3591results about "Electrode rolling/calendering" patented technology

The invention discloses a dry-method electrode film and a preparation method thereof, an electrode and a battery, and belongs to the technical field of batteries. The method comprises the following steps: mixing polytetrafluoroethylene, an active substance and a conductive agent, and crushing to obtain a crushed mixture; performing primary airflow grinding and shearing on the crushed mixture to obtain a ground and sheared mixture; the primary shearing conditions are as follows: the airflow temperature is-10 to 10 DEG C, the airflow pressure is 0.7 to 0.9 MPa, and the rotating speed is 8000 to 12000 rpm; carrying out secondary airflow grinding, shearing and fibration on the ground and sheared mixture to obtain a fibration material; and carrying out secondary fibration treatment on the fibration material to obtain the dry-method electrode film. The method can significantly improve the tensile strength of the electrode film, improve the liquid absorption rate of the electrode and reduce the resistivity of the electrode.

The embodiment of the invention provides an online detection method and system for extension information of a pole piece and a roller press, relates to the technical field of battery production, and at least solves the problem that the extension rate of an empty foil area is detected mainly through offline detection, manual visual detection and the like in the related technology. The problems of low detection efficiency, poor real-time performance, low accuracy, much material waste and the like exist in the prior art. The online detection method comprises the steps that extension information of a current pole piece is determined based on first identification information of the current pole piece and second identification information of the current pole piece, and the first identification information is determined based on a first image, collected by a first visual detection system of the roller press, of the current pole piece; the roller press comprises an unwinding mechanism, a marking mechanism, a first visual detection system, a rolling mechanism, an extension mechanism, a second visual detection system and a winding mechanism which are sequentially arranged in the conveying direction of the pole piece, and the second identification information is determined based on a second image, collected by the second visual detection system, of the current pole piece.

Examples include a device for coating a carrier substrate with a powdered material. The device includes an application unit having a first roller and a second roller which, at a nip thereof, form a first gap through which a powder mixture can be conveyed to form a dry film. A counter-pressure roller, together with the second roller or another roller arranged between the counter-pressure roller and the second roller, forms a second gap through which the carrier substrate to be coated can be guided for having the dry film applied to the carrier substrate. The first gap between the first and second rollers can be adjusted based on a position-based positioning drive by being set to a constant and / or defined gap width, and the second gap can be adjusted based on a force-based positioning drive, and can be set to a constant and / or defined contact force or linear force.

An electrode manufacturing system includes a transferring part, a coating part, a drying part, and a heat treatment part. The transferring part is arranged downstream of the drying part to heat the electrode substrate to a high temperature and includes a transfer roller supports and transfers an electrode substrate in a long-sheet shape. The coating part applies an electrode slurry to an electrode current collector. The drying part dries the electrode slurry disposed on the electrode substrate. The heat treatment part is disposed downstream of the drying part along a transfer direction of the electrode substrate and applies heat to the electrode substrate to increase the adhesion of the electrode by changing the crystal phase of the PVdF binder of the electrode substrate during the heat treatment process, thereby preventing the separation of the electrode active material layer. A manufacturing method including the same is also provided.

The rolling device comprises a heat conduction roller and a temperature control mechanism, and the heat conduction roller is provided with an axial end face located at the end and a radial surface located on the circumferential side; the temperature control mechanism is arranged outside the heat conduction roller and located in the axial direction and / or the radial direction of the heat conduction roller, and the temperature control mechanism is used for heating or cooling the axial end face and / or the radial surface of the heat conduction roller. The temperature control mechanism can adjust the temperature of the local deformation area of the heat conduction roller in a targeted manner, so that the surface of the heat conduction roller generates temperature change, and the temperature change can enable the heat conduction roller to generate deformation resisting deflection and thermal expansion due to thermal expansion and cold contraction, so that the problem that the thickness of the local area of a pole piece is thinned due to excessive approaching of the heat conduction roller is solved; therefore, the thickness uniformity of the rolled pole piece is improved. The thickness uniformity of the rolled pole piece is improved.

Apparatus, system and method for simultaneously drying a coating on a substrate using at least two different drying phenomena, for example, inductive heating and convective heating, or inductive heating and a combination of convective heating and infrared heating. A coating on a substrate is dried by generating heat in the substrate while simultaneously applying convective heat and / or radiant heat to the coating. Simultaneous drying refers to drying of the same region of a substrate at the same time, and in a particular embodiment, subjecting the same region of a substrate to inductive heating and convection at the same time. Preferably the substrate is at least partially conductive.

A glassy electroactive prepreg made by generating submicron particles of lithium-ion conducting sulfide glass by providing lithium-ion conducting sulfide glass feedstock material, and subjecting the feedstock material to subzero processing to transform the material into submicron particles can avoid plastic deformation of sulfide glass particles during grinding and produce submicron powders. The prepreg is formed by providing a porous electroactive layer comprising electroactive material, and infiltrating the porous electroactive layer with the submicron particles of lithium-ion conducting sulfide glass. The subzero processing can include cryogenic processing. The prepreg can be used to form glassy embedded electrodes.

The invention provides a positive plate, a battery and a power utilization device, and belongs to the technical field of batteries, and the positive plate meets the formula: 2.5 < = H / PD < = 4.5; wherein H represents the Mohs hardness grade of the positive plate, and PD represents the compaction density of the positive plate. According to the positive plate provided by the embodiment of the invention, the structural stability can be ensured, the material falling and deformation conditions are reduced, the internal stress of the positive plate can be kept in a proper range, the cracking phenomenon of the positive plate is reduced, and the service life of the positive plate is prolonged. When the positive plate provided by the embodiment of the invention is applied to the battery, the cycle life and the stability of the battery can be improved.

The invention relates to the technical field of lithium battery manufacturing equipment, and discloses a rolling thickness control method and device, electronic equipment and a storage medium. According to the method, in the working process of the roller press, the real-time thickness of a machined object of the roller press is measured, the real-time thickness is compared with the target thickness, all adjusting parameters in a PID control algorithm are updated according to the comparison result, and the adjustment amount of the rolling parameters of the roller press is calculated through the PID control algorithm with the updated adjusting parameters. And therefore, closed-loop control on the rolling thickness is realized. In the working process of the roller press, the adjusting parameters of the PID control algorithm are updated on line according to the real-time condition, extra manpower and time do not need to be occupied for updating the adjusting parameters of the control algorithm, manpower and time consumption is saved, the adjusted adjusting parameters can better adapt to the real-time working condition of the roller press, and the working efficiency of the roller press is improved. And the accuracy of controlling the rolling thickness is improved.

The invention relates to an integrated carbonaceous honeycomb framework lithium metal composite negative electrode and a preparation method thereof, and belongs to the technical field of lithium metal batteries, the integrated carbonaceous honeycomb framework lithium metal composite negative electrode is formed by depositing lithium metal in an integrated carbonaceous honeycomb framework host, and the host is constructed by adopting metal salt-colloidal crystal microsphere template precursor preparation, compression molding and controllable carbonization processes. The structure has a highly ordered three-dimensional integrated macroporous skeleton, and can realize rapid transmission and uniform electric field distribution of lithium ions and electrons, so that dendrite-free homogeneous lithium deposition under ultrahigh capacity is realized, volume expansion is remarkably inhibited, and the reversible stability of lithium metal deposition / stripping is improved. The invention provides an efficient and stable negative electrode solution for a high-energy-density lithium battery, and has an important application prospect.

The present disclosure provides a method of manufacturing an electrode using a continuous coating line for applying an electrode coating layer on a substrate surface of a substrate, the continuous coating line comprising a coating apparatus comprising a coating head and a coating fluid supply system, and at least one oven comprising a heating element, and a substrate carrier for carrying the substrate, the method comprising continuously carrying the substrate through the continuous coating line using the substrate carrier; continuously applying a battery electrode slurry composition from the coating head to the substrate surface to form a wet coated substrate, wherein the battery electrode slurry composition is continuously fed into the coating head by the coating fluid supply system; and heating the wet coated substrate in the oven to form a dried coating on the substrate.

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.

Examples include a machine for producing a multi-layer product having a dry film applied to a carrier substrate. A carrier substrate web is provided to an application stage where a first dry film of powdered material is applied to a side of the carrier substrate. The carrier substrate web having the dry film on at least one side is then fed to a product winder to produce a product roll. A dancer roller and / or a positively driven draw roller are arranged between a location where the carrier substrate web unwound from a reel and an entry into an application gap of the application stage, and / or a dancer roller and / or a positively driven draw roller are arranged between where the substrate emerges from a last application gap of the application stage and a location at which the winding of the carrier substrate web onto the product roll takes place.

A method 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 invention relates to a coating system (1) for dry coating a carrier film (2) for producing an electrode (3) for a storage cell of an electrical energy storage device, with at least one first roller calender (5) for providing the carrier film (2) on at least one side (9) of the carrier film (2) with a first coating (6), wherein at least one second roller calender (13) is provided for providing the carrier film (2) on the first coating (6) with a second coating (14).

The invention discloses a composite copper foil current collector and a preparation method thereof, a negative electrode, a lithium ion battery and electric equipment, and belongs to the technical field of batteries. The composite copper foil current collector comprises a polymer composite layer which comprises a polymer layer and a conductive material layer, the polymer layer has two opposite surfaces, and the conductive material layer is attached to at least one surface of the polymer layer; the polymer composite layer is provided with a first surface and a second surface which are opposite; and the copper layer is attached to the first surface and the second surface of the polymer composite layer. The conductive material is introduced to the surface of the polymer base material and then copper plating is performed, so that the binding force is stronger compared with the binding force between the polymer and copper; meanwhile, the conductive material is compounded on the polymer base material and replaces part of the polymer insulating material to form a coherent conductive network, so that the composite copper foil current collector has higher conductivity; volume expansion hardly occurs in the charging and discharging process, active substances are prevented from falling off from the current collector, and the cycling stability of the battery is improved.

The invention belongs to the technical field of battery manufacturing, and particularly relates to a pole piece compounding device, naked battery cell winding equipment and a naked battery cell winding method. The pole piece compounding device comprises a first compounding roller assembly, a second compounding roller assembly and a third compounding roller assembly, the first compounding roller assembly comprises a first compounding roller and a second compounding roller, the first compounding roller and the second compounding roller are arranged oppositely, and the first compounding roller and the second compounding roller are used for sequentially compounding a first diaphragm, a first pole piece and a second diaphragm together in a stacked mode; and the side edge diaphragm composite assembly is used for compounding the part, exceeding the side edge of the first pole piece, of the first diaphragm with the part, exceeding the side edge of the first pole piece, of the second diaphragm. The technical scheme provided by the embodiment of the invention aims to solve the problem that the first diaphragm, the first pole piece, the second diaphragm and the second pole piece are easy to fold in the winding process of preparing the naked battery cell, so that the first pole piece and the second pole piece are overlapped.

The invention relates to a preparation method of a multi-porosity gradient multi-layer dry method thick electrode, which comprises the following steps of: stirring and mixing raw materials under the condition that the temperature is less than or equal to 18 DEG C to obtain a premix; quickly shearing the premix and raising the temperature to be less than or equal to 120 DEG C to obtain fiberized powder; the powder is subjected to one-time double-roller hot pressing to form a film continuously, the formed film continuously passes through double rollers and hot pressing to be thinned and then is rolled, multiple layers of films are obtained, and each layer of film has different porosity; the multiple layers of diaphragms with different porosities and the current collector are subjected to continuous double-sided lamination through double-roller hot pressing; the temperature of the double rollers is controlled to be smaller than or equal to 180 DEG C, the pressure of the double rollers is controlled to be 10-200 T, the laminating speed is controlled to be 1-10 m / min, the gap of the double rollers is controlled to be smaller than or equal to 1000 microns, and the multi-layer dry-method thick electrode which is composed of multiple layers of membranes is obtained after rolling, the compaction density of each layer of membrane is different, and the material proportion of each layer of membrane is the same; the method has the advantages that only the compaction density of the pole piece needs to be regulated and controlled, the material ratio does not need to be adjusted, and the interface property is more stable after multiple times of film forming.

The invention discloses a pole piece and a preparation method thereof, a battery and a power utilization system. The pole piece comprises a current collector and an active material layer which are arranged in a laminated manner, the active material layer comprises a plurality of active particles, and the active material layer is further provided with first pores and second pores; the aperture R1 of the first pores and the aperture R2 of the second pores meet the following conditions: 0.05 * D50 < = R1 < 0.65 * D50, 0.65 * D50 < = R1 < = 10 * D50, D50 is the median particle size of the plurality of active particles, and the unit of R1 and R2 is nm. Through the pore distribution structure with matched size, the wettability of the electrolyte in the active material is improved, so that the migration path of ions in the pole piece is optimized, the overall internal resistance of the battery is reduced, and the power performance, the fast charging performance and the low-temperature performance of the pole piece are further improved on the basis of improving the ion mobility.

The invention discloses a lithium battery pole piece dry method manufacturing process and a manufacturing equipment assembly, and the lithium battery pole piece dry method manufacturing process comprises the following steps: a powder material preparation part: mixing raw materials, kneading and fiberizing to form a powder material; the film material preparation part is used for extruding the powder material from a discharging channel to a material receiving surface, a metering gap is formed between the discharging channel and the material receiving surface, and the material receiving surface can move relative to the discharging channel, so that the powder material is spread to the material receiving surface, the powder material on the material receiving surface is rolled, and the powder material is changed into a film material. According to the lithium battery pole piece dry method manufacturing process and the manufacturing equipment assembly, the thickness of a film material can be controlled, the thickness deviation of the film material is reduced, and the influence on the product quality is avoided.

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.

According to exemplary embodiments, provided in a method for generating a roll map. The method comprises the steps of: transmitting process information about an electrode sheet to a processor; updating a measurement condition of the processor on the basis of the process information; and collecting measurement data including measurement values on the basis of a measurement signal generated by measuring the electrode sheet, wherein the electrode sheet includes a plurality of coated lanes and a plurality of uncoated parts; and processing the measurement data on the basis of the measurement condition updated on the basis of the process information.

An electrode assembly for a lithium-ion battery is provided. The electrode assembly may comprise a metal foil having thereon a conductive coating including a polymeric binder and a self-supporting electrode film of active material and fibrillated composite binder laminated with the metal foil such that the conductive coating is between the metal foil and self-supporting electrode film. The fibrillated composite binder may include carbon particles and a same polymeric binder.

Examples include a device for coating a carrier substrate with a powdered material. The device includes an application unit having a first roller and a second roller which, at a nip thereof, form a first gap through which a powder mixture can be conveyed to form a dry film. A counter-pressure roller, together with the second roller or another roller arranged between the counter-pressure roller and the second roller, forms a second gap through which the carrier substrate to be coated can be guided for having the dry film applied to the carrier substrate. The first gap between the first and second rollers can be adjusted based on a position-based positioning drive by being set to a constant and / or defined gap width, and the second gap can be adjusted based on a force-based positioning drive, and can be set to a constant and / or defined contact force or linear force.

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.

The invention provides a preparation method of a lithium-supplemented negative plate, the lithium-supplemented negative plate, a lithium ion battery and an electric device. According to the preparation method, rolling compounding is carried out by controlling the linear speed of a compression roller close to a lithium foil in a roller pair to be always greater than the linear speed of a compression roller close to the negative plate. The linear speed of the compression roller affects the actual tape running speed of the lithium foil and the negative pole piece, so that the lithium foil and the negative pole piece generate speed difference in a roller gap, at the moment, opposite tangential force is provided for the surface of the lithium foil by the roller pair, and the lithium foil can be thinned under the action of the tangential force, so that the lithium foil and the negative pole piece can be compounded, and the lithium foil and the negative pole piece can be thinned. And the lithium foil with the target lithium supplementing thickness can be obtained. According to the preparation method, the limitation on the thickness of the supplied material of the lithium foil is reduced, the lithium supplement of the lithium foil with the thickness of 0.1-5 microns in the lithium supplement negative plate can be realized through one-time processing and forming, the accuracy of the pre-lithium amount is improved, and the method does not need to be protected by a base material, so that the adhesion phenomenon is avoided, the technological process is saved, and the production cost is effectively reduced.

The invention discloses a preparation method of an in-situ solid-state battery structure, which comprises the following steps: 1, mixing a polymer monomer, an initiator and an electrolyte to obtain an in-situ solid-state electrolyte precursor I, and mixing the in-situ solid-state electrolyte precursor I with an inorganic solid-state electrolyte to obtain an in-situ solid-state electrolyte precursor II; an in-situ solid electrolyte precursor II and an in-situ solid electrolyte precursor III are obtained; 2, preparing a positive plate and a negative plate; 3, coating the in-situ solid electrolyte precursor I on the surfaces of the positive plate and the negative plate, standing, curing and rolling to obtain a cured positive electrode and a cured negative electrode; 4, coating the surface of the cured positive electrode with the in-situ solid electrolyte precursor II, coating the surface of the cured negative electrode with the in-situ solid electrolyte precursor III, and standing and curing to obtain a composite positive electrode and a composite negative electrode; and 5, the composite positive electrode and the composite negative electrode are bonded and then cured. The preparation method effectively increases the contact area between the in-situ solid electrolyte and the positive and negative plates, improves the ion conduction efficiency, and is suitable for the technical field of battery preparation.

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.

The utility model provides a heating roller and rolling equipment, and the rolling equipment comprises a roller body, a heating device and a heating device, the multiple heating pieces extend in the length direction of the roller body, and the multiple heating pieces are evenly distributed in the roller body in the circumferential direction of the roller body; the heat pipe assembly is of an annular frame structure, the heat pipe assembly is arranged in the roller body, and the multiple heating pieces are located on the inner circumference of the heat pipe assembly. According to the heating roller, the heat pipe assembly is arranged in the roller body, and the heat pipe assembly has extremely high heat transfer efficiency, so that the heat pipe assembly can quickly transfer heat generated by the heating pieces on the peripheries of the heating pieces in the circumferential direction of the roller body, and the temperature difference of the circumferential surface of the roller body can be effectively reduced; the temperature uniformity of the surface of the roller body is improved; in addition, independent temperature control can be carried out on the multiple heating pieces, and the temperature uniformity of the surface of the roller body can be further guaranteed.