Battery cell impact testing device

Abstract

The utility model provides a kind of electric core impact testing device, comprising: machine body;Impact part, liftable is set on machine body, with the hemisphere surface for contacting measured electric core, downward protruding;Pressure sensor, set on the machine body below impact part, can carry measured electric core;When impact part falls and impacts measured electric core under the action of its gravity, pressure sensor can collect pressure information.The electric core impact testing device of the utility model, impact part falls under gravity, the speed when impacting measured electric core is controllable, can simulate the speed of external object impacting vehicle;The hemisphere surface of impact part can simulate the ball head invasion of external object to electric core, with controllable maximum stress point, so that the pressure information collected by pressure sensor is more reliable.

Description

Technical Field

[0001] This utility model relates to the field of testing device technology, and in particular to a battery cell impact testing device. Background Technology

[0002] From cars to battery packs to battery cells, industry professionals break down and verify each layer. As a core component of automobiles, the safety of battery cells in collisions is crucial to the safe use of the entire vehicle.

[0003] Currently, safety testing at the battery cell level primarily uses compression tests to replace the deformation that occurs after a car is hit. Compression tests can monitor the force and displacement experienced by the battery cell during compression. However, because the compression speed of the battery cell during compression tests is too low, it differs significantly from the high-speed collision test conditions used in automobiles and cannot fully simulate the impact on the battery cell during a car collision. Utility Model Content

[0004] In view of this, the present invention aims to provide a battery cell impact testing device to simulate the impact of a battery cell when it is hit by a car.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A battery cell impact testing device, comprising:

[0007] Organism;

[0008] The impact part is mounted on the machine body in a height-adjustable manner and has a downwardly protruding hemispherical surface for contacting the battery cell under test;

[0009] A pressure sensor is mounted on the body below the impact section and is capable of supporting the battery cell under test.

[0010] When the impacting part falls and impacts the tested battery cell under its own gravity, the pressure sensor can collect pressure information.

[0011] Furthermore, the pressure sensor is covered with a protective plate on top, and the battery cell under test is placed on the protective plate.

[0012] Furthermore, the body has a vertically extending guide portion, the impact portion is fixedly connected to a limiting portion, and the limiting portion is slidably connected to the guide portion along the extending direction of the guide portion.

[0013] Furthermore, the guiding part is a guide rod, the limiting part is a linear bearing, and the guide rod passes through the linear bearing.

[0014] Furthermore, the impact section includes a carrier, an impact head, and a counterweight.

[0015] The impact head is detachably connected to the bottom end of the carrier for contacting the battery cell under test, and the counterweight is detachably connected to the top end of the carrier.

[0016] Furthermore, the counterweight includes at least one counterweight body;

[0017] When multiple counterweights are configured, they are stacked vertically together.

[0018] Furthermore, the body is provided with a lifting section, which has a free end that is detachably connected to the impact part. The free end is capable of lifting the impact part and releasing it from a predetermined height.

[0019] Furthermore, the lifting unit includes a winch and an electric gripper;

[0020] The electric gripper is fixed to the traction end of the winch and is capable of gripping and releasing the impact part.

[0021] Furthermore, it includes an image acquisition component, which is capable of acquiring image information when the impactor impacts the tested battery cell.

[0022] Furthermore, the image acquisition component includes a high-speed camera and a light source, the light source illuminating the tested battery cell, and a reference point is provided on the hemispherical surface of the impact portion.

[0023] Compared with the prior art, this utility model has the following advantages:

[0024] The battery cell impact testing device of this utility model has an impact part that falls under gravity, and the speed at which it impacts the battery cell under test is controllable, which can simulate the speed at which an external object impacts a vehicle; the hemispherical surface of the impact part can simulate the intrusion of an external object into the ball head of the battery cell, and has a controllable maximum force point, making the pressure information collected by the pressure sensor more reliable.

[0025] Setting up a protective plate can distribute the impact force more evenly to the pressure sensor when the tested battery cell is subjected to an impact. This can effectively reduce the damage to the pressure sensor caused by the impact of the tested battery cell and improve the service life of the pressure sensor.

[0026] By setting up a guide and a limiting part, the impact part can be guided to impact the battery cell under test in a vertical direction. The impact part is not easy to deviate or deflect during the fall, which can reduce test errors and improve test accuracy.

[0027] By designing the guide part as a guide rod and the limiting part as a linear bearing, the friction between the two is reduced, and the impact part experiences less speed loss during the descent, thus obtaining more accurate test results.

[0028] The impact head is detachably connected to the carrier, making it easy to replace when it is deformed or damaged. Other shapes of impact heads can also be used, improving the applicability of the cell impact testing device. The counterweight can be set as needed to simulate more external impact scenarios.

[0029] The stacking of multiple counterweights allows for better control of the overall center of gravity of the impact section, resulting in a more stable descent and a better simulated impact effect.

[0030] The lifting section can be set up to raise the impact section to different heights for release, simulating external impact scenarios at different speeds.

[0031] The winch has a compact structure and runs smoothly. It can respond quickly to operating commands and has high work efficiency. When used with electric grippers, it can quickly lift and release the impact part.

[0032] The image acquisition component can acquire images of the tested battery cell when it is impacted. By monitoring the displacement data during the battery cell collision process, not only can the actual displacement (intrusion amount) of the intrusion be obtained, but also the degree of deformation at different positions of the tested battery cell at the same speed can be compared to understand the overall structural strength of the tested battery cell.

[0033] Setting a light source can increase the brightness of the impact area and improve image clarity; setting a reference point can facilitate the calculation of the displacement of the impact area and obtain the displacement of the reference point at each time. Attached Figure Description

[0034] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0035] Figure 1 This is a schematic diagram of the overall structure of the battery cell impact testing device described in this embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the structure of the battery cell impact testing device according to an embodiment of the present invention after the image acquisition component is hidden.

[0037] Explanation of reference numerals in the attached figures:

[0038] 1. Organism;

[0039] 101. Guidance Department;

[0040] 2. Impact zone;

[0041] 201. Carrier; 202. Impact head; 203. Counterweight; 2031. Counterweight body; 204. Reference point;

[0042] 3. Pressure sensor;

[0043] 4. Protective panels;

[0044] 5. Limiting part;

[0045] 6. Improvement Department;

[0046] 601. Winch; 602. Electric gripper;

[0047] 7. Image acquisition component;

[0048] 701. High-speed camera; 702. Light source;

[0049] 8. The battery cell under test. Detailed Implementation

[0050] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0051] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" appear, indicating orientation or positional relationship, they are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, if terms such as "first" or "second" appear, they are also used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] Furthermore, in the description of this utility model, unless otherwise explicitly defined, the terms "installation," "connection," "joining," and "connector" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model in light of the specific circumstances.

[0053] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0054] This embodiment relates to a battery cell impact testing device to simulate the impact of a battery cell when it is hit by a car.

[0055] In terms of overall structure, the battery cell impact testing device in this embodiment includes a main body, an impact unit, and a pressure sensor. The impact unit is vertically mounted on the main body and has a downwardly convex hemispherical surface for contacting the battery cell under test. The pressure sensor is located on the main body below the impact unit and can support the battery cell under test. When the impact unit falls and impacts the battery cell under test under its own weight, the pressure sensor can collect pressure information.

[0056] As configured above, in this embodiment of the battery cell impact testing device, the impact part falls under gravity, and the speed at which it impacts the battery cell under test is controllable, simulating the speed at which an external object impacts a vehicle. The hemispherical surface of the impact part can simulate the intrusion of an external object into the ball head of the battery cell, and has a controllable maximum force point, making the pressure information collected by the pressure sensor more reliable and the simulation scenario more accurate.

[0057] Based on the above overview, refer to Figure 1 and Figure 2 As shown, specifically, the battery cell 8 under test can be a square cell, a blade cell, or a cylindrical cell. When placing the cell, the side to be tested for impact should face the impact part 2. The main body 1 has a rectangular frame structure, and the pressure sensor 3 is located at the bottom inside the main body 1. A piezoelectric pressure sensor 3 can be used. The pressure sensor 3 can be connected to a computer to transmit the collected pressure information to the computer for analysis.

[0058] In this embodiment, a protective plate 4 covers the top of the pressure sensor 3 to protect it, and the tested battery cell 8 is placed on the protective plate 4. The protective plate 4 allows for a more even distribution of impact force when the tested battery cell 8 is subjected to impact, thus reducing the damage to the pressure sensor 3 and extending its service life. The protective plate 4 is larger than both the tested battery cell 8 and the pressure sensor 3, providing better protection for the pressure sensor 3. In this embodiment, the protective plate 4 is made of aluminum.

[0059] Secondly, the body 1 has a vertically extending guide section 101, and the impact section 2 is fixedly connected to a limiting section 5. The limiting section 5 is slidably connected to the guide section 101 along its extension direction. By setting the guide section 101 and the limiting section 5, the impact section 2 can be guided to impact the tested battery cell 8 in a vertical direction. The impact section 2 is less likely to deviate or turn during its fall, which can reduce test errors and improve test accuracy. The impact section 2 has a large mass and high inertia. It is guided by gravity during its fall and has a certain horizontal anti-deviation capability. The guide section 101 is a secondary anti-deviation structure for the impact section 2 to further enhance the positional accuracy of the impact section 2 when impacting the battery cell 8.

[0060] Specifically, the guide part 101 is a guide rod, and the limiting part 5 is a linear bearing, with the guide rod passing through the linear bearing. By setting the guide part 101 as a guide rod and the limiting part 5 as a linear bearing, the friction between the two is small, the impact part 2 experiences less speed loss during the falling motion, and more accurate test results can be obtained.

[0061] It is understandable that the guide part 101 and the limiting part 5 can also be a combination of other structures, such as the guide part 101 being a slide rail and the limiting part 5 being a slider, which can also play a guiding role for the impact part 2, but the friction is relatively large compared to the structure of the guide rod and linear bearing in this embodiment.

[0062] Furthermore, the impact unit 2 in this embodiment includes a carrier 201, an impact head 202, and a counterweight 203. The impact head 202 is detachably connected to the bottom end of the carrier 201 for contacting the battery cell 8 under test; that is, the aforementioned hemispherical surface is located at the bottom of the impact head 202. The counterweight 203 is detachably connected to the top end of the carrier 201. The detachable connection of the impact head 202 to the carrier 201 allows for easy replacement if the impact head 202 is deformed or damaged. It also allows for the use of impact heads of other shapes if needed, improving the applicability of the battery cell impact testing device. The counterweight 203 can be adjusted in weight as needed to simulate more external impact scenarios.

[0063] Specifically, in this embodiment, the carrier 201 is a double-layer rectangular frame structure with four vertical guide rods that pass through the four corners of the carrier 201. Linear bearings are bolted to the carrier 201, acting as a barrier between the guide rods and the carrier 201. A hanging ring is located at the top of the upper layer of the carrier 201, and a counterweight 203 is located on the lower layer of the carrier 201, connected to the carrier 201 by bolts.

[0064] Furthermore, the counterweight 203 includes at least one counterweight body 2031. When multiple counterweight bodies 2031 are configured, they are stacked vertically. In this embodiment, there are two counterweight bodies 2031, which are threadedly connected to the carrier 201 using bolts, pressing the counterweight bodies 2031 firmly onto the carrier 201. Stacking multiple counterweight bodies 2031 allows for better control of the overall center of gravity of the impact part 2, making the impact part 2 fall more smoothly and simulating a better impact effect. Of course, the counterweight bodies 2031 can also be stacked in other ways, as long as the center of gravity of the impact part 2 can be controlled on the central axis of the impact head 202.

[0065] Furthermore, the body 1 is equipped with a lifting section 6, which has a free end detachably connected to the impact section 2. The free end can lift the impact section 2 and release it from a predetermined height. The lifting section 6 allows the impact section 2 to be lifted to different heights for release, simulating external impact scenarios at different speeds. Before testing, based on v = √2gh and h = v² / 2g, different impact speeds are achieved by adjusting the distance between the impact head 202 and the tested battery cell 8.

[0066] Specifically, the lifting unit 6 includes a winch 601 and an electric gripper 602. The electric gripper 602 is fixed to the traction end of the winch 601 and can grip and release the impact part 2. The winch 601 has a compact structure and runs smoothly, can quickly respond to operating commands, and has high working efficiency. Together with the electric gripper 602, it can quickly lift and release the impact part 2. Of course, the lifting unit 6 can also adopt a structure of ball screw combined with electric gripper 602, or winch 601 combined with battery iron, as long as it can lift the impact part 2 to a predetermined height and release it.

[0067] In addition, the battery cell impact testing device also includes an image acquisition component 7, which can acquire image information when the impactor 2 impacts the battery cell 8 under test. The image acquisition component 7 can acquire images of the battery cell 8 under test when it is impacted. By monitoring the displacement data during the battery cell collision process, not only can the actual displacement (intrusion amount) of the intrusion be obtained, but also the degree of deformation at different positions of the battery cell at the same speed can be compared to understand the overall structural strength of the battery cell.

[0068] Specifically, the image acquisition component 7 includes a high-speed camera 701 and a light source 702. The light source 702 illuminates the battery cell 8 under test, and a reference point 204 is provided on the hemispherical surface of the impact part 2. The light source 702 enhances the brightness of the impact part 2 and improves image clarity. In this embodiment, two light sources 702 are provided, illuminating the battery cell 8 from both sides of the high-speed camera 701, with the illumination center aligned with the battery cell 8. The reference point 204 facilitates the calculation of the displacement of the impact part 2 in the image, obtaining the displacement of the reference point at each moment. The reference point can be attached to the impact head 202, engraved on the surface of the hemispherical surface, or marked with paint; all these methods serve to mark the same position on the impact head 202. The image information acquired by the high-speed camera 701 can also be transmitted to a computer for researchers to conduct multi-dimensional evaluations of the battery cell 8 in conjunction with the pressure data collected by the pressure sensor 3.

[0069] In this embodiment of the battery cell impact testing device, the impact part 2 falls under gravity, and the speed at which it impacts the battery cell 8 under test is controllable. It can simulate the speed at which an external object impacts a vehicle. The hemispherical surface of the impact part 2 can simulate the intrusion of an external object into the battery cell, and it has a controllable maximum force point, making the pressure information collected by the pressure sensor 3 more reliable. The image acquisition component 7 can acquire images of the battery cell 8 under test when it is impacted, understand the degree of deformation at different locations of the battery cell 8 under test, and then analyze the overall structural strength of the battery cell 8 under test.

[0070] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A battery cell impact testing device, characterized in that, include: Organism; The impact part is mounted on the machine body in a height-adjustable manner and has a downwardly protruding hemispherical surface for contacting the battery cell under test; A pressure sensor is mounted on the body below the impact section and is capable of supporting the battery cell under test. When the impacting part falls and impacts the tested battery cell under its own gravity, the pressure sensor can collect pressure information. The pressure sensor is covered by a protective plate, and the battery cell under test is placed on the protective plate. The size of the protective plate is larger than that of the battery cell under test and the pressure sensor. An image acquisition component, which is capable of acquiring image information when the impactor impacts the tested battery cell; The hemispherical surface of the impact part is provided with a reference point, which is either pasted on the hemispherical surface, or engraved on the hemispherical surface, or coated with paint.

2. The cell impact testing device according to claim 1, characterized in that: The body has a vertically extending guide portion, the impact portion is fixedly connected to a limiting portion, and the limiting portion is slidably connected to the guide portion along the extending direction of the guide portion.

3. The cell impact testing device according to claim 2, characterized in that: The guiding part is a guide rod, the limiting part is a linear bearing, and the guide rod passes through the linear bearing.

4. The cell impact testing device according to claim 1, characterized in that: The impact section includes a carrier, an impact head, and a counterweight. The impact head is detachably connected to the bottom end of the carrier for contacting the battery cell under test, and the counterweight is detachably connected to the top end of the carrier.

5. The cell impact testing device according to claim 4, characterized in that: The counterweight includes at least one counterweight body; When multiple counterweights are configured, they are stacked vertically together.

6. The cell impact testing device according to claim 1, characterized in that: The body is provided with a lifting part, which has a free end that is detachably connected to the impact part. The free end can lift the impact part and release it from a predetermined height.

7. The cell impact testing device according to claim 6, characterized in that: The lifting unit includes a winch and an electric gripper; The electric gripper is fixed to the traction end of the winch and is capable of gripping and releasing the impact part.

8. The cell impact testing device according to any one of claims 1-7, characterized in that: The image acquisition component includes a high-speed camera and a light source, the light source being directed toward the battery cell under test.

Images