An extrusion test device for a battery pack housing

Abstract

The present invention relates to the field of housing testing, and particularly to an extrusion testing device for a battery pack housing. Existing testing devices are prone to generating additional extrusion forces when clamping the housing, and are likely to offset a part of the extrusion force due to the positioning plate for positioning the housing during extrusion, which affects the data of the extrusion test. Moreover, it is not convenient to switch different extrusion methods, making the extrusion test incomplete. An extrusion testing device for a battery pack housing includes a bottom plate, etc.; two support rails are fixedly connected to the bottom plate, and electric sliders are slidably connected to both of the two support rails. A connecting long rod is fixedly connected between the two electric sliders, and hydraulic rods are fixedly connected to both sides of the bottom plate. Rotate the rocking crank, and drive the clamping plate to clamp the side wall of the housing through magnetism, so that it is not easy to generate additional extrusion when the clamping plate clamps the housing, and thus it is not easy to affect the extrusion test of the side wall of the housing.

Description

Technical Field

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

[0002] The battery pack housing is an important component for protecting battery safety. Its shapes are mainly divided into three types: square, cylindrical, and soft pack. The square housing is usually in a regular flat structure, mostly made of aluminum alloy or stainless steel. In order to verify the safety protection ability of the housings made of these materials under extreme mechanical loads, it is necessary to conduct extrusion tests on the housings.

[0003] However, when the existing testing devices clamp the housing, it is easy to generate additional extrusion forces. During extrusion, part of the extrusion force is offset by the positioning plate used to position the housing, which affects the data of the extrusion test. Moreover, it is not convenient to switch different extrusion methods, making the extrusion test not comprehensive enough. Summary of the Invention

[0004] Aiming to overcome the disadvantages in the background art, the present invention provides an extrusion testing device for a battery pack housing that is not easy to generate additional pressure when clamping the housing, is convenient to remove the positioning plate before extrusion, and is convenient to switch different extrusion methods.

[0005] The technical solution of the present invention is as follows: An extrusion testing device for a battery pack housing includes a bottom plate. There are two placement grooves opened on the bottom plate. Two support rails are fixedly connected to the bottom plate, and the two support rails are symmetrically distributed. Electric sliders are slidably connected to both support rails. A connecting long rod is fixedly connected between the two electric sliders. Hydraulic rods are fixedly connected to both sides of the bottom plate. An extrusion disc is fixedly connected to the telescopic rod of each hydraulic rod. Positioning mechanisms are arranged on both sides of the connecting long rod. The positioning mechanisms are used to position the position of the battery pack housing. Clamping mechanisms are arranged on the positioning mechanisms. The clamping mechanisms are used to clamp the housing.

[0006] As a preferred technical solution of the present invention, the positioning mechanism includes two side plates. A number of round holes are opened on the side plates. Sliding columns are slidably connected to both side plates. Through holes are opened in the upper parts of the sliding columns. A limiting frame is fixedly connected to the upper part of each sliding column. A pulling and clamping rod is slidably connected to each limiting frame. The pulling and clamping rod passes through the through hole in the upper part of the sliding column and one of the round holes on the side plate. A return spring is connected between the pulling and clamping rod and the sliding column. A laser pen is fixedly connected to one side of each sliding column. Positioning plates are placed in the two placement grooves on the bottom plate. Support springs are connected between the positioning plates and the bottom plate.

[0007] As a preferred technical solution of the present invention, the clamping mechanism includes four bent rods. Two of the bent rods form a group, and the two groups of bent rods are respectively fixedly connected to the two sliding columns. A threaded cylinder is rotatably connected to the lower part of each bent rod. Two of the threaded cylinders form a group, and a clamping plate is threadedly connected to each threaded cylinder. A limiting round rod is fixedly connected between the two bent rods of each group. The limiting round rod passes through the upper part of the clamping plate. One end of one of the side plates is fixedly connected to a side rod. A rocking curved rod is rotatably connected to the lower part of the side rod. A rotating cylinder is rotatably connected between the two threaded cylinders of each group. A transmission rotating rod passes through between the two rotating cylinders. One end of the transmission rotating rod is connected to the rocking curved rod. A plurality of magnet blocks are fixedly connected to the surface of each rotating cylinder. Two magnet strips are fixedly connected to the inner wall of each threaded cylinder. The magnet strips and the magnet blocks have opposite magnetic polarities.

[0008] As a preferred technical solution of the present invention, the thread directions of the two threaded cylinders of each group are opposite.

[0009] As a preferred technical solution of the present invention, a disk changing mechanism is further included. The disk changing mechanism is arranged on the bottom plate and is used for switching different extrusion methods. The disk changing mechanism includes four right-angle bars. Two of the right-angle bars form a group, and the four right-angle bars are all fixedly connected to the bottom plate. The two right-angle bars of each group are symmetrically distributed. Right-angle long plates are fixedly connected to both sides of the bottom plate. Two guiding sliders are slidably connected between each group of two right-angle bars and the right-angle long plate on the same side. Two of the guiding sliders form a group, and a pulling frame is fixedly connected between the two guiding sliders of each group. A first sleeve disk, a second sleeve disk and a third sleeve disk are placed between each group of two right-angle bars and the right-angle long plate on the same side. The first sleeve disk, the second sleeve disk and the third sleeve disk are all in contact with the pulling frame. A metal iron block is fixedly connected to the upper part of each of the first sleeve disk, the second sleeve disk and the third sleeve disk. Support bent frames are fixedly connected to both sides of the bottom plate. A magnetic force sliding rod is slidably connected to each support bent frame. A return spring is connected between the magnetic force sliding rod and the support bent frame. The metal iron block on the upper part of the second sleeve disk is in contact with one side of the magnetic force sliding rod.

[0010] As a preferred technical solution of the present invention, a convex strip is arranged on the side surface of the first sleeve disk, a flat convex block is arranged on the side surface of the second sleeve disk, and a convex column is arranged on the side surface of the third sleeve disk.

[0011] As a preferred technical solution of the present invention, it also includes a lowering plate mechanism, which is arranged on the bottom plate, and is used to lower the positioning object. The lowering plate mechanism includes a connecting rod, which is fixedly connected to one end of the side plate away from the side rod, and the lower part of the connecting rod is rotatably connected to bevel gear one and bevel gear two, and the bevel gear two is meshed with the bevel gear one, and the bevel gear one is connected to one end of the transmission rotating rod, and the lower part of the bevel gear two is fixedly connected to a transmission clamping rod, and one side of the bottom plate is fixedly connected to a supporting circular plate, and a threaded sleeve rod is rotatably connected to the supporting circular plate, and a clamping groove is opened on the upper part of the threaded sleeve rod, and an extrusion frame is connected to the threaded sleeve rod through a thread, and the lower part of the extrusion frame passes through the supporting circular plate, and a connecting frame is fixedly connected between the two positioning plates, and the threaded sleeve rod passes through the middle of the connecting frame.

[0012] The beneficial effects of the present invention are as follows: 1. The crank arm is rotated to drive the clamping plate to clamp the side wall of the shell through magnetic force. The squeezing force of each clamping plate on the side wall of the shell is more consistent, so that it is not easy to generate additional squeezing when the clamping plate clamps the shell, thereby not easily affecting the shell side wall squeezing test.

[0013] 2. By moving the pulling frame horizontally, the sleeve disc 1, sleeve disc 2 and sleeve disc 3 with different side protrusions are driven to move horizontally together, so as to switch different extrusion methods, making the extrusion test more comprehensive.

[0014] 3. The electric slider drives the side plate, connecting rod and transmission clamp rod to drive the threaded sleeve rod to insert into the slot; the crankshaft is shaken to drive the transmission clamp rod and the threaded sleeve rod to rotate through the bevel gear set, pushing the extrusion frame to move down, and the crankshaft is continuously rotated to make the extrusion frame press the connecting frame, driving the positioning plate to move down until the positioning plate is out of contact with the shell. When the shell is squeezed and deformed, the extrusion force on both sides may become uneven, and the positioning plate in contact with the shell may bear part of the extrusion force. The positioning plate is withdrawn downward, so that when the positioning plate is squeezed on the side of the shell, it will not offset part of the extrusion force, thereby improving the data accuracy of the extrusion test. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0016] Figure 2 It is a three-dimensional structural schematic diagram of the positioning mechanism of the present invention.

[0017] Figure 3 It is a schematic diagram of the separated three-dimensional structure of the positioning mechanism of the present invention.

[0018] Figure 4 It is a partial three-dimensional structural schematic diagram of the positioning mechanism of the present invention.

[0019] Figure 5 Schematic three-dimensional structure diagram of the clamping mechanism of the present invention.

[0020] Figure 6 Schematic separated three-dimensional structure diagram of the clamping mechanism of the present invention.

[0021] Figure 7 Schematic sectional three-dimensional structure diagram of the threaded cylinder of the present invention.

[0022] Figure 8 Schematic three-dimensional structure diagram of the disk changing mechanism of the present invention.

[0023] Figure 9 Partial three-dimensional structure diagram of the disk changing mechanism of the present invention.

[0024] Figure 10 Schematic three-dimensional structure diagram of the plate lowering mechanism of the present invention.

[0025] Figure 11 For the present invention Figure 10 Enlarged three-dimensional structure diagram at position A in the present invention.

[0026] The marks in the figure are: 1 - bottom plate, 21 - support guide rail, 22 - electric slider, 23 - connecting long rod, 31 - hydraulic rod, 32 - extrusion disc, 41 - side plate, 42 - sliding column, 43 - limiting frame, 44 - lifting latch rod, 45 - return spring, 46 - laser pointer, 47 - positioning plate, 48 - support spring, 51 - bent rod, 52 - threaded cylinder, 53 - clamping plate, 54 - limiting round rod, 55 - side rod, 56 - rocking crank, 57 - rotating cylinder, 58 - transmission rotating rod, 59 - magnet block, 510 - magnet strip, 61 - right-angle strip, 62 - right-angle long plate, 63 - guiding slider, 64 - pulling frame, 65 - first sleeve disc, 66 - second sleeve disc, 67 - third sleeve disc, 68 - metal iron block, 69 - support bent frame, 610 - magnetic sliding rod, 611 - reset spring, 71 - connecting rod, 72 - first bevel gear, 73 - second bevel gear, 74 - transmission latch rod, 75 - support circular plate, 76 - threaded sleeve rod, 77 - extrusion frame, 78 - connecting frame. Detailed implementation manners

[0027] The present invention will be specifically described below with reference to the accompanying drawings.

[0028] Embodiment 1

[0029] A battery pack housing extrusion test device, as Figures 1-11As shown in the figure, it includes a bottom plate 1. There are two placement slots on the bottom plate 1. Two support guide rails 21 are fixedly connected to the bottom plate 1. The two support guide rails 21 are symmetrically distributed. Electric sliders 22 are slidably connected to both of the two support guide rails 21. A connecting long rod 23 is fixedly connected between the two electric sliders 22. Hydraulic rods 31 are fixedly connected to both sides of the bottom plate 1. An extrusion disc 32 is fixedly connected to the telescopic rod of each hydraulic rod 31. Positioning mechanisms are arranged on both sides of the connecting long rod 23. The positioning mechanisms are used to position the position of the battery pack housing. A clamping mechanism is arranged on the positioning mechanism. The clamping mechanism is used to clamp the housing.

[0030] The positioning mechanism includes two side plates 41. A number of round holes are opened on the side plates 41. Sliding columns 42 are slidably connected to both of the two side plates 41. Through holes are opened in the upper parts of the sliding columns 42. A limiting frame 43 is fixedly connected to the upper part of each sliding column 42. A lifting latch rod 44 is slidably connected to each limiting frame 43. The lifting latch rod 44 passes through the through hole in the upper part of the sliding column 42 and one of the round holes on the side plate 41. A return spring 45 is connected between the lifting latch rod 44 and the sliding column 42. A laser pen 46 is fixedly connected to one side of each sliding column 42. Positioning plates 47 are placed in the two placement slots on the bottom plate 1. A support spring 48 is connected between the positioning plate 47 and the bottom plate 1.

[0031] The clamping mechanism includes four bent rods 51. Two of the bent rods 51 form a group. The two groups of bent rods 51 are respectively fixedly connected to the two sliding columns 42. A threaded cylinder 52 is rotatably connected to the lower part of each bent rod 51. Two of the threaded cylinders 52 form a group. A clamping plate 53 is threadedly connected to each threaded cylinder 52. A limiting round rod 54 is fixedly connected between the two bent rods 51 in each group. The limiting round rod 54 passes through the upper part of the clamping plate 53. A side rod 55 is fixedly connected to one end of one of the side plates 41. A rocking curved rod 56 is rotatably connected to the lower part of the side rod 55. A rotating cylinder 57 is rotatably connected between the two threaded cylinders 52 in each group. A transmission rotating rod 58 passes through between the two rotating cylinders 57. One end of the transmission rotating rod 58 is connected to the rocking curved rod 56. A number of magnet blocks 59 are fixedly connected to the surface of each rotating cylinder 57. Two magnet strips 510 are fixedly connected to the inner wall of each threaded cylinder 52. The magnet strips 510 and the magnet blocks 59 have opposite magnetic polarities.

[0032] The thread directions on the surfaces of the two threaded cylinders 52 in each group are opposite.

[0033] In an actual extrusion test, the square shell of the battery pack is divided into upper and lower parts, and both are hull structures with an opening on one side. The operator needs to perform extrusion tests on each side of the shell respectively. First, the operator horizontally places the shell on the bottom plate 1 and aligns two corners of the square shell with the right angle of the positioning plate 47. The spacing at different positions between the two positioning plates 47 enables the square shell to achieve a positioning effect in both the horizontal and vertical states. Then, the operator lifts the lifting rod 44 upward, stretching the return spring 45, so that the lifting rod 44 contacts the upper part of the limiting frame 43. At this time, the lifting rod 44 no longer passes through the through hole in the upper part of the sliding column 42 and one of the circular holes on the side plate 41. Then, after the operator lifts the lifting rod 44 upward, the operator can horizontally move the lifting rod 44 to drive the sliding column 42 to move horizontally together. Then, the operator observes the laser emitted by the laser pen 46 to position whether the sliding column 42 is above the side of the shell. After the operator determines the position, the operator lowers the lifting rod 44 so that the lifting rod 44 is reinserted into one of the circular holes on the side plate 41. Then, the operator starts the electric slider 22, and the electric slider 22 drives the connecting long rod 23 and the side plate 41 to move downward a certain distance. Then, the downward movement of the side plate 41 will drive the sliding column 42 and the clamping plate 53 to move downward a certain distance. After the clamping plate 53 moves downward a certain distance, the two clamping plates 53 in each group are located on both sides of the side wall of the shell. Then, the operator rotates the rocking crank 56. The rotation of the rocking crank 56 will drive the rotating cylinder 57 to rotate together. The rotation of the rotating cylinder 57 will drive the magnet block 59 to rotate together. Since the magnet block 59 and the magnet strip 510 have opposite magnetic polarities, the rotation of the magnet block 59 will drive the magnet strip 510 to rotate together through magnetic force. The rotation of the magnet strip 510 will drive the threaded cylinder 52 to rotate. Since the threads on the two threaded cylinders 52 in the same group are opposite, the rotation of the threaded cylinder 52 will drive the two clamping plates 53 to move horizontally towards each other through the threads. Then, the horizontal movement of the clamping plate 53 will contact and clamp the side wall of the shell. When the force exerted by the clamping plate 53 on the side wall of the shell reaches a certain value, the magnetic force between the magnet block 59 and the magnet strip 510 cannot make the rotating cylinder 57 drive the threaded cylinder 52 to rotate together, so the clamping plate 53 stops moving. Before the force exerted by the clamping plate 53 on the side wall of the shell reaches a certain value, continuing to rotate the rocking crank 56 can continue to drive the clamping plate 53 to move horizontally. In this way, the extrusion force of each clamping plate 53 on the side wall of the shell is more consistent, making it not easy to generate additional extrusion when the clamping plate 53 clamps the shell, and thus not easily affecting the extrusion test of the side wall of the shell. After the clamping is completed, the operator starts the hydraulic rods 31 on both sides, and the telescopic rods of the hydraulic rods 31 drive the extrusion disks 32 to perform extrusion tests on two sides of the shell.

[0034] Embodiment 2

[0035] On the basis of Embodiment 1, as Figures 8-9As shown in the figure, it further includes a disc changing mechanism. The disc changing mechanism is arranged on the bottom plate 1. The disc changing mechanism is used to switch different extrusion methods. The disc changing mechanism includes four right-angle bars 61. Two of the right-angle bars 61 form a group. All four right-angle bars 61 are fixedly connected to the bottom plate 1. The two right-angle bars 61 in each group are symmetrically distributed. Right-angle long plates 62 are fixedly connected to both sides of the bottom plate 1. Two guiding sliders 63 are slidably connected between each group of two right-angle bars 61 and the right-angle long plate 62 on the same side. Two of the guiding sliders 63 form a group. A pulling frame 64 is fixedly connected between the two guiding sliders 63 in each group. A first sleeve disc 65, a second sleeve disc 66 and a third sleeve disc 67 are placed between each group of two right-angle bars 61 and the right-angle long plate 62 on the same side. The first sleeve disc 65, the second sleeve disc 66 and the third sleeve disc 67 are all in contact with the pulling frame 64. A metal iron block 68 is fixedly connected to the upper part of each of the first sleeve disc 65, the second sleeve disc 66 and the third sleeve disc 67. Support bent frames 69 are fixedly connected to both sides of the bottom plate 1. A magnetic force sliding rod 610 is slidably connected to each of the support bent frames 69. A return spring 611 is connected between the magnetic force sliding rod 610 and the support bent frame 69. The metal iron block 68 on the upper part of the second sleeve disc 66 is in contact with one side of the magnetic force sliding rod 610.

[0036] The side of the first sleeve disc 65 is provided with a convex strip. The side of the second sleeve disc 66 is provided with a flat convex block. The side of the third sleeve disc 67 is provided with a convex column.

[0037] When the telescopic rod of the hydraulic rod 31 extends and drives the extrusion disc 32 to move horizontally, after the extrusion disc 32 moves horizontally for a certain distance, it will contact the second sleeve disc 66. Then, when the extrusion disc 32 continues to move horizontally, it will drive the second sleeve disc 66 to move horizontally together. Since the metal iron block 68 is attracted by the magnetic force sliding rod 610, the horizontal movement of the second sleeve disc 66 will drive the magnetic force sliding rod 610 to move horizontally together, and the return spring 611 is stretched. Then, the extrusion disc 32 pushes the second sleeve disc 66 to move horizontally and extrudes the side wall of the outer shell. When the extrusion is completed, the telescopic rod of the hydraulic rod 31 contracts, driving the extrusion disc 32 to reset. The return spring 611 contracts, driving the second sleeve disc 66 to move horizontally and reset together. After the reset is completed, the operator can push the pulling frame 64 to move horizontally. The horizontal movement of the pulling frame 64 will drive the first sleeve disc 65, the second sleeve disc 66 and the third sleeve disc 67 to move horizontally together, so that the metal iron block 68 on the second sleeve disc 66 is separated from the contact with the magnetic force sliding rod 610, and the metal iron block 68 on the first sleeve disc 65 is in contact with the magnetic force sliding rod 610. Similarly, the pulling frame 64 can be pulled to move horizontally so that the metal iron block 68 on the third sleeve disc 67 is in contact with the magnetic force sliding rod 610. Since the sides of the first sleeve disc 65, the second sleeve disc 66 and the third sleeve disc 67 are of different shapes, this can facilitate the switching of different extrusion methods when the extrusion disc 32 extrudes the side wall of the outer shell, making the extrusion test more comprehensive.

[0038] Example 3

[0039] Based on Example 2, as Figures 10-11 shown, it further includes a descending plate mechanism. The descending plate mechanism is arranged on the bottom plate 1 and is used to lower the positioning object. The descending plate mechanism includes a connecting rod 71. The connecting rod 71 is fixedly connected to one end of the side plate 41 far from the side rod 55. A bevel gear one 72 and a bevel gear two 73 are rotatably connected to the lower part of the connecting rod 71. The bevel gear two 73 meshes with the bevel gear one 72. One end of the bevel gear one 72 is connected to the transmission rotating rod 58. A transmission clamping rod 74 is fixedly connected to the lower part of the bevel gear two 73. A support circular plate 75 is fixedly connected to one side of the bottom plate 1. A threaded sleeve rod 76 is rotatably connected to the support circular plate 75. A card slot is opened in the upper part of the threaded sleeve rod 76. An extrusion frame 77 is connected to the threaded sleeve rod 76 by threads. The lower part of the extrusion frame 77 passes through the support circular plate 75. A connecting frame 78 is fixedly connected between the two positioning plates 47. The threaded sleeve rod 76 passes through the middle of the connecting frame 78.

[0040] When the operator starts the electric slider 22 to drive the side plate 41 to move downward by a certain distance, the downward movement of the side plate 41 will drive the connecting rod 71 and the transmission rotating rod 58 to move downward together. The downward movement of the connecting rod 71 will drive the transmission clamping rod 74 to move downward by a certain distance. After the transmission clamping rod 74 moves downward by a certain distance, it will be inserted into the card slot in the upper part of the threaded sleeve rod 76. Then when the operator rotates the rocking crank 56 to drive the clamping plate 53 to clamp the side wall of the outer shell, the rotation of the rocking crank 56 will drive the bevel gear one 72 to rotate. The bevel gear one 72 will drive the transmission clamping rod 74 to rotate together through the bevel gear two 73. The rotation of the transmission clamping rod 74 will drive the threaded sleeve rod 76 to rotate. The rotation of the threaded sleeve rod 76 will drive the extrusion frame 77 to move downward through the threads. After the clamping plate 53 squeezes and clamps the side wall of the outer shell, when the rocking crank 56 is continuously rotated, the extrusion frame 77 will continue to move downward and then squeeze the connecting frame 78, and drive the connecting frame 78 to move downward continuously together. The downward movement of the connecting frame 78 by a certain distance will drive the two positioning plates 47 to move downward by a certain distance, and the support spring 48 is compressed. After the two positioning plates 47 move downward by a certain distance, the upper surfaces of the two positioning plates 47 will be lower than the upper surface of the bottom plate 1. In this way, the two positioning plates 47 will no longer contact the outer shell. When the outer shell is deformed by extrusion, the extrusion forces on its two sides may become uneven, and the positioning plates 47 in contact with the outer shell may bear a part of the extrusion force. Removing the positioning plates 47 downward will not cause the positioning plates 47 to offset a part of the extrusion force when the side of the outer shell is squeezed, thereby improving the data accuracy of the extrusion test.

[0041] Those skilled in the art should understand that the above embodiments do not limit the present invention in any form. Any technical solutions obtained by means of equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A battery pack shell extrusion test device, characterized in that: The invention comprises a bottom plate (1), wherein two placement grooves are formed on the bottom plate (1), two support guide rails (21) are fixedly connected to the bottom plate (1), the two support guide rails (21) are symmetrically distributed, the two support guide rails (21) are slidably connected to electric sliders (22), a connecting rod (23) is fixedly connected between the two electric sliders (22), hydraulic rods (31) are fixedly connected to both sides of the bottom plate (1), a pressing plate (32) is fixedly connected to the telescopic rod of each hydraulic rod (31), positioning mechanisms are arranged on both sides of the connecting rod (23), the positioning mechanisms are used to locate the position of the battery pack shell, and a clamping mechanism is arranged on the positioning mechanism, and the clamping mechanism is used to clamp the shell; The positioning mechanism comprises two side plates (41), the side plates (41) are provided with a plurality of circular holes, the two side plates (41) are slidably connected with a sliding column (42), the upper part of the sliding column (42) is provided with a through hole, the upper part of each sliding column (42) is fixedly connected with a limiting frame (43), each limiting frame (43) is slidably connected with a lifting card rod (44), the lifting card rod (44) passes through the through hole on the upper part of the sliding column (42) and one of the circular holes on the side plates (41), a return spring (45) is connected between the lifting card rod (44) and the sliding column (42), one side of each sliding column (42) is fixedly connected with a laser pen (46), and positioning plates (47) are placed in two placement grooves on the bottom plate (1), and a support spring (48) is connected between the positioning plate (47) and the bottom plate (1); The clamping mechanism comprises four bent rods (51), two of the bent rods (51) form a group, the two groups of bent rods (51) are respectively fixedly connected to the two sliding columns (42), the lower part of each bent rod (51) is rotatably connected to a threaded cylinder (52), the two threaded cylinders (52) form a group, each threaded cylinder (52) is connected to a clamping plate (53) by threading, and a limiting round rod (54) is fixedly connected between the two bent rods (51) in each group, the limiting round rod (54) passes through the upper part of the clamping plate (53), and one end of one of the side plates (41) is fixedly connected to the clamping plate (53). A side rod (55) is fixedly connected, and a rocking crank rod (56) is rotatably connected to the lower part of the side rod (55). A rotating cylinder (57) is rotatably connected between the two threaded cylinders (52) in each group. A transmission rotating rod (58) passes between the two rotating cylinders (57), and one end of the transmission rotating rod (58) is connected to the rocking crank rod (56). A plurality of magnet blocks (59) are fixedly connected to the surface of each rotating cylinder (57), and two magnet bars (510) are fixedly connected to the inner wall of each threaded cylinder (52), and the magnet bars (510) and the magnet blocks (59) have opposite magnetic properties.

2. A battery pack shell compression test device according to claim 1, characterized in that: The threads on the surfaces of the two threaded barrels (52) in each group are in opposite directions.

3. A battery pack shell compression test device as claimed in claim 1, characterized in that: The invention also includes a disc changing mechanism, which is arranged on the bottom plate (1) and is used to switch between different extrusion modes. The disc changing mechanism includes four right-angle bars (61), two of which form a group. The four right-angle bars (61) are fixedly connected to the bottom plate (1), and the two right-angle bars (61) in each group are symmetrically distributed. A right-angle long plate (62) is fixedly connected to both sides of the bottom plate (1). Two guide sliders (63) are slidably connected between each group of two right-angle bars (61) and the right-angle long plate (62) on the same side. The two guide sliders (63) form a group. A pulling frame (64) is fixedly connected between the two guide sliders (63) in each group. The two right-angle bars (61) in each group are fixedly connected to the right-angle long plate (62) on the same side. A sleeve disc 1 (65), a sleeve disc 2 (66) and a sleeve disc 3 (67) are placed between the right-angled long plates (62); the sleeve disc 1 (65), the sleeve disc 2 (66) and the sleeve disc 3 (67) are all in contact with the pulling frame (64); a metal iron block (68) is fixedly connected to the upper part of each sleeve disc 1 (65), the sleeve disc 2 (66) and the sleeve disc 3 (67); support bent frames (69) are fixedly connected to both sides of the bottom plate (1); a magnetic slide bar (610) is slidably connected to each support bent frame (69); a return spring (611) is connected between the magnetic slide bar (610) and the support bent frame (69); and the metal iron block (68) on the upper part of the sleeve disc 2 (66) is in contact with one side of the magnetic slide bar (610).

4. A battery pack shell compression test device as claimed in claim 3, characterized in that: The side surface of the sleeve disc one (65) is provided with a convex strip, the side surface of the sleeve disc two (66) is provided with a flat convex block, and the side surface of the sleeve disc three (67) is provided with a convex column.

5. A battery pack shell compression test device as claimed in claim 3, characterized in that: The device also includes a plate lowering mechanism, which is arranged on the bottom plate (1) and is used to lower the positioning object. The plate lowering mechanism includes a connecting rod (71), which is fixedly connected to one end of the side plate (41) away from the side rod (55), and the lower part of the connecting rod (71) is rotatably connected to a bevel gear 1 (72) and a bevel gear 2 (73), and the bevel gear 2 (73) is meshed with the bevel gear 1 (72), and the bevel gear 1 (72) is connected to one end of the transmission rotating rod (58). A transmission clamping rod (74) is fixedly connected to the lower part of the second gear (73); a support circular plate (75) is fixedly connected to one side of the bottom plate (1); a threaded sleeve rod (76) is rotatably connected to the support circular plate (75); a clamping groove is formed at the upper part of the threaded sleeve rod (76); an extrusion frame (77) is connected to the threaded sleeve rod (76) via threads; the lower part of the extrusion frame (77) passes through the support circular plate (75); a connecting frame (78) is fixedly connected between the two positioning plates (47); and the threaded sleeve rod (76) passes through the middle part of the connecting frame (78).

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