132results about How to "Improved thermal management" patented technology

The invention provides a multifunctional controller for a new energy automobile and the new energy automobile, and relates to the technical field of new energy automobile control. The multifunctional controller for the new energy automobile comprises a data collection module, a data processing module, a prediction module, a storage system, a communication system, a user interface, a software system, a battery management system, an auxiliary driving system, a safety system, an emotion recognition module, a power supply system and a continuous learning system. Through the prediction model and time sequence analysis, the charging and discharging strategy of the battery is optimized, the service life of the battery is prolonged, the energy efficiency is improved, a power system is optimized according to real-time data and a prediction result, the performance and efficiency of the vehicle are improved, and thermal management of the vehicle is optimized according to weather forecast and real-time traffic information. The optimal performance can be kept under different weather conditions, and the system can automatically adjust the internal environment, such as temperature and music playing, of the vehicle by analyzing the emotional state of the driver so as to adapt to the emotion of the driver.

The invention belongs to the technical field of battery thermal management, and discloses a battery pack and a phase change material coupling liquid cooling composite thermal management system.The battery pack comprises a plurality of battery structures, each battery structure comprises a lithium battery, a fin structure, a phase change material filling area and a liquid cooling plate, and the fin structure is arranged on the periphery of the lithium battery; the liquid cooling plate is arranged on the periphery of the fin structure, a phase-change material filling area is formed between the liquid cooling plate and the fin structure, and the phase-change material filling area is filled with a phase-change material for absorbing redundant heat and generating phase change, so that the temperature fluctuation of the battery is reduced. The lithium bromide heat pump and the direct-current power supply are combined, and accurate adjustment of the temperature of the battery pack is achieved through efficient heat exchange and intelligent control. The system can be rapidly switched between a cooling mode and a heating mode, and it is ensured that the battery is always kept within the optimal temperature range in different working environments.

The invention belongs to the technical field of power battery cooling, and particularly relates to a flow control method and system for a liquid cooling system of an electric vehicle-mounted power battery, and the method comprises the steps: carrying out the parameterization of a geometric model of the liquid cooling system; establishing an equipment resistance model based on the equipment flow resistance characteristics; initializing flow distribution, constructing a dynamic flow distribution model, calculating the flow of each node and judging whether the flow meets a target requirement or not, and if not, readjusting the flow; calculating the resistance of each section, determining the total resistance of the pipeline, and checking the water pump lift; the flow uniformity is judged by calculating the pipeline resistance between the nodes, and if the flow is not uniform, the flow is redistributed or the pipeline design is optimized until the flow is uniform. Through flow control, the problems of non-uniform flow distribution and poor temperature consistency of multiple battery packs in the prior art are solved, the optimal working state of the power battery is ensured, overheating and overlarge temperature difference are avoided, and the operation efficiency, stability, durability and safety are improved.

The invention discloses a cellulose-based high-thermal-conductivity phase change fiber and a preparation method thereof. The method comprises the following steps: activating cellulose, and dissolving hydroxylated boron nitride nanosheets and activated cellulose to obtain a shell spinning solution; emulsifying hydroxylated boron nitride nanosheets, nanocellulose and a phase change medium in deionized water to obtain a core layer spinning solution; cellulose, a phase change medium and a high-thermal-conductivity component BNNs-OH are assembled into the phase change fiber material, the phase change fiber material can exert the phase change capacity at the temperature of 20-60 DEG C, the thermal conductivity coefficient is 0.5-10 W / (m.K), and the phase change fiber material has good thermal management performance and excellent thermal conductivity and is used as a thermal management fabric, so that the thermal management fabric has good thermal management performance. The catalyst consists of biomass components, can be prepared by a one-step method, and is mild in condition, high in operability, high in production efficiency and suitable for large-scale production and application.

The invention discloses an overcharge control method and system for an electric vehicle, and relates to the technical field of overcharge control, and the method can accurately predict and evaluate the temperature change of a battery by collecting battery data in real time in the overcharge process and combining a normalized data set and a charging feature vector set. Particularly, by constructing a heat and temperature algorithm model, the system can predict the change trend of the battery temperature in the overcharge process. And when the predicted temperature value Tb exceeds the temperature threshold T, the system can immediately trigger an adaptive charging power and cooling system cooperation mechanism, and automatically adjust the overcharge power Pya and the cooling power Pcool. Through the mechanism, when the battery temperature is close to the safety upper limit, the overheating risk can be effectively avoided, and the safety of the charging process is ensured. According to the measure, the accuracy of battery temperature management is remarkably improved, the risk of battery damage caused by abnormal temperature is reduced, and the service life of the battery is prolonged.

The invention discloses a phase change fiber membrane with a composite core-sheath structure and a preparation method and application thereof.The method comprises the steps that polyacrylonitrile is dissolved in N 'N-dimethylformamide and stirred to be completely dissolved, then hydroxylated boron nitride is added, the hydroxylated boron nitride is evenly dispersed through ultrasonic treatment, and a sheath spinning precursor solution is prepared; dissolving polyethylene glycol in N 'N-dimethylformamide, stirring to melt the polyethylene glycol, and taking the polyethylene glycol as a core layer spinning precursor solution; preparing a phase change fiber membrane with a core-sheath structure from the sheath spinning precursor solution and the core spinning precursor solution through a coaxial electrostatic spinning process; and placing the phase change fiber membrane with the core-sheath structure in an ethanol dispersion liquid of hydroxylated boron nitride, carrying out ultrasonic dip-coating, and then carrying out cold pressing treatment to prepare the phase change fiber membrane with the composite core-sheath structure. The obtained composite core-sheath structure phase change fiber membrane has good latent heat property, thermal conductivity and flexibility, and meanwhile, leakage of the phase change material is prevented through the core-sheath structure.

The invention relates to the technical field of electric vehicle heat management, in particular to an indirect heat pump type heat management system. Comprising an electric drive cooling liquid loop, a battery cooling liquid loop, a heating cooling liquid loop and a refrigerant loop. The heating cooling liquid loop comprises a first heating loop and a second heating loop; the first heating loop is connected in series with a warm air core body; the second heating loop exchanges heat with the battery cooling liquid loop through the battery heating heat exchanger; the refrigerant loop comprises a first refrigerating loop, a second refrigerating loop and a third refrigerating loop; the first refrigerating loop exchanges heat with the heating coolant loop through the water-cooled condenser; the second refrigerating loop exchanges heat with the battery cooling liquid loop through the battery cooling heat exchanger; an evaporator used for cooling the passenger compartment is connected to the third refrigeration loop in series. And the battery cooling liquid loop and the electric drive cooling liquid loop are mutually coupled and communicated. The indirect heat pump type heat management system can well meet the heating requirements of a battery pack and a passenger compartment.

The invention discloses a stretching and mixing element for enhancing heat transfer and a screw extruder, the stretching and mixing element for enhancing heat transfer comprises a sleeve, first beads and second beads, the first beads and the second beads are both fixed on the outer wall of the sleeve, and the first beads and the second beads are alternately arranged; the first protruding edges are evenly distributed relative to the circumference of the axis of the sleeve, a first material flow channel is formed by every two adjacent first protruding edges and the outer wall of the sleeve, and third protruding edges are arranged on the first material flow channels. The second protruding edges are evenly distributed relative to the circumference of the axis of the sleeve, two adjacent second protruding edges and the outer wall of the sleeve form a second material flow channel communicated with the first material flow channel, and the side face contour of each second protruding edge is formed by twisting a sine curve by a certain angle in the circumferential direction. According to the invention, the local melt flow direction is changed to generate convective heat transfer, the dispersion distribution mixing effect is enhanced, local temperature rise caused by strong shearing is favorably diffused, and the applicability of the device in materials and processing equipment is widened.

The invention discloses a cable current-carrying capacity calculation method and device and a storage medium, and the method comprises the steps: constructing a steady-state thermal circuit model for a cable, the steady-state thermal circuit model structurally comprises a conductor, an insulating layer, a buffer layer, an aluminum sheath and an outer sheath, constructing an original thermal circuit control equation for each structure of the steady-state thermal circuit model, and constructing a dynamic characteristic curve representing linkage change between the thermal resistance value and the temperature value under each current for each structure of the steady-state thermal circuit model, correcting the original thermal circuit control equation according to the dynamic characteristic curve to obtain a target thermal circuit control equation, and solving the current-carrying capacity of the cable according to the target thermal circuit control equation. The heat conduction characteristics of the cable under different working conditions can be accurately described by constructing a steady-state thermal circuit model of the cable and carrying out detailed analysis on each structure of the cable. An original thermal circuit control equation is established for each structure, and a target thermal circuit control equation is obtained in combination with the dynamic characteristic curve, so that the current-carrying capacity of the cable can be calculated, and the accuracy of detecting the current-carrying capacity of the cable is improved.

The invention discloses a stacked structure of a SiC module and a manufacturing process of the stacked structure. The module forms a full-bridge circuit topology through four SiC MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor) chips. A stacked structure is adopted, four SiC MOSFET chips are divided into two groups to form an upper layer and a lower layer, namely an upper bridge arm and a lower bridge arm of a circuit, the upper layer chip and the lower layer chip are connected through a welding ball and are welded to an upper lining plate and a lower lining plate respectively, a direct-current bus terminal is led out from the upper layer to be connected with an external direct-current power source positive electrode, and a direct-current bus terminal is led out from the lower layer to be connected with an external direct-current power source negative electrode. A direct-current bus terminal is led out from the lower layer to be connected with a negative electrode of an external direct-current power supply, two alternating-current output terminals are led out from a solder ball joint, and a laminated structure reduces a commutation path to obtain low parasitic inductance; the upper lining plate and the lower lining plate of the stacked structure are both connected to the radiator to form a double-face heat dissipation structure, in addition, the upper lining plate and the lower lining plate are connected through the copper columns, low heat resistance is obtained, and the heat reliability problem of the module is solved.

The invention discloses low-VOC (volatile organic compound) formula waterborne polyurethane industrial paint and a preparation method thereof, and relates to the field of paint. The waterborne polyurethane industrial paint with the low VOC formula is prepared from a waterborne polyurethane emulsion, fluoride-based nanoparticles, aliphatic isocyanate, a self-repairing polymer, carbon nanotubes, silane quaternary ammonium salt, a photosensitive curing agent, indium tin oxide, polydimethylsiloxane, zinc pyrithione, polyether siloxane and ammonium tripolyphosphate. According to the waterborne polyurethane industrial paint, the waterborne polyurethane emulsion, the self-repairing polymer, the carbon nanotubes, the indium tin oxide, the aliphatic isocyanate, the polyether siloxane and the like are combined, and the waterborne polyurethane industrial paint is low in VOC, excellent in wear resistance, weather resistance, static resistance and self-repairing performance, environmentally friendly, safe, wide in application prospect and suitable for popularization and application. And lasting protection and attractive effects can be provided for the industrial environment, and meanwhile the convenience of operation and maintenance is improved.

The invention belongs to the technical field of electrochromic devices, and relates to a flexible electrochromic device for heat management of a curved transparent enclosure structure. The electrode is formed by assembling flexible polyethylene glycol terephthalate-indium tin oxide as transparent conductive electrodes on the two sides to clamp a silver-based gel electrolyte. The device is simple in preparation method, controllable in composition and structure and easy to expand; the deposition quality of silver ions is improved through electrode surface plasma cleaning and modification; by applying and removing voltage, the device has reversible dual working modes: an initial state is a solar heating mode, and at the moment, the device has high sunlight transmissivity; voltage is applied to the device to excite deposition of silver on the outer side electrode, at the moment, a radiation cooling mode is adopted, and at the moment, the device has high sunlight reflectivity and high and medium far infrared emissivity; the device has excellent sunlight modulation capability and mechanical stability, and has great application prospects in the aspect of all-season dynamic thermal management of curved transparent enclosure structures such as buildings and automobiles.

The embodiment of the invention aims to provide a chip packaging structure. The circuit board comprises a chip assembly, a substrate and an electrical connection structure between the chip assembly and the substrate. Wherein the electrical connection structure comprises a conductive adhesive, and the conductive adhesive is arranged between the chip assembly and the substrate and is respectively connected with electrical contact points of the chip assembly and the substrate; wherein the phase change material and the conductive adhesive intersect to form a heat dissipation structure. By using the conductive adhesive as a connection means between the chip and the PCB, the embodiment of the invention can realize a thinner connection layer, thereby significantly shortening a signal transmission path, reducing connection impedance, and improving the quality and speed of signal transmission. And moreover, the phase-change material is introduced to optimize heat dissipation, so that heat can be quickly absorbed and released in a local high-heat-flux area, and the temperature peak value in the package is reduced.

The invention discloses a double-temperature-zone liquid cooling heat management system, an operation method and an energy storage system applying the double-temperature-zone liquid cooling heat management system. The double-temperature-zone liquid cooling heat management system comprises a first temperature zone heat management subsystem and a second temperature zone heat management subsystem. A first circulating pump, a heater, a first heat exchanger and a liquid cooling medium channel of a first radiator of the first temperature zone heat management subsystem are sequentially and circularly communicated; a second circulating pump, a second radiator and a liquid cooling medium channel of a second heat exchanger of the second temperature zone heat management subsystem are sequentially and circularly communicated; the first temperature zone heat management subsystem and the second temperature zone heat management subsystem can selectively operate independently and can also selectively communicate with each other to operate. The invention mainly solves the problem of how to provide a heat management system with double temperature zones for an energy storage system. According to the invention, the thermal management temperature zone requirements of the battery pack and the power conversion device can be met more effectively, and the system has the characteristics of high integration level, rich functions, good thermal management effect, low energy consumption and good economical efficiency.

The utility model discloses a laser collimation module capable of expanding beams for multiple times. The laser collimation module comprises a laser collimation module body arranged on one side of a galvanometer adapter plate, a beam expanding structure arranged at one end of the laser collimation module body and a heat sink structure arranged outside the laser collimation module body. The horizontal projection cylinder is arranged between the fixed seat and the galvanometer adapter plate, the laser collimation cylinder is arranged on one side of the fixed seat, the fixed plate is arranged in the fixed seat, and the reflector is arranged in the fixed plate; the first lens barrel is arranged outside the laser collimation barrel, the second lens barrel is connected with the first lens barrel, and the third lens barrel is connected with the second lens barrel; a first glass lens is arranged in the first lens cone, a second glass lens is arranged in the second lens cone, and a third quartz lens is arranged in the third lens cone; the plurality of integrated assemblies are arranged outside the laser alignment module, and the plurality of heat sink assemblies are arranged inside the integrated assemblies. According to the utility model, the laser beam can be effectively expanded by multiple times, and the requirements of different application scenes on the size of the laser beam can be met.

The invention discloses a phase-change heat-conducting composite material with a core-sheath structure and a coaxial DIW printing preparation method of the phase-change heat-conducting composite material with the core-sheath structure, h-BN is stripped through bio-based polyphenol / Ag < + > assisted ball milling, BNNS (Ag-BNNS) functionalized by bio-based polyphenol and modified by Ag nanoparticles is prepared by utilizing the reducibility of the bio-based polyphenol to metal ions, the transverse size of the BNNS is about 1-3 microns, and the thickness of the BNNS is about 5 nm. A phase-change heat-conducting composite material with a core-sheath structure is constructed through coaxial DIW printing assisted by ultraviolet light, Ag-BNNS / polydimethylsiloxane (PDMS) is used as a packaging layer (sheath layer), and polyethylene glycol is used as a core material phase-change material. By means of coaxial printing, packaging of PEG2000 is achieved, meanwhile, an annular heat conduction structure is constructed, Ag-BNNS is further oriented under the extrusion effect to form a compact heat conduction outer layer with a three-dimensional heat conduction network, and the phase change heat conduction composite material shows the high heat conduction coefficient (0.70 W.m <-1 >. K <-1 >) and the high phase change enthalpy (65.4 J / g).

The invention discloses a three-dimensional carbon aerogel composite material based on aramid nanofibers as well as a preparation method and application of the three-dimensional carbon aerogel composite material, and belongs to the technical field of electromagnetic wave absorbing materials. The three-dimensional carbon aerogel composite material comprises aramid nanofiber aerogel, nickel cobaltate, a cobalt metal simple substance, a nickel metal simple substance and a carbon nanotube, the nickel cobaltate, the cobalt metal elementary substance, the nickel metal elementary substance and the carbon nano tube are loaded on the aramid nanofiber aerogel. By doping magnetic and dielectric materials into the aramid nanofiber aerogel, a magnetic-dielectric synergistic effect is effectively constructed, impedance matching is improved, and thus absorption of incident electromagnetic waves is improved. The prepared three-dimensional carbon aerogel composite material based on the aramid nanofibers achieves excellent wave absorbing performance under the synergistic effect of appropriate impedance matching and multiple loss mechanisms, and also shows good thermal management capability.

The present invention discloses a wear-resistant liquid-cooled cable with an ultra-large current load for new energy, and belongs to the technical field of liquid-cooled cable processing. The present invention is used to solve the technical problem in the prior art that the wear resistance of liquid-cooled cables and the heat dissipation efficiency in high-temperature environments need to be further improved. A wear-resistant liquid-cooled cable with an ultra-large current load for new energy includes a plurality of conductors, and the exteriors of the plurality of conductors are sequentially provided with an insulating layer, a shielding layer, and an outer sheath layer; a heat exchange layer composed of a plurality of heat exchange tubes is provided between the shielding layer and the outer sheath layer, and the plurality of heat exchange tubes are all arranged in a spiral shape. The present invention improves the heat exchange performance inside the cable by preparing the insulating layer using a thermally conductive filler, and improves the thermal insulation and wear resistance of the cable outer sheath layer by preparing the cable outer sheath layer by synthesizing a composite polyolefin, thereby obtaining a liquid-cooled cable with high heat exchange efficiency inside, wear resistance outside, and suitable for high temperatures.

The embodiment of the invention provides a low-noise hundred-ampere-level current source which can be applied to the technical field of current sources. The current source comprises a loop compensation module, a voltage driving circuit and a current detection feedback module which are sequentially connected in series, the current source further comprises an energy storage module which is connected with the voltage driving circuit and the current detection feedback module in parallel, and the energy storage module is used for providing electric energy for a load coil; the loop compensation module is used for performing compensation operation on the accessed analog control signal and the voltage feedback signal and outputting a compensation signal; the voltage driving circuit is used for obtaining electric energy from the energy storage module through the load coil based on the compensation signal output by the loop compensation module so as to provide output current for the current detection feedback module; and the current detection feedback module is used for sampling the output current, converting the output current into a voltage feedback signal and outputting the voltage feedback signal to the loop compensation module to form a feedback loop so as to adjust the output current.

The invention belongs to the technical field of battery safety, and particularly relates to a phase change heat insulation baffle, a preparation method and application thereof, and a soft package battery module. The invention provides a phase-change heat-insulation barrier plate. The phase-change heat-insulation barrier plate comprises a phase-change heat-insulation material and a packaging film for packaging the phase-change heat-insulation material, the phase-change thermal insulation material comprises a substrate material, and a phase-change material and a flame-retardant material which are adsorbed on the substrate material, the substrate material comprises a silicon dioxide nanofiber felt and a supporting material; the phase-change material comprises one or more of silica sol, alumina sol and a saturated calcium chloride solution, and the flame-retardant material comprises a phosphorus-containing flame retardant. The phase-change thermal insulation material contains the phase-change material and the thermal insulation substrate, has a very high phase-change enthalpy value, plays a good role in blocking heat spreading through thermal insulation of the thermal insulation material and phase-change energy consumption of the phase-change material during thermal runaway, and can delay the heat spreading time or inhibit the heat spreading.

The invention discloses a peak current sampling circuit, a switching power supply controller and a switching power supply. The switching power supply adopts a power switch tube to control electric energy transmission from an input end to an output end so as to generate an output voltage according to an input voltage, and the peak current sampling circuit comprises a voltage sampling module, an output voltage sampling module and a peak current sampling module, the sampling module is used for synchronously sampling the drain-source voltage difference of the power switch tube according to the turn-on and turn-off actions of the power switch tube so as to obtain a first sampling signal with a positive temperature coefficient; and the temperature compensation module is used for performing temperature compensation on the first sampling signal to obtain a second sampling signal with a zero temperature coefficient, and the second sampling signal carries peak current information of the switching power supply. Peak current sampling can be realized without arranging a sampling resistor in the switching power supply, so that the power consumption and the cost of the circuit can be reduced, and the sampling precision of the circuit can be ensured not to be influenced at the same time.

The invention relates to the field of hydrogen production by water decomposition through thermochemical sulfur-iodine circulation, in particular to an HIx phase purification process and system for hydrogen production through thermochemical sulfur-iodine circulation, the process comprises a Bunsen reaction, a sulfuric acid decomposition reaction and an HI decomposition reaction, and an HIx phase obtained through the Bunsen reaction flows into an HIx phase purification tower; sulfuric acid impurities in the HIx phase are subjected to temperature reduction, pressure reduction and temperature rise in the tower to be converted into hydrogen sulfide; hydrogen sulfide gas is separated out from the solution and then enters a hydrogen sulfide combustion tower, the hydrogen sulfide gas and oxygen generated by decomposition of sulfuric acid are combusted into sulfur dioxide under the oxygen-enriched condition, and sulfur is returned to Bunsen for reaction in the form of sulfur dioxide. According to the method, a side reaction path regulation strategy is adopted, sulfuric acid impurities in the HIx phase are completely converted into sulfur dioxide, harm of sulfur dioxide to a hydroiodic acid decomposition catalyst is avoided, extra impurities are not introduced in the whole purification process, extra energy consumption input is not needed, system heat management is optimized, and the heat efficiency and the energy utilization rate of the whole system are improved.

The invention relates to a hot zone gas treatment unit of a solid oxide fuel cell. A mixer is transversely arranged in a combustion pipe, a combustion cavity is formed in the lower end of the mixer, an anode waste gas conveying pipe and a cathode waste gas conveying pipe are arranged at the upper end of the mixer, the anode waste gas conveying pipe and the cathode waste gas conveying pipe are connected into the galvanic pile, and the lower ends of the anode waste gas conveying pipe and the cathode waste gas conveying pipe are communicated with the combustion cavity. The preheating pipe and the heat exchanger are sleeved on the combustion pipe, a deionized water conveying pipe, a fuel conveying pipe and a mixed gas conveying pipe are arranged outside the preheating pipe, the mixed gas conveying pipe is communicated with the reformer, a reforming conveying pipe at the lower end of the reformer penetrates through the heat exchanger and is connected into the electric pile, and an air pipe penetrates through the heat exchanger and is connected into the electric pile. Waste gas conveyed by the anode waste gas conveying pipe and the cathode waste gas conveying pipe is combusted in the combustion cavity to generate heat, preheated fuel and deionized water are vaporized, the mixed fuel and vaporized deionized water enter the reformer, then are heated by the heat exchanger and enter the electric pile, and heat recycling is achieved.

The invention belongs to the technical field of cell testing, and particularly discloses a dual-preheating SOFC / SOEC hybrid testing system and method, the system comprises an air heating pipeline and a fuel gas heating pipeline, the air heating pipeline is connected with the cathode side of an SOFC / SOEC electric pile, and the fuel gas heating pipeline is connected with the anode side of the SOFC / SOEC electric pile; the cathode side of the SOFC / SOEC electric pile is also connected with the inlet of the combustor; an outlet of the combustor is connected to the air inlet end of the air heating pipeline and / or the air inlet end of the fuel gas heating pipeline, so that tail gas of the combustor can preheat air and fuel gas participating in the reaction next time and then is discharged from the air inlet end of the air heating pipeline and / or the air inlet end of the fuel gas heating pipeline. The SOFC testing system and the SOEC testing system are integrated, meanwhile, tail gas waste heat can be efficiently recycled, air and fuel gas are preheated through the tail gas waste heat, and the energy consumption of the testing system is further reduced.

The invention discloses a dynamic heat dissipation adjusting method and system for a wind direction predictor of a wind energy storage cabinet, and belongs to the technical field of environment-friendly energy equipment, and the method comprises the steps: obtaining the actual working temperature of the wind direction predictor and related environment parameter data in real time, and storing the actual working temperature and related environment parameter data in a constructed parameter database; analyzing the data in the parameter database to construct a temperature model of the wind direction predictor; reading environmental parameter data in the parameter database, performing short-term prediction on environmental parameters, constructing an environmental prediction model, and generating an environmental prediction sequence; inputting the environment prediction sequence into the temperature model, calculating the predicted working temperature of the wind direction predictor, and formulating a heat dissipation regulation table; the actual working temperature of the wind direction predictor is continuously collected, the deviation between the actual working temperature and the predicted working temperature is calculated, the heat dissipation adjusting table is updated, and unnecessary energy consumption is reduced.

The utility model provides a lower box body of a battery pack, and relates to the technical field of new energy batteries. The battery pack lower box body comprises a bottom plate and a liquid cooling plate; the liquid cooling plate and the bottom plate are connected in a buckling manner and enclose a closed cavity; a flow channel cavity is formed in the liquid cooling plate; the flow channel cavity is provided with a plurality of groups of bulge structures for shunting; the lower box body of the battery pack further comprises a reinforcing part; the reinforcing part is arranged in the cavity; the top of the reinforcing part is fixedly connected with the liquid cooling plate, and the bottom is fixedly connected with the bottom plate; according to the lower box body of the battery pack provided by the utility model, the structural form of integrating the lower box body and the liquid cooling plate is adopted, so that the overall structural strength and rigidity of the lower box body and the battery pack can be enhanced, and meanwhile, the heat exchange efficiency of the liquid cooling plate can be improved.

The invention relates to an LED epitaxial wafer, a growth method of a graphene layer and an LED chip, and belongs to the technical field of LEDs. The LED epitaxial wafer comprises a substrate, and a graphene layer, a buffer layer, an undoped GaN layer, an n-type GaN layer, a stress release layer, a multi-quantum well layer, an electron barrier layer and a p-type GaN layer which are sequentially epitaxially grown on the substrate, wherein the thickness of the single graphene layer is 0.5-1.5 nm, and the number of the graphene layers is at least two. According to the LED epitaxial wafer provided by the invention, the defect density in the GaN template layer is reduced through deposition of the graphene interlayer. Therefore, the recombination efficiency of electrons and holes is improved, so that the luminous efficiency of the LED is enhanced. Due to the existence of the graphene layer, the compressive strain of the chip is reduced, the influence of a polarization field is reduced, and the emission wavelength of electroluminescence (EL) is more stable.

The kilowatt-level metal fuel cell stack comprises a cell stack main body, a plurality of groups of first heat conduction plates are fixedly mounted on the outer surfaces of the two sides of the cell stack main body, a circulating water pipe is mounted between heat dissipation frames, and the two ends of the circulating water pipe are connected with the heat dissipation frames respectively. And the liquid outlet and the liquid return port are connected with the liquid storage bin, a circulating pump is arranged at one end of the liquid outlet, a second cooling fin set is installed on the outer surface of one side of the liquid storage bin, and a cooling mechanism is arranged on the outer surface of the second cooling fin set. The cooling liquid is driven by the circulating pump to circularly flow between the cell stack main body and the liquid storage bin, and the system realizes efficient transfer and dissipation of heat. Compared with a traditional natural cooling or air cooling mode, the temperature of the cell stack can be rapidly reduced through water-cooling circulation cooling, and stable operation of the cell stack in a high-power output state is ensured.

The invention discloses a flat pipe, a heat exchanger, a vehicle heat management system and a vehicle, and belongs to the technical field of vehicle heat management. The flat pipe forms a first flow channel and a second flow channel which are separated and arranged side by side, the first flow channel is suitable for circulation of a first heat exchange medium, and the second flow channel is suitable for circulation of a second heat exchange medium. Through the partition integrated design of the first flow channel and the second flow channel, the overall structure of the flat pipe is simplified, the overall heat resistance is reduced, and the heat exchange efficiency is greatly improved, so that the heat management effect of the vehicle heat management system is optimized, meanwhile, the machining difficulty and machining cost of the flat pipe are reduced, and the production efficiency is improved. Therefore, large-scale production and popularization and application are facilitated.

This invention discloses a dual-component thrust attitude control engine, comprising a mounting plate, a swirling mixer, an igniter, and a combustion chamber nozzle. The mounting plate contains two isolated gas chambers, each with an intake pipe connected to its inlet and an on / off controllable solenoid valve at its outlet. The two inlets of the swirling mixture are connected to the outlets of the two gas chambers, and the outlet of the swirling mixer is connected to the inlet of the combustion chamber nozzle. The swirling mixer is used to swirl and mix the gas input into it before outputting it. The igniter is used to ignite the mixed gas input into the combustion chamber nozzle. The combustion chamber nozzle is used to supply the combusted mixed gas for combustion output. This configuration solves the problem that existing technologies cannot simultaneously achieve compact structure, high mixing efficiency, and excellent thermal management performance.