High-speed impact test device for lithium battery safety test

Abstract

The high-speed impact test device for the lithium battery safety test comprises a bottom plate, a base, an upper top plate, a hammer head and a buffer unit, four guide rods corresponding to four corners of the base are arranged on the bottom plate, and the upper ends of the guide rods are arranged in matching holes in the top plate in a penetrating mode. The base comprises a top plate and a holding ring, and the holding ring for limiting the downward moving distance of the top plate is arranged on the base in a sleeving manner, so that the centering property of the hammer head in the high-speed impact process can be ensured, deviation can be avoided, and the maximum invasion amount when the hammer head impacts the lithium battery to be detected can be limited; the buffer unit comprises an optical switch for detecting the position of a top plate and / or the position of the hammerhead and hydraulic cylinders vertically arranged on the left side and the right side of the base, when the optical switch is triggered, hydraulic rods of the hydraulic cylinders are jacked, the top plate can be lifted upwards, the rebounded hammerhead is prevented from falling down again, and the impact force of the hammerhead on the lithium battery to be detected can be detected. And the lithium battery to be tested is prevented from being damaged by secondary impact.

Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, specifically to a high-speed impact testing device for lithium battery safety testing. Background Technology

[0002] High-speed impact testing is one of the key tests to ensure the safety of lithium batteries during transportation. By simulating extreme physical impacts, it evaluates the structural robustness and electrical performance stability of the battery, ensuring that no dangerous situations such as leakage, fire or explosion will occur when subjected to accidental impact or drop, thereby protecting the lives and property of transportation personnel.

[0003] Traditional high-speed impact tests for lithium batteries mostly use a drop hammer test bench, where the lithium battery sample is impacted by the free fall of the hammer after it is released. This method has at least the following problems:

[0004] 1. The hammer head is prone to deviation during the falling process, causing the impact area to become a non-target area, which affects the test results.

[0005] 2. The free fall of the hammer head cannot guarantee the preset penetration depth, and it is impossible to determine the damage to the lithium battery sample caused by the penetration depth.

[0006] 3. The hammer head is prone to rebound after impact, which can cause secondary damage to the lithium battery sample. It is impossible to determine whether the sample has been subjected to a single impact or multiple impacts. Utility Model Content

[0007] The purpose of this invention is to overcome one or more shortcomings of the prior art and provide a high-speed impact testing device for lithium battery safety testing.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is a high-speed impact testing device for lithium battery safety testing, comprising:

[0009] Base plate;

[0010] A base is provided on the base plate;

[0011] A top plate that can be moved up and down above the base plate;

[0012] A hammer head fixed to the lower surface of the top plate and protruding downwards;

[0013] Buffer unit;

[0014] The base plate is provided with four guide rods extending vertically upwards and arranged corresponding to the four corners of the base. The upper end of the guide rod passes through the mating hole in the top plate, and a clamping ring is sleeved on the guide rod to limit the downward movement distance of the top plate.

[0015] The base includes a lower support plate, an upper support plate parallel to the lower support plate, and a mechanical sensor disposed between the upper support plate and the lower support plate. The lower support plate is disposed on the base plate, the upper support plate is used to place the lithium battery to be tested, and the mechanical sensor is used to detect the impact force when the hammer impacts the lithium battery to be tested.

[0016] The buffer unit includes an optical switch for detecting the position of the top plate and / or the hammer head, and hydraulic cylinders located on the left and right sides of the base. The hydraulic cylinders are vertically arranged, and when the optical switch is triggered, the hydraulic rod of the hydraulic cylinder rises to lift the top plate upward, preventing the hammer head from falling again after rebounding.

[0017] Preferably, a linear bearing is embedded in the mating hole, and the linear bearing is slidably sleeved on the upper end of the guide rod.

[0018] Preferably, the clamping ring includes an open ring with an opening and a bolt for locking the open ring. The open ring is sleeved on the guide rod, the outer diameter of the open ring is larger than the diameter of the through hole, and the opening width of the open ring is 5-10 mm.

[0019] More preferably, the middle part of the bolt extends across the opening, the bolt passes through one end of the opening ring and is threaded to its other end, when the bolt is tightened, the relative position of the opening ring and the guide rod remains locked, and when the bolt is loosened, the opening ring can move up and down along the guide rod.

[0020] Preferably, the mechanical sensor includes an upper cone, a lower cone, a rectangular block, and a strain gauge. The upper cone and the lower cone are rigid bodies, and the upper cone and the lower cone abut against the upper and lower surfaces of the rectangular block. The rectangular block is a flexible body, and the strain gauge is disposed on the side wall of the rectangular block for detecting the impact force generated when the hammer impacts the lithium battery under test.

[0021] More preferably, the upper cone is a cone with a larger upper part and a smaller lower part, with the upper and lower end faces of the upper cone respectively abutting against the lower surface of the upper support plate and the upper surface of the rectangular block; the lower cone is a cone with a smaller upper part and a larger lower part, with the upper and lower end faces of the lower cone respectively abutting against the lower surface of the rectangular block and the upper surface of the lower support plate.

[0022] More preferably, the upper cone and the lower cone are coaxially arranged, the upper end of the upper cone is provided with an outwardly horizontally extending upper skirt, the upper skirt is fixedly connected to the upper support plate, and the lower end of the lower cone is provided with an outwardly horizontally extending lower skirt, the lower skirt is fixedly connected to the lower support plate.

[0023] More preferably, there are at least two strain gauges, which are respectively disposed on two mutually perpendicular sidewalls of the rectangular block.

[0024] Preferably, the buffer unit further includes a support frame for supporting the optical switch. The support frame is located on the right side of the base plate. The support frame includes a main support rod extending vertically and multiple auxiliary support rods evenly distributed around the main support rod. The auxiliary support rods are inclined, with their upper ends connected to the middle of the main support rod and their lower ends flush with the bottom of the main support rod. The optical switch is located at the top of the main support rod.

[0025] Preferably, the upper end of the hydraulic rod is provided with a rebound support head, which is a rubber head.

[0026] Preferably, the hammerhead extends in the front-to-back direction, and the length of the hammerhead in the front-to-back direction is equal to the width of the top plate in the front-to-back direction.

[0027] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0028] 1. By setting guide rods at the four corners of the base for guidance, the centering of the hammer head can be ensured and deviation can be avoided during high-speed impact.

[0029] 2. By fitting a clamping ring on the guide rod to limit the downward movement distance of the top plate, the maximum intrusion amount when the hammer impacts the lithium battery under test can be limited.

[0030] 3. By setting up an optical switch and a hydraulic cylinder, when the optical switch is triggered by the top plate and / or the hammer, the hydraulic rod of the hydraulic cylinder is lifted, which can lift the top plate upwards and prevent the hammer from falling again after rebounding, thus preventing secondary impact from damaging the lithium battery under test.

[0031] 4. This high-speed impact testing device has a simple structure, low cost, and low environmental requirements. Attached Figure Description

[0032] Figure 1 This is a perspective view of a preferred embodiment of the present invention.

[0033] Figure 2 yes Figure 1 Front view diagram.

[0034] Figure 3 yes Figure 1 A magnified 3D diagram of the central base.

[0035] Figure 4 yes Figure 1 A magnified 3D diagram of the hammerhead.

[0036] The components are as follows: 1. Lithium battery under test; 10. Base plate; 11. Guide rod; 12. Clamping ring; 121. Opening ring; 122. Bolt; 20. Base; 21. Lower support plate; 22. Upper support plate; 23. Mechanical sensor; 231. Upper top cone; 232. Lower top cone; 233. Rectangular block; 234. Strain gauge; 235. Upper skirt; 236. Lower skirt; 30. Top plate; 31. Mating hole; 32. Linear bearing; 40. Hammer head; 51. Optical switch; 52. Hydraulic cylinder; 521. Hydraulic rod; 522. Rebound support head; 53. Support frame; 531. Main support rod; 532. Auxiliary support rod. Detailed Implementation

[0037] like Figures 1 to 4 As shown, the high-speed impact testing device for lithium battery safety testing provided by this utility model includes: a base plate 10, a base 20, a top plate 30, a hammer head 40, and a buffer unit. The base plate 10 extends horizontally, the base 20 is mounted on the base plate 10, and the top plate 30 is movably mounted above the base plate 10. The hammer head 40 is detachably fixed to the lower surface of the top plate 30. Specifically, the base plate 10 has four guide rods extending vertically upwards, corresponding to the four corners of the base 20. The upper ends of the guide rods 11 pass through mating holes 31 on the top plate 30, and clamping rings 12 are fitted onto the guide rods 11 to limit the downward movement distance of the top plate 30. The base 20 includes a lower support plate 21, an upper support plate 22 parallel to the lower support plate 21, and a force sensor 23 between the upper support plate 22 and the lower support plate 21. The lower support plate 21 is mounted on the base plate 10, the upper support plate 22 is used to place the lithium battery 1 to be tested, and the force sensor 23 is used to detect the impact force when the hammer 40 impacts the lithium battery 1 to be tested. The buffer unit includes an optical switch 51 for detecting the position of the top plate 30 and / or the hammer 40, and hydraulic cylinders 52 located on the left and right sides of the base 20. The hydraulic cylinders 52 are vertically arranged. When the optical switch 51 is triggered, the hydraulic rod 521 of the hydraulic cylinder 52 is lifted to lift the top plate 30 upward, preventing the hammer 40 from falling again after rebounding.

[0038] The advantages of this setup are: it ensures the centering of the hammer during high-speed impact to prevent deviation, limits the maximum intrusion amount when the hammer impacts the lithium battery under test, detects the impact force when the hammer impacts the lithium battery under test, and prevents the hammer from falling again after rebounding, thus preventing secondary impact damage to the lithium battery under test. In addition, the high-speed impact test device has a simple structure, low cost, and low environmental requirements.

[0039] To facilitate guidance and reduce energy loss, in this embodiment, a linear bearing 32 is embedded in the mating hole 31 of the top plate 30, and the linear bearing 32 is slidably sleeved on the upper end of the guide rod 11.

[0040] To facilitate position adjustment, in this embodiment, the clamping ring 12 includes an open ring 121 with an opening and a bolt 122 for locking the open ring 121. The open ring 121 is sleeved on the guide rod 11. The outer diameter of the open ring 121 is larger than the diameter of the through hole 31 on the top plate 30. The opening width of the open ring 121 is 5-10mm. The middle part of the bolt 122 is horizontally across the opening of the open ring 121. The bolt 122 passes through one end of the open ring 121 and is threaded to its other end. When the bolt 122 is locked, the relative position of the open ring 121 and the guide rod 11 remains locked. When the bolt 122 is loosened, the open ring 121 can move up and down along the guide rod 11.

[0041] In this embodiment, the mechanical sensor 23 includes an upper cone 231, a lower cone 232, a rectangular block 233, and a strain gauge 234. The upper cone 231 and lower cone 232 are rigid bodies, and they abut against the upper and lower surfaces of the rectangular block 233. The rectangular block 233 is a flexible body. The strain gauge 234 is disposed on the side wall of the rectangular block 233 and is used to detect the impact force generated when the hammer 40 impacts the lithium battery 1 under test. Further, the upper cone 231 is a cone shape with a larger upper part and a smaller lower part, and the upper and lower end faces of the upper cone 231 abut against the lower surface of the upper support plate 22 and the upper surface of the rectangular block 233, respectively. Cone 232 is a cone-shaped structure with a smaller top and a larger bottom, and the upper and lower end faces of the lower cone 232 abut against the lower surface of the rectangular block 233 and the upper surface of the lower support plate 21, respectively. The upper cone 231 and the lower cone 232 are coaxially arranged. The upper end of the upper cone 231 is provided with an outwardly horizontally extending upper skirt 235, which is fixedly connected to the upper support plate 22 by bolts. The lower end of the lower cone 232 is provided with an outwardly horizontally extending lower skirt 236, which is fixedly connected to the lower support plate 21 by bolts. There are two strain gauges 234, which are respectively arranged on two mutually perpendicular side walls of the rectangular block 233.

[0042] In this embodiment, the buffer unit further includes a support frame 53 for supporting the optical switch 51. The support frame 53 is located on the right side of the base plate 10. The support frame 53 includes a main support rod 531 extending in a vertical direction and multiple auxiliary support rods 532 evenly distributed around the main support rod 531. The auxiliary support rods 532 are inclined, with their upper ends connected to the middle of the main support rod 531 and their lower ends flush with the bottom of the main support rod 531. The optical switch 51 is located at the top of the main support rod 531. Furthermore, the upper end of the hydraulic rod 521 is provided with a spring-loaded support head 522, which is a rubber head.

[0043] The shape of the hammer head 50 can be selected according to the requirements of the lithium battery 1 to be tested. In this embodiment, the hammer head 50 extends in the front-back direction and is in the shape of a downward convex arc. Its upper end is provided with a flange extending to the left and right sides. The length of the hammer head 50 in the front-back direction is equal to the width of the top plate 30 in the front-back direction.

[0044] To facilitate the operation of the buffer unit, in this embodiment, when the strain gauge 234 sends a detection signal, the optical switch 51 is turned on. When the hammer head 40 rebounds to the height that triggers the optical switch 51, the optical switch 51 is triggered, and the hydraulic rod 521 of the hydraulic cylinder 52 is lifted to lift the top plate 30 upward, thus avoiding secondary impact of the hammer head 40.

[0045] The above embodiments are only for illustrating the technical concept and features of this utility model. Their purpose is to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be used to limit the protection scope of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-speed impact testing apparatus for lithium battery safety testing, comprising: Base plate; The base is set on the base plate; A top plate that can be moved up and down above the base plate; A hammer head fixed to the lower surface of the top plate and protruding downwards; Buffer unit; Its features are: The base plate is provided with four guide rods extending vertically upwards, corresponding to the four corners of the base. The upper end of each guide rod passes through a mating hole in the top plate. A clamping ring is fitted on the guide rod to limit the downward movement distance of the top plate. The base includes a lower support plate, an upper support plate parallel to the lower support plate, and a force sensor between the upper and lower support plates. The lower support plate is disposed on the base plate, the upper support plate is used to place the lithium battery under test, and the force sensor is used to detect the impact force when the hammer impacts the lithium battery under test. The buffer unit includes an optical switch for detecting the position of the top plate and / or the hammer, and hydraulic cylinders disposed on the left and right sides of the base. The hydraulic cylinders are vertically disposed. When the optical switch is triggered, the hydraulic rod of the hydraulic cylinder rises, lifting the top plate upwards to prevent the hammer from falling again after rebounding.

2. The high-speed impact testing apparatus for lithium battery safety testing according to claim 1, characterized in that: A linear bearing is embedded in the mating hole, and the linear bearing is slidably sleeved on the upper end of the guide rod.

3. The high-speed impact testing apparatus for lithium battery safety testing according to claim 1, characterized in that: The clamping ring includes an open ring with an opening and a bolt for locking the open ring. The open ring is sleeved on the guide rod. The outer diameter of the open ring is larger than the diameter of the mating hole. The opening width of the open ring is 5-10mm.

4. The high-speed impact testing apparatus for lithium battery safety testing according to claim 3, characterized in that: The middle part of the bolt extends across the opening, and the bolt passes through one end of the opening ring and is threaded to the other end. When the bolt is tightened, the relative position of the opening ring and the guide rod remains locked. When the bolt is loosened, the opening ring can move up and down along the guide rod.

5. The high-speed impact testing apparatus for lithium battery safety testing according to claim 1, characterized in that: The mechanical sensor includes an upper cone, a lower cone, a rectangular block, and strain gauges. The upper and lower cones are rigid bodies, and they abut against the upper and lower surfaces of the rectangular block. The rectangular block is a flexible body, and the strain gauges are disposed on the sidewalls of the rectangular block to detect the impact force generated when the hammer impacts the lithium battery under test.

6. The high-speed impact testing apparatus for lithium battery safety testing according to claim 5, characterized in that: The upper cone is a cone with a larger top and a smaller bottom, with the top and bottom surfaces respectively abutting against the lower surface of the upper support plate and the upper surface of the rectangular block. The lower cone is a cone with a smaller top and a larger bottom, with the top and bottom surfaces respectively abutting against the lower surface of the rectangular block and the upper surface of the lower support plate.

7. The high-speed impact testing apparatus for lithium battery safety testing according to claim 6, characterized in that: The upper cone and the lower cone are coaxially arranged. The upper end of the upper cone is provided with an upper skirt that extends horizontally outward, and the upper skirt is fixedly connected to the upper support plate. The lower end of the lower cone is provided with a lower skirt that extends horizontally outward, and the lower skirt is fixedly connected to the lower support plate.

8. The high-speed impact testing apparatus for lithium battery safety testing according to claim 5, characterized in that: There are at least two strain gauges, which are respectively disposed on two mutually perpendicular sidewalls of the rectangular block.

9. The high-speed impact testing apparatus for lithium battery safety testing according to claim 1, characterized in that: The buffer unit also includes a support frame for supporting the optical switch. The support frame is located on the right side of the base plate. The support frame includes a main support rod extending vertically and multiple auxiliary support rods evenly distributed around the main support rod. The auxiliary support rods are inclined, with their upper ends connected to the middle of the main support rod and their lower ends flush with the bottom of the main support rod. The optical switch is located at the top of the main support rod.

10. The high-speed impact testing apparatus for lithium battery safety testing according to claim 1, characterized in that: The upper end of the hydraulic rod is provided with a spring-loaded support head.

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