Extrusion test device for battery pack extrusion test bench

Abstract

The present invention discloses an extrusion test device for a battery pack extrusion test bench, which includes a test chamber and a battery pack, and further includes a support assembly, an extrusion assembly, a cooling assembly and a synchronization assembly; the test chamber is a closed box body, the bottom of the test chamber is provided with the support assembly, the top of the support assembly forms a test bench for testing the battery pack, the top of the support assembly is provided with the extrusion assembly, the cooling assembly is arranged inside the extrusion assembly, and the synchronization assembly is also arranged inside the support assembly; the support assembly buffers the pressure of the extrusion assembly and the battery pack on the bottom wall of the test chamber through sliding, the synchronization assembly is used to control the battery pack to be arranged corresponding to the center of the extrusion assembly, the extrusion assembly is used to test the compressive capacity of the battery pack, and after the battery pack catches fire, the cooling assembly quickly extinguishes the fire on the outer wall of the battery pack under the action of the phase change material.

Description

Technical Field

[0001] The present invention relates to the technical field of battery extrusion testing, and particularly relates to an extrusion testing device for a battery pack extrusion test bench. Background Art

[0002] In order to simulate the situation after the battery pack is extruded and deformed when the vehicle collides. When extruding the battery pack, the battery pack needs to be placed on the extrusion test bench, and then the battery pack is extruded by driving the extrusion block. When the battery pack is deformed during extrusion, there is a probability of sudden combustion and explosion.

[0003] However, the existing extrusion test benches are generally connected to the air, so that the air can support the entire process of complete combustion of the battery, and then the dust generated after the battery pack burns will fill the entire extrusion test bench, making it difficult to clean up later; at the same time, the full combustion of the battery pack will cause irreversible damage to the extrusion test bench, and the service life of the device is short.

[0004] Therefore, it is proposed to provide an extrusion testing device for a battery pack extrusion test bench that reduces the damage to the extrusion test bench. Summary of the Invention

[0005] The purpose of the present invention is to provide an extrusion testing device for a battery pack extrusion test bench to solve the technical problem that the existing battery pack extrusion test bench is damaged when it catches fire and is in full contact with the air.

[0006] To achieve the above object, the present invention provides the following technical solutions: An extrusion testing device for a battery pack extrusion test bench, including a test chamber and a battery pack, further including a support assembly, an extrusion assembly, a cooling assembly, and a synchronization assembly; the test chamber is a closed box body, the bottom of the test chamber is provided with the support assembly, the top of the support assembly forms a test bench for testing the battery pack, the top of the support assembly is provided with the extrusion assembly, the cooling assembly is arranged inside the extrusion assembly, and the synchronization assembly is also arranged inside the support assembly; the support assembly buffers the pressure of the extrusion assembly and the battery pack on the bottom wall of the test chamber by sliding, the synchronization assembly is used to control the battery pack to be arranged corresponding to the center of the extrusion assembly, the extrusion assembly is used to test the compressive capacity of the battery pack, and after the battery pack catches fire, the cooling assembly sprays quickly on the outer wall of the battery pack under the action of the phase change material.

[0007] Further, the support assembly includes a bottom support plate and a buffer plate, the bottom support plate is provided as an explosion-proof layer, the buffer plate is detachably connected to the bottom of the bottom support plate, the synchronization assembly is arranged inside the bottom support plate, limiting components are arranged on both sides of the bottom support plate, a sliding assembly is arranged at the bottom of the buffer plate, and the sliding assembly drives the bottom support plate and the buffer plate to slide inside the test chamber.

[0008] Further, the extrusion assembly includes an extrusion block, a spiral tube, an output rod, and a hydraulic pump; the hydraulic pump is installed on the top of the test chamber, the hydraulic pump is drivingly connected to the output rod, and a thread is provided on the outer side of the bottom end of the output rod; the bottom of the spiral tube is connected to the output rod by a threaded engagement connection, the extrusion block is installed at the bottom end of the output rod, and the bottom of the extrusion block is used to extrude the battery pack.

[0009] Further, a closing door is installed on the front side of the test chamber, an observation window and a handle are installed on the closing door, a top plate is also installed in the test chamber, the spiral tube penetrates through the top plate and extends between the top plate and the bottom support plate, when the closing door is closed, the closing door and the rear wall of the test chamber, the top plate and the bottom support plate form a closed space, and the closed space is used to reduce the contact between the outside air and the battery pack and prevent the full combustion of the battery pack.

[0010] Further, the cooling component includes an extrusion shell, a connecting pipe, a solenoid valve, air holes, fixing pieces, an intermediate ring, and a phase change cavity; the extrusion block is arranged as a cylindrical cavity, the spiral tube is arranged as a hollow outer tube, the extrusion block and the spiral tube are communicated, an extrusion shell is installed on the inner bottom wall of the extrusion block, the extrusion shell shares the same bottom wall with the extrusion block and the diameter of the extrusion shell is smaller than the diameter of the extrusion block, and the diameter of the extrusion shell is larger than any side length of the battery pack, a connecting pipe is communicated with the middle of the top end of the extrusion shell, the connecting pipe is arranged as a hollow inner tube, a solenoid valve is arranged in the middle of the connecting pipe, the connecting pipe is fixedly connected to the spiral tube through the fixing piece, air holes evenly distributed are formed on the side wall of the connecting pipe between the solenoid valve and the fixing piece, an intermediate ring is further arranged between the inside of the extrusion block and the outside of the extrusion shell, the intermediate ring is fixedly installed on the outer side of the connecting pipe, and a phase change cavity is installed at one end of the top of the intermediate ring away from the extrusion block; spray holes evenly distributed are formed on the bottom wall of the extrusion block outside the extrusion shell.

[0011] Further, a liquid is arranged in the extrusion shell, and the liquid is vaporized after absorbing heat when the battery pack catches fire; the solenoid valve is arranged as a one-way valve, and gas can only flow unidirectionally from the inside of the extrusion shell to the outside of the extrusion shell; the phase change cavity is arranged as a phase change material, the phase change material is in a solid state at normal temperature and in a liquid state after absorbing heat; a water inlet hole is also formed in the extrusion shell.

[0012] Further, the limiting component includes a limiting key, a limiting groove, a water-permeable cotton, a water filtering hole, a water pipe and a water tank; the limiting grooves are symmetrically arranged on the left and right side walls of the test box, the two ends of the bottom support plate are fixedly connected with the limiting keys, the limiting keys are slidably arranged inside the corresponding limiting grooves, the water-permeable cotton is fixedly installed in the middle of the limiting keys, a plurality of the water filtering holes are formed in the water-permeable cotton, the bottoms of the plurality of water filtering holes are commonly connected with the water pipe, and the water tank is arranged on the side wall of the test box corresponding to the bottom of the water pipe; the water pipe is an elastic hose.

[0013] Further, the synchronization component includes a synchronization block, a driving groove, a driving shaft, a driving gear, a synchronization rod and a communication groove; two symmetrically arranged communication grooves are formed at the top end of the bottom support plate, a driving groove is formed in the middle of the bottom support plate, the two side communication grooves communicate with the driving groove, a driving shaft is rotatably connected in the middle of the driving groove, a driving gear is fixedly connected to the outer side of the driving shaft, the synchronization rods are symmetrically installed at both ends of the driving gear, one end of the synchronization rod close to the driving groove is connected with the driving gear in a gear meshing manner, the other end of the synchronization rod away from the driving groove is slidably installed on the side wall of the driving groove, synchronization blocks are fixedly connected to the mutually separated ends of the two synchronization rods, and the top ends of the synchronization blocks penetrate through the communication grooves and are in movable abutment with the battery pack.

[0014] Further, the support component includes a sliding rod, a support sleeve and a support spring; a plurality of the sliding rods are installed at the bottom of the buffer plate, the number of the sliding rods is at least one, the sliding rods are slidably arranged inside the support sleeves, and the support springs are arranged between the support sleeves and the sliding rods, and the support springs drive the sliding rods to move away from the support sleeves.

[0015] Further, the support component further includes an elastic key and a fixed key, the elastic key is further installed on the bottom wall of the test box, the fixed key is installed at the bottom of the buffer plate, the elastic key and the fixed key are arranged correspondingly, and when the elastic key and the fixed key are in abutment, the electromagnetic valve is opened.

[0016] The beneficial effects of the present invention are as follows:

[0017] 1. By arranging the closed door, the rear wall, the top plate and the bottom support plate of the test box to form a closed space, the present invention prevents the full combustion of the battery pack, reduces the damage to the extrusion test bench, and prolongs its service life.

[0018] 2. By arranging replaceable synchronization blocks and a bottom support plate to replace the overall replacement of the test bench, the present invention reduces the damage to the device caused by the combustion of the battery pack, has a lower replacement cost, and a longer service life of the device.

[0019] 3. The present invention can replace different extrusion heads through threaded connection to be applicable to battery packs of different sizes and models. Meanwhile, it is convenient to replace the extrusion block and the spiral tube, further reducing the damage to the overall test bench. Then, through the structural design of the cooling component, when the battery pack catches fire, the liquid in the extrusion shell absorbs heat and vaporizes, and is discharged through the solenoid valve and the air holes. The air flow releases heat and turns into liquid after passing through the phase change cavity and the intermediate ring, and then the liquid is sprayed onto the outer wall of the battery pack, achieving rapid fire extinguishing of the battery pack, preventing damage to the extrusion component, and further reducing the damage to the overall test bench.

[0020] 4. Through the linkage structural design of the support component and the cooling component, the cooling component only starts to work when the battery pack is placed on the top of the bottom support plate and catches fire. Through the linkage structural design of the synchronization component and the cooling component, while fixing the battery pack, the heat conduction path when the battery pack catches fire is controlled. The linkage structural design of the limit component and the cooling component realizes the enclosure of the interior of the test chamber when the device cools down. The linkage structure is simple and the device has strong integrity. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is the front view structural schematic diagram of the extrusion test device for the battery pack extrusion test bench of the present invention;

[0022] Figure 2 is the sectional view structural schematic diagram of the extrusion test device for the battery pack extrusion test bench of the present invention;

[0023] Figure 3 is the internal structure schematic diagram of the present invention with the closing door removed;

[0024] Figure 4 is Figure 3 the structural schematic diagram after removing the battery pack and the extrusion component;

[0025] Figure 5 is the vertical sectional view structural schematic diagram of the extrusion component of the present invention;

[0026] Figure 6 is the horizontal sectional view structural schematic diagram of the extrusion component of the present invention;

[0027] Figure 7 is the top view structural schematic diagram of the extrusion component of the present invention;

[0028] Figure 8 is the horizontal sectional view structural schematic diagram of the bottom support plate of the present invention;

[0029] Figure 9 is the top view structural schematic diagram of the bottom support plate of the present invention.

[0030] Explanation of the reference numerals in the drawings:

[0031] 11. Test chamber; 12. Observation window; 13. Handle; 14. Battery pack; 15. Top plate; 21. Extrusion block; 22. Spiral tube; 23. Output rod; 24. Hydraulic pump; 31. Synchronization block; 32. Drive groove; 33. Drive shaft; 34. Drive gear; 35. Synchronization rod; 37. Communication groove; 41. Bottom support plate; 42. Buffer plate; 43. Sliding rod; 44. Support sleeve; 45. Support spring; 46. Limit key; 47. Limit groove; 51. Elastic key; 52. Fixed key; 61. Permeable cotton; 62. Water filtering hole; 63. Water pipe; 64. Water tank; 71. Extrusion shell; 72. Connecting pipe; 73. Solenoid valve; 74. Air hole; 75. Fixed piece; 76. Intermediate ring; 77. Phase change chamber; 78. Spraying hole; 81. Water inlet hole. Specific implementation mode

[0032] Please refer to Figures 1-9 ;

[0033] Embodiment 1:

[0034] An extrusion test device for a battery pack extrusion test bench, comprising a test chamber 11 and a battery pack 14, and further comprising a support assembly, an extrusion assembly, a cooling assembly and a synchronization assembly; the test chamber 11 is a closed box body, the bottom of the test chamber 11 is provided with the support assembly, the top of the support assembly forms a test bench for testing the battery pack 14, the top of the support assembly is provided with the extrusion assembly, the cooling assembly is arranged inside the extrusion assembly, and the synchronization assembly is also arranged inside the support assembly; the support assembly buffers the pressure of the extrusion assembly and the battery pack 14 on the bottom wall of the test chamber 11 through sliding, the synchronization assembly is used to control the battery pack 14 to be arranged corresponding to the center of the extrusion assembly, the extrusion assembly is used to test the compressive capacity of the battery pack 14, and after the battery pack 14 catches fire, the cooling assembly sprays quickly on the outer wall of the battery pack 14 under the action of the phase change material.

[0035] A closing door is installed on the front side of the test chamber 11, an observation window 12 and a handle 13 are installed on the closing door, a top plate 15 is also installed inside the test chamber 11, the spiral tube 22 penetrates through the top plate 15 and extends between the top plate 15 and the bottom support plate 41, when the closing door is closed, the closing door and the rear wall of the test chamber 11, the top plate 15 and the bottom support plate 41 form a closed space, and the closed space is used to reduce the contact between the outside air and the battery pack 14 and prevent the full combustion of the battery pack 14.

[0036] In this embodiment, a closed space is formed by setting the closing door and the rear wall of the test chamber 11, the top plate 15 and the bottom support plate 41, which prevents the full combustion of the battery pack 14, reduces the damage to the extrusion test bench, and extends its service life.

[0037] Embodiment 2;

[0038] In Embodiment 1, the structural design of the support assembly is lacking.

[0039] The support assembly includes a bottom support plate 41 and a buffer plate 42. The bottom support plate 41 is set as an explosion-proof layer. The buffer plate 42 is detachably connected to the bottom of the bottom support plate 41. A synchronization assembly is arranged inside the bottom support plate 41. Limiting assemblies are arranged on both sides of the bottom support plate 41. A sliding assembly is arranged at the bottom of the buffer plate 42. The sliding assembly drives the bottom support plate 41 and the buffer plate 42 to slide inside the test chamber 11, so as to prevent the deformation of the bottom support plate 41 and extend its service life.

[0040] In this embodiment, after the battery pack 14 catches fire, the device can be continued to be used by replacing the bottom support plate 41. Compared with replacing the entire test bench in the prior art, the cost of replacing the bottom support plate 41 in this device is lower, and the damage to the test bench is smaller.

[0041] As a further solution of this embodiment, the synchronization assembly includes a synchronization block 31, a driving groove 32, a driving shaft 33, a driving gear 34, a synchronization rod 35 and a communication groove 37. Two symmetrically arranged communication grooves 37 are opened at the top end of the bottom support plate 41. A driving groove 32 is opened in the middle of the bottom support plate 41. The two communication grooves 37 on both sides are communicated with the driving groove 32. A driving shaft 33 is rotatably connected to the middle of the driving groove 32. A driving gear 34 is fixedly connected to the outside of the driving shaft 33. Synchronization rods 35 are symmetrically installed at both ends of the driving gear 34. One end of the synchronization rod 35 close to the driving groove 32 is connected to the driving gear 34 by gear meshing. The other end of the synchronization rod 35 away from the driving groove 32 is slidably installed on the side wall of the driving groove 32. Synchronization blocks 31 are fixedly connected to the mutually separated ends of the two synchronization rods 35. The top end of the synchronization block 31 penetrates through the communication groove 37 and is in movable abutment with the battery pack 14.

[0042] In this embodiment, the synchronization assembly realizes aligning the center of the battery pack 14 with the center of the extrusion block 21 through the cooperation of gears and racks, prevents the battery pack 14 from tilting, so that the heat of the battery pack 14 can be accurately conducted to the inside of the extrusion shell 71 first, and the liquid in the extrusion shell 71 is vaporized. At the same time, the positioning of the battery pack 14 is realized, the positioning is accurate, and the test effect is good.

[0043] Preferably, the synchronization groove can be arranged at the bottom of the bottom support plate 41 and the top of the buffer plate 42; wherein the synchronization block 31 is detachably connected to the synchronization rod 35. After the battery pack 14 catches fire, the test bench can be replaced by replacing the synchronization block 31 and the bottom support plate 41, with lower cost and longer service life.

[0044] Preferably, under normal circumstances, the extrusion force needs to reach at least 100 KN.

[0045] Embodiment III

[0046] In Embodiment II, the design of the extrusion component is lacking, and at the same time, the linkage structure design of the cooling component and the extrusion component is lacking;

[0047] Wherein, the extrusion component includes an extrusion block 21, a spiral tube 22, an output rod 23, and a hydraulic pump 24;

[0048] The hydraulic pump 24 is installed on the top of the test chamber 11. The hydraulic pump 24 is drivingly connected to the output rod 23. Threads are provided on the outer side of the bottom end of the output rod 23; the bottom of the spiral tube 22 is connected to the output rod 23 by a threaded engagement connection. The extrusion block 21 is installed at the bottom end of the output rod 23, and the bottom of the extrusion block 21 is used to extrude the battery pack 14.

[0049] Preferably, (different extrusion heads can be replaced through threaded connection to be applicable to battery packs of different sizes and models. At the same time, after the battery pack 14 catches fire, by replacing the extrusion block 21 and the spiral tube 22, the overall damage to the test bench can be further reduced)

[0050] Among them, the temperature reduction component includes an extrusion shell 71, a connecting pipe 72, a solenoid valve 73, air holes 74, a fixing piece 75, an intermediate ring 76 and a phase change cavity 77; the extrusion block 21 is arranged as a cylindrical cavity, the spiral pipe 22 is arranged as a hollow outer pipe, the extrusion block 21 and the spiral pipe 22 are communicated, the inner bottom wall of the extrusion block 21 is provided with the extrusion shell 71, the extrusion shell 71 shares the same bottom wall with the extrusion block 21 and the diameter of the extrusion shell 71 is smaller than that of the extrusion block 21, and the diameter of the extrusion shell 71 is larger than any side length of the battery pack 14. The middle part of the top end of the extrusion shell 71 is communicated with the connecting pipe 72, the connecting pipe 72 is arranged as a hollow inner pipe, the middle part of the connecting pipe 72 is provided with the solenoid valve 73, the connecting pipe 72 is fixedly connected with the spiral pipe 22 through the fixing piece 75, and the air holes 74 evenly distributed are arranged on the side wall of the connecting pipe 72 between the solenoid valve 73 and the fixing piece 75. An intermediate ring 76 is further arranged between the inside of the extrusion block 21 and the outside of the extrusion shell 71, the intermediate ring 76 is fixedly installed on the outside of the connecting pipe 72, and the phase change cavity 77 is installed at one end of the top of the intermediate ring 76 far away from the extrusion block 21; spray holes 78 evenly distributed are arranged on the bottom wall of the extrusion block 21 outside the extrusion shell 71.

[0051] As a further solution of this embodiment, a liquid is arranged inside the extrusion shell 71, and the liquid is vaporized after absorbing heat when the battery pack 14 catches fire; (it can be water) the solenoid valve 73 is arranged as a one-way valve, and gas can only flow unidirectionally from the inside of the extrusion shell 71 to the outside of the extrusion shell 71; the phase change cavity 77 is arranged as a phase change material, and the phase change material is solid at normal temperature and liquid after absorbing heat (it can be wax); a water inlet hole 81 is further arranged inside the extrusion shell 71.

[0052] In this embodiment, first, the liquid enters the inside of the extrusion shell 71 through the water inlet hole 81, and then the extrusion block 21 is installed; in the working state, after the extrusion block 21 drives the bottom wall of the extrusion shell 71 to abut against the battery pack 14, when the battery pack 14 catches fire, the liquid in the extrusion shell 71 is vaporized after absorbing heat and discharged through the solenoid valve 73 and the air holes 74. The air flow releases heat to be liquid after passing through the phase change cavity 77 and the intermediate ring 76, and then the liquid is sprayed onto the outer wall of the battery pack 14 through the 78. The rapid extinguishing of the battery pack 14 is realized, the damage of the extrusion head 21 is prevented, and the service life of the device is further enhanced.

[0053] Embodiment 4, please refer to Figures 1-8 ;

[0054] In this embodiment, the linkage structure design of the temperature reduction component and the support component is further increased to realize the discharge of water flow.

[0055] The limiting component includes a limiting key 46, a limiting groove 47, a water-permeable cotton 61, water-filtering holes 62, a water pipe 63, and a water tank 64;

[0056] The left and right side walls of the test chamber 11 are symmetrically provided with the limiting grooves 47. Both ends of the bottom support plate 41 are fixedly connected with the limiting keys 46. The limiting keys 46 are slidably arranged inside the corresponding limiting grooves 47. The middle of the limiting keys 46 is fixedly installed with the water-permeable cotton 61. A plurality of the water-filtering holes 62 are formed in the water-permeable cotton 61. The bottoms of the plurality of water-filtering holes 62 are commonly connected with the water pipe 63. The side wall of the test chamber 11 is provided with the water tank 64 corresponding to the bottom of the water pipe 63; the water pipe 63 is an elastic hose.

[0057] In this embodiment, (after the outer wall of the battery pack 14 is sprayed with liquid, the fire is quickly extinguished, and then the water flows through the water-filtering holes 62 into the water pipe 63 and is discharged from the water tank 64)

[0058] As a further solution of this embodiment, the support component includes a sliding rod 43, a support sleeve 44, and a support spring 45; a plurality of the sliding rods 43 are installed at the bottom of the buffer plate 42. There are at least two sliding rods 43. The sliding rods 43 are slidably arranged inside the support sleeve 44. The support spring 45 is arranged between the support sleeve 44 and the sliding rod 43. The support spring 45 drives the sliding rod 43 to move away from the support sleeve 44. The support component further includes an elastic key 51 and a fixed key 52. The elastic key 51 is further installed on the bottom wall of the test chamber 11. The fixed key 52 is installed at the bottom of the buffer plate 42. The elastic key 51 and the fixed key 52 are correspondingly arranged. When the elastic key 51 and the fixed key 52 are in contact, the solenoid valve 73 is opened.

[0059] Among them, when the battery pack 14 is placed on the top of the bottom support plate, the support component drives the bottom support plate 41 to slide, and the elastic key 51 and the fixed key 52 are in contact. At this time, the solenoid valve 73 is opened; when the extrusion block 21 extrudes the battery pack 14, the support component drives the bottom support plate 41 to continue sliding to the bottom limit position and starts to be extruded. The elastic key 51 contracts. At this time, the elastic key 51 and the fixed key 52 are always in contact.

[0060] In this embodiment, through the linkage structure design of the elastic key 51, the fixed key 52, and the solenoid valve 73, the solenoid valve will only open when the battery pack 14 is placed on the test bench, preventing the cooling device from being accidentally opened due to other external factors, resulting in water spraying on the battery and causing accidental damage to the battery.

Claims

1. An extrusion test device for a battery pack extrusion test bench, comprising a test box and a battery pack, characterized in that: It also includes a supporting assembly, an extruding assembly, a cooling assembly and a synchronization assembly; The test box is a closed box, the bottom of the test box is provided with the support assembly, the top of the support assembly forms a test bench for testing the battery pack, the top of the support assembly is provided with the extrusion assembly, the inside of the extrusion assembly is provided with a cooling assembly, and the inside of the support assembly is also provided with a synchronization assembly; the support assembly buffers the pressure of the extrusion assembly and the battery pack on the bottom wall of the test box by sliding, the synchronization assembly is used to control the battery pack to be arranged corresponding to the center of the extrusion assembly, the extrusion assembly is used to test the pressure resistance of the battery pack, and after the battery pack catches fire, the cooling assembly realizes rapid fire extinguishing of the outer wall of the battery pack under the action of the phase change material; The support assembly includes a bottom support plate and a buffer plate, the bottom support plate is set as an explosion-proof layer, the bottom of the bottom support plate is detachably connected to the buffer plate, the synchronization assembly is arranged in the bottom support plate, the limiting assemblies are arranged on both sides of the bottom support plate, and the bottom of the buffer plate is provided with a sliding assembly, and the sliding assembly drives the bottom support plate and the buffer plate to slide in the test box; The extrusion assembly includes an extrusion block, a spiral tube, an output rod, and a hydraulic pump; The hydraulic pump is installed on the top of the test box, and the hydraulic pump is drivingly connected to the output rod, and the outer side of the bottom end of the output rod is provided with a thread; the bottom of the spiral tube is connected to the output rod by a threaded engagement connection, and the extrusion block is installed at the bottom end of the output rod, and the bottom of the extrusion block is used to extrude the battery pack; The cooling component includes an extrusion shell, a connecting pipe, a solenoid valve, an air hole, a fixing plate, an intermediate ring and a phase change cavity; The extrusion block is configured as a cylindrical cavity, the spiral tube is configured as a hollow outer tube, the extrusion block and the spiral tube are communicated, the extrusion shell is installed on the inner bottom wall of the extrusion block, the extrusion shell and the extrusion block share the same bottom wall and the diameter of the extrusion shell is smaller than the diameter of the extrusion block, and the diameter of the extrusion shell is greater than any side length of the battery pack, the middle part of the top end of the extrusion shell is communicated with the connecting tube, the connecting tube is configured as a hollow inner tube, a solenoid valve is provided in the middle part of the connecting tube, the connecting tube is fixedly connected to the spiral tube through the fixing plate, the side wall of the connecting tube located between the solenoid valve and the fixing plate is provided with evenly distributed pores, the intermediate ring is further provided between the inside of the extrusion block and the outside of the extrusion shell, the intermediate ring is fixedly installed on the outside of the connecting tube, and the phase change cavity is installed on the top end of the intermediate ring away from the extrusion block; the bottom wall of the extrusion block is located on the outside of the extrusion shell and is provided with evenly distributed spray holes.

2. The extrusion test device for a battery pack extrusion test bench according to claim 1, characterized in that: A closed door is installed on the front side of the test box, and an observation window and a handle are installed on the closed door. A top plate is also installed in the test box, and the spiral tube passes through the top plate and extends between the top plate and the bottom support plate. When the closed door is closed, the closed door and the rear wall of the test box, the top plate and the bottom support plate form a closed space, and the closed space is used to reduce the contact between the outside air and the battery pack, thereby preventing the battery pack from fully burning.

3. The extrusion test device for a battery pack extrusion test bench according to claim 1, characterized in that: Liquid is arranged in the extruded shell, and the liquid is vaporized after absorbing heat when the battery pack catches fire; the solenoid valve is arranged as a one-way valve, and the gas can only flow from the inside of the extruded shell to the outside of the extruded shell in one direction; the phase change cavity is arranged as a phase change material, and the phase change material is solid at room temperature and liquid after absorbing heat; a water inlet hole is also opened in the extruded shell.

4. The extrusion test device for a battery pack extrusion test bench according to claim 3, characterized in that: The limit assembly includes a limit key, a limit groove, a water-permeable cotton, a water filter hole, a water pipe and a water tank; The limit grooves are symmetrically provided on the left and right side walls of the test box, the limit keys are fixedly connected at both ends of the bottom support plate, the limit keys are slidably arranged inside the corresponding limit grooves, the water-permeable cotton is fixedly installed in the middle of the limit keys, a plurality of water filter holes are provided on the water-permeable cotton, the bottoms of the plurality of water filter holes are commonly connected to the water pipe, the water trough is provided on the side wall of the test box corresponding to the bottom of the water pipe; the water pipe is arranged as an elastic hose.

5. The extrusion test device for a battery pack extrusion test bench according to claim 4, characterized in that: The synchronization assembly includes a synchronization block, a driving groove, a driving shaft, a driving gear, a synchronization rod and a connecting groove; The top of the bottom support plate is provided with two symmetrically arranged communicating grooves, the middle of the bottom support plate is provided with the driving groove, the communicating grooves on both sides are connected with the driving groove, the middle of the driving groove is rotatably connected with the driving shaft, the outer side of the driving shaft is fixedly connected with the driving gear, the two ends of the driving gear are symmetrically installed with the synchronization rods, the end of the synchronization rod close to the driving groove is connected with the driving gear through gear meshing, the end of the synchronization rod away from the driving groove is slidably installed on the side wall of the driving groove, the ends of the synchronization rods on both sides away from each other are fixedly connected with the synchronization blocks, the top of the synchronization block passes through the communicating groove and is movably abutted against the battery pack.

6. The extrusion test device for a battery pack extrusion test bench according to claim 5, characterized in that: The support assembly includes a sliding rod, a support sleeve and a support spring; A plurality of sliding rods are installed at the bottom of the buffer plate, and there is at least one sliding rod. The sliding rod is slidably arranged inside the support sleeve. A support spring is arranged between the support sleeve and the sliding rod, and the support spring drives the sliding rod away from the support sleeve.

7. The extrusion test device for a battery pack extrusion test bench according to claim 6, characterized in that: The support assembly also includes an elastic key and a fixed key. The bottom wall of the test box is also equipped with the elastic key. The bottom of the buffer plate is equipped with the fixed key. The elastic key and the fixed key are correspondingly arranged. When the elastic key and the fixed key are in contact, the solenoid valve opens.

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