708results about How to "Reduce test error" patented technology

The invention provides a virtual instrument-based motor control automatic testing system and method for an electric automobile, wherein the system comprises an industrial personal computer and a CAN (controller area network) communication bus connected with the industrial personal computer, a test setting unit, a data processing unit, a result display unit and a database management unit which areall connected with the industrial personal computer, a data collecting unit respectively connected with a motor control circuit to be tested and the industrial personal computer, and a PXI (PCI Extensions for Instrumentation) communication card respectively connected with the industrial personal computer and the CAN communication bus; a programmable power supply is connected with the motor control circuit to be tested; and the motor control circuit to be tested is respectively connected with the data collecting unit and the CAN communication bus. The method comprises the steps of: selecting test items and setting parameters; collecting testing signals; analyzing and processing test data; displaying a testing result; and updating and managing a database. By the automatic testing system andmethod, the function detection and the collecting, processing and storing of the testing data of an electric automobile motor control circuit can be completed automatically; the synchronous sampling of the testing data is ensured; the automatic testing system and method have high testing precision and good the repeatability is good; the testing error is reduced; and the automatic level of the detection is improved.

The invention discloses a device and a method for testing high-temperature complex permittivityes of low-loss dielectric materials, which belongs to the micro-wave, millimeter wave low-loss dielectric materials complex permittivityes testing technique. The testing device comprises a micro wave signal source, a cylinder type high Q resonant cavity, a scalar network analyzer, and a vacuum high-temperature furnace, wherein the cylinder type high Q resonant cavity comprises a cylinder cavity tube, an upper end cover, a lower end cover, and a connecting wave guide, whole resonant cavity adopts thin-wall precious metals to form a cavity, and adopts high-temperature resisting material to form a supporting body. Adoption of the testing device comprises testing a resonating frequency rate of an empty cavity f0 and a non-loading quality factor Q0, and testing the resonating frequency rate f0 epsilon and the non-loading factor Q0 epsilon of a rear resonating cavity of a testing sample of a loading low-loss dielectric under the same high temperature, and calculating out the high-temperature complex permittivityes of the low-loss dielectric materials. The invention has the advantages of wide applying frequency range, high testing temperature, low cost, convenient testing, and little testing error, and is applicable to high temperature tests of the complex permittivityes of the low-loss dielectric materials in each microwave, millimeter wave frequency band range.

The invention belongs to the technical field of electric power systems and particularly relates to a method for electric vehicle load prediction based on an efficiency maximization principle. First a space-time distribution model of electric vehicles is established based on a trip chain, information such as initial departure time, driving destination, driving distance and stopping time is analyzed, and charging space-time distribution of the electric vehicles is obtained. Charging stations most favorable for users are selected based on the efficiency maximization principle to charge the electric vehicles, and finally space-time distribution of electric vehicle charging loads is given. On the basis of the fact that the electric vehicle load prediction by previous scholars is only confined to the time level and the regional level, the method for electric vehicle load prediction based on the efficiency maximization principle is provided, and the load prediction can be detailed to the charging stations.

The invention relates to a method for testing the complex dielectric constant of microwave dielectric material and belongs to the field of microwave testing technology. The method comprises the following steps: firstly, processing the microwave dielectric material to be measured into a rectangular thin slice with two parallel surfaces and simultaneously preparing two dielectric material supporting blocks and two metal conduction strips, then forming a double-sided parallel strip line resonator, inputting a microwave frequency sweep test signal into the double-sided parallel strip line resonator through a coaxial coupling probe, measuring the resonant frequency fr and the loaded quality factors QL after the microwave frequency sweep test signal passes through the double-sided parallel strip line resonator and combing the known parameters (Relevant dimension, complex dielectric constants of the dielectric material supporting blocks and the like) to calculate the complex dielectric constant of the microwave dielectric material to the measured. The method has the advantages of wide working frequency band, small volume of a test device, good mixed mode rejection, small test error and the like and is convenient to use. The invention can realize the wide-scope, accurate and quick noninvasive measurement to the complex dielectric constant of the microwave dielectric material within the scope of each microwave frequency band.

The invention discloses an automatic test system for CAN network and ECU functions. The automatic test system comprises a mainframe, a bus analyzer, a bus interferometer, an oscilloscope, a programmable power supply and a function test board. The mainframe manages the test system in an unified mode, controls the test processes of the whole system concentratedly and achieves automatic tests in which the test processes are performed automatically and test reports are output automatically; the bus analyzer receives, transmits and analyzes bus information; the bus interferometer achieves interference operation on a bus; voltage is converted through the programmable power supply; a multi-path digital oscilloscope is adopted as the oscilloscope, the signal collecting end is connected with the bus or the ECU output end, and the oscilloscope collects waveforms through communication with the mainframe and displays the waveforms in the mainframe to capture information; the function test board simulates input signals needed in the test processes and collects the output signals of the tests. The system has the advantages of improving test efficiency and reducing test errors.

The invention is a method of testing thermal resistance of power LED and its special chip, its main character: using special chip to simulate the designed power LED chip, they have the same structure of extension layer and electrode layer, when using it to make the power LED to be tested, also adopting the same or similar packaging technique to the designed power LED. It can accurately simulate the thermal working characteristic of the designed power LED, by testing and calculating, obtains the thermal resistance without adopting expensive special testing instruments, reducing the development cost of power LEDs.

A multi-core optical fibre and a sensor based on the multi-core optical fibre and a running method therefor. The multi-core optical fibre comprises a transmission fibre core (15) and a plurality of sensing fibre cores (16), the length of the sensing fibre core (16) being not less than the length of the transmission fibre core (15). The sensor based on the multi-core optical fibre comprises a light source module (12), the multi-core optical fibre and optical detector modules (5, 7, 8). The light source module (12) injects optical signals in the transmission fibre core (15). The optical detector modules (5, 7, 8) detect the variation of optical signals in all or a part of the sensing fibre cores (16), eliminate interference through the comparison of the response of more than two sensing fibre cores (16) to the physical quantities to be detected in one and the same position, and improve the test accuracy. Also disclosed is a corresponding running method for the sensor based on the multi-core optical fibre.

The invention relates to a low-permeability reservoir bed starting pressure testing method which comprises the following steps of: placing a core with 0.8-1.5m in length in a core holder with multiple pressure testing points, and applying a confining pressure by simulating oil deposit conditions; vacuumizing the core, and filling the core with formation water until the original oil deposit pore pressure is achieved; setting the pressure of a return pressure valve to be with the pressure value of a designated testing pore fluid; setting the velocity of the formation water passing across a core chamber to be 0.1-1mL / min, gradually reducing the velocity to 0, and recording the pressure difference value between each pressure testing point and a fluid inlet; calculating the starting pressure gradient of the core by using the pressure difference data values between different pressure testing points and the fluid inlet. The calculation formula is GradP=(PAB / LAB+PAC / LAC+......) / n, wherein PAB, PAC ...... represent the pressure differences of section AB, section AC ...... of the core, and n represents the quantity of the pressure testing points. The low-permeability reservoir bed starting pressure testing method has small testing error and can be used for accurately testing the starting pressure under low-permeability reservoir bed oil deposit conditions by simulating oil deposit pressure conditions.

The invention belongs to the technical field of microwaves and millimeter waves, and in particular relates to a method for measuring complex dielectric constants of microwave and millimeter wave dielectric materials. When the method tests the complex dielectric constants of high-temperature dielectric materials by adopting a terminal short-circuit method, two same rectangular test waveguides are connected with a vector network analyzer respectively, and each rectangular test waveguide is formed by connecting a radiating waveguide, a heat insulation waveguide, a high-temperature waveguide and a short-circuit board sequentially; and the method comprises the following steps: firstly, measuring emission coefficients of two waveguides at room temperature; secondly, loading a dielectric sample to be tested in one of the test waveguides; thirdly, measuring the emission coefficients of the two waveguides at high test temperature, and correcting the emission coefficient of the waveguide loaded with the test sample by using the emission coefficient of an empty waveguide to further obtain the complex dielectric constant of the dielectric sample to be tested through calculation. By using the method for measuring the high temperature complex dielectric constants of the dielectric materials, the test error can be reduced so that the precision of the test result is higher; and simultaneously, the method only performs the high-temperature measurement once, so that the test efficiency is greatly improved.

The invention discloses a phase- and time mark measurement-based merging unit (MU) absolute delay detection method. The method comprises the following steps: completing the transformation from electric quantity on the primary side to that on the secondary side through a standard voltage transformer and a standard current transformer, and converting a signal into an analog-digital converted small voltage signal through a high precision converter; triggering and controlling a time sequence through a high precision clock tick, performing high precision acquisition of the small voltage signal, and extracting a fundamental wave signal phase phi 1 which serves as the time when the power frequency analog quantity on the primary side of the MU appears; receiving the digital quantity output of the MU in real time, marking an upper time mark by using the same clock tick, and eliminating shake on the time mark; starting interpolation at the equal sampling rate by using the same trigger signal to obtain new sample data, extracting a fundamental wave signal phase phi 2 which serves as the time when the output port of the MU sends a digital sampling value corresponding to the analog quantity; and obtaining time difference corresponding to the phase difference, and combining the current actual frequency value to convert the phase difference to time, namely the absolute delay of the MU.

A device special for determining stable state thermal resistance of architecture glass which is a necessary determining device for quality control and product acceptance in energy-saving architecture glass produce is provided. The present invention comprises of heat flux sensor, internal and external guarding heat-box, cold-box (including refrigerating unit), precision temperature measurement and computer data collecting process system, and frame mounted rise-and-fall glass carrying stage and vacuum acetabula glass fixation mechanism. The present invention is not only used for detecting state thermal resistance of energy-saving architecture glass such as vacuum glass, hollow glass, and so on, but also used for detecting heat insulation and heat preservation capacity of other plate architecture material such as polystyrene board, steel (aluminium) plastic compound heat preserving board and so on.

The invention discloses a lake water quality evaluation prediction system and method based on a factor weighting model. The method comprises the following steps: through different lake area pollution thermal graph color conditions, knowing each lake pollution contrast; through obtaining lake basin weather indexes, feeding time vector weather temperature information and each weather index to a user; displaying an accomplishment of an improved factor weighting model; and through combination with a correlation analysis algorithm, emitting an alarm to the user for each current standard-exceeding water quality index and prediction standard-exceeding indexes. According to the invention, the factor weighting evaluation model capable of more accurately evaluating water quality is established. Through numerous data tests of the model, it is proved that the algorithm operation efficiency and the water quality evaluation accuracy are greatly improved. A factor weight based evaluation model is established, a future lake water quality and environment development trend is reasonably predicted and analyzed, most visual water quality change and lake area differences can be given to the user, and water supply environment management advice is provided for sustainable development of a nine-like basin.

The invention discloses a real-time performance test method which is applied to real-time performance tests of an embedded system. The real-time performance test method includes following steps: performing time characteristics modeling on application program source codes in an upper computer; using a time characteristics model obtained in the modeling process to complete instrumentation operation for the source codes; downloading the source codes onto a lower computer after the source codes are compiled and interlinked, and starting an application program through the upper computer; collecting test data during the running period of the application program, and returning data stored in a certain data container in real time to the upper computer according to preset transmission rules; obtaining a real-time performance test report of the application program after data analysis. The real-time performance test method achieves the real-time performance tests for the embedded real-time application program, and has the advantages of being fully automatic, small in error and detailed in result during the test process. The invention further discloses a system which uses the real-time performance test method.

The invention provides a handheld wave-absorbing material reflectivity measuring device. The handheld wave-absorbing material reflectivity measuring device comprises a metal test platform, a to-be-measured sample plate or a standard sample plate, a supporting cover, an arched guide rail, a near-field focusing antenna, a wave-absorbing partition plate, sliding blocks, a lifting rod, a push-pull rod and a receiving and transmitting module. According to the handheld wave-absorbing material reflectivity measuring device, the near-field focusing antenna which is a novel double-antipodal structure Vivaldi antenna replaces a horn antenna to serve as a receiving and transmitting antenna, the antenna is small in size and weight, and has the low standing-wave ratio in a wide band, the high gain and the low side lobe characteristic, a near-field linear polarization plane wave can be generated, the far-field radiation environment is simulated on a near field, a test area moves from an antenna far-field area to an antenna near-field area, and test space is reduced; due to reduction of the distance between the to-be-measured sample plate and the antenna, the to-be-measured sample plate can be more intensively irradiated through an electromagnetic wave, and the influence of background reflectance on the test accuracy is reduced; meanwhile, electromagnetic wave incidence and a reflection angle can be accurately adjusted, the accuracy of a receiving-and-transmitting antenna positioning angle is improved, and the complex rate of operation is reduced.

The invention provides a mini three dimensional effective stress box. The mini three dimensional effective stress box is characterized in that a skeleton of the stress box is in an upper-middle-lower structural form; the middle structure is an eight-prism which is formed by means of enclosure of eight squares; the upper and lower structures are formed by five squares or four equilateral triangles; the upper structure and the lower structure are symmetrical with the middle structure; an inclinometer is arranged on any surface of the inner wall of the skeleton; bearing diaphragms are respectively arranged on each surface, with round holes, of the skeleton; a foil gauge is pasted on the inner wall of the round surface which is formed after combination of the bearing diaphragms and the skeleton; and a foil gauge wire and an inclinometer wire are led out through a data wire hole by means of a data wire, and then are connected with a data acquisition instrument so as to form a mini three dimensional effective stress box. And at the same time, the invention also provides a test method of the mini three dimensional effective stress box. The mini three dimensional effective stress box and the test method of the same have the advantages of reducing the error caused by rotation of the mini three dimensional effective stress box, reducing the test error caused by unequal range finding, being able to reflect the bearing state of soil because of improvement of accuracy, improving the safety stock during the soil construction process.

Devices and methods for measuring prothrombin time and hematocrit (HCT%) by analyzing the change in reactance in a sample are presented. A diagnostic device for measuring HCT and prothrombin time of a fluid includes a relative electrode-type sensor device and a blood test card assembly including one or more pairs of electrodes, wherein alternating current (AC) provided by the sensor device is used to measure and calculate prothrombin time and HCT of blood test using the reactance analysis.

The invention discloses a static index testing platform and method for an industrial robot joint decelerator, and the platform comprises a first automatic loading device which comprises an output shaft. One end of a first tension and pressure sensor is connected with the output shaft of the first automatic loading device, and the other end of the first tension and pressure sensor is connected with one end of a first connecting shaft. One end of the first connecting shaft is connected with one end of a force arm, and one end of the force arm is connected with a second connecting shaft. The other end of the force arm is provided with a first displacement sensor and a second displacement sensor, which are used for measuring the displacement of the force arm. According to the invention, the first automatic loading device employs the large transmission ratio of a spiral lifting machine, can achieve a large pushing force, and is compact in structure. The platform is simple and compact in overall structure, is small in size, and can achieve automatic testing. The method can achieve the testing of bending moment rigidity, torsional rigidity, tooth spaces and return difference through the platform, and is high in precision of testing results.

The invention provides a method for accurately positioning fault points of optical cables. The method comprises the following steps: an optical time domain reflectometer is provided; the refracting index of the optical time domain reflectometer is adjusted to be in accordance with that of a tested optical fiber; the optical time domain reflectometer is utilized to accurately measure the relative distance between a fault point and an adjacent joint point, which is defined as the fiber length S1 of the optical fiber, and the surface length Lp of the optical fiber is calculated out according to the fiber length S1 of the optical fiber; and the surface length size Ly of the fault point of the optical fiber is calculated out according to the surface length Lp of the optical fiber. By adopting the method provided by the invention, test errors caused by the reasons, such as inaccurate engineering data, refractivity deviation between an instrument and the optical fiber, and the like, are reduced, long-distance check computation of the length of the optical cable is avoided, the test results are more accurate, and the method is proved to be simple and effective in practical application.

An ultrasonic plasticizing capillary rheometer comprises a frame, a rheological test unit, an ultrasonic vibration apparatus, and a tool head moving and loading unit. The ultrasonic vibration apparatus is provided with an ultrasonic tool head capable of extending into a plasticizing chamber along an axial direction, providing extrusion force for polymer in the plasticizing chamber, and providing ultrasonic wave energy required by the polymer for fusion from a solid state to a liquid state. In the ultrasonic plasticizing capillary rheometer, three steps including heating fusion, ultrasonic vibration for fluidity increase, and material extrusion are completed through the ultrasonic tool head and in the plasticizing chamber, thereby simplifying the conveying path. A heating ring providing the required initial temperature for the plasticizing process sleeves a material canister, provides a constant material canister temperature for the rheometer, and reduces the test error. A filter screen is arranged in the material canister, centralizes fused polymer, and improves the test accuracy. During a test process, a viscosity test method is accurate in heating, short in fusion time, and wide in application range, is slightly affected by the external environment, and can provide viscosity data high in accuracy.

The invention provides a soil consolidation detector of using weight and air pressure combined loading and a detection method. The soil consolidation detector is suitable for the technical field of property detection of soil and especially suitable for remolded soil consolidation process testing and consolidation process testing of natural soil with relatively high moisture content. The soil consolidation detector comprises a reaction frame, a weight loading device, a weight and air pressure loading conversion device, a sensing measurement device, a consolidation container and an air source pressure controller; after weight loading and forming of a certain settlement amount, upper counter-force is formed through an adjusting nut and a conversion accessory; an air pressure loading device is started to push the consolidation container to ascend to gradually replace a weight load; air pressure is applied to pre-determined consolidation pressure; and the deformations of soil samples in the weight loading process and the air pressure loading process are automatically switched and observed and the soil consolidation quality is recorded and controlled through two groups of sensors on the sensing measurement device. The soil consolidation detector is relatively high in accuracy and convenient to operate; and soil which is uniform in property and high in strength and has different soil consolidation degrees can consolidated under a high load condition.

The invention discloses a device and a method for testing the buoyant force of a buried pipeline. The device and the method are capable of accurately measuring the buoyant force of the pipeline in soil; an annular flexible filler material is arranged on the surface of the sealing steel plate of a pipeline model, so that the frictional force between the pipeline model and a test tank and the test error can be effectively reduced, and a rock-soil body model also can be effectively prevented from entering the gap between the sealing steel plate of the pipeline model and the wall of the test tank, thereby reducing the influence of the boundary effect and guaranteeing the test to be performed under the plane strain condition; glass side surfaces are formed on the test tank so that the displacement deformation conditions of the pipeline model and the rock-soil body can be effectively observed; and the displacement deformation of the pipeline and the soil body can be quantitatively analyzed by the particle image velocity measurement method.

The invention discloses an indicating light optical state automatic test method and system. The method includes the following steps that: 1) images of an indicating light is acquired in real time with preset acquisition rate when tested equipment is in a designated work status; 2) image processing is performed on each frame of acquired image, and corresponding lit and extinguished states of the indicating light in each frame of image are identified; 3) the lasting time of the lit state or the extinguished state and the frequency of flickering states formed by the alternation of the lit state or the extinguished state are calculated, so that an optical state detection result of the indicating light can be obtained; and 4) the optical state detection result is compared with a preset optical state, and whether the optical states of the indicating light accord with design requirements is judged according to a comparison result. The system includes a corresponding image acquisition module, an image processing and identification module, an optical state detection module and a test result analysis module. The indicating light optical state automatic test method and system of the invention have the advantages of simplicity in realization and high accuracy of test results. With the indicating light optical state automatic test method and system adopted, the optical state of the indicating light can be tested directly.

The invention discloses a multi-channel intelligent optical testing device which comprises a light source, a light source control circuit, a wavelength calibration monitoring module and an optical switch which are sequentially connected. One output end of the optical switch is sequentially connected with a polarization controller, a 2*2 shunt and a 1*N optical splitter. One output end of the 2*2 shunt is connected with a first optical power detector, and one input end of the 2*2 shunt is connected with a second optical power detector. The other output end of the optical switch is connected with an N*N shunt, and output ends of the N*N shunt are connected with array optical power detectors in a one-to-one correspondence mode. The light source control circuit, the wavelength calibration monitoring module, the optical switch, the polarization controller, the first optical power detector, the second optical power detector and the array optical power detectors are connected with a control unit. The testing device can test optical indexes of a multi-channel module.

The invention provides an indoor heat environment comfort evaluation thermal manikin system and an indoor heat environment comfort evaluation method. The indoor heat environment comfort evaluation thermal manikin system comprises a thermal manikin, a measuring and control system and an evaluation system. The thermal manikin has good joint motion capability, and has 16 independent measuring and heating control split regions; the split regions sufficiently consider the physiological structure characteristics of a human body and the heat exchange characteristics of the human body in the heat environment with the environment. The indoor heat environment comfort evaluation thermal manikin system has the advantages that the application range is wide; the system can be applied to heat environment in various fields such as civil use, military use, aero-space and navigation; the heat environment parameters can be directly and accurately measured; the heat environment comfort can be objectively evaluated; the test and the evaluation result is stable and accurate; the repeatability is high; the indoor heat environment comfort evaluation thermal manikin system conforms to the real human body heat state; the reasonableness and the reliability are realized.

The invention relates to the technical field of chlorine dioxide disinfection sterilization, in particular to a method for evaluating a chlorine dioxide release rate. The method provided by the invention comprises the following steps: firstly forming a colorimetric card showing one-to-one correspondence between chlorine dioxide release rates and color spots, then detecting color spots of to-be-evaluated samples in the same test environment and comparing with the colorimetric card, thus the chlorine dioxide release rates of the to-be-evaluated samples can be directly read according to the colorimetric card. The method provided by the invention has the advantages that the to-be-evaluated samples only need to be placed in a test container for preset time after a color spot-release rate colorimetric card is formed, then chromogenic reaction is performed by using wet potassium iodide test paper, and reading is performed by comparing the colorimetric card, so that operation is simple and easy; and especially when the chlorine dioxide release rate of a to-be-evaluated sample needs to be tracked for a long time, only simple potassium iodide test paper chromogenic reaction and comparison with a pre-prepared color spot-release rate colorimetric card need to be performed, so that evaluation work is greatly simplified and evaluation efficiency is improved. The method provided by the invention is easy to operate, low in cost and quick in result and is applicable to popularization and application.

The embodiment of the invention discloses a method and device for detecting the automatic sample injection of a laboratory liquid. The method disclosed by the embodiment of the invention comprises the following steps: controlling a microprocessor to enable a driving pump to enhance the positive pressure or negative pressure of a pipeline by extracting the gas in a connecting pipe and a cuvette; finishing the steps of sampling color comparison, liquid drainage, moistening and cleaning under the condition that no manpower participates in the operation; and regulating and controlling the on-off action of the corresponding valves when each operation is carried out. In the embodiment of the invention, the testing course is simple and rapid; and moreover, the control of the microprocessor is matched with the slow liquid injection and air exhaust action of the driving pump and the accurate monitoring of a liquid height detector for the liquid injection height of the connecting pipe, thereby overcoming the defects of air bubbles and water blockage because of the existing artificial liquid pouring and realizing the purposes of greatly reducing testing errors and reducing reagent water source waste.

The invention belongs to the field of electric power system operation and dispatch and relates to a power-grid double-layer optimized dispatching method considering large-scale electric automobile access. Charging and discharging strategies of electric automobiles are researched from two aspects of a power transmission network and a power distribution network, the optimal charging time of the electric automobiles is determined through the power transmission network, further the optimal charging positions of the electric automobiles in the power distribution network are guided, and the load of the power distribution network is centralized on a certain node of the power transmission network, as shown in figure 1. In the power-grid double-layer optimized dispatching method, the coordination effect of wind power, basic load, a thermal generator set and charging and discharging of the electric automobiles is further considered comprehensively, and effective suggestions are proposed for the charging and discharging time and positions of the electric automobiles by means of a model.

The disclosed stripline resonator comprises two parallel metal ground plates 4, an inner conductor 5 between two plates 4, a metal short-circuit board 6 connected to with two ends of plate 4, and two coupling loops 7 on proper position of connected part of plate 4 and conductor 5 for input / output of microwave signal. The electromagnet parameter testing device for microwave film material comprises: a microwave signal source 1, a stripline resonator 2 with broad work frequency and small volume and testing error, and a SNA 3. This device can test the parameters in different microwave frequency range.

A lithium battery internal short circuit test method concretely comprises the following test steps of S1 fixing a lithium battery in a fixing clamp; S2 controlling the temperatures in a box body and in a fixing gauge; S3 using a controller to control an extruding device and simultaneously extruding a lithium battery housing slowly from a plurality of directions; S4 using the controller to acquire the temperature change information, the voltage change information of the lithium battery and the displacement information of a test probe of the extruding device; S5 observing the change of the extruded points of the lithium battery and combining the lithium battery information acquired by the controller to analyze, and determining the safety of the lithium battery. The lithium battery internal short circuit test method of the present invention is strong in practicality and high in test accuracy, can test the internal short circuit working conditions of the lithium battery more comprehensively, enables the test errors and the temperature difference to be reduced and a test effect to be improved, effectively avoids the situation that the test data is not accurate due to the temperature difference between the temperature of the lithium battery and an actual temperature, so that the test and the evaluation of the safety of the lithium battery are influenced, saves the energy consumption, and avoids the situation that the heat energy entering the box body is concentrated relatively to thereby influence the test effect.