10results about How to "Avoid structural collapse" patented technology

A battery pack according to one embodiment of the present invention includes: one or more battery modules; a housing for accommodating the battery modules; and an upper heat sink disposed above the battery modules on the upper part of the housing. The battery pack according to one embodiment of the present invention has the following effects: if the battery modules within the battery pack experience excessive temperature rise or fire, it delays the rate of heat transfer, controls the temperature of the battery pack leads, and prevents structural collapse of the upper part of the battery pack.

The invention provides a preparation method of an anti-yellowing thermoplastic polyurethane material, which comprises the following steps: aliphatic thermoplastic polyurethane particles are provided, and polymerization raw materials of the particles comprise hexamethylene diisocyanate, polyether polyol and a chain extender; placing the particles in an environment with a temperature of 80-90 DEG C, and heating for 12-24 hours to obtain pre-crosslinked particles with a gel content of 5-15 wt%; the pre-crosslinked particles are placed in a high-pressure closed environment, supercritical fluid is introduced, and the temperature of 113 DEG C to 117 DEG C and the pressure of 20 MPa to 24 MPa are maintained for 60 minutes to 90 minutes; reducing the temperature of the high-pressure closed environment from 113 DEG C to 117 DEG C to 100 DEG C to 105 DEG C under the condition that the pressure of the high-pressure closed environment is kept at 20 MPa to 24 MPa, and keeping the temperature of 100 DEG C to 105 DEG C for 10 minutes to 15 minutes; and releasing the pressure of the high-pressure closed environment to 0.09 MPa to 0.11 MPa at the temperature of 100 DEG C to 105 DEG C. According to the thermoplastic polyurethane material prepared by the preparation method, the yellowing problem is solved, and the thermoplastic polyurethane material has good structural stability and dimensional stability.

The invention provides an anti-clogging composite drainage network and a preparation method thereof, and relates to the technical field of drainage networks. Comprising a net core and geotechnical cloth fixedly arranged on the two sides of the net core, the net core sequentially comprises an inner core and an outer core from inside to outside, the inner core is glass fiber reinforced HDPE, and the outer core is a polyurea coating; the geotechnical cloth is PP + ES geotechnical cloth. The problems that a net core is poor in compression resistance, low in hydraulic conductivity and low in transverse stretching, and geotechnical cloth is poor in acid and alkali resistance are solved.

The invention discloses high-specific-surface-area porous carbon based on coal gasification carbon residues and a preparation method and application thereof.The method comprises the steps that coal gasification residues serve as raw materials and are treated to obtain a carbon-rich precursor, and the carbon-rich precursor is carbonized to obtain a coal gasification residue-based hard carbon matrix; then, the hard carbon matrix is in contact with a modified solution containing hydrogen peroxide, synergistic pore-forming agents such as an inorganic gas generating type pore-forming agent, an organic small molecule pore-forming agent and a soft and hard template pore-forming agent can be further added into the modified solution, and selective oxidation etching and gas-phase pore-forming are carried out under the conditions of controlled temperature, time and pH; a multi-scale micropore and mesopore structure is formed; and washing, drying and re-carbonizing or thermally annealing to obtain the coal gasification slag-based hard carbon material with high specific surface area. Compared with unmodified hard carbon, the method has the advantages that the specific surface area can be obviously increased, micropores and mesopores are synergistically developed, electrolyte infiltration and an ion transmission channel are obviously improved, and controllable construction of a multistage pore channel can be realized on the premise of ensuring relatively high yield and structural stability.

This application relates to the field of sodium-ion batteries, specifically to an outdoor low-temperature sodium-ion battery and its preparation method. The preparation method of the positive electrode active material of this sodium-ion battery is as follows: Preparation of a mixed solution: soluble salts of nickel, manganese, and niobium are dissolved and mixed to obtain a mixed solution; Co-precipitation: under an inert atmosphere, the mixed solution is mixed with a precipitant and heated for co-precipitation, then filtered and dried to obtain a precursor; Mixed calcination: the precursor, sodium source, and acetylene black are mixed, pre-sintered at 450-550℃, then sintered at 850-900℃, and after crushing and grinding, the positive electrode active material is obtained; the sodium source includes at least one of sodium carbonate and sodium acetate. This application uses a nickel-manganese-niobium ternary metal synergistic preparation of the positive electrode active material, utilizing pre-sintering and high-temperature sintering to form a stable O3-type layered oxide structure, in which the tightly packed oxygen atom layers are Na. + It provides continuous diffusion channels, and the paths are not easily blocked by lattice contraction at low temperatures.

The present application relates to the field of preparation of bio-based multi-level pore carbon material and environmental governance, in particular to a kind of bio-based three-dimensional multi-level pore carbon material and its preparation method and application.The preparation method of bio-based three-dimensional multi-level pore carbon material of the present application includes the following steps: biomass raw material and phenol, composite acid catalyst are mixed and reacted 1, to obtain bio-based liquefied material;Bio-based liquefied material is mixed with composite base catalyst and polyformaldehyde, and then reacted 2, to obtain bio-based liquefied resin;Bio-based liquefied resin is mixed with surfactant, foaming agent, metal-based DES and curing agent, and then foamed, to obtain carbonization precursor;The carbonization precursor is subjected to carbonization treatment, and then ultrasonic water washing is carried out, to obtain bio-based three-dimensional multi-level pore carbon material.The bio-based three-dimensional multi-level pore carbon material prepared by the method of the present application has uniform structure, contains micron-nanometer multi-level pore structure, and has high adsorption performance.

This utility model provides a hydraulic engineering foundation pile, mainly relating to the field of hydraulic foundation pile structures. A hydraulic engineering foundation pile includes a pile barrel, with concrete injection baffles fixedly arranged around its interior. Concrete inlets are opened around the bottom of the pile barrel at positions corresponding to the concrete injection baffles. A concrete box is fixedly arranged on the outside of the pile barrel at positions corresponding to the concrete inlets. Concrete baffles are slidably connected to the inside of each concrete injection baffle, and a lifting base plate is fixedly arranged at the bottom of each concrete baffle. The beneficial effects of this utility model are: improving the stability of the foundation pile and providing support around the pile barrel to prevent structural collapse.

The application relates to the technical field of biomaterials, and discloses a high-biocompatibility hydrogel based on enzyme catalysis cross-linking and a preparation method thereof, which comprises the following steps: mixing a polypeptide mother liquor containing a tyrosine residue, functional nanoparticle tyrosinase and an MES buffer solution to obtain precursor solution A; mixing gelatin, recombinant elastin and a phosphate buffered saline solution to obtain a polymer mother liquor, and adding microbial transglutaminase into the polymer mother liquor to obtain precursor solution B; and mixing and reacting the precursor solution A and the precursor solution B to obtain the high-biocompatibility hydrogel based on enzyme catalysis cross-linking. In the application, the interpenetrating network constructed by the tyrosinase and the microbial transglutaminase sequentially catalyzes a significant synergistic enhancement effect. In a hyperglycemic environment, a mesoporous silica nanoparticle built-in level connection system is automatically activated, realizing multiple effects of antibiosis, anti-inflammation and promotion of angiogenesis.

This invention discloses a method for preparing electrode slurry for high-rate lithium batteries and its coating process, belonging to the field of lithium battery technology. Using chitosan as a carbon source, modified titanium carbide nanosheets are composited with nickel-cobalt-doped silicon spheres via glutaraldehyde crosslinking. High-temperature carbonization forms a carbon coating. The carbon-coated composite porous microspheres are then mixed with nano-copper powder, conductive carbon black, and sodium carboxymethyl cellulose solution, and subjected to gradient stirring to obtain the electrode slurry for high-rate lithium batteries. This invention utilizes the synergistic effect of metal-doped porous silicon spheres and modified titanium carbide nanosheets with carbon coating to construct a conductive network, allowing metal ions to be uniformly anchored on the surface and within the pores of the silicon spheres. This improves the conductivity of the silicon-based material and alleviates particle pulverization caused by silicon volume expansion. The carbon coating forms a "core-shell" structure, achieving high conductivity and high rate capability in the electrode slurry.

This invention provides a method for purifying hydrogen peroxide based on an ultra-clean, high-purity hydrogen peroxide preparation system, comprising the following steps: Industrial-grade hydrogen peroxide feedstock is pumped to a front-end precision filter via a first pressurized pump for filtration, and the feedstock is collected in a first storage tank; it is then pumped to a first cooling heat exchanger via a second pressurized pump for heat exchange, and subsequently passed through a first-stage reverse osmosis module for separation, with the desalinated water collected in a second storage tank, and a portion of the concentrate returned to the first storage tank, while the remaining portion is passed through a concentrate reverse osmosis module for separation; the desalinated water produced by the concentrate reverse osmosis module is returned to the first storage tank; the feedstock in the second storage tank is subjected to heat exchange, and then passed through a second-stage reverse osmosis module for separation, with the desalinated water collected in a third storage tank, and the concentrate returned to the first tank; the feedstock in the third storage tank undergoes ion exchange and adsorption treatment, followed by filtration to obtain ultra-clean, high-purity hydrogen peroxide. This invention achieves safe, continuous, and efficient purification of hydrogen peroxide under ambient temperature and pressure conditions.