74results about How to "Guaranteed Energy Density" patented technology

A positive electrode sheet and a lithium ion battery are provided. A positive electrode sheet includes: a current collector; A first active material layer; And a second active material layer; Whereina first active material layer is disposed between the current collector and the second active material layer, the first active material layer and the second active material layer each comprising a binder, and the binder content in the first active material layer is greater than the binder content in the second active material layer. In the present application, the active material in the positive electrode sheet adopts a two-layer design, and the content of the binder in the first active material layer is higher than that in the second active material layer, so that the energy density of the lithium ion battery is ensured, and the purpose of improving the bonding force of the active material layer and the safety performance of the lithium ion battery is achieved.

The invention discloses a preparation method of a high-rate graphite anode material, the anode material and a lithium-ion battery. The method comprises the following steps: mixing a carbon material, an adhesive and a conductive agent to prepare slurry; carrying out spray drying granulation or extruding kneading granulation on the slurry to obtain particles of which the particle sizes are 5-30 microns; putting the particles into a rotary sintering furnace, carrying out sintering in an inert atmosphere, carrying out heat preservation for 2 hours and cooling the particles to a room temperature to obtain a bulk material; scattering the bulk material into the particles of which the particle sizes are 5-30 microns; and impregnating the scattered material with liquid asphalt or resin, putting the impregnated material into the rotary sintering furnace, sintering the impregnated material in the inert atmosphere, scattering the obtained material into the particles of which the particle sizes are 5-30 microns again, and carrying out graphitization at 3,000-3300 DEG C to obtain the high-rate graphite anode material.

The invention discloses a preparation method of a nickel cobalt lithium manganate composite anode material. The preparation method is characterized by comprising the following steps: 1), with the nickel cobalt lithium manganate or the nickel cobalt lithium manganate doped with metal ions as a substrate and the lithium manganate fine powder as a coating material, uniformly mixing the nickel cobalt lithium manganate substrate or the nickel cobalt lithium manganate substrate doped with metal ions, the lithium manganate fine powder and a bonding agent in weight percentage, wherein the additive amount of the lithium manganate fine powder is 0.1% to 40% of the composite anode material in percentage by weight, and the additive amount of the bonding agent is 0.1% to 5% of the composite anode material in percentage by weight; and 2), putting a mixture obtained in the step 1) into a reacting furnace, performing sectional sintering in air or oxygen atmosphere, heating to 300-700 DEG C firstly, processing for 1-20 hours at the constant temperature, and then heating to 800-1000 DEG C, and processing for 1-20 hours at the constant temperature, cooling naturally, and processing the powder, so as to obtain the nickel cobalt lithium manganate composite anode material.

Weight percent of components of cathode material is as following: anilin-benzoquinone composite polymer 65-75%, adhesive 5-15% and conduction agent 15-25%; Steps for preparing anilin-benzoquinone composite polymer are as following: according to mol ratio, dissolving benzoquinone, H+, H2O2, (NH4)2S2O8 into acetonitrile; reaction is carried out under protection of inert gases; deposited matter in brownish black color is obtained after washing reactant by using acetonitrile and deionized water; drying deposited matter obtains composite polymer needed. Advantages are: there is composite structure of electronic conduction framework + electrochemical oxidation-reduction functional group in same molecule. Thus the invention ensures both of energy density and cycle performance. Features are simple composite procedure, no pollution, and good cycle performance.

The invention discloses a high-energy-density lithium ion power battery, and belongs to the technical field of manufacturing of lithium ion batteries. The high-energy-density lithium ion power batteryis formed by assembling a positive electrode plate, a negative electrode plate, a diaphragm, an electrolyte solution and an external package; the positive electrode plate is composed of a positive electrode current collector and a positive electrode slurry coating the positive electrode current collector, the positive electrode slurry is composed of a positive electrode active substance, a positive electrode conductive agent and a positive electrode binder, and the positive electrode active substance is cobalt nickel lithium manganate; the negative electrode plate is composed of a negative electrode current collector and a negative electrode slurry coating the negative electrode current collector, the negative electrode slurry is composed of a negative electrode active substance, a negative electrode conductive agent and a negative electrode binder, and the negative electrode active substance is a mixture of a silicon-carbon oxide material and a silicon carbon material, and the negative electrode binder is polyacrylic acid; the electrolyte solution is composed of lithium hexafluorophosphate, ethylene carbonate, ethyl methyl carbonate, fluoroethylene carbonate, vinylene carbonate and difluorosulfonamide lithium. The energy density of the battery is guaranteed, the cycle performance of the battery is improved, and the requirements of the power battery on the cycle life are met.

The invention relates to an automatic idling system based on multiple hydraulic accumulators and a control method. Based on a power battery electric quantity storage unit, the flow changing function of a hydraulic pump is achieved through the structure that a frequency-conversion power motor is adopted in a power system for driving the constant-flow hydraulic pump, the high-efficiency driving performance and the good control characteristic of frequency-conversion speed control are fully utilized, and the power system can be matched with a load in a full-power manner. Due to the fact that a composite energy combination of a power battery and the multiple sets of hydraulic accumulators is adopted, the beneficial effects of the electric quantity storage unit with relatively high energy density and the beneficial effects of a hydraulic accumulator energy storage unit with relatively high power density are integrated, the energy density is ensured through the power battery, the first hydraulic accumulator is used for providing or absorbing instantaneous large power of a hydraulic drive system, the second hydraulic accumulator is used for providing auxiliary driving for special working conditions, and various power requirements of a hydraulic excavator in complex working conditions are met.

The invention provides a preparation method for a perpendicular LED chip structure. The preparation method comprises the steps of 1) providing a growth substrate, and forming an epitaxial layer on the growth substrate; 2) forming a metal electrode layer and a bonding substrate on the epitaxial layer in sequence; and 3) peeling off the growth substrate by low-energy laser, wherein the overlapping ratio of adjacent two small light spots is greater than 50%. The invention also provides the perpendicular LED chip structure, wherein the perpendicular LED chip structure comprises the bonding substrate, and the metal electrode layer, a P-GaN layer, a multi-quantum-well layer and an N-GaN layer which are positioned on the bonding substrate in sequence, and a passivation layer and an N electrode which are positioned on the surface of the N-GaN layer in sequence. By adoption of the preparation method, the problem of cracking or severe deformation of the bonding substrate easily caused by high wafer stress after bonding in the perpendicular process of the large-dimensional LED chip is solved; and meanwhile, the problems of severe electric leakage and extremely low rate of finished products directly caused by severe microcosmic influence of the epitaxial layer structure and the performance are also solved.

The invention relates to the technical field of lithium-ion battery anode materials and in particular relates to a preparation method of a nickel cobalt lithium manganate composite anode material. By utilizing the preparation method, recycling of lithium manganate fine powder is realized, the safety performance of the material can be improved by adding the lithium manganate into ternary material, frit reaction among particles is strengthened by adding a binding agent so that the lithium manganate fine powder is tightly coated on the surface of the ternary particles so as to improve product stacking density, and side reaction between the material and electrolyte can be obstructed by the binding agent remained on the surface of the nickel cobalt lithium manganate composite anode material after high-temperature fusion so as to improve the cycle performance of the material and further improve the safety performance of the material. Compared with the prior art, by utilizing the composite anode material, energy density of nickel cobalt lithium manganate is kept and the safety performance is improved. The composite anode material is one of optimal anode materials applied to power batteries of electromobiles, electric power tools and the like.

The invention relates to a processing method for carrying out focused microwave cutting on a brittle material, which is characterized in that microwave energy high-density focusing is realized by using a tapered waveguide, and microwave beams are emitted to the surface of a workpiece from the front end of the tapered waveguide in a high energy density beam mode so as to heat the workpiece, thereby realizing the cutting processing according to the principle of a hot cracking method. The waveguide comprises a cone-shaped mode converter by which the microwave focusing can be realized; and the processing device is provided with a three-dimensional operating platform by which the processing requirements of any curve can be realized. The invention also relates to a processing device for carrying out microwave cutting on a brittle material by using the processing method.

The invention discloses a method for improving electrolytic solution resistance of a lithium battery negative electrode binder through irradiation, and belongs to the technical field of lithium batteries. The method comprises the following steps: preparing a lithium battery containing a negative electrode taking sodium carboxymethyl cellulose (CMC-Na) and styrene-butadiene rubber emulsion (SBR) asbinders; and placing the whole battery on an under-beam device of an electron beam irradiation accelerator, and irradiating the whole lithium ion battery, wherein the irradiation dose is 10 to 100 kGy, the irradiation dose rate is 2-10 kGy / s, and in the negative electrode, CMC-Na and SBR can generate intramolecular and intermolecular chemical cross-linking so as to improve the electrolytic solution resistance of the binders CMC-Na and SBR in the negative electrode sheet, reduce the swelling of the binders CMC-Na and SBR in the electrolytic solution, reduce the thickness expansion rate of thenegative electrode sheet in the battery circulation process, improve the capacity retention rate of the battery and prolong the service life of the battery. The process is simple and easy to implement, low in cost and suitable for consumer electronic lithium batteries and power type lithium batteries.

The invention discloses an NCMA quaternary gradient material and a preparation method thereof. The material sequentially comprises an inner core structure, a shell structure and a coating layer from inside to outside, wherein the coating layer contains an element Mg, a chemical general formula of the material except the coating layer is LiNixCoyMnzAlwO2, and values of x, y, z and w simultaneouslymeet the following conditions, 0.8 < / = x < / = 1, 0 < / = y < / = 0.1, 0 < / = z < / = 0.2, 0 < / = w < / = 0.1, and x + y + z + w = 1, a general chemical formula of the core structure is LiNiaCoyMnbAlwO2, a general chemical formula of the shell structure is LiNicCoyMndAlwO2, a is larger than or equal to 0.8 and smaller than or equal to 1, b is larger than or equal to 0 and smaller than or equal to 0.2, a is larger than x, b is smaller than z, and a + y + b + w = 1, c is larger than 0 and smaller than or equal to 0.6, d is larger than or equal to 0.3 and smaller than or equal to 0.9, c is smaller than x, dis larger than z, and c + y + d + w = 1. The material is advantaged in that cycle performance of the high-nickel material can be effectively improved while a high-nickel structure is guaranteed, the method is simple in manufacturing process and high in operability, industrial production of the high-nickel material is facilitated, and problems that in the prior art, cycle performance of the high-nickel material is poor, and the manufacturing environment requirement is high are solved.

The invention provides an electrode plate, and a battery containing the same. The electrode plate comprises a current collector, a first coating and a second coating; the first coating coats at least one surface of the current collector; the second coating coats one surface, far away from the current collector, of the first coating; and the OI value of the second coating is smaller than that of the first coating. Compared with the prior art, the electrode plate has the advantages that in order to ensure the energy density of the battery, the thicker coating layer is divided into the first coating and the second coating for coating respectively, and then the OI value of the second coating is set to be smaller than the OI value of the first coating by regulating and controlling the OI values of the first coating and the second coating, so that the overall OI value of the electrode plate is lower; and the second coating has good dynamic performance and liquid retention and absorption capability, so that the rate charging capability is improved, the cycle life of the battery is prolonged, and the safety of the battery is improved.

The invention relates to the technical field of a lithium battery, particularly a graphite negative electrode structure combination and a preparation method thereof. The graphite negative electrode structure combination comprises a negative electrode structure and a surface modification layer formed on the negative electrode structure; the negative electrode structure comprises a negative electrode current collector and a graphite negative electrode layer formed on the negative electrode current collector; the negative electrode current collector, the graphite negative electrode layer and thesurface modification layer are arranged in an overlaid manner; the graphite negative electrode layer comprises a graphite active material; and the surface modification layer comprises a lithium compound with the ionic conduction characteristic. By taking the surface modification layer as a stable artificial SEI membrane, lithium ion damage in the charging cycle process can be well reduced, the initial charging and discharging coulombic effect is improved, and the specific capacity density of the graphite negative electrode layer is improved; and meanwhile, the surface modification layer can well block macromolecule groups from being nested into the graphite negative electrode layer along with lithium ions, so that stripping of graphite can be avoided, the structural stability of the negative electrode structure can be maintained, and stable conductive performance can be achieved.

The invention relates to a negative electrode for a lithium secondary battery that can ensure a high energy density, a long-life characteristic, and stability by forming a film on a negative electrodefor a lithium secondary battery and thus suppressing dendrites during electrodeposition, a method of manufacturing the same, and a lithium secondary battery using the same. The method of manufacturing the negative electrode for a lithium secondary battery according to the present invention includes preparing a sulfur dioxide-based sodium molten salt and forming a protective layer on the surface of a current collector by immersing the current collector in the sulfur dioxide-based sodium molten salt.

The invention relates to an amorphous nanospherical active ferric phosphate hydrate, and a preparation method and an application thereof. The preparation method of the amorphous nanospherical active ferric phosphate hydrate comprises the following steps: 1, preparing a sustained release agent solution 1; 2, preparing a surfactant solution 2; 3, mixing the sustained release agent solution 1 with the surfactant solution 2 to obtain a solution A; 4, preparing a ferric nitrate nonahydrate solution; 5, dropwise adding the ferric nitrate nonahydrate solution into the solution A to prepare a solution B; 6, adding a phosphoric acid solution into the solution B to prepare a solution C; and 7, transferring the solution C into a polytetrafluoroethylene lined reaction kettle, carrying out a hydrothermal reaction, cooling the obtained reaction product, and carrying out separation and drying to obtain white powder which is the amorphous nanospherical active ferric phosphate hydrate. The method has the advantages of short reaction time, small and uniform product particle sizes, lithium iron phosphate obtained through the lithiation of the ferric phosphate hydrate prepared through the method has large tap density, and a battery product finally obtained through using the hydrate has good high-rate charge and discharge performances.

The invention provides a small airborne laser weapon high-precision light beam control device and control method, belongs to the field of photoelectric tracking aiming of laser weapons, and solves the problems that a traditional photoelectric tracking and pointing system is slow in response, low in precision and weak in high-dynamic tracking capacity, the influence of high-energy laser transmitted in the atmosphere on the laser wave surface cannot be reduced, the energy density is low when the high-energy laser irradiates a target, and the striking effect is reduced. The device comprises a light beam control device and a control method. The light beam control device comprises a fine tracking assembly, a self-adaptive optical assembly, a main laser detector, a reflector and spectroscope assembly and a mounting base station assembly, and the control method comprises the following steps: calibrating a Hartmann detector; carrying out fine tracking on the light spots; carrying out self-adaptive adjustment; and carrying out laser striking. The device and method are mainly used for small airborne laser weapons.

The invention discloses a lithium ion battery structure and an assembly method thereof, and relates to the technical field of lithium ion batteries. Comprising a plurality of roll core assemblies, a connecting piece assembly, a cover plate assembly and an aluminum shell assembly, each roll core assembly comprises a positive lug and a negative lug, each connecting piece assembly comprises a positive connecting piece and a negative connecting piece, bosses and bending stress holes are arranged on the positive connecting pieces and the negative connecting pieces respectively, and a pole is arranged on the cover plate assembly; the connecting sheet assembly and the cover plate assembly are fixed through a boss and a pole, the positive and negative connecting sheets are respectively fixed with the cover plate assembly and are respectively fixed with the positive and negative tabs, and the connecting sheet assembly is bent through a bending stress hole; the multiple roll core assemblies and the connecting piece assemblies are arranged in the aluminum shell assembly together, and the aluminum shell assembly is fixed to the cover plate assembly. The invention provides the lithium ion battery structure and the assembly method thereof, which can solve the problem of short circuit of the battery caused by a large amount of metal dust which is generated when a connecting sheet and a cover plate are welded into a roll core in the prior art, and can improve the energy density of the battery.

The invention discloses a lithium battery core and a manufacturing method. The lithium battery core comprises at least one positive electrode sheet, at least one negative electrode sheet and at least one diaphragm, wherein the positive electrode sheet comprises a positive current collector and a positive electrode active material, the positive current collector comprises a plurality of first small sheets which are parallel at intervals, the adjacent first small sheets are connected by bent blank areas, the positive electrode active material is coated on the side surface of the first small sheet, the negative electrode sheet comprises a negative current collector and a negative electrode active material, the negative current collector comprises a plurality of second small sheets which are parallel at intervals, the adjacent second small sheets are connected by bent blank areas, the diaphragm is bent in an S shape, and the first small sheets and the second small sheets are sequentially and alternately connected to the space formed after the diaphragms are bent and between the adjacent diaphragms, and are connected with the diaphragms. The manufacturing method comprises the steps of inserting, folding and combining. According to the invention, the electrode sheets are fixed, the short-circuit risk of the battery core is reduced, the production efficiency is improved, the lamination qualification rate can be effectively improved, and the production process is effectively simplified.

The invention relates to the technical field of lithium ion batteries, and discloses a composite negative plate and a lithium ion battery comprising the same. According to the composite negative plate disclosed by the invention, the outer layer is made of the negative electrode material with good multiplying power, so that the multiplying power performance of the lithium ion battery can be ensured, the inner layer is made of the negative electrode material with high energy density, so that the energy density of the lithium ion battery can be ensured, and on the other hand, due to the buffering and protecting effects of the outer layer, the cycle performance can also be improved; according to the lithium ion battery assembled by using the composite negative pole piece, the high energy density can be ensured, and meanwhile, the multiplying power and the cycle performance can be obviously improved.

The embodiment of the invention provides a three-lug laminated composite battery, and the battery comprises a positive plate, a negative plate, a diaphragm and electrolyte, wherein the positive and the negative plates are alternately stacked, and the adjacent positive and negative plates are separated by the diaphragm; the positive plates comprise a first positive plate and a second positive plate; the first positive plate comprises a first positive current collector and supercapacitor positive electrode materials arranged on the surfaces of the two sides of the first positive current collector; the second positive plate comprises a second positive current collector and lithium ion battery positive electrode materials arranged on two surfaces of the second positive current collector; the first positive plate is connected with a first positive lug , the second positive plate is connected with a second positive lug, the first positive lug and the second positive lug are mutually independent, and the negative plate is connected with the negative lug. The composite battery has the advantages of a lithium ion battery and a super capacitor, and can avoid a self-discharge effect.

The invention discloses a lithium ion battery pole piece, which comprises a current collector, an active material layer uniformly coated on the current collector and a ceramic coating uniformly coatedon the active material layer, wherein the ceramic coating contains lithium metaaluminate ceramic powders. The invention also discloses a manufacturing method of the lithium ion battery pole piece. The method comprises the following steps: step 1) uniformly coating the active substance material slurry on the current collector, and carrying out drying and rolling to obtain an active substance polepiece; and 2) preparing ceramic slurry from ceramic powders, binders and solvents in parts by mass: 5-50 parts of ceramic powders, 1-5 parts of binders and 30-60 parts of solvent; and then, coating the prepared ceramic slurry on the active substance pole piece obtained in the step 1) and carrying out drying and rolling. According to the lithium ion battery pole piece disclosed by the invention, onthe premise of ensuring energy density and electrochemical performance of a battery, the absorption speed and the liquid retention capacity of the pole piece are improved, and meanwhile, the cycle performance and the safety performance of the lithium ion battery are also improved.

In order to solve the technical problems that a traditional heat dissipation scheme of a battery cabin section of an underwater vehicle is low in heat dissipation efficiency and not obvious in effect, and the temperature of the battery pack cannot be effectively reduced in a short time, the invention provides the high-thermal-conductivity lithium battery pack for the underwater vehicle. According to the invention, the gaps inevitably formed when the cylindrical lithium batteries are arranged are effectively utilized, the gaps are filled with the high-heat-conduction and insulating heat-conduction gap filling material, and heat in the centers of the batteries can be rapidly conducted to the inner wall of the shell of the battery cabin section through the heat-conduction material, so the heat is further conducted to low-temperature seawater outside the battery cabin section, and the purpose of rapid cooling is achieved; the periphery of each cylindrical lithium battery is filled with the heat conduction gap filling material, so that the temperature uniformity can be well ensured; meanwhile, the central gap formed by the cylindrical lithium battery on the innermost ring is reasonably utilized, the central tube is arranged in the central gap, and the central tube is filled with the high-heat-absorption composite material, so heat generated by the battery pack can be quickly and effectively absorbed, and the temperature of the battery pack is reduced.

The invention discloses a hierarchical porous pole piece and a preparation method thereof. Grading coating and pore forming agent addition are utilized to perform grading regulation and control on thepore structure of the pole piece, thereby enhancing the liquid absorption capacity of the pole piece, ensuring the maximization of the active substances, and ensuring the energy density of the battery on the basis of enhancing the electrochemical properties of the pole piece. The pole piece and a lithium piece are assembled into a button cell, it is proved that the material shows excellent electrochemical performance, the electrode polarization can be effectively reduced, and the energy density and the cycling stability of the cell are improved.

The invention discloses a preparation method of polyolefin microporous membrane. The method comprises the following steps that polyolefin resin and a diluent are subjected to fusion and blending in atwin-screw extruder, extrudate is extruded from a die head, through a casting roll, a casting piece is cooled, and then after two-way stretching, extraction and drying are conducted, microporous membrane A is prepared; in the presence of a photosensitizer, a low pressure mercury lamp is used for conducting irradiation on the surface of the microporous membrane A to obtain microporous membrane B; the microporous membrane B is subjected to transverse thermoforming treatment to obtain microporous membrane C; the microporous membrane C is subjected to corona treatment by means of a corona treaterto obtain the polyolefin microporous membrane. After the polyolefin resin is subjected to wet processing, before a rolling procedure, through ultraviolet light irradiation and corona, the polyolefin microporous membrane is subjected to two-time surface treatment, under a condition of not destructing a polyolefin microporous membrane microporous structure, a surface tension coefficient of the microporous membrane is increased, and the polyolefin microporous membrane with a high surface tension coefficient is prepared, so that the safety and the energy density of a lithium battery are improved.

The invention discloses a negative pole piece with a coating layer as well as a preparation method and application of the negative pole piece. The negative pole piece comprises a negative current collector, and a negative material layer and the coating layer which are sequentially positioned on the surface of at least one side of the negative current collector, wherein a negative active substancein the negative material layer comprises a silicon oxide molecular sieve, and the coating layer comprises simethicone and lithium salt. According to the invention, the negative electrode material replaces the use of lithium metal by adopting the silicon oxide molecular sieve, the silicon oxide molecular sieve is a porous silicon material, the negative pole piece material is prepared from the material, and the surface of the negative pole piece material is coated with the coating layer made of a special material, so that the internal resistance can be effectively reduced, and the battery performance is improved. Meanwhile, the positive electrode is prepared from a high-nickel ternary nickel-cobalt-manganese material, so that the performance of the solid-state battery can be further improved, and the high-energy-density all-solid-state battery can be obtained.

The invention discloses a lithium battery structure and an assembly method thereof, and relates to the technical field of lithium ion batteries. Comprising a plurality of roll core assemblies, a cover plate assembly, a connecting piece assembly and an aluminum shell assembly. The roll core assembly comprises a tab, the connecting sheet assembly comprises a boss and a bending stress hole, and the cover plate assembly comprises a pole; the terminal post is provided with a terminal post hole, the connecting piece assembly and the cover plate assembly are fixed through the boss and the terminal post hole in the terminal post, the connecting piece assembly and the tab on the roll core assembly are fixed, and the connecting piece assembly is bent through the bending stress hole; the multiple roll core assemblies and the connecting piece assemblies are arranged in the aluminum shell assembly together, and the aluminum shell assembly is fixed to the cover plate assembly. According to the lithium battery structure and the assembling method thereof, the problem that in the prior art, a large amount of metal dust generated when a connecting piece and a cover plate are welded enters a roll core to cause short circuit of a lithium battery can be solved, and the energy density of the lithium battery can be improved.

The invention discloses a lithium ion battery composite membrane, a preparation method thereof and a lithium ion battery. The lithium ion battery composite membrane comprises a base membrane and a coating layer, and the coating layer is composed of a stripping Boron Nitride nanosheet and P (VDF-HFP) powder. The lithium ion battery composite membrane has the advantage of light weight, the heat conduction has obvious directivity, the expansion of thermal runaway of the lithium ion battery can be prevented when the lithium ion battery composite membrane is applied to the lithium ion battery, the safety of the lithium ion battery is ensured, the preparation process is simple, and industrial production and application are easy.

The invention discloses a flywheel energy storage system rotor comprising a lower rotor shaft, upper rotor shafts, a hub and a spoke. The lower rotor shaft and the plurality of upper rotor shafts areconnected together to form an integrated rotor shaft. The hub is connected to the lower rotor shaft or the upper parts of the upper rotor shafts. Such design uses multiple spirally-connected rotor shafts, and greatly reduces the machining difficulty. Each rotor shaft carries a flywheel block to maintain the energy density. The cooperation of the flywheel block with the segmented rotor avoids a breaking risk under centrifugal force and is beneficial to an increase in rotor speed.

The invention discloses an array type positive electrode current collector for a liquid metal battery. By arranging a columnar array pointing to the direction of a negative electrode at the bottom ofa positive electrode current collector shell, the distribution uniformity of the positive electrode interface of the liquid metal battery is effectively improved, the internal stress of an interface alloy layer is reduced, more attachment sites are provided for the alloy layer, and the short-circuit risk in the operation process of a large-size battery is effectively eliminated, at the same time,the mass transfer process of the battery charging and discharging process can be effectively ensured, and the safe, stable and efficient battery operation is promoted.