46results about How to "Improve equalization performance" patented technology

The invention provides a battery system management method and a battery system, and relates to the technical field of batteries, the battery system is connected with a load to supply power to the load, the battery system comprises a plurality of parallel battery branches and a master control, each battery branch comprises a battery pack and a slave control, each battery pack comprises a plurality of single batteries, and the slave control is in communication connection with the master control; the method comprises the steps that after charging or discharging is stopped, a battery system is placed in a standing stage, in the standing stage, the battery system is disconnected from a load, a plurality of battery branches connected in parallel are kept connected, and a master controller and a slave controller are powered on; judging whether the battery system needs to be balanced or not according to the inter-pack loop current between every two battery packs in the battery system; when the battery system needs to be equalized, the battery system is actively equalized in the standing stage; when the battery system does not need to be balanced, the battery system is placed in an off-line stage, and in the off-line stage, the plurality of parallel battery branches are disconnected, the master-slave controller is placed in a power-off state, and the battery system and the load are kept disconnected.

The embodiment of the utility model relates to the technical field of vehicle suspensions, in particular to a damping suspension system and a vehicle suspension device, which comprise a front suspension hydraulic cylinder provided with a first piston, and the first piston forms a first piston upper chamber and a first piston lower chamber in the front suspension hydraulic cylinder; the rear suspension hydraulic cylinder is provided with a second piston, and the second piston forms a second piston upper chamber and a second piston lower chamber in the rear suspension hydraulic cylinder; the first pipeline is communicated with the first electric control valve; the second pipeline is communicated with the first damping adjusting valve, the second electric control valve, the third electric control valve and the second damping adjusting valve, the second pipeline is provided with a first oil return pressure tank, and the first oil return pressure tank is respectively communicated with the first damping adjusting valve and the second electric control valve. The buffering and damping effects of the suspension can be adjusted, the requirements of different road conditions are met, the driving experience of a user is improved, and the texture of the whole vehicle is improved.

The invention relates to a cloud host load balancing method and device, equipment, a medium and a product, and relates to the technical field of cloud computing. The method comprises the following steps: monitoring first load information of resources of each cloud host node included in a cloud platform in real time; when the first load information of the resources of any cloud host node is greater than a preset load threshold value, determining the distribution condition, resource capacity and second load information of the virtual machines of each cloud host node according to the first load information; determining a weighted mean square error function and a constraint function according to the total number of the cloud host nodes, the distribution condition of the virtual machines, the resource capacity, the second load information and a preset weight factor of each resource; carrying out iterative calculation by adopting a differential evolution algorithm according to the weighted mean square error function and the constraint function, and determining an optimal load balancing scheme; and adjusting the distribution condition of the virtual machines of each cloud host node according to the optimal load balancing scheme. By adopting the method, the balance of resource allocation can be improved.

The invention relates to the technical field of fan heat dissipation, in particular to an energy-saving industrial centrifugal fan capable of assisting heat dissipation of a motor. The energy-saving industrial centrifugal ventilator comprises a machine shell with an air inlet and an air outlet, a first impeller is rotationally arranged in the machine shell, and one end of the first impeller is coaxially connected with a motor arranged outside the machine shell. Gas is guided through the pressure intensity difference between the air inlet and the air outlet, cooling liquid is cooled in the process that external gas is sucked in, and the gas at the air outlet drives the cooling liquid to circularly flow through the double-turbine assembly in the flowing process. Thus, when the power of the motor is increased or decreased, the rotating speed of the first impeller changes correspondingly, so that the flow speed of gas in the suction pipe and the flow guide pipe is affected, circulation and heat exchange of cooling liquid are adjusted correspondingly, and then the heat dissipation balance of the motor is improved.

The embodiment of the invention relates to the technical field of display equipment, in particular to a display cabinet. According to the display cabinet disclosed by the embodiment of the invention, the evaporator is arranged in the mounting cavity to absorb heat in air in the storage chamber; and the cross-flow fan is arranged to drive air to circularly flow between the storage chamber and the mounting cavity. The water pan part is formed on the bottom wall of the mounting cavity so as to receive defrosting water of the evaporator; a mounting groove is formed in the bottom wall of a mounting cavity so as to accommodate at least part of a motor; the protruding part is formed on the bottom wall of the mounting cavity, so that a barrier is formed for the side, facing the cross-flow fan, of the water pan part, and defrosting water in the water pan part is prevented from flowing back to one side of the cross-flow fan. The flow guide channel is formed in the bottom wall of the mounting cavity through construction and communicates with the water pan part and the mounting groove, so that condensate water possibly existing in the mounting groove enters the water pan part through the flow guide channel and is discharged, the risk that a motor of the cross-flow fan is eroded by water is reduced, and the safety of the cross-flow fan is improved.

The utility model belongs to the technical field of environmental protection, and particularly discloses a CVD sintering furnace acid gas tail gas treatment device which comprises a pipeline connected with the exhaust end of a sintering furnace, and a first filtering assembly, a cleaning assembly and a second filtering assembly are sequentially arranged in the length direction of the pipeline. The cleaning assembly comprises an oil washing part and a water washing part; the oil washing part comprises a mixing chamber and a separation chamber, the mixing chamber is used for mixing gas and oil, and the separation chamber is used for separating the gas and the oil; the washing part comprises a spray tower which is communicated with the pipeline; the spray tower is provided with a spray head; the spray header is used for spraying alkali liquor into the spray tower; the spray tower is provided with a pH sensor which is used for detecting the pH value of the alkali liquor. According to the utility model, particle filtration and multi-stage purification are realized, the safety of the device can be effectively improved, and the problems of easiness in corrosion, low protection effect and low treatment efficiency of equipment in the prior art are solved.

The invention relates to the technical field of intelligent traffic control, in particular to an unobservable road section-oriented network-level traffic operation state inference method, which comprises the following steps of: by taking checkpoint detection data as a data basis, completing data preprocessing based on checkpoint data characteristics, and extracting traffic flow characteristic parameters; constructing a model algorithm based on a Bayesian network and a traffic flow fundamental diagram, and realizing traffic flow characteristic parameter completion for unobservable road sections; spatial characteristics of a road network are introduced on the basis of constructing a double attention mechanism-directed graph long short-term memory network model. Therefore, the traffic management department can extract the traffic flow characteristic parameters by means of the checkpoint and complement the traffic flow characteristic parameters of the unobservable road section by means of the model algorithm so as to construct a complete road network traffic state inference model. Therefore, the problem that the real-time traffic state cannot be mastered due to the lack of corresponding detection equipment in part of road sections in a real urban road network is solved, and the traffic operation state of the whole road network can be deduced and mastered.

The application provides a heat exchange device, a single-phase module, a power device, an energy storage converter and an energy storage station, and relates to the technical field of energy storage converters. The heat exchange device comprises a heat exchange element, a liquid outlet end and a liquid inlet end. The heat exchange element has a first included angle with a horizontal plane, and the heat exchange element comprises a heat exchange flow channel configured to circulate a heat exchange medium. The liquid inlet end is arranged on the heat exchange element and is in communication with the heat exchange flow channel. The liquid outlet end is arranged on the heat exchange element and is located above the liquid inlet end. The liquid outlet end is also in communication with the heat exchange flow channel. The application can improve the heat exchange effect of the heat exchange device, thereby improving the temperature uniformity of the single-phase module.

The application discloses a natural gas desulfurization process multi-target prediction modeling method and system, relates to the natural gas desulfurization technical field, and solves the problems that in the prior art, the data quality is low, the influence variables are multiple and complex, and it is difficult to predict multiple targets in the prediction of the sulfur content of product gas in the natural gas processing process. The scheme points are as follows: obtaining production data in a natural gas desulfurization process; performing filtering processing on the production data based on adaptive classification filtering processing to obtain processed production data; performing joint dimension reduction processing on the processed production data to obtain dimension-reduced production data; training a multi-task learning model based on the dimension-reduced production data to obtain a natural gas desulfurization process multi-target prediction model; in the training process, the loss function weight coefficient in the training is calculated through the learning rate of each prediction target in adjacent training rounds; and the multi-task learning model is trained based on the data processed through the Savitzky-Golay filtering and joint dimension reduction, so that the above problems are solved.

The utility model discloses a balanced feeding device for cultivation in the technical field of cultivation feeding, which comprises a material carrying box, a feeding frame used for feeding is arranged at the top of the material carrying box, a feeding frame is arranged at the bottom of the material carrying box and close to one end, a driving piece is arranged at one end of the material carrying box, and a discharging piece is arranged at the other end of the material carrying box. A stirring assembly used for mixing feed is installed on the inner side of the material carrying box, the stirring assembly can scatter and refine caked feed and can fully stir and mix the feed and other feed, a material guiding assembly can control the feeding speed and the feeding amount of the feed, too much or too little feeding is avoided, and the feeding efficiency is improved. The problems that the feeding amount of feed is too large or too small, the feeding amount cannot be conveniently controlled, the existing equipment cannot uniformly stir and mix the feed, the feed is easily caked to cause blockage, the feed supply is unbalanced, and the feeding efficiency is low are solved by directly supplying the feed by opening a valve in the discharging process of the existing equipment. And the precision and the practicability of the equipment for controlling the discharging amount are influenced.

The invention relates to the technical field of active noise control, and provides a binaural cooperative active noise control method based on a combined cost function. The objective of the invention is to solve the problems of asynchronous convergence rates of left and right ears and inconsistent steady-state errors caused by factors such as physiological structure difference of left and right ear canals, inconsistent wearing fitness of earphones and asymmetrical directivity of loudspeakers. According to the method, a combined cost function including an overall error term, an instantaneous error term and an accumulative error term is constructed, the contribution proportion of each error term is automatically adjusted through a dynamic weight adjustment mechanism, and the weight of a control filter is updated based on a gradient descent method, so that the convergence speed and the steady-state error of a left sound channel and a right sound channel tend to be consistent. The consistency and balance of the binaural active noise control performance can be improved, and the method can be suitable for application scenes such as active noise reduction earphones and intelligent cabins.

The invention discloses a cross-machine-room scheduling optimization method based on a dynamic water level value, which is suitable for a framework with a CPU (Central Processing Unit) as a main node and a GPU (Graphics Processing Unit) as a sub-node, and comprises the following steps of: 1, estimating the load of each sub-node in real time by adopting a weighted moving average method; step 2, based on the real-time load data of the weighted moving average in the step 1, calculating a corresponding task allocation adjustment amount through a PID controller so as to realize dynamic task allocation for each child node; step 3, using the communication frameworks of Netty, transmitting real-time load information to the main node by the child node, and performing global scheduling decision by the main node according to the collected information; and step 4, the main node adjusts a task allocation strategy in real time according to the collected load condition of each child node. According to the cross-machine-room scheduling optimization method based on the dynamic water level value, the load of each child node is estimated in real time by adopting a weighted moving average method, so that the hysteresis of load information acquisition is avoided.

The invention discloses a paddy field culture water body control method and system, and the method comprises the following steps: obtaining oxygen content distribution condition data and water body pH value distribution condition data in a paddy field, the oxygen content distribution condition data being the oxygen content condition of each region in the paddy field, and the pH value distribution condition data being the pH value condition of the water body of each region in the paddy field; according to the oxygen content distribution condition data and the pH value distribution condition data, aquatic product distribution condition data in the paddy field are analyzed and recognized, and the aquatic product distribution condition data comprise first area position data with low aquatic product density, second area position data with high aquatic product density and third area position data with medium aquatic product density; and based on the aquatic product distribution condition data, feeding bait to a first area position in the paddy field, and increasing oxygen supply to a second area position in the paddy field. According to the technical scheme, the quality uniformity of aquatic products bred in the rice field can be effectively improved, the damage rate of the aquatic products is reduced, and the production efficiency and quality are improved.

The utility model discloses a battery formation and capacity grading needle bed. The battery formation and capacity grading needle bed comprises a needle bed main body, a battery tray and a heat dissipation assembly, the battery tray is arranged on the needle bed main body and is used for bearing a plurality of batteries; the heat dissipation assemblies are arranged on the needle bed body, the heat dissipation assemblies are installed on the two sides of the battery tray, each heat dissipation assembly comprises a plurality of air supply devices and an installation support, and the air supply devices are installed on the installation supports; a plurality of first heat dissipation holes are formed in the positions, corresponding to the tabs of the battery, of the battery tray in a hollowed-out mode, the installation support is movably installed on the needle bed body, and the installation support drives the air supply devices to be movably attached to the first heat dissipation holes of the battery tray so that air can be blown to the tabs of the battery. According to the technical scheme, the heat dissipation effect of the batteries in the battery formation capacity grading needle bed can be improved.

The invention relates to the technical field of storage, and discloses a submission queue scheduling method and device, a solid state disk and a readable storage medium. The method is applied to the solid state disk, a submission queue and a completion queue are designed in the solid state disk, and the method comprises the following steps: in a round of polling scheduling, when a command in a target submission queue in a submission queue set is called and a calling result is put into a corresponding completion queue, binding a calling success identifier with the target submission queue; traversing the binding condition of the calling success identifier of each submission queue in the submission queue set, and judging whether the round of polling scheduling is completed or not; and if it is determined that the current round of polling scheduling is completed, executing the next round of polling scheduling. In one round of polling scheduling, which submission queues are not called can be determined through the submission queue calling completion and calling success identification, and then the submission queues are called, so that disordered preemption of completion queue resources among a plurality of submission queues is avoided, and the scheduling balance of the submission queues is improved.

This disclosure provides a model training method, comprising: extracting features of an image, the features including channel dimension, height dimension, and width dimension; dividing the features into multiple feature blocks along the channel dimension; calculating entropy constraints of the features based on the encoding entropy of each feature block; and training an encoder based on the entropy constraints of the features, the encoder being used to generate compressed codes for the image. This disclosure also provides a method for training a generator using the encoder trained by this model training method, and for generating compressed codes for input image labels based on the generator.

The invention relates to the field of hot pressing devices, and discloses a pressing device for touch screen processing, which comprises a placing frame, two groups of first clamping plates are slidably mounted on the bottom wall of an inner cavity of the placing frame, and first springs are fixedly mounted between the two groups of first clamping plates and the inner cavity wall of the placing frame. The anti-friction assembly comprises movable grooves formed in the first clamping plates, magnet pieces are fixedly installed in inner cavities of the two movable grooves, second clamping plates are installed on the opposite sides of the two magnet pieces in a magnetic attraction mode, and the two second clamping plates are installed in the inner cavities of the adjacent movable grooves in a sliding mode. The outer touch screen and the screen can be accurately aligned, meanwhile, friction is avoided in the pressing process, the uniformity of pressure distribution and the stability of pressing movement of the outer touch screen can be effectively improved, the situation that the surface of the outer touch screen is easily scratched due to friction in the prior art is avoided, and the production efficiency is improved. Therefore, the pressing effect of the screen and the touch outer screen can be effectively achieved.

The application relates to the chip technical field, in particular to a processing method of an execution chain of a calculation graph, equipment and a medium. The method comprises the following steps: a CPU side acquires resource consumption of each execution chain of a target calculation graph; the CPU side sequentially determines different execution chains as benchmark chains, for any benchmark chain, the benchmark chain is paired with other execution chains; for any pair, whether node migration needs to be performed on two execution chains included in the pair is judged according to resource consumption of the two execution chains in the pair; if there is no pair needing node migration, an aggregation process is entered; if the number of execution chains after the aggregation is completed is less than or equal to the number of queues included in a GPU, the CPU side sends task packages corresponding to different execution chains to different queues of the GPU. The application improves the balance of the GPU queue load.

This utility model discloses a split-type paper tube drying chamber, relating to the field of drying equipment technology. It includes a paper tube drying chamber and a main operating unit. A main drying chamber body is located on one side of the main operating unit. A moisture conveying pipe is installed on the outer wall of the main drying chamber body, and a heat exchanger is fixedly connected to one end of the moisture conveying pipe. This utility model, by setting up an insulation sleeve, improves the uniformity of heat flow inside the drying chamber and the insulation effect of the return pipe during heat return transport, preventing heat loss and significant losses. When the drying chamber temperature reaches the target temperature or after a predetermined running time, the central controller transmits a signal to the first and second fan units, causing a change in the conveying path of the fan units. This changes the direction of hot air within the conveying channel, improving the heat uniformity within the drying chamber.

An equalization control circuit for prolonging the service life of a battery energy storage system comprises a battery management system and an equalization circuit module electrically connected with the battery management system. The equalization circuit module comprises an inter-cell equalization circuit and an inter-module equalization circuit; the n single batteries of the whole module are averagely divided into m battery packs, each battery pack comprises k single batteries, m is greater than or equal to 2, and k is greater than or equal to 2; the inter-cell equalization circuit is arranged between every two adjacent single batteries in the battery pack; k single batteries connected in series in each battery pack are regarded as a whole, the positive electrode of the first battery serves as the positive electrode of the battery pack, the negative electrode of the kth battery serves as the negative electrode of the battery pack, the inter-module equalization circuit is connected between the positive electrode and the negative electrode of each battery pack, and the inter-module equalization circuit is further connected with the whole module through the transformer. According to the utility model, the electric quantity transfer between the adjacent single batteries in the battery pack and the bidirectional electric quantity transfer from any battery pack between the battery modules to the whole can be realized.

This disclosure provides embodiments of a video encoding / decoding and display method, apparatus, electronic device, and computer-readable medium. One specific implementation of the method includes: splitting each video frame to be encoded to obtain a set of video frame blocks; determining a set of video frame block encoding channels that meet interrupt triggering conditions; performing key video frame block peak shifting processing on each video frame block to be encoded to obtain a set of key video frame encoding blocks and a set of channel delay encoding time differences; performing video encoding on each video frame block to be encoded to obtain a set of video frame block channel bitstreams; determining the decoding and splicing threads for the video frame block channel bitstream set to obtain a set of decoding and splicing threads; performing video frame block decoding and splicing on the video frame block channel bitstream set to obtain a decoded video; and performing video frame display processing on the decoded video. This implementation can improve the balance of the bitstream after video encoding, improve the stability and real-time performance of transmitted video, and reduce video transmission latency.

The utility model relates to the technical field of gas analysis, and discloses a dustproof gas analysis instrument which comprises an analysis main body, a plurality of groups of analysis gas inlet holes are formed in the back surface of the analysis main body, a coating cover is fixedly mounted on the back surface of the analysis main body through bolts, and a plurality of groups of exhaust holes are formed in the left side surface and the right side surface of the coating cover. According to the dustproof type gas analysis instrument, through the filtering assembly, a circulating fan drives external air to enter a dust filtering pipe through a second gas guide pipe and a front side diameter expanding cover, air in the dust filtering pipe enters a rear side diameter expanding cover through a dust filtering net cylinder under the pressure effect, and dust particles in the air are filtered and separated by the dust filtering net cylinder in the process; the filtered air enters the analysis main body through the analysis air inlet hole for detection operation, so that the number of dust particles in the air entering the analysis main body is reduced, the accuracy of a detection structure of the device is improved, and the practicability of the device is enhanced.

This invention belongs to the field of biomedical technology and discloses a chimeric antigen receptor targeting CD20, its gene expression construct, and its applications. The chimeric antigen receptor provided by this invention specifically includes an amino acid fragment with the sequence shown in SEQ ID NO:29 or a variant fragment having at least 85% sequence identity with SEQ ID NO:29. Its functional fragments, including the signal peptide, antigen-binding region, hinge region, transmembrane region, intracellular co-stimulatory domain, and signal transduction domain, form an organic whole, working synergistically to endow the chimeric antigen receptor with good CD20-targeting binding, T-cell activation, and cell-killing effects, demonstrating excellent application potential in the preparation of drugs for the treatment of relapsed / refractory B-cell malignancies.

The present invention relates to the technical field of quenching forging pipes, and more specifically, to a lifting method for quenching forging pipes for pressure vessels. The lifting mechanism includes a bracket, a movable plate is slidably provided inside the bracket, a hydraulic rod is fixedly connected to the bottom of the movable plate, an electric clamp is provided at the output end of the hydraulic rod for clamping the forging from the forging area to the quenching area, and two control mechanisms are provided on the outer wall of the electric clamp; the present invention starts the hydraulic rod to move upward, driving the electric clamp, the control mechanism, the receiving mechanism and the connecting plate to reset and move, and under the force of the No. 1 reset spring to restore the deformation, the two connecting plates are driven to move toward the central axis of the hydraulic rod in cooperation with the rotating ring and the movable rod, and gradually fit together, so that when the electric clamp clamps the forging to be quenched and moves to the quenching area, the two connecting plates are in a V shape, which can receive the molten beads dropped from the bottom of the forging to prevent the molten beads from scattering everywhere.

The present invention is a soil fertility improvement system, which relates to the technical field of soil improvement, and includes a fertility adding mechanism that travels on a field ridge and is used to increase soil fertility, wherein a traction mechanism that cooperates with the fertility adding mechanism is provided on the field ridge, and the traction mechanism includes a first traction component and a second traction component that are respectively provided at both ends of the field ridge; a feeding mechanism that cooperates with the fertility adding mechanism is provided on the traction mechanism, a docking mechanism that cooperates with the fertility adding mechanism is provided on the traction mechanism, and an auxiliary consignment component that assists in consigning the fertility adding mechanism is provided on the traction mechanism. The present invention solves the technical problems that may be faced when using a soil fertility adding device in large-scale agriculture through well-designed components and coordinated work, and improves the uniformity and efficiency of fertilization.

The application provides a flow distribution method and device, equipment and a storage medium. The method comprises the following steps: every preset time length, a plurality of central processing units (CPUs) currently specified by a storage performance development kit (SPDK) iSCSI service are acquired. When a new flow connection appears, according to the current load coefficient of each CPU, the flow connection is distributed to the CPU with the minimum current load coefficient. When no new flow connection appears, according to the current load coefficient of each CPU, the flow connection connected to the CPU corresponding to the maximum load coefficient is migrated to the CPU corresponding to the minimum load coefficient. The application improves the balance of flow distribution on the CPU.

The utility model relates to a coordinated water replenishing system for multi-area water supply, which belongs to the technical field of coordinated water supply and comprises a coordinated control system for adjusting area water supply, an area water storage tank for storing water for a single area and a water supply pipeline system for supplying water to the area water supply tank, the water supply pipeline system comprises a water source water supply pipe connected with an external water source, a regional water supply pipe communicated with the water source water supply pipe and a main water supply regulating valve, the regional water supply pipe is communicated with the regional water storage tank, and the main water supply regulating valve is installed on the regional water supply pipe; the coordination control system comprises a transmission controller and a water source flow meter, and the water source flow meter and the main water supply adjusting valve are both electrically connected with the transmission controller. The method has the effect of improving the balance of multi-region water supply.

The invention relates to a communication control method of a communication system and the communication system. Acquiring historical communication data of the LED display screen and display control data to be sent; under the condition that the communication coding proportion of the historical communication data does not meet the preset coding proportion, determining a proportion exception type corresponding to the communication coding proportion; performing code conversion on the to-be-sent display control data according to the proportion exception type to obtain a target code; and performing communication control on a driving circuit corresponding to the LED display screen according to the target code. By analyzing the communication coding proportion of the historical communication data in real time, the display control data to be sent can be subjected to corresponding code conversion in time to obtain the target code, so that the balance of the communication coding proportion is improved, the problem of poor communication stability of a communication system caused by imbalance of the coding proportion in the prior art is effectively avoided, and the user experience is improved. And the stability of the communication process of the communication system is improved.

The utility model discloses an efficient plastic extruder which comprises an extruder main body and a feed hopper and is characterized by further comprising a fixing frame, the fixing frame is formed by welding a plurality of rods, a mounting ring is fixedly arranged on the outer wall of the feed hopper in a surrounding mode, an inserting column is fixedly arranged at the position, located at the bottom of each rod, of the fixing frame, and the fixing frame is detachably installed on the mounting ring through the inserting columns. A motor is fixedly arranged in the middle of the top of the fixing frame, the output end of the motor is fixedly connected with a stirring shaft and extends into the feeding hopper, a plurality of inner stirring rods are fixedly and annularly arranged on the outer wall of the stirring shaft and evenly arranged in the axial direction of the stirring shaft, a mandrel is arranged at the bottom of the stirring shaft, and spiral blades are fixedly and spirally arranged on the outer wall of the mandrel. Through the arrangement of the motor, the stirring shaft and the inner stirring rod, raw materials entering the feeding hopper can be uniformly mixed, so that the balance of plastics is improved, and through the arrangement of the core shaft and the spiral blade, the feeding speed can be ensured while the raw materials are prevented from being blocked, and the production efficiency of the plastic extruder is ensured.

The utility model discloses steam heating constant-temperature formation equipment, which relates to the technical field of lithium battery production detection equipment and comprises a casing and a steam engine. A constant-temperature cavity and a heating cavity are formed in the machine shell; the heating cavity is provided with a communicating inlet and a communicating outlet which are communicated with the constant-temperature cavity, the communicating inlet is located below the communicating outlet, and the communicating inlet and the communicating outlet are both located on the side, close to the constant-temperature cavity, of the heating cavity; a heating pipe is arranged in the heating cavity, an inlet and an outlet of the heating pipe are communicated with an inlet and an outlet of the steam engine respectively, and the steam engine is used for generating flowing steam; a first exhaust fan set is arranged at the communicating inlet and can blow gas in the heating cavity into the constant-temperature cavity. A plurality of needle bed modules are arranged in the constant-temperature cavity, and a bottom plate frame for placing a lithium battery is arranged below each needle bed module. And the effects of high temperature precision, stable operation and low maintenance cost are achieved.