26results about How to "Guaranteed cycle life" patented technology

The invention provides a regenerated lithium iron phosphate positive pole piece. The regenerated lithium iron phosphate positive pole piece comprises 70-90% of a recycled waste lithium iron phosphate positive pole material, 3-15% of a lithium supplement additive, 3-10% of a fast ion conductor and 3-5% of a binder, wherein the recycled waste lithium iron phosphate positive electrode material is obtained by discharging a decommissioned power battery until the voltage is reduced to 0.5 V or below, crushing a disassembled and separated positive electrode plate by adopting a physical method, adding the crushed positive electrode plate into a NaOH solution with the pH value of 10-14, stirring, centrifuging, washing and drying. The invention also provides a lithium iron phosphate battery which is a repaired and regenerated lithium iron phosphate battery prepared by prefabricating the lithium iron phosphate battery with the regenerated lithium iron phosphate positive pole piece and then carrying out pre-cycle repair treatment. According to the method, the problem of recycling the lithium iron phosphate positive electrode material in the power battery is solved, the electrochemical performance of the lithium iron phosphate battery is reliably ensured while the manufacturing cost of the lithium iron phosphate battery is reduced, and the requirements of commercial energy storage lithium batteries can be met.

The invention relates to the field of sodium-ion batteries, and discloses a sodium-ion battery positive electrode sodium pre-treatment method and a sodium-ion battery thereof.The sodium-ion battery positive electrode sodium pre-treatment method comprises the following steps that a sodium pre-treatment material and positive electrode slurry are mixed to form sodium pre-treatment functional slurry; coating a current collector with the positive electrode slurry, and drying to form a basic function layer; coating the basic functional layer with the pre-sodium-modified functional slurry, and drying to form a pre-sodium-modified functional layer; wherein the pre-sodium-modified material is a sodium-rich material, and the sodium-rich material at least comprises at least one of Na2S, NaCrO2, Na2NiO2, Na2CO2 or Na2C4O2. According to the invention, the pre-sodium-modified functional layer is arranged on the basic functional layer, so that the first efficiency and the reversible capacity of the battery are improved, and the cycle life of the battery is prolonged.

The embodiment of the invention provides a charging method and device, electronic equipment and a storage medium, and belongs to the technical field of lithium ion batteries, and the method comprises the steps: detecting whether a charging voltage value is smaller than a first preset threshold voltage value or not; if the charging voltage value is smaller than the first preset threshold voltage value, pre-charging the to-be-charged battery based on the first preset current until the charging voltage value reaches the first preset threshold voltage value, and controlling the to-be-charged battery to enter a constant-current charging stage; charging the to-be-charged battery based on a second preset current until the capacity value of the to-be-charged battery reaches a preset capacity threshold value, and entering a multi-stage constant-voltage charging stage; according to each charging voltage determined in the preset charging voltage range, performing stage charging on the to-be-charged battery until the charging voltage value reaches a second preset threshold voltage value, and controlling the to-be-charged battery to enter a final constant voltage charging stage; and when the charging current value is reduced to the charging current threshold value, charging is stopped. Through the provided scheme, the charging efficiency is improved, and the risk of battery damage is reduced.

The invention provides a negative plate, a battery and electric equipment. The negative plate comprises a negative current collector; the negative electrode active layer is arranged on the surface of at least one side of the negative electrode current collector; the negative electrode active layer comprises silicon dioxide nanowires, and the mass ratio of the silicon dioxide nanowires in the negative electrode active layer is 0.1%-5%. On one hand, the silicon dioxide nanowires can enhance the electrolyte infiltration effect of the negative plate and ensure the flexibility and the electrolyte retention capability of the negative plate; and on the other hand, active ions in the electrolyte can be more easily embedded and separated, so that the first effect and the cycle life of the battery are ensured.

The invention relates to the technical field of lithium batteries, in particular to a rapid charging method of a lithium iron phosphate battery and a cycle life testing method, and the rapid charging method comprises the following steps: carrying out at least one section of constant current charging on the lithium iron phosphate battery; and stopping charging the lithium iron phosphate battery when the current of the tail-section constant current charging is not greater than the set current and the cut-off voltage of the constant current charging is not less than the set cut-off voltage. According to the rapid charging method provided by the invention, the lithium iron phosphate battery is subjected to multi-section constant-current charging, so that the charging time of the lithium iron phosphate battery is shortened, the rapid charging capability of the lithium iron phosphate battery is improved, and the technical problem of inaccurate SOC estimation of the lithium iron phosphate battery system by a traditional rapid charging method is solved.

The invention relates to the technical field of batteries, and discloses a battery, a battery box and an electric automobile, and the battery comprises a battery cell which comprises a body part and a battery cell output part, and one end, connected with the body part, of the battery cell output part is a root part of the battery cell output part; the electrode terminal assembly is welded with the battery cell output part and forms a first connecting area, and the first connecting area is provided with a first edge close to the body part and a second edge far away from the body part in the first direction; wherein in the state that the battery cell output part is leveled in the first direction, the distance between the root part and the second edge is a, the distance between the root part and the first edge is b, the fault rate of the battery cell output part in the first connection area is c, and b / (a * c) is larger than or equal to 0.003 and smaller than or equal to 0.04. The over-current capability between the electrode terminal assembly and the battery core output part is ensured, the voltage jump of the battery is avoided, the reliability of the battery is ensured, the safety problems of thermal runaway of the battery and the like are avoided, and the safety performance of the battery is ensured.

The invention discloses a gel-resistant positive electrode slurry and porous electrode preparation. The positive electrode slurry in the invention gels slowly, and the surface and the inside of the electrode after drying have pores, which are helpful to increase the electrode liquid retention, improve the rate performance of the battery core, and reduce the polarization of the electrode. The invention uses glycolic acid, acetic acid, anhydrous oxalic acid, and anhydrous citric acid as pore formers. The pore formers are added after part of the organic solvent has been added to the stirring tank, which can avoid the corrosion of the tank body by the acidic pore former. The pore former can be miscible with N-methylpyrrolidone to ensure the uniformity of the dispersion of the pore former in the slurry. By controlling the drying temperature of the electrode, controlling the volatilization speed of glycolic acid and acetic acid and the decomposition speed of anhydrous oxalic acid and anhydrous citric acid, the porosity of the electrode is improved, and the structure of the electrode is ensured not to be destroyed. The pore former used in the present invention is a weakly acidic substance, which can neutralize the residual alkali on the surface of the positive electrode material, adjust the pH of the slurry, and has the effect of alleviating the gelation of the slurry.

This utility model relates to the field of battery cell technology and discloses a novel soft-pack PACK structure, including a housing. A cover is fixedly connected to the outer wall of the housing, and a sealing ring is fixedly connected to the inner wall of the cover. A support is installed inside the housing, and an epoxy board is fixedly connected to the outer wall of the support. Copper-aluminum composite busbars are installed on the left and right outer walls of the epoxy board, with threaded rods threaded into the interior of the copper-aluminum composite busbars. An aluminum busbar is fixedly connected inside the epoxy board, and a pressure strip is provided on the outer wall of the aluminum busbar. In this utility model, the housing and cover house the battery cells to protect them from external impact damage. An epoxy board is placed on the side of the support, and then an aluminum busbar is installed inside the epoxy board. A pressure strip is then fixed to one side of the aluminum busbar, and a data acquisition line is placed between the pressure strip and the aluminum busbar. This achieves the effects of ensuring battery cell overcurrent, welding strength, and stable data acquisition.

The invention discloses a battery module and a battery pack. The battery module comprises a battery pack, and the battery pack comprises a plurality of battery cells which are sequentially arranged along a first direction; the end plate assemblies are arranged at the two ends of the battery pack in the first direction, each end plate assembly comprises an end plate and a buffer layer, the buffer layers are arranged on the sides, close to the battery pack, of the end plates, and the buffer layers are attached to the corresponding battery cells; a concave part is arranged in the middle area of the side, facing the buffer layer, of the end plate, a convex part is arranged in the middle area of the side, facing the end plate, of the buffer layer, and the concave part and the convex part are correspondingly arranged in a matched mode. The battery pack comprises a box body, a mounting cavity is formed in the box body, and supporting beams are arranged at the two ends of the mounting cavity in the first direction; the battery pack is mounted in the adaptive mounting cavity, one side, far away from the battery pack, of the end plate is connected with the supporting beam, and the other side, in the third direction, of the battery module is fixed in the box body through heat-conducting glue. Through the buffer structure, the expansion uniformity of the battery cell is improved, and local stress concentration is reduced, so that the performance of the battery cell is ensured, and the long cycle life of the battery module and the battery pack is maintained.

The utility model discloses a battery monomer and a battery module. The battery monomer comprises a shell, a one-way gas-permeable membrane and an electrode assembly, a one-way breathable film is arranged on the shell; the electrode assembly is positioned in the shell and is connected with a polar terminal at the top of the shell; and the polar terminal is provided with a mounting part for mounting the heat exchange tube. According to the utility model, the single battery is provided with the one-way gas-permeable membrane, the one-way gas-permeable membrane can discharge gas generated in the single battery out of the single battery shell, and when the single battery is assembled into the battery module, the gas pressure in the gas area of each single battery can be basically kept consistent, so that the cycle life of the battery module is ensured; and the probability of thermal runaway of the battery module is reduced.

This invention relates to the field of lithium battery technology, and in particular to a method for preparing a lithium-ion battery cell. The invention discloses a method for preparing a lithium-ion battery cell, comprising: first, preparing a positive electrode slurry containing modified titanium aluminum carbide, graphene oxide, etc., and a negative electrode slurry containing aminated carbon nanotubes, zinc aluminum spinel, etc., both processed according to specific proportions and processes; second, coating the positive and negative electrode slurries separately onto a current collector, and obtaining positive and negative electrode sheets through drying, coating with a coating agent, etc.; next, preparing a composite separator coated with a separator coating agent and curing it; finally, winding the separator in a positive-separator-negative-separator sequence, and obtaining a lithium-ion battery cell through drying, encapsulation, electrolyte injection, formation, etc.

The invention discloses a lithium-containing multi-metal composite hydrocarbon derivative polymer coating, and discloses a preparation method of the lithium-containing multi-metal composite hydrocarbon derivative polymer coating. A metal organic thin film is formed on the surface of a positive electrode material through molecular layer deposition, the thin film contains a lithium element, the metal organic thin film is a hybrid thin film formed by a metal center and an organic ligand, and the invention further discloses application of the lithium-containing multi-metal composite hydrocarbon derivative polymer coating in a lithium battery positive electrode. The problems that in the prior art, a positive electrode material faces volume change and unstable interface side reaction in the circulation process, and the ionic conductivity of a polymer coating at the present stage is low are solved, so that the mechanical stability and the interface stability of the positive electrode material are improved, ion transmission at an electrode interface is promoted, and the positive electrode performance is improved.

The invention discloses a highly safe lithium ion battery positive electrode sheet and a lithium ion battery comprising the positive electrode sheet, wherein the positive electrode sheet comprises a positive electrode current collector and a positive electrode active material layer attached to the positive and negative surfaces of the positive electrode current collector, the surface of the positive electrode current collector is coated with an inorganic polysilazane-polydopamine-graphene composite coating, and the positive electrode active material layer is coated on the surface of the inorganic polysilazane-polydopamine-graphene composite coating. The highly safe lithium ion battery positive electrode sheet of the invention has the characteristics of effectively avoiding copper precipitation, avoiding heat accumulation, excellent rate performance and good cycle life.

The present invention provides a regenerated lithium iron phosphate positive electrode sheet, comprising: 70-90% of recycled waste lithium iron phosphate positive electrode material, 3-15% of lithium supplement additive, 3-10% of fast ion conductor, and 3-5% of binder; wherein the recycled waste lithium iron phosphate positive electrode material is obtained by discharging the retired power battery until the voltage is reduced to below 0.5V, crushing the disassembled and separated positive electrode sheet by physical method, adding it to a NaOH solution with a pH of 10-14, stirring, centrifugal treatment, water washing, and drying. The present invention also provides a lithium iron phosphate battery, which is obtained by pre-fabricating a lithium iron phosphate battery using the regenerated lithium iron phosphate positive electrode sheet, and then undergoing a pre-cycle repair treatment to obtain a repaired and regenerated lithium iron phosphate battery. The present invention solves the problem of recycling lithium iron phosphate positive electrode materials in power batteries, while reducing the manufacturing cost of lithium iron phosphate batteries, reliably guarantees the electrochemical performance of lithium iron phosphate batteries, and can meet the requirements of commercial energy storage lithium batteries.

This invention relates to an intelligent thermal management control method for power batteries, comprising: acquiring real-time operational monitoring data of the power battery, including battery temperature distribution, current, voltage, SOC, power, and vehicle operating conditions; constructing and continuously updating an adaptive dynamic thermal characteristic model of the power battery based on the real-time operational monitoring data, used to describe the mapping relationship between battery heat generation, heat dissipation, and temperature changes under the current battery aging level and vehicle operating conditions; dynamically adjusting the adaptive dynamic thermal characteristic model and combining it with predicted battery usage needs through a model predictive control algorithm to predict battery temperature changes within a preset time period and calculate the optimal thermal management control sequence; and dynamically executing thermal management actions based on the optimal thermal management control sequence, the vehicle operating conditions, and the initial temperature range of the battery, to manage battery temperature more efficiently.

The utility model relates to a battery module which comprises a box body, a battery cell assembly and an elastic component, and the box body is concavely provided with a mounting groove; the battery cell assembly comprises a plurality of battery cells arranged side by side in the first direction and end plates located on the two outermost sides of the battery cells in the first direction respectively, the battery cell assembly is arranged in the mounting groove, and the end plates and the groove wall of the mounting groove are arranged at intervals; and the elastic component is inserted between the end plate and the groove wall of the mounting groove and is always propped against the battery cell assembly. According to the battery module disclosed by the utility model, through the arrangement of the elastic component, the pre-tightening force can be applied to the battery cell assembly, so that the battery cell can resist expansion caused by charging and discharging, the expansion amount of the battery cell is reduced, and the structural stability of a winding layer in the battery cell is ensured, thereby ensuring the cycle service life of the battery cell; and the elastic component has certain elasticity, provides a pre-tightening force for the battery cell assembly and can also provide a certain buffer space for the battery cell assembly, so that the situation of deformation caused by overlarge extrusion force of the battery cell due to rigid abutting is avoided.

The utility model relates to battery technical field discloses a lithium battery oven heating plate, including substrate, the one side surface of substrate is equipped with heating film, heating film includes mould body and is embedded in the heating element of mould body and is arranged in continuous circuit, the distribution density of heating element presents increasing setting along the central region of mould body to edge region, the one side of heating film away from substrate is equipped with heat conduction layer, and heat conduction layer includes multiple heat conduction parts that are arranged in interval, the utility model discloses through heating film can be pertinence compensation oven edge heat loss, and the temperature gradient is weakened from the heat source distribution level, and the heat conduction layer of interval arrangement further realizes the uniform conduction of heat, and the heating uniformity is greatly promoted, guarantees the battery capacity consistency and cycle life, the present application significantly improves temperature uniformity and reduces energy consumption, solves the problem that traditional heating plate thermal stress cracks and edge heat dissipation is too fast, is applicable to large -scale lithium battery drying process.

The invention provides a front edge beam structure for a battery pack, the battery pack and a vehicle, and belongs to the technical field of battery packs, the battery pack comprises a first shell, an electrical assembly and a second shell which are sequentially arranged in the first direction, and the front edge beam structure comprises an edge beam body and a connecting piece; the boundary beam body is used for being connected with one of the first shell piece and the second shell piece, one side of the connecting part of the connecting piece is used for being connected with the end, in the second direction, of the other one of the first shell piece and the second shell piece, the second direction is perpendicular to the first direction, and the other side of the connecting part is connected with part of the boundary beam body. A distance is formed between the bearing part of the connecting piece and the boundary beam body in the second direction; a first distance between one side, deviating from the connecting part, of the bearing part and one of the first shell part and the second shell part is smaller than or equal to a second distance between a battery cell in the electrical assembly and one of the first shell part and the second shell part; the front edge beam structure is good in structural stability and beneficial to prolonging the service life of the battery pack.

The application provides a liquid cooling plate, which is provided with a working medium inlet, a working medium outlet, a liquid inlet channel and a flow guide channel; the liquid inlet channel is directly communicated with the working medium inlet; the flow guide channel is directly communicated between the working medium outlet and the liquid inlet channel; the working medium inlet is located at a first end of an overall channel formed by the liquid inlet channel and the flow guide channel, and an end of the liquid inlet channel close to the flow guide channel is located at a second end of the overall channel away from the first end, so that the cooling working medium directly flows from the working medium inlet to the second end. By limiting the liquid inlet channel to extend from the first end to the second end, the cooling working medium can flow to the area of the overall channel relatively far from the working medium inlet, so that the temperature difference near the first end and the second end is relatively small, and then the cooling working medium can be fully heat exchanged through the flow guide channel, so that the temperature difference of the liquid cooling plate in the area far from the working medium inlet and close to the working medium inlet is relatively small under the condition of ensuring that the cooling working medium fully plays its heat exchange capacity.

The invention relates to the technical field of lead-acid storage battery pole plate manufacturing, and discloses a high-rate discharge lead-acid storage battery lead paste which is prepared by a battery lead paste preparation process and comprises positive lead paste and negative lead paste in percentage by mass, the positive lead paste comprises lead powder with the oxidation degree of 75-82%, pure water with the mass being 8-11% of that of the lead powder, acid liquor with the mass being 11-11.5% of that of the lead powder and an additive with the mass being 0.18-0.45% of that of the lead powder; except for basic lead powder, pure water and acid liquor, polyester staple fibers and spherical graphite with different mass ratios are added into positive lead paste, polyester staple fibers, precipitated barium sulphate, lignin, humic acid and acetylene black with different mass ratios are added into negative lead paste, so that the apparent specific gravity of the prepared positive lead paste is 4.2-4.3%, the apparent specific gravity of the prepared negative lead paste is 4.4-4.5%, and the apparent specific gravity of the prepared negative lead paste is 4.2-4.3%. The requirements are met, the large-current and high-rate discharge requirements are met, the utilization rate and the discharge capacity of active substances are improved, and the floating charge service life and the cycle service life of the battery are ensured.

The application provides a preparation method of a composite diaphragm, the composite diaphragm and a battery, and relates to the technical field of batteries. The preparation method comprises the following steps: firstly, providing a slurry and a base film, wherein the slurry comprises a binder and an organic solvent, the binder has polarity, and the base film is a porous polymer base film; then, immersing the base film into the slurry to obtain a modified diaphragm; subsequently, performing freezing treatment on the modified diaphragm; finally, performing drying treatment on the frozen modified diaphragm under the condition of lower than-30 DEG C to obtain a composite diaphragm; and the composite diaphragm prepared through the preparation method has good adhesion, good wettability and high ionic conductivity.

The invention provides a nano laminated structure film with multi-resistance-state non-volatility and a preparation method and application thereof, and belongs to the technical field of microelectronic materials. The novel superlattice-like Ge2Sb2Te5 / Sb7Se3 thin film is formed by constructing a nano laminated structure, complementary advantages of the Ge2Sb2Te5 and the Sb7Se3 thin film are achieved, and the phase change performance of the thin film is regulated and controlled by regulating and controlling the thickness ratio, the interface number, the total thickness and other structural parameters of the Ge2Sb2Te5 thin film and the Sb7Se3 thin film. Multi-configuration and non-volatile information storage is realized by using a stress effect and an interface effect existing between layers in the nano laminated structure. Meanwhile, the existence of the interface can induce the phase change material to accelerate crystallization and generate phonon scattering, so that the phase change speed is improved, and the heat conductivity and the RESET operation power consumption are reduced. The nano laminated structure thin film with the multi-resistance-state non-volatility can be widely applied to big data mass storage and neuromorphic calculation in 5G, Internet of Things, cloud computing and artificial intelligence times.

This application discloses a method for preparing lithium manganese iron phosphate, a cathode material, and a lithium-ion battery, relating to the field of battery technology. This application uses a manganese source and an iron source to obtain manganese iron oxide through solid-state sintering, wherein at least one of the manganese source and the iron source is an oxide. The manganese iron oxide is then mixed with a lithium source and a phosphorus source in a solid-state mixture, and solid-state sintering is performed at 350–900°C to obtain lithium manganese iron phosphate. The preparation method provided by this application can reduce the use of sulfate, thereby reducing the generation of toxic sulfur dioxide gas. Furthermore, it facilitates the synthesis of high-purity, high-tap-density lithium manganese iron phosphate materials, reduces process costs, and improves the performance of the obtained lithium manganese iron phosphate materials. The cathode material and lithium-ion battery provided by this application include lithium manganese iron phosphate prepared by the above method.

The invention relates to the technical field of lithium battery manufacturing, in particular to a winding needle assembly and battery cell manufacturing equipment. The winding needle assembly comprises a first winding needle and a second winding needle which are matched with each other and are oppositely arranged; the first winding needle comprises a first plane, a second plane and a first cambered surface, the first plane and the second plane are parallel to each other, and the first cambered surface is located on the side, away from the second winding needle, of the first winding needle; the second winding needle comprises a third plane, a fourth plane and a second cambered surface, the third plane and the fourth plane are parallel to each other, and the second cambered surface is located on the side, away from the first winding needle, of the second winding needle; when the first winding needle and the second winding needle are combined together, the third plane and the first plane are located on the same plane, and the fourth plane and the second plane are located on the same plane. The service life of the battery cell can be effectively prolonged, and the use safety of the battery cell can be effectively improved.

The invention discloses a screening method of rice husks for preparing a battery negative electrode material, the battery negative electrode material and a preparation method.The screening method of the rice husks for preparing the battery negative electrode material comprises the following steps that in the air atmosphere, the rice husks are heated to 600-1000 DEG C from the room temperature at the heating rate of 0.5-20 DEG C / min, the rice husks are heated to the temperature of 600-1000 DEG C at the heating rate of 0.5-20 DEG C / min, and the rice husks are cooled to the room temperature; meanwhile, recording weight loss ratios of the rice hulls at different temperatures, and drawing a thermogravimetric curve; and calculating the ratio of the carbonization loss weight of cellulose and hemicellulose to the carbonization loss weight of lignin in the rice hulls according to the thermogravimetric curve, and screening the rice hulls for preparing the battery negative electrode material. The battery negative electrode material prepared from the rice husks with the ratio of more than 1.14 has excellent cycling stability, first-effect coulomb, rate and other performances, provides guarantee for the safety and cycle life of a lithium battery, and also provides guarantee for commercialized large-scale production of the negative electrode material prepared from the rice husks.

The invention discloses a positive active material for a power battery and a production process thereof, the positive active material for the power battery comprises major materials and auxiliary additives, the major materials comprise 80-85% of lead powder; 4%-9% of sulfuric acid; 7.5%-11.5% of pure water; the auxiliary additive comprises the following components in percentage by weight: 0.1%-0.20% of graphite; 0.08%-0.12% of short fibers; 0.08% to 0.1% of antimony trioxide; 0.09% to 0.14% of stannous mono-sulphate; 0.3%-0.7% of glass fiber; and 0.2%-0.5% of lithium hydroxide. Medium-long glass fibers are arranged to construct a macroscopic framework to provide millimeter-level support, the overall deformation resistance of the lead plaster is effectively improved, microcosmic pores of the lead plaster are accurately filled with superfine short fibers, microcosmic bonding among particles is effectively enhanced, the superfine short fibers and the microcosmic pores are combined to form a continuous'micro-medium-macro 'three-level reinforced network, and the microcosmic bonding is effectively enhanced. The contradiction that traditional fibers are difficult to disperse if being long and weak in support if being short is solved, so that the bonding force between the adjusted lead paste and the grid is greatly improved, the falling rate of active substances is reduced, and the lead paste is more suitable for being used in a high-frequency vibration scene.