Electric vehicle portable needle stick trigger device and method of use

Abstract

A portable needle puncture trigger device for electric vehicles and a use method thereof belong to the technical field of fire experiment. The striker is positioned in the striker seat; the needle puncture trigger device is pushed to the bottom of the electric vehicle; the angle of the striker is adjusted to make the striker aim at the point position of the battery pack that needs to be punctured; the hydraulic lifting foot is extended to contact the ground by pressing the lifting switch down key; the hydraulic rod drives the striker to pierce into the battery pack by pressing the up key on the remote controller; the hydraulic rod drives the striker seat to separate from the striker by pressing the down key on the remote controller; the needle puncture part is continuously observed to see if there is smoke or fire phenomenon; when the fire at the bottom of the battery pack cannot be controlled, the hydraulic lifting foot is retracted from the ground by pressing the lifting switch up key; the four wheels contact the ground; the needle puncture trigger device is timely withdrawn from the scene through the cable; the camera continuously monitors the needle puncture process and stores the needle puncture process through the monitoring host; and the above steps achieve the purpose of triggering the thermal runaway of the electric vehicle through mechanical abuse and monitoring the phenomenon of the thermal runaway process.

Description

TECHNICAL FIELD

[0001] The application relates to a portable needle puncture triggering device for an electric vehicle and a use method thereof, and belongs to the technical field of fire experiment. BACKGROUND

[0002] Developing new energy vehicles is the only way for China to become a powerful country in the automobile industry. In recent years, the sales and ownership of new energy vehicles in China have continued to rise, but the number of new energy vehicle fires has also increased, which not only poses a serious threat to public life and property safety, but also restricts the healthy development of the new energy vehicle industry. Therefore, carrying out electric vehicle whole vehicle combustion experiment research is an important means to excavate the safety design defects of electric vehicles and improve the intrinsic safety.

[0003] According to statistics, among the reasons for new energy vehicle fires, the proportion of fires caused by traffic accidents or chassis collisions is 15.38%, which is only second to the proportion of 32.97% caused by battery faults. Such mechanical misuse faults are sudden and serious when they are serious, and have certain concealment and hysteresis when they are mild. The vehicle parking or running scene after a minor accident is complex, and the fire hazard is great. Therefore, carrying out electric vehicle whole vehicle fire recurrence experiment and quantitatively evaluating the potential hazards of electric vehicles under mechanical misuse working conditions is an important prerequisite for improving the safety performance of electric vehicles and ensuring the stable development of the new energy vehicle industry.

[0004] Current mechanical misuse faults of electric vehicles are mainly triggered by needle puncture, that is, a steel needle is used to pierce into the battery pack to trigger the thermal runaway of single battery cell, and then the heat spread suppression ability of the battery system and the effectiveness of the protection design are evaluated. However, the existing needle puncture triggering device has significant technical bottlenecks: first, the existing needle puncture triggering device is generally bulky and inconvenient to move and place, and is mostly used in fixed laboratories or experimental benches. In limited space scenes such as garages, stereo parking racks, tunnels, etc., the device deployment is difficult, and the multi-angle loading is limited. Second, due to the high price of the needle puncture equipment, in order to avoid burning loss, a high-temperature protection cabin is often added during the experiment, which results in a large observation blind area of the needle puncture point, making it difficult to effectively capture the key evolution process of the whole vehicle fire caused by mechanical misuse. At the same time, once the equipment is burned, the experimental cost will increase sharply, and the continuity of the experimental research will be seriously affected.

[0005] For example, the invention patent with application number 202510288140.1 "A vehicle bottom needling equipment" can realize fixed-point needling of the vehicle bottom, but it needs to be used with the bottom plate and the ground rail, and it is difficult to be flexibly applied to specific scenes such as closed garages and stereoscopic vehicle storage frames, and the steel needle can only be vertically pierced, and cannot be pierced at multiple angles to simulate different damage levels of the battery pack. The invention patent with application number 202510288141.6 "A vehicle needling detection system" adds a water immersion pool and related structures under the experimental bench to improve safety, but still faces the problems of large facility size and inability to load at multiple angles, and further increases the observation blind area of the experiment. The invention patent with application number 202210545382.0 "A battery pack needling test device" solves the technical problem that batteries with different puncture positions need to match different needling equipment, and can use one set of equipment to realize puncture of the front, back, left and right side walls of the battery pack, but the steel needle can only be horizontally pierced and cannot adjust the piercing angle, and the experimental subject is a battery pack, which does not meet the demand of puncturing the whole vehicle to evaluate the safety performance of the whole vehicle.

[0006] Therefore, it is necessary to develop a portable needling trigger device for electric vehicles, which adopts miniaturization and integration design to reduce the size and cost of the device, so that it can be applied to a wider range of application scenarios, and a needling angle adjusting device is designed to overcome the defect that the existing device cannot be pierced at multiple angles. SUMMARY

[0007] In view of the problems of difficult deployment in limited space scenes, limited multi-angle loading of the impact needle, high experimental cost, and large monitoring blind area in the prior art, the present application provides a portable needling trigger device for electric vehicles and a use method, which adopts integrated and modular design to effectively reduce the size and cost of the device, and uses the outer box, the rotating main box, the turbine assembly, and the worm assembly to realize multi-angle loading of the impact needle. The camera is arranged in the main box cover to monitor the failure phenomenon of the needling point at close range, which expands the mechanical abuse trigger scene of electric vehicles, reduces the experimental cost, and realizes simulation of different failure levels of the battery pack by adjusting the needling angle, thereby providing an effective failure trigger means for quantitative evaluation of fire hazards in the mechanical abuse working condition of electric vehicles in multiple scenes.

[0008] The technical scheme adopted by the present application is: a portable needle pricking trigger device for electric vehicles, comprising an electric hydraulic jack, a stepping servo motor, a camera, a monitoring host and a hydraulic power assembly, the hydraulic power assembly comprising a hydraulic power unit, an oil inlet synchronous motor, an oil return synchronous motor, four hydraulic lifting feet in side flange oil cylinders, a lifting switch and a starting switch, further comprising an outer box, a rotating main box, a main box cover, a turbine assembly, a worm assembly, a striker seat, a striker, a camera support and a wheel; the outer box is provided with the worm assembly, the rotating main box is provided with the turbine assembly, the rotating main box is arranged in the outer box and connected with the outer box through the turbine assembly, the threads of the worm assembly are engaged with turbine teeth of the turbine assembly, the camera support and the electric hydraulic jack are respectively fixed on the rotating main box, the camera is fixed on the camera support, the striker seat is fixed on the electric hydraulic jack, and the striker is arranged in the striker seat;

[0009] The hydraulic power unit, the oil inlet synchronous motor, the oil return synchronous motor and the stepping servo motor are respectively fixed on the outer box, and the stepping servo motor is connected with the worm assembly;

[0010] The outer box is provided with four wheels and four hydraulic lifting feet at the lower end, the hydraulic power unit is connected with the four hydraulic lifting feet through the oil inlet synchronous motor and the oil return synchronous motor, and the lifting switch and the starting switch are connected with the hydraulic power unit;

[0011] The rotating main box can rotate to the left or to the right in the outer box, and the rotating angle is 0-45 degrees;

[0012] The electric hydraulic jack moves the striker up and down through a remote controller;

[0013] The camera communicates with the monitoring host wirelessly.

[0014] Further comprising a main box cover, the main box cover is fixed on the rotating main box, and the camera and the striker respectively extend out of the main box cover.

[0015] The rotating main box is arranged in the outer box and connected with the outer box through the turbine assembly, and the specific structure is that the turbine assembly comprises a worm shaft, a turbine, a turbine fastening flange, a pressure bearing, a bearing, a fastening nut and a fixed flange; one fixed flange is respectively fixed on the inner side of a worm shaft hole of two main walls II, and the centers of the fixed flanges are respectively coaxial with the worm shaft hole; one bearing is respectively arranged in a bearing hole of two main walls I of the outer box; the turbine is fixed on one side of the shaft block of the worm shaft, and the turbine fastening flange is fixed on the other side of the turbine; one end of the worm shaft is screwed together in sequence through one fixed flange, a worm shaft hole of one main wall II, one pressure bearing, one bearing and one fastening nut; the other end of the worm shaft is screwed together in sequence through the other fixed flange, a worm shaft hole of the other main wall II, the other pressure bearing, the other bearing and the other fastening nut.

[0016] The outer box is provided with a worm assembly, and the specific structure of the worm assembly is that the worm assembly comprises a worm, a tapered roller bearing, a fastening nut, a coupling and an outer sleeve;

[0017] Two outer sleeves are respectively fixed in the outer sleeve grooves on the two side walls of the outer box, and one tapered roller bearing is arranged in each of the two outer sleeves; the worm is provided with threads, one end of the worm is screwed through the worm hole in one side wall of the outer box, one tapered roller bearing, one fastening nut and the coupling in sequence, and the other end of the worm is screwed through the worm hole in the other side wall of the outer box, the other tapered roller bearing and the other fastening nut together.

[0018] The specific connection structure of the striker seat, the electric hydraulic jack and the striker is that the hydraulic rod of the electric hydraulic jack is arranged in the hydraulic rod blind hole of the striker seat and is fixed on the striker seat through a split pin, the striker vertical surface II corresponds to the striker blind hole vertical surface I, the striker is inserted into the striker blind hole of the striker seat, the plunger ball is embedded in the plunger ball hole, and the striker is positioned in the striker seat by cooperation of the ball head of the plunger ball and the circular concave groove on the striker vertical surface II.

[0019] A use method of the portable needle puncture triggering device of the electric vehicle, and the steps are as follows:

[0020] Step 1, according to the experimental needs, the striker with a sharp head or a straight head is selected and positioned in the striker seat;

[0021] Step 2, the experimental electric vehicle is placed on the vehicle rack, and the needle puncture triggering device is pushed to the bottom of the electric vehicle;

[0022] Step 3, according to the damage degree of the battery pack to be simulated, the angle of the striker is adjusted so that the striker is aimed at the point of the battery pack to be punctured;

[0023] Step 4, the lowering key of the lifting switch is pressed, the hydraulic lifting foot is extended to contact the ground, and the needle puncture triggering device is stably positioned at the bottom of the electric vehicle;

[0024] Step 5, the rising key of the remote controller is pressed, the electric hydraulic jack is started, the hydraulic rod drives the striker to pierce into the battery pack, when the piercing length meets the experimental needs, the pause key of the remote controller is pressed, the hydraulic rod stops rising, the lowering key of the remote controller is pressed again, the hydraulic rod drives the striker seat and the striker to separate, the needle puncture part is continuously observed to see whether there is smoke or fire, when the fire at the bottom of the battery pack cannot be controlled, the lifting switch is pressed to raise the key, the hydraulic lifting foot is retracted to separate from the ground, and the four wheels contact the ground, the cable connected with the traction ring timely removes the needle puncture triggering device from the scene;

[0025] The camera continuously monitors the needle puncture process, stores the needle puncture process through the monitoring host, and outputs the picture of the needle puncture part in real time through the display;

[0026] The purpose of triggering the thermal runaway of the electric vehicle by mechanical abuse and monitoring the thermal runaway process phenomenon is achieved through the above steps.

[0027] The technical effects of the present application are: (1) The miniaturization and integrated structure design of the needle trigger device reduce the production cost and are suitable for various limited space scenarios, and realize the reproduction of electric vehicle fire accidents caused by mechanical abuse in multiple scenarios, providing data basis and technical support for improving the safety performance of electric vehicles in all scenarios and all fault conditions.

[0028] (2) The outer box is provided with a worm assembly, the rotating main box is provided with a turbine assembly, the worm thread is engaged with the worm gear, and the plane angle of the rotating main box is changed to adjust the needle angle of the needle into the battery pack. By changing the angle of the needle into the battery pack, different degrees of mechanical abuse damage are simulated. The stepping servo motor has a self-locking structure to ensure that the needle can penetrate the battery pack at different angles and ensure that the plane angle of the rotating main box does not change.

[0029] (3) The needle seat is provided with a vertical surface I, and the needle is provided with a vertical surface II, which can ensure that the sharp needle or the one-head needle is quickly inserted into the needle seat. The ball head of the plunger ball and the circular groove structure design on the vertical surface II of the needle can ensure the lifting stroke of the hydraulic rod of the electric hydraulic jack. The needle is pushed into the battery pack through the needle seat, and when the hydraulic rod of the electric hydraulic jack descends, the needle and the needle seat can be separated, preventing the needle from being stuck in the battery pack and the needle trigger device from being removed in time.

[0030] (4) The outer box is provided with wheels, hydraulic lifting feet and a traction ring. The wheels are used for the movement of the needle trigger device, the hydraulic lifting feet are used to ensure the stability and accuracy of the needle into the battery pack, and the hydraulic lifting feet can be quickly lifted off the ground when the electric vehicle thermal runaway catches fire during the test, so that the wheels contact the ground. Through the cable connected with the traction ring, the needle trigger device is removed from the scene in time to protect the needle trigger device from being burned out.

[0031] (5) A camera is arranged on the rotating main box to record the whole process of the needle into the battery pack at close range, and the image is transmitted to the monitoring host through WIFI. The whole process of the needle can be recorded and transmitted to obtain more effective data.

[0032] (6) The outer box, the rotating main box and the main box cover are made of fireproof materials to realize protection after the vehicle bottom thermal runaway catches fire. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 The main structure diagram of the needle trigger device of the present application is realized.

[0034] Figure 2 The structure diagram of the needle trigger device without the main box cover of the present application is realized.

[0035] Figure 3 The cross-sectional view of the needle trigger device of the present application;

[0036] Figure 4 The side view of the structure; Figure 3 The A-A cross-sectional view of the structure;

[0037] Figure 5 The specific connection structure diagram of the striker seat, the electric hydraulic jack and the striker of the present application;

[0038] Figure 6 The structure diagram of the outer box of the present application;

[0039] Figure 7 The side view of the structure; Figure 6 The side view of the structure;

[0040] Figure 8 The structure diagram of the rotating main box of the present application;

[0041] Figure 9 The side view of the structure; Figure 8 The side view of the structure;

[0042] Figure 10 The structure exploded diagram of the striker seat of the present application;

[0043] Figure 11 The top view of the circular flange of the present application;

[0044] Figure 12 The structure diagram of the pointed striker of the present application;

[0045] Figure 13 The structure diagram of the straight head striker of the present application;

[0046] Figure 14 The block diagram of the step servo motor control circuit for realizing the present application;

[0047] Figure 15 The structure diagram of the hydraulic power assembly for realizing the present application;

[0048] Figure 16 The embodiment diagram of the present application.

[0049] In the diagram: 1. Outer casing; 1-1. Main wall I; 1-1-1. Bearing hole; 1-2. Side wall; 1-2-1. Outer groove; 1-2-2. Worm hole; 1-3. Lower plate I; 1-4. Motor frame; 1-5. Hydraulic power unit frame; 1-6. Traction ring; 2. Rotating main casing; 2-1. Top cover; 2-2. Main wall II; 2-2-1. Worm gear shaft hole; 2-3. Lower plate II; 3. Main casing cover; 4. Turbine assembly; 4-1. Worm gear shaft; 4-1-1. Shaft stop; 4-2. Turbine; 4-3. Turbine fastening flange; 4-4. Pressure bearing; 4-5. Bearing; 4-6. Fastening nut; 4-7. Fixed flange; 5. Worm assembly; 5-1. Worm; 5-1-1. Thread; 5-2. Circular 5-3 Tapered roller bearing; 5-4 Fastening nut; 5-5 Coupling; 5-6 Outer sleeve; 6-7 Strike pin seat; 6-1 Circular flange; 6-1-1 Strike pin blind hole; 6-1-11 Vertical surface I; 6-1-2 Plunger ball hole; 6-1-3 Hydraulic rod blind hole; 6-1-4 Cotter pin hole; 6-2 Plunger ball; 6-3 Cotter pin; 7 Strike pin; 7-1 Vertical surface II; 7-1-1 Circular groove; 8 Camera bracket; 9 Wheel; 10 Hydraulic power unit; 10-1 Hydraulic lifting foot; 11 Electric hydraulic jack; 11-1 Hydraulic rod; 11-2 Remote control; 12 Stepper servo motor; 13 Camera; 14 Monitoring host; 15 Electric vehicle; 16 Cable. Detailed Implementation

[0050] like Figures 1 to 15 As shown, a portable needle-punch triggering device for electric vehicles includes an outer casing 1, a rotating main casing 2, a main casing cover 3, a turbine assembly 4, a worm gear assembly 5, a striking pin seat 6, a striking pin 7, a camera bracket 8, a wheel 9, an electric hydraulic jack 11, a stepper servo motor 12, a camera 13, a monitoring host 14, and a hydraulic power assembly. The hydraulic power assembly includes a hydraulic power unit 10, an oil inlet synchronous motor, an oil return synchronous motor, hydraulic lifting feet 10-1 in four side flange cylinders, a lifting switch, and a start switch.

[0051] The two side walls 1-2 and the lower plate I 1-3 of the outer box 1 are bolted with one main wall I 1-1 respectively, and the other main wall I 1-1 is to be installed, ensuring the smooth installation of the subsequent worm assembly 5; the upper cover 2-1 and the lower plate II 2-3 of the rotating main box 2 are bolted with one main wall II 2-2 respectively, and the other main wall II 2-2 is to be installed, ensuring the smooth installation of the subsequent turbine assembly 4, an outer sleeve 5-5 is fixed in the outer sleeve groove 1-2-1 of the two side walls 1-2 of the outer box 1 respectively through bolts; the rotating main box 2 is placed in the outer box 1, the worm 5-1 is arranged on the upper end of the lower plate II 2-3 of the rotating main box 2 in the outer box 1, one end of the worm 5-1 is extended out of the hole of the outer sleeve 5-5 through the worm hole 1-2-2 of one side wall 1-2 from the outer box 1, the other end of the worm 5-1 is extended out of the hole of the outer sleeve 5-5 through the worm hole 1-2-2 of the other side wall 1-2 from the outer box 1, a tapered roller bearing 5-2 is sleeved on the worm 5-1 extended out of the two outer sleeves 5-5 respectively, the two tapered roller bearings 5-2 are embedded in the two outer sleeves 5-5 respectively, the tapered roller bearing 5-2 is tightly matched with the outer sleeve 5-5, a fastening nut 5-3 is screwed on the worm 5-1 extended out of the two tapered roller bearings 5-2 respectively, the two fastening nuts 5-3 are tightly attached to the two tapered roller bearings 5-2, locked on the worm 5-1, ensuring the stability of the clockwise or counterclockwise rotation of the worm 5-1; the shaft of the stepping servo motor 12 fixed on the motor rack 1-4 of the outer box 1 is connected with the worm 5-1 extended with a fastening nut 5-3 through a coupling 5-4.

[0052] The turbine 4-2 is sleeved on the worm shaft 4-1, the turbine 4-2 is fixed on the worm shaft 4-1 through the key on one side of the shaft block 4-1-1, the turbine fastening flange 4-3 is screwed on the worm shaft 4-1 and tightly matched with the turbine 4-2, one fixed flange 4-7 is sleeved on the worm shaft 4-1 on both sides of the turbine 4-2, the worm shaft 4-1 with the turbine 4-2 fixed thereon is arranged on the upper end of the worm 5-1 in the rotating main box 2, one end of the worm shaft 4-1 passes through the worm shaft hole 2-2-1 of one main wall II 2-2 of the rotating main box 2, one pressure bearing 4-4, one bearing 4-5 in the worm hole 1-2-2 of one side wall 1-2 of the outer box 1 in sequence, and is screwed together with one fastening nut 4-6, the other end of the worm shaft 4-1 passes through the worm shaft hole 2-2-1 of the main wall II 2-2 to be installed of the rotating main box 2, one pressure bearing 4-4, one bearing 4-5 in the worm hole 1-2-2 of the side wall 1-2 to be installed of the outer box 1 in sequence, and is screwed together with the other fastening nut 4-6, the bearing 4-5 and the worm hole 1-2-2 are in a tight fit relationship, the main wall II 2-2 to be installed is fixed together with the upper cover 2-1 and the lower plate II 2-3 of the rotating main box 2 through bolts, forming a complete rotating main box 2, the side wall 1-2 to be installed is fixed together with the two side walls 1-2 and the lower plate I 1-3 of the outer box 1 through bolts, forming a complete outer box 1, the two fixed flanges 4-7 sleeved on the worm shaft 4-1 are fixed in the inner side of the worm shaft hole 2-2-1 of the two main walls II 2-2 of the rotating main box 2 through bolts respectively, the tightness of the two fastening nuts 4-6 is adjusted, the two fastening nuts 4-6 are pressed on the two bearings 4-5 respectively, and the turbine 4-2 is ensured to be engaged with the thread 5-1-1 of the worm assembly 5, and the rotating main box 2 in the outer box 1 can rotate stably to the left or to the right by 0-45 degrees.

[0053] The camera support 8 and the electric hydraulic jack 11 are fixed on the upper cover 2-1 of the rotating main box 2 respectively, the camera 13 is fixed on the camera support 8, the hydraulic rod 11-1 of the electric hydraulic jack 11 is arranged in the hydraulic rod blind hole 6-1-3 of the striker seat 6, the split pin 6-3 is sequentially arranged through the split pin hole 6-1-4 on one side of the striker seat 6, the hydraulic rod hole and the split pin hole 6-1-4 on the other side, the striker seat 6 is fixed on the hydraulic rod 11-1, the vertical surface II 7-1 of the striker 7 is corresponded to the vertical surface I 6-1-11 of the striker blind hole 6-1-1, then the striker 7 is inserted into the striker blind hole 6-1-1 of the striker seat 6, the plunger ball 6-2 is embedded in the plunger ball hole 6-1-2, the striker 7 is positioned in the striker seat 6 by the cooperation between the ball head of the plunger ball 6-2 and the circular recess 7-1-1 on the vertical surface II 7-1 of the striker 7, and the striker 7 can be inserted and replaced at any time; the hydraulic power unit 10, the oil inlet synchronous motor and the oil return synchronous motor are respectively arranged on the hydraulic power unit rack 1-5, the main box cover 3 is fixed on the rotating main box 2 by bolts, the camera 13 and the striker 7 are respectively extended out of the main box cover 3, the four wheels 9 are respectively fixed on the four corners of the lower plate I 1-3 of the outer box 1 by bolts, the four hydraulic lifting feet 10-1 are respectively fixed on the four corners of the lower end of the two side main walls I 1-1 of the outer box 1 by bolts through the side flange oil cylinder, and the camera 13 and the monitoring host 14 realize wireless communication.

[0054] As shown in Figure 6 , Figure 7 , the outer box 1 comprises the main wall I 1-1, the side wall 1-2, the lower plate I 1-3, the motor rack 1-4, the hydraulic power unit rack 1-5 and the traction ring 1-6, the two main walls I 1-1 are respectively fixed with a side wall 1-2 through bolts on the two sides, the lower end of the two main walls I 1-1 and the two side walls 1-2 is fixed with the lower plate I 1-3 through bolts, the motor rack 1-4 is fixed on one side wall 1-2, the hydraulic power unit rack 1-5 and the traction ring 1-6 are respectively fixed on the other side wall 1-2, one bearing hole 1-1-1 is respectively and symmetrically arranged on the two main walls I 1-1, one outer sleeve groove 1-2-1 is respectively and symmetrically arranged on the outer surface of the two side walls 1-2, and the two outer sleeve grooves 1-2-1 are respectively provided with a worm hole 1-2-2.

[0055] As shown in Figure 8 , Figure 9 , the rotating main box 2 comprises the upper cover 2-1, the main wall II 2-2 and the lower plate II 2-3, the upper end of the main wall II 2-2 is rectangular, the lower end is semicircular, the upper end of the two main walls II 2-2 is fixed with the upper cover 2-1 through bolts, the lower plate II 2-3 is fixed between the arc surfaces of the lower ends of the two main walls II 2-2 through bolts, and the two main walls II 2-2 are symmetrically provided with worm gear shaft holes 2-2-1.

[0056] As shown in Figure 10 , Figure 11As shown, the firing pin seat 6 includes a circular flange 6-1, a plunger ball 6-2 and a split pin 6-3, the upper end of the circular flange 6-1 is provided with a firing pin blind hole 6-1-1 and a plunger ball hole 6-1-2 respectively, the firing pin blind hole 6-1-1 is in communication with the plunger ball hole 6-1-2 and the surface of the firing pin blind hole 6-1-1 is a vertical surface I 6-1-11, the lower end of the circular flange 6-1 is provided with a hydraulic rod blind hole 6-1-3 and a split pin hole 6-1-4 respectively, the plunger ball 6-2 is embedded in the plunger ball hole 6-1-2, the ball head of the plunger ball 6-2 extends out of the vertical surface I 6-1-11, and the split pin 6-3 is inserted into the split pin hole 6-1-4.

[0057] As shown in Figure 12 , Figure 13 As shown, the firing pin 7 is a pointed firing pin or a one-character head firing pin, and one side surface of the lower end of the cylindrical body of the firing pin 7 is a vertical surface II 7-1, and a circular groove 7-1-1 is arranged on the vertical surface II 7-1.

[0058] Figure 14 The application is a block diagram of a stepping servo motor control circuit; a programmable servo controller is connected with a stepping servo motor 12 through a stepping servo driver; the programmable servo controller is a touch screen multi-thread programmable controller, which sends instructions to the stepping servo driver through a touch screen, and the stepping servo driver drives the stepping servo motor to run or stop according to the instructions of the programmable controller, so as to control the rotation angle and speed of the stepping servo motor 12; the stepping servo motor 12 drives the turbine assembly 4 to rotate through the worm assembly 5, and the cooperation of the turbine 4-2 and the thread 5-1-1 of the worm assembly 5 enables the rotating main box 2 to rotate leftward or rightward by 0-45 degrees in the outer box 1.

[0059] The stepping servo motor 12 is model ZDM-2HA865-ZM48V, the stepping servo driver is model ZDM-2HA865-ZH48V, and the programmable servo controller is PLC model CM40PAC TC55V, all of which are powered by 48V DC power supply, and the production unit is Beijing Times Super Science and Technology Company;

[0060] The stepping servo motor adds a position feedback device and a closed-loop controller on the basis of the stepping motor, the position feedback device can monitor the position of the stepping servo motor in real time and transmit the feedback signal to the closed-loop controller, the closed-loop controller compares the feedback signal with the expected position and controls the driving current and pulse sequence of the stepping servo motor, so that the stepping servo motor accurately operates according to the expected position and speed.

[0061] As shown in Figure 15The hydraulic power assembly includes a hydraulic power unit 10, an oil inlet synchronous motor, an oil return synchronous motor, four side flange oil cylinders, a lifting switch and a starting switch. The hydraulic power unit includes a hydraulic pump, an electromagnetic reversing valve and an oil tank. The electromagnetic reversing valve P port of the hydraulic power unit is connected with the hydraulic pump and the oil inlet synchronous motor through oil pipes respectively. The electromagnetic reversing valve T port is connected with the oil tank and the oil return synchronous motor through oil pipes respectively. The oil inlet synchronous motor is connected with the four side flange oil cylinders A ports through four oil pipes respectively. The oil return synchronous motor is connected with the four side flange oil cylinders B ports through four oil pipes respectively. The hydraulic pump is connected with the oil tank through an oil pipe. The lifting switch is connected with the electromagnetic reversing valve through an electric wire. The starting switch is connected with the hydraulic pump through an electric wire. The piston in the side flange oil cylinder is a hydraulic lifting foot 10-1.

[0062] The working principle is as follows: pressing the starting switch, the hydraulic pump in the hydraulic power unit works. Pressing the lifting switch to ascend, the electromagnetic reversing valve works. The oil pressurized by the hydraulic pump enters the four side flange oil cylinder A ports through the electromagnetic reversing valve P port and the oil inlet synchronous motor in sequence, drives the hydraulic lifting foot 10-1 (piston) in the four side flange oil cylinders to extend and contact the ground, so that the needle pricking trigger device is positioned stably at the bottom of the electric vehicle 15. At this time, the four wheels 9 are separated from the ground. In the extending process of the hydraulic lifting foot 10-1 (piston) in the four side flange oil cylinders, the hydraulic lifting foot 10-1 (piston) sends the oil in the side flange oil cylinder into the oil tank through the four side flange oil cylinder B ports, the oil return synchronous motor and the electromagnetic reversing valve T port in sequence. Pressing the lifting switch to descend, the oil pressurized by the hydraulic pump is switched to the oil return synchronous motor through the electromagnetic reversing valve P port, enters the four side flange oil cylinder B ports, drives the hydraulic lifting foot 10-1 (piston) in the four side flange oil cylinders to retract and separate from the ground. At this time, the four wheels 9 contact the ground. In the retracting process of the hydraulic lifting foot 10-1 (piston) in the four side flange oil cylinders, the hydraulic lifting foot 10-1 (piston) connects and sends the oil in the side flange oil cylinder into the oil tank through the four side flange oil cylinder A ports, the oil inlet synchronous motor and the electromagnetic reversing valve T port in sequence.

[0063] The hydraulic power unit is a 24v 2.2kw 8L round horizontal electromagnetic 1-way hydraulic power unit, which is installed horizontally. The stroke of the side flange oil cylinder is 200, and the pressure is 3 tons. The types of the oil return synchronous motor and the oil inlet synchronous motor are SRMD1-4M-1M1.

[0064] Hydraulic power unit, side flange oil cylinder, oil return synchronous motor and oil inlet synchronous motor production unit, Sanbang Hydraulic Machinery Co., Ltd. or Ningbo Zhenhai Ailite Hydraulic Parts Co., Ltd. also have the same products; the electric hydraulic jack 11 is a 12-volt lithium-ion battery electric hydraulic jack, the model is PFIAZY; the size is 35*15*15cm, the maximum load is 5T, the lifting range is 154cm, and the remote controller 11-2 is provided; the lifting of the hydraulic rod 11-1 is controlled through the remote controller 11-2, and the lifting of the hydraulic rod 11-1 drives the striker 7 to move up and down.

[0065] The pressure bearing 4-4 is used for isolating the rotating main box 2 and the outer box 1 and removing the axial force of the turbine 4-2; the bearing 4-5 is used for stable rotation of the worm shaft 4-1; and the tapered roller bearing 5-2 is used for supporting and adjusting the tightness and axial force of the worm 5-1.

[0066] As shown in Figure 16 , the example 1 is an example with a striker angle of 0 degrees; a use method of a portable needle puncture triggering device for an electric vehicle: the monitoring host 14, the lifting switch, the starting switch and the programmable controller are respectively arranged in an experimental parking lot scene or an experimental garage outside;

[0067] Step 1: According to the experimental needs, a striker 7 with a one-character head is selected, the vertical surface II 7-1 of the striker 7 is corresponded to the vertical surface I 6-1-11 of the striker connecting seat 6-1, and then the striker 7 is inserted into the striker blind hole 6-1-1, the ball head of the plunger ball 6-2 is arranged in the circular groove 7-1-1 of the vertical surface II 7-1 of the striker 7, and the striker 7 is positioned in the striker seat 6;

[0068] Step 2: The automobile bench is placed in an open space to simulate a ground parking lot scene, the experimental electric vehicle 15 is placed on the automobile bench, and the needle puncture triggering device is pushed to the bottom of the electric vehicle 15;

[0069] Step 3: According to the experimental needs of simulating a slight mechanical abuse fault of the battery pack, the striker 7 is vertically upwardly aligned with the target point of the battery pack, the programmable controller is set to have a striker angle of 0 degrees, the step-by-step servo motor 12 is started through the programmable controller, the step-by-step servo motor 12 drives the worm assembly 5 to rotate, the worm 5-1 is matched with the turbine 4-2 on the worm shaft 4-1 of the turbine assembly 4 through the thread 5-1-1, the rotating main box 2 is rotated in the outer box 1, and the rotating main box 2 is rotated to have a striker 7 with a vertical angle of 0 degrees and aligns with the point to be punctured by the needle of the battery pack;

[0070] Step 4, press the start switch, the hydraulic pump in the hydraulic power unit works, press the lift switch up key, the electromagnetic reversing valve works, the oil of the hydraulic pump is pressed, and the oil of the hydraulic pump is pressed. The electromagnetic reversing valve P port and the oil inlet synchronous motor are sequentially connected to the four side flange oil cylinders A port, drive the hydraulic lifting foot 10-1 (piston) in the four side flange oil cylinders to extend and contact the ground, so that the needle puncture trigger device is stably positioned at the bottom of the electric vehicle 15, and the four wheels 9 are separated from the ground at this time;

[0071] Step 5, press the up key on the remote controller 11-2, start the electric hydraulic jack 11, the hydraulic rod 11-1 drives the firing pin 7 to penetrate into the battery pack through the firing pin seat 6, and when the penetration depth of the firing pin 7 is 15 cm, press the pause key on the remote controller 11-2, stop the hydraulic rod 11-1 from rising, and then press the down key on the remote controller 11-2, the hydraulic rod 11-1 drives the firing pin seat 6 and the firing pin 7 to separate, continuously observe whether there is smoke or fire phenomenon at the needle puncture position, the battery pack continues to smoke after the firing pin 7 is penetrated, but no fire is observed, press the lift switch down key, the oil of the hydraulic pump is pressed through the electromagnetic reversing valve P port to the oil return synchronous motor, enters the four side flange oil cylinders B port, drives the hydraulic lifting foot 10-1 (piston) in the four side flange oil cylinders to retract and separate from the ground, and at this time the four wheels 9 contact the ground, and then the cable 16 connected with the traction ring 1-6 is used to timely withdraw the needle puncture trigger device from the scene, and the experiment is ended;

[0072] The camera 13 continuously monitors the needle puncture process and sends it to the monitoring host 14, the monitoring host 14 stores the needle puncture process, and outputs the needle puncture position picture in real time through the display;

[0073] Through the above steps, the simulation of the electric vehicle slight mechanical abuse fault in the ground parking lot scene is realized, and the quantitative evaluation of the electric vehicle slight mechanical abuse fault fire hazard in the ground parking lot scene can be realized in combination with the first part of the China Automobile Fire Safety Evaluation Regulations - Electric Vehicle Fire Safety Evaluation Regulations.

[0074] In example 2, the angle of the firing pin is 15 degrees, and the use method of the portable needle puncture trigger device of the electric vehicle is as follows: step 1, select a firing pin 7 with a one-character head according to the experimental needs, and the specific installation steps are the same as those of step 1 of example 1;

[0075] Step 2, place the automobile rack in an open space to simulate the ground parking lot scene, and the specific steps are the same as those of step 2 of example 1;

[0076] Step 3, according to the experimental requirements of simulating the lighter mechanical abuse failure of the battery pack, the striker 7 should be vertically upwardly aligned with the target point of the battery pack, and the angle of the striker should be set to 15 degrees in the programmable controller. The programmable controller starts the step servo motor 12, which drives the worm assembly 5 worm 5-1 to rotate. Through the cooperation of the threads 5-1-1 of the worm 5-1 and the turbine 4-2 on the worm shaft 4-1 of the turbine assembly 4, the rotating main box 2 is driven to rotate to the right in the outer box 1. When the angle between the striker 7 and the vertical direction is 15°, it is aligned with the point to be needled of the battery pack;

[0077] Step 4, press the start switch, the hydraulic lifting foot 10-1 (piston) in the four side flange oil cylinders is extended to contact the ground, and the specific steps are the same as step 4 of example 1;

[0078] Step 5, press the up key on the remote controller 11-2, the electric hydraulic jack 11 is started, the hydraulic rod 11-1 drives the striker 7 to penetrate into the battery pack through the striker seat 6. When the penetration depth of the striker 7 is 20 cm, press the pause key on the remote controller 11-2, the hydraulic rod 11-1 stops rising, and then press the down key on the remote controller 11-2, the hydraulic rod 11-1 drives the striker seat 6 and the striker 7 to disengage. Continuously observe whether there is smoke or fire phenomenon at the needling position. About 5 minutes after the striker 7 is penetrated, visible fire can be seen at the needling position of the battery pack, and the fire gradually increases. Press the down key of the lifting switch, the oil pressurized by the hydraulic pump is switched to the return oil synchronous motor through the electromagnetic reversing valve p port, enters the four side flange oil cylinders B port, drives the hydraulic lifting foot 10-1 (piston) in the four side flange oil cylinders to retract and separate from the ground. At this time, the four wheels 9 contact the ground, and the needling trigger device is timely withdrawn from the scene through the cable 16 connected with the traction ring 1-6 to protect the needling trigger device from being burned out.

[0079] The camera 13 continuously monitors the needling process and sends it to the monitoring host 14. The monitoring host 14 stores the needling process and outputs the needling position picture in real time through the display;

[0080] Through the above steps, the simulation of the lighter mechanical abuse failure of the electric vehicle in the ground parking lot scene is realized. Combined with the first part of the "China Automotive Fire Safety Evaluation Regulations" - Electric Vehicle Fire Safety Evaluation Regulations, the quantitative evaluation of the fire hazard of the lighter mechanical abuse failure of the electric vehicle in the ground parking lot scene can be realized.

[0081] Example 3, a method for using a portable needling trigger device for an electric vehicle, in which the angle of the striker is 40 degrees, step 1, select a sharp striker 7 according to the experimental requirements, and the specific installation steps are the same as step 1 of example 1;

[0082] Step 2, place the vehicle bench in an open space to simulate the ground parking lot scene, and the specific steps are the same as step 2 of example 1;

[0083] Step 3, according to the experimental requirements of simulating the battery pack heavy mechanical abuse failure, the striker 7 should be vertically upward aligned with the target point of the battery pack, and the angle of the striker should be set to 40 degrees in the programmable controller. The programmable controller starts the step servo motor 12, which drives the worm assembly 5 worm 5-1 to rotate. Through the cooperation of the worm 5-1 screw thread 5-1-1 and the turbine 4-2 on the worm shaft 4-1 of the turbine assembly 4, the rotating main box 2 is driven to rotate left in the outer box 1. When the angle between the striker 7 and the vertical direction is 40°, it is aligned with the point to be needled of the battery pack;

[0084] Step 4, press the start switch, the hydraulic lifting foot 10-1 (piston) in the four side flange oil cylinders is extended to contact the ground, and the specific steps are the same as step 4 of example 1;

[0085] Step 5, press the up key on the remote controller 11-2, the electric hydraulic jack 11 is started, the hydraulic rod 11-1 drives the striker 7 to penetrate into the battery pack through the striker seat 6. When the penetration depth of the striker 7 is 25 cm, press the pause key on the remote controller 11-2, the hydraulic rod 11-1 stops rising, and then press the down key on the remote controller 11-2, the hydraulic rod 11-1 drives the striker seat 6 and the striker 7 to disengage. Continuously observe whether there is smoke or fire phenomenon at the needle piercing position. About 1 minute after the striker 7 is pierced, visible fire can be seen at the needle piercing position of the battery pack, and the fire gradually increases. Press the down key of the lifting switch, the oil pressurized by the hydraulic pump is switched to the return oil synchronous motor through the electromagnetic reversing valve p port, enters the four side flange oil cylinders B port, drives the hydraulic lifting foot 10-1 (piston) in the four side flange oil cylinders to retract and separate from the ground. At this time, the four wheels 9 are in contact with the ground, and the needle piercing trigger device is timely withdrawn from the scene through the cable 16 connected with the traction ring 1-6 to protect the needle piercing trigger device from being burned out.

[0086] The camera 13 continuously monitors the needle piercing process and sends it to the monitoring host 14. The monitoring host 14 stores the needle piercing process and outputs the needle piercing position picture in real time through the display;

[0087] The above steps realize the simulation of the light mechanical abuse failure of the electric vehicle in the ground parking lot scene. Combined with the first part of the China Automotive Fire Safety Evaluation Regulations - Electric Vehicle Fire Safety Evaluation Regulations, the quantitative evaluation of the fire hazard of the light mechanical abuse failure of the electric vehicle in the ground parking lot scene can be realized.

[0088] Example 4, the angle of the striker is 0 degrees. A method for using a portable needle piercing trigger device for an electric vehicle, step 1, select a sharp striker 7 according to the experimental requirements, and the specific installation steps are the same as step 1 of example 1;

[0089] Step 2, arrange the vehicle bench in a full-size garage, and the specific steps are the same as step 2 of example 1.

[0090] Step 3, according to the experimental requirements of simulating the slight mechanical abuse failure of the battery pack, the striker 7 should be vertically upwardly aligned with the target point of the battery pack, and the angle of the striker should be set to 0 degrees in the programmable controller. The programmable controller starts the step servo motor 12, which drives the worm assembly 5 worm 5-1 to rotate. Through the cooperation of the worm thread 5-1-1 and the turbine 4-2 on the worm shaft 4-1 of the turbine assembly 4, the rotating main box 2 rotates in the outer box 1, and the angle between the striker 7 and the vertical direction is 0°, which is aligned with the point to be pierced by the battery pack.

[0091] Step 4, press the start switch, the hydraulic lifting feet 10-1 (piston) in the four side flange oil cylinders are extended to contact the ground, and the specific steps are the same as step 4 of example 1.

[0092] Step 5, press the up key on the remote controller 11-2, the electric hydraulic jack 11 is started, the hydraulic rod 11-1 drives the striker 7 to pierce into the battery pack through the striker seat 6. When the striker 7 pierces to a depth of 15 cm, press the pause key on the remote controller 11-2, the hydraulic rod 11-1 stops rising, and then press the down key on the remote controller 11-2, the hydraulic rod 11-1 drives the striker seat 6 and the striker 7 to disengage. Continuously observe whether there is smoke or fire phenomenon at the piercing position. About 15 minutes after the striker 7 is pierced, visible fire can be seen at the piercing position of the battery pack, and the fire gradually increases. Press the down key of the lifting switch, the oil pressurized by the hydraulic pump is switched to the return oil synchronous motor through the electromagnetic reversing valve p port, enters the four side flange oil cylinders B port, drives the hydraulic lifting feet 10-1 (piston) in the four side flange oil cylinders to retract and disengage from the ground. At this time, the four wheels 9 are in contact with the ground, and the piercing trigger device is timely withdrawn from the scene through the cable 16 connected with the traction ring 1-6 to protect the piercing trigger device from being burned out.

[0093] Through the above steps, the simulation of the slight mechanical abuse failure of the electric vehicle in the full-size garage scene is realized. Combined with the first part of the China Automotive Fire Safety Evaluation Regulations - Electric Vehicle Fire Safety Evaluation Regulations, the quantitative evaluation of the fire hazard of the slight mechanical abuse failure of the electric vehicle in the full-size garage scene can be realized.

Claims

1. A portable electric automobile needle trigger device, comprising an electric hydraulic jack, a stepping servo motor, a camera and a monitoring host and a hydraulic power assembly, the hydraulic power assembly comprising a hydraulic power unit, an oil inlet synchronous motor, an oil return synchronous motor, a hydraulic lifting foot in four side flange oil cylinders, a lifting switch and a starting switch, characterized in that: It also includes an outer box, a rotating main box, a main box cover, a turbine assembly, a worm assembly, a striker seat, a striker, a camera support and wheels; The worm assembly is arranged in the outer box, the turbine assembly is arranged in the rotating main box, the rotating main box is arranged in the outer box and connected with the outer box through the turbine assembly, the screw thread of the worm assembly is engaged with the turbine gear of the turbine assembly, the camera support and the electric hydraulic jack are respectively fixed on the rotating main box, the camera is fixed on the camera support, the striker seat is fixed on the electric hydraulic jack, and the striker is arranged in the striker seat. The hydraulic power unit, the oil inlet synchronous motor, the oil return synchronous motor and the stepping servo motor are respectively fixed on the outer box, the stepping servo motor is connected with the worm assembly, the outer box is provided with four wheels and four hydraulic lifting feet at the lower end, the hydraulic power unit is connected with the four hydraulic lifting feet through the oil inlet synchronous motor and the oil return synchronous motor, and the lifting switch and the starting switch are connected with the hydraulic power unit. The rotating main box can rotate to the left or to the right in the outer box, and the rotating angle is 0-45 degrees. The electric hydraulic jack moves the striker up and down through the remote controller. The camera communicates with the monitoring host wirelessly.

2. A portable needle trigger device for an electric vehicle as defined in claim 1, wherein The main box cover is fixed on the rotating main box, and the camera and the striker respectively extend out of the main box cover.

3. A portable needle trigger device for an electric vehicle as defined in claim 2, wherein The outer box includes main walls I, side walls, lower plates I, motor racks, hydraulic power unit racks and traction rings, one side wall is fixed on each side of the two main walls I, the lower end of the two main walls I and the two side walls is fixed with a lower plate I, the motor rack is fixed on one side wall, the hydraulic power unit rack and the traction ring are respectively fixed on the other side wall, one bearing hole is respectively and symmetrically arranged on the two main walls I, one outer sleeve groove is respectively and symmetrically arranged on the outer surface of the two side walls, and a worm hole is respectively arranged in the two outer sleeve grooves.

4. A portable needle trigger device for an electric vehicle as defined in claim 3, wherein The rotating main box includes an upper cover, main walls II and lower plates II, the upper end of the main wall II is rectangular, the lower end is semicircular, the upper end of the two main walls II is fixed with the upper cover, the lower plate II is fixed between the arc surfaces of the lower ends of the two main walls II, and worm gear shaft holes are symmetrically arranged on the two main walls II.

5. A portable needle trigger device for an electric vehicle according to claim 4, wherein The striker seat includes a circular flange, a plunger ball and a split pin, the cylindrical body at the upper end of the circular flange is respectively provided with a striker blind hole and a plunger ball hole, the striker blind hole communicating with the plunger ball hole is a vertical surface I, the cylindrical body at the lower end of the circular flange is respectively provided with a hydraulic rod blind hole and a split pin hole, the plunger ball is embedded in the plunger ball hole, the ball head of the plunger ball extends out of the vertical surface I, and the split pin is inserted into the split pin hole.

6. A portable needle trigger device for an electric vehicle as defined in claim 5, wherein The striker is a sharp-headed striker or a straight-headed striker, and the side surface of the cylindrical body at the lower end of the striker is a vertical surface II, and a circular groove is arranged on the vertical surface II.

7. A portable needle trigger device for an electric vehicle according to claim 6, wherein The rotating main box is arranged in the outer box, and the specific structure of the turbine assembly connected with the outer box is as follows: the turbine assembly comprises a worm shaft, a turbine, a turbine fastening flange, a pressure bearing, a bearing, a fastening nut and a fixing flange; two fixing flanges are respectively arranged in the inner side of the worm shaft hole of the two main walls II of the rotating main box, and the centers of the fixing flanges are respectively coaxial with the worm shaft hole; one bearing is respectively arranged in the bearing hole of the two main walls I of the outer box; one side of the turbine is fixed on one side of the shaft block of the worm shaft, and the turbine fastening flange is fixed on the other side of the turbine; one end of the worm shaft is sequentially screwed with one fixing flange, the worm shaft hole of one main wall II, one pressure bearing, one bearing and one fastening nut; the other end of the worm shaft is sequentially screwed with the other fixing flange, the worm shaft hole of the other main wall II, the other pressure bearing, the other bearing and the other fastening nut.

8. A portable needle trigger device for an electric vehicle according to claim 7, wherein The specific structure of the worm assembly arranged in the outer box is as follows: the worm assembly comprises a worm, a tapered roller bearing, a fastening nut, a coupling and an outer sleeve; two outer sleeves are respectively fixed in the outer sleeve grooves on the two side walls of the outer box, and one tapered roller bearing is arranged in each of the two outer sleeves; the worm is provided with threads, one end of the worm is sequentially screwed with the worm hole of one side wall of the outer box, one tapered roller bearing, one fastening nut and a coupling, and the other end of the worm is sequentially screwed with the worm hole of the other side wall of the outer box, the other tapered roller bearing and the other fastening nut.

9. A portable needle stick trigger device for an electric vehicle as defined in claim 8, wherein, The specific connection structure of the striker seat, the electric hydraulic jack and the striker is as follows: the hydraulic rod of the electric hydraulic jack is arranged in the hydraulic rod blind hole of the striker seat, is fixed on the striker seat through a split pin, the striker vertical surface II corresponds to the striker blind hole vertical surface I, the striker is inserted into the striker blind hole of the striker seat, the plunger ball is embedded in the plunger ball hole, and the striker is positioned in the striker seat by cooperation of the ball head of the plunger ball and the circular concave groove on the striker vertical surface II.

10. A method of using the portable needle stick activation device for an electric vehicle of claim 9, wherein, The steps are as follows: Step 1: according to the experimental requirements, select the striker with a pointed head or a straight head, and position the striker in the striker seat; Step 2: place the experimental electric vehicle on the vehicle rack, and push the needle puncture trigger device to the bottom of the electric vehicle; Step 3: according to the simulated damage degree of the battery pack, adjust the angle of the striker, and make the striker aim at the point of the battery pack to be punctured; Step 4: press the lowering key of the lifting switch, the hydraulic lifting foot is extended to contact the ground, and the needle puncture trigger device is stably positioned at the bottom of the electric vehicle; Step 5: press the rising key on the remote controller, the electric hydraulic jack is started, the hydraulic rod drives the striker to pierce into the battery pack, when the piercing length meets the experimental requirements, press the pause key on the remote controller, the hydraulic rod stops rising, then press the lowering key on the remote controller, the hydraulic rod drives the striker seat and the striker to disengage, continuously observe whether there is smoke or fire phenomenon at the puncture site, when the fire at the bottom of the battery pack cannot be controlled, press the rising key of the lifting switch, the hydraulic lifting foot is retracted and separated from the ground, the four wheels contact the ground, the needle puncture trigger device is timely withdrawn from the scene through the cable connected with the traction ring; The camera continuously monitors the puncture process, stores the puncture process through the monitoring host, and outputs the picture of the puncture site in real time through the display. The above steps achieve the purpose of triggering thermal runaway of an electric vehicle through mechanical abuse and monitoring thermal runaway process phenomena.

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