Cylindrical lithium battery impact strength testing device

Abstract

The present invention belongs to the technical field of lithium battery detection, and specifically is a device for detecting the impact resistance of a cylindrical lithium battery, comprising an impact testing machine, wherein two lifting guide rails symmetrically arranged in a group and a base fixedly installed at the bottom are fixedly installed inside the impact testing machine, and a top plate is slidably connected to the surface of the lifting guide rails; the present invention starts a servo motor, uses a lead screw to drive a sleeve plate and an impact block to move to a suitable position, and then cuts off the power to the electromagnet in the sleeve plate. At this time, the electromagnet at the bottom of the sleeve plate will no longer adsorb the impact block, so that the impact block falls with the insertion block in the direction of the cylindrical lithium battery, so that different parts of the battery can be subjected to impact detection at one time, which greatly improves the detection efficiency and makes the detection more complete. At the same time, the position of the impact block can be conveniently adjusted for cylindrical lithium batteries of different lengths, so as to achieve the purpose of accurate detection.

Description

Technical Field

[0001] The invention belongs to the technical field of lithium battery detection, in particular to a device for detecting the impact resistance of a cylindrical lithium battery. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrode materials and non-aqueous electrolyte solutions. When lithium batteries are packaged and used, they are usually designed to be cylindrical in shape, and cylindrical lithium batteries have the characteristics of large capacity, long life, and low self-discharge rate.

[0003] Cylindrical lithium batteries need to undergo relevant impact tests before leaving the factory. At this time, a battery heavy object impact tester is needed. By placing the cylindrical battery in the battery heavy object impact tester, and then using the impact force generated by the falling of heavy objects such as iron blocks to test the battery's impact resistance, observe whether the cylindrical lithium battery will catch fire or explode.

[0004] When the battery heavy object impact tester is testing the cylindrical lithium battery, a steel tube will be placed horizontally on the cylindrical lithium battery to ensure stability and guidance during impact, and an iron block will be used to impact the steel tube to perform impact testing on the cylindrical lithium battery. However, this testing method is too simple, resulting in only the points of contact with the steel tube being impacted each time the cylindrical lithium battery is tested. The internal structure of the cylindrical lithium battery is relatively complex and the contents of each position are different, so impact testing on only a single point is not specific and objective enough. If the position of the steel tube is adjusted repeatedly to achieve the purpose of testing the entire cylindrical lithium battery, the position of the steel tube needs to be adjusted continuously, resulting in low testing efficiency.

[0005] To this end, the present invention provides a device for testing the impact strength of a cylindrical lithium battery. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is: the cylindrical lithium battery impact strength detection device described in the present invention comprises an impact testing machine, wherein the interior of the impact testing machine is fixedly installed with lifting guide rails symmetrically arranged in groups of two and a base fixedly installed at the bottom, and the surface of the lifting guide rails is slidably connected to a top plate; a servo motor is fixedly installed on one side of the top plate, and a cavity is provided at the bottom of the top plate, and a screw rod fixedly connected to the output end of the servo motor is rotatably connected inside the cavity, and a sleeve plate is threadedly connected to the surface of the screw rod, and an impact block is adsorbed by an electromagnet at the bottom of the sleeve plate, and a slot is provided at the bottom of the impact block, and an insert block is attached to the inside of the slot by screw locking, and a multi-stage telescopic rod is slidably connected to the interior of the impact testing machine, and one end of the multi-stage telescopic rod is fixedly connected to the impact block; the top of the base is provided with a clamping mechanism adapted to different types of cylindrical batteries, and an ejection mechanism for pushing the battery out after the detection is completed.

[0008] Furthermore, the clamping and supporting mechanism includes a plurality of "C"-shaped clamping seats fixedly mounted on the base, the interior of the clamping seats is symmetrically provided with sliding rods connected by spring sliding connections, a clamping plate is fixedly mounted on one end of the two sliding rods close to each other, the top of the clamping plate is arc-shaped and rotatably connected to a plurality of guide columns, a spring is fixedly mounted inside the base, one end of the spring is fixedly connected to a sliding block slidably connected to the inner wall of the base, a supporting plate is fixedly mounted on the top of the sliding block; a fixing plate is fixedly mounted on the top of the base, and a limiting assembly for fixing the sliding block is fixedly mounted on one side of the fixing plate.

[0009] Furthermore, the limit assembly includes an electric push rod fixedly mounted on a fixed plate, a limit rod fixedly mounted on the output end of the electric push rod, and a plurality of longitudinally arranged limit holes are opened on one side of the slider; the surface of the limit rod is sleeved with a rotating assembly that assists in driving the battery to rotate.

[0010] Furthermore, the rotating assembly includes a connecting plate fixedly mounted on the limiting rod, a side wall of the connecting plate is provided with a bracket, and a roller is fixedly mounted on one end of the bracket.

[0011] Furthermore, the surface of the roller is fixed with a rubber ring.

[0012] Furthermore, the bracket and the connecting plate are rotatably connected via a torsion spring, a slide groove is provided inside the connecting plate, the inner diameter of which gradually increases along the direction of the notch, a rubber block is fixedly installed on one side of the bracket, one end of the block is fixedly connected to a spring, the other end of the spring is fixedly installed in the slide groove, a fixing frame is fixedly installed on the top of the base, and a triangular guide block is fixedly installed on one side of the fixing frame.

[0013] Furthermore, the ejection mechanism includes a rectangular block fixedly mounted on a fixed plate, a U-shaped through slot being provided inside the rectangular block, a push plate passing through a connecting plate being slidably connected to the inside of the through slot via a spring, a plurality of rolling balls being movably connected to the inside of the through slot, a plurality of protrusions being fixedly mounted inside the through slot, a sliding plate being fixedly mounted on one side of the connecting plate and slidably connected to the inside of the through slot, a storage slot being provided on the top of the base, and glass for observing the inside of the storage slot being installed on one side of the base; a protective component for protecting components inside the impact testing machine is arranged inside the storage slot.

[0014] Furthermore, one end of the push plate away from the rectangular block is inclined, and an arc-shaped auxiliary block is fixedly installed on the top of the push plate.

[0015] Furthermore, the protective assembly includes two inclined end covers symmetrically installed on the top of the storage groove through torsion springs, and an arc rod is fixedly installed on the inner wall of the storage groove, and the bottom of the arc rod is in contact with the end cover; a reset assembly for rapid rotation of the end cover is provided on the top of the end cover.

[0016] Furthermore, the reset assembly includes a plurality of magnetic blocks fixedly mounted on an end cover, the bottom of the arc-shaped rod is made of magnetic material, and a wavy sealing block is fixedly mounted on one end of the two end covers close to each other.

[0017] The beneficial effects of the present invention are as follows:

[0018] 1. The present invention inserts the plug into the slot and then locks it to the bottom of the impact block by screws. Since there are several raised hemispheres at the bottom of the plug, it can well replace the steel pipe to impact the columnar lithium battery. At the same time, by replacing the plug, the plug with a cone is inserted into the slot to achieve the test puncture experiment, which is not limited to the impact experiment, and the purpose of multi-functional impact test is achieved without changing the test equipment. The top plate slides up and down in the impact test machine by electric drive. When the top plate drives the plug to slide to the appropriate position, the servo motor is started, and the sleeve plate and the impact block are driven to move to the appropriate position by the screw rod, and the electromagnet in the sleeve plate is powered off. At this time, the electromagnet at the bottom of the sleeve will no longer absorb the impact block, so that the impact block falls with the plug in the direction of the columnar lithium battery. At this time, the multi-stage telescopic rod on the inner wall of the impact test machine plays a role in assisting the impact block to slide, effectively avoiding the deviation of the impact block when it falls, so that it can hit the columnar lithium battery to be tested. Through the above-designed mechanism, the cylindrical lithium battery can be tested more efficiently, so that different parts of the battery can be impact tested at one time, which greatly improves the detection efficiency and makes the detection more complete. At the same time, the position of the impact block can be easily adjusted for cylindrical lithium batteries of different lengths to achieve the purpose of accurate detection.

[0019] 2. In the present invention, when the cylindrical lithium battery has been subjected to an impact test, its bottom has not been impact tested, so it needs to be turned over and tested again. At this time, it is not appropriate to open the cabinet door of the impact tester for manual turning, because the cylindrical lithium battery after an impact needs to be left still to observe whether it will explode and catch fire. Therefore, it is necessary to start the electric push rod again, and use the electric push rod to drive the limit rod, the connecting plate, the bracket and the roller to move together in the direction of the cylindrical lithium battery. Since the cylindrical lithium battery will be deformed after being impacted, the rubber ring on the surface of the roller is used to adapt to the cylindrical lithium battery of different sizes after deformation. At the same time, the rubber ring can increase friction and facilitate the rotation of the cylindrical lithium battery. At this time, the torsion spring on the bracket and the spring in the slide groove both provide resistance. At the same time, because the opening of the slide groove is large, and one end of the block in the slide groove is also large, the block is just stuck in the slide groove, so the slide groove can provide resistance to prevent the block from sliding into the slide groove, and prevent the ring from driving the bracket to rotate in the direction of the connecting plate when it contacts the cylindrical lithium battery, so that the cylindrical lithium battery can be stably driven to rotate. After the ring and roller complete the flipping of the cylindrical lithium battery, they continue to move, so that the inclined ring and roller contact the guide block on the fixed frame. As the ring and roller continue to move, the roller and the bracket are driven to rotate by the triangular guide plate. The rotation force is greater than the resistance of the torsion spring and the spring in the connecting plate, so that the block is temporarily fixed in the turning groove, which makes it convenient for the connecting plate to pass through the cylindrical lithium battery when resetting with the bracket, avoiding the roller and the ring from contacting the cylindrical lithium battery again when resetting, causing it to return to its initial position and making it impossible to perform multi-faceted impact detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the impact testing machine in the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the multi-stage telescopic rod in the present invention when viewed from above;

[0023] Figure 3 It is a schematic diagram of the structure of the top plate in the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the lifting guide rail in the present invention when viewed from above;

[0025] Figure 5 It is a schematic diagram of the structure of the impact block in the present invention;

[0026] Figure 6 It is a schematic diagram of the structure of the clamping seat in the present invention;

[0027] Figure 7 It is a structural schematic diagram of the splint in the present invention;

[0028] Figure 8 The present invention Figure 6 A schematic diagram of the structure at A;

[0029] Fig. 9 It is a schematic diagram of the structure of the end cover in the present invention;

[0030] Fig.10 The present invention Fig. 9 Schematic diagram of the structure at B;

[0031] Fig.11 It is a schematic cross-sectional structural diagram of a rectangular block in the present invention;

[0032] Fig.12 The present invention Fig.11 Schematic diagram of the structure at C;

[0033] Fig.13 It is a partial cross-sectional structural schematic diagram of the connecting plate in the present invention;

[0034] Fig.14 It is a partial cross-sectional structural schematic diagram of the base in the present invention;

[0035] Fig.15 The present invention Fig.14 Schematic diagram of the structure at D.

[0036] In the figure: 10, impact testing machine; 11, base; 12, lifting guide rail; 13, top plate;

[0037] 20. Cavity; 21. Servo motor; 22. Screw; 23. Plate; 24. Impact block; 25. Multi-stage telescopic rod; 26. Insert block; 27. Slot;

[0038] 30. Clamping seat; 31. Clamping plate; 32. Sliding rod; 33. Guide column; 34. Sliding block; 35. Support plate; 36. Limiting hole; 37. Fixing plate; 38. Electric push rod; 39. Limiting rod;

[0039] 301, connecting plate; 302, bracket; 303, roller; 304, collar; 305, fixing frame; 306, guide block; 307, slide groove; 308, clamping block;

[0040] 40. rectangular block; 41. through slot; 42. rolling ball; 43. sliding plate; 44. push plate; 45. auxiliary block; 46. protrusion; 47. storage slot; 48. glass;

[0041] 401, end cover; 402, arc rod; 403, magnetic block; 404, sealing block. DETAILED DESCRIPTION

[0042] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0043] like Figures 1 to 15 As shown, the impact strength testing device for a cylindrical lithium battery described in an embodiment of the present invention comprises an impact testing machine 10, wherein lifting guide rails 12 symmetrically arranged in groups of two and a base 11 fixedly installed at the bottom are fixedly installed inside the impact testing machine 10, a top plate 13 is slidably connected to the surface of the lifting guide rails 12, a servo motor 21 is fixedly installed on one side of the top plate 13, a cavity 20 is provided at the bottom of the top plate 13, a screw rod 22 fixedly connected to the output end of the servo motor 21 is rotatably connected inside the cavity 20, a sleeve plate 23 is threadedly connected to the surface of the screw rod 22, an impact block 24 is adsorbed at the bottom of the sleeve plate 23 through an electromagnet, a slot 27 is provided at the bottom of the impact block 24, an insert block 26 is screwed inside the slot 27, a multi-stage telescopic rod 25 (composed of a plurality of slidably connected cylinders) is slidably connected inside the impact testing machine 10, and one end of the multi-stage telescopic rod 25 is fixedly connected to the impact block 24.

[0044] During operation, the plug block 26 is inserted into the slot 27 and then screwed to the bottom of the impact block 24. Since there are several hemispheres with protrusions 46 at the bottom of the plug block 26, it can well replace the steel tube to impact the cylindrical lithium battery. At the same time, the plug block 26 with a cone can be replaced by inserting it into the slot 27 to achieve the puncture test, which is not limited to the impact test, and the purpose of multi-functional impact test is achieved without changing the test equipment. The top plate 13 slides up and down in the impact tester 10 by means of electric drive. When the top plate 13 drives the plug block 26 to slide to the appropriate position, the servo motor 21 is started, and the screw rod 22 is used to drive the sleeve plate 23 and the impact block 24 to move to the appropriate position, and then the electromagnet in the sleeve plate 23 is powered off. At this time, the electromagnet at the bottom of the sleeve plate 23 will no longer absorb the impact block 24, so that the impact block 24 and the plug block 26 fall in the direction of the columnar lithium battery. At this time, the multi-stage telescopic rod 25 on the inner wall of the impact tester 10 plays a role in assisting the impact block 24 to slide, effectively avoiding the deviation of the impact block 24 when it falls, so that it can hit the columnar lithium battery to be tested. Through the above-mentioned designed mechanism, the columnar lithium battery can be tested more efficiently, so that different parts of it can be subjected to impact testing at one time, which greatly improves the detection efficiency and makes the detection more complete. At the same time, the position of the impact block 24 can be conveniently adjusted for columnar lithium batteries of different lengths to achieve the purpose of accurate detection.

[0045] In one embodiment of the present invention, a clamping mechanism adapted to different types of cylindrical batteries is provided on the top of the base 11, and the clamping mechanism includes a plurality of "C"-shaped clamping seats 30 fixedly mounted on the base 11, and the interior of the clamping seats 30 is symmetrically provided with sliding rods 32 connected by spring sliding. A clamping plate 31 is fixedly mounted at one end of the two sliding rods 32 close to each other, and the top of the clamping plate 31 is arc-shaped and rotatably connected to a plurality of guide columns 33. A spring is fixedly mounted inside the base 11, and one end of the spring is fixedly connected to a slider 34 slidably connected to the inner wall of the base 11, and a support plate 35 is fixedly mounted on the top of the slider 34.

[0046] Specifically, a fixing plate 37 is fixedly installed on the top of the base 11, and a limiting assembly for fixing the slider 34 is fixedly installed on one side of the fixing plate 37. The limiting assembly includes an electric push rod 38 fixedly installed on the fixing plate 37, and a limiting rod 39 is fixedly installed on the output end of the electric push rod 38. A plurality of longitudinally arranged limiting holes 36 are opened on one side of the slider 34.

[0047] During operation, first place the cylindrical lithium battery into the clamping seat 30 so that the cylindrical lithium battery contacts the curved surface on the top of the clamping plate 31 and the guide column 33, and then use the curved clamping plate 31 and the rotating guide column 33 for adaptation and guidance, and then open the two clamping plates 31 close to each other, and the two clamping plates 31 move away from each other through the sliding rod 32, so that the cylindrical lithium battery can enter and be clamped and fixed, so as to adapt to cylindrical lithium batteries of different sizes. At the same time, the cylindrical lithium battery is on the support plate 35. Since the cylindrical lithium battery will squeeze the support plate 35 and the slider 34 when placed, the slider 34 will squeeze the spring in the base 11 to adapt to the cylindrical lithium battery, so that the limiting hole 36 on the slider 34 and the limiting rod 39 on the electric push rod 38 are in the same straight line. Starting the electric push rod 38 drives the limiting rod 39 to enter the limiting hole 36 for fixing, thereby fixing the slider 34 and the support plate 35, so that when the impact block 24 hits the cylindrical lithium battery, the cylindrical lithium battery will not move downward due to the huge impact force, but hit the clamping seat 30, and the clamping seat 30 and the clamping plate 31 are both below the center line of the cylindrical lithium battery, so when the impact block 24 impacts the cylindrical lithium battery, the clamping seat 30 will not be accidentally injured. The above-mentioned structure designed can well protect the battery and perform a limiting effect while adapting to batteries of different sizes to prevent deviation after impact.

[0048] The surface of the limit rod 39 is sleeved with a rotating assembly that assists in pushing the battery to rotate, and the rotating assembly includes a connecting plate 301 fixedly sleeved on the limit rod 39, and a bracket 302 is provided on the side wall of the connecting plate 301. A roller 303 is fixedly installed at one end of the bracket 302, and a rubber ring 304 is fixedly sleeved on the surface of the roller 303. The bracket 302 and the connecting plate 301 are rotatably connected by a torsion spring, and a slide groove 307 whose inner diameter gradually increases along the direction of the notch is provided inside the connecting plate 301. A rubber block 308 is fixedly installed on one side of the bracket 302, and one end of the block 308 is fixedly connected to a spring, and the other end of the spring is fixedly installed in the slide groove 307. A fixing frame 305 is fixedly installed on the top of the base 11, and a triangular guide block 306 is fixedly installed on one side of the fixing frame 305.

[0049] During operation, after the cylindrical lithium battery has been subjected to an impact test, its bottom has not been impact tested yet, so it needs to be turned over for another test. At this time, it is not appropriate to open the cabinet door of the impact testing machine 10 for manual turning, because the cylindrical lithium battery after an impact needs to be left still to observe whether it will explode or catch fire. Therefore, it is necessary to start the electric push rod 38 again, and use the electric push rod 38 to drive the limit rod 39, the connecting plate 301, the bracket 302 and the roller 303 to move in the direction of the cylindrical lithium battery. Since the cylindrical lithium battery will be deformed after being impacted, the rubber ring 304 on the surface of the roller 303 is used to adapt to the cylindrical lithium batteries of different sizes after deformation. At the same time, the rubber ring 304 can increase friction and facilitate the rotation of the cylindrical lithium battery. At this time, the torsion spring on the bracket 302 and the spring in the slide groove 307 both provide resistance. At the same time, since the opening of the slide groove 307 is large, and one end of the block 308 in the slide groove 307 is also large, the block 308 is just stuck in the slide groove 307, so the slide groove 307 can provide resistance to prevent the block 308 from sliding into the slide groove 307, and prevent the ring 304 from driving the bracket 302 to rotate in the direction of the connecting plate 301 when contacting the cylindrical lithium battery, thereby stably pushing the cylindrical lithium battery to rotate. When the ring 304 and the roller 303 complete the flipping of the cylindrical lithium battery, they continue to move, so that the inclined ring 304 and the roller 303 contact the guide block 306 on the fixed frame 305. As the ring 304 and the roller 303 continue to move, the roller 303 and the bracket 302 are driven to rotate by the triangular guide plate. The rotation force is greater than the resistance of the torsion spring and the spring in the connecting plate 301, so that the block 308 is temporarily clamped and fixed in the turning groove 307, which makes it convenient for the connecting plate 301 to pass through the cylindrical lithium battery when resetting with the bracket 302, and avoids the roller 303 and the ring 304 from contacting the cylindrical lithium battery again when resetting, causing it to return to its initial position and unable to perform multi-faceted impact detection.

[0050] In one embodiment of the present invention, an ejection mechanism for pushing out the tested batteries is provided on the fixed plate 37, and the ejection mechanism includes a rectangular block 40 fixedly mounted on the fixed plate 37, a U-shaped through groove 41 is provided inside the rectangular block 40, a push plate 44 passing through the connecting plate 301 is slidably connected to the inside of the through groove 41 by a spring, a plurality of rolling balls 42 are movably connected to the inside of the through groove 41, a plurality of protrusions 46 are fixedly installed inside the through groove 41, a sliding plate 43 is fixedly installed on one side of the connecting plate 301 and slidably connected to the inside of the through groove 41, a storage groove 47 is provided on the top of the base 11, a glass 48 for observing the inside of the storage groove 47 is installed on one side of the base 11, the end of the push plate 44 away from the rectangular block 40 is inclined, and an arc-shaped auxiliary block 45 is fixedly installed on the top of the push plate 44.

[0051] During operation, after the cylindrical lithium battery completes the impact detection, the electric push rod 38 is started to make it leave the limiting hole 36 of the slider 34 with the limiting rod 39. At this time, the sliding plate 43 on the connecting plate 301 is in the through groove 41 of the rectangular block 40, so that the electric push rod 38 drives the sliding plate 43 to continue to move into the through groove 41, and the sliding plate 43 will push the ball 42 to continue to move, so that the ball 42 continues to move in the direction of the push plate 44, and then push the push plate 44 to move away from the through groove 41, so that the inclined surface of the push plate 44 contacts the cylindrical lithium battery, and the cylindrical lithium battery is lifted up. At the same time, the arc-shaped auxiliary block 45 cooperates with the push plate 44 to rotate and lift the cylindrical lithium battery, and at the same time, it can also prevent the cylindrical lithium battery from rolling in the direction of the connecting plate 301, so that it can only rotate in the direction of the storage groove 47 and fall into it after being pushed, so as to store the cylindrical lithium battery. At the same time, the situation of the cylindrical lithium battery in the storage groove 47 can be observed in real time through the glass 48.

[0052] Specifically, the protection component includes two inclined end covers 401 which are symmetrically installed on the top of the storage groove 47 through torsion springs, an arc rod 402 is fixedly installed on the inner wall of the storage groove 47, the bottom of the arc rod 402 is in contact with the end cover 401, and a reset component for rapid rotation of the end cover 401 is provided on the top of the end cover 401. The reset component includes a plurality of magnetic blocks 403 fixedly installed on one end cover 401, the bottom of the arc rod 402 is made of magnetic material, and a wavy sealing block 404 is fixedly installed at one end of the two end covers 401 close to each other.

[0053] During operation, when the cylindrical lithium battery is rotated and lifted by the push plate 44 and falls into the storage groove 47, the two end covers 401 at the top of the storage groove 47 will be squeezed open. After the cylindrical lithium battery completely falls into the storage groove 47, the two end covers 401 will be reset under the action of the torsion spring, and one of the end covers 401 will be quickly reset under the adsorption of the magnetic block 403 and the arc rod 402, so that the two end covers 401 are reset in sequence, so that the wavy sealing blocks 404 on the two end covers 401 can overlap, and achieve a better sealing effect. When the cylindrical lithium battery in the storage groove 47 explodes and catches fire, the pressure relief channel on the base 11 will start to relieve pressure, and the arc rod 402 will resist the end cover 401 to prevent it from rotating and opening, causing the fire to spread out of the storage groove 47 and damage the external components.

[0054] Working principle: first put the cylindrical lithium battery into the clamping seat 30, so that the cylindrical lithium battery contacts the curved surface on the top of the clamping plate 31 and the guide column 33, and use the curved clamping plate 31 and the rotating guide column 33 for adaptation and guidance, and then open the two clamping plates 31 close to each other, and the two clamping plates 31 move away from each other through the sliding rod 32, so that the cylindrical lithium battery can enter and be clamped and fixed. At the same time, the cylindrical lithium battery is on the support plate 35. Since the cylindrical lithium battery will squeeze the support plate 35 and the slider 34 when placed, the slider 34 will squeeze the spring in the base 11 to adapt to the cylindrical lithium battery, so that the limit hole 36 on the slider 34 and the limit rod 39 on the electric push rod 38 are in the same straight line, and the electric push rod 38 is started to drive the limit rod 39 to enter the limit hole 36 and be fixed, thereby fixing the slider 34 and the support plate 35. By inserting the plug 26 into the slot 27 and then locking it to the bottom of the impact block 24 with screws, since there are several hemispheres with protrusions 46 at the bottom of the plug 26, it can well replace the steel pipe to impact the cylindrical lithium battery. At the same time, by replacing the plug 26, the plug 26 with a cone is inserted into the slot 27 to achieve the test puncture experiment. The top plate 13 slides up and down in the impact tester 10 by electric drive. When the top plate 13 drives the plug 26 to slide to the appropriate position, the servo motor 21 is started, and the sleeve plate 23 and the impact block 24 are driven to move to the appropriate position by the screw rod 22, and the electromagnet in the sleeve plate 23 is turned off. At this time, the electromagnet at the bottom of the sleeve plate 23 will no longer absorb the impact block 24, so that the impact block 24 falls with the plug 26 in the direction of the cylindrical lithium battery. At this time, the multi-stage telescopic rod 25 on the inner wall of the impact tester 10 plays a role in assisting the impact block 24 to slide, so that it can hit the cylindrical lithium battery to be tested.

[0055] The electric push rod 38 is started again, and the electric push rod 38 is used to drive the limit rod 39, the connecting plate 301, the bracket 302 and the roller 303 to move in the direction of the cylindrical lithium battery. The rubber ring 304 on the surface of the roller 303 is used to adapt to the cylindrical lithium batteries of different sizes after deformation. At the same time, the rubber ring 304 can increase friction and facilitate the rotation of the cylindrical lithium battery. At this time, the torsion spring on the bracket 302 and the spring in the slide groove 307 both provide resistance. At the same time, since the opening of the slide groove 307 is large, and one end of the block 308 in the slide groove 307 is also large, the block 308 is just stuck in the slide groove 307, so the slide groove 307 can provide resistance to prevent the block 308 from sliding into the slide groove 307, and prevent the ring 304 from driving the bracket 302 to rotate in the direction of the connecting plate 301 when contacting the cylindrical lithium battery, thereby stably pushing the cylindrical lithium battery to rotate. When the ring 304 and the roller 303 complete the flipping of the cylindrical lithium battery, they continue to move, so that the inclined ring 304 and the roller 303 contact the guide block 306 on the fixed frame 305. As the ring 304 and the roller 303 continue to move, the roller 303 and the bracket 302 are driven to rotate by the triangular guide plate. The rotation force is greater than the resistance of the torsion spring and the spring in the connecting plate 301, so that the block 308 is temporarily clamped and fixed in the turning groove 307, which makes it convenient for the connecting plate 301 to pass through the cylindrical lithium battery when resetting with the bracket 302, and avoids the roller 303 and the ring 304 from contacting the cylindrical lithium battery again when resetting, causing it to return to its initial position and unable to perform multi-faceted impact detection.

[0056] After the cylindrical lithium battery completes the collision detection, the electric push rod 38 is started to make it leave the limiting hole 36 of the slider 34 with the limiting rod 39. At this time, the sliding plate 43 on the connecting plate 301 is in the through groove 41 of the rectangular block 40, so that the electric push rod 38 drives the sliding plate 43 to continue to move into the through groove 41. The sliding plate 43 will push the rolling ball 42 to continue to move, so that the rolling ball 42 continuously moves in the direction of the push plate 44, and then push the push plate 44 to move away from the through groove 41, so that the inclined surface of the push plate 44 contacts the cylindrical lithium battery, and the cylindrical lithium battery is lifted up. At the same time, the arc-shaped auxiliary block 45 cooperates with the push plate 44 to rotate and lift the cylindrical lithium battery, and at the same time, it can also prevent the cylindrical lithium battery from rolling in the direction of the connecting plate 301, so that it is pushed After that, it can only rotate in the direction of the storage groove 47 and fall in, and will squeeze open the two end covers 401 on the top of the storage groove 47. After the cylindrical lithium battery completely falls into the storage groove 47, the two end covers 401 will be reset under the action of the torsion spring, and one of the end covers 401 will be quickly reset under the adsorption of the magnetic block 403 and the arc rod 402, so that the two end covers 401 are reset in sequence, so that the wavy sealing blocks 404 on the two end covers 401 can overlap, and achieve a better sealing effect. When the cylindrical lithium battery in the storage groove 47 explodes and catches fire, the pressure relief channel on the base 11 will start to relieve pressure, and the arc rod 402 will resist the end cover 401 to prevent it from rotating open and causing the fire to spread out of the storage groove 47.

[0057] The above-mentioned front, back, left, right, top and bottom are all based on the figures in the specification. Figure 1 As a benchmark, according to the person's observation perspective, the side of the device facing the observer is defined as the front, the left side of the observer is defined as the left, and so on.

[0058] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention.

[0059] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A cylindrical lithium battery impact strength testing device, characterized in that: The impact testing machine (10) comprises lifting guide rails (12) symmetrically arranged in pairs and a base (11) fixedly installed at the bottom, wherein the lifting guide rails (12) are slidably connected to the surface of the lifting guide rails (12). A servo motor (21) is fixedly mounted on one side of the top plate (13); a cavity (20) is provided at the bottom of the top plate (13); a screw rod (22) fixedly connected to an output end of the servo motor (21) is rotatably connected inside the cavity (20); a sleeve plate (23) is threadedly connected to the surface of the screw rod (22); an impact block (24) is adsorbed on the bottom of the sleeve plate (23) via an electromagnet; a slot (27) is provided at the bottom of the impact block (24); an insert block (26) is screwed onto the inside of the slot (27); a multi-stage telescopic rod (25) is slidably connected inside the impact testing machine (10); one end of the multi-stage telescopic rod (25) is fixedly connected to the impact block (24); The top of the base (11) is provided with a clamping mechanism adapted to cylindrical batteries of different models, and an ejection mechanism for ejecting the battery after detection; The clamping and supporting mechanism comprises a plurality of "C"-shaped clamping seats (30) fixedly mounted on the base (11); sliding rods (32) slidably connected via springs are symmetrically arranged inside the clamping seats (30); a clamping plate (31) is fixedly mounted on one end of two sliding rods (32) close to each other; the top of the clamping plate (31) is arc-shaped and rotatably connected to a plurality of guide columns (33); a spring is fixedly mounted inside the base (11); one end of the spring is fixedly connected to a sliding block (34) slidably connected to the inner wall of the base (11); a supporting plate (35) is fixedly mounted on the top of the sliding block (34); A fixing plate (37) is fixedly mounted on the top of the base (11), and a limiting component for fixing the slider (34) is fixedly mounted on one side of the fixing plate (37); The limiting assembly comprises an electric push rod (38) fixedly mounted on a fixing plate (37); a limiting rod (39) is fixedly mounted on the output end of the electric push rod (38); a plurality of longitudinally arranged limiting holes (36) are formed on one side of the slider (34); and a rotating assembly for assisting in driving the battery to rotate is sleeved on the surface of the limiting rod (39); The rotating assembly comprises a connecting plate (301) fixedly sleeved on a limiting rod (39); a bracket (302) is provided on a side wall of the connecting plate (301); a roller (303) is fixedly mounted on one end of the bracket (302); and a ring (304) made of rubber is fixedly sleeved on the surface of the roller (303); The bracket (302) and the connecting plate (301) are rotatably connected via a torsion spring; a slide groove (307) whose inner diameter gradually increases along the direction of the notch is provided inside the connecting plate (301); a rubber block (308) is fixedly mounted on one side of the bracket (302); one end of the block (308) is fixedly connected to a spring; the other end of the spring is fixedly mounted in the slide groove (307); a fixing frame (305) is fixedly mounted on the top of the base (11); a triangular guide block (306) is fixedly mounted on one side of the fixing frame (305); The ejection mechanism comprises a rectangular block (40) fixedly mounted on a fixed plate (37); a U-shaped through slot (41) is provided inside the rectangular block (40); a push plate (44) passing through a connecting plate (301) is slidably connected inside the through slot (41) via a spring; a plurality of rolling balls (42) are movably connected inside the through slot (41); a plurality of protrusions (46) are fixedly mounted inside the through slot (41); a sliding plate (43) is fixedly mounted on one side of the connecting plate (301) and slidably connected to the inside of the through slot (41); a receiving slot (47) is provided on the top of the base (11); a glass (48) for observing the inside of the receiving slot (47) is installed on one side of the base (11); and a protective component for protecting parts inside the impact testing machine (10) is arranged inside the receiving slot (47).

2. The cylindrical lithium battery impact strength testing device according to claim 1, characterized in that: One end of the push plate (44) away from the rectangular block (40) is inclined, and an arc-shaped auxiliary block (45) is fixedly mounted on the top of the push plate (44).

3. The cylindrical lithium battery impact strength testing device according to claim 2, characterized in that: The protection assembly comprises two inclined end covers (401) symmetrically mounted on the top of the storage groove (47) via torsion springs, an arc-shaped rod (402) being fixedly mounted on the inner wall of the storage groove (47), and the bottom of the arc-shaped rod (402) is in contact with the end cover (401); A resetting assembly for rapid rotation of the end cover (401) is provided on the top of the end cover (401).

4. The cylindrical lithium battery impact strength testing device according to claim 3, characterized in that: The reset assembly comprises a plurality of magnetic blocks (403) fixedly mounted on an end cover (401), the bottom of the arc-shaped rod (402) is made of magnetic material, and a wavy sealing block (404) is fixedly mounted on one end of the two end covers (401) close to each other.

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