24 results about "Electric double-layer capacitor" patented technology

To provide a high-density carbon material, or a carbon material with controlled density, while being a graphene mesosponge. Also, to provide an electric double-layer capacitor with high energy density per unit volume. [Solution] A method for manufacturing a carbon material, comprising: a composite formation step of forming a carbon layer on the surface of a mold material by chemical vapor deposition using a carbon-containing raw material gas to obtain a carbon layer coated mold material; a mold material removal step of removing the mold material and isolating the carbon material by contacting the carbon layer coated mold material with an acid that dissolves the mold material; an impregnation step of impregnating the carbon material with a shrinking liquid; and a drying shrinkage step of drying and shrinking the carbon material impregnated with the shrinking liquid; and an electric double layer capacitor suitable for manufacture using this manufacturing method.

This invention discloses a polyester membrane comprising: multiple channels spaced apart within the polyester membrane, each channel including a closed chamber; a mixed flame-retardant liquid filled within the chamber, the mixed flame-retardant liquid comprising a free radical scavenging material and a thermal transition material, the thermal transition material comprising a thermosetting polymer and / or a thermo-induced phase change substance; when preset conditions are met, the polyester membrane ruptures, and the mixed flame-retardant liquid flows out from the chamber. The free radical scavenging material is used to block the combustion reaction, and the thermal transition material is used to form a physical barrier layer. The preset thermal runaway emergency condition corresponds to the condition when the battery cell has a risk of thermal runaway. The mixed flame-retardant liquid can be rapidly released based on the preset conditions, achieving combustion reaction blocking through free radical scavenging, combined with the physical barrier effect, effectively curbing the spread of thermal runaway and significantly improving the safety protection level of the battery cell. This invention also discloses a lithium-ion battery.

The application provides an electrode sheet, an electric core, a battery, a battery pack and an electric equipment, and relates to the technical field of batteries.The electrode sheet comprises a current collector, the thickness of the current collector is D2; an active material layer, the active material layer covers at least one surface of the current collector, a plurality of grooves are arranged on the side of the active material layer away from the current collector, the minimum distance between two adjacent grooves is Q, and the thickness of the active material layer is D1; wherein 0.67 mu m <= D1 <= 75 mu m, so that the wettability of electrolyte to the active material layer can be improved by the grooves, and the capacity of the electric core can be ensured.

The invention provides the double-electric-layer capacitor electrolyte with high energy density and cost advantages, the additive of the electrolyte contains small cations to increase the degree of freedom of salt ions and reduce the viscosity, and the anion part contains hydrophobic groups and oxyphilic groups of oxyphilic functional groups on the surface of activated carbon to reduce the contact between water molecules and an electrode interface, so that the service life of the double-electric-layer capacitor is prolonged, and the service life of the double-electric-layer capacitor is prolonged. And furthermore, the gas production rate of the electrolyte is reduced, the high-rate performance is adapted, the capacity exertion is increased, and the characteristic of low cost is compatible. The capacity retention rate of an EDLC battery cell containing the preferable additive is increased to 78.2% (19.3%) from 58.9% of a blank sample after 1000 circles of 125A large-current circulation (the current of a conventional application scene of the capacity battery cell is 25A), the capacitance retention rate is increased to 78.2% (19.3%) from 58.9% of the blank sample after 1500h of high-temperature floating charge at the voltage of 65DEG C and 2.9 V, and the internal resistance growth rate is increased to 78.2% (19.3%) from 58.9% of the blank sample. According to the present invention, the preferable additive can significantly improve the capacity, such that the injection amount of the cell electrolyte can be reduced so as to reduce the production cost on the premise of maintaining the capacity unchanged, the safety is high, the process change is small, the electrochemical performance is significantly improved, and the commercialization requirement can be well met.

To provide an energy storage device that provides a compact design suitable for increasingly smaller components and survives reflow processing.SOLUTION: An ultracapacitor, which is an energy storage device suitable for mounting on a printed circuit board using a solder reflow process, comprises a sealed housing body comprising a positive internal contact and a negative internal contact, each disposed within the body and each in electrical communication with positive and negative external contacts, each of the external contacts providing electrical communication external to the body, an electric double layer capacitor (EDLC) energy storage cell disposed in a cavity within the body and comprising a stack of alternating electrode layers and electrically isolated separator layers, an electrolyte disposed in the cavity and wetting the electrode layers, and a positive lead electrically connecting a first group of one or more of the electrode layers to the positive internal contact.SELECTED DRAWING: Figure 7

A power supply device of the present invention includes a storage circuit including electrical double layer capacitor between first node connected to a power supply, which is an in-vehicle battery, and second node grounded; a charge circuit connected to the first node and configured to charge the storage circuit; and a power supply controller configured to measure voltage at the first node and control the charge circuit. The power supply controller performs procedure of causing the charge circuit to charge the storage circuit and computing first capacitance value and first equivalent series resistance value of the electrical double layer capacitor based on voltage measured at the first node, upon determining the voltage at the first node is lower than a threshold voltage value, that is, determining a stop period of a vehicle is longer than a threshold period.

To provide an electric double layer capacitor which can keep a leakage current low even in a high-temperature region, has a high reliability in a high-temperature region, and can increase the life of a device, and a method for manufacturing the electric double layer capacitor.SOLUTION: There are disclosed an electric double layer capacitor which uses an aqueous electrolyte solution including a water-soluble electrolyte in which the Hammett acidity function H0 at the temperature of 25°C is at least -2.8 and the vapor pressure at the temperature of 100°C is 400 mmHg or smaller, and a method for manufacturing the capacitor.SELECTED DRAWING: None

A lithium ion capacitor includes binder free positive and negative electrode active layers. The capacitor exhibits high energy density, power density and cycle life and provides a good compromise in performance between an electric double layer capacitor and a lithium ion battery.

This invention discloses an electrolyte suitable for electric double-layer capacitors, its preparation method, and its application, belonging to the field of electrochemical energy storage technology. The electrolyte comprises an organic solvent, an electrolyte salt, and additives, wherein the additives are fluorinated acrylate additives. The electrolyte of this invention, applied to 2.5~2.8V electric double-layer capacitors, can suppress hydrolysis gas generation and electrode micropore blockage induced by trace amounts of moisture under high-temperature float charging through the synergistic effects of ion solvation sheath reconstruction, interface property regulation, and steric hindrance polymerization. This results in a reduction of more than half in cell volume expansion, a reduction of more than 27.9% in internal resistance increase, an improvement of capacity retention of more than 6.4%, and a reduction of more than 59.7% in electrolyte free acid content after 8 weeks of float charging at 65℃ and 2.9V. Furthermore, only trace amounts are needed to significantly extend the high-temperature service life of the cell without sacrificing the initial conductivity and capacity of the electrolyte, greatly improving the high-temperature degradation problem of existing AN-based electric double-layer capacitors.

The invention relates to the field of electrochemical energy storage devices, and discloses an electrolyte of a flame-retardant high-power electric double-layer capacitor suitable for an energy storage scene and an electric double-layer capacitor containing the electrolyte, and the electrolyte comprises a liquid-phase flame retardant, a gas-phase flame retardant, a diluent and an optional additive besides a solvent and an electrolyte salt which form the electrolyte; wherein the liquid-phase flame retardant is a macromolecular fluorinated siloxane compound with a silicon-oxygen six-membered ring or eight-membered ring as a skeleton; the gas phase flame retardant is a halogenated phosphazene alkane compound; the diluent is a fluorinated ether diluent; and the additive is a silazane additive. According to the electrolyte, through collaborative design of a gas-liquid two-phase flame-retardant system, the potential safety hazards that an existing acetonitrile-based electrolyte is low in flash point and prone to jetting combustion due to thermal runaway are greatly solved, high safety, long service life and high energy density are guaranteed, and meanwhile the economical efficiency of large-scale mass production and process feasibility are achieved; the method is especially suitable for large-scale energy storage scenes with strict safety requirements.

The present disclosure provides an electric double layer capacitor with an electrolyte layer which suppresses leakage current and has high ion conductivity. The electric double layer capacitor includes a pair of electrode bodies and an electrolyte layer. The electrode bodies have polarizable electrodes. The electrolyte layer includes ionic liquid plastic crystals.

The present application discloses a power supply system and an electronic device. A first power supply unit includes a plurality of voltage converters, each voltage converter being communicated with a corresponding load unit. A second power supply unit includes a plurality of voltage division components, each voltage converter being connected to a corresponding next-level load unit by means of one voltage division component. A monitoring unit is used for acquiring state information of each load unit and transmitting the state information to a control unit. The control unit is separately connected to an electrical double-layer capacitor, the first power supply unit, and the second power supply unit, so as to control, when state information of a target load unit is abnormal, the voltage division component connected to the target load unit to be conducted, and supplement power for the target load unit by means of the electrical double-layer capacitor.

This invention relates to a double-sided gradient microstructure array double-layer capacitive flexible sensor, its fabrication method, and its applications, belonging to the field of flexible sensor technology. On one hand, the invention employs an ion-gel film as the dielectric layer, utilizing its ability to form a thin double layer at the electrode interface to impart high intrinsic sensitivity to the device. On the other hand, it modulates the double-sided gradient micro-pyramid array coated with ion-gel. Through gradient design of microstructure size and array distribution density, large-size micro-pyramids preferentially respond at low pressure, ensuring high sensitivity. As pressure increases, double-sided gradient micro-pyramids of different sizes gradually participate in contact, causing the effective contact area to continuously increase with pressure, thereby significantly widening the sensor's detection range. This invention effectively solves the problem of the mutual constraint between sensitivity and detection range in flexible capacitive sensors, providing an effective approach for developing flexible sensors with both high sensitivity and wide detection range.

To provide a charging method using soil.SOLUTION: The charging method includes mixing an electrically conductive material containing carbon black into soil containing ions to form a conductive portion, providing a positive electrode, a negative electrode, and a separator on the conductive portion, adjusting internal resistance of the conductive portion by the amount of carbon black added and the compaction of the conductive portion, applying a voltage between the positive electrode and the negative electrode to guide anions to the positive electrode and cations to the negative electrode.SELECTED DRAWING: Figure 6

The application belongs to the technical field of batteries, and specifically discloses a battery cell pole group and a battery cell. The battery cell pole group comprises a pole group main body, a first boss and a second boss. Two first bosses are arranged on each end of the pole group main body along a first direction, and the two first bosses are arranged on the pole group main body in a spaced and symmetrical manner along a second direction. The first boss is used for cooperating with a containing space on a battery cell cover plate. A second boss is arranged on each end face of the pole group main body arranged oppositely along a third direction, and two second bosses are arranged symmetrically on both sides of the pole group main body along the third direction. The arrangement of the first boss and the second boss can increase the volume of the battery cell pole group, thereby improving the capacity of the battery cell. Moreover, the whole battery cell pole group adopts a completely symmetrical design scheme, which can reduce the process window during the assembly of the battery cell pole group, the battery cell cover plate and the battery cell shell, and improve the process yield. The application also provides a battery cell comprising the above battery cell pole group.

A lithium ion capacitor includes binder free positive and negative electrode active layers. The capacitor exhibits high energy density, power density and cycle life and provides a good compromise in performance between an electric double layer capacitor and a lithium ion battery.

The invention discloses a preparation method of a self-sacrifice pore-forming binder modified capacitor carbon electrode, a process flow is specifically designed, sodium carboxymethyl cellulose is used as a pore-forming binder, pore-forming and bonding are integrated, the sodium carboxymethyl cellulose exists as a binder at the initial stage, and the sodium carboxymethyl cellulose serves as a pore-forming agent at the post-treatment stage of the electrode, so that the self-sacrifice pore-forming binder modified capacitor carbon electrode is prepared. Volatile small molecules generated by heating can properly expand and communicate pores of the carbon material, electrolyte can fully enter the pore structure due to existence of a proper mesoporous size, the effective specific surface area is increased, the effective adsorption area is increased, the ion transmission path and resistance are reduced, and the rate capability and the capacitance performance of the capacitor are improved.

The application provides a super capacitor and a preparation method thereof. The super capacitor provided by the application is integrally and complexly processed by a fiber reinforced resin matrix composite material and a hole double-layer capacitor, specifically, the double-layer capacitor with a hole structure is laid between fiber cloths or prepregs, the holes on the hole double-layer capacitor are filled with resin in a molding process, a "rivet" structure is formed and connected with an external fiber reinforced structure layer, on the basis of ensuring good electricity storage performance, the in-plane shear resistance, out-of-plane tensile property and impact resistance of the structural super capacitor are effectively improved, and the super capacitor also has excellent waterproof performance.

To firmly form 3-D graphene on a Cu substrate surface of a positive electrode and a negative electrode in an electric double layer capacitor.SOLUTION: Hydrogen radicals are introduced into a plasma atmosphere to remove CuO layers formed on surfaces of Cu substrates of a positive electrode and a negative electrode in an electric double layer capacitor, the surfaces of the Cu substrates are sputtered, and hydrogen radicals and CH4 gas are further introduced to form 3-D graphene oriented in a vertical direction on the surfaces of the Cu substrates. As a result, the 3-D graphene grows perpendicularly to the surface of the copper substrate, so that the tip thereof coincides with the flow direction of lithium ions, and an electric double layer capacitor capable of storing a large amount of ions and electrons can be provided.SELECTED DRAWING: Figure 1

To provide a soil charging method.SOLUTION: A charging method includes providing a separator in a conductive portion in which an electrically conductive material is mixed into soil containing ions, inserting a positive electrode into the electrically conductive material and compacting the electrically conductive material to connect the positive electrode, inserting a negative electrode into the electrically conductive material and compacting the electrically conductive material to connect the negative electrode, applying voltage between the positive electrode and the negative electrode, and introducing anions to the positive electrode and cations to the negative electrode.SELECTED DRAWING: Figure 6

An electric double-layer capacitor capable of maintaining a low leakage current over a long period of time even in a high temperature range, having high reliability in the high temperature range, and thereby making it possible to extend the life of an apparatus using the electric double-layer capacitor is provided. Further, a method for manufacturing such an electric double-layer capacitor is also provided. An electric double-layer capacitor and its manufacturing method are characterized in that an aqueous electrolytic solution containing a water-soluble electrolyte of which a Hammett acidity function H0 at a temperature of 25° C. is −2.8 or higher and a vapor pressure at a temperature of 100° C. is 400 mmHg or lower is used.

The present invention addresses one problem of enhancing the energy density of an electric double layer capacitor by improving the conductivity in the thickness direction of an electrode sheet and then increasing the thickness of the electrode sheet. Moreover, the purpose of the present invention is also to provide an electric double layer capacitor which is safe, has a wide potential range, and has an improved amount of energy that can be stored.　The present invention for solving the problem pertains to an electrode sheet for an aqueous electric double layer capacitor, the electrode sheet being characterized by comprising a conductive auxiliary agent and porous carbon, wherein carbon nanotubes are contained as the conductive auxiliary agent, and the length of the carbon nanotubes is 5-90% of the thickness of the electrode sheet.

The present invention relates to a double layer capacitor balancer for balancing current flowing through a first double layer capacitor and a second double layer capacitor connected in series with each other in sequence between a power line and a common line, which can maximize charging energy efficiency by controlling the same current flowing through both double layer capacitors while allowing deviation within a range in which charging voltages of both double layer capacitors are not problematic. It includes a first resistor, a second resistor, and a third resistor connected in series with each other in sequence between the power line and the common line; a first transistor having a base terminal electrically connected between the first resistor and the second resistor and connected in parallel with the first double layer capacitor; and a second transistor connected in series with the first transistor and having a base terminal electrically connected between the second resistor and the third resistor and connected in parallel with the second double layer capacitor.