2996 results about "Solid-state battery" patented technology

The invention relates to a composite solid electrolyte membrane with high ceramic content and a preparation method and application thereof. The preparation method comprises the following steps: mixing ceramic solid electrolyte particles activated by a silane coupling agent with an in-situ polymerization solution containing a cross-linking agent, an organic monomer, a plasticizer, a lithium salt, an ultraviolet light initiator and a thermal initiator to form solid electrolyte slurry, wherein the ceramic solid electrolyte particles account for 60-90% of the total mass of the composite solid electrolyte membrane; the preparation method comprises the following steps: coating a positive pole piece with solid electrolyte slurry, initiating shallow organic matter monomers and a cross-linking agent to generate in-situ polymerization through an ultraviolet light initiator, covering a negative pole piece for hot pressing treatment, initiating residual organic matter monomers and the cross-linking agent to generate in-situ polymerization through a thermal initiator, and forming a composite electrolyte membrane with high ceramic content. The invention also discloses an all-solid-state battery containing the composite solid electrolyte membrane. The solid-state battery containing the in-situ formed composite solid-state electrolyte membrane has relatively high cycling stability.

The invention provides a solid electrolyte slurry, an electrode slurry, a solid electrolyte sheet, an electrode sheet, a solid battery monomer, a battery device and a power utilization device.The solid electrolyte slurry comprises a sulfide solid electrolyte material, a solvent and a binder dissolved in the solvent, and the solvent is a non-polar solvent, a weak-polar solvent or a mixed solvent of the non-polar solvent and the weak-polar solvent; the binding agent comprises a polyacrylate binding agent and a non-polar polyolefin binding agent. The slurry disclosed by the invention has high dispersity, high suspension property and good cohesiveness, and can enable the solid-state battery monomer to have high initial coulombic efficiency when being used in the solid-state battery monomer.

The invention discloses a negative electrode interface modification material, a negative electrode plate, a positive electrode interface functional layer, a positive electrode plate, a solid-state battery and a power utilization device, and relates to the technical field of batteries, the negative electrode interface modification material comprises a first polymer matrix, a reinforcing filler, a conductive agent and a lithium salt, the modulus of the reinforcing filler is greater than 50 GPa. The tensile strength of the negative electrode interface modification material can be improved through the first polymer matrix, breakage of a negative electrode interface modification layer is reduced, interface impedance is reduced, meanwhile, the first polymer matrix can be matched with the expansion coefficient of a silicon-based material, and bulging of a negative electrode plate is reduced. The modulus of the reinforcing filler is greater than 50GPa, so that the modulus of the negative electrode interface modification layer can be improved, the expansion of the silicon-based active material is further inhibited, the conductive agent can relieve the problem that the flexible substrate interface of the copper foil and the negative electrode interface modification layer possibly causes unsmooth electron transmission, and the lithium salt can improve the ion conduction capability and reduce the interface impedance.

The invention discloses a high-interface-stability composite solid electrolyte membrane as well as a preparation method and application thereof. The composite solid electrolyte membrane comprises a gradient aperture three-dimensional porous skeleton formed by sintering inorganic solid electrolyte particles, a polymer electrolyte filled in a pore channel, and a plastic interface stable layer positioned between the electrolyte membrane and an electrode. The preparation method comprises the following steps: preparing a gradient aperture porous framework through a pore-forming agent template method and a tape casting technology, dipping and filling a polymer electrolyte precursor solution in a solution, accelerating in-situ polymerization by adopting electric induction, and performing hot-pressing treatment. The composite solid-state electrolyte membrane has high ionic conductivity, excellent interface compatibility and high mechanical strength, can effectively inhibit the growth of lithium dendrites, can be applied to solid-state batteries such as lithium metal batteries, lithium sulfur batteries and lithium air batteries, and can remarkably prolong the cycle life and improve the safety performance of the batteries, and the preparation process is suitable for large-scale production.

The invention belongs to the technical field of solid-state batteries, and provides a lithium-sulfur-phosphorus-chlorine-bromine solid-state electrolyte, a preparation method thereof and an all-solid-state battery. The preparation method comprises the following steps: mixing lithium sulfide and phosphorus sulfide, and carrying out ball milling to obtain a lithium-sulfur-phosphorus ternary mixture; in protective gas, the lithium-sulfur-phosphorus ternary mixture, lithium chloride and lithium bromide are mixed and then subjected to ball milling, and a lithium-sulfur-phosphorus-chlorine-bromine mixture is obtained; and carrying out heat treatment on the lithium-sulfur-phosphorus-chlorine-bromine mixture in protective gas to obtain the lithium-sulfur-phosphorus-chlorine-bromine solid electrolyte. The lithium-sulfur-phosphorus-chlorine-bromine solid electrolyte provided by the invention not only improves the electrochemical stability, but also maintains the high ionic conductivity characteristic.

The invention discloses a mixed ion conductor layer for a lithium metal negative electrode, a preparation method of the mixed ion conductor layer and an all-solid-state battery, and belongs to the technical field of sulfide all-solid-state batteries. The preparation method comprises the following steps: synthesizing a sulfide electrolyte 70 (0.75 Li2S-0.25 P2S5)-30LiI through a liquid phase, introducing graphene oxide and a lithium salt precursor 2, 5-dihydroxy-1, 4-benzene diphosphate in the electrolyte preparation process, and carrying out heat treatment and pressing to obtain a mixed ion conductor layer; the graphene oxide can isolate the sulfide electrolyte layer from the lithium metal negative electrode, interface reaction is avoided, and a special porous and interlayer structure provides a transverse growth space for lithium metal deposition. And meanwhile, the lithium diphosphate-based MOF among the graphene layers ensures the rapid movement of lithium ions, enhances the bulk diffusion of lithium at the negative electrode end, reduces the local current density, plays a role in dredging the distribution of the lithium ions, and remarkably prolongs the cycle life of the sulfide all-solid-state battery.

The invention provides a solid-state battery and a preparation method thereof, and particularly relates to the technical field of solid-state batteries. The solid-state battery is composed of a plurality of laminated units, the laminated unit comprises a positive pole piece, an all-solid-state electrolyte membrane and a negative pole piece which are sequentially stacked according to a sandwich structure; among the positive pole piece, the all-solid-state electrolyte membrane and the negative pole piece, convex structures and concave structures which are uniformly arranged are distributed on any two mutually contacted surfaces of the positive pole piece, the all-solid-state electrolyte membrane and the negative pole piece. When the components of the solid-state battery are overlapped, the convex structures and the concave structures on the surfaces of the solid-state battery can be mutually engaged to form a stable micro-embedded structure, the interface bonding strength between the positive electrode and the electrolyte and between the negative electrode and the electrolyte is greatly enhanced through physical embedding, and the problem of unstable bonding in the prior art is solved. Meanwhile, the uniform concave-convex structure ensures the controllability and consistency of the interface contact area, effectively reduces and stabilizes the interface impedance, improves the performance consistency of the pole piece, and further improves the production yield and the overall performance stability of the battery.

The invention relates to a doped modified argyrodite type solid electrolyte and a preparation method thereof, and belongs to the technical field of all-solid-state battery materials. The chemical formula of the electrolyte is Li < 5.5 + 2x + 2y > P < 1-x-y > Y < x > Bi < y > S < 4.5-1.5 x-1.5 y > O < 1.5 x + 1.5 y > Cl < 1.5 >, x is greater than or equal to 0.01 and less than or equal to 0.04, and y is greater than or equal to 0.01 and less than or equal to 0.04; the yttrium element and the bismuth element are doped at the P site of the argyrodite type electrolyte, and the oxygen element is doped at the S site of the argyrodite type electrolyte. After the argyrodite type electrolyte is in contact with metal lithium, an interface protection layer rich in lithium oxide can be formed in situ at an interface in a circulating process, so that lithium can be uniformly deposited, the generation of interface side reaction is inhibited, the interface stability of the argyrodite type electrolyte to a lithium metal negative electrode is improved, and the polarization voltage of a symmetrical battery is reduced; and the cycling stability of the all-solid-state lithium metal battery is enhanced.

The invention discloses a composite sulfide solid-state electrolyte and a preparation method and application thereof, and relates to the technical field of solid-state batteries. The composite sulfide solid electrolyte comprises sulfide solid electrolyte particles and nano ion conductor particles which are stable to water vapor, wherein the nano ion conductor particles are uniformly distributed on the surfaces and gaps of the sulfide solid electrolyte particles to form a composite structure. Therefore, through the composite structure that the nano ion conductor particles are uniformly distributed on the surfaces of the sulfide particles and in the gaps, the surface coverage of the sulfide solid electrolyte can be increased, the hydrolysis reaction rate can be reduced, and the sulfide solid electrolyte is well protected while the reduction amplitude of the lithium ion conductivity is reduced; the stability to air is improved; and the electrochemical stability is also improved. In addition, the method is simple in process, has good mass production capacity, and has high application value for actual production.

The invention belongs to the technical field of new energy materials, and particularly relates to siloxane crosslinking modified polyether solid electrolyte and a preparation method thereof. According to the solid electrolyte, the electrophilic ring-opening polymerization reaction of a polymer monomer with an epoxy group is utilized, siloxane is used as a cross-linking agent, polyether chain structures are connected together to form a cross-linked network structure, the ionic conductivity can be increased, and the mechanical strength and the high-temperature dimensional stability can be improved; the lithium ion transference number is increased, the polarization is reduced, and the battery rate capability is improved; the oxidation stability of the electrolyte is improved; the decomposition reaction of polyether at high temperature is inhibited; the thermal stability and the flame retardant property of the polymer electrolyte are remarkably improved, so that the safety of a solid-state battery is improved.

The utility model provides an all-solid-state battery capable of preventing short circuit, and belongs to the technical field of all-solid-state batteries. The all-solid-state battery comprises a solid electrolyte layer, positive plates and negative plates, the positive plates and the negative plates are alternately stacked, the solid electrolyte layer is arranged between the positive plates and the negative plates, an insulating frame layer is further arranged between the positive plates and the negative plates, and the insulating frame layer is of a hollow quadrilateral frame structure. The inner frame is smaller than the positive plate, and the outer frame is larger than the positive plate. The lithium ion battery can prevent the structural integrity of the electrolyte layer from being damaged by the shearing effect generated by the edge of the pole piece under high voltage, so that the battery is short-circuited due to contact of the positive and negative pole pieces, the yield of the lithium ion battery is obviously improved, the short-circuit rate of the battery is reduced, and the cycle performance of the battery is improved.

The utility model discloses a solid-state battery testing device with a balanced pressurization function. The solid-state battery testing device is used for improving the precision of stacking pressure and the electrochemical performance of a solid-state battery during testing of the solid-state battery. The die comprises an upper cover plate, an upper base plate, an upper pole column plate, an upper pole column, a sealing washer, a pressure stud, a pressure stabilizing column, an upper die shell, a lining, a lower die shell, a solid-state battery, a lower pole column, a lower pole column plate, a pressure sensor, a lower base plate and a lower cover plate. The plurality of voltage stabilizing columns with the same height are uniformly arranged on the upper pole column plate, and the plurality of pressure sensors are correspondingly and uniformly arranged on the lower pole column plate, so that uniform stress in the plane of the solid-state battery in the testing process is ensured, and the performance and the data repeatability of the solid-state battery are improved. In addition, the change condition of the plane internal stress of the solid-state battery can be known according to real-time pressure data. The solid-state battery performance testing device is suitable for performance testing of various solid-state batteries, and has a wide application prospect in solid-state battery research.

A method for synergistically preparing lithium sulfide by vacuum molten salt based on hydrogen sulfide-lithium salt reaction belongs to the technical field of battery materials, and comprises the following steps: placing a lithium salt solid in a reactor, introducing a molten salt medium on the surface of the lithium salt or in a reaction system, introducing purified hydrogen sulfide gas under a vacuum auxiliary condition, controlling the reaction temperature to be 200-500 DEG C, and reacting for 1-2 hours; and adjusting the flow rate of hydrogen sulfide to be 50-1000mL / min and the retention time to be 5-180min, continuously exhausting gas to discharge water vapor in the reaction process, stopping introducing hydrogen sulfide gas after the reaction is finished, cooling the system to room temperature under the protection of inert gas, taking out the product, washing to remove residual fused salt, and carrying out vacuum drying to obtain the high-purity lithium sulfide. The prepared lithium sulfide has high purity (greater than or equal to 99.90%), low defect density and an excellent crystal structure, and can be widely applied to lithium-sulfur batteries, all-solid-state batteries and novel energy storage technologies, so that the energy density is improved, the cycle life is prolonged, and the energy consumption is reduced.

The invention relates to a solid-state battery positive electrode material layer and a solid-state battery, belongs to the technical field of solid-state batteries, and is used for solving at least one of the problems that an existing solid-state battery is easy to crack, poor in contact and large in resistance, and a solid-state electrolyte battery prepared by a physical vapor deposition method is thin in electrode thickness, low in capacity and the like. A plurality of holes are formed in the positive electrode material layer, the diameter of each hole is 0.1-10 [mu] m, the opening area of each hole in the unit area of the positive electrode material layer accounts for 20-60% of the total area, and each hole is of a through hole structure. The positive electrode material layer of the solid-state battery is provided with a plurality of holes with through hole structures, the solid electrolyte is embedded into the holes, the holes are filled with the solid electrolyte, the solid electrolyte covers the positive electrode material layer, and the holes have specific diameters and opening areas, so that the ionic conductivity is improved, and the service life of the solid-state battery is prolonged. The thickness of the prepared positive electrode material layer can be designed as required.

The invention provides a positive electrode active material and a preparation method thereof, a positive electrode and a solid-state battery, and particularly relates to the technical field of solid-state batteries. The positive electrode active material has a core-shell structure, and the core-shell structure comprises a core layer and a coating layer coating the core layer; the core layer is made of a lithium-rich manganese-based material; and the coating layer is made of a fast ion conductor and a halide solid electrolyte. The fast ion conductor in the coating layer of the positive electrode active material can improve the ionic conductivity of the surface layer of the positive electrode active material, promote rapid migration of lithium ions and assist in improving the initial coulombic efficiency. Meanwhile, the coating layer improves the chemical stability of the positive electrode active material, effectively inhibits the interface side reaction between the positive electrode body and the sulfide electrolyte, and relieves the structural degradation in the cycle process. The coating layer can also be used as a buffer layer to inhibit stress generated by volume shrinkage and expansion in charge and discharge cycles, maintain good contact of an electrode interface, and realize improvement of the electrochemical performance of the material.

The invention discloses a low-porosity and low-impedance dry positive electrode of a solid-state battery and a preparation method of the low-porosity and low-impedance dry positive electrode. The dry positive electrode of the solid-state battery comprises a large-particle positive electrode active material, a small-particle positive electrode active material, a first conductive agent, a second conductive agent, a third conductive agent, a small-size sulfide solid electrolyte, a large-size sulfide solid electrolyte and a binder. All the components are mixed in a manner of size matching and step-by-step embedding. Size matching among multi-stage particles is introduced, so that the size of gaps among different components is reduced, and the porosity is reduced; the binding agent and part of the conductive agent are premixed to form a'binding-conductive double network ', and then the active material and the electrolyte are gradually embedded, so that the purpose of low impedance of the composite positive electrode is achieved. And finally, the rate capability and the cycling stability of the solid-state battery are improved.

The invention discloses a solid-state battery, an electrode layer, a battery cell, a single battery and electric equipment, the solid-state battery is composed of a solid-state positive pole piece, a solid-state electrolyte layer and a solid-state negative pole piece, the edges (at least one pole piece) of the positive pole piece and the negative pole piece contain an insulating coating, and the solid-state electrolyte layer can contain or does not contain the insulating coating; the short-circuit risk of the solid-state battery due to dislocation of positive and negative plates is solved, the problems of powder falling and material falling at the edges of positive and negative electrodes and electrolyte of the solid-state battery can be solved, particles are prevented from entering the battery, and the safety is further improved.

The invention provides a silicon-based material and a preparation method thereof, a negative pole piece and a solid-state battery. The silicon-based material comprises an inner core and a surface coating layer, the inner core comprises a silicon-based negative electrode material, the surface coating layer is a carbon fluoride layer, the carbon fluoride layer internally comprises Li-M, LiF and LiX, M represents a metal element and is selected from at least one of Ag, Mg, Zn and Al, and X represents a non-metal element and is selected from at least one of N, S and P. The silicon-based negative electrode material is used as a core, the surface of the silicon-based negative electrode material is coated with the carbon fluoride layer, and the Li-M alloy / LiF / LiX composite lithium compound is introduced into the carbon fluoride layer, so that triple effects of ion-electron double-conduction network construction, interface chemical stabilization and mechanical buffer enhancement are achieved; and the chemical stability of an interface between the silicon negative electrode and sulfide solid electrolyte is improved while the rate capability of the negative electrode is improved and the expansion and shrinkage of the silicon negative electrode are relieved, and the cycling stability is improved.

The invention relates to the technical field of solid-state lithium ion batteries, in particular to a composite solid-state electrolyte diaphragm, a preparation method and an all-solid-state battery. According to the invention, a 3D ion / electron channel is constructed through a cellulose skeleton, an oxide electrolyte nanowire directional arrangement technology is adopted, and an in-situ interface lithium fluoride repairing layer is adopted, so that the industrialization bottleneck that high ion conduction-mechanical strength-interface stability is difficult to collaboratively optimize in the prior art is broken through; the common problems of insufficient bulk phase and interface ion conductivity, poor mechanical strength, poor compatibility with a high-nickel positive electrode / silicon carbon negative electrode and the like of a solid-state battery are effectively solved. The mass energy density of the prepared all-solid-state battery can reach 360 Wh / kg, the capacity retention ratio can still be maintained at 80% or above after 1100 times of circulation, and the all-solid-state battery successfully passes 190 DEG C thermal runaway and acupuncture tests and shows excellent safety performance and wide industrial application prospects.

The invention belongs to the technical field of lithium ion battery positive electrode material preparation, and relates to a manganese-based positive electrode of an all-solid-state battery system, a preparation method and application of the manganese-based positive electrode, the general formula of the manganese-based positive electrode is Li < 1 + x > NiyCoyMn3yOz, the preparation method comprises the following steps: S1, grinding and mixing a lithium-rich manganese original material and lithium phosphate in an inert gas protective atmosphere to obtain a precursor mixture; s2, performing high-energy mechanical ball milling on the precursor mixture; s3, collecting the powder subjected to high-energy mechanical ball milling in an inert gas protective atmosphere to obtain a manganese-based positive electrode material; the manganese-based positive electrode material disclosed by the invention realizes mixed arrangement of part of cations and a double-phase synergistic heterostructure, and has high energy density and voltage, and a halide and sulfide-based all-solid-state battery assembled by using the manganese-based positive electrode material shows good cycling stability and rate capability.

The invention discloses a composite positive electrode, a preparation method thereof and an all-solid-state battery. The composite positive electrode comprises a composite solid electrolyte and a positive electrode active material. The composite solid electrolyte comprises a first solid electrolyte and a second solid electrolyte, wherein the molecular structural formula of the first solid electrolyte is Li < 2 + > (4-a) < x > Zr < 1-x > A < x > Cl < 6-by > By; the second solid electrolyte is selected from one or more of sulfide solid electrolytes; the selection of the metal element A and the non-metal element B meets the condition that XIC * x + (1-x) * 1.687 is less than 1.6; and [(6-by) * 3.16 + y * Xp] / [(6-by + y) * (XIC * x + (1-x) * 1.687)] > = 1.9; wherein the valence state of the metal element A is + a, and the valence state of the non-metal element B is-b; xIC represents the electronegativity of the metal element A, and Xp represents the electronegativity of the non-metal element B. According to the invention, the material forming the composite positive electrode is selected based on the electronegativity of the contained elements, so that the stability and the electrical performance are improved.

The present application provides an in-situ polymerized solid-state electrolyte, a method for preparing a solid-state electrolyte by means of in-situ polymerization, a solid-state battery, a method for preparing a solid-state battery, and an electric device. The in-situ polymerized solid-state electrolyte comprises a room-temperature initiator, a high-temperature initiator, a cyclic monomer polymer, and an electrolyte salt. The room-temperature initiator can exert a function in a standing period after a battery is filled with an electrolyte, to achieve electrode sheet wetting by the electrolyte and implement room temperature prepolymerization of a precursor solution, thereby improving the uniformity of the precursor solution contained in each part in the battery, and avoiding solid-liquid demixing in the precursor solution. In addition, the high-temperature initiator can improve the degree of curing of the whole electrolyte and improve the ion transport efficiency and safety of the solid-state electrolyte. The joint action of the room-temperature initiator and the high-temperature initiator comprehensively improves the uniformity of the in-situ polymerized solid-state electrolyte, and improves the quality stability of the solid-state.

The invention discloses a multilayer composite solid electrolyte membrane, a preparation method and a prepared solid-state battery, the multilayer composite solid electrolyte membrane sequentially comprises a three-dimensional polymer networked solid electrolyte, a LiPON layer and a polydopamine layer, the thickness of the three-dimensional polymer networked solid electrolyte is 20-40 [mu] m, and the thickness of the polydopamine layer is less than 100 nm. By adopting the synergistic effect of the silane coupling agent modified LLZO and the degraded chitosan, a better ion transmission coordination effect can be provided, and the efficiency of an ion channel is improved. The dendritic crystal inhibition efficiency is improved, obvious cracks are avoided after 1000 times of circulation, the composite material is applied to a solid-state battery, the cycle life of the battery is prolonged, and the capacity retention rate is 95% after 1000 times of circulation. The mechanical toughness of the solid electrolyte is improved, and the elongation at break can reach 130%. A water-phase solvent is used in the whole preparation process, use of an organic solvent is avoided, energy consumption is reduced by 40%, no VOC is discharged in the whole process, and the method is green, safe and environmentally friendly.

The invention provides a solid electrolyte membrane, a preparation method thereof and a solid-state battery. The solid electrolyte membrane comprises an inorganic filler, a polymer matrix and a lithium salt, wherein the inorganic filler comprises a dielectric conductive ion material and oxide particles; wherein the dielectric conductive ion material comprises a dielectric filler and a silane coupling agent which is coated on the outer surface of the dielectric filler and contains cyano groups, the dielectric filler contains transition metal elements, and the transition metal elements are Nb elements and / or Ta elements; the oxide particles comprise lanthanum oxide particles; the mass ratio of the dielectric conductive ion material to the oxide particles is (1-5): 1, and the ratio of the total mass of the inorganic filler to the mass of the polymer matrix is (10-50): 100. The solid electrolyte membrane provided by the invention has relatively high ionic conductivity, mechanical strength and structural stability, and can effectively improve the comprehensive performance of the solid lithium metal battery.

The invention belongs to the technical field of all-solid-state lithium batteries, and particularly relates to a densified sulfide all-solid-state battery composite positive electrode material and a preparation method and application thereof. The preparation method of the composite positive electrode material comprises the following steps: (1) raw material pretreatment: mixing a positive electrode active substance, a sulfide solid electrolyte and an additive according to a predetermined mass ratio under the protection of an inert atmosphere, and carrying out mechanical grinding to obtain composite positive electrode powder; the additive is Li3PO4 (lithium phosphate); (2) isostatic pressing pretreatment: performing hot isostatic pressing treatment on the composite positive electrode powder, and then controlling the cooling rate to cool to room temperature to obtain a densified composite positive electrode blank; (3) adding a conductive agent and a binder into the densified composite positive electrode blank, and mixing; the composite positive electrode material is obtained; the binder is formed by compounding nano-scale polytetrafluoroethylene and micron-scale polytetrafluoroethylene according to a mass ratio of 1: 2-1: 4.

The utility model provides an all-solid-state battery capable of preventing short circuit, and belongs to the technical field of all-solid-state batteries. The all-solid-state battery comprises a solid electrolyte layer, a positive electrode and a negative electrode, the positive electrode and the negative electrode are alternately stacked, the solid electrolyte layer is arranged between the positive electrode and the negative electrode, an insulating layer is arranged on a positive electrode current collector on the side where a tab is located and on the periphery of a positive electrode material area on the opposite side, and insulating tapes are pasted on the upper and lower sides of the positive electrode without the insulating layer. According to the utility model, the gluing ion / electronic insulating layers are arranged at the peripheries of the lugs and the opposite sides of the lugs in the positive electrode material area, and the insulating tapes are adhered to the upper and lower surfaces of the two sides of the positive electrode without the insulating layers, so that short circuit caused by shearing of the edges of the positive and negative electrode pieces under high voltage can be effectively prevented, and the safety and the reliability of the battery are improved.

The invention discloses a thermal management control method and device of a solid-state battery, a vehicle and a computer readable storage medium. The solid-state battery is internally provided with a phase change material; the method comprises the following steps: monitoring the state change of the phase change material in real time; predicting thermal load distribution of the solid-state battery by adopting a dynamic thermal load estimation algorithm based on the state change of the phase change material, and generating a prediction result; according to the dynamic thermal load estimation algorithm, thermal load distribution in the solid-state battery is calculated in real time by establishing a coupling relationship between a phase change material state change parameter and a heat conduction equation; and generating a self-adaptive control strategy based on the prediction result of the thermal load distribution so as to adjust the operation parameters of the thermal management system. By applying the technical scheme of the invention, the problems that the thermal management system cannot accurately sense the internal thermal state of the battery, response lags behind, the prediction capability is lacked and full life cycle optimization cannot be realized can be solved.

The embodiment of the invention discloses a positive electrode of an all-solid-state battery, a preparation method and the all-solid-state battery. The positive electrode of the all-solid-state battery comprises a positive electrode layer and solid electrolyte particles, wherein the positive electrode layer is provided with a through hole; the through hole is filled with the solid electrolyte particles; and the through hole penetrates through the positive electrode layer in the thickness direction of the positive electrode layer. Through the embodiment of the invention, a solid electrolyte high-speed passage can be constructed, and after the positive electrode, the solid electrolyte layer and other parts are assembled to form the all-solid-state battery, lithium ions in the positive electrode can be quickly embedded into or separated from the positive electrode layer through the solid electrolyte high-speed passage, so that the concentration polarization of the all-solid-state battery is greatly reduced; the content of solid electrolyte in the positive electrode layer can be reduced, and the proportion of active substances in the positive electrode layer can be increased, so that the problem that the energy density and the rate capability cannot be simultaneously realized due to the increase of the thickness of the positive electrode layer is solved.

The invention provides a composite electrode for a solid-state battery, a preparation method of the composite electrode, a battery cell for the solid-state battery and the solid-state battery, and particularly relates to the technical field of solid-state batteries. The composite electrode for the solid-state battery comprises a current collector; the active material layer is arranged on at least one side surface of the current collector; the solid electrolyte layer is arranged on the surface of one side, far away from the current collector, of the outer side of the active material layer; the solid electrolyte layer extends outwards in the circumferential direction of the active material layer so as to form a coating structure around the active material layer; and the solid electrolyte layer at the coating structure is in direct contact with the current collector. According to the composite electrode, a solid electrolyte layer structure with edge supporting and insulating effects is formed around the active material layer, so that direct contact between the active material and the edge of the current collector is avoided, and local short circuit is prevented. In addition, the extended solid electrolyte layer can also be used as a physical barrier, so that side reaction of an electrode interface is reduced, the cycle life of the battery is remarkably prolonged, and the safety performance of the battery is remarkably improved.