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55results about How to "Avoid Lithium" patented technology
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Method for supplementing lithium for negative electrode of lithium ion battery
ActiveCN102916165AAvoid LithiumAvoid deformationElectrode manufacturing processesElectrolyte/reactants regenerationMetallic lithiumElectrical battery
The invention belongs to the technical field of lithium ion batteries, in particular to a method for supplementing lithium for a negative electrode of a lithium ion battery. The method comprises the following steps: spraying or dripping an organic lithium solution on a surface of a negative electrode in an inert atmosphere, so that lithium ions in the organic lithium solution are reverted to metal lithium which is embedded into the negative electrode; and drying the negative electrode. Compared with the prior art, in the method, the organic lithium solution is sprayed or dipped on the surface of the negative electrode evenly so as to realize lithium supplementation in a wet process, thereby effectively avoiding metallic lithium powders floating in the air in a dry process to ensure safe production; and the whole process is simple, the cost is lower, the amount of the lithium supplementation can be controlled accurately through the amount and the time by spraying or dripping the organic lithium solution so as to supplement the lithium evenly, thereby preventing lithium precipitation and deformation of the negative electrode and improving the initial efficiency of the battery. Therefore, the the energy density of the battery is improved. Additionally, the invention further discloses another method for supplementing the lithium for the negative electrode of the lithium ion battery.
Owner:DONGGUAN AMPEREX TECH +1
Lithium-ion battery rapid charging method capable of preventing lithium separation
ActiveCN106099230ASafe Fast Charging MethodsFast fast charging methodSecondary cells charging/dischargingCharge currentCharged current
The invention discloses a lithium-ion battery rapid charging method capable of preventing lithium separation. The lithium-ion battery rapid charging method comprises the following steps: obtaining a lithium separation boundary when a lithium-ion battery is charged; according to the lithium separation boundary, setting a charging current rule of the lithium-ion battery; in the charging current rule, controlling charging current so that lithium separation of the lithium-ion battery does not occur; and charging the lithium-ion battery according to the charging current rule. The lithium-ion battery rapid charging method capable of preventing the lithium separation has the advantages that the charging current rule of the lithium-ion battery is set according to the lithium separation boundary when the lithium-ion battery is charged, safe and rapid charging is realized and the cycle life of the battery is not influenced.
Owner:TSINGHUA UNIV
High-power flexible packaged lithium ion battery and processing process thereof
InactiveCN104157914ALower internal resistanceHigh power energy densityFinal product manufactureSecondary cellsInternal resistanceElectrical battery
The invention relates to a high-power flexible packaged lithium ion battery and a processing process thereof. An individual battery cell comprises a negative plate, a positive plate, a first membrane and a second membrane, wherein the first membrane, the negative plate, the second membrane and the positive plate are stacked in sequence; the positive plate is arranged in an innermost layer and formed by winding. According to the lithium ion battery, a first positive island region and a second positive island region which are not coated with active substances are arranged in a certain distance on the two sides of a positive tab; during winding, the second positive island region and the first positive island region are used for correspondingly wrapping a negative tab and the rear surface of the negative tab respectively, so that the lithium separation when the positive active substances are over against the negative tab is avoided. According to the preparation method, the battery is hotly and coldly pressed before formation, and excess electrolyte in the battery is squeezed into an airbag, so that the hardness of the battery is improved, the layers of membranes, the positive plate and the negative plate are in relatively close contact with each other, the interface impedance and the internal resistance of the battery are reduced, and the power energy density of the lithium ion battery is increased.
Owner:SHANDONG QIXING NEW ENERGY SCI & TECH CO LTD
High voltage electrolyte considering high and low temperature performance and lithium ion battery using the electrolyte
InactiveCN105576283AImprove wettabilityImprove cycle performanceSecondary cellsElectrolytesElectrolytic agentCarboxylic acid
The invention discloses high voltage electrolyte considering high and low temperature performance and a lithium ion battery using the electrolyte. The high voltage electrolyte comprises a non-aqueous organic solvent, an electrolyte lithium salt, an ether nitrile compound and a low impedance additive, wherein the non-aqueous organic solvent comprises a carbonate solvent and a linear carboxylic acid ester solvent with a wide liquid range; the electrolyte lithium salt is a combination of lithium hexafluorophate and lithium triflurosulfimide according to a molar ratio of 0.01-0.5; and the low impedance additive is a cyclic sulfate compound. The linear carboxylic acid ester solvent for perfecting the electrode / electrolyte interface is contained in the high voltage electrolyte, by means of the optimized combination of the ether nitrile compound, the lithium triflurosulfimide and the cyclic sulfate compound and other additives, a high voltage battery can be guaranteed to have excellent circulation performance, and meanwhile, the excellent high and low temperature performance of the high voltage battery of storage for 18 h in a full charge state at 85 DEG C and no lithium separation in the full charge state at 0 DEG C is considered.
Owner:GUANGZHOU TINCI MATERIALS TECH
Composite lithium-ion battery cell with low internal resistance, and preparation technology thereof
InactiveCN103579666AAvoid LithiumLower internal resistanceFinal product manufactureNon-aqueous electrolyte accumulator electrodesUltrasonic weldingInternal resistance
The invention provides a composite lithium-ion battery cell with low internal resistance, and a preparation technology of the composite lithium-ion battery cell, aiming at overcoming the defects. The battery cell internally comprises at least two single winding cells which are respectively provided with a positive pole lug and a negative pole lug; the pole lugs with the same polarity of the single winding cells are welded to form a whole body in a way of ultrasonic welding, so that the composite battery cell can be formed; the pole lugs of a positive pole piece and a negative pole piece of each single winding cell are arranged in the middle. After the composite lithium-ion battery cell is adopted, the internal resistance of a battery is effectively reduced under the condition that the battery capacity is not changed, so that the multiplying performance of the battery is improved, and the safety of the battery is improved.
Owner:维动新能源股份有限公司
Lithium-supplementing negative pole piece and preparation method thereof and lithium ion battery
InactiveCN112599723AEven and precise lithium supplementationImprove adhesionElectrolyte/reactants regenerationElectrode carriers/collectorsMetallic lithiumDischarge efficiency
The invention provides a lithium supplementing negative pole piece, which comprises a porous current collector, lithium supplementing coatings respectively positioned on the upper surface and the lower surface of the porous current collector, and an active substance layer positioned on the surfaces of the lithium supplementing coatings, wherein the through holes of the porous current collector arefurther filled with the lithium supplementing coatings, and the lithium supplementing coating comprises the following components in percentage by mass: 90-98% of metal lithium powder, 1-5% of a mixture of an electronic good conductor and a lithium ion good conductor and 1-5% of a binder. According to the invention, uniform and accurate lithium supplement of the silicon-carbon negative electrode can be realized, the first charge-discharge efficiency and the energy density of the battery are improved, and the conductivity of the silicon-carbon negative electrode piece is improved.
Owner:TIANJIN ENERGIES
Lithium-supplementing current collector, preparation method and application thereof, negative pole piece and lithium ion battery
InactiveCN111430723AAccurate Lithium SupplementationAvoid LithiumElectrode carriers/collectorsSecondary cellsInternal resistanceEngineering
The invention provides a lithium-supplementing current collector, a preparation method and application thereof, a negative pole piece and a lithium ion battery. The lithium-supplementing current collector comprises a current collector body and a lithium-supplementing material layer. The current collector body comprises a first carbon-coated layer, a substrate layer and a second carbon-coated layerwhich are arranged in sequence, wherein two adjacent layers of the first carbon-coated layer, the substrate layer and the second carbon-coated layer are tightly attached and fixedly connected; a plurality of through holes are formed in the first carbon-coated layer at intervals and penetrate through the substrate layer and the second carbon-coated layer; and the plurality of through holes are filled with the lithium supplementing material layer. According to the lithium-supplementing current collector disclosed by the invention, the current collector contains a lithium supplementing substance, so that accurate lithium supplementing of a silicon-carbon negative electrode can be realized, the internal resistance of the pole piece after lithium supplementing is reduced, and the rate capability and the cycle performance of a battery are improved.
Owner:TIANJIN ENERGIES
Composite diaphragm with lithium supplementing effect, and preparation method thereof and lithium ion battery
PendingCN112599928AImprove electrochemical performanceGood chemical propertiesElectrolyte/reactants regenerationCell component detailsHigh diaphragmCeramic coating
The invention provides a composite diaphragm with a lithium supplementing effect. The composite diaphragm comprises a base membrane, a first ceramic coating and a second ceramic coating which are respectively positioned on the upper surface and the lower surface of the base membrane, a lithium supplementing gel coating positioned on the upper surface of the first ceramic coating, and a gel coatingpositioned on the lower surface of the second ceramic coating. According to the invention, with the ceramic coating in the diaphragm, the temperature resistance of the diaphragm is improved, the thermal shrinkage of the diaphragm is improved, explosion caused by short circuit due to direct contact between a positive electrode and a negative electrode due to diaphragm deformation caused by thermalcontraction of the diaphragm at a high temperature is prevented, the lithium supplementing gel coating can realize uniform and accurate lithium supplementing of a silicon-carbon negative electrode sheet, a silicon-carbon negative electrode is prevented from being excessively lithiated to cause lithium precipitation, after lithium supplementing is finished, the gel coating and the electrode sheethave higher bonding force under the action of hot-pressing shaping, and the lithium ion good conductor powder remained in the lithium supplementing coating has good ionic conductivity, so that the conduction of lithium ions is promoted.
Owner:TIANJIN ENERGIES
Packaging method for reducing poor insulation of soft package lithium battery
InactiveCN112563574AAvoid breakageGuaranteed Design VolumeFinal product manufactureLi-accumulatorsEngineeringPlastic film
Owner:HEFEI GUOXUAN HIGH TECH POWER ENERGY
Lithium ion battery negative plate as well as preparation method and application thereof and lithium ion battery
ActiveCN105914343AAvoid LithiumAvoid deformationCell electrodesSecondary cellsElectrospinningPhysical chemistry
The invention discloses a lithium ion battery negative plate as well as a preparation method application thereof and a lithium ion battery, and belongs to the technical field of secondary lithium batteries. The negative plate is prepared in a method comprising the following steps of: in an inert atmosphere, uniformly distributing a solution containing a lithium compound onto the surface of the negative plate by adopting an electrostatic spinning technology, and drying. Lithium is supplemented on the surface of the negative plate in a wet method by adopting the electrostatic spinning technology, so that the lithium-containing compound is uniformly distributed on the surface of the negative plate to form a fibrous lithium strip with a relatively large specific surface area and a porous structure; compared with the existing lithium supplementing method in a spraying or dropwise adding manner, the lithium can be uniformly supplemented, a beneficial effect of precisely and controllably supplementing the lithium can be achieved, and lithium precipitation or deformation of the negative plate is effectively avoided.
Owner:LUOYANG LIRONG NEW ENERGY TECH
Lithium ion battery activation method
ActiveCN103066329AAvoid LithiumFinal product manufactureSecondary cells charging/dischargingActivation methodPower flow
The invention discloses a lithium ion battery activation method, which comprises the following steps that: 1, in a constant current charging stage, a current range is 0.02 to 0.1 CA, and the charging time is 1.5 to 3 hours; 2, in a constant current and constant voltage charging stage, the constant current range is 0.1 to 0.3 CA, the constant current charging is stopped until a preset voltage is reached, and the subsequent constant voltage charging is stopped until the current is 0.01 to 0.05CA; 3, in a constant current discharging stage, a current range is 0.05 to 0.2 CA, and the discharging time is 1 to 4 hours; 4, in a constant current and constant voltage charging stage, the constant current is 0.05 to 0.2 CA, the constant current charging is stopped until the preset voltage is reached, and the subsequent constant voltage charging is stopped until the current is 0.01 to 0.05CA; 5, in the constant current discharging stage, the current range is 0.05 to 0.2 CA, and the discharging time is 1 to 4 hours; and 6, in the constant current and constant voltage charging stage, the constant current is 0.05 to 0.2CA, the constant current charging is stopped until the preset voltage is reached, and the subsequent constant voltage charging is stopped until the current is 0.01 to 0.05CA. By the lithium ion battery activation method, a phenomenon that lithium ions are separated after a lithium battery is activated can be avoided.
Owner:SHENZHEN BAK POWER BATTERY CO LTD
Charging method for lithium ion battery
InactiveCN105048019AReduce temperature riseAvoid LithiumCell electrodesSecondary cells charging/dischargingPower flowElectrical battery
A charging method for a lithium ion battery comprises the following steps that constant current charging is carried out on the battery with the current Ia to the capacity of 2-10%, and then standing is carried out for time ta; constant current charging is continuously carried out on the battery with the current Ib to the capacity of 40-70%, and then standing is carried out for time tb; constant current charging is continuously carried out on the battery with the current Ic to the capacity of 80-95%, and then standing is carried out for time tc; the battery is charged with the constant voltage to the battery capacity of 100%, wherein Ib is larger than Ia and Ic. By means of the charging method, temperature rising of a battery core in the large-rate charging process is effectively reduced, bleeding of lithium in the charging process is effectively prevented, the circulation reversibility of the battery core is improved, and the circulation performance is improved.
Owner:NINGDE AMPEREX TECH
Coating roller for multi-pole battery coating machine and coating method for multi-pole battery pole piece
PendingCN108311335AContinuous coatingPrevent lithiumLiquid surface applicatorsElectrode manufacturing processesLithiumPole piece
The invention provides a coating roller for a multi-pole battery coating machine. The coating roller comprises a rotating shaft and a coating roller body. The rotating shaft is sleeved with the coating roller body and the coating roller body rotates around the rotating shaft. The coating roller body is in a cylindrical shape and is provided with a central shaft, and a plurality of grooves is formed in the outer peripheral wall of the coating roller body in the direction closing to the central shaft. The multiple grooves are arranged side by side in the direction of the central shaft. The invention further discloses a coating method for a multi-pole battery pole piece. According to the coating roller for the multi-pole battery coating machine and the coating method for the multi-pole battery pole piece, a backing roll does not need to be intermittently flicked, and the continuous coating of the coating machine is realized, the coating efficiency is high, the dressing area of the pole edge is increased, the lithium precipitation at the pole of a negative electrode is prevented, and the safety performance is high.
Owner:OPTIMUM BATTERY CO LTD
Vehicle-mounted power battery, chargeable and dischargable energy storage system and electric automobile
ActiveCN110525240ASimple structureReduce production processBatteries circuit arrangementsCharging stationsProduction linePower battery
The embodiment of the invention discloses a vehicle-mounted power battery. The vehicle-mounted power battery comprises a shell, a charging power receiving coil and a battery cell module. The shell comprises a groove arranged on the outer surface of the shell and a containing cavity arranged in the shell, the charging power receiving coil is contained in the groove and used for receiving energy from a power supply device and outputting the energy, and the battery cell module is contained in the containing cavity and is electrically connected with the charging power receiving coil and used for receiving and storing the energy output by the charging power receiving coil. The vehicle-mounted power battery is simple in structure, low in production line assembling difficulty and beneficial to improving the production efficiency. The embodiment of the invention further discloses a chargeable and dischargable energy storage system and an electric automobile.
Owner:HUAWEI DIGITAL POWER TECH CO LTD
Multifunctional composite negative plate, preparation method and secondary battery
PendingCN111312990AFunction increasePrevent low-temperature charging and lithium depositionSecondary cellsNon-aqueous electrolyte accumulator electrodesElectrical batteryStructural engineering
The invention discloses a multifunctional composite negative plate and a preparation method thereof, and a secondary battery. The multifunctional composite negative plate comprises a negative currentcollector layer and a negative active material layer. The negative electrode active material layer comprises a plurality of negative electrode active material assemblies. The negative electrode activematerial assemblies are prepared from a negative electrode material, a binder and a conductive additive, the plurality of negative electrode active material assemblies are distributed between the negative electrode current collector layer and the diaphragm in a two-dimensional laminated structure or a three-dimensional laminated structure, and the plurality of negative electrode active material assemblies have different physical properties or different chemical compositions. According to the invention, structural design is performed on the negative electrode active material layer, the multifunctional composite negative plate and the secondary battery give full play to the functions of different negative active material assemblies, the defects of single negative active material layer structure and short function in the prior art are overcome, and give consideration to the comprehensive excellent performances such as safety, rate capability, high and low temperature characteristics, service life, cycle life and the like.
Owner:TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD +1
A kind of method of replenishing lithium to lithium-ion battery positive plate
ActiveCN102916164BAvoid LithiumAvoid deformationElectrode manufacturing processesMetallic lithiumPhysical chemistry
Owner:DONGGUAN AMPEREX TECH +1
Secondary battery
ActiveCN110148714AImprove structural stabilityImprove cycle lifeNegative electrodesSecondary cellsGramPole piece
The invention relates to a secondary battery including a positive electrode pole piece, a negative electrode pole piece, an isolating membrane and an electrolyte. The positive electrode pole piece includes a positive active material layer containing a ternary positive electrode material. The negative electrode pole piece includes a negative active material layer, and active materials contain a carbon material A and a carbon material B. The carbon material B has a high reversible capacity and cooperates with the ternary positive electrode material to achieve a high gram capacity of the battery.Compared with the carbon material B, the carbon material A has a low degree of graphitization, a relatively large interlayer spacing and higher mechanical strength. The combination of the two carbonmaterials ensures that the negative electrode pole piece has both high reversible capacity and good pressure resistance, and the cycle life of the battery is improved.
Owner:CONTEMPORARY AMPEREX TECH CO
Lithium ion battery rapid charging method and lithium ion battery
The invention discloses a rapid charging method of a lithium ion battery and the lithium ion battery. The rapid charging method of the lithium ion battery comprises the following steps: detecting a limit state of charge corresponding to a first current of the lithium ion battery under a preset condition, wherein the limit state of charge is a state of charge in which the lithium ion battery is charged under the first current and the lithium ion battery starts to separate out lithium; obtaining a corresponding relation according to the first current and the limit state of charge; formulating a charging process according to the corresponding relationship; and charging the lithium ion battery according to the charging process. By detecting the limit state of charge corresponding to the first current under the preset condition, the corresponding relationship between different charging currents and the corresponding limit state of charge can be obtained by only performing an experiment once, and charging is performed according to the corresponding relationship, so lithium precipitation caused by overlarge charging current can be prevented.
Owner:SUNWODA ELECTRIC VEHICLE BATTERY CO LTD
Electrolyte infiltration method of lithium ion battery
ActiveCN113921917AIncrease inhalationFully contactedFinal product manufactureSecondary cells charging/dischargingElectrolytic agentChemical physics
The invention belongs to the technical field of lithium ion battery preparation, and particularly relates to an electrolyte infiltration method of a lithium ion battery. The electrolyte infiltration method of the lithium ion battery pole piece provided by the invention comprises the following steps of high-pressure liquid injection, primary shelving, primary pre-charging, secondary shelving, secondary pre-charging, tertiary shelving and liquid supplementation, and the step of secondary pre-charging is limited. The method is suitable for all lithium ion batteries, especially for square lithium batteries, and overcomes the problem that the infiltration effect of thick and large square batteries is difficult to improve. By adopting the method provided by the invention, the infiltration effect of the battery can be obviously improved, the electrolyte absorption amount is obviously increased, and the internal resistance of the battery is obviously reduced.
Owner:SVOLT ENERGY TECHNOLOGY CO LTD
Winding battery cell, battery and battery module structure
PendingCN111769334AImprove decarburization powder drop or copper leakageAvoid LithiumFinal product manufactureSecondary cellsStructural engineeringPole piece
The invention belongs to the technical field of battery production and manufacturing, and specifically relates to a winding battery cell. The winding battery cell comprises a positive plate (1), a negative plate (2) and an isolating membrane (3) arranged between the positive plate (1) and the negative plate (2). The positive plate (1), the isolating membrane (3) and the negative plate (2) are wound to form a winding core (4) of a hollow structure, and the radian alpha of the corner of the winding core (4) is smaller than 180 degrees and smaller than 0 degree. According to the invention, the problem of powder falling and even lithium precipitation at the corner due to overlarge stress at the corner of the pole piece in the battery cell can be improved, and the service life of the battery isprolonged. In addition, the invention also discloses a battery and a battery module structure.
Owner:JIANGSU ZENIO NEW ENERGY BATTERY TECH CO LTD
Pole piece with uniform thickness of tab ceramic coating and preparation method thereof
ActiveCN112490403AGuaranteed flatnessSolve uneven thicknessElectrode collector coatingNon-aqueous electrolyte accumulator electrodesCeramic coatingPole piece
The invention relates to the technical field of lithium batteries, and discloses a pole piece with uniform thickness of a tab ceramic coating and a preparation method thereof, aiming at the problems of easy short circuit and lithium precipitation in a tab area in the prior art, the pole piece (1) comprises a foil material (2), the foil material comprises a tab (2.1) and a middle area (2.2), and two sides of the middle area are coated with active substance coatings (3). The connection area of the middle area (2.2) and the tab (2.1) is coated with a ceramic coating (4), and the surface formed bythe ceramic coating (4) and the active substance coatings (3) is parallel to the foil (2). Through adoption of the tab ceramic coating method, the problem of internal short circuit of the battery canbe effectively solved, meanwhile, the tab is coated with the ceramic layer, it can be guaranteed that the thickness of the tab of the pole piece is consistent with that of the middle area, lithium precipitation of the battery can be effectively avoided, the safety of the battery is improved, the preparation process is simple, and the high-quality rate of finished products is high.
Owner:WANXIANG 123 CO LTD
A kind of fast charging method of lithium ion battery that can prevent lithium analysis
ActiveCN106099230BSafe Fast Charging MethodsFast fast charging methodSecondary cells charging/dischargingCharge currentEngineering
The invention discloses a lithium-ion battery rapid charging method capable of preventing lithium separation. The lithium-ion battery rapid charging method comprises the following steps: obtaining a lithium separation boundary when a lithium-ion battery is charged; according to the lithium separation boundary, setting a charging current rule of the lithium-ion battery; in the charging current rule, controlling charging current so that lithium separation of the lithium-ion battery does not occur; and charging the lithium-ion battery according to the charging current rule. The lithium-ion battery rapid charging method capable of preventing the lithium separation has the advantages that the charging current rule of the lithium-ion battery is set according to the lithium separation boundary when the lithium-ion battery is charged, safe and rapid charging is realized and the cycle life of the battery is not influenced.
Owner:TSINGHUA UNIV
Lithium ion battery and charging method thereof
ActiveCN113991197AImprove cycle lifeImprove cycle performanceSecondary cells charging/dischargingPhysical chemistryEngineering
The invention discloses a lithium ion battery and a charging method thereof. The charging method of the lithium ion battery is a charging voltage limiting method or a charging capacity limiting method, wherein the N / P ratio of the lithium ion battery is less than 1.02, and the N / P ratio is the ratio of the capacity of the negative pole piece per unit area to the capacity of the positive pole piece per unit area. According to the charging method of the lithium ion battery, the safety of the battery cell can be guaranteed, lithium separation in the charging process can be effectively prevented, the lithium ion battery is low in cost and high in energy density, and the cycle life is remarkably prolonged.
Owner:SHANGHAI ELECTRICAL GUOXUAN NEW ENERGY TECH CO LTD
Battery cell hot-pressing tool
PendingCN112820946AAvoid structural deformationSimple structureFinal product manufactureSecondary cells manufactureEngineeringMechanical engineering
The invention relates to the technical field of batteries, and provides a battery cell hot-pressing tool. The battery cell hot-pressing tool comprises a first hot-pressing piece with a first hot-pressing groove; a second hot-pressing piece which is provided with a second hot-pressing groove and is used for being matched with the first hot-pressing piece, wherein the height of the second hot-pressing piece relative to the first hot-pressing piece is adjustable; a hot-pressing inner core which is used for fixing a battery cell, is mounted on the first hot-pressing piece and is at least partially located in the first hot-pressing groove, or is mounted on the second hot-pressing piece and is at least partially located in the second hot-pressing groove. According to the embodiment of the invention, structural deformation of the battery cell in the cyclic charging and discharging process is avoided, so that lithium precipitation of the battery cell in the cyclic charging process is prevented, the energy density of the battery cell is improved, the cycle life of the battery cell is prolonged, and the structure is simpler.
Owner:DALIAN CBAK POWER BATTERY CO LTD
Pole piece, battery and manufacturing method of pole piece
ActiveCN112635717AEnergy density does not hurtAvoid LithiumSecondary cellsNegative electrodesElectrical batteryElectrical connection
The invention provides a pole piece, a battery and a manufacturing method of the pole piece, and relates to the technical field of batteries. The pole piece comprises: a tab, a current collector, a first coating material and a second coating material, the current collector comprises a first area and a second area, the tab is arranged on the current collector and electrically connected with the current collector, a first coating is arranged on the first area, and a second coating is arranged on the second area; the first coating comprises the first coating material, and the second coating comprises the second coating material; the first area is close to the tab and the second area is away from the tab; the first coating material comprises first graphite, the second coating material comprises second graphite, and the Raman spectrum peak value of the first graphite is larger than that of the second graphite. According to the technical scheme provided by the invention, the problem that existing lithium ions are easy to separate out lithium in the charging process is solved.
Owner:ZHUHAI COSMX BATTERY CO LTD
Lithium-supplementing positive electrode slurry and preparation method and application thereof
PendingCN113839042AReduce the impactExpanded processing windowCell electrodesElectrically conductive adhesiveMaterials science
The invention provides a lithium-supplementing positive electrode slurry and a preparation method and application thereof, the preparation method comprises the following steps: (1) mixing a solvent and a binder, adding a conductive agent, carrying out primary vacuum stirring, mixing with a lithium-supplementing agent, and carrying out secondary vacuum stirring to obtain a conductive adhesive solution; and (2) mixing the conductive adhesive solution with the positive electrode active material in three times, and adding the solvent to adjust the viscosity to obtain the lithium-supplementing positive electrode slurry. The lithium-supplementing agent is added into the conductive adhesive, so that the lithium-supplementing agent is preferentially mixed with a small amount of components such as the binder and the conductive agent to form the uniform conductive adhesive solution, then the adhesive solution is added into the positive electrode material, the positive electrode main material is infiltrated by the adhesive solution. The wetting angle of the glue solution to the positive electrode main material is less than 90 degrees, so that the processing steps are not increased, and the lithium supplement agent can be effectively dispersed.
Owner:EVE ENERGY CO LTD
Winding type battery cell and battery
PendingCN113078370AIncrease energy densityAvoid LithiumFinal product manufactureLi-accumulatorsEngineeringMechanical engineering
The invention discloses a winding type battery cell and a battery, and belongs to the technical field of batteries. The winding type battery cell comprises a positive plate and a negative plate, the positive plate comprises a first section and a second section, and the negative plate comprises a third section; the first section and the third section are respectively wound along a first direction to form a winding structure; the outermost ring of the first section is located on the inner side of the outermost ring of the third section, and the second section is wound in the second direction from the tail end of the first section so as to wrap the outermost ring of the third section; wherein the two sides of the third section are coated with symmetrically distributed negative electrode active material layers, and the surfaces of the first section and the second section are coated with positive electrode active material layers opposite to the negative electrode active material layers respectively. According to the scheme provided by the embodiment of the invention, the problem of lithium precipitation caused by the existence of a single-sided paste region in the existing negative plate can be relieved.
Owner:ZHUHAI COSMX BATTERY CO LTD
Preparation method of anti-overcharged lithium ion battery pole piece
ActiveCN108258194AAvoid LithiumImprove structural stabilitySecondary cellsElectrode collector coatingInternal resistanceThermal expansion
The invention discloses a preparation method of an anti-overcharged lithium ion battery pole piece and belongs to the technical field of preparation of battery pole pieces. The preparation method disclosed by the invention has the benefits that firstly, sodium dodecyl sulfate is mixed with deionized water to obtain a self-made dispersing liquid, so that the internal resistance of a lithium ion battery is increased, and the side reaction between a negative electrode and an electrolyte is reduced; in addition, particles have high thermal stability; polyethylene, 2-bromoanisole and N-methyl pyrrolidone are subjected to mixed reaction continuously to obtain self-made thermal expansion latex, wherein the polyethylene is a thermal expansion polymer, and once the battery is overcharged or over-discharged, the thermal expansion polymer can quickly expand; in addition, the 2-bromoanisole contains an ortho-bromo group, and the ortho-bromo group increases the stability of a benzene ring Pi bond conjugate system to a certain extent; adsorption products can hinder ion migration, charge transfer and the like, so that the overall impedance property of the battery is increased, and the anti-overcharge and cycle performances of the lithium ion battery pole piece are further improved; therefore, the application prospect is wide.
Owner:北电爱思特(江苏)科技有限公司
New energy automobile power battery top-speed flexible charging control method and system and automobile
InactiveCN112531226AFast chargingLittle impact on lifespanBatteries circuit arrangementsSecondary cells charging/dischargingNew energyLithium-ion battery
The invention discloses a new-source automobile power battery top-speed flexible charging control method and system and an automobile. The control method comprises the steps: employing a bidirectionalcharging system for generating a sine alternating current with the set frequency to conduct alternating current charging and discharging on a battery, performing rapid and efficient preheating on thebattery from inside to outside by means of ohm heat production of the battery, and stopping preheating after the set temperature is reached; and then charging the battery by adopting constant current, and after the voltage of the battery reaches a cut-off voltage, carrying out constant-voltage charging on the battery by the cut-off voltage. The charging speed of the new energy automobile is increased, battery lithium precipitation is avoided, the influence on the service life of the lithium ion battery is small, additional battery preheating equipment is not needed, implementation is easy, and the application prospect is very wide.
Owner:SHANDONG UNIV
Lithium battery negative electrode material, and preparation method of lithium battery applying lithium battery negative electrode material
PendingCN113991057AAvoid LithiumImprove conductivityNegative electrodesSecondary cellsPhysical chemistryCharge and discharge
The invention discloses a lithium battery negative electrode material, and a preparation method of a lithium battery applying the lithium battery negative electrode material. The preparation method comprises the following steps: firstly, activating a carbon-based material, then preparing an MOF@C composite material from the carbon-based material, a transition metal ion salt and a polydentate organic ligand by using a hydrothermal method, then proportioning the MOF@C composite material and a binder into negative electrode slurry with different binder contents, carrying out multilayer coating according to a sequence that the concentration of the binder is gradually reduced from the inner layer to the outer layer by adopting a slit type extrusion coating method so as to prepare a negative electrode piece, and finally assembling the negative electrode piece into the corresponding lithium battery. According to the prepared MOF@C composite material, the electrical conductivity is improved while the advantages of MOF are reserved, and active sites in the charging and discharging process are increased; and the multilayer coating mode is adopted to compensate for the influence caused by migration of the binder to the surface in the drying process, the peeling strength of the negative electrode material on the foil is effectively improved, meanwhile, preparation of a thick electrode is facilitated, and then the negative electrode capacity is improved.
Owner:HEFEI GUOXUAN HIGH TECH POWER ENERGY
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