Mobile power battery pack bottom ball impact test impact device

Abstract

A mobile power battery pack bottom ball impact test impact device, including mobile base plate, impact device support, impact device driving part and impact ball head, impact device support is installed on the mobile base plate, and the impact device driving part is installed on the impact device support; The impact device driving part is a linear motor driving part powered by a linear motor, the linear motor driving part is installed on the impact device support, and the impact ball head is installed on the head of the linear motor driving part. The impact ball head is driven by the linear motor to move up and down. The utility model adopts the linear motor to drive the impact ball head, determines the speed and energy to hit the specified position, compared with the existing spring, pneumatic and other launch modes in the industry, the energy control precision is higher, the repeatability is good, the adjustment and control are convenient, and the operation is simple.

Description

Technical Field

[0001] This utility model relates to a method for testing electric vehicle components, and more particularly to a method for bottom impact testing of a power battery pack for new energy vehicles, belonging to the field of battery pack testing technology. Background Technology

[0002] In today's booming electric vehicle industry, the battery pack, as the "heart" of an electric vehicle, directly affects the vehicle's range, power performance, and user safety experience. Differences in design and structure among different types of battery packs result in varying performance characteristics when subjected to bottom ball impact tests.

[0003] The battery pack bottom ball impact test is an important method for evaluating the impact resistance of electric vehicle battery pack bottoms. This test simulates the impact that the battery pack bottom may experience when a vehicle encounters obstacles (such as speed bumps or stones) during driving, comprehensively testing the structural safety, internal cooling system, and electrical components of the battery pack. Existing test methods are typically conducted under specific environmental conditions (e.g., temperature 22℃±5℃, relative humidity 15%-90%), using a 150mm diameter metal ball impactor to impact the bottom of the battery pack at a speed of 1±0.2mm / s. The impact point is selected within a 240mm radius of the center or geometric center of the battery pack bottom. The impact force is typically 110% of the vehicle's permissible total mass, and the load is sustained for 60 seconds. After unloading, the battery pack is observed for leaks, fires, explosions, etc., and internal electrolyte and coolant leaks are checked. To generate sufficient impact kinetic energy, the current main method is to use springs, cylinders, or electric cylinders to push the impact ball head so that the impact ball head hits the bottom of the battery pack with the required impact force. However, the impact test methods mentioned above generally have the shortcomings of being difficult to control and adjust the impact test force. Therefore, it is difficult to respond in a timely manner when encountering different test requirements. As the requirements for battery pack testing and inspection become more stringent and various tests become more numerous, the original bottom test methods can no longer meet the current requirements and need to be adapted and improved.

[0004] A search revealed no identical technical solutions to this invention; however, some related technical solutions were found, including the following:

[0005] 1. Patent CN202420355559.5 discloses a battery pack bottom ball impact test device, including an impact platform, a power release component, and a power unit. The power release component is pivotally connected to the impact platform so that the angle between the power release direction of the power release component and the horizontal direction is adjustable. An impact ball is connected to the release end of the power release component, and the power unit is installed on the impact platform and is drivenly connected to the input end of the power release component. Although the battery pack bottom ball impact test device provided by this patent application has the advantages of simulating impact operations under complex working conditions and having high accuracy in impact test results, it still uses a conventional method.

[0006] 2. Patent No. CN202310090755.4 discloses a bottom impact test method for new energy vehicle battery packs, including the following steps: lifting the test vehicle to a certain height and placing it in a Ready state; adjusting the height between the impact testing mechanism and the lower surface of the battery pack; conducting impact tests on each marked point one by one, while monitoring and observing changes in battery pack temperature and vehicle electrical safety data; after all marked points have been tested according to technical requirements, lowering the vehicle and placing it in an open area for at least 24 hours, while simultaneously recording battery pack temperature and electrical safety data in real time; measuring the deformation of the marked points on the stationary test vehicle, removing the battery pack after measurement, and conducting a sealing test; repeating the above steps for the remaining vehicles until all tests are completed. This application makes the bottom impact safety test items and test areas for new energy electric vehicle battery packs more complete, and also allows for the evaluation of sealing and wading performance after impact.

[0007] 3. Patent No. CN202111472237.6 discloses a needle penetration and extrusion test bench for new energy vehicle battery packs, including a workbench and a battery pack. A test bench is fixedly installed on the top of the workbench, and a hydraulic cylinder is fixedly installed at the bottom of the inner cavity of the workbench. A placement plate is fixedly installed at the telescopic end of the hydraulic cylinder, and a sealing column is fixedly installed on the top of the placement plate. A fixed platform is fixedly installed on the top of the test bench. This utility model drives the placement plate and the battery pack to move upward synchronously, thereby giving the battery pack an initial acceleration. When the needle penetration and extrusion plate needles and extrudes the battery pack, the two collide, thus simulating the impact force brought about by a real car collision. At the same time, by setting up an isolation plate to simulate the protective function of a battery box, the needle penetration and extrusion test results of the battery pack are more in line with reality, thereby improving the accuracy of the test.

[0008] Based on the analysis of the retrieved patent information, we found that many companies have applied for relevant patents regarding the bottom test of battery packs, but they are all different from the technical solutions proposed in this project. In particular, existing technical solutions cannot solve the problems mentioned above very well, so the problems mentioned above still exist and it is necessary to solve them. Utility Model Content

[0009] The technical problem to be solved by this utility model is: how to further improve the bottom impact test method in accordance with the requirements of the existing bottom impact test of power battery pack, so that the detection is more accurate and the impact energy is easy to adjust; mainly in terms of the movement of the impact head and its control method, it can achieve accurate detection and precise control, and the impact energy is adjustable.

[0010] To address the above problems, the technical solution proposed by this utility model is as follows:

[0011] A mobile power battery pack bottom ball impact test device includes a mobile base plate, an impact device bracket, an impact device drive component, and an impact ball head. The impact device bracket is mounted on the mobile base plate, and the impact device drive component is mounted on the impact device bracket. The impact device drive component is a linear motor drive component powered by a linear motor, which is mounted on the impact device bracket. The impact ball head is mounted on the head of the linear motor drive component, and the linear motor drives the impact ball head to move up and down.

[0012] Furthermore, the linear motor drive component includes a linear motor stator track and a linear motor mover. The linear motor stator track is vertically mounted on the impact device bracket, and the linear motor mover is tightly fastened to the linear motor stator track. The impact ball head is mounted on the linear motor mover and moves up and down with the linear motor mover.

[0013] Furthermore, the impact device support is a tower structure, and the impact device support is mounted on a movable base plate, making it a movable structure; a drive component mounting back plate is provided in the middle of the tower structure, and the linear motor stator rail is mounted on the drive component mounting back plate.

[0014] Furthermore, the linear motor stator track is composed of multiple linear stator coils arranged sequentially from bottom to top along the drive component mounting back plate, and each linear stator coil is fixed to the drive component mounting back plate by fasteners.

[0015] Furthermore, an impact ball joint connecting plate is installed on the upper surface of the linear motor mover, and an impact ball joint connecting support is installed on the upper surface of the impact ball joint connecting plate. The impact ball is fixedly installed on the impact ball joint connecting support and moves up and down together with the linear motor mover.

[0016] Furthermore, the bottom of the impact ball head has a fixed flange, and the impact ball head is installed on the top surface of the impact ball head connecting support through the fixed flange, so that the impact ball head faces upward.

[0017] Furthermore, an impact rail is provided parallel to the linear motor stator track on the drive component mounting back plate, and an impact slider is provided on the impact rail. The impact slider is connected to the impact ball head connecting plate by fasteners, and the impact slider moves up and down together with the linear motor mover.

[0018] Furthermore, the linear motor stator track is a linear rail, which extends from the top of the impact device bracket to the bottom of the impact device bracket, and the mover of the linear motor is fastened to the side of the linear motor stator track.

[0019] Furthermore, the linear motor stator track is a composite track combining straight lines and arcs, consisting of a straight rail and an arc rail combined together to form a composite track with a combination of arc and straight lines.

[0020] Furthermore, the composite track includes two straight rails and one curved rail. The two straight rails are connected by the curved rail to form a composite track. One section is a vertical straight rail, which is arranged on the side of the impact device support from the top to the bottom. The other section is a horizontal straight rail, which is arranged horizontally on the bottom platform of the impact device support. The two straight rails are connected by the curved rail to form a composite track combining straight lines and curves. The mover of the linear motor is mounted on the composite track. After being powered on, the mover of the linear motor first accelerates initially through the horizontal straight rail of the composite track, and then turns through the curved rail. The mover of the linear motor changes from horizontal motion to vertical upward motion, and then accelerates a second time through the vertical straight rail. It moves upward in a straight line from the bottom of the impact device support, driving the impact ball to impact the bottom of the battery pack under test, thus conducting a ball impact test on the bottom of the battery pack.

[0021] Furthermore, the bottom of the movable base plate is equipped with casters and a fixed support rod. The ball impact test device at the bottom of the movable power battery pack moves via the casters and is locked in place by the fixed support rod after it has moved into position.

[0022] Beneficial effects: This utility model changes the impact ball drive method in the battery pack bottom ball impact test to a linear motor drive, which determines the speed and energy to impact the designated position. Compared with existing spring and pneumatic launching modes in the industry, it has higher energy control precision, better repeatability, is easier to adjust and control, and is simpler to operate. It has the following advantages:

[0023] 1. A linear motor is used to accelerate and impact the workpiece, delivering energy to a designated location at a set speed. This method offers high energy precision and, compared to other methods in the industry such as springs and pneumatic launchers, provides more accurate control for bottom impact testing.

[0024] 2. A linear motor is used as the drive device for the impact ball head, which is easy to adjust and control. By adjusting the voltage or frequency, or changing the secondary material, different speeds and electromagnetic thrusts can be obtained, accurately measuring the actual speed before impact with high accuracy. Suitable for various testing conditions.

[0025] 3. The battery bottom test is carried out by electromagnetic catapult using a linear motor, which has high acceleration. This is a significant advantage of linear motor drive compared to other cylinders, hydraulic cylinders, or lead screw, synchronous belt and gear rack drive.

[0026] 4. The use of dual-rail impact operation, consisting of a linear motor stator track and an impact track, can effectively reduce the direct impact of the impact force on the linear stator track and prevent damage to the linear motor stator track.

[0027] 5. The linear motor track adopts a composite magnetic track, which can effectively reduce the required height of the test device and reduce the overall space of the bottom test device through secondary acceleration. Attached Figure Description

[0028] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0029] Figure 2 This is a front structural diagram of the present invention;

[0030] Figure 3 This is a side view of the present invention.

[0031] Figure 4 This is a top view of the structure of this utility model;

[0032] Figure 5 This is a schematic diagram of the linear motor drive component of this utility model;

[0033] Figure 6 A schematic diagram of the connection structure between the impact ball head, the impact ball head connecting plate, and the impact ball head connecting support;

[0034] Figure 7 This is a schematic diagram of the stator track and impact track of a linear motor.

[0035] Figure 8 This is a schematic diagram of the stator track structure in Embodiment 2.

[0036] In the diagram: 1. Movable base plate; 2. Impact device bracket; 3. Impact device drive component; 4. Impact ball head; 5. Linear motor mover; 6. Linear motor stator track; 7. Drive component mounting back plate; 8. Linear stator coil; 9. Impact ball head connecting plate; 10. Impact ball head connecting support; 11. Fixed flange; 12. Impact track; 13. Impact slider; 14. Caster wheel; 15. Fixed support rod; 16. Linear rail; 17. Arc rail; 18. Stator coil; 19. Stator magnetic track; 20. Arc stator coil; 21. Arc stator magnetic track; 22. Anti-mistriggered safety device; 23. Linear stator track. Detailed Implementation

[0037] The present invention will be further described below with reference to the accompanying drawings: Example 1

[0038] like Figure 1 , 2 As shown in Figures 3 and 4, a mobile power battery pack bottom ball impact test device includes a mobile base plate 1, an impact device bracket 2, an impact device drive component 3, and an impact ball head 4. The impact device bracket 2 is mounted on the mobile base plate 1, and the impact device drive component 3 is mounted on the impact device bracket 2. The impact device drive component 3 is a linear motor drive component powered by a linear motor. The linear motor stator rail 6 of the impact device drive component 3 is mounted on the drive component mounting back plate 7 of the impact device bracket 2. The linear motor mover 5 of the impact device drive component 3 is tightly fastened to the linear motor stator rail 6. The linear motor mover 5 and the linear motor stator rail 6 are combined to form a linear motor for linear motion. The impact ball head 4 is mounted on the head of the linear motor mover 5, and the linear motor mover 5 drives the impact ball head 4 to move up and down.

[0039] The impact device support 2 is a tower structure, and the impact device support 2 is mounted on a movable base plate 1, which is a movable structure. A drive component mounting back plate 7 is provided in the middle of the tower structure impact device support 2, and the linear motor stator rail 5 is mounted on the drive component mounting back plate 7.

[0040] The linear motor drive component includes a linear motor stator track 6 and a linear motor mover 5. The linear motor stator track 6 is vertically mounted on the impact device bracket 2, and the linear motor mover 5 is tightly fastened to the linear motor stator track 6. The impact ball head 4 is mounted on the linear motor mover 5 and moves up and down with the linear motor mover 5.

[0041] The linear motor stator track 6 is composed of multiple linear stator coils 8 arranged sequentially from bottom to top along the drive component mounting back plate 7, and each linear stator coil 8 is fixed to the drive component mounting back plate 7 by fasteners.

[0042] An impact ball head connecting plate 9 is installed on the upper surface of the linear motor mover 6, and an impact ball head connecting support 10 is installed on the upper surface of the impact ball head connecting plate 9. The impact ball head 4 is fixedly installed on the impact ball head connecting support 10. The impact ball head connecting plate 9 drives the impact ball head connecting support 10 and the impact ball head 4 installed on the impact ball head connecting support 10 to move up and down together with the linear motor mover 5, and performs accelerated ejection impact motion when moving from bottom to top.

[0043] The impact ball head 4 has a fixed flange 11 at its bottom. The impact ball head 4 is installed on the top surface of the impact ball head connecting support 10 through the fixed flange 11, so that the impact ball head 4 faces upward.

[0044] An impact rail 12 is mounted on the drive component mounting back plate 7, parallel to the linear motor stator rail 6. An impact slider 13 is mounted on the impact rail 12 and is connected to the impact ball head connecting plate 9 by fasteners. The impact slider 13 moves up and down along the impact rail 12 with the linear motor mover. The impact test is completed using a double-structure sliding rail, which can effectively reduce the damage to the linear motor stator rail caused by the recoil force during ball head impact.

[0045] The linear motor stator track 6 is a linear rail formed by combining multiple stator tracks, extending from the top of the drive component mounting back plate 7 to the bottom of the drive component mounting back plate 7. The linear motor mover 5 is fastened to the linear motor stator track 6 with a sliding mounting structure.

[0046] The bottom of the movable base plate 1 is provided with casters 14 and fixed support rods 15. The ball impact test device at the bottom of the movable power battery pack moves through the casters 14 and is locked in place by the fixed support rods 13 after it moves into position.

[0047] In addition, a safety device 22 to prevent accidental triggering is provided at the launch port of the linear motor stator track 6 of the ball impact test device at the bottom of the mobile power battery pack. Preferably, the safety device 22 to prevent accidental triggering is a proximity switch light, which prevents the impact ball head 4 from falling off through electromechanical linkage.

[0048] The battery pack bottom ball impact test includes at least the following steps:

[0049] 1) Raise the ball impact test stand at the bottom of the battery pack

[0050] Based on the required space height for the bottom impact test of the linear motor, adjust the height of the ball impact test bench platform at the bottom of the battery pack so that the space height of the bottom surface of the ball impact test bench platform at the bottom of the battery pack is sufficient for the operation of the linear motor.

[0051] 2) Install the battery pack with test attachment onto the ball impact test platform at the bottom of the battery pack.

[0052] After adjusting the height of the ball impact test platform at the bottom of the battery pack, lock the ball impact test platform at the bottom of the battery pack. Then, use a crane to lift the battery pack to be tested onto the upper surface of the ball impact test platform at the bottom of the battery pack and fix it using a pressure plate.

[0053] 3) Set up the bottom impact test device for the linear motor.

[0054] Move the linear motor bottom impact test device to the bottom ball impact test bench test platform of the battery pack and align it with the bottom test position of the battery pack to be tested; and install the impact ball head on the head of the linear motor mover of the linear motor bottom impact test device so that the impact ball head is aligned with the bottom test position of the battery pack to be tested.

[0055] 4) Conduct a bottom impact test on the battery pack.

[0056] The linear motor is started, and the linear motor mover drives the impact ball head to accelerate and impact the test position of the battery pack under test in an electromagnetic catapult manner. It is ensured that the speed and energy when the impact ball head contacts the bottom test position of the battery pack under test meet the requirements of the test standard, and the corresponding test data are recorded by the set detection sensor.

[0057] 5) Evacuate after the test is completed

[0058] After the nose impact test of the battery pack is completed, the bottom impact test device of the linear motor is removed, the tooling of the battery pack to be tested is then untied, and the battery pack to be tested is hoisted down from the bottom ball impact test stand. The entire test is then completed. Example 2

[0059] The principle of Example 2 is the same as that of Example 1, except that the specific structure of Example 2 is different from that of Example 1. It is a method for completing the bottom test of the battery pack based on the linear motor launching the impact ball head. The battery pack to be tested is placed on the bottom impact test stand of the battery pack. The power device of the bottom impact test device drives the impact ball head of the bottom impact test of the battery pack to impact the battery pack from the bottom. The power device is a linear motor. The impact ball head is installed at the head of the linear motor. The linear motor drives the impact ball head to impact the battery pack from the bottom according to the impact force and impact mode required for the bottom impact test of the battery pack.

[0060] The linear motor bottom impact test device is constructed by laying a linear motor track on the linear motor bottom impact test device. This involves setting an impact device bracket for the linear motor bottom impact test device between two support frames of the battery pack bottom ball impact test bench. A linear motor stator track is arranged from top to bottom on the impact device bracket, forming the motion track of the linear motor mover. The linear motor mover is then fastened onto the linear motor stator track. After power is applied, the linear motor mover will move from bottom to top along the linear motor stator track, achieving the bottom impact of the battery pack under test.

[0061] The linear motor stator track is a composite track combining straight lines and arcs, consisting of straight rails and arc rails, forming a composite track with a combination of arc and straight lines.

[0062] The composite track includes two straight rails 16 and one arc rail 17. The two straight rails 16 are connected by the arc rail 17 to form a composite track. One section is a vertical straight rail, which is arranged on the bottom surface of the impact device bracket from the top to the bottom of the drive component mounting back plate 7 of the impact device bracket 2. The other section is a horizontal straight rail, which is arranged horizontally on the bottom platform of the impact device bracket. The two straight rails 16 are connected by the arc rail 17 to form a composite track combining straight lines and arcs. The linear motor mover is fastened to the composite track. After being powered on, the linear motor mover 5 first accelerates initially through the horizontal straight rail of the composite track, and then turns through the arc rail. The linear motor mover 5 changes from horizontal movement to vertical upward movement, and then accelerates again through the vertical straight rail. It moves upward in a straight line from the bottom of the impact device bracket, driving the impact ball head to impact the bottom of the battery pack under test, and conducts a ball impact test on the bottom of the battery pack under test.

[0063] The curvature of the arc-shaped rail must ensure that the linear motor mover moves unimpeded. The minimum radius of curvature is proportional to the length of the linear motor mover, the speed of the linear motor mover when passing through the arc-shaped rail, and the mass of the combination of the linear motor mover and the impact ball head.

[0064] The minimum radius of curvature is not less than twice the length of the linear motor mover.

[0065] The linear rail 16 is the same as in Embodiment 1. The stator coils 18 of the linear motor are arranged from top to bottom on the drive component mounting back plate 7 of the impact device bracket 2 and on the movable base plate 1. Then, stator magnetic rails 19 are laid on the stator coils 18. The linear rail 16, which is the linear motor stator track for the linear motor to run, is formed by the combination of multiple stator coils 18 and stator magnetic rails 19. The arc-shaped rail 17 is formed by the combination of arc-shaped stator coils 20 and arc-shaped stator magnetic rails 21. The arc-shaped rail 17, which is the linear motor stator track for the linear motor to run, is formed by the combination of multiple arc-shaped stator coils 20 and arc-shaped stator magnetic rails 21. Then, the linear motor mover 5 is fastened onto the linear motor stator track 6. The linear motor mover 5 is made of permanent magnet material. After being powered on, the linear motor mover will first move horizontally along the linear rail 16 on the movable base plate 1, then turn along the arc-shaped rail 17, and then move upward along the linear rail 16 on the impact device bracket 2 to achieve a second acceleration movement, thereby impacting the bottom of the battery pack to be tested.

[0066] Everything else is the same as in Example 1.

[0067] It should be noted that the above-listed embodiments are merely a clear and complete description of the technical solution of this utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, not all of them. Furthermore, terms such as "upper," "lower," "front," "rear," and "middle" used in this specification are only for clarity of description and not intended to limit the scope of implementation of this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model. Simultaneously, the structures, proportions, sizes, etc., depicted in the accompanying drawings are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and purposes achieved by this utility model, should still fall within the scope of the technical content disclosed in this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0068] This invention replaces the impact ball drive method in the battery pack bottom ball impact test with a linear motor drive, thereby determining the speed and energy to impact a designated position. Compared with existing spring and pneumatic launching modes in the industry, it offers higher energy control precision, better repeatability, easier adjustment and control, and simpler operation. It has the following advantages:

[0069] 1. A linear motor is used to accelerate and impact the workpiece, delivering energy to a designated location at a set speed. This method offers high energy precision and, compared to other methods in the industry such as springs and pneumatic launchers, provides more accurate control for bottom impact testing.

[0070] 2. A linear motor is used as the drive device for the impact ball head, which is easy to adjust and control. By adjusting the voltage or frequency, or changing the secondary material, different speeds and electromagnetic thrusts can be obtained, accurately measuring the actual speed before impact with high accuracy. Suitable for various testing conditions.

[0071] 3. The battery bottom test is carried out by electromagnetic catapult using a linear motor, which has high acceleration. This is a significant advantage of linear motor drive compared to other cylinders, hydraulic cylinders, or lead screw, synchronous belt and gear rack drive.

[0072] 4. The use of dual-rail impact operation, consisting of a linear motor stator track and an impact track, can effectively reduce the direct impact of the impact force on the linear stator track and prevent damage to the linear motor stator track.

[0073] 5. The linear motor track adopts a composite magnetic track, which can effectively reduce the required height of the test device and reduce the overall space of the bottom test device through secondary acceleration.

Claims

1. A mobile power battery pack bottom ball impact test device, comprising a mobile base plate, an impact device bracket, an impact device drive component, and an impact ball head, wherein the impact device bracket is mounted on the mobile base plate, and the impact device drive component is mounted on the impact device bracket; characterized in that: The impact device drive component is a linear motor drive component powered by a linear motor. The linear motor drive component is mounted on the impact device bracket, and the impact ball head is mounted on the head of the linear motor drive component. The linear motor drives the impact ball head to move up and down.

2. The mobile power battery pack bottom ball impact test device according to claim 1, characterized in that: The linear motor drive component includes a linear motor stator track and a linear motor mover. The linear motor stator track is vertically mounted on the impact device bracket, and the linear motor mover is tightly fastened to the linear motor stator track. The impact ball head is mounted on the linear motor mover and moves up and down with the linear motor mover.

3. The mobile power battery pack bottom ball impact test device according to claim 1, characterized in that: The impact device support is a tower structure, which is mounted on a movable base plate and is a movable structure. A drive component mounting back plate is provided in the middle of the tower structure, and the linear motor stator rail is mounted on the drive component mounting back plate.

4. The mobile power battery pack bottom ball impact test device according to claim 2 or 3, characterized in that: The linear motor stator track is composed of multiple linear stator coils arranged sequentially from bottom to top along the drive component mounting back plate, and each linear stator coil is fixed to the drive component mounting back plate by fasteners.

5. The mobile power battery pack bottom ball impact test device according to claim 2, characterized in that: An impact ball head connecting plate is installed on the upper surface of the linear motor mover, and an impact ball head connecting support is installed on the upper surface of the impact ball head connecting plate. The impact ball head is fixedly installed on the impact ball head connecting support and moves up and down together with the linear motor mover.

6. The mobile power battery pack bottom ball impact test device according to claim 4, characterized in that: The impact ball head has a fixed flange at its bottom, and the impact ball head is installed on the top surface of the impact ball head connecting support through the fixed flange, so that the impact ball head faces upward.

7. The mobile power battery pack bottom ball impact test device according to claim 3, characterized in that: The drive component mounting back plate is provided with an impact rail parallel to the linear motor stator track. An impact slider is provided on the impact rail and is connected to the impact ball head connecting plate by fasteners. The impact slider moves up and down with the linear motor mover. The bottom of the movable base plate is provided with casters and a fixed support rod. The ball impact test device at the bottom of the movable power battery pack moves by the casters and is locked in place by the fixed support rod after it moves into position.

8. The mobile power battery pack bottom ball impact test device according to claim 3, characterized in that: The linear motor stator track is a linear rail, which extends from the top of the impact device bracket to the bottom of the impact device bracket, and the linear motor mover is fastened to the side of the linear motor stator track.

9. The mobile power battery pack bottom ball impact test device according to claim 3, characterized in that: The linear motor stator track is a composite track combining straight lines and arcs, consisting of a straight rail and an arc rail, forming a composite track with a combination of arc and straight lines.

10. The mobile power battery pack bottom ball impact test device according to claim 9, characterized in that: The composite track comprises two straight rails and one curved rail. The two straight rails are connected by the curved rail to form a composite track. One section is a vertical straight rail, which is arranged on the side of the impact device support from the top to the bottom. The other section is a horizontal straight rail, which is arranged horizontally on the bottom platform of the impact device support. The two straight rails are connected by the curved rail to form a composite track combining straight lines and curves. The mover of the linear motor is mounted on the composite track. After being powered on, the mover of the linear motor first undergoes initial acceleration through the horizontal straight rail of the composite track, and then turns through the curved rail, changing from horizontal motion to vertical upward motion. It then undergoes secondary acceleration through the vertical straight rail, moving upward in a straight line from the bottom of the impact device support, driving the impact ball to impact the bottom of the battery pack under test, thus conducting a ball impact test on the bottom of the battery pack.

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