A mechanical impact test device for lithium batteries

Abstract

The application relates to the technical field of battery impact test, in particular to a lithium battery mechanical impact test device; when sleeve one rotates counterclockwise, the adjusting block two on the outer side of sleeve one rotates synchronously, so that the adjusting block two counterclockwise rotates into the driving groove two in the lower inner wall of sleeve two, then the driving motor rotates, so that the gear drives the impact rod to move upwards, in the process, the adjusting block one on the outer side of the impact rod drives sleeve one to move upwards, the adjusting block two on the outer side of sleeve one drives sleeve two to move upwards, sleeve two drives impact head three to move upwards, so that impact head one, impact head two and impact head three synchronously impact the lower end of the battery pack, data when the impact heads of different sizes impact are obtained, and workers do not need to disassemble and replace the impact heads, so that the test efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of battery impact testing technology, specifically to a lithium battery mechanical impact testing device. Background Technology

[0002] During actual driving, the undercarriage of a vehicle experiences extremely complex conditions. When skimming over potholes, bumps, or rocky surfaces, the undercarriage is highly susceptible to varying degrees of impact and scraping. The power battery pack of new energy vehicles, serving as the power source, is typically installed in the chassis. This design reduces the ground clearance of electric vehicles, further increasing the risk of undercarriage collisions. Based on market research and analysis, common undercarriage misuse scenarios can be categorized as undercarriage scraping, bottoming out, and ball impact / puncture. Undercarriage scraping commonly occurs when road bumps scrape against the vehicle's chassis; bottoming out is similar to the impact of road bumps on the chassis after deceleration; and undercarriage ball impact / puncture corresponds to situations where flying debris from the road impacts the chassis at high speed.

[0003] In common battery pack mechanical safety analysis, bottom impact has a significant impact on the safety performance of the battery pack. In order to analyze the safety status of the battery system under bottom impact conditions, the manufacturer conducts bottom impact tests on the battery pack and analyzes the deformation of its shell and the abnormal phenomena generated by the battery pack under ball impact, puncture and stress conditions.

[0004] Existing methods for impact testing batteries typically involve impacting the battery pack from the top with an upward-facing impact head. The impact force is then used to assess the battery pack's condition and obtain impact data. However, to obtain sufficient data, impact heads of different sizes are usually used. Existing impact testing equipment requires replacing the impact head with different sizes, making the replacement process cumbersome. While spraying water continuously acts on the battery pack surface, the contact area and cooling effect are relatively limited, potentially failing to quickly and comprehensively reduce the internal temperature of the battery pack.

[0005] In summary, to solve the technical problems raised in this paper, this invention proposes a lithium battery mechanical impact testing device. Summary of the Invention

[0006] This invention proposes a lithium battery mechanical impact testing device, which includes a battery mounting frame, a slide rail below the battery mounting frame, and a movable frame mounted on the slide rail; the movable frame is equipped with a base plate, a mounting plate, a limiting plate, and a positioning plate mounted from bottom to top via four limiting posts, and the movable frame is provided with:

[0007] A drive motor, with gears installed at the output end of the drive motor;

[0008] The installation disk is located at the center of the upper end of the installation plate;

[0009] The impact rod has an impact head at its upper end and its lower end passes through the middle of the mounting plate and is located below the mounting plate. The impact rod has a rack structure at the bottom and meshes with a gear. Three adjusting blocks are evenly fixed to the side wall of the impact rod. The impact rod is set in two sections, and a motor is set between the two sections.

[0010] A sleeve is fitted onto the outer ring of the impact rod. An impact head is provided at the upper end of the sleeve. A groove is provided on the impact head. The groove is connected to the inner ring of the sleeve. Three sliding grooves are provided on the inner ring of the sleeve. An adjusting block is located inside the sliding groove. A drive groove is provided at the lower end of the sliding groove on the sleeve. The size of the drive groove is larger than that of the sliding groove.

[0011] As a preferred embodiment of this application, the outer ring of the first sleeve is fitted with the second sleeve, the upper end of the second sleeve is provided with the third impact head, the middle of the upper end of the third impact head is provided with the second column groove, the second column groove is connected to the inside of the second sleeve, the inner ring of the second sleeve is evenly provided with three sliding grooves, and the outer ring of the first sleeve is evenly fixed with three adjusting blocks two, the adjusting blocks two are located inside the sliding grooves of the inner ring of the second sleeve.

[0012] The lower end of the sliding groove inside the second sleeve is provided with a second drive groove.

[0013] As a preferred embodiment of this application, the diameter of the first groove is larger than the inner diameter of the first sleeve, and the diameter of the first impact head is the same as the size of the first groove; the diameter of the second groove is larger than the inner diameter of the second sleeve, and the diameter of the second impact head is the same as the diameter of the second groove.

[0014] As a preferred embodiment of this application, the lower end of the groove on the inner side of the sleeve is connected to the middle part of the drive groove, so that the groove on the inner side of the sleeve and the drive groove form an inverted T-shaped structure.

[0015] The lower inner wall of the first column groove is provided with a protrusion. The upper center of the first impact head is provided with a needle groove. The diameter of the lower part of the needle groove is larger than that of the upper part. A needle is provided inside the needle groove. A drive column is provided at the lower end of the needle. The drive column is located in the lower part of the needle groove, and the outer wall of the drive column is spirally connected to the lower part of the needle groove. The first impact head is provided with a fan-shaped groove inside. The fan-shaped groove is connected to the needle groove. An arc-shaped groove is provided at the lower end of the side of the fan-shaped groove away from the needle groove. A slider is slidably connected inside the arc-shaped groove. A connecting rod is provided inside the fan-shaped groove. One end of the connecting rod is connected to the slider. The other end of the connecting rod is slidably connected to the drive column. A groove is provided at the lower end of the slider. The size of the groove is the same as the size of the protrusion.

[0016] As a preferred embodiment of this application, when the connecting rod is located in the middle of the sector groove and the slider is located in the middle of the arc groove, the upper end of the needle and the upper end of the impact head are on the same plane; at the same time, the adjusting block is located in the groove inside the sleeve.

[0017] As a preferred embodiment of this application, the lower end of the impact rod is provided with a cross plate, and the four ends of the cross plate are respectively sleeved on four limiting posts and slidably connected with the limiting posts.

[0018] As a preferred embodiment of this application, springs are provided on the upper sides of all four ends of the cross plate, the springs are sleeved on the outside of the limiting post, and the upper end of the spring contacts the lower end of the mounting plate.

[0019] As a preferred embodiment of this application, the battery mounting bracket includes a support plate and a mounting plate frame, wherein there are two support plates and the mounting plate frame is rotatably connected between the two support plates.

[0020] The beneficial effects of this invention are as follows:

[0021] When sleeve one rotates counterclockwise, the adjusting block two on the outer side of sleeve one rotates synchronously, causing the adjusting block two to rotate counterclockwise and enter the driving groove two on the lower inner wall of sleeve two. Then the drive motor rotates, causing the gear to drive the impact rod to move upward. During this process, the adjusting block one on the outer side of the impact rod drives sleeve one to move upward, the adjusting block two on the outer side of sleeve one drives sleeve two to move upward, and sleeve two drives impact head three to move upward. This allows impact head one, impact head two, and impact head three to simultaneously perform an impact test on the lower end of the battery pack, enabling the acquisition of data on impacts from impact heads of different sizes. Furthermore, it eliminates the need for personnel to disassemble and replace the impact heads, thus improving testing efficiency. Attached Figure Description

[0022] Figure 1 This is a perspective view of the experimental apparatus in this invention;

[0023] Figure 2 yes Figure 1 A partial structural view of the medium-speed mobile frame;

[0024] Figure 3 yes Figure 2 A partial sectional view in the document;

[0025] Figure 4 yes Figure 2 Side view in the middle;

[0026] Figure 5 These are structural views of sleeve one and sleeve two in this invention;

[0027] Figure 6 This is a partial cross-sectional view of the impact rod in this invention;

[0028] Figure 7This is a partial cross-sectional view of the first sleeve in this invention;

[0029] Figure 8 This is a partial cross-sectional view of the second sleeve in this invention;

[0030] Figure 9 This is a structural view of the impact head in this invention;

[0031] Figure 10 This is a partial cross-sectional view of the sleeve and the impact head in this invention;

[0032] Figure 11 yes Figure 10 A magnified view of a section at point A in the middle;

[0033] Figure 12 This is a structural view of the needle groove, fan-shaped groove, and arc-shaped groove in this invention.

[0034] In the diagram: Battery mounting bracket 1, slide rail 2, moving frame 3, base plate 31, mounting plate 32, limit plate 33, positioning plate 34, drive motor 35, gear 351, mounting disc 321, impact rod 36, impact head 1 361, adjusting block 1 362, sleeve 1 37, impact head 2 371, column groove 1 372, slide groove 373, drive groove 1 374, sleeve 2 38, impact head 381, column groove 2 382, ​​adjusting block 2 352, drive groove 2 383, protrusion 375, needle groove 363, needle 364, drive column 365, fan-shaped groove 366, arc-shaped groove 367, slider 368, connecting rod 369, cross plate 39, spring 391, support plate 11, mounting plate frame 12. Detailed Implementation

[0035] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0036] Example 1:

[0037] like Figures 1 to 12 As shown; a lithium battery mechanical impact testing device, the testing device includes a battery mounting frame 1, a slide rail 2 below the battery mounting frame 1, and a movable frame 3 mounted on the slide rail 2; the movable frame 3 is equipped with a base plate 31, a mounting plate 32, a limiting plate 33, and a positioning plate 34 mounted from bottom to top on four limiting posts; the movable frame 3 is provided with:

[0038] A drive motor 35 is provided, and a gear 351 is provided at the output end of the drive motor 35.

[0039] Installation disk 321 is located at the center of the upper end of installation plate 32;

[0040] The impact rod 36 has an impact head 361 at its upper end and its lower end passes through the middle of the mounting plate 32 and is located below the mounting plate 32. The lower end of the impact rod 36 has a rack structure and meshes with the gear 351. Three adjusting blocks 362 are evenly fixed to the side wall of the impact rod 36. The impact rod 36 is set in two sections, and a motor is set between the two sections.

[0041] A sleeve 37 is fitted onto the outer ring of the impact rod 36. An impact head 371 is provided at the upper end of the sleeve 37. A groove 372 is provided on the impact head 371. The groove 372 communicates with the inner ring of the sleeve 37. Three sliding grooves 373 are provided on the inner ring of the sleeve 37. An adjusting block 362 is located inside the sliding groove 373. A drive groove 374 is provided at the lower end of the sliding groove 373 on the sleeve 37. The size of the drive groove 374 is larger than that of the sliding groove 373.

[0042] The outer ring of sleeve 1 37 is fitted with sleeve 2 38. The upper end of sleeve 2 38 is provided with impact head 381. The upper middle part of impact head 381 is provided with column groove 2 382. Column groove 2 382 is connected to the inside of sleeve 2 38. The inner ring of sleeve 2 38 is evenly provided with three sliding grooves 373. The outer ring of sleeve 1 37 is evenly fixed with three adjusting blocks 2 352. The adjusting blocks 2 352 are located inside the sliding grooves 373 of the inner ring of sleeve 2 38.

[0043] The lower end of the sliding groove 373 inside the sleeve 2 38 is provided with a drive groove 2 383.

[0044] The specific workflow is as follows:

[0045] First, the battery pack is installed on the battery mounting bracket 1. After the battery pack is installed, the movable bracket 3 is moved on the slide rail 2 so that the movable bracket 3 moves to the bottom of the battery pack. Then, the drive motor 35 is started, and the gear 351 on the drive motor 35 rotates. The gear 351 meshes with the rack structure at the lower end of the impact rod 36, so that the gear 351 drives the impact rod 36 to move upward. The impact head 361 on the impact rod 36 moves upward. During the process, the adjustment block 362 set on the outside of the impact rod 36 is not inside the drive groove 374 inside the sleeve 37. So, during the upward movement of the impact rod 36, the adjustment block 362 on the outside of the impact rod 36 slides upward in the slide groove 373 inside the sleeve 37 until the impact head 361 impacts the lower end of the battery pack, thus realizing the impact test on the lower end of the battery pack.

[0046] If a larger impact head is required to conduct an impact test on the lower end of the battery pack, the operator starts the motor between the two sections of the impact rod 36. The motor drives the impact rod 36 to rotate counterclockwise, and the adjusting block 362 on the outer side of the impact rod 36 rotates counterclockwise, causing the adjusting block 362 to enter the drive groove 374 below the inner sliding groove 373 of the sleeve 37. Then, the motor between the two sections of the impact rod 36 stops rotating, and the drive motor 35 rotates. The gear 351 at the end of the drive motor 35 engages with the lower side of the impact rod 36. The rack and pinion structure meshes, the impact rod 36 moves upward, and the adjusting block 362 on the outside of the impact rod 36 moves upward. During this process, the inner wall of the drive groove 374 on the inner side of the sleeve 37 blocks the adjusting block 362, so that the adjusting block 362 drives the sleeve 37 and the impact head 371 on the sleeve 37 to move upward synchronously, so that the impact head 361 and the impact head 371 simultaneously impact the lower end of the battery pack, realizing the impact test of the battery pack being subjected to a larger impact head, and thus obtaining impact data of impact heads of different sizes.

[0047] When the impact head 371 is not needed, the impact rod 36 is reset, and the impact head 361 at the upper end of the impact rod 36 is embedded in the column groove 372. Then the motor between the two impact rods 36 is reversed, so that the adjusting block 362 does not enter the drive groove 374. When the impact rod 36 moves upward, the adjusting block 362 moves up and down in the sliding groove 373 inside the sleeve 37.

[0048] A second sleeve 38 is installed inside the first sleeve 37, and an impact head 381 is installed on the second sleeve 38. In the initial state, the second impact head 371 is embedded in the groove 382 on the third impact head 381. When an impact head larger than the second impact head 371 is required, the motor between the two impact rods 36 rotates counterclockwise, causing the adjusting block 362 on the outer side of the upper impact rod 36 to enter the drive groove 374 on the lower inner wall of the first sleeve 37. Subsequently, the impact rod 36 continues to rotate, and the adjusting block 362 pushes the drive groove 374 on the first sleeve 37, thereby causing the first sleeve 37 to rotate counterclockwise. When the first sleeve 37 rotates counterclockwise, the adjusting block 35 on the outer side of the first sleeve 37... 2. The synchronous rotation causes the adjusting block 352 to rotate counterclockwise and enter the drive groove 383 on the lower inner wall of the sleeve 38. Then the drive motor 35 rotates, causing the gear 351 to drive the impact rod 36 to move upward. During this process, the adjusting block 362 on the outside of the impact rod 36 drives the sleeve 37 to move upward, the adjusting block 352 on the outside of the sleeve 37 drives the sleeve 38 to move upward, and the sleeve 38 drives the impact head 381 to move upward. This allows the impact head 361, impact head 371 and impact head 381 to synchronously perform an impact test on the lower end of the battery pack, so as to obtain data on the impact of impact heads of different sizes, and eliminate the need for staff to disassemble and replace the impact heads, thus improving the test efficiency.

[0049] When only impact head 361 and impact head 371 are used, the adjusting block 352 on the outside of sleeve 37 is not in the drive groove 383, and sleeve 37 moves up and down in the sliding groove 373 on the inside of sleeve 38.

[0050] Example 2:

[0051] like Figures 2 to 12 As shown; the diameter of groove 372 is larger than the inner diameter of sleeve 37, and the diameter of impact head 361 is the same as the size of groove 372; the diameter of groove 382 is larger than the inner diameter of sleeve 38, and the diameter of impact head 371 is the same as the diameter of groove 382.

[0052] The lower end of the sliding groove 373 on the inner side of the sleeve 37 is connected to the middle part of the drive groove 374, so that the sliding groove 373 on the inner side of the sleeve 37 and the drive groove 374 form an inverted T-shaped structure.

[0053] The lower inner wall of the groove 372 is provided with a protrusion 375. A needle groove 363 is formed at the center of the upper end of the impact head 361. The diameter of the lower part of the needle groove 363 is larger than that of the upper part. A needle 364 is provided inside the needle groove 363. A drive post 365 is provided at the lower end of the needle 364. The drive post 365 is located in the lower part of the needle groove 363, and the outer wall of the drive post 365 is spirally connected to the lower part of the needle groove 363. A fan-shaped... The fan-shaped groove 366 is connected to the needle-punching groove 363. An arc-shaped groove 367 is opened at the lower end of the side of the fan-shaped groove 366 away from the needle-punching groove 363. The slider 368 is slidably connected inside the arc-shaped groove 367. A connecting rod 369 is provided inside the fan-shaped groove 366. One end of the connecting rod 369 is connected to the slider 368, and the other end of the connecting rod 369 is slidably connected to the drive column 365. A groove is opened at the lower end of the slider 368. The size of the groove is the same as the size of the protrusion 375.

[0054] When the connecting rod 369 is located in the middle of the sector groove 366 and the slider 368 is located in the middle of the arc groove 367, the upper end of the needle 364 is on the same plane as the upper end of the impact head 361; at the same time, the adjusting block 362 is located in the slide groove 373 inside the sleeve 37.

[0055] The specific workflow is as follows:

[0056] This arrangement ensures that the diameter of groove 372 is larger than the inner diameter of sleeve 37, and the inner diameter of impact head 361 is the same as the inner diameter of groove 372. Simultaneously, the diameter of groove 382 is larger than the inner diameter of sleeve 38, and the diameter of impact head 371 is the same as the inner diameter of impact head 371. As adjusting block 362 pushes sleeve 37 upwards, the diameter of impact head 361 is larger than the inner diameter of sleeve 37, causing the lower end of impact head 361 to be positioned within groove 372. The lower end of 361 limits the lower inner wall of the column groove 372, and the adjusting block 362 limits the lower end of the sleeve 37. This ensures that as the impact rod 36 drives the sleeve 37 to move upward, the sleeve 37 and the impact rod 36 move synchronously, and there will be no relative movement between the impact rod 36 and the sleeve 37. Similarly, as the sleeve 37 drives the sleeve 38 to move up and down, the sleeve 37 and the sleeve 38 are in a relatively stationary state, and there will be no relative movement.

[0057] Based on the above embodiment one, the inner side of the sleeve 371 is connected to the middle of the drive groove 374, so that the inner side of the sleeve 371 and the drive groove 374 form an inverted T-shaped structure; when the impact head 371 is needed, the motor between the two sections of the impact rod 36 rotates counterclockwise, and the adjusting block 362 enters one side of the inner side of the sleeve 371; so that the impact rod 36 drives the impact one and the impact head 371 to move upward.

[0058] When a needle penetration test is required on the battery pack, the operator controls the motor between the two sections of the impact rod 36 to rotate clockwise. When the adjusting block 362 is located in the middle of the drive groove 374, that is, when the adjusting block 362 slides up and down inside the sliding groove 373 on the inner side of the sleeve 37, the upper end of the needle 364 and the upper end of the impact head 361 are on the same arc surface. The drive post 365 at the lower end of the needle 364 is spirally connected to the lower part of the needle penetration groove 363 (specifically, a spiral groove is opened on the inner wall of the lower end of the needle penetration groove 363, and a limiting post is set on the outer side of the drive post 365), causing the impact rod 36 to rotate counterclockwise. When rotating, the impact head 361 rotates in the groove 372, while the protrusion 375 on the inner wall of the groove 372 remains stationary. At the same time, the protrusion 375 is embedded in the groove of the slider 368, causing the slider 368 to rotate in the arc groove 367. During the rotation of the slider 368 in the arc groove 367, the slider 368 drives the drive column 365 to rotate through the connecting rod 369. A rectangular groove is opened through the drive column 365, and the connecting rod 369 is slidably connected in the rectangular groove, so that the connecting rod 369 can only slide up and down in the rectangular groove on the drive column 365. When the impact rod 36 rotates counterclockwise, the drive column 365 moves downward.

[0059] When the needle 364 is needed, the motor between the two sections of the impact rod 36 is controlled to rotate clockwise. Similarly, the protrusion 375 in the first groove 372 remains stationary. The slider 368 drives the drive column 365 to rotate through the connecting rod 369. However, at this time, the drive column 365 moves upward. The needle 364 above the drive column 365 extends from the upper end of the first impact head 361. Then, the drive motor 35 drives the impact rod 36 to move upward. The first impact head 361, the second impact head 371 and the needle 364 move upward synchronously. The needle 364 performs a needle puncture test on the lower end of the battery pack. It is worth noting that during this process, the sleeve 37 does not participate in the rotation, and the adjusting block 362 only moves in the drive groove 374.

[0060] Example 3:

[0061] like Figures 2 to 12 As shown; the lower end of the impact rod 36 is provided with a cross plate 39, and the four ends of the cross plate 39 are respectively sleeved on the four limiting posts and slidably connected with the limiting posts;

[0062] Springs 391 are provided on the upper sides of all four ends of the cross plate 39. The springs 391 are sleeved on the outside of the limiting post, and the upper end of the springs 391 contacts the lower end of the mounting plate 32.

[0063] The specific workflow is as follows:

[0064] By setting a cross plate 39 at the lower end of the impact rod 36, with the four ends of the cross plate 39 respectively sleeved on the four limiting posts and slidably connected to the limiting posts, and by evenly arranging springs 391 on the upper side of the four ends of the cross plate 39 and sleeved on the outside of the limiting posts, so that the upper end of the springs 391 contacts the lower end of the mounting plate 32, the cross plate 39 can limit the lower end of the impact rod 36 during the up and down movement of the impact rod 36 when driven by the drive motor 35. At the same time, the springs 391 set at the upper end of the cross plate 39 can play a role in buffering the impact rod 36.

[0065] Example 4:

[0066] like Figures 1 to 12 As shown; the battery mounting bracket 1 includes a support plate 11 and a mounting plate frame 12. There are two support plates 11, and the mounting plate frame 12 is rotatably connected between the two support plates 11.

[0067] The specific workflow is as follows:

[0068] By including a support plate 11 and a mounting plate frame 12 in the battery mounting bracket 1, the mounting plate frame 12 is rotatably connected between the two support plates 11. When the battery pack is subjected to an impact test, the battery pack is mounted on the mounting plate frame 12. Then, the moving frame 3 moves to the bottom of the battery pack and the drive motor 35 is started, so that the impact head 361, impact head 371, impact head 381 and the piercing needle 364 can conduct an impact test on the battery pack. Furthermore, by rotatably connecting the mounting plate frame 12 between the two support plates 11, the mounting plate frame 12 can rotate on the support plates 11 during the impact test, so that the battery pack forms an angle with the ground. At this time, when the battery pack is impacted, impacts at different angles can be simulated, thus diversifying the data obtained during the impact test of the battery pack.

[0069] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

[0070] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A lithium battery mechanical impact testing device, the testing device comprising a battery mounting frame, a slide rail below the battery mounting frame, and a movable frame mounted on the slide rail; wherein a base plate, a mounting plate, a limiting plate, and a positioning plate are mounted on the movable frame from bottom to top via four limiting posts, characterized in that, The mobile frame is equipped with: A drive motor, with gears installed at the output end of the drive motor; The installation disk is located at the center of the upper end of the installation plate; An impact rod has an impact head at its upper end and its lower end penetrates the middle of the mounting plate and is located below the mounting plate. The lower end of the impact rod has a rack structure and meshes with a gear. Three adjusting blocks are evenly fixed to the side wall of the impact rod. The impact rod is set in two sections, and a motor is set between the two sections. A sleeve is fitted onto the outer ring of the impact rod. An impact head is provided at the upper end of the sleeve. A groove is provided on the impact head. The groove is connected to the inner ring of the sleeve. Three sliding grooves are provided on the inner ring of the sleeve. An adjusting block is located inside the sliding groove. A driving groove is provided at the lower end of the sliding groove on the sleeve. The size of the driving groove is larger than that of the sliding groove. The outer ring of the first sleeve is fitted with the second sleeve. The upper end of the second sleeve is provided with the third impact head. The middle of the upper end of the third impact head is provided with the second column groove, which is connected to the inside of the second sleeve. The inner ring of the second sleeve is evenly provided with three sliding grooves. The outer ring of the first sleeve is evenly fixed with three second adjusting blocks. The second adjusting blocks are located inside the sliding grooves of the inner ring of the second sleeve. The lower end of the sliding groove inside the second sleeve is provided with a second driving groove; The lower end of the inner groove of the sleeve is connected to the middle of the drive groove, so that the inner groove of the sleeve and the drive groove form an inverted T-shaped structure. The lower inner wall of the first column groove is provided with a protrusion. The upper center of the first impact head is provided with a needle groove. The diameter of the lower part of the needle groove is larger than that of the upper part. A needle is provided inside the needle groove. A driving post is provided at the lower end of the needle. The driving post is located in the lower part of the needle groove, and the outer wall of the driving post is spirally connected to the lower part of the needle groove. The first impact head is provided with a fan-shaped groove inside. The fan-shaped groove is connected to the needle groove. An arc-shaped groove is provided at the lower end of the side of the fan-shaped groove away from the needle groove. A slider is slidably connected inside the arc-shaped groove. A connecting rod is provided inside the fan-shaped groove. One end of the connecting rod is connected to the slider. The other end of the connecting rod is slidably connected to the driving post. A groove is provided at the lower end of the slider. The size of the groove is the same as the size of the protrusion.

2. The lithium battery mechanical impact testing device as described in claim 1, characterized in that: The diameter of the first groove is greater than the inner diameter of the first sleeve, and the diameter of the first impact head is the same as the size of the first groove; the diameter of the second groove is greater than the inner diameter of the second sleeve, and the diameter of the second impact head is the same as the diameter of the second groove.

3. The lithium battery mechanical impact testing device as described in claim 1, characterized in that: When the connecting rod is located in the middle of the sector groove and the slider is located in the middle of the arc groove, the upper end of the needle and the upper end of the impact head are on the same plane; at the same time, the adjusting block is located in the sliding groove inside the sleeve.

4. The lithium battery mechanical impact testing device as described in claim 1, characterized in that: The lower end of the impact rod is provided with a cross plate, and the four ends of the cross plate are respectively sleeved on four limiting posts and slidably connected to the limiting posts.

5. The lithium battery mechanical impact testing device as described in claim 4, characterized in that: Springs are provided on the upper sides of all four ends of the cross plate. The springs are sleeved on the outside of the limiting post, and the upper end of the springs is in contact with the lower end of the mounting plate.

6. The lithium battery mechanical impact testing device as described in claim 1, characterized in that: The battery mounting bracket includes a support plate and a mounting plate frame. There are two support plates, and the mounting plate frame is rotatably connected between the two support plates.

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