Battery pack shell extrusion test device

Abstract

The invention relates to the field of shell testing, in particular to a battery pack shell extrusion testing device. According to an existing testing device, extra extrusion force is easily generated when a shell is clamped, a part of extrusion force is easily counteracted by a positioning plate used for positioning the position of the shell during extrusion, data of an extrusion test is affected, different extrusion modes are inconvenient to switch, and the extrusion test is not comprehensive enough. A battery pack shell extrusion testing device comprises a bottom plate and the like. The device comprises a bottom plate, two supporting guide rails are fixedly connected to the bottom plate, electric sliding blocks are slidably connected to the two supporting guide rails, a connecting long rod is fixedly connected between the two electric sliding blocks, and hydraulic rods are fixedly connected to the two sides of the bottom plate. The rocking cranked lever is rotated, and the clamping plate is driven by magnetic force to clamp the side wall of the shell, so that when the clamping plate clamps the shell, extra extrusion is not easy to generate, and the extrusion test of the side wall of the shell is not easy to influence.

Description

Technical Field

[0001] The present invention relates to the field of shell testing, and in particular to a battery pack shell extrusion testing device. Background Art

[0002] The battery pack shell is an important component for protecting battery safety. Its shapes are mainly divided into three types: square, cylindrical and soft pack. The square shell usually has a regular flat structure and is mostly made of aluminum alloy or stainless steel. In order to verify the safety protection capabilities of the shells made of these materials under extreme mechanical loads, the shells need to be subjected to extrusion tests.

[0003] However, the existing testing device is prone to generate additional extrusion force when clamping the shell. During extrusion, it is easy for the positioning plate used to locate the position of the shell to offset part of the extrusion force, which affects the data of the extrusion test. It is also inconvenient to switch between different extrusion methods, making the extrusion test not comprehensive enough. Summary of the invention

[0004] In order to overcome the shortcomings of the background technology, the present invention provides a battery pack shell extrusion testing device which is not easy to generate additional pressure when clamping the shell, is convenient for removing the positioning plate before extrusion, and is convenient for switching between different extrusion modes.

[0005] The technical solution of the present invention is: a battery pack shell extrusion test device, including a base plate, two placement grooves are opened on the base plate, two support rails are fixedly connected to the base plate, the two support rails are symmetrically distributed, electric sliders are slidably connected to the two support rails, a connecting long rod is fixedly connected between the two electric sliders, hydraulic rods are fixedly connected on both sides of the base plate, an extrusion plate 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 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.

[0006] As a preferred technical solution of the present invention, the positioning mechanism includes two side plates, a plurality of circular holes are opened on the side plates, and sliding columns are slidably connected to the two side plates, and a through hole is opened on the upper part of the sliding column, and each of the sliding columns is fixedly connected to a limiting frame on the upper part, and a lifting card rod is slidably connected to each of the limiting frames, and the lifting card rod passes through the through hole on the upper part of the sliding column and one of the circular holes on the side plates, and a return spring is connected between the lifting card rod and the sliding column, and a laser pen is fixedly connected to one side of each sliding column, and positioning plates are placed in the two placement grooves on the bottom plate, and a support spring is connected between the positioning plate 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, each of the bent rods is rotatably connected to a threaded cylinder, the two threaded cylinders form a group, and each threaded cylinder is threadedly connected to a clamping plate, and a limited round rod is fixedly connected between the two bent rods of each group, and the limited 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, and the lower part of the side rod is rotatably connected to a rotating cylinder, a transmission rotating rod passes between the two rotating cylinders, and one end of the transmission rotating rod is connected to the rocking curved rod, each rotating cylinder surface is fixedly connected to a plurality of magnet blocks, and each threaded cylinder inner wall is fixedly connected to two magnet bars, and the magnet bars have opposite magnetic properties to the magnet blocks.

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

[0009] As a preferred technical solution of the present invention, it also includes a disc changing mechanism, which is arranged on the bottom plate, and is used to switch different extrusion methods. The disc changing mechanism includes four right-angle bars, two of which form a group, and the four right-angle bars are fixedly connected to the bottom plate, and the two right-angle bars in each group are symmetrically distributed. Right-angle long plates are fixedly connected on both sides of the bottom plate, and two guide sliders are slidably connected between each group of two right-angle bars and the right-angle long plates on the same side, and the two guide sliders form a group, and the two guide sliders in each group are connected to each other. A pulling frame is fixedly connected between the two right-angled bars in each group and the right-angled long plate on the same side, and a sleeve disc one, a sleeve disc two and a sleeve disc three are placed, and the sleeve disc one, the sleeve disc two and the sleeve disc three are all in contact with the pulling frame, and a metal iron block is fixedly connected to the upper part of each of the sleeve disc one, the sleeve disc two and the sleeve disc three, and supporting bent frames are fixedly connected on both sides of the bottom plate, and a magnetic slide rod is slidably connected to each of the supporting bent frames, and a reset spring is connected between the magnetic slide rod and the supporting bent frame, and the metal iron block on the upper part of the sleeve disc two is in contact with one side of the magnetic slide rod.

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

[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 It is a schematic diagram of the three-dimensional structure of the clamping mechanism of the present invention.

[0020] Figure 6 It is a schematic diagram of the separated three-dimensional structure of the clamping mechanism of the present invention.

[0021] Figure 7 It is a schematic diagram of the cross-sectional three-dimensional structure of the threaded barrel of the present invention.

[0022] Figure 8 It is a three-dimensional structural schematic diagram of the disk changing mechanism of the present invention.

[0023] Fig. 9 It is a partial three-dimensional structural schematic diagram of the disk changing mechanism of the present invention.

[0024] Fig.10 It is a three-dimensional structural schematic diagram of the plate lowering mechanism of the present invention.

[0025] Fig.11 For the present invention Fig.10 Schematic diagram of the enlarged three-dimensional structure at point A in the middle.

[0026] Markings in the figure are: 1-bottom plate, 21-support rail, 22-electric slider, 23-connecting long rod, 31-hydraulic rod, 32-extrusion plate, 41-side plate, 42-sliding column, 43-limiting frame, 44-lifting card rod, 45-return spring, 46-laser pen, 47-positioning plate, 48-support spring, 51-bent rod, 52-threaded cylinder, 53-clamping plate, 54-limiting round rod, 55-side rod, 56-shaking curved rod, 57-rotating cylinder, 58-transmission rotating rod , 59-magnet block, 510-magnet bar, 61-right-angle bar, 62-right-angle long plate, 63-guide slider, 64-pulling frame, 65-sleeve disc one, 66-sleeve disc two, 67-sleeve disc three, 68-metal iron block, 69-support bending frame, 610-magnetic slide bar, 611-reset spring, 71-connecting rod, 72-bevel gear one, 73-bevel gear two, 74-transmission clamping rod, 75-support circular plate, 76-threaded sleeve rod, 77-extrusion frame, 78-connecting frame. DETAILED DESCRIPTION

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] Example 1 A battery pack shell compression test device, such as Figure 1-11As shown, it includes a base plate 1, two placement grooves are opened on the base plate 1, two support rails 21 are fixedly connected to the base plate 1, the two support rails 21 are symmetrically distributed, the two support rails 21 are slidably connected with electric sliders 22, a connecting long rod 23 is fixedly connected between the two electric sliders 22, hydraulic rods 31 are fixedly connected on both sides of the base plate 1, and an extrusion plate 32 is fixedly connected to the telescopic rod of each hydraulic rod 31, and positioning mechanisms are arranged on both sides of the connecting long rod 23, and 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.

[0029] The positioning mechanism includes two side plates 41, which are provided with a plurality of circular holes. A sliding column 42 is slidably connected to the two side plates 41, and a through hole is provided on the upper portion of the sliding column 42. A limiting frame 43 is fixedly connected to the upper portion of each sliding column 42, and a lifting card rod 44 is slidably connected to each limiting frame 43. The lifting card rod 44 passes through the through hole on the upper portion 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. A laser pen 46 is fixedly connected to one side of each sliding column 42. Positioning plates 47 are placed in the two placement grooves on the base plate 1, and a support spring 48 is connected between the positioning plate 47 and the base plate 1.

[0030] The clamping mechanism includes four bent rods 51, two of the bent rods 51 form a group, and the two groups of bent rods 51 are respectively fixedly connected to the two sliding columns 42, and the lower part of each bent rod 51 is rotatably connected to a threaded cylinder 52, and the two threaded cylinders 52 form a group, and each threaded cylinder 52 is connected to a clamping plate 53 by threading, and a limited round rod 54 is fixedly connected between the two bent rods 51 of each group, and the limited round rod 54 passes through the upper part of the clamping plate 53, and one end of one of the side plates 41 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 of each group, and a transmission rotating rod 58 passes through the two rotating cylinders 57. 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. Two magnet bars 510 are fixedly connected to the inner wall of each threaded cylinder 52. The magnet bars 510 and the magnet blocks 59 have opposite magnetic properties.

[0031] The threads of the two threaded barrels 52 in each group are arranged in opposite directions.

[0032] In the actual extrusion test, the square shell of the battery pack is divided into two parts, both of which are hull structures with one side open. The operator needs to perform an extrusion test on each side of the shell. First, the operator places the shell horizontally on the bottom plate 1, and makes two corners of the square shell against the right angles of the positioning plate 47 and align them. The spacing between the two positioning plates 47 at different positions can make the square shell achieve the positioning effect in both horizontal and vertical states. Then the operator lifts the lifting card rod 44 upwards, and the return spring 45 is stretched, so that the lifting card rod 44 contacts the upper part of the limit frame 43. At this time, the lifting card rod 44 no longer passes through the through hole on the upper part of the sliding column 42 and the side plate 4 1, the operator can lift the lifting card rod 44 upwards, and then move the lifting card rod 44 horizontally to drive the sliding column 42 to move horizontally together, and then the operator can locate whether the sliding column 42 is located above the side of the housing by observing the laser emitted by the laser pen 46. After the operator determines the position, the lifting card rod 44 is lowered, so that the lifting card rod 44 is re-engaged in one of the round holes on the side plate 41, and then the operator starts the electric slide 22, and the electric slide 22 drives the connecting long rod 23 and the side plate 41 to move downward for a distance, and then the side plate 41 moves downward, which drives the sliding column 42 and the clamping plate 53 to move downward for a distance, and the clamping plate 53 moves downward. After moving a certain distance, the two clamping plates 53 of each group are located on both sides of the side wall of the shell, and then the operator rotates the crank rod 56. The rotation of the crank rod 56 will drive the rotating drum 57 to rotate together, and the rotation of the rotating drum 57 will drive the magnet block 59 to rotate together. Since the magnetism of the magnet block 59 and the magnet bar 510 is opposite, the rotation of the magnet block 59 will drive the magnet bar 510 to rotate together through magnetic force, and the rotation of the magnet bar 510 will drive the threaded barrel 52 to rotate. Since the threads on the two threaded barrels 52 in the same group are opposite, the rotation of the threaded barrel 52 will drive the two clamping plates 53 to move horizontally in a direction close to each other through the threads, and then the clamping plates 53 will contact and clamp the side wall of the shell when the horizontal movement is completed. When the force of squeezing the side wall of the shell reaches a certain value, the magnetic force between the magnet block 59 and the magnet bar 510 cannot make the rotating cylinder 57 drive the threaded cylinder 52 to rotate together, and the clamping plate 53 stops moving. When the force of squeezing the side wall of the shell by the clamping plate 53 does not reach a certain value, the shaking crank rod 56 can continue to be rotated to drive the clamping plate 53 to move horizontally, so that the squeezing force of each clamping plate 53 on the side wall of the shell is more consistent, so that it is not easy to generate additional squeezing when the clamping plate 53 clamps the shell, so as not to affect the squeezing 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 squeezing plate 32 to perform squeezing test on one of the two sides of the shell.

[0033] Example 2 On the basis of Example 1, Figure 8-9As shown, it also includes a disc changing mechanism, which 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 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. Two guide sliders 63 form a group, and a pulling frame 64 is fixedly connected between the two guide sliders 63 in each group. The two guide sliders 63 in each group are fixedly connected to each other. A sleeve disc 1 65, a sleeve disc 2 66 and a sleeve disc 3 67 are placed between the right-angle bar 61 and the right-angle long plate 62 on the same side. 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 top of each of the sleeve discs 1 65, the sleeve disc 2 66 and the sleeve disc 3 67. Support bent frames 69 are fixedly connected on both sides of the bottom plate 1. A magnetic slide bar 610 is slidably connected to each of the support bent frames 69. A reset spring 611 is connected between the magnetic slide bar 610 and the support bent frame 69. The metal iron block 68 on the top of the sleeve disc 2 66 is in contact with one side of the magnetic slide bar 610.

[0034] The side surface of the sleeve disc 1 65 is provided with a convex strip, the side surface of the sleeve disc 2 66 is provided with a flat convex block, and the side surface of the sleeve disc 3 67 is provided with a convex column.

[0035] When the telescopic rod of the hydraulic rod 31 is extended and drives the extrusion plate 32 to move horizontally, the extrusion plate 32 will contact the second sleeve plate 66 after moving horizontally for a distance, and then the extrusion plate 32 continues to move horizontally to drive the second sleeve plate 66 to move horizontally together. Since the metal iron block 68 is attracted by the magnetic slide bar 610, the horizontal movement of the second sleeve plate 66 will drive the magnetic slide bar 610 to move horizontally together, the reset spring 611 is stretched, and then the extrusion plate 32 moves horizontally against the second sleeve plate 66 and squeezes the side wall of the shell. When the extrusion is completed, the telescopic rod of the hydraulic rod 31 contracts to drive the extrusion plate 32 to reset, and the reset spring 611 contracts to drive the second sleeve plate 66 to move horizontally together and reset. 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 sleeve disc 1 65, the sleeve disc 2 66 and the sleeve disc 3 67 to move horizontally together, so that the metal iron block 68 on the sleeve disc 2 66 is out of contact with the magnetic slide bar 610, and the metal iron block 68 on the sleeve disc 1 65 is in contact with the magnetic slide bar 610. Similarly, the pulling frame 64 can be pulled to move horizontally, so that the metal iron block 68 on the sleeve disc 3 67 is in contact with the magnetic slide bar 610. Since the side surfaces of the sleeve disc 1 65, the sleeve disc 2 66 and the sleeve disc 3 67 are of different shapes, the extrusion disc 32 can easily switch between different extrusion modes when extruding the side wall of the outer shell, making the extrusion test more comprehensive.

[0036] Example 3 On the basis of Example 2, Figure 10-11 As shown, it also includes a lowering mechanism, which is arranged on the base plate 1 and is used to lower the positioned object. The lowering mechanism includes a connecting rod 71, which is fixedly connected to one end of the side plates 41 away from the side rod 55. 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. The bevel gear 1 72 is connected to one end of the transmission rotating rod 58, and the lower part of the bevel gear 2 73 is fixedly connected to a transmission clamping rod 74. A supporting circular plate 75 is fixedly connected to one side of the base plate 1, and a threaded sleeve rod 76 is rotatably connected to the supporting circular plate 75. A clamping groove is opened on the upper part of the threaded sleeve rod 76, and an extrusion frame 77 is threadedly connected to the threaded sleeve rod 76. The lower part of the extrusion frame 77 passes through the supporting circular plate 75, and 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.

[0037] When the operator starts the electric slider 22 to drive the side plate 41 to move downward a certain distance, the side plate 41 moves downward, which will drive the connecting rod 71 and the transmission rotating rod 58 to move downward together. The connecting rod 71 moves downward, which will drive the transmission clamping rod 74 to move downward a certain distance. After the transmission clamping rod 74 moves downward a certain distance, it will be inserted into the clamping groove on the upper part of the threaded sleeve rod 76. Then, when the operator rotates the shaking crank rod 56 to drive the clamping plate 53 to clamp the side wall of the shell, the rotation of the shaking crank rod 56 will drive the bevel gear 1 72 to rotate, and the bevel gear 1 72 will drive the transmission clamping rod 74 to rotate together through the bevel gear 2 73. The rotation of the transmission clamping rod 74 will drive the threaded sleeve rod 76 to rotate, and the rotation of the threaded sleeve rod 76 will drive the extrusion frame 77 to move downward through the thread. When the clamping plate 53 squeezes and clamps the side wall of the shell After the wall is moved, the crank rod 56 continues to be rotated. After the extrusion frame 77 continues to move downward, it will squeeze the connecting frame 78 and drive the connecting frame 78 to continue to move downward. The connecting frame 78 moves downward for a distance, which will drive the two positioning plates 47 to move downward for a distance. The support spring 48 is compressed. After the two positioning plates 47 move downward for a distance, the upper surfaces of the two positioning plates 47 will be lower than the upper surface of the bottom plate 1, so that the two positioning plates 47 are no longer in contact with the shell. When the shell is squeezed and deformed, the extrusion force on both sides thereof may become uneven, and the positioning plates 47 in contact with the shell may bear part of the extrusion force. By withdrawing the positioning plates 47 downward, the positioning plates 47 will not offset part of the extrusion force when the side of the shell is squeezed, thereby improving the data accuracy of the extrusion test.

[0038] Those skilled in the art should understand that the above embodiments do not limit the present invention in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation shall 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).

Images