29results about How to "Avoid Lithium" patented technology

The invention relates to the technical field of batteries, in particular to a lithium ion secondary battery. The lithium ion secondary battery comprises a negative plate and a positive plate, the negative plate comprises a negative active material layer, and the negative active material layer comprises a first negative active material layer deviating from the negative current collector and a second negative active material layer close to the negative current collector which are laminated in the thickness direction of the negative plate; the liquid absorption coefficient Y of the negative plate and the vertical distance X from any point in the negative electrode active material layer to the surface of the negative electrode current collector meet the following formula: Y = eX + M-N, the liquid absorption coefficient Y is the ratio of the surface porosity of the section of the negative electrode active material layer which is parallel to the surface of the negative electrode current collector and has the vertical distance X to the average particle size of the negative electrode active material on the section, e is a natural constant, and M is a natural constant. M is 4 to 10, and N is 50 to 4000; at least one side surface of the positive plate is provided with a convex part. The lithium ion secondary battery disclosed by the invention can take both high energy density and relatively good fast charging performance into account.

The utility model discloses a pole piece which comprises a current collector, an active material layer and an electrolyte expansion layer, the surface of at least one side of the current collector is coated with the active substance layer, the active substance layer is wound along with the current collector, the pole piece comprises a corner area which forms a corner during winding, and the electrolyte expansion layer is arranged on the surface of the active substance layer and located in the corner area. According to the technical scheme, the electrolyte expansion layer is arranged in the corner area of the pole piece, so that the lithium precipitation phenomenon in the corner area can be effectively improved. And the electrolyte expansion layer expands after being infiltrated by the electrolyte, and can be supported between adjacent pole pieces to form a gap. The electrolyte expansion layer is arranged in the corner area of the wound pole piece to support the gap for the electrolyte to flow, so that the phenomenon that the electrolyte is extruded out of the gap due to the expansion of the pole piece in the circulating process is avoided, the lithium separation in the corner area is effectively prevented, and the circulating stability and the service life of the battery core assembly are improved. In addition, the utility model further discloses a battery cell assembly.

The invention discloses a negative pole piece and a lithium ion battery, belongs to the technical field of lithium ion batteries, and overcomes the defects that the rate capability of the lithium ion battery in the prior art is relatively low, and lithium is easy to separate out in a circulating process. The negative electrode active material comprises a first negative electrode active material and a second negative electrode active material, the negative electrode active material satisfies the following conditions: A-B = 0.01-0.75 g / cm < 3 >; a is the ultimate compaction density of the first negative electrode active material, and B is the ultimate compaction density of the second negative electrode active material; in the negative electrode active material layer, the negative electrode active material layer comprises n coating layers along the direction far away from the current collector, n is more than or equal to 3 and less than or equal to 10, and n is an integer; along the direction far away from the current collector, the content of the first negative electrode active material in the n coating layers is gradually reduced, and the content of the second negative electrode active material is gradually increased. The problem of local black spots or lithium precipitation of the anode interface can be avoided, and meanwhile the cycling stability is improved.

The invention discloses a preparation method of a pole piece for improving lithium precipitation at an arc position of a winding type battery cell and the battery cell, and relates to the technical field of winding type lithium ion batteries, the preparation method of the pole piece comprises the following steps: setting a rolling program according to a selected winding battery cell model, and setting the rolling pressure of an arc area to be smaller than that of a non-arc area; and rolling the current collector coiled material coated with the active substance according to a rolling procedure, and cutting to obtain the pole piece. According to the method, the roller pressure at the arc is reduced, so that the arc is thicker and lower in compaction, and the positive and negative plates are thicker and lower in compaction at the arc, so that under the action of the winding force, the fitting degree between the positive and negative electrodes of the winding type arc and the diaphragm is obviously improved. And at the corner and the position with relatively small compaction density of the pole piece, the migration kinetics of lithium ions is guaranteed, and lithium separation can be avoided under high magnification.

The invention discloses a battery and a battery manufacturing method, and the battery comprises a housing which is provided with a storage cavity; the battery cell is arranged in the storage cavity, the battery cell comprises a straight part and a bent part, two ends of the bent part are respectively connected to the two straight parts, a groove is formed in the bent part, and the groove is used for accommodating electrolyte. The battery cell comprises the straight part and the bent part, the bent part is formed after the pole piece is bent, the bent part is provided with the groove for accommodating the electrolyte, in the prior art, the bent part of the battery cell is not provided with the groove, so that more electrolyte cannot be accommodated, and the problem of lithium precipitation of the battery is caused; and even if the bent part is extruded, the electrolyte can be effectively stored in the groove, so that the problem of lithium precipitation of the battery can be effectively avoided. Specifically, the battery can effectively avoid lithium precipitation.

The utility model relates to a cylindrical battery insulation spacer which comprises a spacer base material made of non-woven fabric; the gasket coating is formed on at least one surface of the gasket base material, and the gasket coating is made of ceramic, boehmite or glass fiber reinforced PPS (Polyphenylene Sulfide). Therefore, the hardness and the supporting force of the gasket can be enhanced, and the gasket has good mechanical strength and is not prone to deformation at high temperature. Meanwhile, the gasket can have good liquid retention property, and when the battery is subjected to high-current discharge, the electrolyte remained in the composite gasket can release electrolyte to the current collector, so that the problem of lithium precipitation of the current collector is avoided; and the electrolyte permeability of the insulating spacer is higher than that of a conventional insulating spacer.

The utility model discloses a battery case and battery, the battery case is used for accommodating a laminated cell, two opposite outermost layers of the laminated cell are both single-sided pole pieces, the battery case comprises a first half shell and a second half shell which are in butt joint with each other, the first half shell and the second half shell are in butt joint to form an accommodating cavity for accommodating the laminated cell, and the first half shell and the second half shell are in butt joint with each other. Each of the first half shell and the second half shell comprises a side wall opposite to the single-sided pole piece, and at least one side wall is provided with a pressing part for pressing the side edge of the single-sided pole piece. According to the battery shell disclosed by the utility model, the side edge of the single-sided pole piece is correspondingly pressed through the pressing part arranged on the side wall of the first half shell and / or the side wall of the second half shell so as to tightly bind the laminated battery cell, so that the single-sided pole piece of the laminated battery cell can be kept in a flat state, and the periphery of the single-sided pole piece is tightly attached; therefore, lithium precipitation caused by warping of the single-sided pole piece in the later cycle process is prevented, and the cycle performance of the battery cell is improved.

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to an anode current collector which comprises a polymer layer, and at least one side of the polymer layer along the thickness direction of the anode current collector is provided with a first metal layer and a second metal layer; in the Y-axis direction, the first metal layer and the second metal layers are arranged in parallel, the second metal layers are arranged on the two sides of the first metal layer and located on the edge of the macromolecule layer, and the electric conductivity sigma1 of the first metal layer and the electric conductivity sigma2 of the second metal layers meet the relational expression that sigma2 is smaller than sigma1. According to the utility model, the second metal layer with smaller conductivity is arranged at the edge, so that the problem of lithium ion accumulation at the edge is solved, and the problem of lithium precipitation at the edge is relieved. In addition, the utility model also discloses a positive pole piece comprising the positive current collector, a battery and an electric device.

The invention relates to the technical field of batteries, in particular to a battery charging current calculation method and device, a medium and a battery management system. The method mainly comprises the steps of obtaining battery basic information and battery charging information; substituting the battery basic information and the charging information into a function that the battery temperature changes along with the charging current, and calculating the charging current; correcting the charging current based on the battery aging state SOH; and feeding back a closed-loop control charging current according to the temperature deviation. According to the invention, the feedforward charging current calculated based on the battery thermal model and the aging state can adapt to different environment temperatures and the aging state of the battery; by setting different charging target cut-off SOC values and target boundary temperature limit values and combining the deviation between the battery temperature and the target temperature limit value, the charging current and temperature rise of the battery can be controlled, so that the aging speed of the battery is controlled, and over-temperature charging or lithium precipitation is avoided.

The utility model discloses a battery, a battery device and electric equipment, the battery comprises a battery cell, the battery cell comprises a pole piece, and the pole piece comprises a dressing part and an empty foil part; and the temperature sensing piece is arranged at the empty foil part. According to the battery, the battery device and the electric equipment, the temperature of the battery cell can be accurately measured, and the capacity and the service life of the battery cell are not influenced.

The present application provides an electrochemical device and an electronic device. In some embodiments of the present application, an electrochemical device is provided, which includes: a positive electrode, including a positive electrode current collector and a positive electrode active material layer located on the positive electrode current collector; a negative electrode, including a negative electrode current collector and a negative electrode active material layer located on the negative electrode current collector, the negative electrode active material layer includes: an edge region and a main region in a first direction, the edge region is located on one side or both sides of the main region, the first direction is parallel to the width direction of the negative electrode current collector; the capacity per unit area of ​​the edge region to the capacity per unit area of ​​the positive electrode active material layer is CB 1 , 1.05≤CB 1 ≤1.25. This application can improve safety performance and prevent deformation.

The utility model discloses a laminated battery cell and a battery, the laminated battery cell comprises a battery cell body, and two opposite side surfaces of the battery cell body are respectively provided with a single-sided pole piece; and the two supporting sheets are respectively positioned on two opposite sides of the battery cell body, and each supporting sheet is correspondingly attached to one single-sided pole piece. According to the laminated battery cell disclosed by the utility model, under the supporting action of the supporting sheets, the single-sided pole pieces of the battery cell body can be kept in a flat state, and the peripheries of the single-sided pole pieces are tightly attached, so that lithium precipitation caused by warping of the single-sided pole pieces in a later cycle process is prevented, and the cycle performance of the battery cell is improved.

The invention provides a lithium ion solid-state battery electrode material and a preparation method thereof, and the preparation method comprises the following steps: adding a nitrogen source and a carboxyl auxiliary ligand into a metal salt solution, and carrying out a heat sealing reaction to obtain a coordination metal cluster; mixing the cellulose derivative and the functional organic group, and carrying out polymerization reaction to obtain a copolymer matrix; dissolving the coordination metal cluster and the copolymer matrix in a lithium salt solution, and carrying out a cross-linking reaction to obtain a composite solution; and adding an electrode active material into the composite solution, uniformly stirring, defoaming, coating on a current collector, and drying to obtain the lithium ion solid-state battery electrode material. Therefore, the cycle life and conductive efficiency of the battery are improved.

This invention relates to a low-temperature charging method for lithium-ion batteries. The method includes acquiring constant-capacity data of the battery measured at room temperature, where n1, n2, and n3 represent the charging capacities corresponding to 25–35% SOC, 45–55% SOC, and 75–85% SOC, respectively, and aV, bV, and cV represent the corresponding voltages; preparing for charging at low temperature; charging to aV at a first-rate constant current, recording the capacity m1; determining whether the condition n1 / m1 ≥ 65% is met; if not, maintaining a constant voltage to 0.08–0.12C; if the condition is met, charging to bV at a second-rate constant current, recording the capacity m2; determining whether n2 / m2 ≥ 65% is met; if not, maintaining a constant voltage to 0.03–0.07C; if the condition is met, charging to cV at a rate of 0.33C, recording the capacity m3; determining whether n3 / m3 ≥ 65% is met; if not, maintaining a constant voltage to 0.08–0.12C; if the condition is met, charging at a third-rate constant current. This invention can improve charging capacity and charging efficiency, and improve or prevent lithium plating.

The invention belongs to the technical field of batteries, and particularly relates to a lithium ion battery. Compared with the prior art, the rapid charging and high-temperature storage performance of the lithium iron phosphate battery is improved by comprehensively controlling the design of the positive and negative pole pieces and the electrolyte. On one hand, by adjusting the particle size distribution of the lithium iron phosphate material particles, the lithium ion transmission path is more uniform, the lithium ion transmission rate consistency is improved, and the overall fast charging performance of the battery is improved; and on the other hand, the carboxylic ester solvent with lower viscosity is adopted, the viscosity of the electrolyte is obviously reduced, the liquid-phase lithium ion transmission capability is greatly improved, and meanwhile, a positive electrode material is matched, so that the comprehensive fast charging performance of the battery is improved. And finally, by selecting a chain binder and compounding a proper amount of unsaturated carbonic ester, the protection of the negative electrode active material is realized, and the side reaction of the electrolyte and the negative electrode side is obviously reduced.

The present invention belongs to the technical field of secondary battery materials. More specifically, it relates to a high-voltage fast-charging lithium-ion battery and electrolyte. The products provided by the present invention include a base solvent, a lithium salt, a functional additive, a polymer electrolyte, and a nano-inorganic filler; wherein the base solvent is dispersed in the polymer electrolyte to form a gel polymer electrolyte; the lithium salt, the functional additive, and the nano-inorganic filler are dispersed in the gel polymer electrolyte; the polymer electrolyte is selected from polyethylene oxide; the nano-inorganic filler is compounded by boehmite and alumina in a mass ratio of 8:1-10:1. The base solvent is prepared from the following raw materials in parts by weight: 50-60 parts of ethylene carbonate, 10-15 parts of fluorinated ethylene carbonate, 8-10 parts of acrylonitrile, and 3-5 parts of methyl ethylene oxide; the functional additives include film-forming protection additive vinyl sulfate, overcharge protection additive DTD, and flame retardant additive trimethyl phosphate.

The utility model belongs to the technical field of batteries, and particularly relates to a battery cell, a battery and electric equipment, the battery cell comprises a first pole piece, a second pole piece and a diaphragm arranged between the first pole piece and the second pole piece, along the winding direction of the battery cell, the first pole piece comprises a plurality of first straight parts and first bent parts which are alternately arranged, and the second pole piece comprises a plurality of second straight parts and a plurality of second bent parts which are alternately arranged; the first pole piece comprises a plurality of first straight parts and a plurality of second bent parts which are alternately arranged, the second pole piece comprises a plurality of second straight parts and a plurality of second bent parts which are alternately arranged, insulating parts are arranged on the first bent parts and / or the second bent parts, the orientations of the first straight parts and the second straight parts are opposite in the innermost ring of the battery cell, and the orientations of the first straight parts and the second straight parts are opposite in the thickness direction of the battery cell. The first straight parts and the second straight parts are alternately arranged; after the battery cell is wound, the first straight parts and the second straight parts can be arranged in a one-to-one correspondence manner, and the first bent parts and the second bent parts can be arranged in a one-to-one correspondence manner, so that the thickness of the battery cell is reduced, and the waste of raw materials is reduced.

This application provides a battery, a battery pack, and an electrical device. The battery of this application includes a cell pack and a buffer assembly. The buffer assembly is sandwiched between two adjacent cell packs. The cell pack includes a buffer section and a liquid storage section. The liquid storage section can break and release electrolyte when the cell pack reaches its expansion limit. On the one hand, it can provide a certain expansion space for cell expansion, and on the other hand, it can replenish electrolyte, avoid lithium plating due to insufficient electrolyte, and improve battery safety.

The utility model discloses a single-sided pole piece, a laminated cell and a battery, the single-sided pole piece is applied to the laminated cell, the laminated cell comprises a pole piece group and a diaphragm, the pole piece group is formed by laminating double-sided pole pieces, the single-sided pole piece is positioned on the outermost side of the pole piece group, the diaphragm is arranged between the single-sided pole piece and the pole piece group, the single-sided pole piece comprises a current collector, a current collector, a current collector and a current collector, the active material layer is arranged on one surface of the current collector; and the bonding layer is arranged on one surface, facing the diaphragm, of the active material layer, and the bonding layer comprises a first bonding strip arranged along the periphery of the active material layer. The single-sided pole piece disclosed by the utility model can be bonded with a diaphragm in the laminated battery cell through the bonding layer, particularly the first bonding strips arranged along the periphery of the active material layer in the bonding layer, so that the periphery of the single-sided pole piece is tightly attached in the laminated battery cell, the flatness is improved, lithium precipitation caused by warping in a later cycle process is prevented, and the service life of the single-sided pole piece is prolonged. And the cycle performance of the battery cell is improved.

The invention discloses an extrusion coating composite gasket structure and an extrusion coating machine, and relates to the technical field of pole piece coating, the extrusion coating composite gasket structure comprises a main gasket and a forced cutting gasket, the main gasket comprises a transverse piece and two extension side pieces connected to the two sides of the transverse piece, and the transverse piece and the two extension side pieces define a hollow main slurry channel; a main slurry outlet is formed in the main slurry channel in the material coating direction; the forced cutting gasket comprises a connecting head part, a forced cutting part and a flow blocking part connected between the connecting head part and the forced cutting part, the connecting head part is arranged in the middle of the transverse piece, the flow blocking part is located in the main slurry channel, and the forced cutting part is located at the main slurry outlet; the thickness of the forced cutting part is smaller than that of the connecting head part and the flow blocking part; through the composite structure of the main body gasket and the forced cutting gasket, the amount of slurry in the middle during positive electrode coating is reduced, and the problem of lithium precipitation during positive electrode coating is solved; the forced cutting gasket can move back and forth within a certain range, and adjustment of the cutting width and thickness in a main slurry channel and an outlet is achieved.

The utility model discloses a battery cell and a battery, the battery cell comprises a positive plate, a negative plate and a first protection piece, and the battery cell is formed by winding the positive plate and the negative plate after the positive plate and the negative plate are laminated; the negative plate comprises a first section, a second section and a third section, two ends of the second section are respectively connected to the first section and the third section, two sides of the first section are not provided with negative active material layers, one side of the second section is provided with a negative active material layer, and two sides of the third section are provided with negative active material layers; one end of the first section away from the second section is a winding starting point of the negative plate, and one end of the third section away from the second section is a winding ending point of the negative plate; the first protection piece is connected to the corner area of the second section and covers the end, away from the second section, of the first section. Wherein the first protection piece comprises an elastic layer, and the elastic layer has elasticity. The battery cell provided by the utility model can effectively avoid lithium precipitation.

In order to improve the lithium precipitation problem of a pole piece, the invention provides a battery cell and a battery, the battery cell comprises a positive plate and a negative plate, the positive plate comprises a positive current collector, a positive tab and a positive active material layer, the positive active material layer is arranged on at least one side of the positive current collector, and the positive tab is connected with the positive current collector; the negative plate comprises a negative current collector, a negative tab and a negative active material layer, the negative active material layer is arranged on at least one side of the negative current collector, and the negative tab is connected with the negative current collector; in the length direction of the negative plate, the coating surface density of the negative active material layer is gradually increased along the direction far away from the negative tab; and in any region of the battery cell, the ratio K of the coating surface density of the negative electrode active material layer to the coating surface density of the positive electrode active material layer at the corresponding position is more than or equal to 0.4 and less than or equal to 0.52.

The embodiments of the present application disclose an isolation membrane for an electrode assembly, a method and an apparatus for preparing the isolation membrane for an electrode assembly. The first surface of the isolation membrane includes a first circulation area and a first barrier area. The first barrier area is formed by spraying or scraping an insulating material on the edge areas on both sides along a first direction on the first surface. The first direction is perpendicular to the extension direction of the isolation membrane. The first circulation area is the area on the first surface except the first barrier area. The first circulation area is used to pass ions in the electrolyte, and the first barrier area is used to block ions in the electrolyte. The isolation membrane for an electrode assembly, the method and the apparatus for preparing the isolation membrane for an electrode assembly according to the embodiments of the present application can improve the performance of the isolation membrane, thereby improving the performance of the electrode assembly in the battery cell.

The utility model provides a battery cell and belongs to the technical field of battery structures. The battery cell comprises a lamination body and a reference electrode, the lamination body is formed by stacking positive pole pieces and negative pole pieces in a staggered manner, and the pole pieces at the top and / or the bottom of the lamination body are the positive pole pieces; and the reference electrode is arranged on the outer surface of the positive pole piece on the outermost side of the lamination body. By setting the pole piece at the top and / or the bottom of the lamination body as the positive pole piece and arranging the reference electrode on the outer surface of the positive pole piece, the capacity loss caused by the loss of lithium ions contained in the positive pole piece in the middle area of the lamination body by the reference electrode in the use process can be avoided, namely, the capacity loss is reduced. The battery cell provided by the utility model can stably monitor the potential change of the anode and the cathode in the charge-discharge cycle process of the lithium battery, and the capacity loss rate of the cathode is prevented from being higher than that of the anode, so that lithium precipitation and other safety problems can be avoided.

The utility model discloses a laminated cell and a battery, the laminated cell is provided with an uppermost pole piece, a middle pole piece group and a lowermost pole piece which are sequentially laminated along the lamination direction, and the laminated cell comprises a main body part and a first tab part connected to the first side of the main body part; the main body part is provided with a first thinned area on the first side, a surface perpendicular to the stacking direction is a projection surface, and the projection of the first thinned area on the projection surface forms a first thinned area; the main body part is provided with a first coating on one surface, far away from the middle pole piece group, of the uppermost pole piece and / or the lowermost pole piece, the projection of the first coating on the projection surface forms a thickened area, and the thickened area is located in the first thinned area. The utility model is applied to the field of secondary batteries.

The invention discloses a battery, comprising: a housing having a storage cavity; the battery cell is arranged in the storage cavity, the battery cell comprises a negative plate, a groove is formed in the negative plate, and the volume of the groove is V; the electrolyte is arranged in the storage cavity, and the viscosity value of the electrolyte is omega; wherein the volume of the groove and the viscosity value of the electrolyte meet the following formula: phi = omega / V, phi is the viscosity value of the electrolyte under the unit volume of the groove, and the value range of phi is that phi is more than or equal to 4.69 mPas / mm < 3 > and less than or equal to 240 mPas / mm < 3 >; the compaction density of the negative plate is P, the depth of the groove is H, and P and H meet the condition that P * H / omega is larger than or equal to 4.44 and smaller than or equal to 56.67. The battery provided by the invention not only can effectively avoid the problem of lithium precipitation, but also can have the characteristic of relatively high conductivity.

The utility model belongs to the technical field of batteries, and particularly relates to a negative plate and a battery, the negative plate comprises a negative plate body, the negative plate body comprises a plurality of straight areas and a plurality of bent areas along the winding direction of the negative plate body, the plurality of straight areas and the plurality of bent areas are alternately arranged in sequence, and the plurality of straight areas and the plurality of bent areas are arranged in the winding direction of the negative plate body. A light curing adhesive layer is arranged on at least one bending area; under the negative pressure condition, the light curing adhesive layer can infiltrate the bending area of the negative plate body, and after the light curing adhesive layer is cured, the coating of the bending area of the negative plate body effectively has better cohesive force, adhesive force and toughness, and in the subsequent hot-pressing and charging circulation process, the bending area of the negative plate body is not damaged. The coating of the bending area of the negative plate body has better bending resistance, so that the conditions of coating stripping, fragmentation and powder falling caused by stress change of the bending area of the negative plate body are avoided, lithium precipitation at the corner position of a battery cell is avoided, the performance of the battery is further improved, and the service life of the battery is prolonged.

This invention discloses a composite separator, its preparation method, and its applications, belonging to the field of new energy materials technology. The composite separator provided by this invention includes a substrate layer and a composite coating disposed on at least one surface of the substrate layer; the composite coating includes a two-dimensional amorphous nanoscale filler, comprising a first filler, a second filler, and a third filler; the first filler is boron nitride; the second and third fillers are independently selected from at least one of MoS2, WS2, V2O5, MoSe2, MXene, graphene, and TiS2; and the second and third fillers are different. The composite separator provided by this invention exhibits excellent electrolyte wettability, puncture resistance, heat shrinkage resistance, and mechanical strength. This invention also provides a preparation method and applications of the above-mentioned composite separator.

The present invention relates to a lithium-containing material. The lithium-containing material is white powder. The lithium-containing material contains components of lithium (Li),aluminum(Al),phosphorus(P),fluorine(F)and oxygen(O)elements. The contents of the elements in mass ratio are as follows: the content of the lithium element is greater than 0% and less than or equal to 12%, the content of the aluminum element is 5%-40%,the content of the phosphorus element is 1%-35%,the content of the fluorine element is 0.4%-22%, and the content of the oxygen element is 2%-34%.The lithium-containing mate-rial is used as an electrode additive material or diaphragm coating material of a lithium-ion battery.