122results about "Electrochemical generators" patented technology

A flexible, asymmetric electrochemical cell comprising: (A) A sheet of graphene paper as first electrode comprising nano graphene platelets having a platelet thickness less than 1 nm, wherein the first electrode has electrolyte-accessible pores; (B) A thin-film or paper-like first separator and electrolyte; and (C) A thin-film or paper-like second electrode which is different in composition than the first electrode; wherein the separator is sandwiched between the first and second electrode to form a flexible laminate configuration. The asymmetric supercapacitor cells with different NGP-based electrodes exhibit an exceptionally high capacitance, specific energy, and stable and long cycle life.

There is provided a photovoltaic and fuel cell hybrid generation system using dual converters and a single inverter and a method of controlling the same. A photovoltaic and fuel cell (PV-FC) hybrid generation system according to an aspect of the invention may include: a PV DC/DC converter unit converting a PV output voltage into a predetermined voltage; an FC DC/DC converter unit converting an FC output voltage into a predetermined voltage; a DC link unit commonly connecting an output terminal of the PV DC/DC converter unit and an output terminal of the FC DC/DC converter unit, and linking the converted PV output voltage from the PV DC/DC converter unit to the converted FC output voltage from the FC DC/DC converter unit to thereby generate a DC voltage; and a DC/AC inverter unit converting the DC voltage from the DC link unit into a predetermined AC voltage.

A fuel cell power plant (9) provides DC power to an inverter (12) which provides power to three-phase power lines (16) which are connectable to a power grid (18) by switches (17), and which are connected to a critical customer load (30). An energy storage device (40) provides DC power to a bidirectional DC/AC converter (36) which is connectable through switches (34) to said three-phase power lines or to said power grid. A diode (45) may passively provide fuel cell power plant energy directly to the energy storage device so as to charge it, or bypass the primary DC/AC inverter in the event that it fails. Lapses in power caused by the inverter shutting down due to perturbations on the grid are avoided by power supplied by the converter using energy from the energy storage device.

A power supply unit composed so that outputs from a plurality of cells having different output characteristics are output from common terminals and so that a decrease in energy efficiency caused by connecting the cells is suppressed to the utmost is provided. After outputs of a plurality of cells 10a to 10c having different output voltages and output currents are adjusted to have the same output voltage value, the outputs are output to terminals 4 and 5 so as to match the parallel connection. Since the outputs of the cells are output in parallel, a cell outputting a low current does not restrict the output currents in the overall power supply unit, unlike the series connection. Moreover, since the outputs, which are adjusted to have the same voltage, are connected, problems such as flowback do not occur. In the case where the present invention is applied to a tandem solar cell, a light-absorbing wavelength characteristic can be assigned to each tandem photoelectric transducer so that solar light is utilized at the maximum efficiency, and the photoelectric energy conversion efficiency does not decrease even when the wavelength distribution of solar light deviates from the standard one.

A mixed energy storage photovoltaic system for a lithium-ion cell- a super-capacitor is provided, a photovoltaic cell (1) is an energy source of an energy resource system, the lithium-ion cell (3) and the super-capacitor (4) are combined to be used as an accumulation system, and an energy management circuit (2) intelligently controls the energy resource system and the accumulation system to supply power for a load (5). During initial charging, the super-capacitor (4) terminal voltage is relatively low, and the photovoltaic cell (1) firstly charges the super-capacitor (4); when the super-capacitor (4) is fully charged, the lithium-ion cell (3) is charged; when being no sunshine, the photovoltaic cell (1) has no power output, when the load (5) needs the electricity, the super-capacitor (4) supplies power for the load (5); when the electric quantity of the super-capacitor (4) is insufficient, the lithium-ion cell (3) supplies power for the load through the energy management circuit (2), and supplements electric quantity for the super-capacitor (4). The invention has long service life, high capacity, as well as high output power.

A hybrid battery module and a battery management method are provided. The hybrid battery module comprises a first energy storage unit, a second energy storage unit, and a charging unit. The charging unit is coupled between the first energy storage unit and the second energy storage unit for selectively providing a charging path between the first energy storage unit and the second storage unit. The first energy storage unit and the second energy storage unit transmit the energy stored therein to each other through the charging unit to maintain optimum power statuses thereof.

A nonaqueous system electrochemical mixed capacitor using lithium cell material as positive electrode is prepared as combining ion embedding ¿C deembedding mechanism of lithium cell with double electric layer mechanism in a power accumulator, using LiMn2 ¿C x MxO4 material as positive electrode and using active carbon with high specific surface area as negative electrode to form asymmetric electrochemical capacitor.

The invention discloses mixed cathode diachylon of a superbattery and a preparation method thereof. The diachylon is prepared by mixing the following raw materials in parts by weight: 100 parts of lead powder, 4-10 parts of sulfuric acid, 0.1-8 parts of organic binder, 0.1-2 parts of barium sulfate, 0.01-2 parts of hydrogen separating inhibitor, 1-7 parts of active carbon, 0.1-3 parts of heterodromous graphite, 0.05-1 part of acetylene black, 1-4 parts of humic acid, 5-15 parts of red lead, 12-21 parts of water and 0.1-0.2 part of short fiber. By adding the hydrogen separating inhibitor, the active carbon maintains high-performance capacitance characteristics, so that an electrode has high capacitance. In a part of charge state, the recycling service life of the superbattery is improved by more than 10 times compared with a common lead-acid storage battery.

According to one embodiment, a power supply apparatus comprises a DC/DC converter coupled to an output of a fuel cell, a first diode connected between the output of the DC/DC converter and an output terminal of the apparatus, a second diode connected between an output of a secondary battery and the output terminal, a first transistor connected in parallel with the first diode, a second transistor connected in parallel with the second diode, and a control module configured to set the first and the second transistor to the off and the on state, respectively, when the output voltage of the DC/DC converter is equal to or lower than a reference voltage, and to set the first and the second transistor to the on and the off state, respectively, when the output voltage of the DC/DC converter is higher than the reference voltage.

The invention discloses a preparation method for Li4Ti5O12/C compound electrode material, using a solidifying phase reacting method of low temperature presintering firstly and further high temperature roasting. The method comprises following steps: (1) preparing compound containing Ti and inorganic lithium salts in a certain ratio, mixing and performing ball grinding in an organic solvent medium; (2) in the air atmosphere, increasing temperature to 300-700 DEG C and after keeping the temperature for 2-8h, cooling the mixture to the constant temperature with the furnace to obtain the intermediate product; (3) mixing and performing ball grinding on the intermediate product and carbon source; under the protection of inert gas atmosphere, increasing temperature to 780-950 DEG C and keeping the temperature for 2-20h, then cooling the mixture with the furnace to obtain the Li4Ti5O12/C compound electrode material. The invention has low preparation cost and a characteristic easy to achieve scale production; the synthesized sample has a regular appearance and a stable structure, having high charging-discharging multiplying power and a great circulation performance, which can be used as the electrode material of super capacitor, lithium ion battery or super capacitor battery.

The invention discloses a method for manufacturing a lead-carbon ultracapacitor battery cathode, comprising the following steps: active substances taking lead powder as a main component and active substances taking active carbon as a main component are respectively coated on different areas of an electrode matrix, and then are dried to obtain the lead-carbon ultracapacitor battery cathode. The invention provides a manufacturing technology of lead-carbon ultracapacitor battery cathode, which takes a pure lead sheet or lead alloy sheet as a matrix, and adopts the active carbon and the lead powder as active substances. Compared with the cathode taking the pure active carbon as cathode active substance, the cathode piece manufactured by the method can greatly improve discharge capacity of thelead-carbon ultracapacitor batteries, the specific energy can reach more than 16wh/kg, the cycle life can reach more than 1500 times, working potential window can reach 2.0V, and the cost is only onethird to one fifth of that of the current inorganic system carbon-carbon symmetric form and nickel electrode-carbon mixed alkaline system.

The invention discloses a super capacitor-battery used anode material and a preparation method thereof. Mechanical fusion granulation is carried out on compound material power which has the property of de-lithium-intercalation to obtain ball grains of 1 to 15 micro; porous carbon material with the weight percentage of 10 percent to 100 percent of the weight of the de-lithium-intercalation compound material is added and then the mechanical fusion granulation is carried out, thereby obtaining de-lithium-intercalation compound material coated with porous carbon material. The method of the invention has simple process, and the material obtained has both the large capacity property of a battery material and the high power of a capacitor material. The storage capacity of the anode material can reach 100mAh/g, and the discharge capacity of 10C can reach 90 percent of the discharge capacity of 0.5C. The anode material is the potential electrode material of the novel energy storage system which is applied to an electric driving automobile.

A membrane reactor used for electrochemically converting a carbon dioxide gas into an expected product includes a cavity, a solid electrolyte membrane separator, a cathode, an anode, and a power source. The solid electrolyte membrane separator is disposed in the cavity and divides the cavity into two chambers defined as a cathode chamber and an anode chamber. The cathode is disposed in the cathode chamber, and the anode is disposed in the anode chamber. The cathode is a trickle bed structure including a porous conductive layer and cathode particles disposed on the porous conductive layer. The power source is disposed outside the cavity to provide an electrolytic voltage.

The invention relates to a preparation method of an asymmetric rare earth capacitor battery, and belongs to the field of water power battery. The method comprises the steps that: positive electrode and negative electrode battery slurries and a capacitor slurry are prepared; the positive electrode slurry is coated on foamed nickel, such that a positive electrode is prepared; bake-drying, rolling, powder removing, welding, and longitudinal and transverse cutting are carried out, such that a positive electrode sheet is prepared; the positive electrode sheet is packaged by using a separation film bag; the negative electrode slurry is coated on foamed nickel, and the materials are bake-dried; the capacitor slurry is coated on the material, and secondary bake-drying, rolling, powder removing, welding, and longitudinal and transverse cutting are carried out, such that a negative electrode sheet is prepared; the positive and negative electrode sheets are stacked, such that a battery core is prepared; the battery core is placed in a housing, and welding, top cover sealing, and liquid injection are carried out; and series connection formation is carried out, such that the battery is prepared. According to the invention, laminated coating is adopted in preparing the negative electrode sheet, such that the capacitor material is completely effectively combined with the battery material, and the integration of the positive and negative electrode sheets and the conductive lugs is realized. The battery has the advantages of high safety, environment friendliness, and low cost. The battery has both the energy density advantage of a nickel-metal hydride battery and the power density advantage of an asymmetric supercapacitor, such that operation conditions for electric vehicle and the like can be achieved.

Battery energy storage arranged to be connected to a direct current capacitor, which is connected in parallel to a power converter. The battery energy storage includes a battery module and a controllable voltage source adapted to inject a voltage opposite to a voltage ripple of the direct current capacitor. A power system including such battery energy storage and a direct current capacitor is also disclosed.

An inductor that includes end core pieces and a plurality of center block core pieces between the end core pieces that define a plurality of gaps. The end core pieces are made of an amorphous alloy to provide good magnetic field properties and the center core pieces are stamped magnetic sheets forming a laminate structure to provide ease of manufacturability. In one non-limiting embodiment, the end core pieces are an amorphous iron alloy and the center core pieces are stamped silicon-iron.

The invention provides a lithium ion energy storage device, which comprises a shell and a core arranged in the shell. The core comprises several core monomers and first diaphragms. The core monomers are stacked, and the first diaphragms are pasted between two adjacent core monomers. A core monomer comprises a positive plate, two negative plates and two diaphragms. The positive plate is arranged between the two negative plates. The two second diaphragms are pasted between the adjacent positive plate and negative plates. The positive plate comprises a positive capacitor active material layer, a positive current collector substrate and a lithium ion battery positive material layer that are overlapped and combined in order. The negative plate includes a negative capacitor active material layer, a negative current collector substrate and a lithium ion battery negative material layer that are overlapped and combined in order. The energy storage device provided in the invention has the characteristics of high power density, long service life, as well as simple and stable structure. The preparation method of the lithium ion energy storage device has the advantages of simple procedure, easily controllable conditions, and high production efficiency.

The invention is applicable in the technical field of chemical battery, and provides an annular assembled battery. The annular assembled battery is composed of an annular battery and a cylindrical battery/capacitor, wherein the cylindrical battery/capacitor is sleeved in the annular battery. The invention also provides an annular assembled battery set composed of a plurality of the annular assembled batteries connected by conductor wires. The annular assembled battery and the annular assembled battery set provided by the invention are advantaged in low production cost, high specific energy, long service life, good consistency, excellent heat dissipation performance, and convenient maintenance.

The invention discloses an energy storage and conversion device, which comprises a shell, a diaphragm, a secondary battery anode, a secondary battery cathode, a fuel battery anode, a fuel battery cathode, alkaline electrolyte, an oxygen storage tank and a hydrogen storage tank. The shell consists of a holding space, the diaphragm is arranged in the holding space, the secondary battery anode and the secondary battery cathode are disposed in the holding space, the fuel battery anode and the fuel battery cathode are arranged in the holding space, the fuel battery anode is electrically connected with the secondary battery anode, the fuel battery cathode is electrically connected with the secondary battery cathode, the alkaline electrolyte is formed between the secondary battery anode and the secondary battery cathode, the oxygen storage tank is communicated with the holding space and supplies oxygen to an anode of a fuel battery, and the hydrogen storage tank is communicated with the holding space and supplies hydrogen to a cathode of the fuel battery. The energy storage and conversion device has functions of both the fuel battery and a secondary battery, is simple in structure and low in cost and solves the problem of overcharge.

The invention provides a preparation method of a lead-graphene composite material for a lead-carbon battery. The lead-graphene composite material is prepared by adopting simple methods of liquid-phase reaction, centrifugation, high-temperature sintering and the like. The process is simple, the production efficiency is high, implementation of large-scale production is facilitated and popularization and application are facilitated. The obtained lead-graphene composite material has high hydrogen evolution overpotential, the problem of low hydrogen evolution overpotential of graphene is well solved and the capacitance performance of the graphene is improved. According to the composite material serving as an additive for a negative electrode of the lead-carbon battery, the rate capability and the charge acceptance of the battery can be effectively improved, the cycle life of an HRPSOC can be effectively prolonged, the water loss of the lead-carbon battery is reduced and the application prospect is wide.

Combination fuel cell stack and electrochemical battery system provides stable and redundant electrical power to one or more traction motors. The electrochemical battery packs comprise modules that are switched between a low-voltage parallel configuration connecting to the fuel cell stack and a high-voltage series configuration connecting to the traction motors, thereby harvesting low-voltage energy from the fuel cells and deploying that energy as high-voltage power to the motor. The plurality of electrochemical battery packs can be switched such that at least one is always connected to the traction motor for continuity of power.

A hybrid electric vehicle having alternate fuel sources is shown. The hybrid vehicle includes an AC/DC converter for storing a direct current voltage in a storage device such as a battery. A fuel converter converts a composition combustible fuel into a combustible fuel preferably hydrogen. The combustible material is stored in a combustible fuel storage device. The charging of a battery and the storage of the combustible fuel occur at prior to the starting of or the operation of the hybrid electric vehicle. A driving system includes a direct current motor and a combustible fuel engine. A control device enables the driving system to be powered by the direct current voltage or the combustible fuel. Preferably the combustible fuel is hydrogen. A hydrogen fuel cell is responsive to hydrogen to produce a direct current voltage for charging a battery or driving the direct current motor.