Bottom acupuncture test equipment with fire extinguishing function for battery pack

Abstract

The invention relates to the field of battery pack detection, and discloses a battery pack bottom needling test device with a fire extinguishing function, the battery pack bottom needling test device comprises a bottom shell mechanism and a sealing assembly arranged above the bottom shell mechanism, the bottom shell mechanism comprises a bottom plate, a fixed frame is fixedly arranged above the bottom plate, and a needling assembly is arranged on one side of the fixed frame; the device comprises a base plate, a fixing frame, a needle assembly and a connecting groove, four connecting assemblies are arranged above the base plate, a supporting plate is arranged in the fixing frame, two locking assemblies are arranged on the side, close to the needle assembly, of the inner wall of the fixing frame, and two connecting rod assemblies are arranged in each connecting groove. The heavy connecting shell rapidly falls down under the action of gravity and is tightly attached to the bottom shell mechanism, a temporary closed combustion cavity is formed, the combustion cavity is prevented from being diffused to an external test site, and the risks that fire spread occurs and people are directly burnt or impacted are fundamentally avoided.

Description

Technical Field

[0001] This invention relates to the field of battery pack testing technology, specifically to a bottom needle penetration test device for battery packs with fire extinguishing function. Background Technology

[0002] In patent application CN214310814U, the device includes a main frame, support rods, several limiting blocks, a support plate, a drive cylinder, a telescopic rod, a test needle, a fixing plate, and a control box. The main frame has parallel support rods on its upper end, and limiting blocks are fitted onto the main frame. A support plate is located between the two side walls of the main frame. The upper surface of the support plate has a drive cylinder and a control box. The drive cylinder has a telescopic rod and a test needle arranged sequentially, and the test needle is electrically connected to the control box. A fixing plate is located on the main frame corresponding to the position of the test needle. The battery pack needle penetration test bench described in this application has a reasonable design, simple structure, low failure rate, and good safety and operational stability. The device has a high degree of automation, simplifies operation steps, speeds up testing, thereby improving work efficiency and economic benefits. It facilitates standardized and systematic production on the production line and has good performance.

[0003] Among the aforementioned patents, some existing devices have certain limitations. During the needle penetration process, the battery pack may rapidly induce thermal runaway due to internal short circuits, leading to fire, explosion, and the generation of high-temperature splashes and large amounts of toxic fumes. Traditional equipment usually lacks effective active fire extinguishing and hazardous substance control measures, mainly relying on external fire-fighting facilities or manual intervention. This not only increases the experimental risk but may also lead to the spread of fire, environmental pollution, and threats to personnel safety. In addition, the battery pack may shift or bounce during the needle penetration and thermal runaway process, affecting the needle penetration accuracy and the reliability of the test results, and may also cause secondary damage to the equipment and the surrounding environment. Summary of the Invention

[0004] The purpose of this invention is to provide a bottom needle penetration test device for battery packs with fire extinguishing function, so as to solve the problems mentioned in the background art.

[0005] To solve the above technical problems, the technical solution of the present invention is: a bottom needle penetration test device for a battery pack with fire extinguishing function, comprising a bottom shell mechanism and a sealing assembly disposed above the bottom shell mechanism. The bottom shell mechanism includes a bottom plate, on which two connecting grooves are formed. Two sliding grooves are formed at the bottom inside the connecting grooves. A fixing frame is fixedly disposed above the bottom plate. A needle assembly is disposed on one side of the fixing frame. Four sets of connecting assemblies are disposed above the bottom plate. The four sets of connecting assemblies are respectively disposed above the four corners of the bottom plate. A support plate is disposed inside the fixing frame. Two sets of locking assemblies are disposed on the inner wall of the fixing frame near the needle assembly. Two sets of connecting rod assemblies are disposed in each connecting groove. The linkage assembly includes sliding blocks that are slidably disposed in the slide grooves. An installation block is fixedly connected to the upper end of the sliding block. A rotating rod is rotatably connected to the outer side of the installation block. A connecting short plate is rotatably connected to the other end of the rotating rod.

[0006] Preferably, a limiting slide rod is fixedly connected in two slides below one of the connecting grooves, and a bidirectional threaded rod is rotatably connected in two slides below the other connecting groove. A motor is installed in the base plate, and the output end of the motor is connected to one end of the bidirectional threaded rod.

[0007] Preferably, the upper ends of the connecting short plates on both sets of connecting rod assemblies are fixedly connected to a support plate, and pressure plates are fixedly connected to the upper sides of the end of the support plate away from the needle assembly.

[0008] Preferably, the locking assembly includes two connecting blocks fixedly connected to the inner wall of the fixed frame near the needle assembly. The connecting blocks have sliding grooves, and a sliding vertical plate is slidably connected inside the sliding grooves. A movable plate is fixedly connected to the upper end of the sliding vertical plate. A threaded rod is rotatably connected inside the connecting blocks. A rotating disk is fixedly connected to one end of the threaded rod. The rotating disk is rotatably connected to one side of the fixed frame. A threaded hole corresponding to the threaded rod is provided on the sliding vertical plate.

[0009] Preferably, four limiting vertical plates are fixedly connected above the base plate, and the four limiting vertical plates are respectively located on both sides of the support plate. A connecting plate is fixedly connected to the inner wall of the fixed frame on the side near the needle assembly.

[0010] Preferably, the connecting assembly includes a connecting vertical plate fixedly connected to the upper part of the base plate, a normally closed electromagnet is provided inside the upper part of the connecting vertical plate, and a limit block is fixedly connected to one side of the connecting vertical plate.

[0011] Preferably, the sealing assembly includes a connecting shell disposed above the bottom shell mechanism. Connecting frames are fixedly connected to both ends of the connecting shell, and the connecting frames correspond to the connecting vertical plates. A slot is provided on one side of the connecting frame, and the slot corresponds to a normally closed electromagnet. A pressure relief pipe is fixedly connected to the side of the connecting shell near the needle assembly, and a pressure relief valve is provided inside the pressure relief pipe. An air extraction pipe is fixedly connected to the side of the connecting shell away from the needle assembly, and the air extraction pipe is connected to a negative pressure device through a flexible hose. An installation assembly is disposed above the connecting shell.

[0012] Preferably, a sealing gasket is fixedly connected to the lower end of the connecting shell, and weight blocks are fixedly connected to the upper sides of both ends of the connecting shell. An installation component is provided on one side of the connecting shell, and the position of the installation component corresponds to the needle assembly.

[0013] Preferably, the connecting shell has a mounting hole, and an explosion-proof glass is fixedly installed in the mounting hole.

[0014] Preferably, the mounting assembly includes a mounting frame fixedly connected to the upper end of the connecting shell, two connecting crossbars fixedly connected to the side of the mounting frame away from the pressure relief pipe, a fixed crossbar fixedly connected inside the mounting frame, multiple through holes opened below the mounting frame and the fixed crossbars, pipes opened inside the mounting frame and the fixed crossbars, the pipes and the fixed crossbars communicating with the through holes, and through holes corresponding to the through holes opened on the connecting shell.

[0015] Compared with the prior art, the technical solution of the present invention has the following advantages: (1) A sealing component is provided above the bottom shell mechanism. After the battery pack is punctured and catches fire, the temperature sensor inside the connecting shell monitors in real time. The signal triggers the normally closed electromagnet to unlock, causing the heavy connecting shell to fall rapidly under the action of gravity and fit tightly with the bottom shell mechanism to form a temporary sealed combustion chamber. This effectively seals the flame, high-temperature splashes, and initially generated toxic fumes within the limited space formed by the fixed frame and the connecting shell, preventing them from spreading to the external test site. This fundamentally avoids the risk of fire spread and direct burns or impacts to personnel. The pressure plate and the multi-directional locking component work together to ensure that the battery pack does not shift or bounce during puncture and combustion. One end of the battery pack is continuously supported by the two pressure plates on the support plate. By pressing down and restricting its longitudinal movement, the battery pack is tightly pressed against the limiting vertical plates on both sides to prevent horizontal sliding. The locking component at the other end of the battery pack drives the threaded rod by rotating the rotating disk, which ultimately causes the moving plate at the top of the sliding vertical plate to press down on the battery pack, thus pressing the battery pack tightly from above. This multi-point and multi-directional constraint from below, sides, top, and end faces forms a rigid fixing system, which firmly locks the battery pack in the predetermined posture. This ensures that the piercing needle can penetrate the designated position at a precise angle and depth. In the event of severe thermal runaway, rapid internal gas production, or even partial explosion of the battery pack, it can effectively prevent the battery pack from shifting, rolling, or flying out due to impact, ensuring that the entire runaway process is confined within the designed safe space. (2) This application adopts a three-stage fire extinguishing and cooling strategy of negative pressure extraction, inert gas injection, and pure water spraying. After sealing, the system first starts the negative pressure equipment and actively extracts the air in the combustion chamber through the extraction pipe. This can quickly reduce the internal oxygen concentration and suppress the fire from the perspective of combustion support conditions. Then, inert gas is injected into the cavity at high speed through the pipes and through holes in the installation components to further create an asphyxiating environment and achieve rapid fire extinguishing. After the fire is extinguished, pure water is injected through the same set of pipes. The water mist is sprayed onto the surface of the battery pack, which can remove a large amount of heat and cause the temperature of the battery pack body and internal cells to drop sharply. This effectively blocks the chain chemical reaction and secondary thermal runaway that may be caused by continuous high temperature, greatly reducing the risk of explosion and the generation of subsequent toxic gases. This method of handling, compared to simple inert gas extinguishing, can more thoroughly solve the problem of continuous heat release after battery thermal runaway. Finally, the connection design between the pressure relief pipe and the container, as well as the observation window of the explosion-proof glass, constitute additional safety and monitoring measures. During the closed fire extinguishing process, if the internal pressure is too high, the pressure relief valve will automatically open, guiding the high-pressure gas to a dedicated container, avoiding possible physical explosions in the confined space. At the same time, operators can remotely observe the internal combustion and fire extinguishing status through the explosion-proof glass without having to approach the danger zone, achieving "remote" monitoring that is safe for human eyes. This greatly protects the personal safety of operators and reduces the pollution of the laboratory environment by toxic and harmful substances, demonstrating a high degree of safety and environmental protection. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the bottom shell mechanism of the present invention; Figure 3 This is a schematic diagram of the fixed frame structure of the present invention; Figure 4 This is a schematic diagram of the connection component structure of the present invention; Figure 5 This is a schematic diagram of the base plate structure of the present invention; Figure 6 This is a schematic diagram of the connecting rod assembly and the limiting slide bar structure of the present invention; Figure 7 This is a schematic diagram of the connecting rod assembly and bidirectional threaded rod structure of the present invention; Figure 8 This is a schematic diagram of the locking component structure of the present invention; Figure 9 This is a schematic diagram of the sealing assembly structure of the present invention; Figure 10 This is a schematic diagram of the connecting shell structure of the present invention; Figure 11 This is a schematic diagram of the installation component structure of the present invention; Figure 12 This is a schematic diagram of the internal structure of the mounting frame of the present invention.

[0017] In the diagram: 1. Bottom shell mechanism; 11. Base plate; 111. Connecting groove; 112. Sliding groove; 12. Fixing frame; 121. Connecting plate; 122. Limiting vertical plate; 13. Needle assembly; 14. Connecting assembly; 141. Connecting vertical plate; 142. Normally closed electromagnet; 143. Limiting block; 15. Support plate; 151. Pressure plate; 16. Locking assembly; 161. Connecting block; 162. Sliding groove; 163. Sliding vertical plate; 164. Moving plate; 165. Rotating disk; 166. Threaded rod; 17. Connecting rod assembly; 71. Sliding block; 172. Mounting block; 173. Rotating rod; 174. Connecting short plate; 18. Limiting slide rod; 19. Bidirectional threaded rod; 2. Sealing assembly; 21. Connecting shell; 211. Sealing gasket; 212. Weight block; 213. Groove; 214. Mounting hole; 215. Explosion-proof glass; 22. Connecting frame; 221. Slot; 23. Mounting assembly; 231. Mounting frame; 232. Connecting crossbar; 233. Fixing crossbar; 234. Through hole; 235. Pipe; 24. Pressure relief pipe; 25. Air extraction pipe. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0019] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "comprising" or "including," and similar terms used in this disclosure, mean that an element or object preceding the term encompasses the elements or objects listed following the term and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but may also include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0020] like Figures 1 to 12 As shown, the present invention provides a bottom needle penetration test device for a battery pack with fire extinguishing function, including a bottom shell mechanism 1 and a sealing assembly 2 disposed above the bottom shell mechanism 1. The bottom shell mechanism 1 includes a bottom plate 11, on which two connecting grooves 111 are opened, and two sliding grooves 112 are opened at the bottom inside the connecting grooves 111. A fixing frame 12 is fixedly disposed above the bottom plate 11, and a needle assembly 13 is disposed on one side of the fixing frame 12. Four sets of connecting assemblies 14 are disposed above the bottom plate 11, and the four sets of connecting assemblies 14 are respectively disposed above the four corners of the bottom plate 11. A support plate 15 is disposed inside the fixing frame 12, and two sets of locking assemblies 16 are disposed on the inner wall of the fixing frame 12 near the needle assembly 13. Two sets of connecting rod assemblies 17 are respectively disposed in each connecting groove 111. The linkage assembly 17 includes sliding blocks 171 that are slidably disposed in the slide groove 112. An installation block 172 is fixedly connected to the upper end of the sliding block 171. A rotating rod 173 is rotatably connected to the outer side of the installation block 172. A connecting short plate 174 is rotatably connected to the other end of the rotating rod 173.

[0021] A limiting slide rod 18 is fixedly connected in two slide grooves 112 below one of the connecting grooves 111. The limiting slide rod 18 is slidably connected to the sliding block 171 of a set of connecting rod assemblies 17. A bidirectional threaded rod 19 is rotatably connected in two slide grooves 112 below the other connecting groove 111. A motor is installed in the base plate 11. The output end of the motor is connected to one end of the bidirectional threaded rod 19. The bidirectional threaded rod 19 is threadedly connected to the sliding block 171 of another set of connecting rod assemblies 17.

[0022] The upper ends of the connecting short plates 174 on the two sets of connecting rod assemblies 17 are fixedly connected to the support plate 15, and the upper sides of the support plate 15 away from the needle assembly 13 are respectively fixedly connected to the pressure plate 151.

[0023] The locking assembly 16 includes two connecting blocks 161 fixedly connected to the inner wall of the fixed frame 12 near the needle assembly 13. A sliding groove 162 is provided on the connecting block 161. A sliding vertical plate 163 is slidably connected inside the sliding groove 162. A moving plate 164 is fixedly connected to the upper end of the sliding vertical plate 163. A threaded rod 166 is rotatably connected inside the connecting block 161. A rotating disk 165 is fixedly connected to one end of the threaded rod 166. The rotating disk 165 is rotatably connected to one side of the fixed frame 12. A threaded hole corresponding to the threaded rod 166 is provided on the sliding vertical plate 163.

[0024] Four limiting vertical plates 122 are fixedly connected above the base plate 11. The four limiting vertical plates 122 are located on both sides of the support plate 15. A connecting plate 121 is fixedly connected to the inner wall of the fixed frame 12 near the needle assembly 13. The connecting plate 121 has through holes corresponding to the needles on the needle assembly 13, and a sealing rubber ring is provided in the through holes of the connecting plate 121. The sealing rubber ring is tightly fitted with the needles on the needle assembly 13.

[0025] The connecting assembly 14 includes a connecting vertical plate 141 fixedly connected to the upper end of the base plate 11. A normally closed electromagnet 142 is provided inside the upper part of the connecting vertical plate 141, and a limit block 143 is fixedly connected to one side of the connecting vertical plate 141.

[0026] The sealing assembly 2 includes a connecting shell 21 disposed above the bottom shell mechanism 1. A temperature sensor is fixedly disposed inside the upper part of the connecting shell 21. Connecting frames 22 are fixedly connected to both sides of the connecting shell 21. The connecting frames 22 correspond to the connecting vertical plate 141. A slot 221 is opened on one side of the connecting frame 22, which corresponds to the normally closed electromagnet 142. A pressure relief pipe 24 is fixedly connected to the side of the connecting shell 21 near the needle assembly 13. The pressure relief pipe 24 is connected to the waste gas storage container through a connecting pipe to prevent the leakage of toxic gas. A pressure relief valve is provided inside the pressure relief pipe 24. An air extraction pipe 25 is fixedly connected to the side of the connecting shell 21 away from the needle assembly 13. The air extraction pipe 25 is connected to the negative pressure device through a hose. An installation assembly 23 is disposed above the connecting shell 21.

[0027] A sealing gasket 211 is fixedly connected to the lower end of the connecting shell 21, and weight blocks 212 are fixedly connected to the upper sides of both ends of the connecting shell 21. An installation component 23 is provided on one side of the connecting shell 21, and the position of the installation component 23 corresponds to that of the needle assembly 13.

[0028] The connecting shell 21 has a mounting hole 214, and an explosion-proof glass 215 is fixedly installed in the mounting hole 214.

[0029] The mounting assembly 23 includes a mounting frame 231 fixedly connected to the upper end of the connecting shell 21. Two connecting crossbars 232 are fixedly connected to the side of the mounting frame 231 away from the pressure relief pipe 24. A fixed crossbar 233 is fixedly connected inside the mounting frame 231. Multiple through holes 234 are opened below the mounting frame 231 and the fixed crossbar 233. Pipes 235 are opened inside the mounting frame 231 and the fixed crossbar 233. The pipes 235 are connected to the fixed crossbar 233 and the through holes 234. The connecting shell 21 has through holes corresponding to the through holes 234. The two connecting crossbars 232 are respectively connected to the inert gas storage tank through connecting pipes and water injection equipment.

[0030] The working principle of this invention is as follows: During testing, the battery pack is placed on the support plate 15, and one end of the battery pack is pushed under the pressure plate 151, so that the two pressure plates 151 press down on one end of the battery pack. The motor in the base plate 11 drives the bidirectional threaded rod 19 to rotate, and the bidirectional threaded rod 19 drives the two sliding blocks 171 to slide in the slide groove 112, and the distance between the two sliding blocks 171 becomes shorter. The two sliding blocks 171 of the other set of connecting rod assembly 17 also slide in the slide groove 112, and at the same time slide outside the limiting slide rod 18. At this time, the support plate 15 falls downward, driving the battery pack into the fixed frame 12. After the battery pack is completely inside the fixed frame 12, the limiting vertical plate 122 is located on both sides of the battery pack, and the connecting block 161 is located at one end of the battery pack, fixing the outside of the battery pack. The rotating disk 165 drives the threaded rod 166 to rotate, and the threaded rod 166 drives the sliding vertical plate 163 to move in the sliding groove 162. The sliding vertical plate 163 drives the moving plate 164 to move above the battery pack, pressing down on the battery pack. The piercing needle assembly 13 drives the piercing needle to pierce the battery pack. When the battery pack catches fire, the temperature sensor below the connecting shell 21 detects a temperature rise and controls the normally closed electromagnet 142, causing its locking tongue to retract and no longer insert into the slot 221. The connecting frame 22 is no longer locked. Under the weight of the connecting shell 21 and the counterweight 212, the connecting shell 21 falls downwards and covers the base plate 11, placing the fixing frame 12 inside the connecting shell 21. The connecting shell 21 contacts the base plate 11. If the internal pressure of the connecting shell 21 and the fixing frame 12 is too high, the pressure relief valve in the pressure relief pipe 24 opens, releasing the internal gas into the container through the connecting pipe. The negative pressure equipment connected to the extraction pipe 25 operates, extracting the air from the connecting shell 21 and the fixing frame 12, reducing the oxygen level in the connecting shell 21 and the fixing frame 12. Subsequently, the inert gas storage tank releases gas through the connecting pipe into the container. Inert gas is injected into another connecting crossbar 232. The inert gas enters the connecting shell 21 and the fixing frame 12 through the pipe 235 and the through hole 234 to quickly extinguish the fire in the battery pack. Then, the gas injection is stopped. Then, pure water is injected into the connecting crossbar 232 through the connecting pipe and the water injection device connected to the connecting crossbar 232. The pure water is sprayed into the connecting shell 21 and the fixing frame 12 through the pipe 235 and the through hole 234, and sprayed onto the top of the battery pack to cool it down and prevent the internal materials of the battery pack from reacting due to high temperature, thus preventing the chemical reaction and the production of a large amount of toxic gas. After a certain amount of pure water is injected, the water injection is stopped. During this process, the condition of the battery pack can be observed through the explosion-proof glass 215. The connecting shell 21 and the fixing frame 12 completely enclose the battery pack to prevent the battery pack from burning and exploding and causing injury to the staff.

[0031] The above embodiments are merely exemplary embodiments of the present invention and are not intended to limit the present invention. The scope of protection of the present invention is defined by the claims. Those skilled in the art can make various modifications or equivalent substitutions to the present invention within its spirit and scope of protection, and such modifications or equivalent substitutions should also be considered to fall within the scope of protection of the present invention.

Claims

1. A bottom needle penetration test device for a battery pack with fire extinguishing function, comprising a bottom shell mechanism (1) and a sealing assembly (2) disposed above the bottom shell mechanism (1), characterized in that: The bottom shell mechanism (1) includes a bottom plate (11), on which two connecting grooves (111) are opened, and two sliding grooves (112) are opened at the bottom inside the connecting grooves (111). A fixing frame (12) is fixedly installed on the top of the bottom plate (11), and a needle assembly (13) is installed on one side of the fixing frame (12). Four sets of connecting assemblies (14) are installed on the top of the bottom plate (11), and the four sets of connecting assemblies (14) are respectively installed on the top of the four corners of the bottom plate (11). A support plate (15) is installed inside the fixing frame (12), and two sets of locking assemblies (16) are installed on the side of the inner wall of the fixing frame (12) near the needle assembly (13). Two sets of connecting rod assemblies (17) are respectively installed in each connecting groove (111). The linkage assembly (17) includes sliding blocks (171) that are slidably disposed in the slide groove (112). An installation block (172) is fixedly connected to the upper end of the sliding block (171). A rotating rod (173) is rotatably connected to the outside of the installation block (172). A connecting short plate (174) is rotatably connected to the other end of the rotating rod (173).

2. The bottom needle penetration test device for a battery pack with fire extinguishing function according to claim 1, characterized in that: A limiting slide rod (18) is fixedly connected in two slide grooves (112) below one of the connecting grooves (111), and a bidirectional threaded rod (19) is rotatably connected in two slide grooves (112) below the other connecting groove (111). A motor is provided in the base plate (11), and the output end of the motor is connected to one end of the bidirectional threaded rod (19).

3. The bottom needle penetration test device for a battery pack with fire extinguishing function according to claim 2, characterized in that: The upper ends of the connecting short plates (174) on the two sets of connecting rod assemblies (17) are fixedly connected to a support plate (15), and pressure plates (151) are fixedly connected to the upper sides of the end of the support plate (15) away from the needle assembly (13).

4. The bottom needle penetration test device for a battery pack with fire extinguishing function according to claim 1, characterized in that: The locking component (16) includes two connecting blocks (161) fixedly connected to the inner wall of the fixed frame (12) near the needle assembly (13). The connecting blocks (161) are provided with sliding grooves (162). A sliding vertical plate (163) is slidably connected inside the sliding grooves (162). A moving plate (164) is fixedly connected to the upper end of the sliding vertical plate (163). A threaded rod (166) is rotatably connected inside the connecting blocks (161). A rotating disk (165) is fixedly connected to one end of the threaded rod (166). The rotating disk (165) is rotatably connected to one side of the fixed frame (12). A threaded hole corresponding to the threaded rod (166) is provided on the sliding vertical plate (163).

5. The bottom needle penetration test device for a battery pack with fire extinguishing function according to claim 4, characterized in that: Four limiting vertical plates (122) are fixedly connected above the base plate (11). The four limiting vertical plates (122) are located on both sides of the support plate (15). A connecting plate (121) is fixedly connected to the inner wall of the fixed frame (12) on the side close to the needle assembly (13).

6. The bottom needle penetration test device for a battery pack with fire extinguishing function according to claim 5, characterized in that: The connecting assembly (14) includes a connecting vertical plate (141) fixedly connected to the upper end of the base plate (11), a normally closed electromagnet (142) is provided inside the upper part of the connecting vertical plate (141), and a limit block (143) is fixedly connected to one side of the connecting vertical plate (141).

7. The bottom needle penetration test device for a battery pack with fire extinguishing function according to claim 6, characterized in that: The sealing assembly (2) includes a connecting shell (21) disposed above the bottom shell mechanism (1). Connecting frames (22) are fixedly connected to both sides of the connecting shell (21). The connecting frames (22) correspond to the connecting vertical plate (141). A slot (221) is provided on one side of the connecting frame (22). The slot (221) corresponds to the normally closed electromagnet (142). A pressure relief pipe (24) is fixedly connected to the side of the connecting shell (21) near the needle assembly (13). A pressure relief valve is provided inside the pressure relief pipe (24). An air extraction pipe (25) is fixedly connected to the side of the connecting shell (21) away from the needle assembly (13). The air extraction pipe (25) is connected to a negative pressure device through a hose. An installation assembly (23) is provided above the connecting shell (21).

8. The bottom needle penetration test device for a battery pack with fire extinguishing function according to claim 7, characterized in that: A sealing gasket (211) is fixedly connected to the lower end of the connecting shell (21), and weight blocks (212) are fixedly connected to the upper sides of both ends of the connecting shell (21). An installation component (23) is provided on one side of the connecting shell (21), and the position of the installation component (23) corresponds to that of the needle assembly (13).

9. The bottom needle penetration test device for a battery pack with fire extinguishing function according to claim 8, characterized in that: The connecting shell (21) has an installation hole (214), and an explosion-proof glass (215) is fixedly installed in the installation hole (214).

10. The bottom needle penetration test device for a battery pack with fire extinguishing function according to claim 9, characterized in that: The mounting assembly (23) includes a mounting frame (231) fixedly connected to the upper end of the connecting shell (21). Two connecting crossbars (232) are fixedly connected to the side of the mounting frame (231) away from the pressure relief pipe (24). A fixed crossbar (233) is fixedly connected inside the mounting frame (231). Multiple through holes (234) are opened below the mounting frame (231) and the fixed crossbar (233). A pipe (235) is opened inside the mounting frame (231) and the fixed crossbar (233). The pipe (235) is connected to the fixed crossbar (233) and the through hole (234). A through hole corresponding to the through hole (234) is opened on the connecting shell (21).

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