10382results about "Electrode carriers/collectors" patented technology

The present disclosure is to provide a cylindrical secondary battery that facilitates connecting a busbar by having both positive and negative electrodes on one side, and that has highly reliable electrical contact between an electrode assembly and a case. To that end, the present disclosure provides a secondary battery comprising: an electrode assembly; a case for housing the electrode assembly; a current collector plate welded to the electrode assembly and case; and a cap plate, located above the current collector plate, for sealing the case.

A cylindrical secondary battery including an electrode assembly including a negative electrode plate and a positive electrode plate; a cylindrical can accommodating the electrode assembly and including a terminal hole in one side of the cylindrical can and an open inlet in another side of the cylindrical can; a terminal coupled to the cylindrical can through the terminal hole; and a negative electrode current collector in the cylindrical can and electrically connecting the cylindrical can to the negative electrode plate. The negative electrode current collector includes a notch groove or a cutting hole configured to be cut in response to an increase in pressure in the cylindrical can.

Embodiments relate to a cylindrical secondary battery. A cylindrical secondary battery includes an electrode assembly including a first electrode plate, a separator, and a second electrode plate, a case that accommodates the electrode assembly and of which a lower end is opened to be electrically connected to the second electrode plate, a first current collector plate disposed between a top surface of the electrode assembly and the case and electrically connected to the first electrode plate, a terminal which passes through a top surface part of the case and of which a lower end is electrically and mechanically coupled to a top surface of the first current collector plate, and a cap plate configured to seal a lower end of the case. The terminal includes a main body having a flat top surface and a welding groove recessed downward from a top surface of the terminal outside the main body.

The invention provides a secondary battery, a preparation method thereof and an electric device. The secondary battery comprises a copper foil, the copper foil comprises copper crystal grains with different particle sizes, the copper crystal grains comprise copper crystal grains with the particle size smaller than or equal to 0.5 mu m and copper crystal grains with the particle size larger than 0.5 mu m, the number of the copper crystal grains with the particle size smaller than or equal to 0.5 mu m accounts for 70%-95% of the total number of the copper crystal grains, and the number of the copper crystal grains with the particle size larger than 0.5 mu m accounts for 10%-20% of the total number of the copper crystal grains. And the amount of the copper grains with the grain size larger than 0.5 mu m accounts for 5%-30% of the total amount of the copper grains. The current collector has excellent mechanical strength and plasticity.

The invention discloses a carbon-coated current collector and a preparation method thereof, the carbon-coated current collector is a carbon-coated aluminum foil and comprises an aluminum foil and a modified carbon layer on the aluminum foil, the modified carbon layer comprises a binder, a silane coupling agent and a conductive material, and the silane coupling agent is (3-glycidoxy) trimethoxysilane. The specific silane coupling agent is introduced for modification, the adhesive force of a modified carbon layer on the surface of the aluminum foil is improved, the aluminum foil has good hydrophobic performance, and the swelling phenomenon of a battery caused by water is reduced. Meanwhile, the binding power of the positive electrode coating and the current collector is improved, so that the phenomena of powder falling and delaminating of the positive electrode coating are reduced, the attenuation of the battery capacity is reduced, and the service life of the battery is prolonged.

The invention relates to a battery monomer, a battery device and a power utilization device, the battery monomer comprises an electrode assembly, the electrode assembly comprises a positive pole piece, the positive pole piece comprises a positive pole film layer, a positive pole current collecting part and a positive pole lug, the positive pole film layer is arranged on at least one side of the positive pole current collecting part along the thickness direction of the positive pole piece, and the positive pole lug is arranged on the positive pole piece. The positive pole lug is arranged on at least one side of the positive pole current collecting part along the first direction, the positive pole film layer comprises a positive pole active material, the positive pole active material comprises a lithium-containing material with an olivine structure, the single-side coating weight of the positive pole film layer is 200 mg / 1540.25 mm < 2 > to 400 mg / 1540.25 mm < 2 >, and the single-side coating weight of the positive pole film layer is 100 mg / 1540.25 mm < 2 > along the second direction. The distance between a first point of the positive pole current collecting part and the positive pole lug closest to the first point is smaller than or equal to 300mm, the first point is any point of the positive pole current collecting part, and the first direction, the second direction and the thickness direction of the positive pole piece are vertical in pairs. The risk of lithium precipitation of the battery cell can be reduced, and the use reliability of the battery cell is improved.

The invention discloses a high-bonding-strength flame-retardant composite current collector base film and a preparation method thereof. The high-bonding-strength flame-retardant composite current collector base film is prepared from the following raw materials in parts by weight: 100 parts of PP resin, 1.5 parts of a lubricant, 0.8 part of an antioxidant and 16 parts of reinforced flame-retardant composite particles, the reinforced flame-retardant composite particles are prepared by the following steps: S1, preparing amidated porous carbon microspheres; s2, compounding the amidated porous carbon microspheres with mica powder to prepare a composite carrier; s3, loading a flame retardant to prepare a flame-retardant compound; s4, in-situ grafting of maleic anhydride grafted polypropylene is carried out, and the reinforced flame-retardant composite particles are obtained. By adding the reinforced flame-retardant composite particles into the PP resin, the flame retardance and mechanical strength of the PP-based composite current collector base film and the interface bonding force between the PP base film and the metal conductive layer can be comprehensively improved.

The invention relates to an electrode preparation method, an electrode prepared by the method, an energy storage device comprising the electrode and an electrode production system for carrying out the method. The preparation method comprises the following steps: (a) providing a self-supporting electrode film which comprises a first side and a second side opposite to the first side, and the second side comprises a to-be-deposited area on which metal is deposited when the self-supporting electrode film is in contact with an electrolyte for an electrodeposition reaction; (b) providing an electrolyte containing a salt of a metal to be deposited; and (c) contacting at least the region to be deposited of the second side of the self-supporting electrode film with the electrolyte, and performing an electrodeposition reaction in the region to be deposited, thereby depositing a current collector of the metal to be deposited on the second side, where the electrodeposition temperature is 0 to 70 DEG C. According to the electrode prepared by the method disclosed by the invention, the active substance in the electrode has excellent first discharge specific capacity, first coulombic efficiency and cycle performance.

The invention relates to the technical field of composite current collectors, and discloses a high-chemical-stability composite current collector base film and a preparation method thereof. The composite current collector base film is prepared from the following raw materials in parts by weight: 70 to 90 parts of PET (Polyethylene Terephthalate) resin, 10 to 20 parts of PP (Polypropylene) resin, 8 to 12 parts of modified organic silicon, 6 to 10 parts of reinforcing filler, 0.3 to 0.6 part of lubricating agent, 0.5 to 1.5 parts of antioxidant and 1.5 to 2.5 parts of compatilizer, according to the base film, PET resin serves as a main raw material, PP resin, modified organic silicon, reinforcing filler and other auxiliaries are added, the base film has excellent chemical stability under the combined action, and meanwhile the poor acid and alkali resistance of a traditional PET base film is improved.

The invention provides a current collector, a pole piece, a secondary battery, an electric device, a copper foil and a preparation method of the copper foil. The current collector comprises a copper foil, the average particle size of crystal grains in the copper foil is 50-400 nm, and based on the total number of the crystal grains in the copper foil, the number ratio of the crystal grains of the nano twin crystals is larger than or equal to 60%. Under the combined action of the high-proportion nano twin crystal structure and the small grain size, the mechanical strength of the current collector is improved while the high plasticity of the current collector is maintained, and a material basis is provided for further improvement of the energy density and the safety of the battery.

An electrode manufacturing apparatus according to one aspect of the present disclosure is configured to discharge a liquid to form a resin layer or an inorganic layer on an electrode substrate which is being conveyed in a predetermined direction. The electrode manufacturing apparatus includes a detector, a liquid discharger provided downstream of the detector in the predetermined direction and configured to discharge the liquid to form the resin layer or the inorganic layer, and a controller configured to control a discharge condition of the liquid discharger. Points where a property varies are present on the electrode substrate along a direction intersecting the predetermined direction. The detector outputs pieces of detection information obtained by detecting one of the points in time series, and the controller controls the discharge condition of the liquid discharger based on combined detection information obtained by combining the pieces of detection information.

The invention relates to a modified current collector for a cathode-free metal battery and a preparation method and application thereof.The preparation method comprises the steps that an in-situ modification reaction is conducted on the surface of a copper current collector to obtain a current collector coated with a copper oxide nanometer material, and then selenium is introduced to the surface of the current collector coated with the copper oxide nanometer material through a partial in-situ substitution reaction to obtain the modified current collector coated with the copper oxide nanometer material. The preparation method comprises the following steps: preparing a copper selenide and copper oxide composite modified current collector, performing in-situ lithiation reaction through electrochemical deposition, and partially converting to generate corresponding lithiates, thereby obtaining the modified current collector for the non-anode metal battery. According to the invention, the functional artificial interface layer with lithium affinity, high stability and high ionic conductivity is constructed on the surface of the copper-based current collector in situ, so that the key problems of uneven metal deposition and unstable SEI layer on the surface of the negative electrode current collector in the current research of the metal secondary battery without the negative electrode are solved, the formation of dendritic crystals and the occurrence of side reactions are inhibited, and the service life of the metal secondary battery is prolonged. Therefore, the coulombic efficiency, the safety and the cycle life of the battery are improved.

The invention provides an electrochemical device and an electronic device, the electrochemical device comprises a positive pole piece, the positive pole piece comprises a positive current collector, a first coating and a positive material layer, the first coating is arranged on the surface of the positive current collector, and the positive material layer is arranged on the surface, away from the positive current collector, of the first coating; the first coating comprises inorganic particles, and the inorganic particles comprise at least one of nano boehmite, aluminum oxide, titanium dioxide, magnesium oxide, zirconium oxide or zinc oxide; the positive electrode material layer comprises a first conductive agent, and the first conductive agent comprises a first carbon nanotube; the length of the first carbon nanotube is 2-5 [mu] m, and the diameter of the first carbon nanotube is 2-100 nm; and the ion transference number of the positive electrode material layer is 0.4-0.47. The electrochemical device provided by the invention can consider the nail penetrating safety performance, the low-temperature cycle performance and the quick charging performance.

The invention belongs to the technical field of batteries, and particularly relates to an electrode assembly, a preparation method thereof, a battery and a power utilization device. The electrode assembly comprises a pole piece, the pole piece comprises a current collector, an active layer and a tab, the active layer is arranged on at least one side of the current collector in the thickness direction, and the tab is arranged on one side of the current collector in the height direction; the liquid absorption capacity of the active layer is gradually reduced from one side of the current collector provided with the tab to the other opposite side of the current collector and from the current collector to the direction deviating from the current collector. According to the embodiment of the invention, the electrolyte wettability of the electrode assembly can be effectively improved by carrying out gradient / gradual change design on the liquid absorption capability of the electrode assembly in the specific direction.

The invention relates to the technical field of batteries, in particular to a preparation method and application of a functional current collector with low thermal shrinkage and high tensile strength. The functional current collector is prepared by sequentially carrying out magnetron sputtering on the thermal shrinkage transition layer and the copper layer on the surface of the base film and then carrying out water plating on the copper layer. The functional current collector prepared by the invention can effectively solve the problems of relatively large thermal deformation and relatively large residual stress of the functional current collector, and also can improve the overall strength and stability of the functional current collector, so that the functional current collector has a wide application prospect in the technical field of batteries.

The invention discloses a negative pole piece and a preparation method thereof, a bipolar pole piece and a preparation method thereof, a battery and an electric device. The negative pole piece comprises a first current collector and a second current collector, wherein the first current collector comprises a first side and a second side which are opposite to each other; the first active material layer and the second active material layer are sequentially arranged on the first side in the direction away from the first current collector, the first active material layer comprises metal lithium, and the second active material layer comprises metal lithium alloy. By adopting the negative pole piece or the bipolar pole piece, the problems of continuous thickening of an SEI film, continuous growth of lithium dendrites, lithium death, penetration of the lithium dendrites to a diaphragm and the like can be avoided, so that the cycle stability of a battery applying the negative pole piece or the bipolar pole piece is favorably improved.

The invention discloses a composite current collector, a preparation method thereof, an electrode plate containing the composite current collector, and a secondary battery. The composite current collector sequentially comprises a first conducting layer, a first bonding layer, an insulating layer, a second bonding layer and a second conducting layer, and the first conducting layer and the second conducting layer are both copper layers; binders of the first bonding layer and the second bonding layer are respectively and independently selected from any one of epoxy resin, polyolefin, polyester and polyurethane. The composite current collector prepared by the invention has good structural stability, has low requirements on an insulating layer, is high in safety when being applied to a battery, and is beneficial to improving the energy density of the battery.

A rectangular secondary battery is provided with: a rectangular exterior body having an opening, a bottom part, a first lateral wall, a second lateral wall, a third lateral wall, and a fourth lateral wall; a sealing plate for sealing the opening; and a flat wound electrode body obtained by winding a positive electrode plate and a negative electrode plate with a separator therebetween, wherein a plurality of the flat wound electrode bodies are arranged in the rectangular exterior body. The flat wound electrode bodies each have: a flat region formed at the center, a first bent region having a bent outer surface and being formed on one end side of the flat region; and a second bent region having a bent outer surface and being formed on the other end side of the flat region.

The utility model provides a roll core and a battery. The roll core comprises a positive plate, a negative plate and a diaphragm, and the positive plate and the negative plate are wound along the winding direction across the diaphragm. The positive plate comprises a current collector, an active material layer and an adhesive tape, at least one surface of the current collector is provided with a layout area and an empty foil area which are arranged along the length direction of the positive plate, and the empty foil area is closer to the ending end of the positive plate than the layout area. The active material layer is arranged in the laying area and is provided with an ending edge. The ending edge of the active material layer defines a boundary between the routing region and the empty foil region. The tape covers the ending edge, includes a base layer and an adhesive layer, and has a head end and a tail end extending in the winding direction. And the ending end of the negative plate exceeds the head end of the adhesive tape along the winding direction. The surface, facing the current collector, of the base layer is provided with a glue area and a non-glue area, and the glue layer is arranged in the glue area. The adhesive layer at least partially covers the empty foil area, and a small part of the non-adhesive area covers the active material layer. This construction contributes to the reduction of security risks.

The invention provides an elastic current collector and a preparation method and application thereof. The elastic current collector comprises a metal foil and an elastic carbon interface layer arranged on at least one side surface of the metal foil, and the elastic carbon interface layer comprises an elastic carbon material, a conductive additive and a binder; the elastic carbon material comprises hollow carbon and / or biomass-based porous carbon, and the surface and the interior of the biomass-based porous carbon are both provided with pore structures. According to the invention, hollow carbon and / or biomass-based porous carbon are / is used as an elastic carbon material, mixed with the conductive additive and the binder, and then coated on the surface of at least one side of the metal foil to form the elastic carbon interface layer, so that the surface roughness of the current collector is increased and the interface stress is dynamically reduced without influencing the electrochemical performance of the electrode; therefore, the electrochemical stability of the electrode is effectively improved, and the preparation method is simple and suitable for large-scale application.

A composite current collector for an anode-free lithium metal battery and a preparation method therefor, and an anode-free lithium metal battery. The composite current collector for an anode-free lithium metal battery comprises: a base film; an electrically conductive layer, which is arranged on at least one side surface of the base film; and a surface modification layer, which is arranged on the side surface of the conductive layer that is away from the base film, wherein the material of the surface modification layer comprises a hydroxyapatite-based compound. By means of constructing, on the surface of a composite current collector, a surface modification layer including a hydroxyapatite-based composite, the repulsion of an anode to free-state anions is effectively relieved, such that sufficient anion derivatives are generated at an electrolyte-anode interface to stabilize the electrolyte-anode interface; and the generated stable interface can reduce desolvation energy barriers of lithium ions, accelerate the transmission dynamics of the interface, and effectively suppress the generation of "dead lithium" and lithium dendrites, thereby prolonging the cycle life of a lithium metal battery.

The invention discloses a negative electrode current collector and a preparation method thereof, a battery monomer, a battery and a power utilization device, and the preparation method of the negative electrode current collector comprises the following steps: providing a metal matrix which is of a two-dimensional metal structure or a three-dimensional porous metal structure; and irradiating at least part of the surface of the metal matrix by adopting laser to melt and recrystallize metal grains in a laser ablation heat affected zone of the metal matrix to form metal grains with smaller sizes, thereby obtaining the negative electrode current collector. The reliability and the cycle performance of the battery can be improved.

The invention provides a composite current collector, a pole piece, a secondary battery and an electric device. The composite current collector comprises a base material layer, a first filler, a bonding layer and a conductive layer, the bonding layer is located between the base material layer and the conductive layer, one end of the first filler is embedded into the base material layer, the other end of the first filler is embedded into the bonding layer, the hardness of the first filler is larger than that of the base material layer, and the hardness of the first filler is larger than that of the bonding layer. According to the composite current collector, the first filler with the hardness larger than that of the base material layer and the bonding layer is introduced, one end of the first filler is embedded into the base material layer, the other end of the first filler is embedded into the bonding layer, the first filler can serve as an acting point between the base material layer and the bonding layer, and the elastic modulus of the composite current collector can be improved; and the risk of wrinkling in the pole piece processing process is reduced.

The invention relates to the technical field of battery current collectors, in particular to a high-strength composite current collector and a preparation method thereof.The preparation method of the composite aluminum foil current collector comprises the following steps that S1, a base material roll film is modified on a film stretching line so as to improve the tensile strength and reduce the ductility; the base material roll film is a polymer base material roll film for preparing the composite current collector; s2, copper plating or aluminum plating is conducted on the surface of the modified base material roll film; and S3, forming the high-strength composite current collector coiled material. Through base material modification, compared with a composite current collector in the prior art, the composite current collector is higher in strength and lower in total elongation under low elongation, the problem that the compactness of a metal layer becomes poor under high elongation is effectively solved, the modified composite current collector is not prone to being excessively stretched during subsequent procedure operation, and if the modified composite current collector is excessively stretched, the modified composite current collector can be directly fractured, so that the service life of the composite current collector is prolonged. The problem that the compactness of the metal layer is poor but not easy to find due to excessive stretching and non-fracture is solved, and the operation difficulty of procedures such as downstream coating is reduced.

The invention provides a composite current collector of an adjustable resistor. The composite current collector comprises a macromolecule layer, metal layers attached to the two sides of the macromolecule layer and functional layers attached to the surfaces of the metal layers. The macromolecule layer can be made of various organic matter membrane materials, and the metal layers are uniformly distributed on the two sides of the macromolecule layer; the functional layer uniformly covers the metal layer and has the capability of conducting electrons, and meanwhile, the resistance of the functional layer is changed along with the change of states such as temperature and voltage of the functional layer. The thickness of the composite current collector is 1-40 [mu] m, the functional layer, the metal layer and the polymer film layer are tightly combined, the composite current collector is resistant to electrochemical corrosion and not prone to falling off, the composite current collector has the advantages of being light, thin, high in strength and good in toughness, and the metal current collector film can be effectively improved to provide an electronic path for short circuit in a battery when the battery is subjected to thermal runaway; and the safety problem of heat release of the battery is aggravated.

Provided in the present application are a battery cell and a preparation method therefor, and a battery device and an electric device. The battery cell comprises a negative electrode sheet, the negative electrode sheet comprising a first layer and a non-metallic layer located on the surface on at least one side of the first layer, wherein the nucleation overpotential of Li on the non-metallic layer is V1, and the nucleation overpotential of Li on the first layer is V2, and V1>V2. The negative electrode sheet in the present application can induce the deposition of lithium metal on the surface of a first layer, mitigate dendrite growth and improve the uniformity of lithium metal deposition, thereby improving the cycling performance of battery cells.

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 present application relates to the technical field of batteries, and discloses a thermal management component and a battery pack. The thermal management component has a first direction, a second direction and a third direction which intersect in pairs, the thermal management component comprises a heat exchanger and a current collector, and the current collector is connected to at least one end of the heat exchanger in the first direction; the maximum length of the current collector in the first direction is a first length, the maximum length in the third direction is a third length, and the first length is less than the third length; the current collector is provided with a first flow channel running through the current collector in the third direction, a medium flow channel is provided in the heat exchanger, and the medium flow channel is communicated with the first flow channel.

The invention belongs to the technical field of batteries, and discloses a negative pole piece, a preparation method thereof and a lithium battery. The negative pole piece comprises a current collector and a lithium-loving active layer, the lithium-loving active layer is arranged on at least one side of the current collector, the lithium-loving active layer comprises a lithium-loving active site, and a functional group is grafted on the lithium-loving active site. The functional group comprises at least one of a silicon-containing functional group, a nitrogen-containing functional group, a sulfur-containing functional group and a boron-containing functional group. According to the negative pole piece provided by the invention, the rate capability, the cycling stability and the safety performance of the lithium battery can be improved.

The invention relates to the technical field of batteries, in particular to a copper foil and a preparation method thereof, a current collector, a pole piece and an energy storage device. A connection degree gamma exists between the surface density of the copper foil and the size and arrangement of the through holes, the formula of the connection degree gamma is # imgabs0 #, and the value range of gamma is 1 + / -0.1; the copper foil is prepared through an electrolytic method, and an insulating acid-resistant coating is dispensed on the surface of a cathode of the electrolytic method to form an insulating acid-resistant layer; according to the electrolytic method, an active layer is formed on the surface of an anode by coating a mixed active substance solution and sintering, an inert substance is coated on the surface of the active layer opposite to a point coating position of a cathode to form an inert layer, and the range of the inert layer is smaller than 70% of the area of a pore region. The porous copper foil prepared by the method has a porous structure, the pore size distribution is more uniform, the size is consistent, meanwhile, the parts except the pores are dense copper layers, and the mechanical property of the material is good.