Testing device

Abstract

The utility model relates to a testing device. The testing device comprises a base, a movable plate and a force application part, the base comprises a bottom plate, the movable plate and the bottom plate are arranged in parallel at an interval, and a cell mounting space is formed between the movable plate and the bottom plate; the movable plate can move relative to the bottom plate to get close to or away from the bottom plate; the force application part is connected between the base and the movable plate and acts on the movable plate with constant preset force, so that the movable plate moves towards one side of the bottom plate. The testing device can be used for carrying out constant-pressure cycle testing on the battery cell, the overall structure can be simplified, the cost is reduced, and operation is convenient.

Description

Technical Field

[0001] This application relates to the field of testing equipment technology, specifically to a testing device. Background Technology

[0002] Constant pressure cycling mode is a major mode for current battery cell charge-discharge cycle testing. As charge-discharge cycles proceed, the cell thickness will continue to accumulate. Current research has shown that there is a comfortable pressure range for battery cell cycling. When the expansion force increases beyond the comfortable pressure range, the battery cell cycle performance will be affected. Constant pressure cycling mode can ensure that the battery cell withstands constant pressure throughout its entire life cycle. When the constant pressure is set within the battery cell's comfortable pressure range, it is beneficial to the cycling performance.

[0003] Current solutions for achieving constant pressure cycling include using constant pressure cycling testing equipment or applying gravity. The constant pressure cycling testing equipment consists of a force application system, a monitoring system, and a feedback system. Its main principle is that the force application system, composed of a servo motor or hydraulic system, applies a constant force to the battery cell. The monitoring system monitors the cyclic expansion force of the battery cell in real time. When the expansion force exceeds a set value, the feedback system sends a signal to the force application system to adjust the force applied to the battery cell, ensuring it remains within a comfortable pressure range. This equipment is relatively complex and costly, and the battery cell cycling generally requires operation within this equipment, limiting the choice of cycling environment, such as room temperature cycling, high temperature cycling, or water-cooled cycling. Another solution utilizes the principle of constant gravity, applying weights to the surface of the battery cell to achieve constant pressure cycling. However, using weights to achieve constant comfortable pressure cycling requires a mass of at least tens of kilograms, which is heavy and bulky, making operation inconvenient. Furthermore, gravity is always vertically downward, while the cyclic expansion force of the battery cell is generally horizontal, making direct application impossible. Specific tooling is needed to reverse the direction of gravity.

[0004] Therefore, how to conduct constant pressure cycle testing on battery cells, simplify the overall structure, reduce costs, and facilitate operation is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of this application is to provide a testing device that can be used to perform constant pressure cycle testing on battery cells, which can simplify the overall structure, reduce costs and facilitate operation.

[0006] To address the aforementioned technical problems, this application provides a testing device, including a base, a movable plate, and a force-applying component; the base includes a bottom plate, the movable plate is arranged parallel to and spaced apart from the bottom plate, and forms a cell mounting space between the movable plate and the bottom plate; the movable plate is movable relative to the bottom plate to move closer to or further away from the bottom plate; the force-applying component is connected between the base and the movable plate, and the force-applying component applies a constant preset force to the movable plate, causing the movable plate to move to one side of the bottom plate.

[0007] During the constant pressure charge-discharge cycle test of the battery cell using this testing device, the force-applying component applies a constant preset force to the movable plate, causing the movable plate to move to one side of the base plate and clamp the battery cell. The comfortable pressure range for the battery cell is uncertain. Therefore, multiple sets of tests can be conducted, each using a different preset force. The battery cell is charged and discharged in cycles until the capacity retention rate reaches a preset threshold, or the test is stopped after a preset number of charge-discharge cycles. Each set of tests can obtain a curve showing the number of cycles and the capacity retention rate. Based on the curves of each set of tests, the comfortable pressure range for the battery cell can be determined.

[0008] This testing device can perform cyclic testing of battery cells under constant pressure. By presetting different constant pressures to test the cyclic performance of the battery cells, the optimal and comfortable pressure range of the battery cells can be obtained.

[0009] When lithium-ion battery cells are used in groups, expansion spaces are needed between the cells. A key function of these spaces is to reduce the cycling force of the cells. Adding buffer pads or flexible liquid cooling plates between the cells is the primary solution for achieving this expansion space. The compression characteristics of these buffer pads or flexible liquid cooling plates need to be designed based on the cyclic expansion force of the cells. If the optimal comfortable pressure range for each cell can be determined, corresponding compression characteristics can be designed to allow the cells to cycle under comfortable pressure, thus improving their cycling performance.

[0010] Furthermore, the force-applying component is connected to the base and the movable plate at both ends, respectively. The force-applying component clamps the battery cell through the movable plate and the base plate to apply a constant force to the cell. The movable plate can move relative to the base; therefore, the length of the force-applying component changes with the movement of the movable plate. Specifically, during testing, there is no need to detect, calculate, or adjust the force-applying component. The structure of this component is simple, easy to connect, and effectively reduces costs. Moreover, compared to methods that use gravity for testing, this method is more operable.

[0011] Optionally, the force-applying component is detachably connected to both the base and the movable plate.

[0012] Optionally, it also includes a displacement detection unit, which is disposed on the base and used to detect the displacement of the movable plate relative to the base plate.

[0013] Optionally, the base further includes a support portion located on the side of the movable plate away from the base plate. The support portion is fixed to the base plate, and the displacement detection portion is fixed to the support portion. The probe of the displacement detection portion abuts against the side wall of the movable plate away from the base plate.

[0014] Optionally, the base is further provided with a guide rod that passes through the movable plate, and the movable plate is movable relative to the base plate along the axial direction of the guide rod.

[0015] Optionally, the base plate and the support portion are fixed by the guide rod.

[0016] Optionally, the base plate and the support are fixed together by multiple screws arranged circumferentially, the screws forming the guide rods.

[0017] Optionally, the force-applying component includes an elastic assembly, which includes a spring and a slider connected to one end of the spring. The axis of the spring is arranged at an angle to the direction of movement of the movable plate. The end of the spring away from the slider is connected to the support portion. The side wall of the movable plate is provided with a slide rail, and the slider can slide along the slide rail. Alternatively, the end of the spring away from the slider is connected to the movable plate. The side wall of the support portion is provided with a slide rail, and the slider can slide along the slide rail. The slide rail is arranged at an angle to the direction of movement of the movable plate.

[0018] Optionally, the force-applying component includes a connecting block, the length of which has a stable restoring force within a preset deformation range, one end of which is connected to the movable plate along its length, and the other end of which is connected to the support portion.

[0019] Optionally, the force-applying component includes a constant-force spring, one end of which is connected to the base and the other end of which is connected to the movable plate.

[0020] Optionally, the force-applying component includes a pressure regulating valve and a drive cylinder. The drive cylinder includes a cylinder body and a piston rod. One of the cylinder body and the piston rod is connected to the base, and the other is connected to the piston rod. The pressure regulating valve is used to adjust the pressure inside the cylinder body to a constant preset pressure. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the test device when the force-applying component is a constant-force spring;

[0022] Figure 2 yes Figure 1 Top view;

[0023] Figure 3 yes Figure 1 Schematic diagram of the middle floor structure;

[0024] Figure 4 yes Figure 1 Schematic diagram of the structure of the movable plate in the middle;

[0025] Figure 5 This is a schematic diagram of the test device when the force-applying components are a pressure regulating valve and a drive cylinder;

[0026] Figure 6 This is a schematic diagram of the testing device when the force-applying component is an elastic assembly;

[0027] Figure 7 This is a schematic diagram of the test device when the force-applying component is a connecting block;

[0028] Figure 8 It is the material compression characteristic curve of the connecting block.

[0029] Appendix Figures 1-8 The reference numerals in the attached figures are explained as follows:

[0030] 1. Base, 11. Base plate, 111. First fixing hole, 12. Support part, 121. Second fixing hole, 13. Screw;

[0031] 2 movable plates, 21 guide holes;

[0032] 3 guide rods;

[0033] 4. Force-applying components, 41. Constant force spring, 42. Drive cylinder, 421. Cylinder body, 422. Piston rod, 43. Elastic assembly, 431. Spring, 432. Slider, 44. Connecting block;

[0034] 5 displacement detection units, 51 probes, 52 dial gauges;

[0035] 6. Connection structure;

[0036] 7. Linear bearings;

[0037] 8. Lock nuts;

[0038] 9 Fasteners;

[0039] 10 battery cells. Detailed Implementation

[0040] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] This application provides a testing device that can perform constant pressure charge-discharge cycle tests on battery cells. As the battery cell undergoes charge-discharge cycles, the cell thickness will continuously accumulate. Studies have shown that there is a comfortable pressure range for battery cell cycling. In constant pressure cycling mode, the battery cell can be guaranteed to withstand constant pressure throughout its entire life cycle. When the constant pressure is set within the comfortable pressure range of the battery cell, it is beneficial to the cycling performance.

[0042] like Figure 1 and Figure 2 As shown, the testing device provided in this embodiment includes a base 1, a movable plate 2, and a force-applying component 4. The base 1 includes a bottom plate 11. The movable plate 2 is arranged parallel to and spaced apart from the bottom plate 11, forming a cell mounting space between the movable plate 2 and the bottom plate 11. This cell mounting space is used to install the cell 10 to be tested. The movable plate 2 can move relative to the bottom plate 11 to move closer to or further away from the bottom plate 11. When the cell 10 bulges, it can push the movable plate 2 to move away from the bottom plate 11.

[0043] The force-applying component 4 is connected between the base 1 and the movable plate 2. During the testing of the battery cell 10, the battery cell 10 to be tested is installed in the battery cell installation space. The force-applying component 4 can act on the movable plate 2, causing the movable plate 2 to move to one side of the base plate 11 and clamp the battery cell 10 located in the battery cell installation space. The force applied by the force-applying component 4 to the movable plate 2 is a constant preset force. That is to say, even if the movable plate 2 moves relative to the base plate 11, the force applied by the force-applying component 4 is constant.

[0044] Specifically, when performing charge-discharge cycle tests on the battery cell 10, the movable plate 2 is moved away from the base plate 11, increasing the battery cell installation space. Then, the battery cell 10 to be tested is placed in the battery cell installation space. The force-applying component 4 applies a constant preset force to the movable plate 2, causing the movable plate 2 to move towards the base plate 11 and clamp the battery cell 10 located in the battery cell installation space.

[0045] During the constant pressure charge-discharge cycle test of the battery cell 10 using this testing device, the force-applying component 4 applies a constant preset force to the movable plate 2, causing the movable plate 2 to move towards one side of the base plate 11 and clamp the battery cell 10. The comfortable pressure range of the battery cell 10 is uncertain. Therefore, multiple sets of tests can be conducted, each with a different preset force. The battery cell 10 is charged and discharged in cycles until the capacity retention rate of the battery cell 10 reaches a preset threshold, or the test is stopped after a preset number of charge-discharge cycles. Each set of tests can obtain a curve of the number of cycles and the capacity retention rate. Based on the curves of each set of tests, the comfortable pressure range of the battery cell 10 can be determined.

[0046] In other words, the testing device proposed in this embodiment can perform cyclic testing of the battery cell 10 under constant pressure. By presetting different constant pressures to test the cyclic performance of the battery cell 10, the optimal comfortable pressure range of the battery cell 10 can be obtained.

[0047] When lithium-ion cells 10 are used in groups, expansion spaces are needed between cells 10. A key function of these spaces is to reduce the cycling force of the cells 10. Adding buffer pads or flexible liquid cooling plates between the cells 10 is the main solution to achieve this expansion space. The compression characteristics of the buffer pads or flexible liquid cooling plates need to be designed based on the cycling expansion force of the cells 10. If the optimal comfortable pressure range for each cell 10 can be determined, corresponding compression characteristics can be designed to allow the cells 10 to cycle under comfortable pressure, thereby improving their cycling performance.

[0048] Furthermore, the two ends of the force-applying component 4 are connected to the base 1 and the movable plate 2, respectively. The force-applying component 4 clamps the battery cell 10 through the movable plate 2 and the base plate 11 to apply a constant force to the battery cell 10. The movable plate 2 can move relative to the base 1. Therefore, the length of the force-applying component 4 changes with the movement of the movable plate 2. Specifically, during the testing process, there is no need to detect, calculate, or adjust the force-applying component 4. The structure of the force-applying component 4 is relatively simple, easy to connect, and can effectively reduce costs. Moreover, compared with the solution that uses gravity for testing, the solution in this embodiment is more operable.

[0049] The force-applying component 4 is detachably connected to both the base 1 and the movable plate 2. This configuration allows for multiple tests with different preset forces in each test group without requiring a complete replacement of the testing device; only the corresponding force-applying component 4 needs to be replaced. Furthermore, the preset force requirements differ for different battery cells 10, necessitating only the replacement of the appropriate force-applying component 4. Of course, the connection between the force-applying component 4 and the base 1 and movable plate 2 could be non-detachable. However, making the force-applying component 4 detachably connected to the base 1 and movable plate 2 effectively improves the applicability and flexibility of the testing device, further reducing costs.

[0050] The testing device also includes a displacement detection unit 5, which is installed on the base 1 and is used to detect the displacement of the movable plate 2 relative to the base plate 11. During the test, the battery cell 10 is subjected to multiple charge and discharge cycles, the thickness of the battery cell 10 gradually increases, the distance between the movable plate 2 and the base plate 11 becomes larger and larger, the battery cell installation space becomes larger and larger, and the length of the force-applying component 4 will change accordingly. However, the force exerted by the force-applying component 4 on the movable plate 2 remains constant. The displacement detection unit 5 can detect the displacement of the movable plate 2 relative to the base plate 11. This displacement is the increase in the thickness of the battery cell 10, and the expansion characteristic curve can be obtained based on the displacement and the preset force.

[0051] After determining the comfortable pressure range of cell 10 through the cycle count and capacity retention curves, the expansion characteristic curve corresponding to the preset force within that pressure range can be obtained. Then, when designing cell groups and battery packs, the spacing between two adjacent cells 10 can be set according to this expansion characteristic curve. The thickness and compression characteristics of components such as buffer pads or flexible liquid cooling plates sandwiched between two cells 10 can also be designed based on this expansion characteristic curve. In other words, the testing device provided in this embodiment can also measure the thickness change of cell 10 during charge-discharge cycle testing, ensuring the cycle performance of cell 10.

[0052] like Figure 1 and Figure 2 As shown, the base 1 also includes a support part 12, which is located on the side of the movable plate 2 away from the base plate 11. The support part 12 is fixed to the base plate 11. The dial indicator 52 of the displacement detection part 5 is fixed to the support part 12, and the probe 51 of the displacement detection part abuts against the side wall of the movable plate 2 away from the base plate 11. When the movable plate 2 moves relative to the base plate 11 toward the support part 12, it can push the probe 51 and realize displacement detection.

[0053] like Figure 1 and Figure 2 As shown, the support part 12 is a support plate, which is arranged parallel to the base plate 11 and the movable plate 2. The displacement detection part 5 is located on the side of the support plate away from the movable plate 2. The probe 51 passes through the support plate and abuts against the movable plate 2. After passing through the support plate, the probe 51 is fixed to the support plate by the locking nut 8. In the initial state, the cell 10 does not bulge. At this time, the probe 51 has a certain pre-compression to ensure the fixed stability between the displacement detection part 5 and the support part 12, thereby ensuring the accuracy of the displacement detection result.

[0054] Of course, the support part 12 can be omitted, and the displacement detection part 5 can be set on the base plate 11 and used to detect the movement displacement of the movable plate 2. The setting of the support part 12 can avoid the installation of the displacement detection part 5 from interfering with the installation of the battery cell 10.

[0055] Alternatively, in this embodiment, the displacement detection unit 5 can also be a displacement sensor that detects by infrared light, etc. Setting it to include a dial gauge 52 and a probe 51 can ensure detection accuracy and reliability and reduce the probability of failure.

[0056] like Figure 1 and Figure 2As shown, the base 1 also includes a guide rod 3. The guide rod 2 is fixed relative to the base plate 11. The movable plate 2 is provided with a guide hole 21. The guide rod 3 passes through the corresponding guide hole 21. The movable plate 2 can move relative to the base plate 11 along the axial direction of the guide rod 3. There are at least two guide rods 3. The arrangement of the guide rods 3 can provide guidance for the movement of the movable plate 2, ensure the stability of the movement of the movable plate 2 relative to the base plate 11, and ensure that the movable plate 2 is parallel to the base plate 11 so as to apply a stable force to the battery cell 10.

[0057] The base plate 11 and the support part 12 are fixed by the guide rod 3. Of course, in this embodiment, there is no limitation on the fixing method between the base plate 11 and the support part 12. For example, they can also be fixed by another fixing part, which can be a connecting rod that does not pass through the movable plate 2. Fixing the base plate 11 and the support part 12 by the guide rod 3 can simplify the overall structure.

[0058] like Figure 1 As shown, the base plate 11 and the support portion 12 are fixed together by multiple screws 13 arranged circumferentially, and the guide rod 3 is formed by the screws 13. The base plate 11 has multiple first fixing holes 111 spaced apart circumferentially (e.g., ...). Figure 3 As shown, the support portion 12 is provided with a plurality of second fixing holes 121 spaced apart along the circumference. The number of first fixing holes 111 and second fixing holes 121 are the same and they are arranged in a one-to-one correspondence. The first fixing hole 111 can be a threaded hole, and one end of the screw 13 is threadedly engaged with the threaded hole for fixation. The second fixing hole 121 is a through hole, and the end of the screw 13 away from the threaded hole can be fixed to the second fixing hole 121 by two nuts, which abut against the two side surfaces of the support portion 12 respectively. Alternatively, the first fixing hole 111 can be a threaded hole and the second fixing hole 121 can be a through hole, or both the first fixing hole 111 and the second fixing hole 121 can be through holes.

[0059] A linear bearing 7 is also provided between the inner wall of the guide hole 21 and the outer wall of the guide rod 3 to ensure the smooth movement of the movable plate 2, avoid jamming during movement, and ensure the accuracy of the test results.

[0060] The force-applying component 4 is connected between the base 1 and the movable plate 2. To ensure the stability of the force application, such as... Figure 4 As shown, the movable plate 2 is provided with force-applying components 4 on at least two opposite sides. The number of force-applying components 4 on each side can be one or two. The movable plate 2 is a square plate, and it can have force-applying components 4 on either two opposite sides or on all four sides. The side walls of the base 1 and the movable plate 2 are respectively provided with connecting structures 6, such as... Figure 4 As shown, the connecting structure 6 is used to connect with the force-applying component 4.

[0061] In this embodiment, the specific structure of the force-applying component 4 is not limited, such as... Figure 1 and Figure 2 In the embodiment shown, the force-applying component 4 is a constant force spring 41. The spring force of the constant force spring 41 remains unchanged within a certain deformation range. One end of the constant force spring 41 is connected to the base plate 11 and the other end is connected to the movable plate 2. In the initial test state, the battery cell 10 does not bulge, and the constant force spring 41 is in a pre-stretched state and can provide a constant preset force to the movable plate 2. When the battery cell 10 bulges, the length of the constant force spring 41 increases, but its force on the movable plate 2 remains unchanged.

[0062] During the charge and discharge cycle, the cell 10 bulges and pushes the movable plate 2 to move away from the base plate 11. The movable plate 2 stretches the constant force springs 41, and each constant force spring 41 provides a constant force. At the same time, the movable plate 2 moves to push the probe 51 to detect the increase in thickness of the cell 10.

[0063] Of course, one end of the constant force spring 41 can be connected to the movable plate 2, and the other end can be connected to the support part 12. The constant force spring 41 has a simple structure, low cost, and can effectively ensure the stability of the force exerted on the movable plate 2 during the test.

[0064] In this embodiment, the connection method between the constant force spring 41 and the movable plate 2, as well as the base plate 11 or the support part 12, is not limited, such as... Figure 1 and Figure 2 The inner ring of the constant force spring 41 shown is connected to the connection structure 6 of the side wall of the base plate 11, and the free end of the constant force spring 41 is connected to the connection structure 6 of the side wall of the movable plate 2 through the fastener 9.

[0065] like Figure 5 In the illustrated embodiment, the force-applying component 4 includes a pressure regulating valve (not shown) and a drive cylinder 42. The drive cylinder 42 includes a cylinder body 421 and a piston rod 422. One of the cylinder body 421 and the piston rod 422 is connected to the base 1, and the other is connected to the movable plate 2. The pressure regulating valve is used to adjust the pressure inside the cylinder body 421 to a constant preset pressure, so that the force exerted by the drive cylinder 42 on the movable plate 2 remains the same. The drive cylinder 42 can be either a hydraulic cylinder or a pneumatic cylinder. The pressure inside the cylinder body 421 is automatically adjusted by the pressure regulating valve to maintain a constant pressure. The structure is simple and easy to implement. The specific implementation method is well known to those skilled in the art and will not be described in detail here for the sake of brevity.

[0066] The drive cylinder 42 can be connected between the base plate 11 and the movable plate 2, or it can be as follows: Figure 5The connection shown can be between the movable plate 2 and the support part 12. Alternatively, the cylinder body 421 can be connected to the connection structure 6 of the support part 12, and the end of the piston rod 422 can be connected to the connection structure 6 of the movable plate 2. Or, the piston rod 422 can be connected to the support part 12, and the cylinder body 421 can be connected to the movable plate 2.

[0067] like Figure 6 In the illustrated embodiment, the force-applying component 4 includes two sets of elastic components 43. Each elastic component 43 is a non-linear mechanism with adjustable stiffness, consisting of a spring 431 and a slider 432. The slider 432 is connected to one end of the spring 431. The axis of the spring 431 is arranged at an angle to the moving direction of the movable plate 2. The end of the spring 431 away from the slider 432 is connected to the movable plate 2. The side wall of the support 12 is provided with a slide rail (not shown in the figure), which is arranged at an angle to the moving direction of the movable plate 2. The slider 432 can slide along the slide rail. Spring 431 is in a pre-compressed state, and the restoring force it exerts on the movable plate 2 is the aforementioned constant preset force. When the movable plate 2 moves to one side of the support part 12, it can compress the spring 431. The spring 431 acts on the slider 432 along its axial direction. Since there is an angle between the axial direction of the spring 431 and the moving direction of the movable plate 2, the component of the force exerted by the spring 431 on the slider 432 in the direction of slide extension will act on the slider 432 to make it slide along the slide, and ensure that the force exerted by the spring 431 on the movable plate 2 is constant.

[0068] Two sets of elastic components 43 are provided on one side of the movable plate 2, and the springs 431 of these two sets of elastic components 43 are arranged in a figure-eight shape. The sliders 432 of the two sets of elastic components 43 can move closer or further apart along the slide. The slide and the moving direction of the movable plate 2 are preferably arranged perpendicularly. This arrangement can further ensure a constant force. Specifically, the angle between the axis of the spring 431 and the axis of the guide rod 3 can be designed according to the preset force requirements, which will not be elaborated here.

[0069] Of course, the side wall of the movable plate 2 can also be provided with a slide rail, and the side of the spring 431 away from the slider 432 can be connected to the support part 12.

[0070] like Figure 7In the illustrated embodiment, the force-applying component 4 includes a connecting block 44. One end of the connecting block 44 along its length is connected to the movable plate 2, and the other end of the connecting block 44 along its length is connected to the support portion 12. The length of the connecting block 44 has a stable restoring force within a preset deformation range. The material compression curve of the connecting block 44 can be as shown in Figure 8, having a plateau region. That is, the length of the connecting block 44 has a stable restoring force within a preset compression deformation range. In this case, the connecting block 44 can be made of foamed silicone or foam. The connecting block 44 is in a pre-compressed state along its length, and the compressed connecting block 44 provides a stable force to the movable plate 2 through its restoring force. Of course, the force-applying component 4 can also be configured to connect between the base plate 11 and the movable plate 2. In this case, the connecting block 44 is made of a material with a plateau region in its material tensile curve, and the length of the connecting block 44 has a stable restoring force within a preset tensile deformation range.

[0071] In the description of this application, it should be understood that the terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this application.

[0072] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0073] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A testing device, characterized in that, It includes a base (1), a movable plate (2), and a force-applying component (4); The base (1) includes a base plate (11), and the movable plate (2) is arranged parallel to and spaced apart from the base plate (11), forming a cell installation space between the movable plate (2) and the base plate (11). The movable plate (2) is capable of moving relative to the base plate (11) to move closer to or further away from the base plate (11). The force-applying component (4) is connected between the base (1) and the movable plate (2). The force-applying component (4) applies a constant preset force to the movable plate (2), causing the movable plate (2) to move toward one side of the base plate (11).

2. The testing apparatus according to claim 1, characterized in that, The force-applying component (4) is detachably connected to the base (1) and the movable plate (2).

3. The testing apparatus according to claim 1 or 2, characterized in that, It also includes a displacement detection unit (5), which is located on the base (1) and is used to detect the displacement of the movable plate (2) relative to the base plate (11).

4. The testing apparatus according to claim 3, characterized in that, The base (1) also includes a support (12), which is located on the side of the movable plate (2) away from the base plate (11). The support (12) is fixed to the base plate (11), and the displacement detection part (5) is fixed to the support (12). The probe (51) of the displacement detection part (5) abuts against the side of the movable plate (2) away from the base plate (11).

5. The testing apparatus according to claim 4, characterized in that, The base (1) is also provided with a guide rod (3), which passes through the movable plate (2) and the movable plate (2) is able to move relative to the base plate (11) along the axial direction of the guide rod (3).

6. The testing apparatus according to claim 5, characterized in that, The base plate (11) and the support (12) are fixed by the guide rod (3).

7. The testing apparatus according to claim 6, characterized in that, The base plate (11) and the support (12) are fixed together by a plurality of screws (13) arranged circumferentially, and the screws (13) form the guide rod (3).

8. The testing apparatus according to any one of claims 4-7, characterized in that, The force-applying component (4) includes an elastic assembly (43), which includes a spring (431) and a slider (432) connected to one end of the spring (431). The axis of the spring (431) is arranged at an angle to the moving direction of the movable plate (2). The end of the spring (431) away from the slider (432) is connected to the support (12), and the side wall of the movable plate (2) is provided with a slide rail, so that the slider (432) can slide along the slide rail; or, the end of the spring (431) away from the slider (432) is connected to the movable plate (2), and the side wall of the support (12) is provided with a slide rail, so that the slider (432) can slide along the slide rail; The slide is arranged at an angle to the moving direction of the movable plate (2).

9. The testing apparatus according to any one of claims 4-7, characterized in that, The force-applying component (4) includes a connecting block (44). The length of the connecting block (44) has a stable restoring force within a preset deformation range. One end of the connecting block (44) along the length direction is connected to the movable plate (2), and the other end of the connecting block (44) along the length direction is connected to the support part (12).

10. The testing apparatus according to any one of claims 1-7, characterized in that, The force-applying component (4) includes a constant force spring (41), one end of which is connected to the base (1), and the other end of which is connected to the movable plate (2).

11. The testing apparatus according to any one of claims 1-7, characterized in that, The force-applying component (4) includes a pressure regulating valve and a drive cylinder (42). The drive cylinder (42) includes a cylinder body (421) and a piston rod (422). One of the cylinder body (421) and the piston rod (422) is connected to the base (1), and the other is connected to the piston rod (422). The pressure regulating valve is used to adjust the pressure in the cylinder body (421) to a constant preset pressure.

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