3464 results about "Current collector" patented technology

An electromechanical joint provides rotational movement in at least two dimensions while conducting electrical power between orthogonal hubs. The joint, shaped as a cross, has four conical shafts positioned orthogonally and apart from each other within an interior of a housing. Apexes of the conical shafts face each other proximate a centroid of the housing. A conductive fluid, such as Galinstan, fills recesses between the conical shafts. Separate yokes attached to pairs of the hubs may impart forces on the shafts, causing the shafts to rotate within the conductive fluid around orthogonal axes. The conductive fluid provides simultaneous conduction of electrical power between the hubs. The yokes may be affixed respectively to a current collector and conductive arms of a work machine for improved movement and power conduction without the need for additional components.

Secondary battery, including a positive electrode sheet comprising a positive electrode current collector and a positive electrode film layer, wherein the positive electrode film layer is arranged on at least one side of the positive electrode current collector and the positive electrode film layer comprises a positive electrode active material; a negative electrode sheet, wherein the negative electrode sheet comprises a negative electrode current collector and a negative electrode film layer, wherein the negative electrode film layer is arranged on at least one side of the negative electrode current collector and the negative electrode film layer comprises a negative electrode active material, wherein the negative electrode active material comprises graphite and the powder compaction density of the negative electrode active material at 20,000 N is 1.5 g / cm³ 3 up to 1.85 g / cm³ 3 is; and an electrolyte comprising an organic solvent and an organic additive, wherein the organic solvent comprises a first solvent, the first solvent comprising cyclic carbonate, and the mass fraction of the first solvent, based on the total mass of the electrolyte, is 17% to 34%; wherein the organic additive comprises a first and a second additive, the first additive comprising vinylene carbonate and the second additive comprising an ethylene carbonate derivative, and the mass fraction of the first additive is 1.5% to 8% and the mass fraction of the second additive is 0.5% to 4%, each based on the total mass of the electrolyte.

The invention provides rolling equipment, a current collector, a preparation method of the current collector, a pole piece, a battery and a device. A rolling device comprises a roller mechanism, a flow control mechanism and a power mechanism. The roller mechanism comprises at least two opposite rollers arranged at intervals and a flow control mechanism. The flow control mechanism is used for independently controlling the flow of the cooling medium in each cooling channel; the power mechanism is used for driving at least one roller to rotate. According to the rolling equipment, the roller diameter of the roller can be simply, effectively and flexibly adjusted by controlling the flow, so that the thickness of a rolled membrane material is adjusted, for example, a current collector with a large thickness in a tab area is prepared, the current collector is used for preparing an electrode pole piece, the problem of belt breakage in mass production of the electrode pole piece can be solved, and the production efficiency of the electrode pole piece is improved. And the yield of electrode plate production is improved.

The invention provides a preparation method of a bipolar current collector based on a selective double-sided modified masking film. The preparation method comprises the following steps: depositing a Ni-Cr alloy layer on a single side surface of an aluminum substrate; one side of the masking film is etched to form a roughened surface, and the other side of the masking film is hydrophobic to form a hydrophobic surface; the roughened surface of the masking film and the surface, without the Ni-Cr alloy layer, of the aluminum matrix are pressed, and the edge is coated with curing glue; and placing the pressed and glued sample in an electroplating solution to electroplate a copper layer, finally cutting off an edge glue sealing area, and stripping the masking film. According to the preparation method, the masking film used for protecting the back surface of the aluminum substrate is subjected to double-sided differential treatment, the edge sealing technology is matched, and the Ni-Cr alloy is adopted for bottoming, so that the adhesive force between the copper plating layer and the aluminum substrate is improved, the risk of causing corrosion of a primary battery is reduced, the bipolar current collector which is firmly combined and has a pure interface can be prepared, and the service life of the bipolar current collector is prolonged. And a feasible solution is provided for realizing light-weight and high-performance current collectors for electronic devices such as lithium batteries and the like.

The utility model provides a battery negative pole piece and battery, battery negative pole piece includes current collector and active layer, active layer is coated on current collector at least one side surface, on the active layer is equipped with a plurality of groove structure along the length direction of current collector, groove structure extends along the width direction of current collector, and the groove structure is equipped with the groove structure. The active layer is divided into a plurality of areas by the plurality of groove structures along the length direction of the current collector, and each area is provided with a plurality of hole structures. According to the battery negative plate, the hole structures and the groove structures which are sequentially and alternately arranged in the length direction of the current collector are adopted, the liquid injection time of the battery is shortened, meanwhile, the liquid retention amount of electrolyte is increased, the wettability of the electrode is improved, the cycle life is prolonged, the service life of the battery is prolonged, and the performance stability of the battery is improved; and the problem that the battery performance is influenced due to poor wettability of the battery negative plate in the prior art is solved.

The invention provides a positive pole piece, a solid-state battery and a preparation method of the positive pole piece, and belongs to the technical field of secondary batteries, and the positive pole piece comprises a positive current collector and a positive active material layer. Wherein the positive electrode active material layer is arranged on the positive electrode current collector, the interface layer is arranged on the positive electrode active material layer, the interface layer comprises a first polymer, and the first polymer comprises polyether sulfonate. According to the positive pole piece provided by the invention, the polymer interface layer formed by cross-linking polyether sulfonate is arranged on the surface of the positive active material layer, so that the interface contact and ion transmission efficiency between the positive pole piece and the solid electrolyte membrane are effectively improved based on good ionic conductivity, chemical stability and mechanical flexibility of the interface layer; the interface impedance between the positive pole piece and the solid electrolyte membrane is reduced, and the side reaction of a contact interface is inhibited, so that the rate capability and the cycle life of the solid-state battery are effectively improved.

A battery comprising at least one current collector including a first surface and a second surface opposite the first surface, where the at least one current collector is characterized by a longitudinal body section and a lateral body section extending from the longitudinal body section, a first active material positioned on the first surface on the longitudinal body section, and a second active material positioned on the first surface on the lateral body section.

The application discloses a battery current collector coating device, which comprises a frame, a conversion mechanism, a pole piece, a cylinder, a cylinder rod, a transfer box, a suction pump, a material storage mechanism, a sliding cylinder, a sliding pipe, a guide block, a guide groove, a spring and a spray channel. The frame is provided with the conversion mechanism, the conversion mechanism is provided with the pole piece, the frame is fixedly provided with the cylinder, the cylinder rod of the cylinder is in sliding connection with the frame, the cylinder rod is welded with the transfer box, the transfer box is in contact with the frame, the frame is fixedly provided with the suction pump, the suction pump is connected with the transfer box through a hose, the frame is provided with the material storage mechanism, the sliding cylinder is welded on the transfer box, the sliding pipe is in sliding connection in the sliding cylinder, the spring is arranged in the sliding cylinder, and the sliding pipe is provided with the spray channel at the tail end. The application relates to a battery current collector coating device and a coating process thereof, and has the characteristics that tailing phenomenon is not easy to occur during pole piece coating and the pole piece coating is more uniform.

The invention discloses a composite cathode and anode plate made of a lead-carbon composite material, the composite cathode and anode plate comprises a current collector, a transition layer and an active layer which are compounded in sequence, the transition layer tightly coats the outer surface of the current collector, the active layer tightly coats the outer surface of the transition layer, and the composite cathode and anode plate is prepared by the following method: S1, preparing the composite cathode and anode plate; raw material pretreatment: placing the carbon material in a vacuum oven; according to the invention, the structural design of the composite negative plate and the preparation process are integrated, so that accurate matching of the raw material ratio and the process parameters is realized, and many defects of the traditional electrode are effectively solved; the three-layer gradient structure improves the interface bonding force, and delamination is avoided; the optimized raw material system and the preparation process have a synergistic effect, so that the hydrogen evolution overpotential is remarkably improved, the internal resistance is reduced, the cycle life is prolonged, the low-temperature performance is improved, the energy density is improved, and a reliable technical scheme is provided for the application of the lead-acid storage battery in the high-end field.

The invention discloses a bipolar current collector and a hot pressing process thereof, and relates to the technical field of bipolar current collectors. The bipolar current collector hot-pressing process comprises the following specific steps: performing asynchronous hot-pressing of'partition coating-independent rolling 'on the A / B surface of a bipolar current collector through sectional gradient temperature control, and cooling to obtain a product. According to the hot pressing process provided by the invention, the problem of'hemming 'in the prior art is solved, and the battery performance is remarkably improved.

The invention provides a pole piece, a solid-state battery, a battery pack and electric equipment, the pole piece comprises a current collector and an active material layer arranged on at least one side of the current collector, the surface of the active material layer is provided with a concave part, the depth of the concave part is smaller than the thickness of a negative active layer, the concave part is filled with a filler, and the filler comprises a first solid-state electrolyte. The pole piece can effectively improve the first coulombic efficiency and the rate capability of the solid-state battery.

A columnar secondary battery includes an electrode assembly. The electrode assembly includes a negative electrode plate. The negative electrode plate includes a negative current collector. A surface of the negative current collector facing away from a winding center of the electrode assembly is coated with a first negative electrode material layer. Along a length direction of the negative electrode plate unwound and along a winding direction of the electrode assembly, the first negative electrode material layer includes a first section and a second section connected sequentially. Based on a length of the first negative electrode material layer, a length of the first section accounts for 9% to 75%, and a length of the second section accounts for 25% to 91%. A plurality of first stripes are provided on the first section, and a plurality of second stripes are provided on the second section.

Provided in the present disclosure are a negative electrode sheet, a secondary battery, an electric device, and a negative electrode active material and a preparation method therefor. The negative electrode sheet comprises a negative electrode current collector and a negative electrode film layer located on at least one surface of the negative electrode current collector, wherein the negative electrode film layer comprises a negative electrode active material. The negative electrode active material comprises first artificial graphite and second artificial graphite, wherein the first artificial graphite comprises primary particles, and the second artificial graphite comprises secondary particles. The powder OI value of the negative electrode active material is 2.5-6.5; and the powder compaction density of the negative electrode active material under a pressure of 50,000 N is 1.75-1.94 g / cc.

The invention provides a current collector, a secondary battery and an electric device. The current collector comprises two surface layers and a middle layer arranged between the two surface layers; the middle layer comprises a first element, and the first element comprises one or more of Fe, Zn, Pb and Mg; the surface layer comprises a second element, and the second element comprises one or more of Ni, Cr, Mo, Sn, Cu, Bi, W and Co; and the bonding strength between the surface layer and the middle layer is greater than 100N / m.

The invention relates to the technical field of batteries, in particular to an electrode assembly, a preparation method and a lithium ion battery, the electrode assembly comprises a positive pole piece, a negative pole piece and a diaphragm, the positive pole piece comprises a positive current collector and a positive active material layer, and the positive active material layer comprises a positive active material layer and an inorganic coating; the positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer comprises a positive electrode active material, and the positive electrode active material comprises a ternary positive electrode material of which the core nickel content is more than 80 at% and the shell manganese content is 10-20 at%; the negative active material comprises silicon-based active particles and a three-dimensional elastic conductive network layer coating at least part of the surface of the silicon-based particles, and the positive active material and the negative active material are improved, so that various properties of the electrode assembly are good and stable, the overall electrical property and safety of the battery are improved, and the cycle life of the battery is prolonged.

The invention provides a secondary battery and an electrochemical device, and relates to the technical field of batteries. The negative pole piece in the secondary battery comprises a negative current collector; the first active layer is arranged on the surface of at least one side of the negative electrode current collector, and the first active layer comprises a first silicon-carbon negative electrode material with the sphericity degree of A1; the second active layer is arranged on the surface of the first active layer, and the second active layer comprises a second silicon-carbon negative electrode material with the sphericity degree of A2; a2gt is satisfied; a1; the diaphragm comprises a polymer base membrane and a porous ceramic layer arranged on the surface of one side of the polymer base membrane, and the porous ceramic layer is opposite to the second active layer. The energy density of the secondary battery disclosed by the invention is above 750Wh / kg; the K value is less than 0.05 mV / h; the capacity retention ratio after 500 cycles at the normal temperature of 25 DEG C is 90% or above; and the capacity retention ratio after 500 cycles at the high temperature of 45 DEG C is more than 80%.

The invention discloses a current collection line cable fire-fighting insulation protection device capable of adjusting the clamping distance, and belongs to the field of current collection line cable fire-fighting insulation protection. The protection device comprises at least two fireproof insulation shell assemblies, and the shell assemblies are of split structures and are used for wrapping independent cables respectively; the self-adaptive clamping mechanisms are arranged in the shell assemblies and used for clamping the cables in the radial direction; the distance adjusting mechanism is transversely arranged; the distance adjusting mechanism comprises a plurality of sets of X-shaped hinge plates which are hinged to one another, dovetail grooves are formed in the bottom of the shell assembly, dovetail blocks used for being matched with the dovetail grooves are fixedly connected to end hinge points of the X-shaped hinge plates, and a driving piece is arranged in one dovetail groove. Through the design of the distance adjusting mechanism, mechanical locking and accurate adjustment of the transverse center distance between the adjacent fireproof insulating shell assemblies can be realized, and faults such as insulation failure and fireproof failure caused by mutual approaching and contact of the adjacent shell assemblies under the action of external force are avoided.

The invention provides a positive plate, a battery and electronic equipment. The positive plate comprises a positive current collector and a positive active layer positioned on at least one surface of the positive current collector; the positive electrode active layer comprises a first positive electrode active layer and a second positive electrode active layer which are sequentially stacked in a direction far away from the positive electrode current collector; the first positive electrode active layer comprises a first positive electrode active material, and the first positive electrode active material comprises lithium manganese iron phosphate and a lithium oxide compound; the second positive electrode active layer comprises a second positive electrode active material, and the second positive electrode active material comprises a lithium oxide compound and nickel cobalt lithium manganate. When the positive plate is applied to the battery, the battery is not easy to generate gas during high-temperature storage, so that the safety performance of the battery is improved.

The invention provides a zinc oxide nanosheet modified copper-based current collector as well as a preparation method and application thereof, and relates to the technical field of lithium batteries. According to the zinc oxide nanosheet modified copper-based current collector, uniform deposition of lithium is effectively induced in the circulation process, dendritic crystal growth is inhibited, volume expansion is relieved, and the zinc oxide nanosheet modified copper-based current collector structurally comprises a copper foil substrate and a zinc oxide nanosheet modified layer which is of a three-dimensional porous structure and covers the surface of the copper foil substrate; the thickness of the matrix is 6-500 [mu] m, the thickness of the zinc oxide nanosheet modification layer is 1-1.5 [mu] m, and the pore size of the porous structure is 210-250 nm; the zinc oxide crystal phase is of a hexagonal wurtzite structure. The preparation method disclosed by the invention is obviously superior to the existing high-temperature heat treatment oxidation technology in the aspects of reaction conditions, morphology regulation and control, lithium affinity, process cost, environmental friendliness and the like, provides a simple, convenient, efficient and green new way for preparing the high-performance lithium metal battery negative electrode current collector, and has important technical progress significance and wide application prospects.

The invention provides a high-safety flexible pole piece, a preparation method and a flexible lithium ion battery, the pole piece comprises a current collector and a coating arranged on the surface of the current collector, the coating comprises a flexible isolation structure and a plurality of electrode units, the flexible isolation structure constructs a plurality of accommodating areas isolated from each other on the surface of the current collector, the number of the electrode units is multiple, and the flexible isolation structure is arranged in the accommodating areas. The plurality of electrode units are respectively and independently arranged in different accommodating areas. According to the invention, accurate prevention and control of thermal runaway are realized through the electrode structure design of partition isolation and a material system with multiple hydrogen bonds synergistic effect. The electrode is divided into independent units by the flexible isolation structure, so that heat spreading is effectively blocked; and a hydrogen bond network formed by the hydroxyl-containing comonomer I, PI, PET and hexaphenoxy cyclotriphosphazene significantly enhances the interface stability and flame retardant efficiency of the electrode and the isolation structure, and improves the intrinsic safety of the battery while ensuring the flexibility of the battery.

The present disclosure relates to an electrode for an electrochemical device, and more particularly, to a dry electrode and a method for manufacturing the same. According to an aspect of the present disclosure, there is provided a new method for manufacturing a dry electrode free of wrinkles in an uncoated portion having no electrode active material layer on a current collector.

This application provides a negative electrode sheet, a secondary battery, and an electrical device. The negative electrode sheet includes a current collector and a negative electrode film. The negative electrode film includes: a first film layer disposed on one or both sides of the current collector; and a second film layer disposed on the side of the first film layer away from the current collector. The negative electrode active materials in the first and second film layers each independently include silicon-based negative electrode materials, and the silicon-based negative electrode material in the second film layer includes porous silicon negative electrode materials. The content of silicon-based negative electrode material in the first film layer is less than the content of silicon-based negative electrode material in the second film layer. This improves the charging capacity and cycle performance of the secondary battery.

The invention discloses a supercapacitor with a honeycomb structure and a preparation method thereof, the supercapacitor comprises a positive current collector, a negative current collector and a honeycomb energy storage layer, and the positive current collector and the negative current collector respectively cover two opposite surfaces of the honeycomb energy storage layer; the honeycomb energy storage layer is formed by folding, stacking and fixing a plurality of composite films, each composite film comprises a first electrode layer, an electrolyte layer and a second electrode layer, and the first electrode layer, the electrolyte layer and the second electrode layer are sequentially stacked and are respectively compounded and fixed through a bonding layer. The preparation method comprises the following steps: firstly, sequentially compounding and fixing the first electrode layer, the electrolyte layer and the second electrode layer to form a composite membrane with a sandwich structure, coating an adhesive on the single side surface of each composite membrane at intervals, and then stacking and stretching a plurality of composite membranes to form a honeycomb core structure; after folding, a positive current collector and a negative current collector are compounded on the two sides of the honeycomb core structure. An energy storage structure and a force bearing structure are organically combined, and the energy storage performance and the mechanical performance are synergistically improved.

The invention discloses a composite pole piece as well as a preparation method and application thereof, and belongs to the technical field of battery materials. The composite pole piece comprises a current collector, an active material layer is arranged on the surface of the current collector, and a low-voltage platform active area and a high-voltage platform active area are arranged in the active material layer at the same time; a micro-crystal lattice formed by a functional additive is arranged between the low-voltage platform active region and the current collector; the functional additive comprises an electric polymer. The low-voltage platform active area and the high-voltage platform active area are arranged on the same current collector, so that the advantages of different active materials can be concentrated on the same pole piece, and the performance advantages of the active materials can be fully exerted; when the battery is in an overcharge environment, the micro-crystal dot matrix arranged in the composite pole piece can directly absorb, consume and convert overcharge current on the current collector, and quickly responds to and participates in overcharge protection of the material. The battery with the composite pole piece can have relatively high battery energy density and rate capability, relatively long cycle life and relatively good safety.

A joining method includes providing an electrode body that includes electrode plate end portions overlapping each other in a thickness-wise direction of the electrode plate end portions; providing a current collector including a folded portion, the folded portion includes two opposing holding walls that hold the electrode plate end portions of the electrode body in between, and a top portion that connects the two holding walls and includes an opening; and welding the electrode plate end portions to end surfaces of the two holding walls that define the opening by irradiating an edge of the electrode plate end portions with a laser beam in a state in which the edge of the electrode plate end portions held between the two holding walls projects into the opening.

This support film for a semi-solid battery current collector comprises: a base; and an adhesion layer disposed on one surface of the base. The adhesion layer contains a resin A. The melting point of the resin A is not higher than 130°C. The acid value of the resin A is not less than 6 mgKOH / g. A semi-solid battery of the present invention comprises: an outer packaging bag obtained by using said support film; and a plurality of power storage elements that are housed in the outer packaging bag and that are provided adjacent to each other. Each of the power storage elements has a semi-solid electrolyte and a pair of electrodes having a current collector. The adhesion layer of the support film is bonded to the current collector of the pair of electrodes.

The invention discloses a pole piece, an electrochemical device and a pole piece manufacturing method, and relates to the technical field of electrochemical energy storage. The pole piece comprises an active material layer, a current collector and a tab, at least one side of the current collector is coated with the active material layer, the current collector is further provided with an empty foil area, the current collector in the empty foil area is not coated with the active material layer, and the current collector is provided with a first via hole in the empty foil area; the tab is fixed in the empty foil area and connected with the current collector, the tab is provided with a second via hole, and the second via hole is communicated with the first via hole; and the pole piece further comprises a conductive piece, a part of the conductive piece is arranged in the first conduction hole, and the rest part of the conductive piece is arranged in the second conduction hole, so that the tab and the current collector are electrically conducted. According to the pole piece, current can be transmitted through a plurality of dispersed conduction paths, the contact resistance between the tab and the current collector is reduced, and the structural connection strength between the tab and the current collector is enhanced.

The invention discloses a composite aluminum foil current collector coating thickness detection device, and relates to the technical field of coating thickness detection, the composite aluminum foil current collector coating thickness detection device comprises a thickness detection member, the thickness detection member comprises an upper wheel set, a lower wheel set, a detection rack and a laser detector, and the upper wheel set and the lower wheel set are respectively penetrated by an upper shaft and a lower shaft; the detection frame and the lower shaft rotate synchronously to change the inclination angle of the laser detector, and the tensioning wheel can ascend and descend to be used for adjusting the tightness of the composite aluminum foil on the lower wheel set. The two sides of the aluminum foil are clamped and the aluminum foil is transversely stretched, so that the aluminum foil is flatly attached to the measuring wheel. It is ensured that the aluminum foil is in a flat, tight and vibration-free state when passing through a laser measurement point, which is the premise of obtaining accurate measurement data. The whole laser detection frame can be used as a whole, the lower shaft supported by the aluminum foil synchronously rotates to change the angle of incident light, so that a specular reflection light path of ambient light deviates from the laser receiver, laser beams can still keep nearly vertical incidence, and reflected light of the laser beams can be effectively received.

The invention provides a negative electrode current collector, an all-solid-state battery and electric equipment, and particularly relates to the technical field of batteries. The negative current collector comprises a current collector substrate, a first coating and a second coating, wherein the first coating is arranged on the surface of at least one side of the current collector substrate; the second coating is arranged on one side, deviating from the current collector substrate, of the first coating; wherein the first coating comprises a first lithium-philic material, an ion-conducting material and an electron-conducting material, and the ion-conducting material comprises a high-entropy sulfide solid electrolyte; the second coating layer includes a second lithium-philic material. According to the invention, the functionally gradient double-layer composite coating is constructed on the surface of the current collector substrate, so that the problems of non-uniform lithium deposition, high interface impedance and poor cycling stability in the prior art can be effectively improved.

The application relates to a negative electrode sheet, an electrochemical device and an electronic device. The negative electrode sheet comprises a current collector, a first active material layer and a second active material layer between the current collector and the first active material layer, wherein the first active material layer comprises first silicon-based material particles, the second active material layer comprises second silicon-based material particles, the mass percentage content of lithium in the first silicon-based material particles is A%, the mass percentage content of lithium in the second silicon-based material particles is B%, and A > B. The application improves the expansion of the silicon material in the negative electrode sheet to the current collector, alleviates the expansion stress of the electrode sheet, avoids the interface problem caused by the deformation of the current collector, thereby improving the electrode sheet delamination after the cycle, the deformation of the electrode assembly, the cycle expansion, and the effect of improving the energy density and the cycle performance and reducing the cycle expansion.