52results about How to "Increase internal resistance" patented technology

The invention relates to a negative pole piece, a battery and electric equipment. The negative electrode piece comprises a negative electrode current collector layer and a negative electrode material layer, the negative electrode current collector layer and the negative electrode material layer are arranged in a stacked mode, the negative electrode material layer comprises liquid absorption particles, each liquid absorption particle comprises a liquid absorption core layer and a shell, the shell wraps the periphery of the liquid absorption core layer, the shell is a polymer shell layer, and the liquid absorption core layer and the shell are arranged in a staggered mode. And the melting temperature T of the shell is more than or equal to 100 DEG C and less than or equal to 150 DEG C.

The invention discloses an electrolyte, a secondary battery and a power utilization device, and belongs to the technical field of batteries, the electrolyte comprises a lithium salt, the molecular structure of the lithium salt contains C3-C20 alkyl ether, a sulfonic acid amine group and a fluorine element, the lithium salt has a large dipole moment and a high donor number, meanwhile, the lithium salt can be combined with Li < + >, and the lithium salt can be combined with Li < + >. A solvation structure is formed, solvent decomposition is inhibited, and the fast charging performance and the cycle performance of the secondary battery are remarkably improved.

The invention provides a metamaterial broadband microwave absorber which comprises a metal bottom plate and a dielectric layer located above the metal bottom plate, and a plurality of semiconductor periodic structure units are periodically laid and arranged on the upper surface of the dielectric layer; each semiconductor periodic structure unit comprises a segmented ring-shaped structure and a cross-shaped structure which are connected with each other; the segmented circular ring structure comprises at least three segmented circular rings which are concentrically arranged and have different radiuses; each segmentation circular ring is divided into four arc pairs which are symmetrically distributed by a cross-shaped structure; the metal bottom plate is made of a conductive metal material; the dielectric layer is made of an insulating electrolyte material; and the product of the thickness and the conductivity of the semiconductor periodic structure unit is a fixed value. By adopting the metamaterial absorber, the problems of narrow band and polarization sensitivity in the existing metamaterial absorber can be relieved.

The invention relates to the technical field of thermal batteries, in particular to a high-specific-energy long-endurance thermal battery composite positive electrode material and a preparation method and application thereof.The composite positive electrode material is formed by compounding a high-capacity cobalt-based multi-component composite positive electrode material A and a high-conductivity cobalt-based multi-component composite positive electrode material B. Compared with traditional FeS2 and CoS2 positive electrode materials, the composite positive electrode material has the advantages that the specific energy of the composite positive electrode material is greatly improved; the material has the advantages of high pyrolysis temperature, good conductivity and high specific energy, and is suitable for high-specific-energy long-endurance thermal batteries.

The present invention provides a negative electrode active layer, a double negative electrode active layer, a negative electrode plate and a lithium ion battery. The negative electrode active layer includes a carbon-modified lithium metasilicate binder, and the content of the carbon-modified lithium metasilicate binder is 2.4% to 3.2% based on the total weight of the negative electrode active layer as 100%. The negative electrode active layer of a lithium ion battery provided by the present invention, which includes carbon-modified lithium metasilicate, can be used as a binder to construct a cross-linked network in the negative electrode active layer, improve the internal resistance, adhesion, liquid absorption capacity, expansion and ion conductivity of the negative electrode plate, and finally obtain a lithium ion battery that can simultaneously take into account high rate performance, low internal resistance and long cycle.

The present application relates to an electrolyte and an electrochemical device comprising the electrolyte. The electrolyte comprises a dinitrile compound, a trinitrile compound, and propyl propionate, wherein, based on the total weight of the electrolyte, X is a weight percentage of the dinitrile compound and Y is a weight percentage of the trinitrile compound, and Z is a weight percentage of the propyl propionate; 2 wt% < (X+Y) ≤ 8 wt%, 0.1 ≤ (X / Y) ≤ 6, 2 wt% < X ≤ 6 wt%, 30 wt% ≤ Z ≤ 50 wt%, and 0.01 ≤ (Y / Z) ≤ 0.3.

The invention belongs to the technical field of battery foils, and particularly relates to a method for reducing interface resistance of an aluminum foil-carbon coating layer. The method comprises the following steps: (1) treating, washing and drying an aluminum foil by using a sodium hydroxide solution; (2) coating one surface of the aluminum foil with conductive slurry, performing first drying in an oxygen-deficient atmosphere or an inert atmosphere, and coating the surface of the aluminum foil with a first carbon coating layer; and (3) coating the conductive slurry on the other surface of the aluminum foil, carrying out second drying, and coating the second carbon coating layer on the other surface of the aluminum foil. Therefore, by controlling the oxygen-deficient atmosphere or the inert atmosphere in the drying and first drying processes, the problem that aluminum oxide is regenerated from aluminum in the drying and first drying processes is avoided. Therefore, the problems that the resistance of the carbon-coated aluminum foil is increased and the interface resistance of the pole piece is increased are solved.

The utility model relates to the technical field of lithium batteries, and provides a pole piece and a battery. When the pole piece is a positive pole piece, the internal resistance of the active material coatings of the second edge area and the third edge area is larger than the internal resistance of the active material coating of the main body area, so that the lithium removal speed of the edge areas of the positive pole piece is slowed down, and the phenomenon that the lithium precipitation potential of a negative pole is too low due to the fact that the concentration of overhang edge electrolyte salt is too high in the rapid charging process is reduced; and the problem of lithium separation on the edge of the corresponding negative electrode edge area is not easy to occur. When the pole piece is a negative pole piece, the impedance of the active material coating of the marginal area b and the marginal area c is smaller than that of the active material coating of the main body area, so that the diffusion speed of lithium ions in the marginal areas of the negative pole piece is increased, and lithium ions separated from the positive pole side can be quickly embedded into the edge of the negative pole; and the problem of lithium separation on the edge of the corresponding negative electrode edge area is not easy to occur.

This invention discloses a fluorine-containing cathode material, its preparation method, and its application. The fluorine-containing cathode material includes a bulk material and a fluorine-containing lithium cobalt compound coated on the bulk material. The chemical formula of the fluorine-containing cathode material is Li. 1+x (Ni (1‑c‑d) Co d Mn c ) 1‑b‑e M b M′ e F y O 2‑y In this invention, the fluoride in the fluorinated coating layer reacts with lithium in the bulk material of the fluorinated cathode material to form a fluorinated cobalt lithium compound. Since the conductivity of the fluorinated compound is very low, coating with the fluorinated cobalt lithium compound significantly increases the impedance of the fluorinated cathode material in the battery, increasing the battery's internal resistance and sacrificing battery capacity. By simultaneously coating with the fluorinated coating layer and replenishing lithium, the conductivity of the fluorinated cathode material is significantly improved, thereby achieving the goal of increasing the capacity of the fluorinated cathode material and improving cycle performance.

The utility model relates to an anti-extrusion power cable. The technical problem to be solved by the utility model is to provide an anti-extrusion power cable. According to the technical scheme, the power cable comprises an inner compression-resistant assembly and three power core assemblies arranged around the inner compression-resistant assembly at equal intervals, the power core assemblies are sequentially wrapped by inner sheaths, filling layers and outer buffering assemblies, the inner compression-resistant assembly comprises steel wires and buffering rubber wrapping the steel wires, and the outer buffering assemblies are arranged on the outer sides of the steel wires. The outer buffer assembly comprises a compression-resistant rubber spring, a spring wrapping layer and a copper sheath which are sequentially arranged from inside to outside, and the copper sheath is of a threaded structure. Compared with the prior art, the cable has the advantages that due to the design of the inner and outer pressure-resistant structures, the outer copper sheath and the pressure-resistant rubber spring are matched to form a first layer of buffering, the copper sheath releases pressure through the threaded structure when the cable is pressed, and the pressure-resistant rubber spring has high internal resistance, can resist certain pressure and can rebound.

The present application provides a binder and a preparation method thereof. The binder comprises a copolymer comprising a building block (I) and a building block (II), wherein the building block (I) is formed by copolymerizing a building block (i) and a building block (ii). The binder of the present application is a multifunctional binder with excellent binding, dispersing and thickening properties. An electrode sheet prepared from the binder of the present application has a relatively low electrode sheet resistance. A secondary battery prepared from the binder of the present application also has excellent cycling performance.

The invention discloses an ultrathin porous nickel hydroxide nanosheet supercapacitor electrode material and a preparation method and application thereof, and belongs to the technical field of capacitor electrode materials. According to the material, an amorphous alloy serves as a core layer to play a self-supporting role, nano-porous nickel layers on the two sides provide a nickel source for in-situ growth of nickel hydroxide, and mutually-crossed ultrathin porous nickel hydroxide on the outermost layer serves as an active substance and vertically grows on the surface of the nano-porous nickel in situ; the diameter of the ultrathin porous nickel hydroxide is 0.5-2 mu m, the thickness of the ultrathin porous nickel hydroxide is 2-10 nm, and the size of holes in the nanosheet is 5-8 nm. The preparation method of the material has the advantages that the operation is simple, the cost is low, high temperature and use of nickel salt are not needed, the repeatability is good, and Ni (OH) 2 grows on nano porous nickel in situ and is a self-current-collector electrode material.

The embodiment of the invention discloses a wireless charging earphone box, a metal rotating shaft on wireless charging electronic equipment and a method for reducing heating of the metal rotating shaft. The wireless charging earphone box is provided with an earphone box main body, an earphone box upper cover and a metal rotating shaft, an induction coil for wirelessly charging a battery of the earphone box is arranged in the earphone box main body, the earphone box upper cover is rotatably connected with the earphone box main body through the metal rotating shaft, and the metal rotating shaft comprises an upper rotating shaft assembly and a lower rotating shaft assembly. The upper rotating shaft assembly is clamped with the earphone box upper cover, the lower rotating shaft assembly is clamped with the earphone box main body, and the upper rotating shaft assembly and / or the lower rotating shaft assembly of the metal rotating shaft are / is provided with a hollow structure. Preferably, the edge of the upper rotating shaft assembly and / or the lower rotating shaft assembly of the metal rotating shaft is provided with a slotting structure. Different from the existing technical scheme, the embodiment of the invention can solve the problem of heating of the metal rotating shaft during wireless charging only by optimizing the structural design of the metal rotating shaft.

A lithium secondary battery has excellent economic feasibility and safety because an iron phosphate of Formula 2 having an olivine structure is included as a positive electrode active material, and also has advantages of excellent battery performance and lifespan because an electrolyte additive of Formula 1 having a specific molecular weight is included in an electrolyte to improve an increase in internal resistance of the battery during charging and discharging and effectively prevent iron ions from being exsolved from the positive electrode active material.

The invention relates to a composite particle, a positive pole piece, a battery and electric equipment. The composite particle comprises an inner core, a first coating layer and a second coating layer, wherein the inner core comprises lithium iron phosphate; the periphery of the inner core is coated with the first coating layer, and the first coating layer is a carbon layer; the second coating layer is coated on the periphery of the first coating layer, the second coating layer is a metal oxide layer, and the ionic conductivity of the second coating layer is variable.

The present application relates to a kind of vehicle and its regenerative braking auxiliary control method and system, belong to new energy regenerative braking system and engine exhaust brake technical field.The present application obtains regenerative braking request power and battery allowed recharging power when vehicle braking, when regenerative braking request power is greater than or equal to battery allowed recharging power, engine exhaust brake power and drive motor regenerative braking power are determined according to the difference between regenerative braking request power and battery allowed recharging power, drive motor is controlled according to the determined regenerative braking power to carry out regenerative braking, and exhaust brake valve is closed, by controlling generator to drag engine, so that engine speed reaches the speed value corresponding to the engine exhaust brake power, the method can solve the problem of insufficient regenerative braking caused by the limited battery recharging capacity when vehicle is full or battery low temperature, avoid braking feeling inconsistency and regenerative braking failure when long downhill and other problems.

The invention discloses a halide solid electrolyte with electrochemical activity and a preparation method and application thereof, the solid electrolyte is a zirconium-doped ferric lithium chloride solid electrolyte, the chemical general formula of the solid electrolyte is LiFe1-4x / 3MxCl4, M is a metal element with the valence state higher than + 3, 0 lt; xlt; 1. According to the halide solid-state electrolyte with the electrochemical activity, the ionic conductivity order of magnitude is improved, the room-temperature ionic conductivity is improved to 10 <-3 > S / cm from 10 <-6 > S / cm by three orders of magnitude, so that the material is changed from'unavailability 'to'high performance', and the application requirement of an all-solid-state battery is met.

The utility model discloses a linear actuator and a shifter. The linear actuator comprises a motor; a transmission assembly; a screw rod; a tubular telescopic member; the front pulling assembly is mounted at the end part of the tubular telescopic component through a clutch component; wherein the clutch assembly comprises a first connector, a second connector and an elastic component, the first connector and the second connector are kept relatively fixed in the circumferential direction and can relatively move in the axial direction when engaged, and the tubular telescopic component can independently rotate in the axial separation state of the first connector and the second connector. The clutch assembly is arranged between the front pulling assembly and the tubular telescopic component, and the clutch assembly is arranged to be of a structure that the first connector, the second connector and the elastic component are matched, so that if the tubular telescopic component encounters an obstacle in the retraction process, the second connector and the first connector are separated in the axial direction, and the tubular telescopic component idles; the tubular telescopic component is prevented from continuously driving an object connected to the front pull assembly to retract so as not to extrude an obstacle, and the obstacle is also prevented from damaging the linear actuator.

The present invention relates to a separator comprising: a substrate; an inorganic particle layer formed on at least one surface of the substrate; and an adhesive layer formed on at least one of the inorganic particle layers, in which F40 is 1 nN to 30 nN when an adhesive force between a probe of an atomic force microscope having a spring constant of 40 N / m, an average radius of 8 nm, and a scanning speed of 0.5 Hz, measured at a temperature x DEG C of a sample stage, is set as Fx, and the separator satisfies formula 1 below. [Formula 1] F75 / F40 > = 5.

The invention relates to a current collector module and a preparation method thereof, an electrode plate and a battery. The preparation method comprises the following steps: providing a current collector; performing plasma activating treatment on the surface of the current collector; and depositing a bonding enhancement layer on the surface of the current collector subjected to plasma activation treatment to obtain a current collector module, wherein the thickness of the bonding enhancement layer is less than 1 [mu] m. The current collector module prepared by the preparation method of the current collector module provided by the invention has relatively good bonding performance, and can effectively bond the active material layer, so that the electrode plate has relatively good use performance.

The invention discloses a high-hole thin-wall cordierite carrier with good protectiveness and a preparation method thereof.The carrier comprises carrier raw materials and ingredients, and the carrier raw materials comprise, by weight, 28%-35% of spherical flaky mixed talc, 13%-16% of spherical silicon oxide, 16%-19% of flaky aluminum oxide, 8% of fibrous boehmite and 8% of fibrous kaolin; according to the invention, by selecting the morphology and stacking arrangement mode of the raw materials, the internal resistance of the pug under stress slippage is improved, the deformation amount is reduced, and meanwhile, the extrusion performance is improved by introducing the high-temperature-resistant inorganic powder with relatively large particle size and consistent or approximate expansion coefficient.

The present invention relates to a method for inspecting the internal resistance of a secondary battery, which comprises the following steps: a pre-charging step of charging the secondary battery to a set SOC; a discharge measuring step of discharging the secondary battery at a set discharge rate for a set time (t) or longer in a manner to eliminate polarization, component resistance, and reaction resistance; a charge measuring step of charging the secondary battery at a charge rate having the same current value as the set discharge rate for a set time (t) or longer; and an internal resistance calculation step of calculating the internal resistance based on a first voltage value (V ) at a time when the set time (t) has passed in the discharge measuring step. 1 ) and the first current value (I 1 ) and the second voltage value (V 2 ) and the second current value (I 2 ) is used to calculate the internal resistance of the secondary battery.

The utility model relates to the technical field of capacitor heat dissipation, and discloses a heat dissipation capacitor, which comprises a capacitor, a pair of terminal pins are arranged at the top of the capacitor, leads are arranged at the tops of the terminal pins, and a heat dissipation shell is arranged on the outer side of the capacitor. The heat dissipation shell comprises a shell body, installation grooves are formed in the front face and the back face of the shell body, exhaust outlets are formed in the installation grooves, heat dissipation pipes are installed on the inner side of the shell body, separation nets are arranged on the two sides of the shell body, a base is installed at the bottom of the shell body, and a thermoelectric module is installed in the middle of the base. According to the heat dissipation capacitor, the stability of the capacitor can be improved through the heat dissipation shell, temperature change can cause size and property change of internal materials of the capacitor, so that the electrical performance of the capacitor is influenced, heat dissipation can help maintain the stable working temperature of the capacitor, the influence of temperature change on the performance of the capacitor is reduced, and the stability of the capacitor is maintained.

A control system includes a temperature sensor, a heater, a battery control unit, and a control unit. The temperature sensor detects a temperature of a battery mounted on the vehicle. The heater heats the battery. The battery control unit detects a charge state of the battery and controls an operating state of the heater. The control unit controls a drive device that operates with power supplied from the battery, and gives an instruction related to the operating state of the heater to the battery control unit. When the temperature of the battery is lower than a temperature threshold and the charge state of the battery is higher than a predetermined charge level, the control unit gives an instruction to cause the heater to generate heat to the battery control unit. When the temperature of the battery is lower than the temperature threshold and the charge state of the battery is equal to or lower than the charge level, the control unit gives an instruction to stop the heater to the battery control unit and limits power consumption of the drive device.

The invention discloses a phosphate-based positive electrode active material and a preparation method and application thereof, and belongs to the field of secondary battery materials. Wherein the molecular formula of the phosphate-based positive electrode active material is LaFex1Nbx2Mx3 (PO4) y (P2O7) z (TiO3) e / BN (at) C, and the boron-nitrogen doped carbon layer forms a conductive coating layer on the surface of the LaFex1Nbx2Mx3 (PO4) y (P2O7) z (TiO3) e. By mass fraction, the boron-nitrogen doped carbon layer accounts for 1-5% of the positive electrode active material, and the boron-nitrogen element accounts for 0.05-0.2% of the coating layer. The boron-nitrogen compound can improve the electrochemical performance of the positive electrode active material, reduce the temperature in the manufacturing process and ensure the capacity of the active material; in addition, Nb doping can reduce the internal resistance of the battery and improve the cycling stability and the rate capability.

This invention relates to the field of manufacturing electrode materials for thermal batteries, specifically a method for preparing gold-doped sulfide materials. The invention employs a low-temperature hydrothermal method to construct a doped framework, forming a uniform and complete micron- and / or nano-scale Au dopant on the framework. Then, a sulfur-addition process is used to achieve a more stable embedding of the dopant within the FeS2 particles, resulting in excellent thermal stability and high effective discharge capacity when the product is used as a thermal battery. The product obtained by this invention has a discharge specific capacity greater than or equal to 361 mAh / g and an internal resistance less than or equal to 0.102 Ω. The process of this invention is simple and controllable, and the resulting product has excellent performance, facilitating industrial application.

The invention discloses a preparation method of a lithium iron phosphate lithium ion battery and the lithium iron phosphate lithium ion battery. The preparation method comprises the following steps: providing a negative electrode material, wherein the negative electrode material adopts a graphite material prepared by modifying a natural graphite raw material as a negative electrode active material; providing an electrolyte, wherein the electrolyte comprises an organic solvent containing a first additive, a lithium salt and a second additive; the electrolyte comprises the following components in percentage by mass: 10%-13% of lithium salt, 75%-85% of an organic solvent and 3%-8% of a second additive, and the addition amount of the first additive in the organic solvent is 2.5%-4%; wherein the first additive comprises one or more of vinylene carbonate, vinylethylene carbonate or cyclic disulfonate. According to the preparation method, by selecting the negative electrode active material, the electrolyte and the like, the energy density, the low-temperature performance and the charging speed of the lithium iron phosphate lithium ion battery are improved.

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a roll core structure and a lithium ion battery, the roll core structure comprises a first pole piece, a second pole piece and a diaphragm, the first pole piece, the diaphragm and the second pole piece are sequentially overlapped and wound to form a roll core; one of the first pole piece and the second pole piece is provided with a welding slot position, and the surface of the other one of the first pole piece and the second pole piece is sequentially provided with an insulating layer and first insulating glue; the insulating layer and the first insulating glue cover at least one side of the welding slot position in the depth direction, the insulating layer is arranged on the surface of the first pole piece or the second pole piece, and the first insulating glue is close to the welding slot position. By optimizing the roll core structure, the internal resistance of the short circuit of the pole piece can be improved, and the reduction of the heat production during the battery test is facilitated.

The present application is applicable to the field of circuit technology, and provides an ORing FET circuit, power supply, and multi-channel output power supply, wherein the ORing FET circuit includes: a current sampling resistor, an ORing controller, and a first field effect tube; the positive end of the current sampling resistor is connected to the input pin of the ORing controller; the output pin of the ORing controller is connected to the drain of the first field effect tube. Since the input pin and the output pin of the ORing controller collect the voltage in series with the current sampling resistor and the first field effect tube, it is equivalent to increasing the internal resistance of the field effect tube in disguised form, so as to avoid the first field effect tube from being unable to start normally or alternating switching when lightly loaded due to too low a driving voltage.

The utility model provides a kind of pole piece structure, roll core pole group and cylindrical battery, including pole piece body, pole piece body has coating area, several pole lug areas are arranged at interval along the length direction of pole piece body, at least one pole lug area is equipped with at least 2 pole lug arranged at interval between pole lug area, and pole lug is connected to the long side of pole piece body;Pole piece structure is after participating in winding and forms roll core pole group, and the pole lug area on pole piece structure is arranged at radial in the center hole of roll core pole group towards one end surface of roll core pole group. It improves the space utilization of battery shell, improves the infiltration problem of electrolyte, improves internal resistance and heat dissipation, and improves electrochemical performance.