1883results about "Electrode rolling/calendering" patented technology

The invention provides a pole piece and a manufacturing method thereof, a rolling system and a secondary battery, and the manufacturing method of the pole piece comprises the following steps: coating slurry on a current collector and drying to obtain a dried pole piece; the difference between the thickness of the dried pole piece and the preset thickness after rolling is used as the total rolling reduction; the dried pole piece is subjected to continuous multi-stage rolling, adjacent two-stage rolling is carried out, the percentage of the rolling reduction of the previous-stage rolling in the total rolling reduction is larger than or equal to the percentage of the rolling reduction of the next-stage rolling in the total rolling reduction, and the sum of the rolling reduction of all stages of rolling is equal to the total rolling reduction; in the multi-stage rolling, the rolling reduction of each stage of rolling is gradually reduced on the whole; and the multi-stage rolling is cold pressing. According to the manufacturing method of the pole piece, the multi-stage rolling mode is adopted, the rolling reduction decreasing and roller gap adjusting mode is adopted, the diameter, roughness and hardness of the roller body are combined to adapt to different rolling reduction, and finally the consistency of stress release and the pole piece is achieved.

The invention provides a fast-charging type solid-state lithium battery alloy negative electrode material, a preparation method and a solid-state lithium battery, and relates to the technical field of lithium batteries. The alloy negative electrode material comprises the following element components in percentage by mass: 30-38% of indium In, 30-35% of tin Sn, 28-35% of bismuth Bi and 0-1.5% of doping elements, crystal phases formed by the alloy negative electrode material of the fast-charging type solid-state lithium battery at least comprise two crystal phases, namely InSn4 and InBi. The alloy negative electrode material has relatively high surface capacity, lithium ion conductivity and lithium ion diffusion coefficient, lithium dendrites do not grow on a negative electrode when a solid-state lithium battery assembled by the alloy negative electrode material is charged and discharged under high current density, and the battery is high in energy density and long in cycle life.

The invention discloses a novel lithium battery pole piece coating machine, which belongs to the technical field of coating machines, and comprises a coating machine body, and an unwinding device, a scratch monitoring device, a tensioning device, a sectional rolling assembly, a cutter assembly, a continuous rolling assembly, a coating assembly and a winding device which are sequentially arranged in the winding direction of a pole piece from front to back, the scratch monitoring device comprises a supporting rod fixed to the coating machine body, the length direction of the supporting rod is consistent with the width direction of the pole piece, and a plurality of linear array cameras are evenly arranged on the lower side of the supporting rod in the length direction at intervals; the sectional type rolling assembly comprises a main motor, an output shaft and a pressing roller, the output shaft comprises multiple sections of supporting shafts which are sequentially connected in the axial direction, and the two ends of each supporting shaft are connected with a first hinge joint and a second hinge joint correspondingly. According to the lithium battery pole piece coating device, protrusions and recesses on the surface of the lithium battery pole piece can be treated in time, and the uniformity of the subsequent pole piece during coating is improved.

A method for manufacturing an anode electrode includes rolling a first aluminum foil layer; annealing the first aluminum foil layer to create a first annealed aluminum foil layer; mechanically bonding a first lithium metal foil layer between an anode current collector and the first annealed aluminum foil layer; and aging the anode electrode to prelithiate the first annealed aluminum foil layer.

The invention discloses a method for retarding black spot wrinkles of a PMMA (Polymethyl Methacrylate) gluing diaphragm lithium battery pole piece, which comprises the following steps: S1, adjusting parameters of a winding machine, adjusting the distance between pole pieces and tabs according to different parameters, and winding a battery cell; s2, performing hot pressing on the wound roll core by using different hot pressing parameters; s3, the hot-pressed roll core is assembled, put into a shell and fully charged in a capacity grading mode; wherein the parameter of the winding machine is embossing pressure; the hot pressing parameters comprise temperature, pressure and time. Therefore, by selecting the most appropriate embossing pressure and hot pressing parameter, black spots and wrinkles on the lithium battery interface of the PMMA glued diaphragm can be relieved, so that the electrochemical performance and the safety performance of the battery are improved.

Proposed is an apparatus and method for manufacturing a dry electrode sheet. The apparatus includes a material feeder supplying an electrode material, a pair of sheet forming rollers facing each other and forming an electrode sheet by pressurizing the electrode material supplied from the material feeder, a first force sensor connected to each of the sheet forming rollers and measuring a force applied to each of the sheet forming rollers, a thickness sensor measuring a thickness of the electrode sheet, a gap adjuster connected to each of the sheet forming rollers and adjusting the gap between the sheet forming rollers, and a controller controlling the gap adjuster to adjust the gap between the sheet forming rollers on the basis of a force value measured by the first force sensor so that the thickness of the electrode sheet received from the thickness sensor matches a target value.

The invention provides an anti-sticking roller self-cleaning pole piece pressing device for lithium battery production, which comprises a supporting plate and two groups of supporting rods symmetrically arranged on the top surface of the supporting plate, an operation part is arranged between the two groups of supporting rods, a plurality of groups of vertically parallel pressing roller pieces are arranged in the operation part, the two ends of the pressing roller pieces are connected with the supporting rods, and one group of pressing roller pieces is connected with the supporting rods in a sliding manner. A driver for driving the support rod to move and rotate is arranged on one side of the support rod; cleaning parts are arranged on the two sides of the supporting plate, an operation part is located between the cleaning parts, a cleaning assembly comprising a mounting frame and two sets of scrapers is arranged in each cleaning part, the scrapers scrape and press roller impurities, the mounting frames are connected with the supporting rods through lead screw structures, and the scrapers are mounted in the frames and make contact with the rollers; and a dry ice spraying part for spraying dry ice particles to the compression roller piece is also arranged in the group of cleaning parts. The device realizes self-cleaning of the compression roller piece through the cleaning assembly and the dry ice spraying part, solves the problems that a traditional device depends on manual cleaning, is low in efficiency and is easy to damage the compression roller, and guarantees the production quality and efficiency of the lithium battery pole piece.

The invention discloses a low-porosity and low-impedance dry positive electrode of a solid-state battery and a preparation method of the low-porosity and low-impedance dry positive electrode. The dry positive electrode of the solid-state battery comprises a large-particle positive electrode active material, a small-particle positive electrode active material, a first conductive agent, a second conductive agent, a third conductive agent, a small-size sulfide solid electrolyte, a large-size sulfide solid electrolyte and a binder. All the components are mixed in a manner of size matching and step-by-step embedding. Size matching among multi-stage particles is introduced, so that the size of gaps among different components is reduced, and the porosity is reduced; the binding agent and part of the conductive agent are premixed to form a'binding-conductive double network ', and then the active material and the electrolyte are gradually embedded, so that the purpose of low impedance of the composite positive electrode is achieved. And finally, the rate capability and the cycling stability of the solid-state battery are improved.

The invention discloses a dry-method electrode film rolling compounding method and dry-method electrode film rolling equipment. The method comprises the following steps: leading out a current collector film from an unpowered unreeling shaft, forming a suspension arc by virtue of self weight, and penetrating through a first roller gap; synchronously unrolling the two dry-method electrode films in an unpowered manner, so that the two dry-method electrode films enter the first roller gap in a self-weight overhanging state and are attached to the two surfaces of the current collector film to form an initial complex; coating the outer side of the initial complex with an isolating membrane to obtain a to-be-heated complex, and enabling the to-be-heated complex to enter a second roller gap after the to-be-heated complex is overhung by self weight; the to-be-heated composite body is subjected to hot-pressing compounding through compounding rollers on the two sides of the second roller gap; and then stripping the isolating membrane and rolling the double-sided dry-method pole piece. According to the method, near-zero tension conveying is achieved through natural suspension, and by matching with isolation film wrapping and one-time double-face pressing of the hot-pressing roller, edge micro-cracking and whole belt breakage of the dry-method electrode film can be effectively avoided, and the interface density and the roll-to-roll production yield are improved.

A method for manufacturing an electrode for a secondary cell, comprising the steps of: providing an electrode substrate comprising an electrically conducting material; forming an active layer on the electrode substrate, wherein the active layer comprises a plurality of carbonaccous particles; exposing the active layer to a magnetic field configured to orient a majority of the particles along a normal of the substrate; and exposing the active layer to laser pulses or mechanical rollers to form a plurality of passages in the active layer, thereby facilitating ionic transport towards the substrate.

The present disclosure relates to a lithium-ion battery component and methods for manufacturing the lithium-ion battery component. The battery component, in some examples, includes a current collector, a porous deposit of first active material and first binder on the current collector, and a solvent-free electrode layer of second active material and second binder laminated with the porous deposit to at least partially occupy the pores of the porous deposit.

The invention provides a mixed negative electrode material. The mixed negative electrode material comprises a silicon carbon material and a graphitized material, the silicon-carbon material takes porous carbon as a matrix, and a silicon layer and an ordered layered carbon layer are sequentially deposited on the surface of the porous carbon matrix; the compaction density of the mixed negative electrode material is 1.0-2.0 g / cm < 3 > and the conductivity is 0.80-118 S / cm under the pressure of more than or equal to 5 Mpa; the ratio of the mass ratio of the graphitized material to the mass ratio of the silicon-carbon material is greater than or equal to 1.6 and less than or equal to 8.5, and the particle size Dv10 of the mixed negative electrode material is 1.1-5.2 mu m; dv50 is 5.3 [mu] m to 16 [mu] m; dv90 is from 16 [mu] m to 35 [mu] m; the porosity of the mixed negative electrode material is 0.005%-0.1%; the specific surface area is 1.2-3.2 m < 2 > / g, and the surface of the negative electrode is provided with a cutting area. The problems that the negative electrode interface stability is reduced, the impedance is increased, the lithium ion conducting capacity is low, and the battery cycle performance is poor are solved.

A system and methods for manufacturing a dry electrode for an energy storage device are disclosed. The system includes a first dry electrode material delivery system configured to deliver a dry electrode material, a first calendering roll, a second calendering roll, and a controller. The second calendering roll is configured to form a first nip between the first calendering roll and the second calendering roll. The first nip is configured to receive the dry electrode material from the first dry electrode material delivery system, and form a dry electrode film from the dry electrode material. The controller is configured to control a rotational velocity of the second calendering roll to be greater than a rotational velocity of the first calendering roll. The method may include providing a multi-roll calender system comprising a first calender roll, a second calender roll; rotating the first calendering roll at a first rotational velocity; rotating the second calendering roll at a second rotational velocity; providing a first dry electrode material to a first nip between the first calendering roll and the second calendering roll to form a dry electrode film. The second rotational velocity may be greater than the first rotational velocity.

The invention discloses a preparation method of a high-performance modified dry-method electrode and application of the high-performance modified dry-method electrode in a lithium metal battery, the method comprises the following steps: step 1, heating and hot-melting succinonitrile under a hydrothermal condition to obtain clear and transparent liquid, and then adding lithium salt into the clear and transparent liquid to complete preparation of a dry-method modified additive; 2, premixing a positive electrode material, vapor-phase growth carbon fibers and a dry-method modified additive; 3, adding an adhesive into the premixed material to obtain a modified dry-method electrode material; and step 4, pouring the modified dry-method electrode powder into a mortar, after preliminary film formation, gradually thinning to 60-75 m in thickness under a roller press, and finally performing hot rolling with a current collector to complete the preparation of the modified dry-method electrode. According to the invention, by adding the additive into the dry electrode, an excellent high-voltage-resistant electrode interface is constructed, and the lithium ion conduction rate of the electrode is improved, so that the electrochemical performance of the dry electrode is further improved, and the application of the dry electrode in a high-voltage lithium metal battery is promoted.

This application provides a battery electrode detection and control system that can improve the yield of electrode sheets. The electrode detection and control system is applied to an electrode coating system, which includes an unwinding device, a first-side coating device, a first-side drying device, and a winding device arranged in sequence. The electrode detection and control system includes a first detection device disposed between the unwinding device and the first-side coating device. The first detection device is used to detect the size of the area to be coated on the first surface of the electrode substrate output by the unwinding device, wherein the first surface is perpendicular to the thickness direction of the electrode substrate.

Generally described, one or more aspects of the present disclosure relate to methods, systems, and devices related to pre-straining bare lanes of a multilane electrode with a system for calendering a multilane electrode including a pre-strain roll device including a plurality of pre-strain rollers and a pressure roller forming a pre-strain nib and a calender roll device comprising a pair of calendering rollers forming a calendering nip positioned downstream from the pre-strain roll device.

A powder dispensing apparatus having an elongate wedge-shaped hopper including one or more fluidized plates is described. The powder dispensing apparatus can be positioned above a pair of calender rolls to distribute a powder, such as a dry electrode material onto the calender rolls. Such fluidized wedge shaped hopper advantageously allows for an accurate and / or controlled rate of powder distribution across or substantially across the length of a calender roll.

The invention relates to the field of lithium ion batteries, and discloses a lithium titanate composite material and a preparation method thereof, a negative pole piece and a preparation method thereof, a lithium battery and a battery pack. The surfaces of lithium titanate particles are sequentially coated with the nitrogen-doped carbon intermediate layer and the two-dimensional MXene material outer layer, and the MXene material outer layer is formed by bridging adjacent particles through hydrogen bonds, so that a'core-shell-bridge 'three-dimensional conductive network structure is constructed, the electronic conductivity of the lithium titanate composite material is remarkably improved, the electron / ion transmission efficiency of the lithium titanate negative electrode is improved, and the lithium titanate negative electrode has a good application prospect. The lithium ion battery has excellent rate capability and cycle performance; and through collaborative optimization of the three-dimensional composite material and the electrolyte, the interface impedance is reduced, and polarization is inhibited, so that the lithium battery still keeps high capacity and long cycle stability under ultrahigh rate, and meanwhile, the problems of discontinuous conductive network and high interface impedance in the prior art are solved. And excellent rate capability and cycle performance can be achieved under ultrahigh rate.

The invention provides a control method and device of a roller press, and belongs to the technical field of batteries. According to the implementation scheme, the control method of the roller press comprises the steps that the measured thickness value of a to-be-measured pole piece obtained by conducting thickness detection on the to-be-measured pole piece is obtained; calculating a thickness deviation value according to the measured thickness value and a target thickness value of the to-be-measured pole piece; in response to the fact that the thickness deviation value is larger than a preset threshold value, the roller pressure adjusting amount is determined based on the thickness deviation value and a PID algorithm; the roller pressure value of the roller press is corrected based on the roller pressure adjusting quantity, and the roller press is controlled to conduct rolling operation on the to-be-measured pole piece through the corrected roller pressure value; and repeating the steps until the thickness deviation value is smaller than or equal to a preset threshold value.

A positive electrode for a secondary battery including a positive electrode current collector, and a positive electrode active material layer supported on the positive electrode current collector. The positive electrode active material layer includes active material particles and an oxide film covering at least part of surfaces of the active material particles. The active material particles include a lithium-containing transition metal oxide, and the oxide film contains an oxide of a first element other than nonmetal elements. When a thickness of the positive electrode active material layer is denoted by TA, Tb<Tt is satisfied, where the Tb and the Tt are thicknesses of the oxide film at a position of 0.10TA and at a position of 0.90TA, respectively, from a surface of the positive electrode current collector in the positive electrode active material layer.

Calendering methods that accurately and / or precisely calender dry electrode films, and systems thereof, are described. The methods and systems are able to control the calendering nip and / or calendering distance between the calendering rollers with and / or without the presence of an electrode film and / or electrode powder mixture such that the variation of the calendering distance is reduced.

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.

A dry electrode and a manufacturing method thereof are disclosed. The method includes preparing a first positive electrode active material Lia1Fex1B1-x1PO4-b1, a second positive electrode active material Lia2Nix2COy2Dz2O2-b2, a dry binder, and a dry conductive material; grinding the dry binder at 10° C. or less; forming a first mixture by mixing a first portion of the first positive electrode active material, the second positive electrode active material, the dry conductive material, and the grinded dry binder; forming a second mixture by mixing a second portion of the first positive electrode active material with the first mixture; forming a positive electrode active material layer by forming a film from the second mixture; and performing a lamination of the positive electrode active material layer on a positive electrode current collector.

This application provides a composite electrode, its preparation method, and a lithium-ion battery. The preparation method of the composite electrode includes the following steps: conveying an electrode sheet through an electrode sheet unwinding mechanism, such that the electrode sheet passes through the gap between a heating mechanism and a shaping roller assembly; conveying a solid electrolyte membrane through a solid electrolyte membrane unwinding mechanism located beside the electrode sheet unwinding mechanism, such that the solid electrolyte membrane passes through the gap between the shaping roller assembly and the electrode sheet; preheating the electrode sheet through the heating mechanism to obtain a preheated sheet; and rolling the preheated sheet and the solid electrolyte membrane together through the shaping roller assembly to prepare the composite electrode. The method in this application addresses the issues of good composite effect, inconsistent transverse compaction density, and poor transverse thickness consistency in the composite electrode.

An example electrode for a battery is provided, as well as a system and method for fabrication of an electrode for the battery. The electrode includes an electrically conductive substrate defining a first surface and a second surface. The electrode includes a pattern of an active material coating formed on at least one of the first or second surface of the electrically conductive substrate. The pattern includes coated and uncoated areas formed by depositing an active material dry powder onto at least one of the first surface or the second surface of the electrically conductive substrate via electrostatic spray deposition during movement of the electrically conductive substrate, and selectively removing at least a portion of the active material dry powder from at least one of the first surface or the second surface of the electrically conductive substrate with a powder removing assembly to create the uncoated areas of the pattern.

Example embodiments provide a secondary battery manufacturing system. The secondary battery manufacturing system includes a server configured to store a roll map including defect data indicating a defect of an electrode roll and datum point data indicating a datum point on the electrode roll, a controller configured to load the defect data and the datum point data from the server, and a datum point sensor configured to generate a datum point sensing signal by sensing the datum point on an electrode sheet unwound from the electrode roll, in which the controller is configured to generate datum point sensing data based on the datum point sensing signal and compare the datum point data with the datum point sensing data.

The present disclosure relates to an electrode (1) for a secondary lithium metal battery, the electrode comprises: a current collector (2), an anode metal layer (3) comprising lithium, and at least one graded metal alloy layer (4a,4b) that extends along one or more opposing faces of the anode metal layer. The graded metal alloy layer comprising a mixture of lithium and a further metal composition, whereby the concentration of lithium relative to the further metal composition decreases outwardly from the anode metal layer. The disclosure further relates to a battery comprising the electrode and a method of manufacturing.

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.

A system and methods for manufacturing a dry electrode for an energy storage device are disclosed. The system includes a first dry electrode material delivery system configured to deliver a dry electrode material, a first calendering roll, a second calendering roll, and a controller. The second calendering roll is configured to form a first nip between the first calendering roll and the second calendering roll. The first nip is configured to receive the dry electrode material from the first dry electrode material delivery system, and form a dry electrode film from the dry electrode material. The controller is configured to control a rotational velocity of the second calendering roll to be greater than a rotational velocity of the first calendering roll. 62385256

Generally described, one or more aspects of the present disclosure relate to methods, systems, and devices related to a powder dispensing system, including a pair of calender rolls, a first conical hopper and a second conical hopper positioned above the pair of calender rolls, each hopper having a first temperature controlled fluidized section, a first flow control system in fluidic connection with the first temperature controlled fluidized section, and a second flow control system in fluidic connection with the second temperature controlled fluidized section, a vertical linear actuator configured to adjust a distance between the first conical hopper, the second conical hopper and the pair of calender rolls, and a horizontal linear actuator positioned between the first conical hopper and the second conical hopper.