Auxiliary device for battery performance test
By designing a battery performance testing device with a rotatable turntable structure and a conductive slip ring, the problem of low battery charging and discharging efficiency in synchrotron radiation in-situ testing was solved, enabling continuous in-situ testing of multiple samples and improving machine time utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHONGQING INNOVATION CENTER OF BEIJING INSTITUTE OF TECHNOLOGY
- Filing Date
- 2025-06-11
- Publication Date
- 2026-05-15
AI Technical Summary
Current in-situ synchrotron radiation testing methods suffer from low battery charge-discharge efficiency, long single-cell testing cycles, and low utilization of machine time resources, making it difficult to meet the testing requirements of multiple materials and conditions.
Design an auxiliary device for battery performance testing. It adopts a rotatable turntable structure, with multiple perforated button batteries fixed on the turntable. Mechanical support and electrical connection are achieved through clamps, and accurate alignment is ensured by a positioning structure. Conductive slip rings ensure continuous conductivity between the electrodes and the external system, enabling continuous in-situ testing of multiple samples.
It significantly improves the utilization rate of synchrotron radiation equipment, enables continuous in-situ testing of multiple samples, enhances testing efficiency, and is suitable for synchrotron radiation experiments with various transmission modes.
Smart Images
Figure CN224247782U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of batteries, and more specifically to an auxiliary device for battery performance testing. Background Technology
[0002] In recent years, with the continuous development of new energy materials, especially novel lithium-ion battery cathode materials (such as lithium-rich manganese-based materials, rock salt structure materials, and lithium iron phosphate materials), the demand for research on the subtle structural changes of batteries during charging and discharging has been increasing. Among these, various synchrotron radiation experiments conducted in transmission mode (including but not limited to X-ray absorption spectroscopy (XAS), X-ray diffraction (XRD), and X-ray emission spectroscopy (XES)) are widely used in in-situ, quasi-in-situ, and operating condition material characterization studies due to their good data quantification and high signal-to-noise ratio.
[0003] In practical transmission tests, open-cell button batteries (characterized by holes in the stainless steel casing outside the positive and negative electrodes, sealed with polyimide film and AB glue, allowing test light to pass through the positive and negative electrodes, electrolyte, and membrane) have become the most commonly used battery design for in-situ synchrotron radiation testing due to their inherent advantages. To comprehensively capture the minute structural changes during the electrochemical reaction process, low-rate charge-discharge (e.g., C / 10 to C / 20) is typically used during testing to ensure the complete unfolding of the battery reaction kinetics and avoid reaction jumps or omissions caused by high rates.
[0004] However, there are significant efficiency bottlenecks in existing synchrotron radiation in-situ testing processes: single-cell testing cycles are long, typically requiring more than 20 hours; synchrotron radiation time resources are scarce, making it difficult to cover the testing needs of multiple materials and conditions; although the battery charging and discharging process is lengthy, the actual synchrotron radiation time occupied by the sampling operation is extremely short (usually sampling once every 10 minutes, each time requiring only 2 minutes), resulting in a large amount of valuable time resources being idle and low testing efficiency. Utility Model Content
[0005] The purpose of this invention is to overcome the problem of low efficiency in low-rate charge-discharge testing in the existing technology, and to provide an auxiliary device for battery performance testing. This device can assist in the rotational testing of multiple batteries, significantly improve the utilization rate of testing time, and realize continuous in-situ testing of multiple samples.
[0006] To achieve the above objectives, the first aspect of this utility model provides an auxiliary device for battery performance testing, wherein the device includes a rotatable turntable connected to a driving component, and n sampling points are uniformly arranged along its circumference on the turntable, where n≥2, and each sampling point has a circular light-transmitting hole. A clamp is provided on the turntable on one side of the sampling point, the clamp being used to hold the sample to be tested, and the clamp being provided with a conductive component for electrical connection with the sample to be tested.
[0007] Using the above technical solution, multiple test samples (hereinafter referred to as open-cell button batteries) are fixed on a turntable using a special fixture, achieving reliable mechanical support and electrical connection. The fixture structure is adaptable to various sizes and specifications of open-cell button batteries, exhibiting good compatibility and facilitating flexible testing of different battery systems.
[0008] Preferably, the device further includes a positioning structure, which keeps the turntable at the preset angle position when the turntable rotates to a preset angle.
[0009] Generally, a stepper motor with a control board can be selected as the driving component to control the rotation angle of the turntable. The limiting structure can keep the motor at the sampling position so that the sampling optical path can be accurately aligned with each rotation, avoiding sampling deviation caused by accumulated errors.
[0010] Preferably, the positioning structure includes a positioning groove and a positioning post, one of which is located on the turntable and the other is located on the support structure. A positioning groove or positioning post is respectively provided on the turntable for each sampling point.
[0011] The positioning post includes a post body with a cavity inside. A spring and a positioning protrusion are provided in the cavity. One end of the spring is pressed against the bottom of the cavity, and the other end is pressed against the positioning protrusion. A through hole is provided on the post body corresponding to the positioning groove. A part of the positioning protrusion extends outward from the through hole to form a positioning protrusion head, which falls into the corresponding positioning groove.
[0012] With this structure, the opening of the positioning groove can be a smooth arc surface, facilitating the entry and exit of the positioning protrusion. Accurate positioning can be achieved through the cooperation of the positioning groove and the positioning protrusion.
[0013] Preferably, the clamp has two opposing clamping surfaces, and metal sheets are respectively disposed on the two opposing clamping surfaces, the metal sheets forming the conductive element;
[0014] The metal sheet is provided with anti-slip texture.
[0015] With this structure, the clamp is designed as a double-sided clamp, which makes reliable contact with the positive and negative edges of the battery respectively. The anti-slip texture makes the clamp hold the sample to be tested more firmly.
[0016] Preferably, the turntable has a sampling groove, which forms the sampling point, and the bottom of the sampling groove has a light-transmitting hole;
[0017] A clamping slot is provided on the turntable outside the sampling slot. The clamping slot is connected to the sampling slot, and the clamp is installed in the clamping slot.
[0018] Preferably, the device further includes a conductive slip ring, and a connecting shaft is provided on the surface of the turntable opposite to the sampling point. This connecting shaft is connected to the mover of the conductive slip ring, and the output shaft of the drive unit is connected to the mover of the conductive slip ring. With this structure, the conductive slip ring enables continuous conduction between the electrodes of the sample under test and the external constant current charge-discharge system during rotation.
[0019] Preferably, a buckle is provided on the turntable for each sampling point, and the buckle is used to fix the power cord of the corresponding sample to be tested. This structure facilitates fixing the power cord of the sample to be tested, prevents the wire from shaking or tangling during rotation, and connects the wire to the corresponding electrical channel of the slip ring mover after orderly bundling.
[0020] Preferably, the anti-slip texture includes alternating concave and convex portions, wherein the convex portions form a contact surface with the sample to be tested, and the surface of the convex portions is planar. This structure, with its alternating concave and convex portions and the planar shape of the convex portions of the anti-slip texture, ensures a consistently secure and reliable grip on the sample to be tested.
[0021] The second aspect of this invention provides a method for testing multi-channel electrochemical in-situ cells, wherein the testing is performed based on the apparatus described in the first aspect of this invention, and the method includes:
[0022] S1, using the clamp to hold one sample to be tested respectively, the positive and negative poles of each sample to be tested are in contact with the corresponding conductive component, and the opening on each sample to be tested is aligned with the corresponding light-transmitting hole, and one of the samples to be tested is located at the sampling position;
[0023] S2, connect the conductive components corresponding to each of the test samples to the charging and discharging device respectively;
[0024] S3, using the testing device to acquire test data of the sample to be tested located at the sampling position, after a preset time interval, using the driving component to drive the turntable to rotate the next sample to be tested to the sampling position at a preset angle, and again using the testing device to acquire test data of the sample to be tested located at the sampling position.
[0025] S4. Repeat step S3 until sampling of all the samples to be tested is completed.
[0026] Using the above method, the button cell to be tested rotates with the turntable. Once the cell to be sampled has rotated to the fixed sampling position, the turntable stops rotating, completing the sampling. After one sampling is completed, the turntable continues to rotate according to the set program, moving the next cell to the sampling position. This process is repeated, enabling timed sampling and automatic rotation of cells under low-rate charging and discharging, significantly improving the utilization rate of the synchrotron radiation facility, while ensuring the continuity of the charging and discharging process of each cell and the integrity of the structural evolution data.
[0027] By using the above technical solution, multiple perforated button batteries (samples to be tested) are mounted on a rotatable disk, allowing each battery to be moved to a fixed sampling position in turn during low-rate charging and discharging, thereby significantly improving the utilization rate of the testing time and realizing continuous in-situ testing of multiple samples.
[0028] This invention is applicable to all synchrotron radiation experiments based on transmission modes, such as X-ray absorption spectroscopy (XAS), X-ray diffraction (XRD), and X-ray emission spectroscopy (XES). It has the advantages of simple structure, strong adaptability, flexible control, portability and high efficiency.
[0029] Preferably, after each sampling of the sample to be tested is completed, the charging and discharging device is used to continue charging and discharging the sample to be tested according to a preset program. When the preset test time is reached, S3 and S4 are repeated.
[0030] Compared with the prior art, the present invention has the following advantages: by installing multiple perforated button batteries on a motor-driven turntable, each battery can be moved to a fixed sampling position in turn according to a set time sequence during low-rate charging and discharging to perform synchronous radiation transmission sampling, which significantly improves the utilization rate of the machine time and realizes continuous in-situ testing of multiple samples.
[0031] This invention is applicable to all synchrotron radiation experiments based on transmission modes, such as X-ray absorption spectroscopy (XAS), X-ray diffraction (XRD), and X-ray emission spectroscopy (XES). It has the advantages of simple structure, strong adaptability, flexible control, portability and high efficiency. Attached Figure Description
[0032] Figure 1This is a three-dimensional structural diagram of the clamping device from a first-person perspective;
[0033] Figure 2 This is a schematic diagram of the three-dimensional structure of the turntable;
[0034] Figure 3 This is a schematic diagram of the turntable's planar structure;
[0035] Figure 4 This is a schematic diagram of the three-dimensional structure from a second-person perspective;
[0036] Figure 5 yes Figure 1 Enlarged view of part a;
[0037] Figure 6 yes Figure 5 Enlarged view of part b in the middle;
[0038] Figure 7 This is a structural diagram of the positioning column.
[0039] Explanation of reference numerals in the attached figures
[0040] 1-Turntable; 2-Light-passing hole; 3-Clamp; 4-Positioning structure; 4a-Positioning groove; 4b-Positioning post; 4b1-Post body; 4b2-Spring; 4b3-Cavity; 4b4-Positioning protrusion; 4b5-Through hole; 4b6-Positioning protrusion; 5-Anti-slip texture; 6-Sampling slot; 7-Clamping slot; 8-Conductive slip ring; 9-Connecting shaft; 10-Output shaft; 11-Snap-on; 12-Conductive component. Detailed Implementation
[0041] In the description of this application, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.
[0042] The terms “first”, “second”, etc. are used to distinguish similar objects, not to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein. The objects distinguished by “first”, “second”, etc. are usually of the same class and the number of objects is not limited. For example, the first object can be one or more.
[0043] Furthermore, the term "and / or" in the specification and claims is used to describe the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0044] In the description of this application, unless otherwise stated, "a plurality of" means two or more.
[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0046] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0047] The sampling position is the location where the testing device can sample data from the battery. Generally, the sampling position is directly below the optical path of the testing device so that the test light emitted by the testing device can pass smoothly through the opening on the sample to be tested. By analyzing the changes in the light signal before and after passing through the battery, the corresponding data of the battery can be analyzed.
[0048] In one embodiment, such as Figure 1-7 As shown, an auxiliary device for battery performance testing is provided. The device includes a rotatable turntable 1 connected to a driving component (not shown in the figure). The turntable 1 has n sampling points evenly arranged along its circumference, where n≥2. Each sampling point has a circular light-transmitting hole 2. A clamp 3 is provided on the turntable on one side of the sampling point. The clamp 3 is used to hold the sample to be tested. The clamp 3 is provided with a conductive component 12 for electrical connection with the sample to be tested.
[0049] Turntables are typically made of engineering plastics or composite materials to meet requirements for structural strength, resistance to electrolyte corrosion, and lightweight, while also reducing the risk of short circuits during the installation and removal of button batteries.
[0050] The driving component is usually a stepper motor, which is connected to a stepper motor driver board and a control board so that the single rotation angle of the motor and the preset interval can be changed according to the user's needs.
[0051] In some embodiments, a sampling groove 6 is provided on the turntable 1. The sampling groove 6 is circular and forms the sampling point. The light-transmitting hole 2 is provided at the bottom of the sampling groove 6. A clamping groove 7 is provided on the turntable 1 outside the sampling groove 6. The clamping groove 7 is connected to the sampling groove 6. The clamping fixture 3 is installed in the clamping groove 7.
[0052] In some embodiments, such as Figure 5 and 6 As shown, the clamp 3 has two opposing clamping surfaces, and metal sheets are respectively provided on the two opposing clamping surfaces. The metal sheets form the conductive element 12, and anti-slip textures 5 are provided on the metal sheets.
[0053] The anti-slip texture 5 includes alternating concave portions 5a and convex portions 5b, wherein the convex portion 5b forms a contact surface with the sample to be tested, and the surface of the convex portion 5b is planar.
[0054] In some embodiments, such as Figure 1 As shown, the device also includes a conductive slip ring 8. A connecting shaft 9 is provided on the surface of the turntable 1 opposite to the sampling point. The connecting shaft 9 is connected to the mover of the conductive slip ring 8. The output shaft 10 of the drive unit is connected to the mover of the conductive slip ring 8.
[0055] The purpose of setting the conductive slip ring is to ensure that the power lines remain orderly when the turntable 1 rotates. Therefore, the output shaft 10 of the motor can also be directly connected to the connecting shaft 9 to drive the turntable 1 to rotate. In this case, the power lines will rotate with the turntable. Alternatively, other methods can be used to keep the power lines orderly, but this is not the focus of this application and will not be elaborated here.
[0056] In some embodiments, such as Figure 3 As shown, a buckle 11 is provided on the turntable 1 for each of the sampling sites, and the buckle 11 is used to fix the power cord of the corresponding sample to be tested.
[0057] The position of clip 11 is not particularly limited, as long as it can secure the corresponding power cord. In this example, for instance... Figure 4As shown, the sampling point is located on the front of the turntable 1, and the buckle 11 is located on the back of the turntable 1. In this method, the power line connected to the positive and negative poles of the sample to be tested reaches the edge of the turntable 1 along the radial direction of the turntable 1, and then reaches the corresponding buckle 11 to be fixed. Then it continues to connect downward to the corresponding electrical channel of the moving part of the conductive slip ring 8, while the corresponding electrical channel of the stator part of the conductive slip ring is connected to the charging and discharging device.
[0058] In addition, the buckle 11 can also be set on the front of the turntable 1 near the sampling slot 6. The turntable 1 also has wire holes (not shown in the figure) corresponding to the buckle 11. In this way, the power line connected to the positive and negative poles of the sample to be tested is first fixed by the corresponding buckle 11. Then the power line passes through the corresponding wire hole and connects downward to the corresponding electrical channel of the moving part of the conductive slip ring 8. The corresponding electrical channel of the stator part of the conductive slip ring is connected to the charging and discharging device.
[0059] In some embodiments, at preset time intervals, the driving member drives the turntable 1 to rotate by a preset angle, wherein the preset angle is 360° / n.
[0060] The device also includes a positioning structure 4, which keeps the turntable 1 at the preset angle whenever the turntable 1 rotates to the preset angle position.
[0061] The positioning structure 4 includes a positioning groove 4a and a positioning post 4b, one of which is located on the turntable 1 and the other is located on the support structure (not shown in the figure). The turntable 1 is provided with a positioning groove 4a or a positioning post 4b corresponding to each sampling point.
[0062] In some embodiments, such as Figure 4 As shown, the positioning groove 4a is located on the back of the turntable 1, and the positioning post 4b is located on the support structure. The back of the turntable 1 is provided with a positioning groove 4a for each sampling point.
[0063] In some embodiments, the positioning post 4b includes a post body 4b1, which has a cavity 4b3. A spring 4b2 and a positioning protrusion 4b4 are disposed in the cavity 4b3. One end of the spring 4b2 abuts against the bottom of the cavity 4b3, and the other end abuts against the positioning protrusion 4b4. A through hole 4b5 is provided on the post body 4b1 corresponding to the positioning groove 4a. A portion of the positioning protrusion 4b4 extends outward from the through hole 4b5 to form a positioning protrusion 4b6. During testing, the positioning protrusion falls into the corresponding positioning groove 4a.
[0064] When the drive unit is activated, the torque provided by the drive unit overcomes the force provided by the spring 4b2, and the turntable 1 rotates, causing the positioning protrusion 4b6 to slide out of the positioning groove 4a and release the positioning. When the next sample to be tested rotates to the sampling position, the positioning protrusion 4b6 slides into the positioning groove 4a corresponding to the next sample to be tested, thereby achieving positioning. As the turntable 1 continues to rotate, the positioning protrusion 4b6 continuously engages with the positioning groove 4a corresponding to each sample to be tested, thereby achieving positioning.
[0065] In some embodiments, a multichannel electrochemical in-situ cell testing method is provided, based on the aforementioned apparatus, the method comprising:
[0066] S1, the clamps 3 hold one sample to be tested (open-hole button battery) respectively, the positive and negative terminals of each sample to be tested are in contact with the corresponding conductive element 12, and the openings on each sample to be tested are aligned with the corresponding light-transmitting holes 2, and one of the samples to be tested is located at the sampling position.
[0067] The test sample can be a battery that has been left to stand for more than 12 hours to ensure that the open circuit voltage is normal.
[0068] In this example, n is 6, meaning that the device can hold 6 open-hole button batteries. The positive and negative edges of the 6 open-hole button batteries are respectively held by the corresponding clamps 3 and in contact with the corresponding conductive parts 12. The center line of the light-transmitting hole 2 coincides with the center line of the corresponding hole on the sample to be tested.
[0069] The positioning protrusion 4b6 falls into the positioning groove 4a corresponding to the sample to be tested at the sampling position, thereby realizing the positioning of the sample to be tested at that position.
[0070] S2, the conductive components 12 corresponding to each of the test samples are electrically connected to the charging and discharging device. The charging and discharging device is a constant current charging and discharging device, thus, the battery under test can be charged and discharged using the constant current charging and discharging device.
[0071] S3, using the testing device to acquire test data of the sample to be tested located at the sampling position, after a preset time interval, using the driving component to drive the turntable to rotate the next sample to be tested to the sampling position at a preset angle, and again using the testing device to acquire test data of the sample to be tested located at the sampling position.
[0072] The charging and discharging device is typically a constant current charging and discharging device (brands such as Lanhe or Xinwei), and the testing device is a synchrotron radiation testing device. During sampling, the light emitted by this synchrotron radiation testing device passes through the hole in the button cell and is received after passing through the sample under test. By analyzing the changes in light information before and after sampling, the corresponding data of the sample under test can be obtained. In this example, the preset interval time is 60 seconds.
[0073] Generally, after the preset interval is reached, the test light source can be paused for 15 seconds, during which the drive unit is controlled to rotate the turntable 1, and then the light source can be turned on again to sample the next button battery with an opening. That is, the next sample is sampled every 75 seconds.
[0074] S4. Repeat step S3 until sampling of all the samples to be tested is completed. One round of sampling of all samples is completed after turntable 1 rotates once.
[0075] In some embodiments, the method further includes: after each sampling of the sample to be tested is completed, the charging and discharging device is used to continue charging and discharging the sample to be tested according to a preset program, and when the preset test time is reached, S3 and S4 are repeated.
[0076] The preset program uses different charging and discharging programs for different battery tests. The program can be selected according to the actual test requirements. This is an existing technology in the field and will not be described in detail here.
[0077] That is, after each open-hole button cell under test completes one data acquisition, it enters the constant current charge-discharge stage. When the constant current charge-discharge time is sufficient and data acquisition is required again, S3 and S4 are repeated to complete a new round of sampling for all samples. If the turntable 1 is continuously rotated to collect data without interruption, the interval between two test data of the same open-hole button cell under test is 75s × 6 = 450s.
[0078] Repeat this step until the constant current charge and discharge of all the open-hole button cells to be tested meets the test requirements, thus obtaining data acquisition for all the open-hole button cells to be tested.
[0079] In addition, after completing one round of data sampling for all samples, the system can enter a continuous constant current charge-discharge phase for a time of T s. When sampling is required, S3 and S4 are repeated to complete a new round of sampling for all samples. At this time, the interval between two test data of the same open-hole button battery to be tested is (75×6+T)s.
[0080] The method provided by this utility model allows each battery to maintain a continuous electrical connection with an external constant current charging and discharging device through a conductive slip ring while data is being collected from the battery, without interrupting the charging and discharging process. Furthermore, multiple samples can be tested at once, which greatly improves the utilization rate of the test time and increases the testing efficiency.
[0081] The preferred embodiments of this utility model have been described in detail above; however, this utility model is not limited thereto. Within the scope of the technical concept of this utility model, various simple modifications can be made to the technical solution of this utility model, including combining the various technical features in any other suitable manner. These simple modifications and combinations should also be considered as the content disclosed by this utility model and are all within the protection scope of this utility model.
Claims
1. An auxiliary device for battery performance testing, characterized in that, The device includes a rotatable turntable connected to a driving component. The turntable has n sampling points evenly arranged along its circumference, where n≥2. Each sampling point has a circular light-transmitting hole. A clamp is provided on the turntable on one side of the sampling point. The clamp is used to hold the sample to be tested and is provided with a conductive component for electrical connection with the sample to be tested.
2. The apparatus according to claim 1, characterized in that, The device also includes a positioning structure, which keeps the turntable at the preset angle position when the turntable rotates to a preset angle.
3. The apparatus according to claim 2, characterized in that, The positioning structure includes a positioning groove and a positioning post, one of which is located on the turntable and the other is located on the support structure. A positioning groove or positioning post is provided on the turntable for each sampling point. The positioning post includes a post body with a cavity inside. A spring and a positioning protrusion are provided in the cavity. One end of the spring is pressed against the bottom of the cavity, and the other end is pressed against the positioning protrusion. A through hole is provided on the post body corresponding to the positioning groove. A part of the positioning protrusion extends outward from the through hole to form a positioning protrusion head, which falls into the corresponding positioning groove.
4. The apparatus according to any one of claims 1-3, characterized in that, The clamp has two opposing clamping surfaces, and metal sheets are respectively provided on the two opposing clamping surfaces, the metal sheets forming the conductive element; The metal sheet is provided with anti-slip texture.
5. The apparatus according to claim 4, characterized in that, The turntable is provided with a sampling groove, which forms the sampling point, and the bottom of the sampling groove is provided with the light-transmitting hole; A clamping slot is provided on the turntable outside the sampling slot. The clamping slot is connected to the sampling slot, and the clamp is installed in the clamping slot.
6. The apparatus according to claim 4, characterized in that, The device further includes a conductive slip ring, and a connecting shaft is provided on the surface of the turntable away from the sampling point. The connecting shaft is connected to the mover of the conductive slip ring, and the output shaft of the drive is connected to the mover of the conductive slip ring.
7. The apparatus according to claim 5 or 6, characterized in that, Each sampling point on the turntable is provided with a buckle, which is used to fix the power cord of the corresponding sample to be tested.
8. The apparatus according to claim 4, characterized in that, The anti-slip texture includes alternating concave and convex portions, wherein the convex portions form a contact surface with the sample to be tested, and the surface of the convex portions is planar.