Clamping device for multi-channel electrochemical in-situ test and test method

Abstract

The invention relates to the field of batteries, and discloses a clamping device for multichannel electrochemical in-situ testing and a testing method.The device comprises a rotatable rotating disc, the rotating disc is connected with a driving part, n sampling sites are evenly arranged on the rotating disc in the circumferential direction of the rotating disc, n is a natural number, each sampling site is provided with a light through hole, and the light through hole is communicated with the driving part; a clamp is arranged on the turntable on one side of the sampling site, is used for clamping a to-be-tested sample, and is provided with a conductive piece electrically connected with the to-be-tested sample. According to the invention, the plurality of perforated button cells are mounted on the rotatable turntable, so that the cells can be moved to the fixed sampling positions by turns according to the set time sequence in the low-rate charging and discharging process to carry out synchrotron radiation transmission sampling, the machine-hour utilization rate is remarkably improved, and continuous in-situ testing of multiple samples is realized.

Description

Technical Field

[0001] The present invention relates to the field of batteries, and in particular to a clamping device and a testing method for multi-channel electrochemical in-situ testing. Background Art

[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 studying subtle structural changes during battery charging and discharging has increased. Among them, 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 for material characterization studies under in situ, quasi-in situ, and operational conditions due to their good data quantification and high signal-to-noise ratio.

[0003] In actual transmission testing, the open-cell button cell (characterized by a hole in the stainless steel shell surrounding 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) has become the most commonly used cell design in synchrotron radiation in-situ testing due to its inherent advantages. To fully capture the subtle structural changes during the electrochemical reaction, low-rate charge and discharge (e.g., C / 10 to C / 20) is typically used during testing to ensure the complete development of the battery reaction kinetics and avoid reaction skipping or omissions caused by high rates.

[0004] However, there are significant efficiency bottlenecks in the existing synchrotron radiation in-situ testing process: the single-cell test cycle is long, usually taking more than 20 hours; the synchrotron radiation machine time resources are tight, making it difficult to cover multi-material and multi-condition testing requirements; although the battery charging and discharging process is long, the synchrotron radiation time occupied by the actual sampling operation is extremely short (usually collected every 10 minutes, and each time only takes 2 minutes), resulting in a large amount of valuable machine time resources being idle and low testing efficiency. Summary of the Invention

[0005] The purpose of the present invention is to overcome the problem of low efficiency of low-rate charge and discharge testing in the prior art and to provide a clamping device and testing method for multi-channel electrochemical in-situ testing. The device significantly improves machine time utilization by rotating testing multiple batteries and realizes continuous in-situ testing of multiple samples.

[0006] In order to achieve the above-mentioned purpose, the first aspect of the present invention provides a clamping device for multi-channel electrochemical in-situ testing, wherein the device includes a rotatable turntable, which is connected to a driving member, and n sampling sites are evenly arranged on the turntable along its circumference, where n is a natural number, and each of the sampling sites is provided with a light-through hole, and a clamp is provided on the turntable on one side of the sampling site, and the clamp is used to clamp the sample to be tested, and the clamp is provided with a conductive member for electrically connecting to the sample to be tested.

[0007] Generally speaking, n≥2.

[0008] Using this technical solution, multiple test samples (hereafter referred to as open-cell button cells) are secured to a turntable using a specialized fixture, providing reliable mechanical support and electrical connection. The fixture structure accommodates open-cell button cells of various sizes, offering excellent compatibility and facilitating flexible testing of diverse battery systems.

[0009] Preferably, at every preset time interval, the driving member drives the turntable to rotate a preset angle, and the preset angle is 360° / n;

[0010] The device further comprises a positioning structure, and whenever the turntable rotates to reach the preset angle, the positioning structure enables the turntable to remain at the preset angular position.

[0011] Generally speaking, a stepper motor with a control board can be selected as the driving component to control the rotation angle of the turntable, and the limit structure can keep the motor at the sampling position so that each rotation can accurately align the sampling light path and avoid sampling deviation caused by cumulative errors.

[0012] Preferably, the positioning structure includes a positioning groove and a positioning column, one of which is located on the turntable, and the other is located on the supporting structure, and one positioning groove or positioning column is provided on the turntable corresponding to each sampling site;

[0013] In which, the positioning column includes a column body, which has a cavity, and a spring and a positioning protrusion are arranged 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 column body corresponding to the positioning groove, and a part of the positioning protrusion extends outward from the through hole to form a positioning protrusion, and the positioning protrusion falls into the corresponding positioning groove.

[0014] With this structure, the notch of the positioning groove can be a smooth arc surface, which is convenient for the positioning protrusion to enter and slide out. Accurate positioning can be achieved through the cooperation of the positioning groove and the positioning protrusion.

[0015] Preferably, the clamp has two opposite clamping surfaces, and metal sheets are respectively provided on the two opposite clamping surfaces, and the metal sheets form the conductive member;

[0016] The metal sheet is provided with anti-slip lines.

[0017] With this structure, the clamp is designed as a double-sided clamping form, which can reliably contact the positive and negative edges of the battery respectively. The anti-slip texture can make the clamp hold the test sample more firmly.

[0018] Preferably, a sampling slot is provided on the turntable, the sampling slot forms the sampling site, and the light hole is provided at the bottom of the sampling slot;

[0019] A clamp groove is provided on the turntable outside the sampling groove, the clamp groove is communicated with the sampling groove, and the clamp is installed in the clamp groove.

[0020] Preferably, the device further comprises a conductive slip ring. A connecting shaft is provided on the surface of the turntable facing away from the sampling site. The connecting shaft is connected to the movable element of the conductive slip ring, and the output shaft of the driving member is connected to the movable element of the conductive slip ring. With this structure, the conductive slip ring ensures continuous conduction between the electrodes of the sample to be tested and the external constant current charge and discharge system during rotation.

[0021] Preferably, a buckle is provided on the turntable corresponding to each sampling location, which is used to secure the power cord of the corresponding sample to be tested. This structure facilitates the securing of the power cord of the sample to be tested, preventing the wires from shaking or tangling during rotation. The wires are then neatly bundled and connected to the corresponding electrical channels of the slip ring mover.

[0022] Preferably, the anti-slip pattern comprises alternating concave and convex portions, wherein the convex portions form the contact surface with the sample to be tested, and the surface of the convex portions is planar. With this structure, the alternating concave and convex portions, as well as the planar convex portion of the anti-slip pattern, ensure a consistently secure and reliable grip on the sample to be tested.

[0023] A second aspect of the present invention provides a multi-channel electrochemical in-situ battery testing method, wherein the method is performed based on the device described in the first aspect of the present invention, and the method comprises:

[0024] S1, using the clamp to clamp each sample to be tested, with the positive and negative electrodes of each sample to be tested respectively contacting the corresponding conductive member, and with the opening on each sample to be tested facing the corresponding light hole, and one of the samples to be tested being located at a sampling position;

[0025] S2, electrically connecting the conductive members corresponding to the samples to be tested to the charge and discharge devices respectively;

[0026] S3, using the testing device to obtain test data of the sample to be tested located at the sampling position, after a preset time interval, using the driving member to drive the turntable to rotate the next sample to be tested to the sampling position according to a preset angle, and again using the testing device to obtain test data of the sample to be tested located at the sampling position;

[0027] S4, repeat step S3 until sampling of all the samples to be tested is completed.

[0028] Using this method, the perforated button cell to be tested rotates with the turntable. Once the cell to be sampled reaches a fixed sampling position, the turntable stops, completing the sampling process. After completing a sampling cycle, the turntable continues rotating according to the programmed program, moving the next cell to the sampling position. This repetitive process enables timed sampling and automatic rotation of cells at low charge and discharge rates, significantly improving synchrotron radiation machine time utilization while ensuring the continuity of each cell's charge and discharge process and the integrity of its structural evolution data.

[0029] Through the above technical solution, by installing multiple open-hole button batteries (samples to be tested) on a rotatable disc, each battery can be moved to a fixed sampling position for sampling in a set time sequence during the low-rate charge and discharge process, thereby significantly improving the machine time utilization rate and realizing continuous in-situ testing of multiple samples.

[0030] The present invention can be applied to all transmission-mode synchrotron radiation experiments, such as synchrotron radiation X-ray absorption spectroscopy (XAS), X-ray diffraction (XRD), and X-ray emission spectroscopy (XES), and has the advantages of simple structure, strong adaptability, flexible control, portability, and high efficiency.

[0031] Preferably, each time after the sampling of the sample to be tested is completed, the charge and discharge 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.

[0032] Compared with the existing technology, the present invention has the following beneficial effects: by installing multiple open-hole button batteries on a motor-driven turntable, each battery can be moved to a fixed sampling position in a set time sequence during low-rate charging and discharging to perform synchronous radiation transmission sampling, which significantly improves machine time utilization and realizes continuous in-situ testing of multiple samples.

[0033] The present invention can be applied to all transmission-mode synchrotron radiation experiments, such as synchrotron radiation X-ray absorption spectroscopy (XAS), X-ray diffraction (XRD), and X-ray emission spectroscopy (XES), and has the advantages of simple structure, strong adaptability, flexible control, portability, and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of the three-dimensional structure of the clamping device from a first perspective;

[0035] Figure 2 It is a schematic diagram of the three-dimensional structure of the turntable;

[0036] Figure 3 It is a schematic diagram of the planar structure of the turntable;

[0037] Figure 4 It is a schematic diagram of the three-dimensional structure from the second perspective;

[0038] Figure 5 yes Figure 1 Enlarged view of part a in the middle;

[0039] Figure 6 yes Figure 5 Enlarged view of part b in the middle;

[0040] Figure 7 It is a structural diagram of the positioning column.

[0041] Description of Reference Numerals

[0042] 1-turntable; 2-light hole; 3-clamp; 4-positioning structure; 4a-positioning groove; 4b-positioning column; 4b1-column body; 4b2-spring; 4b3-cavity; 4b4-positioning bump; 4b5-through hole; 4b6-positioning boss; 5-anti-slip pattern; 6-sampling slot; 7-clamp slot; 8-conductive slip ring; 9-connecting shaft; 10-output shaft; 11-snap; 12-conductive part. DETAILED DESCRIPTION

[0043] In the description of this application, it should be understood that the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0044] The terms "first", "second", etc. are used to distinguish similar objects and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein. The objects distinguished by "first", "second", etc. are generally of the same type and do not limit the number of objects. For example, the first object can be one or more.

[0045] In addition, the term "and / or" in the specification and claims is used to describe an association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0046] In the description of the present application, unless otherwise specified, “plurality” means two or more.

[0047] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0048] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0049] The sampling position is the sampling location, which allows the test device to sample data from the battery. Generally speaking, the sampling position is directly below the optical path of the test device, so that the test light emitted by the test device can smoothly pass through the opening on the sample to be tested. The corresponding data of the battery is analyzed by the changes in the light signal before and after passing through the battery.

[0050] In one embodiment, Figure 1-7 As shown, a clamping device for multi-channel electrochemical in-situ testing is provided, the device comprising a rotatable turntable 1, the turntable 1 being connected to a driving member (not shown in the figure), the turntable 1 being evenly provided with n sampling sites along its circumference, where n is a natural number, and each of the sampling sites being provided with a light-through hole 2, a clamp 3 being provided on the turntable on one side of the sampling site, the clamp 3 being used to clamp a sample to be tested, and the clamp 3 being provided with a conductive member 12 for electrically connecting to the sample to be tested.

[0051] Turntables are generally made of engineering plastics or composite materials to meet the requirements of structural strength, electrolyte corrosion resistance and light weight, while reducing the risk of short circuits during the removal and installation of button batteries.

[0052] The driving component is generally a stepper motor, and is connected to a stepper motor driving board and a control board so that the single rotation angle of the motor and the preset time interval can be changed according to user needs. Generally speaking, n≥2.

[0053] In some embodiments, a sampling slot 6 is provided on the turntable 1, and the sampling slot 6 is circular, forming the sampling site. The light hole 2 is provided at the bottom of the sampling slot 6, and the light hole 2 is a circular hole. A clamp slot 7 is provided on the turntable 1 outside the sampling slot 6, and the clamp slot 7 is connected to the sampling slot 6, and the clamp 3 is installed in the clamp slot 7.

[0054] In some embodiments, as Figure 5 and 6 As shown, the clamp 3 has two opposite clamping surfaces, and metal sheets are respectively provided on the two opposite clamping surfaces. The metal sheets form the conductive member 12, and anti-slip lines 5 are provided on the metal sheets.

[0055] The anti-slip pattern 5 includes concave portions 5a and convex portions 5b that are alternately connected in sequence, wherein the convex portions 5b form a contact surface with the sample to be tested, and the surface of the convex portions 5b is planar.

[0056] In some embodiments, 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 away from the sampling site. The connecting shaft 9 is connected to the mover of the conductive slip ring 8. The output shaft 10 of the driving member is connected to the mover of the conductive slip ring 8.

[0057] The purpose of providing a conductive slip ring is to ensure that the power lines can always remain in order 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. At this time, the power lines will rotate with the turntable, or other methods can be used to keep the power lines in order. This is not the focus of this application and will not be elaborated here.

[0058] In some embodiments, as Figure 3 As shown, a buckle 11 is provided on the turntable 1 corresponding to each sampling site, and the buckle 11 is used to fix the power cord of the corresponding sample to be tested.

[0059] There is no particular limitation on the position of the buckle 11, as long as it can fix the corresponding power line. In this example, Figure 4As shown, the sampling site is located on the front of the turntable 1, and the buckle 11 is located on the back of the turntable 1. In this way, the power line connected to the positive and negative electrodes 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, and then continues downward to connect with the corresponding electrical channel of the movable part of the conductive slip ring 8, and the corresponding electrical channel of the stator part of the conductive slip ring is connected to the charging and discharging device.

[0060] In addition, the buckle 11 can also be set on the front side of the turntable 1 near the sampling slot 6, and the turntable 1 is further provided with a wire hole (not shown in the figure) corresponding to the buckle 11. In this way, the power cord connected to the positive and negative poles of the sample to be tested is first fixed by the corresponding buckle 11, and then the power cord passes through the corresponding wire hole and is connected downward to the corresponding electrical channel of the movable part of the conductive slip ring 8, and the corresponding electrical channel of the stator part of the conductive slip ring is connected to the charging and discharging device.

[0061] In some embodiments, at every preset time interval, the driving member drives the turntable 1 to rotate a preset angle, and the preset angle is 360° / n;

[0062] The device further comprises a positioning structure 4 , and whenever the turntable 1 rotates to reach the preset angle, the positioning structure 4 enables the turntable 1 to remain at the preset angular position.

[0063] The positioning structure 4 includes a positioning groove 4a and a positioning column 4b, one of which is located on the turntable 1, and the other is located on the supporting structure (not shown in the figure). A positioning groove 4a or a positioning column 4b is provided on the turntable 1 corresponding to each sampling site.

[0064] In some embodiments, as Figure 4 As shown, the positioning groove 4a is located on the back of the turntable 1, and the positioning column 4b is located on the supporting structure (not shown in the figure). There is a positioning groove 4a on the back of the turntable 1 corresponding to each sampling site.

[0065] In some embodiments, the positioning column 4b includes a column body 4b1, which has a cavity 4b3. A spring 4b2 and a positioning protrusion 4b4 are provided in the cavity 4b3. One end of the spring 4b2 is pressed against the bottom of the cavity 4b3, and the other end is pressed against the positioning protrusion 4b4. A through hole 4b5 is provided on the column body 4b1 corresponding to the positioning groove 4a. A part 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.

[0066] When the driving member is started, the torsion provided by the driving member overcomes the force provided by the spring 4b2, and the turntable 1 rotates so that the positioning protrusion 4b6 slides out of the positioning groove 4a, releasing the positioning. When the next sample to be tested rotates to the sampling position, the driving member stops providing the torsion, and the positioning protrusion 4b6 slides into the positioning groove 4a corresponding to the next sample to be tested. The spring 4b2 presses the positioning protrusion 4b6 tightly against the bottom of the corresponding positioning groove 4a, thereby achieving positioning. As the turntable 1 continues to rotate, the positioning protrusion 4b6 continuously cooperates with the positioning groove 4a corresponding to each sample to be tested, thereby achieving positioning.

[0067] In some embodiments, a multi-channel electrochemical in-situ battery testing method is provided, which is performed based on the above device, and the method includes:

[0068] S1. Use the clamp 3 to clamp a sample to be tested (open-hole button battery) respectively, and the positive and negative poles of each sample to be tested are in contact with the corresponding conductive member 12 respectively, and the opening on each sample to be tested is facing the corresponding light-through hole 2, and one of the samples to be tested is located at the sampling position.

[0069] The sample to be tested may be a battery that has been left to rest for more than 12 hours in advance to ensure that the open circuit voltage is normal.

[0070] In this example, n is 6, that is, the device can clamp 6 open-hole button batteries, and the positive and negative edges of the 6 open-hole button batteries are respectively clamped by the corresponding clamps 3 and in contact with the corresponding conductive parts 12. The hole center line of the light hole 2 coincides with the hole center line of the corresponding open hole on the sample to be tested.

[0071] The positioning protrusion 4b6 falls into the positioning groove 4a corresponding to the sample to be tested at the sampling position, thereby achieving positioning of the sample to be tested at this position.

[0072] S2, electrically connecting the conductive members 12 corresponding to the samples to be tested to a charge and discharge device, which is a constant current charge and discharge device.

[0073] S3, using the testing device to obtain the test data of the sample to be tested located at the sampling position, after a preset time interval, using the driving member to drive the turntable to rotate the next sample to be tested to the sampling position according to a preset angle, and again using the testing device to obtain the test data of the sample to be tested located at the sampling position.

[0074] The charging and discharging device is typically a constant-current device (e.g., a brand like Lanhe or Xinwei). The testing device is a synchrotron radiation tester. During sampling, the light emitted by the synchrotron radiation tester passes through the hole in the perforated button battery and then passes through the sample to be tested. By analyzing the changes in light information before and after, the corresponding data of the sample to be tested can be obtained. In this example, the preset interval is 60 seconds.

[0075] Generally speaking, after the preset interval time is reached, the test light source can be paused for 15 seconds, during which time the driver is controlled to drive the turntable 1 to rotate, and then the light source is turned on again to sample the next button battery with a hole. This is equivalent to sampling the next sample every 75 seconds.

[0076] S4, repeat step S3 until all the samples to be tested are sampled. When the turntable 1 rotates one circle, a round of sampling of all the samples is completed.

[0077] In some embodiments, the method further includes: after each sampling of the sample to be tested is completed, using the charge and discharge device to continue charging and discharging the sample to be tested according to a preset program, and when a preset test time is reached, repeating S3 and S4.

[0078] The preset programs adopt different charge and discharge programs for different battery tests, and can be selected according to actual test requirements. This is a prior art in this field and will not be described in detail here.

[0079] That is, after each open-hole button battery to be tested completes one round of data collection, it enters the constant current charge and discharge phase. When the constant current charge and discharge time is sufficient to require another round of data collection, 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, the interval between two test data of the same open-hole button battery to be tested is 75s × 6 = 450s.

[0080] This step is repeated continuously until the constant current charge and discharge of all the open-hole button batteries to be tested meet the test requirements, that is, the data collection of all the open-hole button batteries to be tested is obtained.

[0081] In addition, after completing a round of data sampling for all samples, the continuous constant current charge and discharge stage is entered for 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.

[0082] The method provided by the present invention, while collecting battery data, each battery is continuously electrically connected to an external constant current charge and discharge device through a conductive slip ring, without interrupting the charge and discharge process, and multiple samples can be tested at one time, greatly improving machine time utilization and test efficiency.

[0083] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, various simple variations of the technical solution of the present invention may be made, including combining the various technical features in any other appropriate manner. These simple variations and combinations should also be regarded as disclosed in the present invention and fall within the scope of protection of the present invention.

Claims

1. A multi-channel electrochemical in-situ testing clamping device, characterized in that: The device includes a rotatable turntable connected to a driving member. The turntable is evenly provided with n sampling sites along its circumference, where n is a natural number. Each sampling site is provided with a light-through hole. A clamp is provided on the turntable on one side of the sampling site. The clamp is used to clamp the sample to be tested, and the clamp is provided with a conductive member for electrically connecting to the sample to be tested.

2. The device according to claim 1, wherein At every preset time interval, the driving member drives the turntable to rotate a preset angle, and the preset angle is 360° / n; The device further comprises a positioning structure, and whenever the turntable rotates to reach the preset angle, the positioning structure enables the turntable to remain at the preset angular position.

3. The device according to claim 2, wherein The positioning structure includes a positioning groove and a positioning column, one of which is located on the turntable, and the other is located on the supporting structure, and a positioning groove or a positioning column is provided on the turntable corresponding to each sampling site; In which, the positioning column includes a column body, which has a cavity, and a spring and a positioning protrusion are arranged 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 column body corresponding to the positioning groove, and a part of the positioning protrusion extends outward from the through hole to form a positioning protrusion, and the positioning protrusion falls into the corresponding positioning groove.

4. The device according to any one of claims 1 to 3, wherein: The clamp has two opposite clamping surfaces, and metal sheets are respectively provided on the two opposite clamping surfaces, and the metal sheets form the conductive member; The metal sheet is provided with anti-slip lines.

5. The device according to claim 4, wherein The turntable is provided with a sampling slot, the sampling slot forms the sampling site, and the bottom of the sampling slot is provided with the light hole; A clamp groove is provided on the turntable outside the sampling groove, the clamp groove is communicated with the sampling groove, and the clamp is installed in the clamp groove.

6. The device according to claim 4, wherein The device further comprises a conductive slip ring. A connecting shaft is provided on the surface of the turntable facing away from the sampling site. The connecting shaft is connected to the mover of the conductive slip ring. The output shaft of the driving member is connected to the mover of the conductive slip ring.

7. The device according to claim 5 or 6, wherein: A buckle is provided on the turntable corresponding to each sampling site, and the buckle is used to fix the power cord of the corresponding sample to be tested.

8. The device according to claim 4, wherein The anti-slip pattern includes concave portions and convex portions that are alternately connected in sequence, wherein the convex portions form a contact surface with the sample to be tested, and the surface of the convex portions is planar.

9. A multi-channel electrochemical in-situ battery testing method, characterized in that: Based on the device according to any one of claims 1 to 8, the method comprises: S1, using the clamp to clamp each sample to be tested, with the positive and negative electrodes of each sample to be tested respectively contacting the corresponding conductive member, and with the opening on each sample to be tested facing the corresponding light hole, and one of the samples to be tested being located at a sampling position; S2, electrically connecting the conductive members corresponding to the samples to be tested to the charge and discharge devices respectively; S3, using the testing device to obtain test data of the sample to be tested located at the sampling position, after a preset time interval, using the driving member to drive the turntable to rotate the next sample to be tested to the sampling position according to a preset angle, and again using the testing device to obtain test data of the sample to be tested located at the sampling position; S4, repeat step S3 until sampling of all the samples to be tested is completed.

10. The method according to claim 9, wherein: The method further includes: after each sampling of the sample to be tested is completed, using the charge and discharge device to continue charging and discharging the sample to be tested according to a preset program, and when a preset test time is reached, repeating S3 and S4.

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