A new energy vehicle combustion test platform

Abstract

The present application relates to new energy automobile power battery safety detection equipment technical field, especially to a kind of new energy automobile combustion test platform, technical scheme: a kind of new energy automobile combustion test platform, including experimental platform and the sealing box cover of hinged installation on experimental platform upper end by L type hinged member, still including multiple cooling fire extinguishing structure and external puncture structure installed in experimental platform and sealing box cover, multiple cooling fire extinguishing structure includes the lifting platform being arranged in sinking cooling groove and the two groups of shower head being installed in the inner wall of sealing box cover left and right two ends through, external puncture structure includes the roller frame being installed in the center of experimental platform upper end, the present application is cooperated by lifting sinking immersion cooling structure and box body shower cooling structure, realize the global immersion type rapid cooling of fire battery package, high efficiency block thermal runaway, synchronous suppression cavity open fire and high-temperature flue gas, completely eliminate the afterheat afterburning hidden danger, greatly improve fire extinguishing efficiency.

Description

Technical Field

[0001] This invention belongs to the technical field of safety testing equipment for power batteries of new energy vehicles, and specifically relates to a combustion test platform for new energy vehicles. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the safety performance testing of vehicle power battery packs has become a core part of the industry's R&D and compliance testing. Among them, the needle penetration-triggered thermal runaway test and the closed environment combustion test are key test items for determining the fire safety performance of power batteries.

[0003] In existing technologies, most new energy vehicle battery pack combustion test platforms only employ a single fixed spray extinguishing method to cool and extinguish the burning battery pack after completing the battery pack fire test. This extinguishing method is relatively simple. However, in actual testing, relying solely on external spray water can only suppress and cool the open flames on the outer surface of the battery pack. Cooling water cannot penetrate into the gaps in the battery pack casing, module gaps, or the internal locations of the battery cells. This makes it difficult to quickly remove the large amount of residual heat accumulated inside the battery pack, leading to difficulty in quickly containing the spread of thermal runaway within the battery cells. Consequently, even after the open flame is temporarily extinguished, the fire can easily reignite. The phenomenon of reignition due to residual internal heat results in poor fire extinguishing effect and long extinguishing time, seriously affecting the test progress and safety. At the same time, traditional test equipment can only spray water to cool the battery pack body, and it is difficult to simultaneously cool and suppress the high-temperature flue gas rising in the test chamber and the sporadic open flames remaining in the chamber. The high-temperature flue gas not only easily causes the internal components of the test equipment to age and be damaged by heat, but also easily causes the residual heat of the flue gas to ignite the debris in the chamber, causing secondary fire accidents. To address these issues, this invention proposes a new energy vehicle combustion test platform to solve the above-mentioned defects of the existing technology. Summary of the Invention

[0004] In order to overcome the problems of existing new energy vehicle battery pack combustion test platforms that use a single spray fire extinguishing method, such as the inability of cooling water to penetrate into the battery pack, the inability to quickly remove the high-temperature residual heat inside, which leads to easy reignition, poor fire extinguishing effect and long time consumption, and the inability to simultaneously cool down and suppress high-temperature smoke and residual open flames in the sealed cavity, which can easily cause secondary fire accidents.

[0005] The technical solution of the present invention is as follows: a new energy vehicle combustion test platform, comprising an experimental platform and a sealed enclosure hinged to the upper part of the experimental platform via an L-shaped hinge, and further comprising a multi-stage cooling and fire extinguishing structure and an external puncture structure installed within the experimental platform and the sealed enclosure. A sunken cooling trough is provided at the center of the upper end of the experimental platform, and side storage slots are provided at the left and right ends of the sealed enclosure. The multi-stage cooling and fire extinguishing structure includes a lifting platform installed in the sunken cooling trough and two sets of spray heads, an infrared temperature sensor, and a gas detection sensor that are installed through the inner walls of the left and right ends of the sealed enclosure. A lifting hydraulic cylinder is installed at the center of the lower end of the lifting platform, and four sets of telescopic rods are installed at the four corners of the lower end of the lifting platform. The external puncture structure includes a roller frame installed at the center of the upper end of the experimental platform, a unwinding roller rotatably installed within the roller frame, a right-angle reduction motor installed on the right side of the roller frame, a drop platform correspondingly installed above the experimental platform, and a puncture cone fixed to the center of the lower end of the drop platform. A wire unwinding bearing is installed through the sealed enclosure at the location corresponding to the roller frame.

[0006] Preferably, four sets of telescopic rods and lifting hydraulic cylinders are installed at five points at the bottom of the sinking cooling tank. The outer wall of the lifting platform is in contact with the inner wall of the sinking cooling tank. A water storage tank is installed in the side storage slot. The water storage tank and the spray head are connected to each other through a connecting pipe. A water supply pump is installed in the water storage tank. The lower end of the water storage tank is in contact with the upper left and right sides of the experimental platform.

[0007] Preferably, the outer wall of the lifting platform is provided with water inlet grooves around its perimeter, and the upper and lower ends of the lifting platform are provided with several sets of filter grooves that avoid the telescopic rods and lifting hydraulic cylinders. The sinking cooling tank is filled with coolant.

[0008] Preferably, four sets of limiting posts are fixedly connected to the four corner edges of the upper end of the lifting platform, and a top frame is fixedly connected to the upper end of the four sets of limiting posts. Four sets of sliding grooves are opened through the four corner edges of the upper and lower ends of the lower platform. A hanging ear is fixedly connected to the center of the upper end of the lower platform. A unwinding wire rope is wound on the unwinding roller. The lower end of the unwinding wire rope passes through the unwinding bearing and is installed on the hanging ear. The output end of the right-angle reduction motor passes through the roller frame and is connected to the unwinding roller.

[0009] Preferably, the four corners of the lowering platform are fitted onto the outer wall of the limiting post, and the inner wall of the slide groove is fitted into the outer wall of the limiting post.

[0010] Preferably, the lower platform has two sets of through holes symmetrically distributed on the left and right sides. The upper end of the sealed box cover is equipped with a smoke exhaust pipe corresponding to the through holes. The lower end of the smoke exhaust pipe is equipped with a smoke exhaust fan. Two sets of side door panels are hinged and symmetrically distributed on the left and right sides in the two sets of side storage slots. Handles are installed on the side door panels.

[0011] Preferably, the front and rear ends of the sealed box cover are provided with a first groove, an observation window is installed in the first groove, and a handle is fixed to the front edge of the sealed box cover.

[0012] As a preferred embodiment, a magnetic groove is provided at the upper edge of the experimental platform, an iron sheet is installed at the lower end of the sealed box cover, the sealed box cover is magnetically installed in the magnetic groove, and water inlet pipes and water outlet pipes connected to the sinking cooling tank are installed at the left and right ends of the experimental platform.

[0013] Preferably, the infrared temperature sensor and the gas detection sensor are located below the spray head. The two sets of infrared temperature sensors and gas detection sensors are symmetrically distributed front and back, with the two sets of gas detection sensors located between the two sets of infrared temperature sensors. The inner wall of the sealed enclosure corresponds to the sinking cooling tank and the lifting platform.

[0014] The beneficial effects of this invention are: 1. After the battery pack combustion test, the lifting hydraulic cylinder, in conjunction with four sets of telescopic rods, synchronously drives the lifting platform, along with the burning battery pack, to smoothly sink into the coolant in the sinking cooling tank. This achieves full-area immersion cooling of the battery pack. At this time, the coolant can quickly penetrate into the gaps in the battery pack shell, the gaps between modules, and the inside of the cells, absorbing the large amount of heat generated by combustion in all directions. This instantly suppresses the spread of thermal runaway in the cells and blocks the combustion reaction from the root. At the same time, the water pump in the side-mounted water tank starts quickly and delivers the coolant to the spray nozzles on the inner wall of the sealed enclosure through the connecting pipe. This sprays and cools the remaining open flames and rising high-temperature smoke inside the enclosure, suppressing the reignition of the surface open flames and reducing the temperature of the smoke. This prevents the high-temperature smoke from igniting the surrounding components again. The dual cooling effect of the two methods significantly improves the fire extinguishing speed compared to traditional single spraying and completely eliminates the problem of secondary reignition caused by the residual heat inside the power battery after combustion. 2. The puncture mechanism, consisting of a roller frame, unwinding roller, right-angle geared motor, and puncture cone, is set on the outside of the sealed box and above, isolated from the sealed combustion test chamber. When the battery pack catches fire inside the sealed box, the high-temperature flame and corrosive fumes generated are blocked by the sealed box and cannot come into contact with the external puncture components. This completely avoids the motor components being burned by high temperature and corroded by fumes, effectively prevents the puncture mechanism from malfunctioning, greatly extends the service life of the puncture mechanism, and reduces equipment maintenance costs and test failure rate. Attached Figure Description

[0015] Figure 1 The diagram shown is a three-dimensional structural schematic of the new energy vehicle combustion test platform of the present invention. Figure 2 The diagram shown is a three-dimensional structural breakdown of the new energy vehicle combustion test platform of the present invention. Figure 3The diagram shown is a first three-dimensional structural breakdown of the multiple cooling and fire extinguishing structures and the external puncture structure of the new energy vehicle combustion test platform of the present invention. Figure 4 The diagram shown is a second three-dimensional structural breakdown of the multiple cooling and fire extinguishing structures and the external puncture structure of the new energy vehicle combustion test platform of the present invention. Figure 5 The diagram shown is a third-dimensional structural breakdown of the external puncture structure of the new energy vehicle combustion test platform of the present invention. Figure 6 The diagram shown is a fourth three-dimensional structural breakdown of the external puncture structure of the new energy vehicle combustion test platform of the present invention. Figure 7 The diagram shown is a workflow logic diagram of the new energy vehicle combustion test platform of the present invention.

[0016] Explanation of reference numerals in the attached drawings: 1-Experimental platform, 2-Sealed enclosure, 3-Lifting platform, 4-Lowering platform, 5-Side door panel, 6-Observation window, 7-Telescopic rod, 8-Limiting column, 9-Top frame, 10-Slide groove, 11-Hanging ear, 12-Through hole, 13-Water inlet tank, 14-Filter tank, 15-Magnetic suction tank, 16-Sinking cooling tank, 17-Lifting hydraulic cylinder, 18-Piercing cone, 19-L-shaped hinge, 20-Water storage tank, 21-Infrared temperature sensor, 22-Gas detection sensor, 23-Spray head, 24-First tank body, 25-Exhaust pipe, 26-Exhaust fan, 27-Payout bearing, 28-Side storage groove, 29-Connecting pipe, 30-Payout wire rope, 31-Roller frame, 32-Payout roller, 33-Right angle reduction motor. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Please see Figures 1-7This invention provides an embodiment of a new energy vehicle combustion test platform, comprising an experimental platform 1 and a sealed enclosure 2 hinged to the upper end of the experimental platform 1 via an L-shaped hinge 19. It also includes a multi-stage cooling and fire extinguishing structure and an external puncture structure installed within the experimental platform 1 and the sealed enclosure 2. A sunken cooling groove 16 is provided at the center of the upper end of the experimental platform 1, and side storage grooves 28 are provided at both ends of the sealed enclosure 2. The multi-stage cooling and fire extinguishing structure includes a lifting platform 3 disposed within the sunken cooling groove 16 and two sets of spray nozzles installed through the inner walls of both ends of the sealed enclosure 2. The device includes a head 23, an infrared temperature sensor 21, and a gas detection sensor 22. A lifting hydraulic cylinder 17 is installed at the lower center of the lifting platform 3. Four sets of telescopic rods 7 are installed at the four corners of the lower end of the lifting platform 3. The external piercing structure includes a roller frame 31 installed at the upper center of the experimental platform 1, a unwinding roller 32 rotatably installed in the roller frame 31, a right-angle reduction motor 33 installed on the right side of the roller frame 31, a drop platform 4 correspondingly set above the experimental platform 1, and a piercing cone 18 fixed to the lower center of the drop platform 4. A wire feeding bearing 27 is installed through the sealing box cover 2 at the roller frame 31.

[0019] Please see Figures 3-4 In this embodiment, four sets of telescopic rods 7 and lifting hydraulic cylinders 17 are installed at five points at the bottom of the sinking cooling tank 16. The outer wall of the lifting platform 3 is attached to the inner wall of the sinking cooling tank 16. A water storage tank 20 is installed in the side storage slot 28. The water storage tank 20 and the spray head 23 are connected to each other through a connecting pipe 29. A water supply pump is installed in the water storage tank 20. The lower end of the water storage tank 20 is attached to the upper left and right sides of the experimental platform 1. The five-point lifting drive layout ensures balanced force distribution, and the lifting platform 3 operates smoothly without tilting, and can withstand heavy battery packs without eccentric swaying. The water storage tank 20 is integrated on the side, making full use of the spare space on the side of the equipment, resulting in a compact overall structure and reduced footprint. The built-in water supply pump is directly connected to the spray head 23 through a pipeline. The system features a fast water supply response and stable spray water supply, enabling instant cooling during testing without the need for an external temporary water source. Water inlet troughs 13 are perforated around the outer wall of the lifting platform 3. Several sets of filter tanks 14, avoiding the telescopic rod 7 and the lifting hydraulic cylinder 17, are perforated at both the upper and lower ends of the lifting platform 3. The sinking cooling tank 16 contains coolant, and the water inlet troughs 13 accelerate the rapid influx of coolant into the area above the lifting platform 3, quickly submerging the battery pack after it sinks, thus improving the cooling and fire extinguishing rate. The filter tanks 14 not only meet assembly avoidance requirements but also achieve water permeability and filtration of combustion residue, preventing the accumulation of combustion residue that could obstruct the lifting structure. The filter tanks 14 achieve upper and lower coolant convection circulation, ensuring uniform coolant temperature and consistent cooling effect, preventing localized high-temperature reignition.

[0020] Please see Figures 4-6In this embodiment, four sets of limiting posts 8 are fixedly connected to the four corner edges of the upper end of the lifting platform 3, and a top frame 9 is fixedly connected to the upper end of the four sets of limiting posts 8. Four sets of sliding grooves 10 are opened through the four corner edges of the upper and lower ends of the lower platform 4. A hanging ear 11 is fixedly connected to the center of the upper end of the lower platform 4. A unwinding wire rope 30 is wound on the unwinding roller 32. The lower end of the unwinding wire rope 30 passes through the unwinding bearing 27 and is installed on the hanging ear 11. The output end of the right-angle reduction motor 33 passes through the roller frame 31 and is connected to the unwinding roller 32. The four corner limiting posts 8 form a vertical precision guiding structure, restricting the movement trajectory of the lower platform 4, ensuring vertical lifting without deviation or jamming; the motor and wire rope winding transmission structure has a simple layout, stable power transmission, and can smoothly realize the overall lifting action of the needle-piercing mechanism and the pressure mechanism; the right-angle reduction motor 33 occupies little lateral space, adapts to the narrow installation space at the top, and has smooth start-stop braking and controllable lifting speed. The four corners of the lower platform 4 are fitted onto the outer wall of the limiting posts 8, and the inner wall of the sliding groove 10 fits against the outer wall of the limiting posts 8, with a tight sliding fit that greatly reduces the running gap. The lower platform 4 has high verticality during lifting, accurate positioning during needle-piercing operations, and small piercing position error; the sliding guide structure has strong resistance to lateral impact, and is not prone to positional deviation under needle-piercing impact and flame impact, improving the accuracy of test data. The upper and lower ends of the lower platform 4 are provided with two sets of symmetrically distributed through holes 12. The upper end of the sealed box cover 2 is equipped with a smoke exhaust pipe 25 corresponding to the through holes 12, and the lower inner wall of the smoke exhaust pipe 25 is equipped with a smoke exhaust fan 26. The two sets of side-mounted The material tank 28 is hinged with two sets of side door panels 5 symmetrically distributed on the left and right sides. The side door panels 5 are equipped with handles. The through holes 12 are precisely aligned with the exhaust pipes 25, so that the high-temperature toxic fumes generated by combustion can be drawn out in a directional and concentrated manner, avoiding the accumulation of fumes in the sealed chamber. The exhaust fan 26 forces the exhaust air to accelerate the circulation of fumes, reduce the concentration of fumes and the internal air pressure in the chamber, and improve the safety of the test. The openable side door panels 5 facilitate quick and easy inspection and maintenance of internal sensors and pipelines, making operation convenient and maintenance highly convenient.

[0021] Please see Figures 3-5 In this embodiment, the front and rear ends of the sealed box cover 2 are provided with a first groove 24, and an observation window 6 is installed in the first groove 24. A handle is fixed to the front edge of the sealed box cover 2. The transparent observation window 6 enables full-process visual observation. The test personnel can directly observe the entire process of battery pack ignition, thermal runaway and combustion spread without opening the box cover. The front handle facilitates quick opening, closing and moving of the sealed box cover 2, and the disassembly and assembly of test samples is highly efficient.

[0022] Please see Figures 3-6In this embodiment, a magnetic groove 15 is provided at the upper edge of the experimental platform 1, and an iron sheet is installed at the lower end of the sealed box cover 2. The sealed box cover 2 is magnetically installed in the magnetic groove 15. Water inlet pipes and water outlet pipes connected to the sinking cooling tank 16 are installed at the left and right ends of the experimental platform 1. The magnetic sealing docking structure closes quickly and effortlessly, fits tightly, effectively prevents the internal high-temperature flue gas from overflowing, and has a good sealing and flame-retardant effect. The magnetic structure is easy to disassemble and assemble, and positioning is quick, without the need for a cumbersome locking structure, which improves the efficiency of test assembly. Independent inlet and outlet water pipes realize external circulation heat exchange of coolant, and can be connected to an external refrigeration unit to achieve constant temperature control. The coolant is recycled, which is more energy-efficient. Environmentally friendly, continuously maintaining the low-temperature fire extinguishing environment of the cooling tank, the infrared temperature sensor 21 and the gas detection sensor 22 are located below the spray head 23. The two sets of infrared temperature sensors 21 and gas detection sensors 22 are symmetrically distributed front and back. The two sets of gas detection sensors 22 are located between the two sets of infrared temperature sensors 21. The inner wall of the sealed box cover 2 corresponds to the sunken cooling tank 16 and the lifting platform 3. The temperature and gas sensors are symmetrically arranged front and back, which can collect the temperature field and smoke concentration of the left and right and front and back areas of the battery pack in the whole area, with no blind spots in the monitoring range. The sensors are arranged below the spray, which does not block the spray cooling path and can collect the test parameters of the core combustion area at close range in real time.

[0023] In this invention, the telescopic rod 7 can be of the WSP waterproof telescopic guide rod series, QWL fully waterproof synchronous telescopic rod, or FY underwater protective telescopic column series; the lifting hydraulic cylinder 17 can be of the HSG-W fully waterproof hydraulic cylinder, MOB-S underwater submersible hydraulic cylinder, or YHG underwater special hydraulic cylinder series; the infrared temperature sensor 21 can be of the TX-W waterproof infrared temperature sensor or OS136AW immersion smoke-proof infrared temperature sensor; the gas detection sensor 22 can be of the ZE08 electrochemical waterproof gas sensor or SGP30 waterproof smoke sensor series; the spray head 23 can be of the B1 corrosion-resistant atomizing spray head or SPJT stainless steel waterproof cooling spray head series; the exhaust fan 26 can be of the HTF-W waterproof high-temperature resistant exhaust axial fan or YWF moisture-proof and explosion-proof exhaust fan series; the right-angle geared motor 33 can be of the SGF-W waterproof right-angle geared motor or 90YT-GW outdoor moisture-proof right-angle geared motor series; the specific embodiments of this invention are combined with Figure 7 As described below: When in use, the operator first holds the handle at the front end of the sealing box cover 2 and opens the sealing box cover 2 by rotating the L-shaped hinge 19. Then, the power battery pack to be tested is placed on the lifting platform 3 in the center of the experimental platform 1. At the same time, the position of the battery pack is adjusted so that it is centered and aligned directly below the puncture cone 18 to ensure accurate puncture position. After placement, the operator lowers the sealing box cover 2 so that the iron plate at the lower end of the sealing box cover 2 is precisely aligned with the magnetic groove 15 at the upper end of the experimental platform 1. The magnetic attraction force completes the tight sealing and closing, completely isolating the test space from the external environment and forming a sealed combustion chamber to prevent the leakage of high-temperature smoke, open flame and corrosive electrolyte during combustion, thus ensuring test safety. Next, the operator starts the right-angle geared motor 33 through the external CNC computer. The output of the motor drives the unwinding roller 32 in the roller frame 31 to rotate, so as to release the coiled unwinding wire rope 30. The wire rope is smoothly lowered through the unwinding bearing 27 on the sealed box cover 2. The traction lowering platform 4 slides vertically downward steadily along the four sets of limit posts 8 until the puncture cone 18 accurately punctures the battery pack, triggering an internal short circuit and causing thermal runaway. After the puncture is completed, the operator immediately reverses the operation of the right-angle geared motor 33 to drive the unwinding roller 32 to retract the wire rope. The traction lowering platform 4 and the puncture cone 18 are simultaneously reset and moved away from the combustion test area to avoid damage to the punctured parts by high-temperature flue gas during subsequent combustion. After the puncture triggers thermal runaway, the power battery pack gradually ignites and burns, forming a closed combustion environment inside the sealed enclosure 2. During the test, two sets of infrared temperature sensors 21 collect temperature data of the battery pack surface and combustion area in real time, and two sets of gas detection sensors 22 collect concentration data of harmful flammable gases such as hydrogen, carbon monoxide, and hydrogen fluoride in real time. All test data collected by the sensors are synchronously transmitted to an external CNC computer, which completes the real-time display, summarization, storage, and preliminary analysis of the data, making it easy for operators to monitor the combustion process in real time. At the same time, the operators can visually observe the combustion status of the battery pack through the observation windows 6 at both ends of the sealed enclosure 2, including the speed of open flame spread, the bulging and deformation of the battery pack, and the amount of smoke generated. Combined with the sensor data on the CNC computer, the progress and safety of the combustion test are comprehensively judged. Meanwhile, the exhaust fan 26 orderly discharges the combustion smoke through the exhaust pipe 25 to ensure the safety of the test environment. When the operator determines that the combustion test is complete by combining the visual status of the observation window 6 with the sensor data on the external CNC computer, the lifting hydraulic cylinder 17 and the four sets of telescopic rods 7 are manually activated. The two work in sync to quickly retract, so as to drive the lifting platform 3, which carries the battery pack in the combustion state, to sink smoothly. As the lifting platform 3 sinks, the water inlet 13 around the lifting platform 3 accelerates the influx of coolant, so that the battery pack is quickly and completely covered by the coolant in the sinking cooling tank 16, achieving immersion cooling. The coolant quickly penetrates into the gaps in the battery pack shell, the gaps between modules and the inside of the cells, absorbing the large amount of heat generated by combustion in all directions, inhibiting the spread of thermal runaway of the cells, and blocking the combustion reaction from the root. At the same time, the operator starts the water supply pump in the water storage tank 20 through the CNC computer. The water supply pump quickly delivers the coolant in the water storage tank 20 to the spray head 23 on the inner wall of the sealed box cover 2 through the connecting pipe 29. The spray head 23 sprays the remaining sporadic open flames and rising high-temperature smoke in the box to cool down the entire area. This not only suppresses the re-ignition of open flames on the surface, but also reduces the temperature of the smoke, preventing the high-temperature smoke from igniting the surrounding parts again. This achieves the dual cooling and fire extinguishing operation of the submerged water and the top spray. After the fire extinguishing operation was completed, the operator confirmed through the observation window 6 that there was no open flame inside the box, the smoke concentration had decreased significantly, and the external CNC computer showed that the temperature data had dropped to a safe range. Then, the operator manually operated the lifting hydraulic cylinder 17 and the telescopic rod 7 to extend synchronously, driving the lifting platform 3 and the cooled battery pack to rise smoothly and return to the position level with the test platform 1. Then, the water supply pump and the exhaust fan 26 were turned off. After the battery pack had completely cooled down and the smoke inside the box had been fully discharged, the operator held the handle of the sealed box cover 2 and lifted the sealed box cover 2 again to check the state of the battery pack after burning. Finally, the battery pack after the test was removed from the lifting platform 3 for subsequent insulation testing, shell integrity testing, electrolyte leakage testing, and other failure analysis. At the same time, the burning residue on the surface of the lifting platform 3 was cleaned, and the coolant in the water storage tank 20 and the sinking cooling tank 16 was replenished to prepare for the next test.

[0024] Through the above steps, the combined use of the lifting and lowering immersion cooling structure and the box spray cooling structure achieves rapid cooling and extinguishing of the entire immersion cooling system in the burning battery pack, effectively preventing thermal runaway, simultaneously suppressing open flames and high-temperature smoke inside the chamber, completely eliminating the risk of reignition due to residual heat, and significantly improving fire extinguishing efficiency. This solves the problem of existing battery pack combustion test platforms relying solely on spray extinguishing, where coolant is difficult to penetrate into the battery, residual heat can easily cause reignition, fire extinguishing efficiency is low, and smoke and fire cannot be effectively reduced or controlled, which can easily lead to secondary fires.

[0025] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A new energy vehicle combustion test platform, comprising an experimental platform (1) and a sealed enclosure (2) hinged to the upper end of the experimental platform (1) via an L-shaped hinge (19), characterized in that: It also includes a multi-stage cooling and fire extinguishing structure and an external puncture structure installed in the experimental platform (1) and the sealed enclosure (2). The upper center of the experimental platform (1) is provided with a sunken cooling tank (16), and the left and right ends of the sealed enclosure (2) are provided with side storage slots (28). The multi-stage cooling and fire extinguishing structure includes a lifting platform (3) installed in the sunken cooling tank (16) and two sets of spray heads (23) installed through the inner walls of the left and right ends of the sealed enclosure (2), an infrared temperature sensor (21) and a gas detection sensor (22). The lower center of the lifting platform (3) is provided with a sunken cooling tank (16) and an external puncture structure. The lifting hydraulic cylinder (17) is installed, and four sets of telescopic rods (7) are installed at the four corners of the lower end of the lifting platform (3). The external piercing structure includes a roller frame (31) installed at the center of the upper end of the experimental platform (1), a unwinding roller (32) rotatably installed in the roller frame (31), a right-angle reduction motor (33) installed on the right side of the roller frame (31), a drop platform (4) correspondingly set above the experimental platform (1), and a piercing cone (18) fixed to the center of the lower end of the drop platform (4). A wire feeding bearing (27) is installed through the sealing box cover (2) at the roller frame (31).

2. The new energy vehicle combustion test platform according to claim 1, characterized in that: Four sets of telescopic rods (7) and lifting hydraulic cylinders (17) are installed in a five-point configuration at the bottom of the sinking cooling tank (16). The outer wall of the lifting platform (3) is in contact with the inner wall of the sinking cooling tank (16). A water storage tank (20) is installed in the side storage slot (28). The water storage tank (20) and the spray head (23) are connected to each other through a connecting pipe (29). A water supply pump is installed in the water storage tank (20). The lower end of the water storage tank (20) is in contact with the upper left and right sides of the experimental platform (1).

3. The new energy vehicle combustion test platform according to claim 2, characterized in that: The outer wall of the lifting platform (3) is provided with a water inlet groove (13) and several sets of filter grooves (14) are provided at the upper and lower ends of the lifting platform (3) to avoid the telescopic rod (7) and the lifting hydraulic cylinder (17). The sinking cooling groove (16) is filled with coolant.

4. The new energy vehicle combustion test platform according to claim 1, characterized in that: Four sets of limiting posts (8) are fixed at the four corner edges of the upper end of the lifting platform (3). The top frame (9) is fixed at the upper end of the four sets of limiting posts (8). Four sets of sliding grooves (10) are opened through the four corner edges of the upper and lower ends of the lower platform (4). A hanging ear (11) is fixed at the center of the upper end of the lower platform (4). A unwinding wire rope (30) is wound on the unwinding roller (32). The lower end of the unwinding wire rope (30) passes through the unwinding bearing (27) and is installed on the hanging ear (11). The output end of the right angle reduction motor (33) passes through the roller frame (31) and is connected to the unwinding roller (32).

5. The new energy vehicle combustion test platform according to claim 4, characterized in that: The four corners of the lowering platform (4) are fitted onto the outer wall of the limiting post (8), and the inner wall of the slide (10) is in contact with the outer wall of the limiting post (8).

6. The new energy vehicle combustion test platform according to claim 1, characterized in that: The lower platform (4) has two sets of through holes (12) symmetrically distributed on the left and right sides. The upper end of the sealed box cover (2) is equipped with a smoke exhaust pipe (25) corresponding to the through hole (12). The inner wall of the lower end of the smoke exhaust pipe (25) is equipped with a smoke exhaust fan (26). Two sets of side door panels (5) symmetrically distributed on the left and right sides are hinged in the two sets of side storage slots (28). Handles are installed on the side door panels (5).

7. The new energy vehicle combustion test platform according to claim 6, characterized in that: The front and rear ends of the sealed box cover (2) are provided with a first groove (24), and an observation window (6) is installed in the first groove (24). A handle is fixed to the front edge of the sealed box cover (2).

8. The new energy vehicle combustion test platform according to claim 1, characterized in that: A magnetic suction groove (15) is provided at the upper edge of the experimental platform (1), and an iron sheet is installed at the lower end of the sealed box cover (2). The sealed box cover (2) is installed in the magnetic suction groove (15) in an interlocking magnetic manner. Water inlet pipes and water outlet pipes that are connected to the sinking cooling tank (16) are installed at the left and right ends of the experimental platform (1).

9. The new energy vehicle combustion test platform according to claim 1, characterized in that: The infrared temperature sensor (21) and the gas detection sensor (22) are located below the spray head (23). The two sets of infrared temperature sensors (21) and gas detection sensors (22) are symmetrically distributed front and back. The two sets of gas detection sensors (22) are located between the two sets of infrared temperature sensors (21). The inner wall of the sealed box cover (2) corresponds to the sinking cooling tank (16) and the lifting platform (3).

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