can be effectively suppressed; meanwhile, a peak value of a fluctuation voltage caused by overhigh bus inductance after the peak voltage also can be suppressed, thereby ensuring the high reliability of the electromechanical servo driver, wherein after an IGBT driving circuit receives a low-level input, the IGBT driving circuit outputs a certain intermediate voltage between plus 14.5V and plus 7V for a certain while instead of directly outputting a minus 8V level to turn off, for example, the IGBT driving circuit outputs plus 9V and then outputs minus 8V to turn off. Due to the fact that current of the collector electrode of the IGBT is in direct proportion to the turn-on voltage of a gate pole, the plus 9V door pole level limits the current of the collector electrode of the IGBT to be a relatively low value; and therefore, when the driving circuit outputs minus 8V to turn off the IGBT consequently, the generated current change rate is not too high, namely, the suppression to the peak voltage is realized, and the safety of the IGBT is protected.

The invention discloses a vehicle charging and discharging control device and method and a vehicle, and the device comprises a battery interface which is used for being connected with a high-voltage battery of the vehicle; the charging and discharging interface is connected with the battery interface through the charging and discharging module and used for being connected with a gun head at one end of the charging connecting device to be connected with external equipment through the charging connecting device; the control module comprises a type recognition unit and a mode control unit, and the type recognition unit is used for identifying the gun head type of the gun head connected with the charging and discharging interface when it is determined that the charging and discharging interface is connected with the external equipment through the charging connection device; the mode control unit is used for controlling the vehicle and external equipment to carry out charging handshake andcontrolling the charging and discharging module to enter a working mode corresponding to the gun head type; and the charging and discharging module is used for charging external equipment by utilizingthe DC provided by the high-voltage battery in a direct-current discharging mode or an alternating-current discharging mode. According to the invention, the charging between the electric vehicles canbe better realized.

The invention relates to the technical field of power supply, and discloses a charge and discharge control device for a ring network cabinet. The device comprises an external power supply, a ring network cabinet protecting shell, a supercapacitor module and a voltage detector, wherein the internal part of the ring network cabinet protecting shell is equipped with a bidirectional DC / DC converter close to the front of the voltage detector, the internal part of the ring network cabinet protecting shell is equipped with a power failure detector close to the front of the supercapacitor module, the front of the external power supply is equipped with a controller, one end of the ring network cabinet protecting shell is provided with a movable sealing plate, and the inner side of the ring network cabinet protecting shell is provided with heat dissipation fins close to the upper parts of the voltage detector and the supercapacitor module. The charge and discharge control device for the ring network cabinet is good in heat dissipation performance, facilitates the assembly and disassembly of electrical appliances, solves the problems that power distribution faults cannot be removed and the power supply of power failures lines cannot be recovered due to the insufficient power supply of the traditional external power supply, and can continuously supply power to a large number of users.

The invention relates to a non-isolation step-down LED drive circuit capable of adaptive power supply and a working method. The non-isolation step-down LED drive circuit comprises a rectification filter circuit and a control module, wherein the power supply end of the control module is connected with the output end of the rectification circuit through a resistor. An adaptive power supply circuit is arranged in the control module. The adaptive power supply circuit comprises a microprocessor unit, a step-down unit, a plurality of Pn junctions connected in series and an analog switch unit. The output end of the step-down unit is connected with the input ends of the Pn junctions in series, and the output end of the step-down unit serves as the voltage output end of the adaptive power supply circuit. Nodes are arranged among the Pn junctions, the nodes are connected with the switch input ends of the analog switch unit respectively, and the switch output ends of the analog switch unit are connected with one another and connected to the ground through a resistor. The power supply end of the processor unit obtains sampling voltage, and the control output ends of the processor unit are respectively connected with the control end of the analog switch unit.

The invention discloses a switched capacitor type DC / DC converter, a switching power supply and a control method. The switched capacitor type DC / DC converter comprises a controllable switch and n switched capacitor modules, the n switched capacitor modules are connected in series to form a voltage transformation branch, and the voltage transformation branch is connected with the controllable switch in series, and n is an integer greater than or equal to 1. When the DC / DC converter realizes different voltage transformation ratios, n can take different values, for example, when n is equal to 1,the voltage transformation ratio realized by the DC / DC converter is 2: 1; when n is equal to 2, the voltage transformation ratio realized by the DC / DC converter is 2: 1; when n is equal to 3, the voltage transformation ratio realized by the DC / DC converter is 5: 1; when n is equal to 4, the voltage transformation ratio realized by the DC / DC converter is 8: 1; and when n is equal to 5, the voltagetransformation ratio realized by the DC / DC converter is 13: 1, and so on. The converter can realize buck or boost, and does not internally comprise a transformer, so that the volume of the whole converter is reduced.

The invention discloses a charging and discharging control system and a control method thereof. The charging and discharging control system comprises a charging and discharging control module, a mainnegative relay, a discharging relay and a charging and discharging port. One end of the charging and discharging control module is connected with the first end of the main negative relay, the other end of the charging and discharging control module is connected with the first end of the discharging relay, the second end of the main negative relay is connected with a negative electrode of the charging and discharging port, and the second end of the discharging relay is connected with a positive electrode of the charging and discharging port. The charging and discharging control module is used for controlling the on-off states of the main negative relay and the discharging relay according to a charging rule so as to perform charging control, and controlling the on-off states of the main negative relay and the discharging relay according to a discharging rule so as to perform discharging control. According to the embodiment of the invention, the charging and discharging of the charging and discharging control system are realized through one main negative relay and one discharging relay, the number of components in the charging and discharging control system is reduced, and the controlcost is reduced.

The invention relates to the field of battery materials, and particularly relates to a lithium metal battery. The lithium metal battery provided by the invention comprises a lithium metal negative electrode and a protective layer located on the lithium metal negative electrode, wherein the protective layer comprises a polymer Y, a polymer Z and a polymer W; the polymer Y is selected from one or more of polyvinylidene fluoride and polyvinylidene fluoride-hexafluoropropylene, the polymer Z is selected from one or more of polytetrafluoroethylene or a compound shown in a formula I, and the polymerW is selected from one or more of a compound shown in a formula II and / or a compound shown in a formula III. According to the lithium metal battery provided by the invention, an interpenetrating network structure can be formed through a chain entanglement effect between two or more polymers, so that a polymer protection layer is formed on the surface of the lithium negative electrode, the formedprotection layer can realize uniform deposition and dissolution of lithium during high-current charging and discharging, and meanwhile, excessive side reaction between the lithium negative electrode and an electrolyte is inhibited.